10-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

Annual report pursuant to Section 13 or 15(d) of the

Securities Exchange Act of 1934 for the fiscal year ended December 31, 2016

Commission File Number 001-15811

MARKEL CORPORATION

(Exact name of registrant as specified in its charter)

A Virginia Corporation

IRS Employer Identification No. 54-1959284

4521 Highwoods Parkway, Glen Allen, Virginia 23060-6148

(Address of principal executive offices) (Zip code)

Registrant's telephone number, including area code: (804) 747-0136

Securities registered pursuant to Section 12(b) of the Act:

Common Stock, no par value

New York Stock Exchange, Inc.

(title of each class and name of the exchange on which registered)

Securities registered pursuant to Section 12(g) of the Act: None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    Yes  x    No  ¨

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.    Yes  ¨    No  x

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  x    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Website, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  x    No  ¨

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrant's knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting company. See the definitions of "large accelerated filer," "accelerated filer" and "smaller reporting company" in Rule 12b-2 of the Exchange Act.

Large accelerated filer  x        Accelerated filer  ¨        Non-accelerated filer  ¨        Smaller reporting company  ¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).    Yes  ¨    No  x

The aggregate market value of the shares of the registrant's Common Stock held by non-affiliates as of June 30, 2016 was approximately $12,978,000,000.

The number of shares of the registrant's Common Stock outstanding at February 6, 2017: 13,955,617.

Documents Incorporated By Reference

The portions of the registrant's Proxy Statement for the Annual Meeting of Shareholders scheduled to be held on May 15, 2017, referred to in Part III.

Index and Cross References-Form 10-K Annual Report

Item No.				Page
Part I
1.	Business			2-30, 138-140
1A.	Risk Factors			24-30
1B.	Unresolved Staff Comments			NONE
2.	Properties (note 6 and note 16)			57, 80
3.	Legal Proceedings (note 16)			80
4.	Mine Safety Disclosures			NONE
Part II
5.	Market for Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities			95, 138-140
6.	Selected Financial Data			31-32
7.	Management's Discussion and Analysis of Financial Condition and Results of Operations			96-137
7A.	Quantitative and Qualitative Disclosures About Market Risk			130-132
8.	Financial Statements and Supplementary Data The response to this item is submitted in Item 15.
9.	Changes in and Disagreements With Accountants on Accounting and Financial Disclosure			NONE
9A.	Controls and Procedures			33-34, 135
9B.	Other Information			NONE
Part III
10.	Directors, Executive Officers and Corporate Governance*			141
	Code of Conduct			139
11.	Executive Compensation*
12.	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters*
13.	Certain Relationships and Related Transactions, and Director Independence*
14.	Principal Accounting Fees and Services*
*Portions of Item 10 and Items 11, 12, 13 and 14 will be incorporated by reference from the Registrant's Proxy Statement for its 2017 Annual Meeting of Shareholders pursuant to instructions G(1) and G(3) of the General Instructions to Form 10-K.
Part IV
15.	Exhibits, Financial Statement Schedules
	a.	Documents filed as part of this Form 10-K
		(1)	Reports of Independent Registered Public Accounting Firm	34-35
			Financial Statements
			Consolidated Balance Sheets	36
			Consolidated Statements of Income and Comprehensive Income	37
			Consolidated Statements of Changes in Equity	38
			Consolidated Statements of Cash Flows	39
			Notes to Consolidated Financial Statements	40-95
		(2)	Schedules have been omitted since they either are not required or are not applicable, or the information called for is shown in the Consolidated Financial Statements and Notes thereto.
		(3)	See Index to Exhibits for a list of Exhibits filed as part of this report
	b.	See Index to Exhibits and Item 15a(3)
	c.	See Index to Financial Statements and Item 15a(2)

BUSINESS OVERVIEW

We are a diverse financial holding company serving a variety of niche markets. Our principal business markets and underwrites specialty insurance products. We believe that our specialty product focus and niche market strategy enable us to develop expertise and specialized market knowledge. We seek to differentiate ourselves from competitors by our expertise, service, continuity and other value-based considerations. We also own interests in various industrial and service businesses that operate outside of the specialty insurance marketplace. Our financial goals are to earn consistent underwriting and operating profits and superior investment returns to build shareholder value.

Specialty Insurance and Reinsurance

The specialty insurance market differs significantly from the standard market. In the standard market, insurance rates and forms are highly regulated, products and coverages are largely uniform with relatively predictable exposures and companies tend to compete for customers on the basis of price. In contrast, the specialty market provides coverage for hard-to-place risks that generally do not fit the underwriting criteria of standard carriers.

Competition in the specialty insurance market tends to focus less on price than in the standard insurance market and more on other value-based considerations, such as availability, service and expertise. While specialty market exposures may have higher perceived insurance risks than their standard market counterparts, we seek to manage these risks to achieve higher financial returns. To reach our financial and operational goals, we must have extensive knowledge and expertise in our chosen markets. Many of our accounts are considered on an individual basis where customized forms and tailored solutions are employed.

By focusing on the distinctive risk characteristics of our insureds, we have been able to identify a variety of niche markets where we can add value with our specialty product offerings. Examples of niche insurance markets that we have targeted include wind and earthquake-exposed commercial properties, liability coverage for highly specialized professionals, equine-related risks, workers' compensation insurance for small businesses, classic cars and marine, energy and environmental-related activities. Our market strategy in each of these areas of specialization is tailored to the unique nature of the loss exposure, coverage and services required by insureds. In each of our niche markets, we assign teams of experienced underwriters and claims specialists who provide a full range of insurance services.

We also participate in the reinsurance market in certain classes of reinsurance product offerings. In the reinsurance market, our clients are other insurance companies, or cedents. We typically write our reinsurance products in the form of treaty reinsurance contracts, which are contractual arrangements that provide for automatic reinsuring of a type or category of risk underwritten by cedents. Generally, we participate on reinsurance treaties with a number of other reinsurers, each with an allocated portion of the treaty, with the terms and conditions of the treaty being substantially the same for each participating reinsurer. With treaty reinsurance contracts, we do not separately evaluate each of the individual risks assumed under the contracts and are largely dependent on the individual underwriting decisions made by the cedent. Accordingly, we review and analyze the cedent's risk management and underwriting practices in deciding whether to provide treaty reinsurance and in pricing of treaty reinsurance contracts.

Our reinsurance products are written on both a quota share and excess of loss basis. Quota share contracts require us to share the losses and expenses in an agreed proportion with the cedent. Excess of loss contracts require us to indemnify the cedent against all or a specified portion of losses and expenses in excess of a specified dollar or percentage amount. In both types of contracts, we may provide a ceding commission to the cedent.

We distinguish ourselves in the reinsurance market by the expertise of our underwriting teams, our access to global reinsurance markets, our ability to offer large lines and our ability to customize reinsurance solutions to fit our client's needs. Our specialty reinsurance product offerings include coverage for general casualty, professional liability, property, workers' compensation and credit and surety risks.

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Markets

In the United States, we write business in the excess and surplus lines (E&S) and specialty admitted insurance and reinsurance markets. In 2015, the E&S market represented approximately $41 billion, or 7%, of the approximately $591 billion United States property and casualty industry.⁽¹⁾ In 2015, we were the sixth largest E&S writer in the United States as measured by direct premium writings.⁽¹⁾  

Our E&S insurance operations are conducted through Evanston Insurance Company (Evanston), domiciled in Illinois. Previously, our E&S insurance operations were also conducted through Essex Insurance Company and Alterra Excess & Surplus Insurance Company, which were merged into Evanston effective June 30, 2016 and December 31, 2015, respectively. The majority of our specialty admitted insurance operations are conducted through Markel Insurance Company (MIC), domiciled in Illinois; Markel American Insurance Company (MAIC), domiciled in Virginia; FirstComp Insurance Company (FCIC), domiciled in Nebraska; Essentia Insurance Company (Essentia), domiciled in Missouri; and Alterra America Insurance Company (AAIC), domiciled in Delaware. Our United States reinsurance operations are conducted through Markel Global Reinsurance Company (Markel Global Re), a Delaware-domiciled reinsurance company.

In Europe, we participate in the London insurance market through Markel Capital Limited (Markel Capital) and Markel International Insurance Company Limited (MIICL). Markel Capital is the corporate capital provider for Markel Syndicate 3000, through which our Lloyd's of London (Lloyd's) operations are conducted. Markel Syndicate 3000 is managed by Markel Syndicate Management Limited (MSM). Markel Capital and MIICL are headquartered in London, England and have offices across the United Kingdom, Europe, Canada, Latin America, Asia Pacific and the Middle East through which we are able to offer insurance and reinsurance. The London insurance market produced approximately $64 billion of gross written premium in 2015.⁽²⁾ In 2015, the United Kingdom non-life insurance market was the second largest in Europe and fifth largest in the world.⁽³⁾ In 2015, gross premium written through Lloyd's syndicates generated roughly 64% of the London market's international insurance business,⁽²⁾ making Lloyd's the world's largest commercial surplus lines insurer⁽¹⁾ and fifth largest reinsurer.⁽⁴⁾ Corporate capital providers often provide a majority of a syndicate's capacity and also generally own or control the syndicate's managing agent. This structure permits the capital provider to exert greater influence on, and demand greater accountability for, underwriting results. In 2015, corporate capital providers accounted for approximately 90% of total underwriting capacity in Lloyd's.⁽⁵⁾  

In Latin America, we provide reinsurance through MIICL, using our representative office in Bogota, Colombia, and our service company in Buenos Aires, Argentina; through Markel Resseguradora do Brasil S.A. (Markel Brazil), our reinsurance company in Rio de Janeiro, Brazil; and through Markel Syndicate 3000, using Lloyd's admitted status in Rio de Janeiro. Additionally, MIICL and Markel Syndicate 3000 are able to offer reinsurance in a number of Latin American countries through offices outside of Latin America.

In Bermuda, we write business in the worldwide insurance and reinsurance markets. The Bermuda property and casualty insurance and reinsurance market produced approximately $72 billion of gross written premium in 2014.⁽⁶⁾ We conduct our Bermuda operations through Markel Bermuda Limited (Markel Bermuda), which is registered as a Class 4 insurer and Class C long-term insurer under the insurance laws of Bermuda.

Our reinsurance operations, which include our operations based in the United States, the United Kingdom, Latin America and Bermuda, as described above, made us the 38th largest reinsurer in 2015, as measured by worldwide gross reinsurance premium writings.⁽⁴⁾  

(1) U.S. Surplus Lines Segment Review Special Report, A.M. Best (September 19, 2016).

(2)London Company Market Statistics Report, International Underwriting Association (October 2016).

(3)Swiss Re Sigma (March 2016).

(4)Global Reinsurance Segment Review Special Report, A.M. Best (September 5, 2016).

(5)Lloyd's Annual Report 2015.

(6) Bermuda Monetary Authority 2015 Annual Report.

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In 2016, 23% of consolidated gross premium writings related to foreign risks (i.e., coverage for risks or cedents located outside of the United States), of which 32% were from the United Kingdom and 11% were from Canada. In 2015, 24% of our premium writings related to foreign risks, of which 37% were from the United Kingdom and 10% were from Canada. In 2014, 27% of our premium writings related to foreign risks, of which 34% were from the United Kingdom and 10% were from Canada. In each of these years, there was no other individual foreign country from which premium writings were material. Premium writings are attributed to individual countries based upon location of risk or cedent.

Most of our business is placed through insurance and reinsurance brokers. Some of our insurance business is also placed through managing general agents. We seek to develop and capitalize on relationships with insurance and reinsurance brokers, insurance and reinsurance companies, large global corporations and financial intermediaries to develop and underwrite business. A significant volume of premium for the property and casualty insurance and reinsurance industry is produced through a small number of large insurance and reinsurance brokers. During the years ended December 31, 2016, 2015 and 2014, the top three independent brokers accounted for approximately 28%, 27% and 28%, respectively, of our gross premiums written.

Competition

We compete with numerous domestic and international insurance companies and reinsurers, Lloyd's syndicates, risk retention groups, insurance buying groups, risk securitization programs and alternative self-insurance mechanisms. We also compete with new companies that continue to be formed to enter the insurance and reinsurance markets, particularly companies with new or "disruptive" technologies or business models. Competition may take the form of lower prices, broader coverages, greater product flexibility, higher coverage limits, higher quality services or higher ratings by independent rating agencies. In all of our markets, we compete by developing specialty products to satisfy well-defined market needs and by maintaining relationships with agents, brokers and insureds who rely on our expertise. This expertise is our principal means of competing. We offer a diverse portfolio of products, each with its own distinct competitive environment, which enables us to be responsive to changes in market conditions for individual product lines. With each of our products, we seek to compete with innovative ideas, appropriate pricing, expense control and quality service to policyholders, agents and brokers.

Few barriers exist to prevent insurers and reinsurers from entering our markets of the property and casualty industry. Market conditions and capital capacity influence the degree of competition at any point in time. Periods of intense competition, which typically include broader coverage terms, lower prices and excess underwriting capacity, are referred to as a "soft market." A favorable insurance market is commonly referred to as a "hard market" and is characterized by stricter coverage terms, higher prices and lower underwriting capacity. During soft markets, unfavorable conditions exist due in part to what many perceive as excessive amounts of capital in the industry. In an attempt to use their capital, many insurance companies seek to write additional premiums without appropriate regard for ultimate profitability, and standard insurance companies are more willing to write specialty coverages. The opposite is typically true during hard markets. Historically, the performance of the property and casualty reinsurance and insurance industries has tended to fluctuate in cyclical periods of price competition and excess underwriting capacity, followed by periods of high premium rates and shortages of underwriting capacity. This cyclical market pattern can be more pronounced in the specialty insurance and reinsurance markets in which we compete than the standard insurance market.

We experienced soft insurance market conditions, including price deterioration in virtually all of our product lines, starting in the mid-2000s. Beginning in 2012, prices stabilized and we generally saw low to mid-single digit favorable rate changes in many of our product lines in the following years as market conditions improved and revenues, gross receipts and payrolls of our insureds were favorably impacted by improving economic conditions. However, beginning in 2013 and continuing through 2016, we have experienced softening prices across most of our property product lines, as well as on our marine and energy lines. Our large account business is also subject to more pricing pressure. Competition remains strong in the reinsurance market, however the rate of price decline has slowed and in a few cases stabilized. We continue to see pricing margins in most reinsurance lines of business. Despite stabilization of prices on certain product lines during the last several years, we still consider the overall property and casualty insurance market to be soft. We routinely review the pricing of our major product lines and will continue to pursue price increases in 2017, when possible. However, when we believe the prevailing market price will not support our underwriting profit targets, the business is not written. As a result of our underwriting discipline, gross premium volume may vary when we alter our product offerings to maintain or improve underwriting profitability.

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Underwriting Philosophy

By focusing on market niches where we have underwriting expertise, we seek to earn consistent underwriting profits, which are a key component of our strategy. The property and casualty insurance industry commonly defines underwriting profit or loss as earned premiums net of losses and loss adjustment expenses and underwriting, acquisition and insurance expenses. We believe that the ability to achieve consistent underwriting profits demonstrates knowledge and expertise, commitment to superior customer service and the ability to manage insurance risk. We use underwriting profit or loss as a basis for evaluating our underwriting performance. To facilitate this strategy, we have a product line leadership group that has primary responsibility for both developing and maintaining underwriting and pricing guidelines on our existing products and new product development. The product line leadership group is under the direction of our Chief Underwriting Officer.

The combined ratio is a measure of underwriting performance and represents the relationship of incurred losses, loss adjustment expenses and underwriting, acquisition and insurance expenses to earned premiums. A combined ratio less than 100% indicates an underwriting profit, while a combined ratio greater than 100% reflects an underwriting loss. In 2016, our combined ratio was 92%. See Management's Discussion & Analysis of Financial Condition and Results of Operations for further discussion of our underwriting results.

The following graph compares our combined ratio to the property and casualty industry's combined ratio for the past five years.

Underwriting Segments

We monitor and report our ongoing underwriting operations in the following three segments: U.S. Insurance, International Insurance and Reinsurance. In determining how to aggregate and monitor our underwriting results, management considers many factors, including the geographic location and regulatory environment of the insurance entity underwriting the risk, the nature of the insurance product sold, the type of account written and the type of customer served.

The U.S. Insurance segment includes all direct business and facultative placements written by our insurance subsidiaries domiciled in the United States. The International Insurance segment includes all direct business and facultative placements written by our insurance subsidiaries domiciled outside of the United States, including our syndicate at Lloyd's. The Reinsurance segment includes all treaty reinsurance written across the Company. Results for lines of business discontinued prior to, or in conjunction with, acquisitions are reported in the Other Insurance (Discontinued Lines) segment. The lines were discontinued because we believed some aspect of the product, such as risk profile or competitive environment, would not allow us to earn consistent underwriting profits. Results attributable to the run-off of life and annuity reinsurance business are included in our Other Insurance (Discontinued Lines) segment.

See note 20 of the notes to consolidated financial statements for additional segment reporting disclosures.

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Markel Corporation

2016 Consolidated Gross Premium Volume ($4.8 billion)

U.S. Insurance Segment

Our U.S. Insurance segment includes both hard-to-place risks written outside of the standard market on an excess and surplus lines basis and unique and hard-to-place risks that must be written on an admitted basis due to marketing and regulatory reasons. Business in this segment is written through our Wholesale, Specialty and Global Insurance divisions.

Wholesale Division

The Wholesale division writes commercial risks, primarily on an excess and surplus lines basis. The E&S market focuses on hard-to-place risks and loss exposures that generally cannot be written in the standard market. United States insurance regulations generally require an E&S account to be declined by admitted carriers before an E&S company may write the business. E&S eligibility allows our insurance subsidiaries to underwrite unique loss exposures with more flexible policy forms and unregulated premium rates. This typically results in coverages that are more restrictive and more expensive than coverages in the standard market.

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Our E&S business is written through two distribution channels: professional surplus lines general agents who have limited quoting and binding authority and wholesale brokers. Our E&S business produced by this segment is written on a surplus lines basis through Evanston, which is authorized to write business in all 50 states and the District of Columbia, Guam, Puerto Rico and the U.S. Virgin Islands.

Specialty Division

The Specialty division writes program insurance and other specialty coverages for well-defined niche markets, primarily on an admitted basis. Our business written in the admitted market focuses on risks that, although unique and hard-to-place in the standard market, must remain with an admitted insurance company for marketing and regulatory reasons. Hard-to-place risks written in the admitted market cover insureds engaged in similar, but highly specialized activities who require a total insurance program not otherwise available from standard insurers or insurance products that are overlooked by large admitted carriers. The admitted market is subject to more state regulation than the E&S market, particularly with regard to rate and form filing requirements, restrictions on the ability to exit lines of business, premium tax payments and membership in various state associations, such as state guaranty funds and assigned risk plans.

The majority of our business written in the Specialty division is written by retail insurance agents who have very limited or no underwriting authority. Agents are carefully selected and agency business is controlled through regular audits and pre- approvals. Certain products and programs are marketed directly to consumers or distributed through wholesale producers. Personal lines coverages included in this segment are marketed directly to the consumer using direct mail, internet and telephone promotions, as well as relationships with various motorcycle and boat manufacturers, dealers and associations.

The majority of the business produced by this division is written either through MIC, MAIC, FCIC or Essentia. MIC, MAIC and Essentia are licensed to write property and casualty insurance in all 50 states and the District of Columbia. MAIC is also licensed to write property and casualty insurance in Puerto Rico. Essentia specializes in coverage for classic cars and boats. FCIC is currently licensed in 28 states and specializes in workers' compensation coverage.

Global Insurance Division

The Global Insurance division writes risks outside of the standard market on both an admitted and non-admitted basis. The portion of Global Insurance division business written by our U.S. insurance subsidiaries is included in this segment, and the remainder is included in the International Insurance segment. U.S. business produced by this division is primarily written on Evanston, MAIC or AAIC. AAIC is licensed to write property and casualty insurance in all 50 states and the District of Columbia.

Our U.S. Insurance segment reported gross premium volume of $2.6 billion, earned premiums of $2.2 billion and an underwriting profit of $152.7 million in 2016.

U.S. Insurance Segment

2016 Gross Premium Volume ($2.6 billion)

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Product offerings within the U.S. Insurance segment fall within the following major product groupings:

• General Liability

• Professional Liability

• Property

• Personal Lines

• Programs

• Workers' Compensation

• Other Product Lines

General Liability product offerings include a variety of primary and excess liability coverages targeting apartments and office buildings, retail stores and contractors, as well as business in the life sciences, energy, medical, recreational and hospitality industries. Specific products include the following:

• excess and umbrella products, which provide coverage over approved underlying insurance carriers on either an occurrence or claims-made basis;

• products liability products, which provide coverage on either an occurrence or claims-made basis to manufacturers, distributors, importers and re-packagers of manufactured products;

• environmental products, which include environmental consultants' professional liability, contractors' pollution liability and site-specific environmental impairment liability coverages; and

• casualty facultative reinsurance written for individual casualty risks focusing on general liability, products liability, automobile liability and certain classes of miscellaneous professional liability and targeting classes which include low frequency, high severity general liability risks.

Professional liability coverages include unique solutions for highly specialized professions, including architects and engineers, lawyers, agents and brokers, service technicians and computer consultants. We offer claims-made medical malpractice coverage for doctors and dentists; claims-made professional liability coverage to individual healthcare providers such as therapists, pharmacists, physician assistants and nurse anesthetists; and coverages for medical facilities and other allied healthcare risks such as clinics, laboratories, medical spas, home health agencies, small hospitals, pharmacies and senior living facilities. Other professional liability coverages include errors and omissions, union liability, executive liability for financial institutions and Fortune 1000 companies, and management liability. Our management liability coverages, which can be bundled with other coverages or written on a standalone basis, include employment practices liability, directors' and officers' liability and fiduciary liability coverages. Additionally, we offer cyber liability products, which provide coverage for data breach and privacy liability, data breach loss to insureds and electronic media coverage.

Property coverages consist principally of fire, allied lines (including windstorm, hail and water damage) and other specialized property coverages, including catastrophe-exposed property risks such as earthquake and wind on both a primary and excess basis. Catastrophe-exposed property risks are typically larger and are lower frequency and higher severity in nature than more standard property risks. Our property risks range from small, single-location accounts to large, multi-state, multi-location accounts. Other types of property products include:

• inland marine products, which provide a number of specialty coverages for risks such as motor truck cargo coverage for damage to third party cargo while in transit, warehouseman's legal liability coverage for damage to third party goods in storage, contractor's equipment coverage for first party property damage, and builder's risk coverage; and

• railroad-related products, which provide first party coverages for short-line and regional railroads, scenic and tourist railroads, commuter and light rail trains and railroad equipment.

Personal lines products provide first and third party coverages for classic cars, motorcycles and a variety of personal watercraft, including vintage boats, high performance boats and yachts and recreational vehicles, such as motorcycles, snowmobiles and ATVs. Based on the seasonal nature of much of our personal lines business, we generally will experience higher claims activity during the second and third quarters of the year. Additionally, property coverages are offered for mobile homes, dwellings and homeowners that do not qualify for standard homeowner's coverage. Other products offered include special event protection, tuition refund protection, performance bicycle coverage, pet health coverage, supplemental natural disaster coverage, renters' protection coverage and excess flood coverage.

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Program business included in this segment is offered on a standalone or package basis and generally targets specialized commercial markets and customer groups. Targeted groups include youth and recreation oriented organizations and camps, child care operators, schools, social service organizations, museums and historic homes, performing arts organizations, senior living facilities and wineries. Other program business written in this segment includes:

• general agent programs that use managing general agents to offer single source admitted and non-admitted programs for a specific class or line of business;

• first and third party coverages for medical transport, small fishing ventures, charters, utility boats and boat rentals; and

• property and liability coverages for farms and animal boarding, breeding and training facilities.

Workers' compensation products provide wage replacement and medical benefits to employees injured in the course of employment and target main-street, service and artisan contractor businesses, retail stores and restaurants.

Other product lines within the U.S. Insurance segment include:

• ocean marine products, which provide general liability, professional liability, property and cargo coverages for marine artisan contractors, boat dealers and marina owners including hull physical damage, protection and indemnity and third party property coverages for ocean cargo; and

• coverages for equine-related risks, such as horse mortality, theft, infertility, transit and specified perils.

International Insurance Segment

Our International Insurance segment writes risks that are characterized by either the unique nature of the exposure or the high limits of insurance coverage required by the insured. Business included in this segment is produced through our Markel International and Global Insurance divisions.

Markel International Division

The Markel International division writes business worldwide from our London-based platform and branch offices around the world. This platform includes Markel Syndicate 3000, through which our Lloyd's operations are conducted, and MIICL. The London insurance market is known for its ability to provide innovative, tailored coverage and capacity for unique and hard-to-place risks. Hard-to-place risks in the London market are generally distinguishable from standard risks due to the complexity or significant size of the risk. It is primarily a broker market, which means that insurance brokers bring most of the business to the market. Risks written in the Markel International division are written on either a direct basis or a subscription basis, the latter of which means that loss exposures brought into the market are typically insured by more than one insurance company or Lloyd's syndicate, often due to the high limits of insurance coverage required. When we write business in the subscription market, we prefer to participate as lead underwriter in order to control underwriting terms, policy conditions and claims handling.

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Global Insurance Division

Global Insurance division business written by our non-U.S. insurance subsidiaries, which primarily targets Fortune 1000 accounts, is included in the International Insurance segment. The Global Insurance division is comprised of business written through Markel Bermuda and MIICL.

In 2016, 64% of gross premium written in the International Insurance segment related to foreign risks, of which 36% was from the United Kingdom and 16% was from Canada. In 2015, 66% of gross premium written in the International Insurance segment related to foreign risks, of which 40% was from the United Kingdom and 13% was from Canada. In 2014, 67% of gross premium written in the International Insurance segment related to foreign risks, of which 37% was from the United Kingdom and 14% was from Canada. In each of these years, there was no other individual foreign country from which premium writings were material.

Our International Insurance segment reported gross premium volume of $1.1 billion, earned premiums of $853.5 million and an underwriting profit of $47.2 million in 2016.

International Insurance Segment

2016 Gross Premium Volume ($1.1 billion)

Product offerings within the International segment fall within the following major product groupings:

• Professional Liability

• Marine and Energy

• General Liability

• Property

• Other Product Lines

Professional liability products are written on a worldwide basis and include professional indemnity, directors' and officers' liability, errors and omissions, employment practices liability, intellectual property and cyber liability. Our target industries include U.S. and international public companies, as well as large professional firms, including lawyers, financial institutions, accountants, consultants, and architects and engineers.

Marine and energy products include a portfolio of coverages for cargo, energy, hull, liability, war and terrorism risks. The cargo account is an international transit-based book covering many types of cargo. Energy coverage includes all aspects of oil and gas activities. The hull account covers physical damage to ocean-going tonnage, yachts and mortgagees' interests. Liability coverage provides for a broad range of energy liabilities, as well as traditional marine exposures including charterers, terminal operators and ship repairers. The war account covers the hulls of ships and aircraft, and other related interests, against war and associated perils. Terrorism coverage provides for property damage and business interruption related to political violence including war and civil war.

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General liability products are written on a worldwide basis and include general and products liability coverages targeting consultants, construction professionals, financial service professionals, professional practices, social welfare organizations and medical products. We also write excess liability coverage, which includes excess product liability, excess medical malpractice and excess product recall insurance in the following industries: healthcare, pharmaceutical, medical products, life sciences, transportation, heavy industrial and energy. 

Property products target a wide range of insureds, providing coverage ranging from specie risks and fire to catastrophe perils such as earthquake and windstorm. Business is written primarily on an open market basis for direct and facultative risks targeting Fortune 1000 and large, multi-national companies on a worldwide basis. We also provide property coverage for small to medium-sized commercial risks on both a stand-alone and package basis. The specie account includes coverage for fine art on exhibition and in private collections, securities, bullion, precious metals, cash in transit and jewelry.

Other product lines within the International Insurance segment include:

• crime coverage primarily targeting financial institutions and providing protection for bankers' blanket bond, computer crime and commercial fidelity;

• contingency coverage including event cancellation, non-appearance and prize indemnity;

• accident and health coverage targeting affinity groups and schemes, high value and high risks accounts and sports groups;

• coverage for equine-related risks such as horse mortality, theft, infertility, transit and specified perils;

• coverage for legal expenses including before the event products that protect commercial clients in the event of legal actions and after the event products covering a wide range of litigation;

• specialty coverages include mortality risks for farms, zoos, animal theme parks and safari parks; and

• short-term trade credit coverage for commercial risks, including insolvency and protracted default as well as political risks coverage in conjunction with commercial risks for currency inconvertibility, government action, import and export license cancellation, public buyer default and war.

Reinsurance Segment

Our Reinsurance segment includes property and casualty treaty reinsurance products offered to other insurance and reinsurance companies globally through the broker market. Our treaty reinsurance offerings include both quota share and excess of loss reinsurance and are typically written on a participation basis, which means each reinsurer shares proportionally in the business ceded under the reinsurance treaty written. Our reinsurance products may include features such as contractual provisions that require our cedent to share in a portion of losses resulting from ceded risks, may require payment of additional premium amounts if we incur greater losses than those projected at the time of the execution of the contract, may require reinstatement premium to restore the coverage after there has been a loss occurrence or may provide for experience refunds if the losses we incur are less than those projected at the time the contract is executed. Our reinsurance product offerings are underwritten by our Global Reinsurance division and our Markel International division. The Global Reinsurance division operates from platforms in the United States and Bermuda. Business written in the Global Reinsurance division is produced through Markel Global Re and Markel Bermuda. Markel Global Re is licensed or accredited to provide reinsurance in all 50 states and the District of Columbia. Markel Bermuda conducts its reinsurance operations from Bermuda. The Markel International division conducts its reinsurance operations from its London-based platform, as described above, and from its platform in Latin America, which includes Markel Brazil.

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In 2016, 37% of gross premium written in the Reinsurance segment related to foreign risks, of which 25% was from the United Kingdom. In 2015, 36% of gross premium written in the Reinsurance segment related to foreign risks, of which 32% was from the United Kingdom. In 2014, 43% of gross premium written in the Reinsurance segment related to foreign risks, of which 31% was from the United Kingdom. In each of these years, there was no other individual foreign country from which premium writings were material.

Our Reinsurance segment reported gross premium volume of $1.0 billion, earned premiums of $836.3 million and an underwriting profit of $106.8 million in 2016.

Reinsurance Segment

2016 Gross Premium Volume ($1.0 billion)

Product offerings within the Reinsurance segment fall within the following major product groupings:

• Property

• Casualty

• Other

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Property treaty products are offered on an excess of loss and quota share basis for catastrophe, per risk and retrocessional exposures worldwide. Our catastrophe exposures are generally written on an excess of loss basis and target both personal and commercial lines of business providing coverage for losses from natural disasters, including hurricanes, wind storms and earthquakes. We also reinsure individual property risks such as buildings, structures, equipment and contents and provide coverage for both personal lines and commercial property exposures. Our retrocessional products provide coverage for all types of underlying exposures and geographic zones. A significant portion of the property treaty business covers United States exposures, with the remainder coming from international property exposures.

Our casualty treaty reinsurance programs are written on a quota share and excess of loss basis and include general liability, professional liability, workers' compensation, medical malpractice, environmental impairment liability and auto liability. General liability reinsurance includes umbrella and excess casualty products that are written worldwide. Our professional liability reinsurance programs are offered worldwide and consist of directors and officers liability, including publicly traded, private, and non-profit companies in both commercial and financial institution arenas; lawyers errors and omissions for small, medium and large-sized law firms; accountants errors and omissions for small and medium-sized firms; technology errors and omissions and cyber liability focusing on network security and privacy exposures. Auto reinsurance treaty products include commercial and non standard personal auto exposures predominantly in the United States. Our workers' compensation business includes catastrophe-exposed workers' compensation business. Medical malpractice reinsurance products are offered in the United States and include quota share, excess of loss and stop loss coverage for physician and surgeon medical malpractice specialty writers, member-owned hospital writers focusing on small-to-medium size facilities, national hospital writers focused on primary or lower excess layers on medium size facilities and long-term care writers focused on privately held, religious based or state sponsored non-profit programs. Environmental treaty reinsurance provides coverage for pollution legal liability, contractors pollution and professional liability exposures on both a nationwide and regional basis within the United States.

Other treaty reinsurance products offered in the Reinsurance segment include:

• structured and whole turnover credit, political risk, mortgage and contract and commercial surety reinsurance programs covering worldwide exposures;

• public entity reinsurance products, which offer customized programs for government risk solutions, including counties, municipalities, schools, public housing authorities and special districts (e.g. water, sewer, parks) located in the United States. Types of coverage include general liability, environmental impairment liability, workers' compensation and errors and omissions;

• aviation, which includes commercial airline hull and liability coverage as well as general aviation for risks worldwide;

• accident and health catastrophe coverage for personal accident, life, medical and workers' compensation;

• onshore and offshore marine and energy risks on a worldwide basis, including hull, cargo and liability; and

• agriculture reinsurance for Multi-Peril Crop Insurance, hail and related exposures, covering risks located in the United States and Canada.

Ceded Reinsurance

We purchase reinsurance and retrocessional reinsurance to manage our net retention on individual risks and overall exposure to losses, while providing us with the ability to offer policies with sufficient limits to meet policyholder needs. In reinsurance and retrocession transactions, an insurance or reinsurance company transfers, or cedes, all or part of its exposure in return for a portion of the premium. We purchase catastrophe reinsurance coverage for our catastrophe-exposed policies to ensure that our net retained catastrophe risk is within our corporate tolerances. Net retention of gross premium volume was 83% in 2016 and 82% in 2015. We do not purchase or sell finite reinsurance products or use other structures that would have the effect of discounting loss reserves.

Our ceded reinsurance and retrocessional contracts do not legally discharge us from our primary liability for the full amount of the policies, and we will be required to pay the loss and bear collection risk if the reinsurer fails to meet its obligations under the reinsurance agreement. We attempt to minimize credit exposure to reinsurers through adherence to internal ceded reinsurance guidelines. We manage our exposures so that no exposure to any one reinsurer is material to our ongoing business. To participate in our reinsurance program, prospective companies generally must: (i) maintain an A.M. Best Company (Best) or Standard & Poor's (S&P) rating of "A" (excellent) or better; (ii) maintain minimum capital and surplus of $500 million and (iii) provide collateral for recoverables in excess of an individually established amount. In addition, certain foreign reinsurers for our United States insurance operations must provide collateral equal to 100% of recoverables, with the exception of reinsurers who have been granted authorized status by an insurance company's state of domicile. Our credit exposure to Lloyd's syndicates is managed through individual and aggregate exposure thresholds.

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When appropriate, we pursue reinsurance commutations that involve the termination of ceded reinsurance and retrocessional contracts. Our commutation strategy related to ceded reinsurance and retrocessional contracts is to reduce credit exposure and eliminate administrative expenses associated with the run-off of ceded reinsurance placed with certain reinsurers.

The following table displays balances recoverable from our ten largest reinsurers by group at December 31, 2016. The contractual obligations under reinsurance and retrocessional contracts are typically with individual subsidiaries of the group or syndicates at Lloyd's and are not typically guaranteed by other group members or syndicates at Lloyd's. These ten reinsurance groups represent approximately 67% of our $2.1 billion reinsurance recoverable balance before considering allowances for bad debts.

Reinsurers	A.M. Best Rating	Reinsurance Recoverable
		(dollars in thousands)
Fairfax Financial Group	A	$	318,505
Munich Re Group	A+	194,079
AXIS Capital Holdings Limited	A+	163,142
Alleghany Corporation	A+	147,938
RenaissanceRe Holdings Ltd	A	130,748
Lloyd's of London	A	116,256
EXOR S.p.A	A	112,765
Swiss Re Group	A+	93,075
XL Capital Group	A	69,580
Tokio Marine Holdings	A++	64,242
Reinsurance recoverable on paid and unpaid losses for ten largest reinsurers		1,410,330
Total reinsurance recoverable on paid and unpaid losses		$	2,108,607

Reinsurance recoverable balances in the preceding table are shown before consideration of balances owed to reinsurers and any potential rights of offset, any collateral held by us and allowances for bad debts.

Reinsurance and retrocessional treaties are generally purchased on an annual or biennial basis and are subject to renegotiations at renewal. In most circumstances, the reinsurer remains responsible for all business produced before termination. Treaties typically contain provisions concerning ceding commissions, required reports to reinsurers, responsibility for taxes, arbitration in the event of a dispute and provisions that allow us to demand that a reinsurer post letters of credit or assets as security if a reinsurer becomes an unauthorized reinsurer under applicable regulations or if its rating falls below an acceptable level.

See note 15 of the notes to consolidated financial statements and Management's Discussion & Analysis of Financial Condition and Results of Operations for additional information about our ceded reinsurance programs and exposures.

Investments

Our business strategy recognizes the importance of both consistent underwriting and operating profits and superior investment returns to build shareholder value. We rely on sound underwriting practices to produce investable funds while minimizing underwriting risk. The majority of our investable assets come from premiums paid by policyholders. Policyholder funds are invested predominantly in high-quality corporate, government and municipal bonds with relatively short durations. The balance, comprised of shareholder funds, is available to be invested in equity securities, which over the long run, have produced higher returns relative to fixed maturity investments. When purchasing equity securities, we seek to invest in profitable companies, with honest and talented management, that exhibit reinvestment opportunities and capital discipline, at reasonable prices. We intend to hold these investments over the long term. Substantially all of our investment portfolio is managed by company employees.

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We evaluate our investment performance by analyzing net investment income and net realized gains (losses) as well as our taxable equivalent total investment return, which is a non-GAAP financial measure. Taxable equivalent total investment return includes items that impact net income, such as coupon interest on fixed maturities, dividends on equity securities and realized investment gains or losses, as well as changes in unrealized gains or losses, which do not impact net income. Certain items that are included in net investment income have been excluded from the calculation of taxable equivalent total investment return, such as amortization and accretion of premiums and discounts on our fixed maturity portfolio, to provide a comparable basis for measuring our investment return against industry investment returns. The calculation of taxable equivalent total investment return also includes the current tax benefit associated with income on certain investments that is either taxed at a lower rate than the statutory income tax rate or is not fully included in federal taxable income. We believe the taxable equivalent total investment return is a better reflection of the economics of our decision to invest in certain asset classes. We do not lower the quality of our investment portfolio in order to enhance or maintain yields. We focus on long-term total investment return, understanding that the level of realized and unrealized investment gains or losses may vary from one period to the next.

The following table summarizes our investment performance.

	Years Ended December 31,
(dollars in thousands)	2016			2015			2014			2013			2012
Net investment income	$	373,230		$	353,213		$	363,230		$	317,373		$	282,107
Net realized investment gains	$	65,147		$	106,480		$	46,000		$	63,152		$	31,593
Increase (decrease) in net unrealized gains on investments	$	342,111		$	(457,584	)	$	981,035		$	261,995		$	353,808
Investment yield (1)	2.4		%	2.3		%	2.4		%	2.6		%	3.7		%

⁽¹⁾  Investment yield reflects net investment income as a percentage of monthly average invested assets at amortized cost.

We believe our investment performance is best analyzed from the review of taxable equivalent total investment return over several years. The following table presents taxable equivalent total investment return before and after the effects of foreign currency movements.

Annual Taxable Equivalent Total Investment Returns

																Five-Year Annual Return		Ten-Year Annual Return
	Years Ended December 31,
	2016			2015			2014			2013			2012
Equities	13.5		%	(2.5		)%	18.6		%	33.3		%	19.6		%	15.9	%	8.0	%
Fixed maturities (1)	2.4		%	1.6		%	6.5		%	—		%	5.1		%	3.1	%	4.4	%
Total portfolio, before foreign currency effect	5.0		%	0.5		%	8.9		%	6.9		%	8.6		%	5.9	%	5.2	%
Total portfolio	4.4		%	(0.7		)%	7.4		%	6.8		%	9.0		%	5.3	%	4.8	%
Invested assets, end of year (in millions)	$	19,059		$	18,181		$	18,638		$	17,612		$	9,333

⁽¹⁾  Includes short-term investments, cash and cash equivalents and restricted cash and cash equivalents.

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The following table reconciles investment yield to taxable equivalent total investment return.

	Years Ended December 31,
	2016		2015		2014		2013		2012
Investment yield (1)	2.4	%	2.3	%	2.4	%	2.6	%	3.7	%
Adjustment of investment yield from amortized cost to fair value	(0.4	)%	(0.4	)%	(0.4	)%	(0.3	)%	(0.5	)%
Net amortization of net premium on fixed maturity securities	0.4	%	0.5	%	0.6	%	0.7	%	0.2	%
Net realized investment gains and change in net unrealized gains on investments	2.3	%	(2.0	)%	5.9	%	2.3	%	4.3	%
Taxable equivalent effect for interest and dividends (2)	0.4	%	0.4	%	0.4	%	0.4	%	0.6	%
Other (3)	(0.7	)%	(1.5	)%	(1.5	)%	1.1	%	0.7	%
Taxable equivalent total investment return	4.4	%	(0.7	)%	7.4	%	6.8	%	9.0	%

⁽¹⁾  Investment yield reflects net investment income as a percentage of monthly average invested assets at amortized cost.

⁽²⁾  Adjustment to tax-exempt interest and dividend income to reflect a taxable equivalent basis.

⁽³⁾  Adjustment to reflect the impact of changes in foreign currency exchange rates and time-weighting the inputs to the calculation of taxable equivalent total investment return.

We monitor our investment portfolio to ensure that credit risk does not exceed prudent levels. S&P and Moody's provide corporate and municipal debt ratings based on their assessments of the credit quality of an obligor with respect to a specific obligation. S&P's ratings range from "AAA" (capacity to pay interest and repay principal is extremely strong) to "D" (debt is in payment default). Securities with ratings of "BBB" or higher are referred to as investment grade securities. Debt rated "BB" and below is regarded by S&P as having predominantly speculative characteristics with respect to capacity to pay interest and repay principal. Moody's ratings range from "Aaa" to "C" with ratings of "Baa" or higher considered investment grade.

Our fixed maturity portfolio has an average rating of "AA," with approximately 98% rated "A" or better by at least one nationally recognized rating organization. Our policy is to invest in investment grade securities and to minimize investments in fixed maturities that are unrated or rated below investment grade. At December 31, 2016, less than 1% of our fixed maturity portfolio was unrated or rated below investment grade. Our fixed maturity portfolio includes securities issued with financial guaranty insurance. We purchase fixed maturities based on our assessment of the credit quality of the underlying assets without regard to insurance.

At December 31, 2016, we held fixed maturities of $38.0 million, or less than 1% of invested assets, from sovereign and non-sovereign issuers domiciled in Portugal, Ireland, Italy, Greece, Spain or Brazil and $1.5 billion, or 8% of invested assets, from sovereign and non-sovereign issuers domiciled in other European countries, including supranationals. At December 31, 2015, we held fixed maturities of $29.8 million, or less than 1% of invested assets, from sovereign and non-sovereign issuers domiciled in Portugal, Ireland, Italy, Greece, Spain or Brazil and $1.7 billion, or 9% of invested assets, from sovereign and non-sovereign issuers domiciled in other European countries, including supranationals.

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The following chart presents our fixed maturity portfolio, at estimated fair value, by rating category at December 31, 2016.

2016 Credit Quality of Fixed Maturity Portfolio ($9.9 billion)

See "Market Risk Disclosures" in Management's Discussion & Analysis of Financial Condition and Results of Operations for additional information about investments.

Markel Ventures

Through our wholly owned subsidiary Markel Ventures, Inc. (Markel Ventures), we own interests in various industrial and service businesses that operate outside of the specialty insurance marketplace. These businesses are viewed by management as separate and distinct from our insurance operations. Local management teams oversee the day-to-day operations of these companies, while strategic decisions are made in conjunction with members of our executive management team.

Our strategy in making these investments is similar to our strategy for purchasing equity securities. We seek to invest in profitable companies, with honest and talented management, that exhibit reinvestment opportunities and capital discipline, at reasonable prices. We intend to own the businesses acquired for a long period of time.

Our Markel Ventures operations are comprised of a diverse portfolio of businesses. While each of the businesses are operated independently from one another, we aggregate their financial results into two industry groups: manufacturing and non-manufacturing. Our manufacturing operations are comprised of manufacturers of transportation and other industrial equipment. Our non-manufacturing operations are comprised of businesses from several industry groups, including consumer goods and services (including healthcare) and business services.

In 2016, our Markel Ventures operations reported revenues of $1.2 billion, net income to shareholders of $56.2 million and earnings before interest, income taxes, depreciation and amortization (EBITDA) of $165.1 million. We use Markel Ventures EBITDA as an operating performance measure in conjunction with revenues and net income. See "Markel Ventures Operations" in Management's Discussion & Analysis of Financial Condition and Results of Operations for more information on EBITDA.

See note 21 of the notes to consolidated financial statements and Management's Discussion & Analysis of Financial Condition and Results of Operations for additional information about our Markel Ventures operations.

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Markel CATCo Investment Management

Our non-insurance operations also include our Markel CATCo operations, which are conducted through Markel CATCO Investment Management Ltd. (MCIM). MCIM is a leading insurance-linked securities investment fund manager and reinsurance manager headquartered in Bermuda focused on building and managing highly diversified, collateralized retrocession and reinsurance portfolios covering global property catastrophe risks. MCIM receives management fees for its investment and insurance management services, as well as performance fees based on the annual performance of the investment funds that it manages. Total revenues attributed to MCIM for the year ended December 31, 2016 were $56.5 million. As of December 31, 2016, MCIM's total investment and insurance assets under management were $3.6 billion, which includes $3.4 billion for unconsolidated variable interest entities.

Shareholder Value

Our financial goals are to earn consistent underwriting and operating profits and superior investment returns to build shareholder value. More specifically, we measure financial success by our ability to grow book value per share at a high rate of return over a long period of time. To mitigate the effects of short-term volatility, we generally use five-year time periods to measure ourselves. We believe that growth in book value per share is the most comprehensive measure of our success because it includes all underwriting, operating and investing results. For the year ended December 31, 2016, book value per share increased 8% primarily due to net income to shareholders of $455.7 million and a $242.2 million increase in net unrealized gains on investments, net of taxes. For the year ended December 31, 2015, book value per share increased 3% primarily due to net income to shareholders of $582.8 million, partially offset by a $320.5 million decrease in net unrealized gains on investments, net of taxes. Over the past five years, we have grown book value per share at a compound annual rate of 11% to $606.30 per share.

The following graph presents book value per share for the past five years as of December 31.

Book Value Per Share

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Regulatory Environment

Our insurance subsidiaries are subject to regulation and supervision by the insurance regulatory authorities of the various jurisdictions in which they conduct business. This regulation is intended for the benefit of policyholders rather than shareholders or holders of debt securities. The jurisdictions of our principal insurance subsidiaries are the United States, the United Kingdom and Bermuda. Our Markel Ventures, Markel CATCo and other non-insurance businesses also are subject to regulation and supervision by regulatory authorities of the various jurisdictions in which they conduct business.

United States Insurance Regulation

Overview. Our U.S. insurance subsidiaries are subject to varying degrees of regulation and supervision in the jurisdictions in which they do business. Each state has its own regulatory authority for insurance that is generally responsible for the direct regulation of the business of insurance conducted in that state. In addition, the National Association of Insurance Commissioners (NAIC), comprised of the insurance commissioners of each U.S. jurisdiction, develops or amends model statutes and regulations that in turn most states adopt. While the U.S. federal government and its regulatory agencies generally do not directly regulate the business of insurance, there have been recent federal initiatives that impact the business of insurance.

State Insurance Regulation. In the United States, authority for the regulation, supervision and administration of the business of insurance in each state is generally delegated to a state commissioner heading a regulatory body responsible for the business of insurance. Through this authority, state regulatory authorities have broad regulatory, supervisory and administrative powers relating to solvency standards; the licensing of insurers and their agents; the approval of forms and policies used; the nature of, and limitations on, insurers' investments; the form and content of annual statements and other reports on the financial condition of insurers; and the establishment of loss reserves. Our U.S. insurance subsidiaries that operate on an admitted basis are typically subject to regulatory rate and form review, while our U.S. excess and surplus lines insurance subsidiaries generally operate free of rate and form regulation.

Holding Company Statutes. In addition to regulatory supervision of our domestic insurance subsidiaries, we are subject to state statutes governing insurance holding company systems. Typically, such statutes require that we periodically file information with the appropriate state insurance commissioner, including information concerning our capital structure, ownership, financial condition, material transactions with affiliates and general business operations. In addition, these statutes also require approval of changes in control of an insurer or an insurance holding company. Generally, control for these purposes is defined as ownership or voting power of 10% or more of a company's voting shares. Additional requirements include group-level reporting, submission of an annual enterprise risk report by a regulated insurance company's ultimate controlling person and information regarding an insurer's non-insurer affiliates.

Risk Based Capital Requirements. The NAIC uses a risk based capital formula that is designed to measure the capital of an insurer taking into account the company's investments and products. These requirements provide a formula which, for property and casualty insurance companies, establishes capital thresholds for four categories of risk: asset risk, insurance risk, interest rate risk and business risk. At December 31, 2016, the capital and surplus of each of our United States insurance subsidiaries was above the minimum regulatory thresholds.

Own Risk and Solvency Assessment. We must submit annually to the Illinois Department of Insurance, our lead state insurance regulator, an Own Risk and Solvency Assessment Summary Report (ORSA). The ORSA is a confidential internal assessment of the material and relevant risks associated with an insurer's current business plan and the sufficiency of capital resources to support those risks.

Excess and Surplus Lines. The regulation of our U.S. insurance subsidiaries' excess and surplus lines insurance business differs significantly from the regulation of our admitted business. Our surplus lines subsidiaries are subject to the surplus lines regulation and reporting requirements of the jurisdictions in which they are eligible to write surplus lines insurance. Although the surplus lines business is generally less regulated than admitted business, regulations apply to surplus lines placements under the laws of every state.

Dividends. The laws of the domicile states of our U.S. insurance subsidiaries govern the amount of dividends that may be paid to our holding company, Markel Corporation. Generally, statutes in the domicile states of our insurance subsidiaries require prior approval for payment of extraordinary, as opposed to ordinary, dividends. At December 31, 2016, our United States insurance subsidiaries could pay up to $330.4 million during the following 12 months under the ordinary dividend regulations.

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Trade Practices. State insurance laws and regulations include numerous provisions governing trade practices and the marketplace activities of insurers, including provisions governing marketing and sales practices, data security, policyholder services, claims management, anti-fraud controls and complaint handling. State regulatory authorities generally enforce these provisions through periodic market conduct examinations.

Investment Regulation. Investments by our domestic insurance companies must comply with applicable laws and regulations that prescribe the kind, quality and concentration of investments. In general, these laws and regulations permit investments in federal, state and municipal obligations, corporate bonds, preferred and common equity securities, mortgage loans, real estate and certain other investments, subject to specified limits and certain other qualifications.

The Terrorism Risk Insurance Act. The Terrorism Risk Insurance Act of 2002, as amended (TRIA), has established a federal program that provides for a system of shared public and private compensation for certain insured losses resulting from acts of terrorism. In early 2015 the program was extended for another six years, and is now scheduled to expire in 2020. In addition, the most recent extension of TRIA (1) raises the threshold for the program to go into effect (the triggering event) from $100 million in losses to $200 million, in $20 million increments starting in January 2016 and (2) increases the amount that insurers must cover as a whole through co-payments and deductibles, which is known in the industry as the aggregate retention. The aggregate retention amount will rise by $2 billion a year to $37.5 billion from $27.5 billion, starting in 2016. TRIA is applicable to almost all commercial lines of property and casualty insurance but excludes commercial auto, burglary and theft, surety, professional liability and farm owners' multi-peril insurance. Insurers with direct commercial property and casualty insurance exposure in the United States are required to participate in the program and make available coverage for certified acts of terrorism. Federal participation will be triggered under TRIA when the Secretary of Treasury certifies an act of terrorism.

Federal Regulation. The federal government and its regulatory agencies generally do not directly regulate the business of insurance. However, two federal government bodies, the Federal Insurance Office (FIO) and the Financial Stability Oversight Council (FSOC), each created under The Dodd Frank Wall Street Reform and Consumer Protection Act enacted in 2010, may impact the regulation of insurance. Although the FIO is prohibited from directly regulating the business of insurance, it has authority to represent the United States in international insurance matters and has limited powers to preempt certain types of state insurance laws. The FIO also can recommend to the FSOC that it designate an insurer as an entity posing risks to the United States financial stability in the event of the insurer's material financial distress or failure. We have not been so designated.

United Kingdom Insurance Regulation

Under the Financial Services and Markets Act 2000 (FSMA), it is unlawful to carry on insurance business in the United Kingdom without permission to do so from the relevant regulators. Before April 1, 2013, the Financial Services Authority (FSA) was responsible for supervising all securities, banking and insurance business in the United Kingdom. With the enactment of the Financial Services Act 2012 (which amended FSMA), the FSA was replaced by two regulators: the Prudential Regulation Authority (PRA) and the Financial Conduct Authority (FCA). An independent Financial Policy Committee (FPC) at the Bank of England supervises the financial services sector at a macro level, responding to sectoral issues that could threaten economic and financial stability.

Both MIICL and MSM, our Lloyd's managing agent, are authorized by the PRA and regulated by both the PRA and the FCA. In addition, our United Kingdom insurance operations include FCA-authorized insurance intermediaries that produce insurance for MIICL, Syndicate 3000 and third party insurance carriers.

The PRA is a subsidiary of the Bank of England and is responsible for the prudential regulation and supervision of banks, building societies, credit unions, major investment firms and insurers, including the Society of Lloyd's and managing agents that participate in the Lloyd's market. The two primary statutory objectives of the PRA are to promote the safety and soundness of the firms it regulates and, specific to insurers, to contribute to securing an appropriate degree of protection for those who are, or may become, policyholders. In 2014 the PRA was given a secondary objective which is to facilitate effective competition. The FCA, which is separate from the Bank of England, is accountable to HM Treasury and ultimately the United Kingdom Parliament. The FCA supervises the day-to-day conduct of insurance firms and other authorized firms operating in the United Kingdom, including those participating in the Lloyd's market and UK insurance intermediaries. The overarching strategic objective of the FCA is to ensure that the relevant markets function well. The FCA also has three operational objectives: securing an appropriate degree of protection for consumers, protecting and enhancing the integrity of the UK financial system, and promoting effective competition in the interests of consumers.

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The PRA assesses the insurance firms it regulates on a continuous cycle, requiring firms to submit sufficient data of appropriate quality to support their judgments about key risks, through meetings of directors, officers and other employees with PRA supervisors. The PRA also oversees compliance with minimum solvency and capital requirements under the Solvency II Directive (Solvency II) and imposes dividend restrictions. Both the PRA and the FCA oversee compliance with risk assessment reviews, restrictions governing the appointment of key officers, restrictions governing controlling ownership interests and various other requirements. In addition, both the PRA and FCA have arrangements with Lloyd's for cooperation on supervision and enforcement of the Lloyd's market.

MIICL must provide advance notice to the PRA for any dividends from MIICL and any transaction or proposed transaction with a connected or related person. MSM is required to satisfy the solvency requirements of Lloyd's. In addition, our United Kingdom subsidiaries must comply with the United Kingdom Companies Act of 2006, which provides that dividends may only be paid out of profits available for that purpose.

In addition, under Solvency II, the regulatory framework for the European insurance industry in place effective January 1, 2016, MIICL must give the PRA advance notice of any material intra-group transaction which Markel International Limited (the indirect parent of MIICL) or any of its subsidiaries intends to enter into with a group entity outside the European Economic Area and any material payment, including the payment of a dividend, other distribution or capital extraction which Markel International Limited or any of its subsidiaries intends to make to a group entity outside the European Economic Area.

MIICL and MSM each submit, at least annually, an ORSA to the PRA and Lloyd’s, respectively. The ORSA is a confidential internal assessment of the material risks associated with the current business plans for MIICL and MSM and the sufficiency of capital resources in place to support those risks.

Bermuda Insurance Regulation

The insurance and reinsurance industry in Bermuda is regulated by the Bermuda Monetary Authority (BMA). Markel Bermuda is regulated by the BMA as a Class 4 general business and Class C long-term business insurer under the Insurance Act 1978 of Bermuda and its related regulations (Bermuda Insurance Act). The Bermuda Insurance Act imposes on Markel Bermuda solvency and liquidity standards, restrictions on the reduction of statutory capital and auditing and reporting requirements. The Bermuda Insurance Act grants to the BMA powers to cancel insurance licenses, supervise, investigate and intervene in the affairs of Bermuda insurance and reinsurance companies and, in certain circumstances, share information with foreign regulators. Bermuda's prudential framework for the supervision of insurance and reinsurance companies and groups is deemed to be fully equivalent to the regulatory standards applied to European insurance and reinsurance companies and groups under Solvency II. As a result, Bermuda is considered by European member states as applying an equivalent statutory insurance regime in accordance with the requirements of Solvency II with respect to reinsurance, group solvency calculations and group supervision. The equivalence recognition applies to Bermuda's commercial Class 3A, 3B, 4, Class C, Class D and Class E insurers and reinsurers and groups.

Markel Bermuda is subject to enhanced capital requirements in addition to minimum solvency and liquidity requirements. The enhanced capital requirement is determined by reference to a risk-based capital model that determines a control threshold for statutory capital and surplus by taking into account the risk characteristics of different aspects of the insurer's business. At December 31, 2016, Markel Bermuda satisfied both the enhanced capital requirements and the minimum solvency and liquidity requirements.

Markel Bermuda also must submit annually to the BMA a Commercial Insurer Solvency Self-Assessment (CISSA). The CISSA is a confidential internal assessment of the material and relevant risks associated with an insurer's current business plan and the sufficiency of capital resources to support those risks.

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Under the Bermuda Insurance Act, Markel Bermuda is prohibited from paying or declaring dividends during a fiscal year if it is in breach of its enhanced capital requirement, solvency margin or minimum liquidity ratio or if the declaration or payment of the dividend would cause a breach of those requirements. If an insurer fails to meet its solvency margin or minimum liquidity ratio on the last day of any financial year, it is prohibited from declaring or paying any dividends during the next financial year without the approval of the BMA. Further, Markel Bermuda is prohibited from declaring or paying in any financial year dividends of more than 25% of its total statutory capital and surplus as set forth in its previous year's statutory balance sheet unless at least seven days before payment of those dividends it files with the BMA an affidavit stating that it will continue to meet its solvency margin and minimum liquidity ratio. Markel Bermuda must obtain the BMA's prior approval for a reduction by 15% or more of the total statutory capital as set forth in its previous year's financial statements. In addition, as a Class C long-term insurer, Markel Bermuda may not declare or pay a dividend to any person other than a policyholder unless the value of the assets in its long-term business fund, as certified by Markel Bermuda's approved actuary, exceeds the liabilities of its long-term business. The amount of the dividend cannot exceed the aggregate of that excess and any other funds legally available for the payment of the dividend. At December 31, 2016, Markel Bermuda could pay up to $547.4 million in dividends during the following 12 months without making any additional filings with the BMA.

Markel CATCo Re Ltd (Markel CATCo Re) is licensed as a Bermuda Class 3 reinsurance company and is subject to regulation and supervision of the BMA. See "Regulation of Markel CATCo" under "Other Regulation" below for more information about the regulation of Markel CATCo Re.

Other Insurance Jurisdictions

The European Union (E.U.) implemented Solvency II effective January 1, 2016. Solvency II replaces existing insurance directives and creates a pan-European, risk based solvency regime which affects all insurers and reinsurers throughout the E.U. The Solvency II regime is based on three pillars: financial requirements; governance and risk management requirements; and disclosure requirements. The European Commission has developed detailed rules that complement the high-level principles of Solvency II.

At present the United States is not recognized as Solvency II "equivalent." Therefore, MIICL has agreed on "other methods" with the PRA which includes the provision to the PRA of certain specified information regarding Markel Corporation and its insurance companies.

In addition, as a global provider of specialty insurance and reinsurance, our insurance subsidiaries must comply with various regulatory requirements in jurisdictions where they conduct business in addition to the jurisdictions in which they are domiciled. For example, MIICL and our Lloyd's operations must comply with applicable Latin America regulatory requirements in connection with our Latin American reinsurance operations. In addition to the regulatory requirements imposed by the jurisdictions in which an insurer or reinsurer is licensed, a reinsurer's business operations are affected by regulatory requirements governing credit for reinsurance in other jurisdictions in which its ceding companies are located. In general, a ceding company that obtains reinsurance from a reinsurer that is licensed, accredited or approved by the jurisdiction in which the ceding company files statutory financial statements is permitted to reflect in its statutory financial statements a credit in an aggregate amount equal to the liability for unearned premiums and loss reserves and loss expense reserves ceded to the reinsurer. Many jurisdictions also permit ceding companies to take credit on their statutory financial statements for reinsurance obtained from unlicensed or non-admitted reinsurers if certain prescribed security arrangements are made. As an example, Markel Bermuda currently is not licensed, accredited or approved in every jurisdiction where its reinsurance customers are domiciled. As a result, Markel Bermuda may be required to provide a letter of credit or other security arrangement for its reinsurance customers domiciled in those jurisdictions. In most U.S. states Markel Bermuda has obtained approval of a trust arrangement that satisfies the credit for reinsurance requirements for Markel Bermuda's customers domiciled in those states.

The insurance and reinsurance industry in Brazil is regulated by the Conselho Nacional de Seguros Privados (CNSP) and supervised by the Superintendência de Seguros Privados (SUSEP) on behalf of the Ministry of Finance. Markel Resseguradora do Brasil SA (Markel Brazil) is authorized by SUSEP as a local Brazilian reinsurance company. Markel Brazil is required to submit monthly returns, audited annual returns and annual financial statements to SUSEP.

On June 23, 2016, the United Kingdom voted to exit the European Union ("Brexit"). For discussion regarding Brexit, see the Risk Factor titled "The United Kingdom's vote to leave, and the eventual exit of the United Kingdom from, the European Union could adversely affect us."

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Global Supervisory College

The global insurance regulatory framework now also includes supervisory colleges. A supervisory college is a forum of the regulators having jurisdictional authority over an insurance holding company's worldwide insurance subsidiaries. The supervisory college meets with executive management to evaluate the insurance group on both a group-wide and legal-entity basis, particularly with respect to its financial data, business strategies, enterprise risk management and corporate governance. The Illinois Department of Insurance, our lead insurance regulator, and several other regulators conducted an initial supervisory college with our executives in December 2016. Additional meetings of our supervisory college are scheduled for July 2017 and August 2018.

Other Regulation

Markel Ventures. Our Markel Ventures businesses are subject to a wide variety of U.S. federal, state, and local laws and regulations, as well as foreign laws and regulations applicable to their non-U.S. operations, including:

• For our Markel Ventures manufacturing operations, laws and regulations in the areas of safety, health, employment and environmental pollution controls, as well as U.S. and international trade and anti-corruption laws and regulations; and

• For our Markel Ventures non-manufacturing operations, laws and regulations in the areas of data privacy and security, health care, government contracting and employment.

Solicitors Regulation Authority. LHS Solicitors LLP (LHS), a wholly owned subsidiary, is a full service commercial law firm with offices in Manchester and Croydon, England. LHS employs approximately 70 lawyers who provide legal services to small and medium-sized enterprises in the United Kingdom. LHS is authorized and regulated by the Solicitors Regulation Authority (SRA). The SRA is an independent regulatory body of the Law Society of England and Wales which regulates the conduct of solicitors and law firms to protect consumers and to support the rule of law and the administration of justice. The SRA works within a statutory framework for regulation provided by the Solicitors Act 1974, the Administration of Justice Act 1985 and, primarily, by the Legal Services Act 2007.

Regulation of Markel CATCo. We conduct our Markel CATCo operations through three companies: MCIM, Markel CATCo Reinsurance Fund Ltd. (Markel CATCo Fund) and Markel CATCo Re.

MCIM is a Bermuda exempted limited liability company. MCIM holds an investment business license issued by the BMA under the Investment Business Act 2003 and is regulated by the BMA. MCIM is not registered as an investment company under the U.S. Investment Company Act of 1940, an investment adviser under the U.S. Investment Advisers Act of 1940 or as a "commodity pool operator" or "commodity trading advisor" with the U.S. Commodity Futures Trading Commission.

Markel CATCo Fund is a mutual fund company with limited liability under the Companies Act 1981 of Bermuda and is registered as a segregated accounts company under the Bermuda Segregated Accounts Companies Act 2000.

Markel CATCo Re is also registered as a segregated accounts company under the Bermuda Segregated Accounts Companies Act 2000 and is licensed as a Bermuda Class 3 reinsurance company subject to regulation and supervision of the BMA. Under the Bermuda Insurance Act, and related regulations and policies of the BMA, Markel CATCo Re must, among other things, (i) maintain a minimum level of capital, surplus and liquidity; (ii) satisfy solvency standards; (iii) restrict dividends and distributions; (iv) obtain prior approval of ownership and transfer of shares; (v) maintain a principal office and appoint and maintain a principal representative in Bermuda; and (vi) provide for the performance of certain periodic examinations of Markel CATCo Re and its financial condition. In addition, the BMA requires that Markel CATCo Re contract for local services, such as corporate secretary, insurance manager and registered representative, at market rates.

Ratings

Financial stability and strength are important purchase considerations of policyholders, cedents and insurance agents and brokers. Because an insurance premium paid today purchases coverage for losses that might not be paid for many years, the financial viability of the insurer is of critical concern. Various independent rating agencies provide information and assign ratings to assist buyers in their search for financially sound insurers. Rating agencies periodically re-evaluate assigned ratings based upon changes in the insurer's operating results, financial condition or other significant factors influencing the insurer's business. Changes in assigned ratings could have an adverse impact on an insurer's ability to write new business.

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Best assigns financial strength ratings (FSRs) to property and casualty insurance companies based on quantitative criteria such as profitability, leverage and liquidity, as well as qualitative assessments such as the spread of risk, the adequacy and soundness of ceded reinsurance, the quality and estimated market value of assets, the adequacy of loss reserves and surplus and the competence, experience and integrity of management. Best's FSRs range from "A++" (superior) to "F" (in liquidation).

Nine of our ten insurance subsidiaries are rated by Best. All nine of our insurance subsidiaries rated by Best have been assigned an FSR of "A" (excellent). Our Lloyd's syndicate is part of a group rating for the Lloyd's overall market, which has been assigned an FSR of "A" (excellent) by Best.

Nine of our ten insurance subsidiaries are rated by S&P. All nine of our insurance subsidiaries rated by S&P have been assigned an FSR of "A" (strong). Our Lloyd's syndicate is part of a group rating for the Lloyd's overall market, which has been assigned an FSR of "A+" (strong) by S&P.

Eight of our ten insurance subsidiaries are rated by Fitch Ratings (Fitch). All eight of our insurance subsidiaries rated by Fitch have been assigned an FSR of "A+" (strong). Our Lloyd's syndicate is part of a group rating for the Lloyd's overall market, which has been assigned an FSR of "AA-" (very strong) by Fitch.

Five of our ten insurance subsidiaries are rated by Moody's Corporation (Moody's). All five insurance subsidiaries rated by Moody's have been assigned an FSR of "A2" (good).

The various rating agencies typically charge companies fees for the rating and other services they provide. During 2016, we paid rating agencies, including Best, S&P, Fitch and Moody's, $2.2 million for their services.

Risk Factors

A wide range of factors could materially affect our future prospects and performance. The matters addressed under "Safe Harbor and Cautionary Statement," "Critical Accounting Estimates" and "Market Risk Disclosures" in Management's Discussion and Analysis of Financial Condition and Results of Operations and other information included or incorporated in this report describe many of the significant risks that could affect our operations and financial results. We are also subject to the following risks.

We may experience losses from catastrophes. As a property and casualty insurance company, we may experience losses from man-made or natural catastrophes. Catastrophes may have a material adverse effect on operations. Catastrophes include, but are not limited to, windstorms, hurricanes, earthquakes, tornadoes, hail, severe winter weather and fires and may include events related to terrorism and political unrest. While we employ catastrophe modeling tools in our underwriting process, we cannot predict how severe a particular catastrophe will be before it occurs. The extent of losses from catastrophes is a function of the total amount of losses incurred, the number of insureds affected, the frequency and severity of the events, the effectiveness of our catastrophe risk management program and the adequacy of our reinsurance coverage. Most catastrophes occur over a small geographic area; however, some catastrophes may produce significant damage in large, heavily populated areas. If, as many forecast, climate change results in an increase in the frequency and severity of weather-related catastrophes, we may experience additional catastrophe-related losses, which may be material.

Our results may be affected because actual insured or reinsured losses differ from our loss reserves. Significant periods of time often elapse between the occurrence of an insured or reinsured loss, the reporting of the loss to us and our payment of that loss. To recognize liabilities for unpaid losses, we establish reserves as balance sheet liabilities representing estimates of amounts needed to pay reported and unreported losses and the related loss adjustment expenses. The process of estimating loss reserves is a difficult and complex exercise involving many variables and subjective judgments. This process may become more difficult if we experience a period of rising inflation. As part of the reserving process, we review historical data and consider the impact of such factors as:

• trends in claim frequency and severity,

• changes in operations,

• emerging economic and social trends,

• trends in insurance rates,

• inflation or deflation, and

• changes in the regulatory and litigation environments.

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This process assumes that past experience, adjusted for the effects of current developments and anticipated trends, is an appropriate basis for predicting future events. There is no precise method, however, for evaluating the impact of any specific factor on the adequacy of reserves, and actual results will differ from original estimates. As part of the reserving process, we regularly review our loss reserves and make adjustments as necessary. Future increases in loss reserves will result in additional charges to earnings, which may be material.

In addition, reinsurance reserves are subject to greater uncertainty than insurance reserves primarily because a reinsurer relies on (i) the original underwriting decisions made by ceding companies and (ii) information and data from ceding companies. As a result, we are subject to the risk that our ceding companies may not have adequately evaluated the risks reinsured by us and the premiums ceded may not adequately compensate us for the risks we assume. In addition, reinsurance reserves may be less reliable than insurance reserves because there is generally a longer lapse of time from the occurrence of the event to the reporting of the loss or benefit to the reinsurer and ultimate resolution or settlement of the loss.

Changes in the assumptions and estimates used in establishing reserves for our life and annuity reinsurance book could result in material increases in our estimated loss reserves for such business.  Our run-off life and annuity reinsurance book exposes us to mortality risk, which is the risk that the level of death claims may differ from that which we assumed in establishing the reserves for our life and annuity reinsurance contracts. Some of our life and annuity reinsurance contracts expose us to longevity risk, which is the risk that an insured person will live longer than expected when the reserves were established, or morbidity risk, which is the risk that an insured person will become critically ill or disabled. Our reserving process for the life and annuity reinsurance book is designed with the objective of establishing appropriate reserves for the risks we assumed. Among other things, these processes rely heavily on analysis of mortality, longevity and morbidity trends, lapse rates, interest rates and expenses. As of December 31, 2016, our reserves for life and annuity benefits totaled $1.0 billion.

We expect mortality, morbidity, longevity, and lapse experience to fluctuate somewhat from period to period, but believe they should remain reasonably predictable over a period of many years. Mortality, longevity, morbidity or lapse experience that is less favorable than the mortality, longevity, morbidity or lapse rates that we used in establishing the reserves for a reinsurance agreement will negatively affect our net income because the reserves we originally set for the risks we assumed may not be sufficient to cover the future claims and expense payments. Furthermore, even if the total benefits paid over the life of the contract do not exceed the expected amount, unexpected increases in the incidence of deaths or illness can cause us to pay more benefits in a given reporting period than expected, adversely affecting our net income in any particular reporting period. Fluctuations in interest rates will impact the performance of our investments. If there are changes to any of the above factors to the point where a reserve deficiency exists, a charge to earnings will be recorded, which may have a material adverse impact on our results of operations and financial condition.

We are subject to regulation by insurance regulatory authorities that may affect our ability to implement and achieve our business objectives. Our insurance subsidiaries are subject to supervision and regulation by the insurance regulatory authorities in the various jurisdictions in which they conduct business. This regulation is intended for the benefit of policyholders rather than shareholders or holders of debt securities. Insurance regulatory authorities have broad regulatory, supervisory and administrative powers relating to solvency standards, licensing, coverage requirements, policy rates and forms and the form and content of financial reports. Regulatory and legislative authorities continue to implement enhanced or new regulatory requirements intended to prevent future financial crises or otherwise assure the stability of financial institutions. Regulatory authorities also may seek to exercise their supervisory or enforcement authority in new or more aggressive ways, such as imposing increased capital requirements. Any such actions, if they occur, could affect the competitive market and the way we conduct our business and manage our capital. As a result, such actions could materially affect our results of operations, financial condition and liquidity.

Our ability to make payments on debt or other obligations depends on the receipt of funds from our subsidiaries. We are a holding company, and substantially all of our insurance operations are conducted through our regulated insurance subsidiaries. As a result, our cash flow and our ability to service our debt are dependent upon the earnings of our subsidiaries and on the distribution of earnings, loans or other payments by our subsidiaries to us. In addition, payment of dividends by our insurance subsidiaries may require prior regulatory notice or approval.

Our investment results may be impacted by changes in interest rates, U.S. and international monetary and fiscal policies as well as broader economic conditions. We receive premiums from customers for insuring their risks. We invest these funds until they are needed to pay policyholder claims or until they are recognized as profits. Fluctuations in the value of our investment portfolio can occur as a result of changes in interest rates and U.S. and international monetary and fiscal policies as well as broader economic conditions (including, for example, equity market conditions and significant inflation or deflation). Our investment results may be materially impacted by one or more of these factors.

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Competition in the insurance and reinsurance markets could reduce our underwriting profits. Insurance and reinsurance markets are highly competitive. We compete on an international and regional basis with major U.S., Bermuda, European, and other international insurers and reinsurers and with underwriting syndicates, some of which have greater financial, marketing, and management resources than we do. Recent industry consolidation, including business combinations among insurance and other financial services companies, has resulted in larger competitors with even greater financial resources. We also compete with new companies that continue to be formed to enter the insurance and reinsurance markets, particularly companies with new or "disruptive" technologies or business models. In addition, capital market participants have created alternative products that are intended to compete with reinsurance products. Increased competition could result in fewer submissions, lower premium rates, and less favorable policy terms and conditions, which could reduce our underwriting profits and have a material adverse effect on our results of operations and financial condition.

The historical cyclicality in the property and casualty insurance industry could adversely affect our ability to improve or maintain underwriting profits or to grow or maintain premium volume. The insurance and reinsurance markets have historically been cyclical, characterized by periods of intense price competition due to excessive underwriting capacity as well as periods when shortages of capacity permitted more favorable rate levels. Among our competitive strengths have been our specialty product focus and our niche market strategy. These strengths also make us vulnerable in periods of intense competition to actions by other insurance companies who seek to write additional premiums without appropriate regard for underwriting profitability. During soft markets, it is very difficult for us to grow or maintain premium volume levels without sacrificing underwriting profits. If we are not successful in maintaining rates or achieving rate increases, it may be difficult for us to improve or maintain underwriting profits or to grow or maintain premium volume levels.

We invest a significant portion of our invested assets in equity securities, which may result in significant variability in our investment results and may adversely impact shareholders' equity. Additionally, our equity investment portfolio is concentrated, and declines in the value of these significant investments could adversely affect our financial results. Equity securities were 56% and 52% of our shareholders' equity at December 31, 2016 and 2015, respectively. Equity securities have historically produced higher returns than fixed maturity securities; however, investing in equity securities may result in significant variability in investment returns from one period to the next. In volatile financial markets, we could experience significant declines in the fair value of our equity investment portfolio, which would result in a material decrease in shareholders' equity. Our equity portfolio is concentrated in particular issuers and industries and, as a result, a decline in the fair value of these concentrated investments also could result in a material decrease in shareholders' equity. A material decrease in shareholders' equity may adversely impact our ability to carry out our business plans.

General economic, market or industry conditions could lead to investment losses, adverse effects on our businesses and limit our access to the capital markets. General economic and market conditions and industry specific conditions, including extended economic recessions or expansions; prolonged periods of slow economic growth; inflation or deflation; fluctuations in foreign currency exchange rates, commodity and energy prices and interest rates; volatility in the credit and capital markets; and other factors, could lead to substantial realized and unrealized investment losses in future periods, declines in demand for or increased claims made under our insurance products or limited or no access to the capital markets, any of which could have a material adverse effect on our results of operations, financial condition, debt and financial strength ratings or our insurance subsidiaries' capital.

We rely on the purchase of reinsurance and bear collection risk if the reinsurer fails to meet its obligations under the reinsurance agreement. We purchase reinsurance and retrocessional reinsurance to manage our net retention on individual risks and overall exposure to losses, while providing us with the ability to offer policies with sufficient limits to meet policyholder needs. The ceding of insurance does not legally discharge us from our primary liability for the full amount of the policies. Reliance on reinsurance may create credit risk as a result of the reinsurer's inability or unwillingness to pay reinsurance claims when due. Deterioration in the credit quality of existing reinsurers or disputes over the terms of reinsurance could result in charges to earnings, which may have a material adverse impact on our results of operations and financial condition. The availability and cost of reinsurance are determined by market conditions beyond our control. There is no guarantee that our desired amounts of reinsurance or retrocessional reinsurance will be available in the marketplace in the future.

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Our information technology systems could fail or suffer a security breach, which could adversely affect our business or reputation or result in the loss of sensitive information. Our businesses are dependent upon the operational effectiveness and security of our enterprise systems and those maintained by third parties. Among other things, we rely on these systems to interact with producers, insureds, customers, clients, and other third parties, to perform actuarial and other modeling functions, to underwrite business, to prepare policies and process premiums, to process claims and make claims payments, to prepare internal and external financial statements and information, as well as to engage in a wide variety of other business activities. A significant failure of our enterprise systems, or those of third parties upon which we may rely, whether because of a breakdown, natural disaster or a cyber-attack on our systems, could compromise our personal, confidential and proprietary information as well as that of our customers and business partners, impede or interrupt our business operations and could result in other negative consequences, including remediation costs, loss of revenue, additional regulatory scrutiny and fines, litigation and monetary and reputational damages. Although we have implemented controls and take protective actions to reduce the risk of an enterprise failure and protect against a security breach, such measures may be insufficient to prevent, or mitigate the effects of, a breakdown, natural disaster or a cyber-attack on our systems that could result in liability to us, cause our data to be corrupted or stolen and cause us to commit resources, management time and money to prevent or correct those failures.

In addition, we are subject to numerous data privacy laws and regulations enacted in the jurisdictions in which we do business. A misuse or mishandling of confidential or proprietary information being sent to or received from a client, employee or third party could result in legal liability, regulatory action and reputational harm. Third parties to whom we outsource certain functions are also subject to these risks, and their failure to adhere to these laws and regulations could negatively impact us.

Further, we routinely transmit, receive and store personal, confidential and proprietary information by email and other electronic means. Although we attempt to protect this confidential and proprietary information, we may be unable to do so in all cases, especially with customers, business partners and other third parties who may not have or use appropriate controls to protect confidential information.

While we maintain cyber risk insurance providing first party and third party coverages, such insurance may not cover all costs associated with the consequences of personal and confidential and proprietary information being compromised. As a result, in the event of a material cyber security breach, our results of operations could be materially, adversely affected.

We may not find suitable acquisition candidates or new insurance or non-insurance ventures and even if we do, we may not successfully integrate any such acquired companies or successfully invest in such ventures. As part of our growth strategy, we continue to evaluate possible acquisition transactions on an ongoing basis, and at any given time we may be engaged in discussions with respect to possible acquisitions and new ventures. We may not be able to identify suitable acquisition targets or ventures, any such transactions may not be financed or completed on acceptable terms and our future acquisitions or ventures may not be successful.

The integration of acquired companies may not be as successful as we anticipate. We have recently engaged in a number of acquisitions in an effort to achieve profitable growth in our insurance operations and to create additional value on a diversified basis in our Markel Ventures operations. Acquisitions present operational, strategic and financial risks, as well as risks associated with liabilities arising from the previous operations of the acquired companies. All of these risks are magnified in the case of a large acquisition. Assimilation of the operations and personnel of acquired companies may prove more difficult than anticipated, which may result in failure to achieve financial objectives associated with the acquisition or diversion of management attention. In addition, integration of formerly privately-held companies into the management and internal control and financial reporting systems of a publicly-held company presents additional risks.

Impairments in the value of our goodwill could have a material adverse effect on our operating results and financial condition. Goodwill represents the excess of amounts paid for acquiring businesses over the fair value of the net assets acquired. Goodwill is evaluated for impairment annually, or more frequently if conditions warrant, by comparing the carrying value of a reporting unit to its estimated fair value. Declines in operating results, divestitures, sustained market declines and other factors that impact the fair value of a reporting unit could result in a goodwill impairment and, in turn, a charge to net income. Such a charge could have a material adverse effect on our results of operations or financial condition.

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The failure of any of the loss limitation methods we employ could have a material adverse effect on our financial condition or on our results of operations. We seek to limit our loss exposure in a variety of ways, including adhering to maximum limitations on policies written in defined geographical zones, limiting program size for each client, establishing per risk and per occurrence limitations for each event, employing coverage restrictions and following prudent underwriting guidelines for each program written. We also seek to limit our loss exposure through geographic diversification. Underwriting is a matter of judgment, involving assumptions about matters that are inherently unpredictable and beyond our control, and for which historical experience and probability analysis may not provide sufficient guidance. One or more future events could result in claims that substantially exceed our expectations, which could have a material adverse effect on our financial condition and our results of operations, possibly to the extent of eliminating our shareholders' equity. In addition, we seek to limit loss exposures by policy terms, exclusion from coverage and choice of legal forum. Disputes relating to coverage and choice of legal forum also arise. As a result, various provisions of our policies, such as choice of forum, limitations or exclusions from coverage may not be enforceable in the manner we intend and some or all of our loss limitation methods may prove ineffective.

The effects of emerging claim and coverage issues on our business are uncertain. As industry practices and legal, judicial, social and other environmental conditions change, unexpected and unintended issues related to claims and coverage may emerge. These issues may adversely affect our business by either broadening coverage beyond our underwriting intent or by increasing the number or size of claims. In some instances, these changes may not become apparent until some time after we have issued insurance or reinsurance contracts that are affected by the changes. As a result, the full extent of liability under our insurance or reinsurance contracts may not be known for many years after a contract is issued.

We could be adversely affected by the loss of one or more key executives or by an inability to attract and retain qualified personnel. Our success depends on our ability to retain the services of our existing key executives and to attract and retain additional qualified personnel in the future. The loss of the services of any of our key executives or the inability to hire and retain other highly qualified personnel in the future could adversely affect our ability to conduct or grow our business.

We have substantial international operations and investments, which expose us to increased political, operational and economic risks. A substantial portion of our revenues and income is derived from our operations and investments outside the U.S., including from the United Kingdom, Bermuda, Europe, Asia, South America and the Middle East. Our international operations and investments expose us to increased political, operational and economic risks. These risks include foreign currency and credit risk. Changes in the value of the U.S. dollar relative to other currencies could have an adverse effect on our results of operations and financial condition. Our investments in non-U.S. dollar-denominated securities are subject to fluctuations in non-U.S. securities and currency markets, and those markets can be volatile.

Deterioration or volatility in foreign and international financial markets or general economic and political conditions could adversely affect our operating results, financial condition and liquidity. Concerns about the economic conditions, capital markets, political and economic stability and solvency of certain countries have contributed to global market volatility. Political changes in the jurisdictions where we operate and elsewhere, some of which may be disruptive, can also interfere with our customers and our activities in a particular location. Our international operations also may be subject to a number of additional risks, particularly in emerging economies, including restrictions such as price controls, capital controls, currency exchange limits, ownership limits and other restrictive or anti-competitive governmental actions or requirements, which could have an adverse effect on our businesses.

Changes in U.S. tax laws or in the tax laws of other jurisdictions in which we operate could adversely impact us. Tax laws may change in ways that adversely impact us. Under the current U.S. administration there exists the potential for comprehensive tax reform in the United States that may significantly change the tax rules applicable to U.S. domiciled corporations and their non-U.S. operations. Changes such as lower corporate tax rates, repatriation allowances, removal of the interest expense deduction, removal of the municipal bond tax exemption or the introduction of a border adjustment tax could impact us as a U.S. taxpayer. For example, a significant portion of our invested assets consist of tax exempt securities and we receive certain tax benefits relating to such securities based on current laws and regulations. Our portfolio has also benefited from certain other laws and regulations, including among others, tax credits. Federal or state tax legislation could be enacted in connection with deficit reduction or various types of fundamental tax reform that would lessen or eliminate some or all of the tax advantages currently benefiting us and therefore could materially and adversely impact our results of operations.

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In addition, tax reform or policy changes could adversely impact our non-U.S. businesses. For example, if a significant tax were to be levied on non-U.S. entities providing insurance or reinsurance inside the U.S., it could adversely affect the international insurance and reinsurance industry. Other changes proposed or under consideration by the current U.S. administration could reduce the attractiveness of operating from non-U.S. locations. These changes, as well as the uncertainty associated with them, could adversely affect our insurance, reinsurance and insurance-linked securities investment management operations located in the U.K. and Bermuda.

We are rated by Best, S&P, Fitch and Moody's, and a downgrade or potential downgrade in one or more of these ratings could adversely affect our businesses, financial condition, results of operations and liquidity. Financial strength ratings are an important factor in establishing the competitive position of insurance and reinsurance companies. Our senior debt ratings also affect the availability and cost of capital. Certain of our insurance and reinsurance company subsidiaries are rated by Best, S&P, Fitch or Moody's, and our senior debt securities, and those of certain of our subsidiaries, also are rated by Best, S&P, Fitch or Moody's. Our financial strength and debt ratings are subject to periodic review, and we cannot be sure that we will be able to retain our current or any future ratings. If our ratings are reduced from their current levels by one or more rating agencies, our competitive position in our target markets within the insurance industry could suffer and it would be more difficult for us to market our products. A significant downgrade could:

• result in a substantial loss of business as policyholders and ceding company clients move to other companies with higher claims-paying and financial strength ratings; and

• trigger contract provisions that allow cedents to terminate their reinsurance contracts on terms disadvantageous to us or require us to collateralize our obligations through trusts or letters of credit.

A ratings downgrade could also adversely affect our liquidity, including the availability of our letter of credit facilities, and limit our access to capital markets, increase our cost of borrowing or issuing debt and require us to post collateral.

We depend on a few brokers for a large portion of our revenues and the loss of business provided by any one of them could adversely affect us. We market our insurance and reinsurance worldwide through insurance and reinsurance brokers. For the year ended December 31, 2016, our top three independent brokers represented approximately 28% of our gross premiums written. Loss of all or a substantial portion of the business provided by one or more of these brokers could have a material adverse effect on our business.

Employee error and misconduct may be difficult to detect and prevent and may result in significant losses. There have been a number of cases involving misconduct by employees in a broad range of industries in recent years, and we run the risk that employee misconduct could occur. Instances of fraud, illegal acts, errors, failure to document transactions properly or to obtain proper internal authorization, or failure to comply with regulatory requirements or our internal policies may result in losses. It is not always possible to deter or prevent employee errors or misconduct, and the controls that we have in place to prevent and detect this activity may not be effective in all cases.

We are subject to applicable laws and regulations relating to economic and trade sanctions and bribery and corruption, the violation of which could have a material adverse effect on us. We are required to comply with the economic and trade sanctions and embargo programs administered by the United States Department of the Treasury's Office of Foreign Assets Control and similar multi-national bodies and governmental agencies worldwide, as well as applicable anti-corruption laws and regulations of the United States and other jurisdictions where we operate. A violation of a sanction, embargo program, or anti-corruption law, could subject us, and individual employees, to a regulatory enforcement action as well as significant civil and criminal penalties. In addition, a violation could result in defaults under our outstanding indebtedness or credit facilities or damage our businesses or our reputation. Those penalties or defaults, or damage to our businesses or reputation, could have a material adverse effect on our results of operations and financial condition. In some cases the requirements and limitations applicable to the global operations of U.S. companies and their affiliates are more restrictive than those applicable to non-U.S. companies and their affiliates, which also could have a material adverse effect on our results of operations and financial condition.

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The legal and regulatory requirements applicable to our businesses are extensive. Failure to comply could have a material adverse effect on us. Our businesses are highly dependent on our ability to engage on a daily basis in a large number of financial and operational activities, including among others insurance underwriting, claim processing, investment activities and the management of third party capital, many of which are highly complex. These activities are subject to internal guidelines and policies, as well as legal and regulatory standards, including, among others, those related to privacy, anti-corruption, anti-bribery and global finance and insurance matters. Our continued expansion into new businesses and markets has brought about additional requirements. While we believe that we have adopted appropriate risk management and compliance programs, compliance risks will continue to exist, particularly as we become subject to new rules and regulations. Failure to comply with, or to obtain, appropriate authorizations and/or exemptions under any applicable laws and regulations could result in restrictions on our ability to do business or undertake activities that are regulated in one or more of the jurisdictions in which we conduct business and could subject us to fines, penalties, equitable relief and changes to our business practices. In addition, a failure to comply could result in defaults under our outstanding indebtedness or credit facilities or damage our businesses or our reputation. Compliance with applicable laws and regulations is time consuming and personnel-intensive, and changes in these laws and regulations could materially increase our direct and indirect compliance and other expenses of doing business, and have a material adverse effect on our results of operations and financial condition.

We may be exposed to risk in connection with our management of third party capital. Some ofour operating subsidiaries may owe certain legal duties and obligations to third party investors. A failure to fulfill any such duties or obligations couldresult in significant liabilities, penalties or other losses, and harm our businesses and resultsof operations. In addition, third party investors may decide not to renew their interests in the funds we manage, which could materially impact the financial condition of those funds, and could, in turn, have an adverse impact on our results of operations and financial condition. Moreover, we may not be ableto raise additional third party capital for the funds we manage or for potential new funds and therefore wemay forego existing or potential fee income and other income generating opportunities.

The United Kingdom's vote to leave, and the eventual exit of the United Kingdom from, the European Union could adversely affect us. On June 23, 2016, the United Kingdom (U.K.) voted to exit the European Union (E.U.) (Brexit). No member country has left the E.U., and the rules for exit (contained in Article 50 of the Treaty on European Union) are brief. The U.K. High Court ruled that triggering Article 50 requires an Act of Parliament, and this ruling was upheld by the U.K. Supreme Court on January 24, 2017. The U.K. Government has stated that it intends to obtain approval by Parliament and give official notice under Article 50 of its intention to withdraw from the E.U. by March 31, 2017. Once that notice is given, a minimum two-year period would commence during which the U.K. and the E.U. would negotiate the future terms of the U.K.'s relationship with the E.U., including the terms of trade between the U.K. and the E.U.

After Brexit terms are agreed, Brexit could be implemented in stages over a multi-year period. The effects of Brexit will depend on any agreements the U.K. makes to retain access to E.U. markets either during a transitional period or more permanently. Brexit could impair or end the ability of both Markel International Insurance Company Limited (MIICL) and our Lloyd's syndicate to transact business in E.U. countries from our U.K. offices and MIICL's ability to maintain its current branches in E.U. member countries. We are considering whether to establish an insurance carrier in an E.U. member country in order to continue transacting E.U. business if U.K. access to E.U. markets ceases or is materially impaired. The Society of Lloyd's is similarly considering options to maintain access to E.U. business for Lloyd's syndicates. Access to E.U. markets through a solution devised by the Society of Lloyd's may supplement, or serve as an alternative to, a new E.U.-based insurance carrier for business we transact in the E.U.

The eventual exit of the U.K. from the E.U., and negotiations leading up to that exit, could continue to contribute to instability in global financial markets, including foreign currency markets, and adversely affect European and worldwide economic or market conditions. In addition, Brexit could lead to legal uncertainty and potentially divergent national laws and regulations as the U.K. determines which E.U. laws to replace or replicate. Any of these effects of Brexit, and others we cannot anticipate, could adversely affect our business, business opportunities, results of operations, financial condition and cash flows.

Associates

At December 31, 2016, we had approximately 10,900 employees, of whom approximately 3,400 were employed within our insurance operations and approximately 7,500 were employed within our non-insurance operations.

30

SELECTED FINANCIAL DATA (dollars in millions, except per share data) ⁽¹⁾ 

	2016			2015			2014
Results of Operations
Earned premiums	$	3,866		$	3,824		$	3,841
Net investment income	373			353			363
Total operating revenues	5,612			5,370			5,134
Net income (loss) to shareholders	456			583			321
Comprehensive income (loss) to shareholders	667			233			936
Diluted net income (loss) per share	$	31.27		$	41.74		$	22.27
Financial Position
Total investments, cash and cash equivalents and restricted cash and cash equivalents (invested assets)	$	19,059		$	18,181		$	18,638
Total assets	25,875			24,939			25,198
Unpaid losses and loss adjustment expenses	10,116			10,252			10,404
Senior long-term debt and other debt	2,575			2,239			2,251
Shareholders' equity	8,461			7,834			7,595
Common shares outstanding (at year end, in thousands)	13,955			13,959			13,962
OPERATING PERFORMANCE MEASURES (1, 2)
Operating Data
Book value per common share outstanding	$	606.30		$	561.23		$	543.96
Growth (decline) in book value per share	8		%	3		%	14		%
5-Year CAGR in book value per share (3)	11		%	11		%	14		%
Closing stock price	$	904.50		$	883.35		$	682.84
Ratio Analysis
U.S. GAAP combined ratio (4)	92		%	89		%	95		%
Investment yield (5)	2		%	2		%	2		%
Taxable equivalent total investment return (6)	4		%	(1		)%	7		%
Investment leverage (7)	2.3			2.3			2.5
Debt to capital	23		%	22		%	23		%

⁽¹⁾  Reflects the acquisition of Alterra Capital Holdings Limited effective May 1, 2013, which included the issuance of equity totaling $2.3 billion.

⁽²⁾  Operating Performance Measures provide a basis for management to evaluate our performance. The method we use to compute these measures may differ from the methods used by other companies. See further discussion of management's evaluation of these measures in Management's Discussion & Analysis of Financial Condition and Results of Operations.

⁽³⁾  CAGR—compound annual growth rate.

⁽⁴⁾  The U.S. GAAP combined ratio measures the relationship of incurred losses, loss adjustment expenses and underwriting, acquisition and insurance expenses to earned premiums.

⁽⁵⁾  Investment yield reflects net investment income as a percentage of monthly average invested assets at amortized cost.

⁽⁶⁾  See "Investing Results" in Management's Discussion & Analysis of Financial Condition and Results of Operations for detail regarding the calculation of taxable equivalent total investment return.

⁽⁷⁾  Investment leverage represents total invested assets divided by shareholders' equity.

31

2013			2012			2011			2010			2009			2008			2007			5-Year CAGR (3)		10-Year CAGR (3)
$	3,232		$	2,147		$	1,979		$	1,731		$	1,816		$	2,022		$	2,117		14	%	6	%
317			282			264			273			260			282			305			7	%	3	%
4,323			3,000			2,630			2,225			2,069			1,977			2,551			16	%	8	%
281			253			142			267			202			(59		)	406			—		—
459			504			252			431			591			(403		)	337			—		—
$	22.48		$	25.89		$	14.60		$	27.27		$	20.52		$	(5.95	)	$	40.64		—		—
$	17,612		$	9,333		$	8,728		$	8,224		$	7,849		$	6,893		$	7,775		17	%	10	%
23,956			12,557			11,532			10,826			10,242			9,512			10,164			18	%	10	%
10,262			5,371			5,399			5,398			5,427			5,492			5,526			13	%	6	%
2,256			1,493			1,294			1,016			964			694			691			—		—
6,674			3,889			3,388			3,172			2,774			2,181			2,641			20	%	14	%
13,986			9,629			9,621			9,718			9,819			9,814			9,957			—		—
$	477.16		$	403.85		$	352.10		$	326.36		$	282.55		$	222.20		$	265.26		11	%	10	%
18		%	15		%	8		%	16		%	27		%	(16		)%	15		%	—		—
17		%	9		%	9		%	13		%	11		%	10		%	18		%	—		—
$	580.35		$	433.42		$	414.67		$	378.13		$	340.00		$	299.00		$	491.10		—		—
97		%	97		%	102		%	97		%	95		%	99		%	88		%	—		—
3		%	4		%	4		%	4		%	4		%	4		%	4		%	—		—
7		%	9		%	7		%	8		%	13		%	(10		)%	5		%	—		—
2.6			2.4			2.6			2.6			2.8			3.2			2.9			—		—
25		%	28		%	28		%	24		%	26		%	24		%	21		%	—		—

32

MANAGEMENT'S REPORT ON INTERNAL CONTROL OVER FINANCIAL REPORTING

Management is responsible for establishing and maintaining adequate internal control over financial reporting, as defined in Rule 13a-15(f) under the Securities Exchange Act of 1934. Our internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles.

Management does not expect that its internal control over financial reporting will prevent all error and all fraud. A control system, no matter how well conceived and operated, can provide only reasonable, not absolute, assurance that the objectives of the control system are met. Internal control over financial reporting is a process that involves human diligence and compliance and is subject to lapses in judgment and breakdowns resulting from human failures. Because of the inherent limitations in all control systems, no evaluation of controls can provide absolute assurance that all control issues and instances of fraud, if any, have been detected. The design of any system of internal control over financial reporting also is based in part upon certain assumptions about the likelihood of future events, and there can be no assurance that any design will succeed in achieving its stated goals under all potential future conditions.

Under the supervision and with the participation of management, including the Principal Executive Officer and the Principal Financial Officer, we evaluated the effectiveness of our internal control over financial reporting as of December 31, 2016, based on criteria established in Internal Control—Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission. Based on our evaluation, we have concluded that we maintained effective internal control over financial reporting as of December 31, 2016.

KPMG LLP, our independent registered public accounting firm, has issued an attestation report on the effectiveness of the Company's internal control over financial reporting, which is included herein.

Alan I. Kirshner	Anne G. Waleski
Executive Chairman	Executive Vice President and Chief Financial Officer
(Principal Executive Officer)	(Principal Financial Officer)
February 24, 2017

33

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

The Board of Directors and Shareholders

Markel Corporation:

We have audited Markel Corporation's (the Company) internal control over financial reporting as of December 31, 2016, based on criteria established in Internal Control—Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). The Company's management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management's Report on Internal Control over Financial Reporting. Our responsibility is to express an opinion on the Company's internal control over financial reporting based on our audit.

We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audit also included performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

A company's internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company's internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company's assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

In our opinion, Markel Corporation maintained, in all material respects, effective internal control over financial reporting as of December 31, 2016, based on criteria established in Internal Control—Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO).

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated balance sheets of Markel Corporation and subsidiaries as of December 31, 2016 and 2015, and the related consolidated statements of income and comprehensive income, changes in equity, and cash flows for each of the years in the three-year period ended December 31, 2016, and our report dated February 24, 2017 expressed an unqualified opinion on those consolidated financial statements.

Richmond, Virginia

February 24, 2017

34

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

The Board of Directors and Shareholders

Markel Corporation:

We have audited the accompanying consolidated balance sheets of Markel Corporation and subsidiaries (the Company) as of December 31, 2016 and 2015, and the related consolidated statements of income and comprehensive income, changes in equity, and cash flows for each of the years in the three-year period ended December 31, 2016. These consolidated financial statements are the responsibility of the Company's management. Our responsibility is to express an opinion on these consolidated financial statements based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of Markel Corporation and subsidiaries as of December 31, 2016 and 2015, and the results of their operations and their cash flows for each of the years in the three-year period ended December 31, 2016, in conformity with U.S. generally accepted accounting principles.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), Markel Corporation's internal control over financial reporting as of December 31, 2016, based on criteria established in Internal Control—Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO), and our report dated February 24, 2017 expressed an unqualified opinion on the effectiveness of the Company's internal control over financial reporting.

Richmond, Virginia

February 24, 2017

35

MARKEL CORPORATION AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

	December 31,
	2016		2015
	(dollars in thousands)
ASSETS
Investments, available-for-sale, at estimated fair value:
Fixed maturities (amortized cost of $9,591,734 in 2016 and $9,038,158 in 2015)	$	9,891,510	$	9,394,468
Equity securities (cost of $2,481,448 in 2016 and $2,208,834 in 2015)	4,745,841		4,074,475
Short-term investments (estimated fair value approximates cost)	2,336,151		1,642,261
Total Investments	16,973,502		15,111,204
Cash and cash equivalents	1,738,747		2,630,009
Restricted cash and cash equivalents	346,417		440,132
Receivables	1,241,649		1,113,703
Reinsurance recoverable on unpaid losses	2,006,945		2,016,665
Reinsurance recoverable on paid losses	64,892		50,123
Deferred policy acquisition costs	392,410		352,756
Prepaid reinsurance premiums	299,923		322,362
Goodwill	1,142,248		1,167,844
Intangible assets	722,542		792,372
Other assets	946,024		941,945
Total Assets	$	25,875,299	$	24,939,115
LIABILITIES AND EQUITY
Unpaid losses and loss adjustment expenses	$	10,115,662	$	10,251,953
Life and annuity benefits	1,049,654		1,123,275
Unearned premiums	2,263,838		2,166,105
Payables to insurance and reinsurance companies	231,327		224,921
Senior long-term debt and other debt (estimated fair value of $2,721,000 in 2016 and $2,403,000 in 2015)	2,574,529		2,239,271
Other liabilities	1,099,200		1,030,023
Total Liabilities	17,334,210		17,035,548
Redeemable noncontrolling interests	73,678		62,958
Commitments and contingencies
Shareholders' equity:
Common stock	3,368,666		3,342,357
Retained earnings	3,526,395		3,137,285
Accumulated other comprehensive income	1,565,866		1,354,508
Total Shareholders' Equity	8,460,927		7,834,150
Noncontrolling interests	6,484		6,459
Total Equity	8,467,411		7,840,609
Total Liabilities and Equity	$	25,875,299	$	24,939,115

See accompanying notes to consolidated financial statements.

36

MARKEL CORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME

	Years Ended December 31,
	2016			2015			2014
	(dollars in thousands, except per share data)
OPERATING REVENUES
Earned premiums	$	3,865,870		$	3,823,532		$	3,840,912
Net investment income	373,230			353,213			363,230
Net realized investment gains:
Other-than-temporary impairment losses	(18,355		)	(44,481		)	(4,784		)
Net realized investment gains, excluding other-than-temporary impairment losses	83,502			150,961			50,784
Net realized investment gains	65,147			106,480			46,000
Other revenues	1,307,779			1,086,758			883,525
Total Operating Revenues	5,612,026			5,369,983			5,133,667
OPERATING EXPENSES
Losses and loss adjustment expenses	2,050,744			1,938,745			2,202,467
Underwriting, acquisition and insurance expenses	1,498,590			1,455,080			1,460,882
Amortization of intangible assets	68,533			68,947			57,627
Other expenses	1,190,243			1,046,805			854,871
Total Operating Expenses	4,808,110			4,509,577			4,575,847
Operating Income	803,916			860,406			557,820
Interest expense	129,896			118,301			117,442
Loss on early extinguishment of debt	44,100			—			—
Income Before Income Taxes	629,920			742,105			440,378
Income tax expense	169,477			152,963			116,690
Net Income	$	460,443		$	589,142		$	323,688
Net income attributable to noncontrolling interests	4,754			6,370			2,506
Net Income to Shareholders	$	455,689		$	582,772		$	321,182
OTHER COMPREHENSIVE INCOME (LOSS)
Change in net unrealized gains on investments, net of taxes:
Net holding gains (losses) arising during the period	$	275,661		$	(240,170	)	$	687,735
Change in unrealized other-than-temporary impairment losses on fixed maturities arising during the period	35			160			173
Reclassification adjustments for net gains included in net income	(33,528		)	(80,482		)	(26,161		)
Change in net unrealized gains on investments, net of taxes	242,168			(320,492		)	661,747
Change in foreign currency translation adjustments, net of taxes	(11,704		)	(29,278		)	(32,241		)
Change in net actuarial pension loss, net of taxes	(19,100		)	(352		)	(14,750		)
Total Other Comprehensive Income (Loss)	211,364			(350,122		)	614,756
Comprehensive Income	$	671,807		$	239,020		$	938,444
Comprehensive income attributable to noncontrolling interests	4,760			6,297			2,510
Comprehensive Income to Shareholders	$	667,047		$	232,723		$	935,934
NET INCOME PER SHARE
Basic	$	31.41		$	41.99		$	22.38
Diluted	$	31.27		$	41.74		$	22.27

See accompanying notes to consolidated financial statements.

37

MARKEL CORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY

(in thousands)	Common Shares		Common Stock			Retained Earnings			Accumulated Other Comprehensive Income			Total Shareholders' Equity			Noncontrolling Interests			Total Equity			Redeemable Noncontrolling Interests
December 31, 2013	13,986		$	3,288,863		$	2,294,909		$	1,089,805		$	6,673,577		$	4,433		$	6,678,010		$	72,183
Net income (loss)						321,182			—			321,182			(1,981		)	319,201			4,487
Other comprehensive income						—			614,752			614,752			—			614,752			4
Comprehensive Income (Loss)												935,934			(1,981		)	933,953			4,491
Issuance of common stock	19		5,691			—			—			5,691			—			5,691			—
Repurchase of common stock	(43	)	—			(26,053		)	—			(26,053		)	—			(26,053		)	—
Restricted stock awards expensed	—		22,935			—			—			22,935			—			22,935			—
Adjustment of redeemable noncontrolling interests	—		—			(8,186		)	—			(8,186		)	—			(8,186		)	8,186
Purchase of noncontrolling interest	—		(10,257		)	—			—			(10,257		)	905			(9,352		)	(18,566		)
Other	—		1,163			14			—			1,177			3,827			5,004			(5,246		)
December 31, 2014	13,962		3,308,395			2,581,866			1,704,557			7,594,818			7,184			7,602,002			61,048
Net income (loss)						582,772			—			582,772			(988		)	581,784			7,358
Other comprehensive loss						—			(350,049		)	(350,049		)	—			(350,049		)	(73		)
Comprehensive Income (Loss)												232,723			(988		)	231,735			7,285
Issuance of common stock	34		4,752			—			—			4,752			—			4,752			—
Repurchase of common stock	(37	)	—			(31,491		)	—			(31,491		)	—			(31,491		)	—
Restricted stock awards expensed	—		24,129			—			—			24,129			—			24,129			—
Acquisition of CapTech	—		—			—			—			—			—			—			13,817
Adjustment of redeemable noncontrolling interests	—		—			4,144			—			4,144			—			4,144			(4,144		)
Purchase of noncontrolling interest	—		(1,447		)	—			—			(1,447		)	—			(1,447		)	(8,224		)
Other	—		6,528			(6		)	—			6,522			263			6,785			(6,824		)
December 31, 2015	13,959		3,342,357			3,137,285			1,354,508			7,834,150			6,459			7,840,609			62,958
Net income						455,689			—			455,689			99			455,788			4,655
Other comprehensive income						—			211,358			211,358			—			211,358			6
Comprehensive Income												667,047			99			667,146			4,661
Issuance of common stock	54		4,623			—			—			4,623			—			4,623			—
Repurchase of common stock	(58	)	—			(51,142		)	—			(51,142		)	—			(51,142		)	—
Restricted stock awards expensed	—		21,336			—			—			21,336			—			21,336			—
Adjustment of redeemable noncontrolling interests	—		—			(15,472		)	—			(15,472		)	—			(15,472		)	15,472
Purchase of noncontrolling interest	—		350			—			—			350			—			350			(3,517		)
Other	—		—			35			—			35			(74		)	(39		)	(5,896		)
December 31, 2016	13,955		$	3,368,666		$	3,526,395		$	1,565,866		$	8,460,927		$	6,484		$	8,467,411		$	73,678

See accompanying notes to consolidated financial statements.

38

MARKEL CORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS

	Years Ended December 31,
	2016			2015			2014
	(dollars in thousands)
OPERATING ACTIVITIES
Net income	$	460,443		$	589,142		$	323,688
Adjustments to reconcile net income to net cash provided by operating activities:
Deferred income tax expense (benefit)	63,358			(9,678		)	84,543
Depreciation and amortization	194,147			200,987			203,580
Net realized investment gains	(65,147		)	(106,480		)	(46,000		)
Loss on early extinguishment of debt	44,100			—			—
Decrease (increase) in receivables	(163,123		)	5,604			21,148
Increase in deferred policy acquisition costs	(41,619		)	(7,360		)	(99,387		)
Increase (decrease) in unpaid losses and loss adjustment expenses, net	(9,429		)	(91,960		)	249,873
Decrease in life and annuity benefits	(54,580		)	(85,257		)	(62,883		)
Increase (decrease) in unearned premiums, net	134,593			(4,522		)	147,840
Increase (decrease) in payables to insurance and reinsurance companies	11,582			(31,829		)	(45,204		)
Increase (decrease) in income taxes payable	(16,484		)	27,817			(46,576		)
Increase in accrued expenses	67,994			97,273			56,042
Decrease in other liabilities	(90,571		)	(5,793		)	(76,383		)
Other	(641		)	73,207			6,511
Net Cash Provided By Operating Activities	534,623			651,151			716,792
INVESTING ACTIVITIES
Proceeds from sales of fixed maturities and equity securities	365,822			538,978			1,286,871
Proceeds from maturities, calls and prepayments of fixed maturities	963,165			1,503,616			1,420,817
Cost of fixed maturities and equity securities purchased	(2,205,939		)	(1,576,254		)	(3,153,055		)
Net change in short-term investments	(689,194		)	(62,124		)	(129,164		)
Proceeds from sales of equity method investments	8,790			23,155			107,292
Cost of equity method investments	(8,576		)	(21,849		)	(16,081		)
Change in restricted cash and cash equivalents	93,370			62,324			264,701
Additions to property and equipment	(63,674		)	(79,755		)	(82,132		)
Acquisitions, net of cash acquired	(7,527		)	(261,521		)	(319,086		)
Other	(1,348		)	(797		)	(2,368		)
Net Cash Provided (Used) By Investing Activities	(1,545,111		)	125,773			(622,205		)
FINANCING ACTIVITIES
Additions to senior long-term debt and other debt	559,300			69,797			89,480
Repayment and retirement of senior long-term debt and other debt	(278,363		)	(88,020		)	(83,722		)
Premiums and fees related to early extinguishment of debt	(43,691		)	—			—
Repurchases of common stock	(51,142		)	(31,491		)	(26,053		)
Issuance of common stock	4,623			4,752			5,691
Payment of contingent consideration	(14,219		)	(9,263		)	(2,766		)
Purchase of redeemable noncontrolling interests	(3,167		)	(12,474		)	(25,918		)
Distributions to noncontrolling interests	(5,949		)	(6,287		)	(5,245		)
Other	(15,373		)	(1,225		)	(18,591		)
Net Cash Provided (Used) By Financing Activities	152,019			(74,211		)	(67,124		)
Effect of foreign currency rate changes on cash and cash equivalents	(32,793		)	(32,873		)	(45,820		)
Increase (decrease) in cash and cash equivalents	(891,262		)	669,840			(18,357		)
Cash and cash equivalents at beginning of year	2,630,009			1,960,169			1,978,526
CASH AND CASH EQUIVALENTS AT END OF YEAR	$	1,738,747		$	2,630,009		$	1,960,169

See accompanying notes to consolidated financial statements.

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MARKEL CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1. Summary of Significant Accounting Policies

Markel Corporation is a diverse financial holding company serving a variety of niche markets. Markel Corporation's principal business markets and underwrites specialty insurance products. Through its wholly owned subsidiary, Markel Ventures, Inc. (Markel Ventures), Markel Corporation also owns interests in various industrial and service businesses that operate outside of the specialty insurance marketplace.

a)Basis of Presentation. The accompanying consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (U.S. GAAP) and include the accounts of Markel Corporation and its consolidated subsidiaries, as well as any variable interest entities (VIEs) that meet the requirements for consolidation (the Company). All significant intercompany balances and transactions have been eliminated in consolidation. The Company consolidates the results of its Markel Ventures subsidiaries on a one-month lag. Certain prior year amounts have been reclassified to conform to the current presentation.

b)Use of Estimates. The preparation of financial statements in accordance with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses and the disclosure of contingent assets and liabilities. Management periodically reviews its estimates and assumptions. Quarterly reviews include evaluating the adequacy of reserves for unpaid losses and loss adjustment expenses, life and annuity reinsurance benefit reserves, litigation contingencies, the reinsurance allowance for doubtful accounts and income tax liabilities, as well as analyzing the recoverability of deferred tax assets, estimating reinsurance premiums written and earned and evaluating the investment portfolio for other-than-temporary declines in estimated fair value. Estimates and assumptions for goodwill and intangible assets are reviewed in conjunction with an acquisition, and goodwill and indefinite-lived intangible assets are reassessed at least annually for impairment. Actual results may differ materially from the estimates and assumptions used in preparing the consolidated financial statements.

c)Investments. Available-for-sale investments are recorded at estimated fair value. Unrealized gains and losses on investments, net of income taxes, are included in accumulated other comprehensive income in shareholders' equity. The Company completes a detailed analysis each quarter to assess whether the decline in the fair value of any investment below its cost basis is deemed other-than-temporary.

Premiums and discounts are amortized or accreted over the lives of the related fixed maturities as an adjustment to the yield using the effective interest method. Dividend and interest income are recognized when earned. Realized investment gains or losses are included in earnings. Realized gains or losses from sales of investments are derived using the first-in, first-out method.

The Company also has certain investments in fixed maturity and equity securities that are recorded at estimated fair value with changes in unrealized gains and losses recorded in net income. These fixed maturity and equity security investments totaled $41.4 million and $191.2 million, respectively, as of December 31, 2016 and are included in fixed maturities and equity securities in the consolidated balance sheets.

Investments accounted for under the equity method of accounting are recorded at cost within other assets on the consolidated balance sheets and subsequently increased or decreased by the Company's proportionate share of the net income or loss of the investee. The Company records its proportionate share of net income or loss of the investee in net investment income. The Company records its proportionate share of other comprehensive income or loss of the investee as a component of other comprehensive income (loss). Dividends or other equity distributions are recorded as a reduction of the investment. The Company reviews equity method investments for impairment when events or circumstances indicate that a decline in the fair value of the investment below its carrying value is other-than-temporary.

d)Cash and Cash Equivalents. The Company considers all investments with original maturities of 90 days or less to be cash equivalents. The carrying value of the Company's cash and cash equivalents and restricted cash and cash equivalents approximates fair value.

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e)Receivables. Receivables include amounts receivable from agents, brokers and insureds, which represent premiums that are both currently due and amounts not yet due on insurance and reinsurance policies. Premiums for insurance policies are generally due at inception. Premiums for reinsurance policies generally become due over the period of coverage based on the policy terms. The Company monitors the credit risk associated with premiums receivable, taking into consideration the fact that in certain instances credit risk may be reduced by the Company's right to offset loss obligations or unearned premiums against premiums receivable. Amounts deemed uncollectible are charged to net income in the period they are determined. Changes in the estimate of reinsurance premiums written will result in an adjustment to premiums receivable in the period they are determined.

f)Reinsurance Recoverables. Amounts recoverable from reinsurers are estimated in a manner consistent with the claim liability associated with the reinsured business. Allowances are established for amounts deemed uncollectible and reinsurance recoverables are recorded net of these allowances. The Company evaluates the financial condition of its reinsurers and monitors concentration risk to minimize its exposure to significant losses from individual reinsurers.

g)Deferred Policy Acquisition Costs. Costs directly related to the acquisition of insurance premiums are deferred and amortized over the related policy period, generally one year. The Company only defers acquisition costs incurred that are related directly to the successful acquisition of new or renewal insurance contracts, including commissions to agents and brokers and premium taxes. Commissions received related to reinsurance premiums ceded are netted against broker commissions in determining acquisition costs eligible for deferral. To the extent that future policy revenues on existing policies are not adequate to cover related costs and expenses, deferred policy acquisition costs are charged to earnings. The Company does not consider anticipated investment income in determining whether a premium deficiency exists.

h)Goodwill and Intangible Assets. Goodwill and intangible assets are recorded as a result of business acquisitions. Goodwill represents the excess of the amount paid to acquire a business over the net fair value of assets acquired and liabilities assumed at the date of acquisition. Indefinite-lived and other intangible assets are recorded at fair value as of the acquisition date. The determination of the fair value of certain assets acquired and liabilities assumed involves significant judgment and the use of valuation models and other estimates, which require assumptions that are inherently subjective. Goodwill and indefinite-lived intangible assets are tested for impairment at least annually. The Company completes an annual test during the fourth quarter of each year based upon the results of operations through September 30. Intangible assets with definite lives are amortized using the straight-line method over their estimated useful lives, generally five to 20 years, and are reviewed for impairment when events or circumstances indicate that their carrying value may not be recoverable.

i)Property and Equipment. Property and equipment are stated at cost less accumulated depreciation and amortization. Depreciation and amortization of property and equipment are calculated using the straight-line method over the estimated useful lives (generally, the lower of the life of the lease or the estimated useful life for leasehold improvements, ten to 40 years for buildings, seven to 40 years for land improvements, three to ten years for furniture and equipment and three to 25 years for other property and equipment).

j)Redeemable Noncontrolling Interests. The Company owns controlling interests in various companies through its Markel Ventures operations. In some cases, the Company has the option to acquire the remaining equity interests, and the remaining equity interests have the option to sell their interests to the Company, in the future. The redemption value of the remaining equity interests is generally based on the respective company's earnings in specified periods preceding the redemption date. The redeemable noncontrolling interests generally become redeemable through 2020.

The Company recognizes changes in the redemption value that exceed the carrying value of redeemable noncontrolling interests to retained earnings as if the balance sheet date were also the redemption date. Changes in the redemption value also result in an adjustment to net income to shareholders in the calculation of basic and diluted net income per share. The change in the redemption value of redeemable noncontrolling interests in 2016, 2015 and 2014 resulted in an adjustment to retained earnings of a decrease of $15.5 million, an increase of $4.1 million, and a decrease of $8.2 million, respectively.

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k)Income Taxes. The Company records deferred income taxes to reflect the net tax effect of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and their tax bases. Deferred tax assets are reduced by a valuation allowance when management believes it is more likely than not that some, or all, of the deferred tax assets will not be realized. The Company recognizes the tax benefit from an uncertain tax position taken or expected to be taken in income tax returns only if it is more likely than not that the tax position will be sustained upon examination by tax authorities, based on the technical merits of the position. Tax positions that meet the more likely than not threshold are then measured using a probability weighted approach, whereby the largest amount of tax benefit that is greater than 50% likely of being realized upon ultimate settlement is recognized. The Company recognizes interest and penalties related to uncertain tax positions in income tax expense.

l)Unpaid Losses and Loss Adjustment Expenses. Unpaid losses and loss adjustment expenses on our property and casualty insurance business are based on evaluations of reported claims and estimates for losses and loss adjustment expenses incurred but not reported. Estimates for losses and loss adjustment expenses incurred but not reported are based on reserve development studies, among other things. The Company does not discount reserves for losses and loss adjustment expenses to reflect estimated present value, except for reserves assumed in connection with an acquisition, which are recorded at fair value at the acquisition date. Recorded reserves are estimates, and the ultimate liability may be greater or less than the estimates.

m)Life and Annuity Benefits. The Company previously acquired a block of long duration reinsurance contracts for life and annuity benefits which subject the Company to mortality, longevity and morbidity risks. The assumptions used to determine policy benefit reserves are generally locked-in for the life of the contract unless an unlocking event occurs. To the extent existing policy reserves, together with the present value of future gross premiums and expected investment income earned thereon, are not adequate to cover the present value of future benefits, settlement and maintenance costs, the locked-in assumptions are revised to current best estimate assumptions and a charge to earnings for life and annuity benefits is recognized at that time. Because of the assumptions and estimates used in establishing reserves for life and annuity benefit obligations and the long-term nature of these reinsurance contracts, the ultimate liability may be greater or less than the estimates.

Results attributable to the run-off of life and annuity reinsurance business are included in other revenues and other expenses in the Company's consolidated statements of income and comprehensive income and as part of the Company's Other Insurance (Discontinued Lines) segment.

n)Revenue Recognition.

Property and Casualty Premiums

Insurance premiums are generally earned on a pro rata basis over the policy period, typically one year. The cost of reinsurance ceded is initially recorded as prepaid reinsurance premiums and is amortized over the reinsurance contract period in proportion to the amount of insurance protection provided. Premiums ceded are netted against premiums written.

Assumed reinsurance premiums are recorded at the inception of each contract based upon contract terms and information received from cedents and brokers and are earned on a pro rata basis over the coverage period, or for multi-year contracts, in proportion with the underlying risk exposure to the extent there is variability in the exposure through the coverage period. Changes in reinsurance premium estimates are expected and may result in significant adjustments in any period. These estimates change over time as additional information regarding changes in underlying exposures is obtained. Any subsequent differences arising on such estimates are recorded as premiums written in the period they are determined and are earned on a pro rata basis over the coverage period. The Company uses the periodic method to account for assumed reinsurance from foreign reinsurers. The Company's foreign reinsurers provide sufficient information to record foreign assumed business in the same manner as the Company records assumed business from United States reinsurers.

Certain contracts that the Company writes provide for reinstatement of coverage. Reinstatement premiums are the premiums for the restoration of the insurance or reinsurance limit of a contract to its full amount after a loss occurrence by the insured or reinsured. The Company accrues for reinstatement premiums resulting from losses recorded. Such accruals are based upon contractual terms and management judgment is involved with respect to the amount of losses recorded. Changes in estimates of losses recorded on contracts with reinstatement premium features will result in changes in reinstatement premiums based on contractual terms. Reinstatement premiums are recognized at the time losses are recorded and are earned on a pro-rata basis over the coverage period.

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Other Revenues

Other revenues primarily relate to the Company's Markel Ventures operations and consist of revenues from the sale of manufactured products and service revenues. Revenues from manufactured products are generally recognized at the time title transfers to the customer, which typically occurs at the point of shipment or delivery to the customer, depending on the terms of the sales arrangement. Revenues from services are generally recognized as the services are performed. Services provided pursuant to a contract are recognized either over the contract period or upon completion of the elements specified in the contract, depending on the terms of the contract.

Investment management fee income is recognized over the period in which investment management services are provided and is calculated and billed monthly based on the net asset value of the accounts managed. Performance fee arrangements entitle the Company to participate, on a fixed-percentage basis, in any net income generated in excess of an agreed-upon threshold as established by the underlying investment management agreements. In general, net income is calculated at the end of each calendar year and performance fees are payable annually. Following the preferred method identified in the Accounting Standards Codification (ASC) Topic 605, Revenue Recognition, such performance fee income is recorded at the conclusion of the contractual performance period, when all contingencies are resolved.

o)Stock-based Compensation. Stock-based compensation expense is generally recognized as part of underwriting, acquisition and insurance expenses over the requisite service period. Stock-based compensation expense, net of taxes, was $14.3 million in 2016, $16.3 million in 2015 and $18.7 million in 2014. See note 12.

p)Foreign Currency Translation. The functional currencies of the Company's foreign operations are the currencies in which the majority of their business is transacted. Assets and liabilities of foreign operations are translated into the United States Dollar using the exchange rates in effect at the balance sheet date. Revenues and expenses of foreign operations are translated using the average exchange rate for the period. Gains or losses from translating the financial statements of foreign operations denominated in a functional currency are included, net of taxes, in shareholders' equity as a component of accumulated other comprehensive income. Gains and losses arising from transactions denominated in a foreign currency other than a functional currency are included in net income.

The Company manages its exposure to foreign currency risk primarily by matching assets, other than goodwill and intangible assets, and liabilities denominated in the same currency. To the extent that assets and liabilities in foreign currencies are not matched, the Company is exposed to foreign currency risk. For functional currencies, the related exchange rate fluctuations are reflected in other comprehensive income (loss). The cumulative foreign currency translation adjustment, net of taxes, was a loss of $84.4 million and $72.7 million at December 31, 2016 and 2015, respectively.

q)Derivative Financial Instruments. Derivative instruments, including derivative instruments resulting from hedging activities, are measured at fair value and recognized as either assets or liabilities on the consolidated balance sheets. The changes in fair value of derivatives are recognized in earnings unless the derivative is designated as a hedge and qualifies for hedge accounting.

The Company's foreign currency forward contracts are generally designated and qualify as hedges of a net investment in a foreign operation. The effective portion of the change in fair value resulting from these hedges is reported in currency translation adjustments as part of other comprehensive income (loss). The ineffective portion of the change in fair value is recognized in earnings.

r)Comprehensive Income. Comprehensive income represents all changes in equity that result from recognized transactions and other economic events during the period. Other comprehensive income (loss) refers to revenues, expenses, gains and losses that under U.S. GAAP are included in comprehensive income but excluded from net income, such as unrealized gains or losses on investments, foreign currency translation adjustments and changes in net actuarial pension loss.

s)Net Income Per Share. Basic net income per share is computed by dividing adjusted net income to shareholders by the weighted average number of common shares outstanding during the year. Diluted net income per share is computed by dividing adjusted net income to shareholders by the weighted average number of common shares and dilutive potential common shares outstanding during the year. See note 12(b).

t)Variable Interest Entities. The Company determines whether it has relationships with entities defined as VIEs in accordance with ASC Topic 810, Consolidation. Under this guidance, a VIE is consolidated by the variable interest holder that is determined to be the primary beneficiary.

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An entity in which the Company holds a variable interest is a VIE if any of the following conditions exist: (a) the total equity investment at risk is not sufficient to permit the entity to finance its activities without additional subordinated financial support, (b) as a group, the holders of equity investment at risk lack either the direct or indirect ability through voting rights or similar rights to make decisions about an entity's activities that most significantly impact the entity's economic performance or the obligation to absorb the expected losses or right to receive the expected residual returns, or (c) the voting rights of some investors are disproportionate to their obligation to absorb the expected losses of the entity, their rights to receive the expected residual returns of the entity, or both and substantially all of the entity's activities either involve or are conducted on behalf of an investor with disproportionately few voting rights.

The primary beneficiary is defined as the variable interest holder that is determined to have the controlling financial interest as a result of having both (a) the power to direct the activities of a VIE that most significantly impact the economic performance of the VIE and (b) the obligation to absorb losses or right to receive benefits from the VIE that could potentially be significant to the VIE.

The Company determines whether an entity is a VIE at the inception of our variable interest in the entity and upon the occurrence of certain reconsideration events. The Company continually reassesses whether it is the primary beneficiary of VIEs in which it holds a variable interest.

u)Recent Accounting Pronouncements.

Effective January 1, 2016, the Company adopted Financial Accounting Standards Board (FASB) Accounting Standards Update (ASU) No. 2015-02, Consolidation (Topic 810): Amendments to the Consolidation Analysis, which changes the way reporting enterprises evaluate whether (a) they should consolidate limited partnerships and similar entities, (b) fees paid to a decision maker or service provider are variable interests in a VIE, and (c) variable interests in a VIE held by related parties of the reporting enterprise require the reporting enterprise to consolidate the VIE. It also eliminates the VIE consolidation model based on majority exposure to variability that applied to certain investment companies and similar entities. The ASU also significantly changes how to evaluate voting rights for entities that are not similar to limited partnerships when determining whether the entity is a VIE, which may affect entities for which the decision making rights are conveyed through a contractual arrangement. The adoption of this guidance did not result in any changes to our previous consolidation conclusions.

Effective January 1, 2016, the Company adopted FASB ASU No. 2015-03, Interest-Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs. ASU No. 2015-03 requires that debt issuance costs related to a recognized debt liability be presented on the balance sheet as a direct deduction from the debt liability, similar to the presentation of debt discounts. The cost of issuing debt is no longer recorded as a separate asset on the balance sheet. The amortization of debt issuance costs continues to be included in interest expense. ASU No. 2015-03 was applied retrospectively to all periods presented. As a result, debt issuance costs totaling $2.2 million and $2.6 million were reclassified from other assets to senior long-term debt and other debt as of December 31, 2015 and December 31, 2014, respectively.The adoption of this ASU did not have an impact on the Company's results of operations or cash flows.

Effective January 1, 2016, the Company adopted FASB ASU No. 2015-05, Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer's Accounting for Fees Paid in a Cloud Computing Arrangement, which clarifies that software licenses contained in a cloud computing arrangement should be capitalized if the customer has the right to take possession of the software and the ability to run the software outside of the cloud computing arrangement. The adoption of this ASU did not have an impact on the Company's financial position, results of operations or cash flows.

Effective January 1, 2016, the Company adopted FASB ASU No. 2015-16, Business Combinations (Topic 805): Simplifying the Accounting for Measurement-Period Adjustments. ASU No. 2015-16 eliminates the requirement to retrospectively adjust the financial statements for measurement-period adjustments that occur in periods after a business combination is consummated. The adoption of this ASU did not have an impact on the Company's financial position, results of operations or cash flows and will be applied on a prospective basis, as applicable.

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During the second quarter of 2016, the Company early adopted FASB ASU No. 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting, which changes several aspects of the accounting for share-based payment award transactions. Under the new guidance, all excess tax benefits or deficiencies associated with share-based payment award transactions are required to be recognized as an income tax benefit or expense in net income when the awards vest or are settled, with the corresponding cash flows recognized as an operating activity in the statement of cash flows. Excess tax benefits and deficiencies are no longer recognized in additional paid-in-capital. The new guidance also allows an employer to repurchase more of an employee's shares for tax witholding purposes without triggering liability accounting and to make a policy election to account for forfeitures as they occur, rather than estimating forfeitures upon issuance of the award. Upon adoption of ASU No. 2016-09, the Company elected to account for forfeitures as they occur, which had no impact on the consolidated financial statements. The provisions of ASU No. 2016-09 were adopted as of January 1, 2016 on a prospective basis and did not have a material impact on the Company's financial position, results of operations or cash flows.

Effective for the year ended December 31, 2016, the Company adopted FASB ASU No. 2015-09, Financial Services-Insurance (Topic 944): Disclosures about Short-Duration Contracts. ASU No. 2015-09 requires significant new disclosures for insurers relating to short-duration insurance contract claims and the unpaid claims liability rollforward for long and short-duration contracts. The guidance requires annual tabular disclosure, on a disaggregated basis, of undiscounted incurred and paid claim and allocated claim adjustment expense development by accident year, net of reinsurance, for up to 10 years. Tables must also include the total incurred but not reported claims liabilities, plus expected development on reported claims, and claims frequency for each accident year. A description of estimation methodologies and any significant changes in methodologies and assumptions used to calculate the liability and frequency is also required. Based on the disaggregated claims information in the tables, disclosure of historical average annual percentage payout of incurred claims is also required. The ASU requires retrospective application by providing comparative disclosures for each period presented, other than those that are only required for the most recent reporting period. These new annual disclosures have been included in note 9. Interim period disclosures must include a tabular rollforward and related qualitative information for the liability for unpaid losses and loss adjustment expenses. The interim disclosures are required beginning in the first quarter of 2017.

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), which creates a new comprehensive revenue recognition standard that will serve as a single source of revenue guidance for all companies in all industries. The guidance applies to all companies that either enter into contracts with customers to transfer goods or services or enter into contracts for the transfer of nonfinancial assets, unless those contracts are within the scope of other standards, such as insurance contracts. ASU No. 2014-09's core principle is that a company will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. In doing so, companies will need to use more judgment and make more estimates than under the current guidance. These may include identifying performance obligations in the contract, estimating the amount of variable consideration to include in the transaction price and allocating the transaction price to each separate performance obligation. ASU No. 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Consideration (Reporting Revenue Gross versus Net), ASU No. 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing, ASU No. 2016-12, Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients and ASU No. 2016-20, Technical Corrections and Improvements to Topic 606, Revenue from Contracts with Customers were all issued in 2016 as amendments to ASU No. 2014-09. These amendments will be evaluated and adopted in conjunction with ASU No. 2014-09. The Company expects to adopt ASU No. 2014-09 as of January 1, 2018 using the modified retrospective method, whereby the cumulative effect of adoption will be recognized at the date of initial application. The adoption of this ASU will not impact the Company's insurance premium revenues or revenues from its investment portfolio, which totaled 77% of consolidated revenues for the year ended December 31, 2016, but will impact the Company's other revenues, which are primarily attributable to its non-insurance operations. The Company has completed an inventory of revenue streams from its non-insurance operations, which are comprised of a diverse portfolio of contracts across various industries, and is currently evaluating changes, if any, that will be necessary. The Company has not determined the full impact that adopting the new accounting guidance will have on its consolidated financial statements.

In July 2015, the FASB issued ASU No. 2015-11, Inventory (Topic 330): Simplifying the Measurement of Inventory. The ASU changes the measurement principle for inventory from the lower of cost or market to lower of cost and net realizable value and eliminates the requirement to consider replacement cost or net realizable value less an approximately normal profit margin when measuring inventory. ASU No. 2015-11 becomes effective for the Company during the first quarter of 2017 and will be applied prospectively. Adoption of this ASU is not expected to have a material impact on the Company's financial position, results of operations or cash flows.

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In January 2016, the FASB issued ASU No. 2016-01, Financial Instruments (Topic 825): Recognition and Measurement of Financial Assets and Financial Liabilities. The ASU significantly changes the income statement impact of equity investments and the recognition of changes in fair value of financial liabilities attributable to an entity's own credit risk when the fair value option is elected. The ASU requires equity instruments that do not result in consolidation and are not accounted for under the equity method to be measured at fair value and to recognize any changes in fair value in net income rather than other comprehensive income (loss). ASU No. 2016-01 becomes effective for the Company during the first quarter of 2018 and will be applied using a cumulative-effect adjustment to retained earnings as of the beginning of the fiscal year of adoption. The provisions related to equity investments without a readily determinable fair value will be applied prospectively to equity investments as of the adoption date. The Company is currently evaluating ASU No. 2016-01 to determine the impact that adopting this standard will have on the consolidated financial statements. Adoption of this ASU is not expected to have a material impact on the Company's financial position, cash flows, or total comprehensive income, but will have a material impact on the Company's results of operations as changes in fair value of equity instruments will be presented in net income rather than other comprehensive income (loss). As of December 31, 2016, accumulated other comprehensive income included $1.5 billion of net unrealized gains on equity securities, net of taxes. See note 3(f) for details regarding the change in net unrealized gains on equity securities included in other comprehensive income (loss) for the years ended December 31, 2016, 2015 and 2014.

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). The ASU requires lessees to record most leases on their balance sheets as a lease liability with a corresponding right-of-use asset, but continue to recognize the related leasing expense within net income. The guidance also eliminates real estate-specific provisions for all entities. For lessors, the guidance modifies the classification criteria and the accounting for sales-type and direct financing leases. ASU No. 2016-02 becomes effective for the Company during the first quarter of 2019 and will be applied under a modified retrospective approach for leases that exist or are entered into after the beginning of the earliest comparative period in the financial statements. See note 16 for details regarding the Company's minimum annual rental commitments payable directly by the Company for noncancelable operating leases at December 31, 2016, which will be subject to this new guidance. The calculation of the lease liability and right-of-use asset requires further analysis of the underlying leases to determine which portion of the underlying lease payments are required to be included in the calculation. The Company is currently evaluating ASU No. 2016-02 to determine the potential impact that adopting this standard will have on its consolidated financial statements.

In March 2016, the FASB issued ASU No. 2016-07, Investments - Equity Method and Joint Ventures (Topic 323): Simplifying the Transition to the Equity Method of Accounting. The ASU eliminates the requirement for an investor to retroactively apply the equity method when its increase in ownership interest or degree of influence in an investee triggers equity method accounting. ASU No. 2016-07 becomes effective for the Company during the first quarter of 2017 and will be applied prospectively. Early adoption is permitted. Adoption of this ASU is not expected to have an impact on the Company's financial position, results of operations or cash flows.

In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The ASU replaces the current incurred loss model used to measure impairment losses with an expected loss model for trade, reinsurance, and other receivables as well as financial instruments measured at amortized cost. For available-for-sale debt securities, which are measured at fair value, the ASU requires entities to record impairments as an allowance, rather than a reduction of the amortized cost, as is currently required under the other-than-temporary impairment model. ASU No. 2016-13 becomes effective for the Company during the first quarter of 2020 and will be applied using a modified-retrospective approach through a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective. The Company is currently evaluating ASU No. 2016-13 to determine the potential impact that adopting this standard will have on the consolidated financial statements. Application of the new expected loss model for measuring impairment losses will not impact the Company's investment portfolio, all of which is considered available-for sale, but will impact the Company's other financial assets, including its reinsurance recoverables. Upon adoption of this ASU, any impairment losses on the Company's available-for-sale debt securities will be recorded as an allowance, subject to reversal, rather than as a reduction in amortized cost.

46

In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments, which is intended to reduce diversity in practice in how certain transactions are classified in the statement of cash flows. Some of the topics covered by the ASU include the classification of debt prepayment and extinguishment costs, contingent consideration payments made after a business combination and distributions from equity method investees. ASU No. 2016-15 becomes effective for the Company during the first quarter of 2018 and will be applied using a retrospective transition approach. Early adoption is permitted. The Company is currently evaluating ASU No. 2016-15 to determine the potential impact that adopting this standard will have on the consolidated statements of cash flows. Adoption of this ASU will not impact the Company's financial position or results of operations and is not expected to have a material impact on the Company's consolidated statements of cash flows.

In October 2016, the FASB issued ASU No. 2016-16, Income Taxes (Topic 740): Intra-entity Transfers of Assets Other Than Inventory, which will require companies to account for the income tax effects of intercompany transfers of assets other than inventory when the transfer occurs. Intercompany transfers of assets across tax jurisdictions may have cash tax consequences and may be taxable events as proscribed by the applicable tax jurisdiction. Currently, companies are prohibited from recognizing those tax effects until the asset has been sold to an outside party. The income tax effects of intercompany inventory transactions will continue to be deferred. ASU No. 2016-16 becomes effective for the Company during the first quarter of 2018 and will be applied using a modified retrospective transition approach. Early adoption is permitted. Adoption of this ASU will not impact the Company's cash flows and is not expected to have a material impact on the Company's financial position or results of operations.

In October 2016, the FASBissuedASU No. 2016-17, Consolidation (Topic 810): Interests Held through Related Parties That Are under Common Control, which will require a single decision maker evaluating whether it is the primary beneficiary of a VIE to consider its indirect interests held by related parties that are under common control on a proportionate basis. Under the guidance the FASB issued last year, which was adopted by the Company effective January 1, 2016, the decision maker was required to consider those interests in their entirety. ASU No. 2016-17 becomes effective for the Company beginning in 2017 and will be applied retrospectively to 2016, the fiscal year in which the amendments in Update 2015-02 initially were applied, as described above. Adoption of this guidance is not expected to result in any changes to our previous consolidation conclusions.

In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash. The ASU requires that a statement of cash flows explain the change during the period of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. Currently, changes in restricted cash and cash equivalents are presented as operating, investing or financing activities on the statement of cash flows. ASU No. 2016-18 becomes effective for the Company during the first quarter of 2018 and will be applied using a retrospective approach for each period presented. The Company currently presents changes in restricted cash and cash equivalents on the face of the statements of cash flows as an investing activity. Upon adoption of this ASU, the Company's statements of cash flows will include restricted cash and cash equivalents in the beginning-of-period and end-of-period total amounts for cash, cash equivalents and restricted cash and cash equivalents. Adoption of this ASU will not impact the Company's financial position, results of operations or total comprehensive income (loss).

In January 2017, the FASB issued ASU No. 2017-04, Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. The ASU eliminates Step 2 of the goodwill impairment test, which is performed by estimating the fair value of individual assets and liabilities of the reporting unit to calculate the implied fair value of goodwill. Instead, an entity will record a goodwill impairment charge based on the excess of a reporting unit's carrying value over its estimated fair value, not to exceed the carrying amount of goodwill. ASU No. 2017-04 becomes effective for the Company during the first quarter of 2020 and will be applied prospectively. Early adoption is permitted. Adoption of this ASU is not expected to have a material impact on the Company's financial position, results of operations or cash flows.

47

2. Acquisitions

CATCo Investment Management Acquisition

In December 2015, the Company completed the acquisition of substantially all of the assets of CATCo Investment Management Ltd. (CATCo IM) and CATCo-Re Ltd. CATCo IM was a leading insurance-linked securities investment fund manager and reinsurance manager headquartered in Bermuda focused on building and managing highly diversified, collateralized retrocession and reinsurance portfolios covering global property catastrophe risks. Results attributable to Markel CATCo Investment Management Ltd. (MCIM), the wholly owned subsidiary formed in conjunction with this transaction, are included with the Company's non-insurance operations, which are not included in a reportable segment.

Total consideration for the acquisition was $205.7 million, all of which was cash. The purchase price was allocated to the acquired assets and liabilities based on estimated fair values at the acquisition date. The Company recognized goodwill of $91.9 million, all of which is expected to be deductible for income tax purposes. The goodwill is primarily attributable to the Company's ability to achieve continued capital growth in excess of that which can be expected for the investment funds previously managed by CATCo IM. The Company also recognized other intangible assets of $113.0 million, primarily related to its investment management agreements. These intangible assets are expected to be amortized over a weighted average period of 14 years.

In connection with the acquisition, the Company instituted performance incentive and retention arrangements for former CATCo employees, whom are now employed by MCIM. Pursuant to these agreements, the Company committed to the payment of performance bonuses derived from the results of the business in 2016 through 2018 and retention bonuses that will be paid annually over the three year period following the acquisition. The total amount of these payments is currently estimated to be $105 million, of which $33.2 million was recognized as compensation expense for the year ended December 31, 2016. The balance will be recognized in the consolidated financial statements as post-acquisition compensation expense over the remaining performance period and as services are provided.

Markel Ventures Acquisitions

In December 2015, the Company acquired 80% of the outstanding shares of CapTech Ventures, Inc. (CapTech), a privately held company headquartered in Richmond, Virginia. CapTech is a management and IT consulting firm, providing services and solutions to a wide array of customers. Under the terms of the acquisition agreement for CapTech, the Company has the option to acquire the remaining equity interests and the remaining equity interests have the option to sell their interests to the Company in the future. The redemption value of the remaining equity interests is generally based on CapTech's earnings in specified periods preceding the redemption date.

Total consideration for the CapTech acquisition was $60.6 million. Total consideration included the estimated fair value of contingent consideration we expected to pay based on CapTech's earnings, as defined in the stock purchase agreement, through 2018. The purchase price was preliminarily allocated to the acquired assets and liabilities based on the estimated fair values at the acquisition date. During 2016, the Company completed the process of determining the fair value of the assets and liabilities acquired with CapTech. There were no material adjustments to the provisional estimates recorded as of December 31, 2015. The Company recognized goodwill of $50.6 million related to this acquisition, none of which is expected to be deductible for income tax purposes. The Company also recognized other intangible assets of $49.2 million, primarily related to customer relationships, and redeemable noncontrolling interests of $13.8 million. These intangible assets are expected to be amortized over a weighted average period of 14 years. Results attributable to this acquisition are included with the Company's non-insurance operations, which are not included in a reportable segment.

In July 2014, the Company acquired 100% of the outstanding shares of Cottrell, Inc. (Cottrell), a privately held company headquartered in Gainesville, Georgia. Cottrell is a leading manufacturer of over-the-road car hauler equipment and related car hauler parts. In June and August 2014, ParkLand Ventures, Inc. (ParkLand) also completed the acquisition of several manufactured housing communities. Total consideration for these acquisitions was $187.0 million, which primarily consisted of cash consideration. Total consideration included the estimated fair value of contingent consideration we expected to pay based on Cottrell's earnings, as defined in the stock purchase agreement, in 2014 and 2015. The Company recognized goodwill of $38.7 million related to these acquisitions, the majority of which we expect to amortize for income tax purposes. The Company also recognized other intangible assets of $78.7 million, including $53.7 million of customer relationships and $13.0 million of trade names, which are expected to be amortized over a weighted average period of 17 years and 10 years, respectively. Results attributable to these acquisitions are included with the Company's non-insurance operations, which are not included in a reportable segment.

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Acquisition of Abbey Protection

In January 2014, the Company completed its acquisition of 100% of the share capital of Abbey Protection plc (Abbey), an integrated specialty insurance and consultancy group headquartered in London. Abbey's business is focused on the underwriting and sale of insurance products to small and medium-sized enterprises and affinity groups in the United Kingdom providing protection against legal expenses and professional fees incurred as a result of legal actions or investigations by tax authorities, as well as providing a range of complementary legal and professional consulting services. Results attributable to Abbey's insurance operations are included in the International Insurance segment. Results attributable to Abbey's consultancy operations are reported with the Company's non-insurance operations, which are not included in a reportable segment.

Total consideration for this acquisition was $190.7 million, all of which was cash consideration. The purchase price was allocated to the acquired assets and liabilities based on estimated fair values at the acquisition date. The Company recognized goodwill of $65.8 million, of which $43.0 million was allocated to the International Insurance segment and $22.8 million was allocated to the Company's non-insurance operations. None of the goodwill recognized is expected to be deductible for income tax purposes. The goodwill is primarily attributable to Abbey's assembled workforce and synergies that are expected to result upon integration of Abbey into the Company's insurance operations. The Company also recognized other intangible assets of $113.4 million, including $103.5 million of customer relationships and $9.9 million of trade names. These intangible assets are expected to be amortized over 20 years and 14 years, respectively.

Subsequent Event

On February 1, 2017, the Company entered into a definitive merger agreement to acquire SureTec Financial Corp. (SureTec) for approximately $250 million. SureTec is a Texas-based privately held surety company primarily offering contract, commercial and court bonds. The transaction is subject to customary closing conditions, including insurance regulatory approvals, and is expected to close in the first half of 2017. Upon completion of the acquisition, SureTec's operating results will be included in the Company's U.S. Insurance segment.

49

3. Investments

a)The following tables summarize the Company's available-for-sale investments. Commercial and residential mortgage-backed securities include securities issued by U.S. government-sponsored enterprises and U.S. government agencies.

	December 31, 2016
(dollars in thousands)	Amortized Cost		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses			Unrealized Other- Than-Temporary Impairment Losses			Estimated Fair Value
Fixed maturity securities:
U.S. Treasury	$	259,379	$	99	$	(894	)	$	—		$	258,584
U.S. government-sponsored enterprises	418,457		9,083		(4,328		)	—			423,212
Obligations of states, municipalities and political subdivisions	4,324,332		145,678		(41,805		)	—			4,428,205
Foreign governments	1,306,324		159,291		(2,153		)	—			1,463,462
Commercial mortgage-backed	1,055,947		3,953		(19,544		)	—			1,040,356
Residential mortgage-backed	779,503		18,749		(5,048		)	(2,258		)	790,946
Asset-backed	27,494		2		(158		)	—			27,338
Corporate	1,420,298		49,146		(9,364		)	(673		)	1,459,407
Total fixed maturity securities	9,591,734		386,001		(83,294		)	(2,931		)	9,891,510
Equity securities:
Insurance, banks and other financial institutions	846,343		857,063		(5,596		)	—			1,697,810
Industrial, consumer and all other	1,635,105		1,421,080		(8,154		)	—			3,048,031
Total equity securities	2,481,448		2,278,143		(13,750		)	—			4,745,841
Short-term investments	2,336,100		57		(6		)	—			2,336,151
Investments, available-for-sale	$	14,409,282	$	2,664,201	$	(97,050	)	$	(2,931	)	$	16,973,502
	December 31, 2015
(dollars in thousands)	Amortized Cost		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses			Unrealized Other- Than-Temporary Impairment Losses			Estimated Fair Value
Fixed maturity securities:
U.S. Treasury	$	310,370	$	95	$	(1,048	)	$	—		$	309,417
U.S. government-sponsored enterprises	385,282		9,741		(3,733		)	—			391,290
Obligations of states, municipalities and political subdivisions	3,817,136		204,302		(8,225		)	—			4,013,213
Foreign governments	1,302,329		115,809		(1,681		)	—			1,416,457
Commercial mortgage-backed	657,670		6,867		(4,999		)	—			659,538
Residential mortgage-backed	837,964		22,563		(4,022		)	(2,258		)	854,247
Asset-backed	36,462		15		(406		)	—			36,071
Corporate	1,690,945		41,123		(16,209		)	(1,624		)	1,714,235
Total fixed maturity securities	9,038,158		400,515		(40,323		)	(3,882		)	9,394,468
Equity securities:
Insurance, banks and other financial institutions	651,002		690,271		(6,551		)	—			1,334,722
Industrial, consumer and all other	1,557,832		1,227,052		(45,131		)	—			2,739,753
Total equity securities	2,208,834		1,917,323		(51,682		)	—			4,074,475
Short-term investments	1,642,103		167		(9		)	—			1,642,261
Investments, available-for-sale	$	12,889,095	$	2,318,005	$	(92,014	)	$	(3,882	)	$	15,111,204

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b)The following tables summarize gross unrealized investment losses by the length of time that securities have continuously been in an unrealized loss position.

	December 31, 2016
	Less than 12 months					12 months or longer					Total
(dollars in thousands)	Estimated Fair Value		Gross  Unrealized Holding and  Other-Than- Temporary Impairment Losses			Estimated Fair Value		Gross  Unrealized Holding and  Other-Than- Temporary Impairment Losses			Estimated Fair Value		Gross  Unrealized Holding and  Other-Than- Temporary Impairment Losses
Fixed maturity securities:
U.S. Treasury	$	122,950	$	(894	)	$	—	$	—		$	122,950	$	(894	)
U.S. government-sponsored enterprises	220,333		(4,324		)	7,618		(4		)	227,951		(4,328		)
Obligations of states, municipalities and political subdivisions	1,004,947		(37,685		)	31,723		(4,120		)	1,036,670		(41,805		)
Foreign governments	68,887		(2,145		)	5,005		(8		)	73,892		(2,153		)
Commercial mortgage-backed	749,889		(19,091		)	29,988		(453		)	779,877		(19,544		)
Residential mortgage-backed	181,557		(4,987		)	79,936		(2,319		)	261,493		(7,306		)
Asset-backed	14,501		(106		)	5,869		(52		)	20,370		(158		)
Corporate	494,573		(8,357		)	93,790		(1,680		)	588,363		(10,037		)
Total fixed maturity securities	2,857,637		(77,589		)	253,929		(8,636		)	3,111,566		(86,225		)
Equity securities:
Insurance, banks and other financial institutions	8,808		(410		)	37,973		(5,186		)	46,781		(5,596		)
Industrial, consumer and all other	98,406		(4,772		)	29,650		(3,382		)	128,056		(8,154		)
Total equity securities	107,214		(5,182		)	67,623		(8,568		)	174,837		(13,750		)
Short-term investments	504,211		(6		)	—		—			504,211		(6		)
Total	$	3,469,062	$	(82,777	)	$	321,552	$	(17,204	)	$	3,790,614	$	(99,981	)

At December 31, 2016, the Company held 654 securities with a total estimated fair value of $3.8 billion and gross unrealized losses of $100.0 million. Of these 654 securities, 109 securities had been in a continuous unrealized loss position for one year or longer and had a total estimated fair value of $321.6 million and gross unrealized losses of $17.2 million. Of these securities, 93 securities were fixed maturity securities and 16 were equity securities. The Company does not intend to sell or believe it will be required to sell these fixed maturity securities before recovery of their amortized cost. The Company has the ability and intent to hold these equity securities for a period of time sufficient to allow for the anticipated recovery of their fair value.

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	December 31, 2015
	Less than 12 months					12 months or longer					Total
(dollars in thousands)	Estimated Fair Value		Gross  Unrealized Holding and  Other-Than- Temporary Impairment Losses			Estimated Fair Value		Gross  Unrealized Holding and  Other-Than- Temporary Impairment Losses			Estimated Fair Value		Gross  Unrealized Holding and  Other-Than- Temporary Impairment Losses
Fixed maturity securities:
U.S. Treasury	$	301,300	$	(962	)	$	7,426	$	(86	)	$	308,726	$	(1,048	)
U.S. government-sponsored enterprises	125,703		(2,686		)	85,126		(1,047		)	210,829		(3,733		)
Obligations of states, municipalities and political subdivisions	169,362		(4,864		)	70,101		(3,361		)	239,463		(8,225		)
Foreign governments	51,328		(249		)	40,345		(1,432		)	91,673		(1,681		)
Commercial mortgage-backed	289,058		(3,600		)	95,843		(1,399		)	384,901		(4,999		)
Residential mortgage-backed	78,814		(2,858		)	137,100		(3,422		)	215,914		(6,280		)
Asset-backed	6,228		(54		)	24,315		(352		)	30,543		(406		)
Corporate	470,694		(9,509		)	343,737		(8,324		)	814,431		(17,833		)
Total fixed maturity securities	1,492,487		(24,782		)	803,993		(19,423		)	2,296,480		(44,205		)
Equity securities:
Insurance, banks and other financial institutions	63,873		(6,384		)	6,247		(167		)	70,120		(6,551		)
Industrial, consumer and all other	344,857		(44,879		)	2,907		(252		)	347,764		(45,131		)
Total equity securities	408,730		(51,263		)	9,154		(419		)	417,884		(51,682		)
Short-term investments	129,473		(9		)	—		—			129,473		(9		)
Total	$	2,030,690	$	(76,054	)	$	813,147	$	(19,842	)	$	2,843,837	$	(95,896	)

At December 31, 2015, the Company held 659 securities with a total estimated fair value of $2.8 billion and gross unrealized losses of $95.9 million. Of these 659 securities, 271 securities had been in a continuous unrealized loss position for one year or longer and had a total estimated fair value of $813.1 million and gross unrealized losses of $19.8 million. Of these securities, 264 securities were fixed maturity securities and seven were equity securities.

The Company completes a detailed analysis each quarter to assess whether the decline in the fair value of any investment below its cost basis is deemed other-than-temporary. All securities with unrealized losses are reviewed. The Company considers many factors in completing its quarterly review of securities with unrealized losses for other-than-temporary impairment, including the length of time and the extent to which fair value has been below cost and the financial condition and near-term prospects of the issuer. For equity securities, the ability and intent to hold the security for a period of time sufficient to allow for anticipated recovery is considered. For fixed maturity securities, the Company considers whether it intends to sell the security or if it is more likely than not that it will be required to sell the security before recovery, the implied yield-to-maturity, the credit quality of the issuer and the ability to recover all amounts outstanding when contractually due.

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For equity securities, a decline in fair value that is considered to be other-than-temporary is recognized in net income based on the fair value of the security at the time of assessment, resulting in a new cost basis for the security. For fixed maturity securities where the Company intends to sell the security or it is more likely than not that the Company will be required to sell the security before recovery of its amortized cost, a decline in fair value is considered to be other-than-temporary and is recognized in net income based on the fair value of the security at the time of assessment, resulting in a new cost basis for the security. If the decline in fair value of a fixed maturity below its amortized cost is considered to be other-than-temporary based upon other considerations, the Company compares the estimated present value of the cash flows expected to be collected to the amortized cost of the security. The extent to which the estimated present value of the cash flows expected to be collected is less than the amortized cost of the security represents the credit-related portion of the other-than-temporary impairment, which is recognized in net income, resulting in a new cost basis for the security. Any remaining decline in fair value represents the non-credit portion of the other-than-temporary impairment, which is recognized in other comprehensive income (loss). The discount rate used to calculate the estimated present value of the cash flows expected to be collected is the effective interest rate implicit for the security at the date of purchase.

When assessing whether it intends to sell a fixed maturity or if it is likely to be required to sell a fixed maturity before recovery of its amortized cost, the Company evaluates facts and circumstances including decisions to reposition the investment portfolio, potential sales of investments to meet cash flow needs and, ultimately, current market prices.

c)The amortized cost and estimated fair value of fixed maturity securities at December 31, 2016 are shown below by contractual maturity.

(dollars in thousands)	Amortized Cost		Estimated Fair Value
Due in one year or less	$	798,529	$	800,733
Due after one year through five years	1,210,130		1,252,152
Due after five years through ten years	1,582,373		1,659,755
Due after ten years	4,137,758		4,320,230
	7,728,790		8,032,870
Commercial mortgage-backed	1,055,947		1,040,356
Residential mortgage-backed	779,503		790,946
Asset-backed	27,494		27,338
Total fixed maturity securities	$	9,591,734	$	9,891,510

Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties, and the lenders may have the right to put the securities back to the borrower. Based on expected maturities, the estimated average duration of fixed maturity securities at December 31, 2016 was 6.3 years.

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d)The following table presents the components of net investment income.

	Years Ended December 31,
(dollars in thousands)	2016			2015			2014
Interest:
Municipal bonds (tax-exempt)	$	88,654		$	93,580		$	98,262
Municipal bonds (taxable)	65,749			57,550			49,345
Other taxable bonds	144,752			138,763			152,789
Short-term investments, including overnight deposits	11,177			5,223			5,959
Dividends on equity securities	70,577			74,705			65,031
Income (loss) from equity method investments	6,852			(262		)	4,766
Other	2,676			651			2,338
	390,437			370,210			378,490
Investment expenses	(17,207		)	(16,997		)	(15,260		)
Net investment income	$	373,230		$	353,213		$	363,230

e)Cumulative credit losses recognized in net income on fixed maturities where other-than-temporary impairment was identified and a portion of the other-than-temporary impairment was included in other comprehensive income (loss) were $10.7 million at December 31, 2016 and 2015 and $12.7 million at December 31, 2014.

f)The following table presents net realized investment gains and the change in net unrealized gains on investments.

	Years Ended December 31,
(dollars in thousands)	2016			2015			2014
Realized gains:
Sales of fixed maturity securities	$	5,160		$	3,073		$	8,417
Sales of equity securities	70,177			156,987			51,356
Other	1,415			8,103			15,205
Total realized gains	76,752			168,163			74,978
Realized losses:
Sales of fixed maturity securities	(704		)	(4,598		)	(18,136		)
Sales of equity securities	(6,988		)	(1,232		)	(802		)
Other-than-temporary impairments	(18,355		)	(44,481		)	(4,784		)
Other	(2,349		)	(486		)	(15,700		)
Total realized losses	(28,396		)	(50,797		)	(39,422		)
Gains (losses) on securities measured at fair value through net income	16,791			(10,886		)	10,444
Net realized investment gains	$	65,147		$	106,480		$	46,000
Change in net unrealized gains on investments included in other comprehensive income (loss):
Fixed maturity securities	$	(56,534	)	$	(137,435	)	$	480,350
Equity securities	398,752			(320,277		)	500,673
Short-term investments	(107		)	128			12
Net increase (decrease)	$	342,111		$	(457,584	)	$	981,035

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g)The following table presents other-than-temporary impairment losses recognized in net income and included in net realized investment gains by investment type.

	Years Ended December 31,
(dollars in thousands)	2016			2015			2014
Fixed maturity securities:
Commercial mortgage-backed	$	—		$	—		$	(61	)
Asset-backed	—			—			(197		)
Corporate	—			—			(46		)
Total fixed maturity securities	—			—			(304		)
Equity securities:
Insurance, banks and other financial institutions	(7,586		)	(9,835		)	(341		)
Industrial, consumer and all other	(10,769		)	(34,646		)	(4,139		)
Total equity securities	(18,355		)	(44,481		)	(4,480		)
Total	$	(18,355	)	$	(44,481	)	$	(4,784	)

h)The following table presents the components of restricted assets.

	December 31,
(dollars in thousands)	2016		2015
Restricted assets held in trust or on deposit to support underwriting activities	$	4,059,336	$	4,037,458
Investments and cash and cash equivalents pledged as security for letters of credit	355,616		745,744
Total	$	4,414,952	$	4,783,202

Total restricted assets are included on the Company's consolidated balance sheets as follows.

	December 31,
(dollars in thousands)	2016		2015
Investments, available-for-sale	$	4,068,535	$	4,343,070
Restricted cash and cash equivalents	346,417		440,132
Total	$	4,414,952	$	4,783,202

i)At December 31, 2016 and 2015, investments in securities issued by the U.S. Treasury, U.S. government agencies and U.S. government-sponsored enterprises were the only investments in any one issuer that exceeded 10% of shareholders' equity.

At December 31, 2016, the Company's ten largest equity holdings represented $2.1 billion, or 44%, of the equity portfolio. Investments in the property and casualty insurance industry represented $1.0 billion, or 22%, of the equity portfolio at December 31, 2016. Investments in the property and casualty insurance industry included a $511.3 million investment in the common stock of Berkshire Hathaway Inc.

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4. Receivables

The following table presents the components of receivables.

	December 31,
(dollars in thousands)	2016			2015
Amounts receivable from agents, brokers and insureds	$	1,061,190		$	983,510
Trade accounts receivable	123,341			119,558
Investment management and performance fees receivable	38,735			—
Employee stock loans receivable (see note 12(c))	20,171			16,900
Other	10,122			6,165
	1,253,559			1,126,133
Allowance for doubtful receivables	(11,910		)	(12,430		)
Receivables	$	1,241,649		$	1,113,703

5. Deferred Policy Acquisition Costs

The following table presents the amounts of policy acquisition costs deferred and amortized.

	Years Ended December 31,
(dollars in thousands)	2016			2015			2014
Balance, beginning of year	$	352,756		$	353,410		$	260,967
Policy acquisition costs deferred	823,840			752,324			754,303
Amortization of policy acquisition costs	(782,221		)	(744,964		)	(654,916		)
Foreign currency movements	(1,965		)	(8,014		)	(6,944		)
Deferred policy acquisition costs	$	392,410		$	352,756		$	353,410

The following table presents the components of underwriting, acquisition and insurance expenses.

	Years Ended December 31,
(dollars in thousands)	2016		2015		2014
Amortization of policy acquisition costs	$	782,221	$	744,964	$	654,916
Other operating expenses	716,369		710,116		805,966
Underwriting, acquisition and insurance expenses	$	1,498,590	$	1,455,080	$	1,460,882

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6. Property and Equipment

The following table presents the components of property and equipment, which are included in other assets on the consolidated balance sheets.

	December 31,
(dollars in thousands)	2016			2015
Land	$	56,783		$	56,408
Buildings	76,159			77,488
Leasehold improvements	95,898			104,003
Land improvements	74,040			71,585
Furniture and equipment	301,146			291,736
Other	162,385			134,939
	766,411			736,159
Accumulated depreciation and amortization	(354,009		)	(305,324		)
Property and equipment	$	412,402		$	430,835

Depreciation and amortization expense of property and equipment was $64.8 million, $64.2 million and $51.2 million for the years ended December 31, 2016, 2015 and 2014, respectively.

The Company does not own any individually material properties. The Company leases substantially all of the facilities used by its insurance operations and certain furniture and equipment under operating leases. The Company leases offices for the U.S. Insurance segment in Glen Allen, Virginia and in 24 other locations; the Company leases offices for the International Insurance segment in London, England and in 29 other locations; and the Company leases offices for the Reinsurance segment primarily in Summit, New Jersey and Hamilton, Bermuda. The Company's Markel Ventures operations own certain of their office, clinic, manufacturing, warehouse and distribution facilities and lease others. The Company believes these facilities are suitable and adequate for the Company's insurance and non-insurance operations.

7. Goodwill and Intangible Assets

The following table presents the components of goodwill by reportable segment.

(dollars in thousands)	U.S. Insurance		International Insurance			Reinsurance		Other(1)			Total
January 1, 2015	$	280,579	$	408,183		$	122,745	$	237,608		$	1,049,115
Acquisitions (see note 2)	—		—			—		146,659			146,659
Impairment loss	—		—			—		(14,880		)	(14,880		)
Foreign currency movements and other adjustments	—		(10,190		)	—		(2,860		)	(13,050		)
December 31, 2015 (2)	$	280,579	$	397,993		$	122,745	$	366,527		$	1,167,844
Impairment loss	—		—			—		(18,723		)	(18,723		)
Foreign currency movements and other adjustments	—		(5,809		)	—		(1,064		)	(6,873		)
December 31, 2016 (2)	$	280,579	$	392,184		$	122,745	$	346,740		$	1,142,248

⁽¹⁾  Amounts included in Other above are related to the Company's non-insurance operations, which are not included in a reportable segment.

⁽²⁾  Goodwill is net of accumulated impairment losses of $47.3 million and $28.6 million, as of December 31, 2016 and 2015, respectively, included in Other.

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Goodwill and indefinite-lived intangible assets are tested for impairment at least annually. The Company completes an annual test during the fourth quarter of each year based upon the results of operations through September 30. As part of our annual impairment test, during the fourth quarter of 2016, the Company recorded a goodwill impairment charge of $18.7 million to other expenses for one of our Markel Ventures industrial manufacturing reporting units, to reduce the carrying value of its goodwill to its implied fair value. Unfavorable market conditions, specifically declining oil prices from late 2014 through 2016 resulted in lower than expected earnings over a similar time period. The reporting unit's earnings are generally tied to infrastructure spending across global markets, a significant portion of which are influenced by the price of oil. To determine the value of the impairment loss, the Company estimated the fair value of the reporting unit primarily using an income approach based on a discounted cash flow model. While these cash flow projections yield positive cash flows and earnings in the long-term, they were insufficient to support the current carrying value of the reporting unit due to the unfavorable impact of current market conditions and recent trends on our shorter-term projections. Following the impairment charge in 2016, the carrying value of the reporting unit's goodwill is zero.

During the fourth quarters of 2015 and 2014, the Company recorded goodwill impairment charges of $14.9 million and $13.7 million, respectively, to other expenses, for one of our Markel Ventures healthcare reporting units, to reduce the carrying value of its goodwill to its implied fair value. The reporting unit's operations consist of the planning, development and operation of behavioral health services in partnership with healthcare organizations and are reported in our non-insurance operations. In both periods, the Company determined the goodwill for the reporting unit was impaired as a result of lower than expected earnings and lower estimated future earnings. To determine the value of the impairment losses, the Company estimated the fair value of the reporting unit primarily using an income approach based on a discounted cash flow model. Following the impairment charge in 2015, the carrying value of the reporting unit's goodwill is zero.

The following table presents the components of intangible assets with a net carrying amount.

	December 31,
	2016					2015
(dollars in thousands)	Gross Carrying Amount		Accumulated Amortization			Gross Carrying Amount		Accumulated Amortization
Customer relationships	$	460,327	$	(119,376	)	$	481,547	$	(97,892	)
Broker relationships	183,092		(56,888		)	182,626		(45,135		)
Trade names	100,966		(29,745		)	103,681		(23,821		)
Investment management agreements	98,000		(7,000		)	98,000		—
Technology	54,408		(28,220		)	54,241		(22,288		)
Insurance licenses	30,185		—			30,185		—
Lloyd's syndicate capacity	12,000		—			12,000		—
Other	34,172		(9,379		)	30,496		(11,268		)
Total	$	973,150	$	(250,608	)	$	992,776	$	(200,404	)

Amortization of intangible assets was $68.5 million, $68.9 million and $57.6 million for the years ended December 31, 2016, 2015 and 2014, respectively. Amortization of intangible assets is estimated to be $67.4 million for 2017, $66.0 million for 2018, $58.0 million for 2019, $51.6 million for 2020 and $50.0 million for 2021. Indefinite-lived intangible assets were $48.2 million at December 31, 2016 and December 31, 2015.

8. Income Taxes

Income before income taxes includes the following components.

	Years Ended December 31,
(dollars in thousands)	2016		2015		2014
Domestic operations	$	288,905	$	323,954	$	240,279
Foreign operations	341,015		418,151		200,099
Income before income taxes	$	629,920	$	742,105	$	440,378

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Income tax expense includes the following components.

	Years Ended December 31,
(dollars in thousands)	2016		2015			2014
Current:
Domestic	$	57,916	$	44,406		$	7,573
Foreign	48,203		118,235			24,574
Total current tax expense	106,119		162,641			32,147
Deferred:
Domestic	19,991		9,415			43,673
Foreign	43,367		(19,093		)	40,870
Total deferred tax expense (benefit)	63,358		(9,678		)	84,543
Income tax expense	$	169,477	$	152,963		$	116,690

Foreign income tax expense includes United States income tax expense on foreign operations, which includes United States income tax on the Company's Bermuda-based operations, certain of which have elected to be taxed as domestic corporations for United States tax purposes.

State income tax expense is not material to the consolidated financial statements.

The Company made income tax payments of $142.2 million, $132.5 million and $89.5 million in 2016, 2015 and 2014, respectively. Current income taxes payable were $46.4 million and $63.5 million at December 31, 2016 and 2015, respectively, and were included in other liabilities on the consolidated balance sheets.

Reconciliations of the United States corporate income tax rate to the effective tax rate on income before income taxes are presented in the following table.

	Years Ended December 31,
	2016		2015		2014
United States corporate tax rate	35	%	35	%	35	%
Tax-exempt investment income	(6	)	(5	)	(9	)
Foreign tax credits	(2	)	(8	)	(1	)
Foreign operations	1		(1	)	—
Other	(1	)	—		1
Effective tax rate	27	%	21	%	26	%

The 2015 effective tax rate included an 8% income tax benefit related to tax credits for foreign taxes paid. In previous periods, certain foreign taxes paid were not available for use as tax credits against the Company's United States provision for income taxes. Based on the Company's earnings from foreign operations in 2015, significant foreign taxes paid, both in 2015 and prior periods, were used as credits against its United States provision for income taxes in 2015. Foreign tax credits of the magnitude recognized in 2015 are not expected in future periods.

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The following table presents the components of domestic and foreign deferred tax assets and liabilities.

	December 31,
(dollars in thousands)	2016			2015
Assets:
Unpaid losses and loss adjustment expenses	$	181,303		$	212,012
Life and annuity benefits	135,075			156,950
Unearned premiums recognized for income tax purposes	121,852			102,076
Accrued incentive compensation	67,719			53,586
Investments, including other-than-temporary impairments	58,248			65,641
Net operating loss carryforwards	26,743			18,771
Tax credit carryforwards	23,037			18,158
Stock-based compensation	19,235			21,948
Other differences between financial reporting and tax bases	44,942			40,497
Total gross deferred tax assets	678,154			689,639
Less valuation allowance	(18,781		)	(5,131		)
Total gross deferred tax assets, net of allowance	659,373			684,508
Liabilities:
Net unrealized gains on investments	723,198			626,776
Deferred policy acquisition costs	128,302			88,036
Amortization of goodwill and other intangible assets	102,631			107,271
Other differences between financial reporting and tax bases	35,727			38,613
Total gross deferred tax liabilities	989,858			860,696
Net deferred tax liability	$	330,485		$	176,188

The net deferred tax liability at December 31, 2016 and 2015 was included in other liabilities on the consolidated balance sheets.

At December 31, 2016, the Company had tax credit carryforwards of $23.0 million. The earliest any of these credits will expire is 2025.

At December 31, 2016, the Company had net operating losses of $12.6 million that can be used to offset future taxable income in the United States from Markel Capital Limited, a wholly owned United Kingdom subsidiary. The Company's ability to use these losses in the United States expires between the years 2023 and 2033. At December 31, 2016, the Company also had net operating losses of $18.1 million that can be used to offset other future taxable income in the United States. The Company's ability to use these losses in the United States expires between the years 2028 and 2030. At December 31, 2016, certain branch operations in Europe and a wholly owned subsidiary in Brazil had net operating losses of $81.7 million that can be used to offset future income in their local jurisdictions. The Company's ability to use $20.4 million of these losses expires between the years 2020 and 2025. The remaining losses are not subject to expiration. As discussed below, the deferred tax assets related to losses at the Company's European branches and Brazilian subsidiary are offset by valuation allowances.

The Company believes that it is more likely than not that it will realize $659.4 million of gross deferred tax assets, including net operating losses at December 31, 2016, through generating taxable income or the reversal of existing temporary differences attributable to the gross deferred tax liabilities. As a result of cumulative net operating losses in certain jurisdictions, the Company has a valuation allowance of $18.8 million at December 31, 2016 that offsets the deferred tax assets primarily related to losses incurred at European branches of one of the Company's wholly owned United Kingdom subsidiaries and at one of the Company's Brazilian subsidiaries.

At December 31, 2016, the Company had unrecognized tax benefits of $8.9 million. If recognized, $8.6 million of these tax benefits would decrease the annual effective tax rate. The Company does not currently anticipate any changes in unrecognized tax benefits during 2017 that would have a material impact on the Company's income tax provision.

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The following table presents a reconciliation of unrecognized tax benefits.

	Years Ended December 31,
(dollars in thousands)	2016			2015
Unrecognized tax benefits, beginning of year	$	15,324		$	17,700
Decreases for tax positions taken in prior years	—			(146		)
Lapse of statute of limitations	(6,448		)	(606		)
Settlement with taxing authorities	—			(1,624		)
Unrecognized tax benefits, end of year	$	8,876		$	15,324

With the exception of certain of our Bermuda subsidiaries, at December 31, 2016, earnings of the Company's foreign subsidiaries not previously taxed in the United States are considered reinvested indefinitely and no provision for deferred United States income taxes has been recorded. If the Company's intentions with respect to reinvestment were to change, and earnings were to be repatriated to the United States, these foreign subsidiaries would be subject to tax in the United States less applicable foreign tax credits. As of December 31, 2016, cumulative earnings of our foreign subsidiaries that are considered reinvested indefinitely and have not previously been subject to tax in the United States totaled approximately $615 million.

The Company is subject to income tax in the United States and in foreign jurisdictions. With few exceptions, the Company is no longer subject to income tax examination by tax authorities for years ended before January 1, 2013. During the first quarter of 2016, the Internal Revenue Service completed its examination of the Company's 2012 United States federal income tax return. There were no adjustments to the Company's income tax liabilities as a result of this examination.

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9. Unpaid Losses and Loss Adjustment Expenses

a)The following table presents a reconciliation of consolidated beginning and ending reserves for losses and loss adjustment expenses. In 2016, incurred losses and loss adjustment expenses in the following table exclude $11.7 million of favorable development on prior years loss reserves included in losses and loss adjustment expenses on the consolidated statement of income and other comprehensive income (loss) related to the commutation of a property and casualty deposit contract, for which the underlying deposit liability was included in other liabilities on the consolidated balance sheet as of December 31, 2015, rather than unpaid losses and loss adjustment expenses.

	Years Ended December 31,
(dollars in thousands)	2016			2015			2014
Net reserves for losses and loss adjustment expenses, beginning of year	$	8,235,288		$	8,535,483		$	8,407,642
Foreign currency movements	(129,692		)	(134,173		)	(137,385		)
Adjusted net reserves for losses and loss adjustment expenses, beginning of year	8,105,596			8,401,310			8,270,257
Incurred losses and loss adjustment expenses:
Current year	2,555,902			2,566,545			2,638,012
Prior years	(493,495		)	(627,800		)	(435,545		)
Total incurred losses and loss adjustment expenses	2,062,407			1,938,745			2,202,467
Payments:
Current year	532,140			486,551			502,107
Prior years	1,529,206			1,423,286			1,436,851
Total payments	2,061,346			1,909,837			1,938,958
Effect of foreign currency rate changes	2,060			(17,281		)	(19,476		)
Net reserves for losses and loss adjustment expenses of acquired insurance companies	—			—			21,193
Reinsurance recoverable on retroactive reinsurance transactions	—			(177,649		)	—
Net reserves for losses and loss adjustment expenses, end of year	8,108,717			8,235,288			8,535,483
Reinsurance recoverable on unpaid losses	2,006,945			2,016,665			1,868,669
Gross reserves for losses and loss adjustment expenses, end of year	$	10,115,662		$	10,251,953		$	10,404,152

On March 9, 2015, the Company completed a retroactive reinsurance transaction to cede a portfolio of policies primarily comprised of liabilities arising from asbestos and environmental (A&E) exposures that originated before 1992 in exchange for payments totaling $89.0 million, which included cash paid at closing of $69.9 million. At the time of the transaction, reserves for unpaid losses and loss adjustment expenses on the policies ceded totaled $94.1 million, resulting in a deferred gain of $5.1 million which will be recognized in earnings in proportion to actual reinsurance recoveries received pursuant to the transaction.

On October 30, 2015, the Company completed a second retroactive reinsurance transaction to cede a portfolio of policies primarily comprised of liabilities arising from A&E exposures that originated before 1987 in exchange for cash payments totaling $86.5 million. The transaction provides up to $300 million of coverage for losses in excess of a $97.0 million retention on the ceded policies and 50% coverage on an additional $100 million of losses. The transaction is effective as of January 1, 2015, at which time reserves for unpaid losses and loss adjustment expenses on the policies ceded totaled $173.4 million. After considering the Company's retention on the ceded policies, ceded reserves for unpaid losses and loss adjustment expenses totaled $76.4 million, resulting in an underwriting loss of $10.1 million on the transaction.

In 2016, incurred losses and loss adjustment expenses included $493.5 million of favorable development on prior years' loss reserves, which was due in part to $418.0 million of loss reserve redundancies on our long-tail casualty lines within the U.S. Insurance and International Insurance segments, our marine and energy product lines within the International Insurance segment, and our property product lines in the U.S. Insurance and Reinsurance segments, as actual claims reporting and development patterns on prior accident years have been more favorable than the Company's actuarial analyses initially anticipated. Redundancies in 2016 were partially offset by $71.2 million of adverse development on our specified medical and medical malpractice product lines within the U.S. Insurance segment.

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In 2015, incurred losses and loss adjustment expenses included $627.8 million of favorable development on prior years' loss reserves, which was due in part to $375.8 million of loss reserve redundancies on our general liability, workers' compensation, inland marine and brokerage property product lines within the U.S. Insurance segment and on our general liability, professional liability and marine and energy product lines within the International Insurance segment, as actual claims reporting patterns on prior accident years have been more favorable than the Company's actuarial analyses initially anticipated.

In 2015, incurred losses and loss adjustment expenses also included $82.7 million of favorable development on prior years' loss reserves attributable to a decrease in the estimated volatility of our consolidated net reserves for unpaid losses and loss adjustment expenses as a result of ceding a significant portion of the Company's A&E exposures to a third party during 2015, as described above. As a result of this decrease in estimated volatility, the level of confidence in the Company's net reserves for unpaid losses and loss adjustment expenses increased. Therefore, management reduced prior years' loss reserves by $82.7 million in order to maintain a consolidated confidence level in a range consistent with the Company's historic levels. This reduction in prior years' loss reserves occurred across all three of the Company's ongoing underwriting segments.

The favorable development on prior years' loss reserves in 2015 was partially offset by $25.4 million of adverse development on prior years' loss reserves for A&E exposures, of which $7.1 million is attributable to the underwriting loss on the retroactive reinsurance transaction described above. Following the October 2015 retroactive reinsurance transaction, the Company's actuaries increased their estimate of the ultimate losses on the remaining A&E claims and management increased prior years' loss reserves by $15.0 million. Without the diversification of a larger portfolio of loss reserves, there is greater uncertainty around the potential outcomes of the remaining claims, and management strengthened reserves accordingly.

In 2014, the Company recorded net reserves for losses and loss adjustment expenses of $21.2 million as a result of the acquisition of Abbey. These reserves were recorded at fair value as part of the Company's purchase accounting.

In 2014, incurred losses and loss adjustment expenses included $435.5 million of favorable development on prior years' loss reserves, which was due in part to $250.4 million of loss reserve redundancies on our long-tail casualty and professional liability lines within the U.S. Insurance segment and on our professional liability and marine and energy product lines within the International Insurance segment, as actual claims reporting patterns on prior accident years have been more favorable than the Company's actuarial analyses initially anticipated. The favorable development on prior years' loss reserves in 2014 was partially offset by $32.8 million of adverse development in prior years' loss reserves on A&E exposures.

Once a year, generally during the third quarter, the Company completes an in-depth, actuarial review of its A&E exposures. During the annual review for 2014, the Company increased its expectation of the severity of the outcome of certain claims subject to litigation. As the ultimate outcome of known claims increases, the Company's expected ultimate closure value on unreported claims also increases. As a result, prior years' loss reserves for A&E exposures were increased by $27.2 million in 2014. During the annual review for both 2016 and 2015, the Company determined that no adjustment to loss reserves was required.

The Company uses a variety of techniques to establish the liabilities for unpaid losses and loss adjustment expenses based upon estimates of the ultimate amounts payable. The Company maintains reserves for specific claims incurred and reported (case reserves) and reserves for claims incurred but not reported (IBNR reserves), which include expected development on reported claims. The Company does not discount its reserves for losses and loss adjustment expenses to reflect estimated present value, except for reserves assumed in connection with an acquisition, which are recorded at fair value at the acquisition date. The fair value adjustment includes an adjustment to reflect the acquired reserves for losses and loss adjustment expenses at present value plus a risk premium, the net of which is amortized to losses and loss adjustment expenses within the consolidated statements of income. The amount of unamortized fair value adjustments included in unpaid losses and loss adjustment expenses as of December 31, 2016 and 2015 was $68.9 million and $91.0 million, respectively.

As of any balance sheet date, all claims have not yet been reported, and some claims may not be reported for many years. As a result, the liability for unpaid losses and loss adjustment expenses includes significant estimates for incurred but not reported claims.

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There is normally a time lag between when a loss event occurs and when it is actually reported to the Company. The actuarial methods that the Company uses to estimate losses have been designed to address the lag in loss reporting as well as the delay in obtaining information that would allow the Company to more accurately estimate future payments. There is also a time lag between cedents establishing case reserves and re-estimating their reserves, and notifying the Company of the new or revised case reserves. As a result, the reporting lag is more pronounced in reinsurance contracts than in the insurance contracts due to the reliance on ceding companies to report their claims. On reinsurance transactions, the reporting lag will generally be 60 to 90 days after the end of a reporting period, but can be longer in some cases. Based on the experience of the Company's actuaries and management, loss development factors and trending techniques are selected to mitigate the difficulties caused by reporting lags. The loss development and trending factor selections are evaluated at least annually and updated using cedent specific and industry data.

IBNR reserves are based on the estimated ultimate cost of settling claims, including the effects of inflation and other social and economic factors, using past experience adjusted for current trends and any other factors that would modify past experience. IBNR reserves, which include expected development on reported claims, are generally calculated by subtracting paid losses and loss adjustment expenses and case reserves from estimated ultimate losses and loss adjustment expenses. IBNR reserves were 67% of total unpaid losses and loss adjustment expenses at December 31, 2016 compared to 65% at December 31, 2015

In establishing liabilities for unpaid losses and loss adjustment expenses, the Company's actuaries estimate an ultimate loss ratio, by accident year or policy year, for each product line with input from underwriting and claims associates. For product lines in which loss reserves are established on a policy year basis, the Company has developed a methodology to convert from policy year to accident year for financial reporting purposes. In estimating an ultimate loss ratio for a particular line of business, the actuaries may use one or more actuarial reserving methods and select from these a single point estimate. To varying degrees, these methods include detailed statistical analysis of past claim reporting, settlement activity, claim frequency and severity, policyholder loss experience, industry loss experience and changes in market conditions, policy forms and exposures. Greater judgment may be required when new product lines are introduced or when there have been changes in claims handling practices, as the statistical data available may be insufficient. These estimates also reflect implicit and explicit assumptions regarding the potential effects of external factors, including economic and social inflation, judicial decisions, changes in law, general economic conditions and recent trends in these factors. Management believes the process of evaluating past experience, adjusted for the effects of current developments and anticipated trends, is an appropriate basis for predicting future events.

Loss reserves are established at management's best estimate, which is generally higher than the corresponding actuarially calculated point estimate. The actuarial point estimate represents the actuaries' estimate of the most likely amount that will ultimately be paid to settle the loss reserves that are recorded at a particular point in time; however, there is inherent uncertainty in the point estimate as it is the expected value in a range of possible reserve estimates. In some cases, actuarial analyses, which are based on statistical analysis, cannot fully incorporate all of the subjective factors that affect development of losses. In other cases, management's perspective of these more subjective factors may differ from the actuarial perspective. Subjective factors where management's perspective may differ from that of the actuaries include: the credibility and timeliness of claims information received from third parties, economic and social inflation, judicial decisions, changes in law, changes in underwriting or claims handling practices, general economic conditions, the risk of moral hazard and other current and developing trends within the insurance and reinsurance markets, including the effects of competition. As a result, the actuarially calculated point estimates for each of line of business represents starting points for management's quarterly review of loss reserves.

Inherent in the Company's reserving practices is the desire to establish loss reserves that are more likely redundant than deficient. As such, the Company seeks to establish loss reserves that will ultimately prove to be adequate. As part of the Company's acquisition of insurance operations, to the extent the reserving philosophy of the acquired business differs from the Company's reserving philosophy, the post-acquisition loss reserves will be strengthened until total loss reserves are consistent with the Company's target level of confidence. Furthermore, the Company's philosophy is to price its insurance products to make an underwriting profit. Management continually attempts to improve its loss estimation process by refining its ability to analyze loss development patterns, claim payments and other information, but uncertainty remains regarding the potential for adverse development of estimated ultimate liabilities.

Following the completion of two retroactive reinsurance transactions in 2015, the Company has less variability in its consolidated loss reserves. Additionally, management continues to gain confidence in the actuarial projections on product lines previously written by Alterra Capital Holdings Limited (Alterra), which we acquired in 2013.  As a result, management's best estimate of the current accident year ultimate loss ratios on various product lines across all three of the Company's ongoing underwriting segments decreased in 2016 compared to 2015.

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Management currently believes the Company's gross and net reserves are adequate. However, there is no precise method for evaluating the impact of any significant factor on the adequacy of reserves, and actual results will differ from original estimates.

b)The following tables present loss development information, by accident year, for the Company's U.S. Insurance, International Insurance and Reinsurance segments, including cumulative incurred and paid losses and allocated loss adjustment expenses, net of reinsurance, as well as the corresponding amount of IBNR reserves as of December 31, 2016. This level of disaggregation is consistent with how the Company analyzes loss reserves for both internal and external reporting purposes. The loss development information for the years ended December 31, 2012 through 2015 is presented as supplementary information. For the Company's U.S. Insurance segment, the years presented in the tables comprise the majority of the period for which incurred losses typically remain outstanding. Incurred losses in the Company's International Insurance and Reinsurance segments, which generally include a larger proportion of long-tail business than the U.S. Insurance segment, generally remain outstanding more than five years; however, data prior to 2012 is not practically available by segment as a result of a change in the Company's reportable segments in 2014, which was most impactful on these two segments. Additionally, reserves for our international operations within these two segments are determined on a policy year basis and historical data prior to 2012 does not exist by accident year. All amounts included in the tables below related to transactions denominated in a foreign currency have been translated into United States Dollars using the exchange rates in effect at December 31, 2016.

The tables below also include claim frequency information, by accident year, for each of the segments presented. The Company defines a claim as a single claim incident, per policy, which may include multiple claimants and multiple coverages on a single policy. Claim counts include claims closed without a payment as well as claims where the Company is monitoring to determine if an exposure exists, even if a reserve has not been established.

In 2013, the Company completed the acquisition of Alterra, the results of which are included in each of the Company's reportable segments. Ultimate incurred losses and loss adjustment expenses, net of reinsurance for the year ended December 31, 2013 include outstanding liabilities for losses and loss adjustment expenses of Alterra as of the acquisition date, by accident year and not in any prior periods. Pre-acquisition data is not available by segment and accident year as a result of changes to the historical Alterra product line reporting structure that impacted each of the Company's reportable segments and the impact of significant intercompany reinsurance contracts. Additionally, Alterra reserves were historically determined on a policy year basis and pre-acquisition data does not exist in a format that can be used to determine accident year and segment. Following the acquisition, ongoing business attributable to Alterra was integrated with the Company's other insurance operations and is not separately tracked.

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U.S. Insurance Segment

	Ultimate Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance										Total of Incurred-but-Not-Reported Liabilities, Net of Reinsurance		Cumulative Number of Reported Claims
	Unaudited								Year Ended December 31,
(in thousands)	Years Ended December 31,
Accident Year	2012		2013		2014		2015		2016		December 31, 2016
2012	$	949,141	$	985,721	$	924,138	$	924,621	$	909,237	$	117,333	106
2013			1,130,681		1,105,927		1,042,100		1,009,438		175,309		65
2014					1,278,116		1,140,685		1,116,093		290,827		56
2015							1,285,411		1,211,389		500,705		55
2016									1,319,731		781,984		49
Total									$	5,565,888
	Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance
	Unaudited								Year Ended December 31,
	Years Ended December 31,
Accident Year	2012		2013		2014		2015		2016
2012	$	193,708	$	401,773	$	546,635	$	644,658	$	728,802
2013			222,890		443,392		594,558		725,782
2014					264,697		487,068		650,118
2015							260,121		514,497
2016									278,650
Total									$	2,897,849
All outstanding liabilities for unpaid losses and loss adjustment expenses before 2012, net of reinsurance									402,534
Total liabilities for unpaid losses and loss adjustment expenses, net of reinsurance									$	3,070,573

Ultimate incurred losses and allocated loss adjustment expenses for the year ended December 31, 2013 for the U.S. Insurance segment include $97.4 million and $149.9 million of losses and loss adjustment expenses on the 2012 and 2013 accident years, respectively, attributable to Alterra. Cumulative paid losses and allocated loss adjustment expenses for the year ended December 31, 2013 include $22.6 million and $23.2 million of paid losses and allocated loss adjustment expenses on the 2012 and 2013 accident years, respectively, attributable to the acquired Alterra reserves and post-acquisition Alterra business. Cumulative paid losses and allocated loss adjustment expenses and cumulative reported claims for the 2012 and 2013 accident years exclude any claims paid or closed prior to the acquisition.

Cumulative reported claims for the 2012 and 2013 accident years include 65 thousand and 16 thousand, respectively, of claim counts associated with a personal lines product with high claim frequency and low claim severity that the Company stopped writing in 2013. The related net incurred losses and allocated loss adjustment expenses are not material to the U.S. Insurance segment.

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International Insurance Segment

	Ultimate Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance										Total of Incurred-but-Not-Reported Liabilities, Net of Reinsurance		Cumulative Number of Reported Claims
	Unaudited								Year Ended December 31,
(in thousands)	Years Ended December 31,
Accident Year	2012		2013		2014		2015		2016		December 31, 2016
2012	$	412,684	$	616,641	$	557,604	$	495,641	$	479,558	$	87,383	18
2013			597,145		581,164		476,433		446,568		155,062		17
2014					577,454		545,954		502,708		149,455		16
2015							488,649		489,119		222,864		16
2016									543,959		279,320		13
Total									$	2,461,912
	Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance
	Unaudited								Year Ended December 31,
	Years Ended December 31,
Accident Year	2012		2013		2014		2015		2016
2012	$	38,992	$	163,805	$	230,882	$	289,517	$	319,843
2013			47,887		126,699		182,173		220,625
2014					65,683		167,568		240,050
2015							61,556		148,037
2016									92,665
Total									$	1,021,220
All outstanding liabilities for unpaid losses and loss adjustment expenses before 2012, net of reinsurance									570,940
Total liabilities for unpaid losses and loss adjustment expenses, net of reinsurance									$	2,011,632

Ultimate incurred losses and allocated loss adjustment expenses for the year ended December 31, 2013 for the International Insurance segment include $158.0 million and $162.7 million of losses and loss adjustment expenses on the 2012 and 2013 accident years, respectively, attributable to Alterra. Cumulative paid losses and allocated loss adjustment expenses for the year ended December 31, 2013 include $14.0 million and $6.2 million of paid losses and allocated loss adjustment expenses on the 2012 and 2013 accident years, respectively, attributable to the acquired Alterra reserves and post-acquisition Alterra business. Cumulative paid losses and allocated loss adjustment expenses and cumulative reported claims for the 2012 and 2013 accident years exclude any claims paid or closed prior to the acquisition.

Business contained within the Company's International Insurance segment includes business managed by other managing agents, coverholders and third party administrators, for which the Company is unable to obtain access to the underlying claim counts. As such, the claim count information for this business has been excluded from the total claim counts reported above. This business represents 4% of the cumulative incurred losses and allocated loss adjustment expenses, net of reinsurance, on the 2012 through 2016 accident years detailed above.

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Reinsurance Segment

	Ultimate Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance										Total of Incurred-but-Not-Reported Liabilities, Net of Reinsurance
	Unaudited								Year Ended December 31,
(in thousands)	Years Ended December 31,
Accident Year	2012		2013		2014		2015		2016		December 31, 2016
2012	$	72,250	$	545,939	$	503,410	$	482,836	$	455,103	$	137,778
2013			581,963		574,760		545,743		531,955		179,519
2014					575,479		565,252		536,274		209,246
2015							526,286		511,959		306,717
2016									529,518		382,407
Total									$	2,564,809
	Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance
	Unaudited								Year Ended December 31,
	Years Ended December 31,
Accident Year	2012		2013		2014		2015		2016
2012	$	3,955	$	64,209	$	128,174	$	183,321	$	230,742
2013			71,182		154,494		209,256		268,052
2014					97,617		158,104		228,293
2015							63,963		134,530
2016									79,481
Total									$	941,098
All outstanding liabilities for unpaid losses and loss adjustment expenses before 2012, net of reinsurance									840,563
Total liabilities for unpaid losses and loss adjustment expenses, net of reinsurance									$	2,464,274

Ultimate incurred losses and allocated loss adjustment expenses for the year ended December 31, 2013 for the Reinsurance segment include $471.0 million and $531.8 million of losses and loss adjustment expenses on the 2012 and 2013 accident years, respectively, attributable to Alterra. Cumulative paid losses and allocated loss adjustment expenses for the year ended December 31, 2013 include $52.4 million and $68.6 million of paid losses and allocated loss adjustment expenses on the 2012 and 2013 accident years, respectively, attributable to the acquired Alterra reserves and post-acquisition Alterra business. Cumulative paid losses and allocated loss adjustment expenses for the 2012 and 2013 accident years exclude any claims paid prior to the acquisition.

All of the business contained within the Company's Reinsurance segment represents treaty business that is assumed from other insurance or reinsurance companies, for which the Company does not have access to the underlying claim counts. Further, this business includes both quota share and excess of loss treaty reinsurance, through which only a portion of each reported claim results in losses to the Company. As such, the Company has excluded claim count information from the Reinsurance segment disclosures.

The following table presents supplementary information about average historical claims duration as of December 31, 2016 based on the cumulative incurred and paid losses and allocated loss adjustment expenses presented above.

	Average Annual Percentage Payout of Incurred Losses by Age (in Years), Net of Reinsurance
Unaudited	1		2		3		4		5
U.S. Insurance	21.9	%	21.4	%	15.2	%	11.9	%	9.3	%
International Insurance	12.3	%	20.4	%	13.6	%	10.4	%	6.3	%
Reinsurance	12.0	%	13.5	%	12.5	%	11.6	%	10.4	%

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The following table reconciles the net incurred and paid loss development tables, by segment, to the liability for losses and loss adjustment expenses in the consolidated balance sheet.

(dollars in thousands)	December 31, 2016
Net outstanding liabilities
U.S. Insurance	$	3,070,573
International Insurance	2,011,632
Reinsurance	2,464,274
Other Insurance (Discontinued Lines)	281,562
Liabilities for unpaid losses and loss adjustment expenses, net of reinsurance	7,828,041
Reinsurance recoverable on unpaid losses
U.S. Insurance	631,608
International Insurance	982,127
Reinsurance	140,629
Other Insurance (Discontinued Lines)	252,581
Total reinsurance recoverable on unpaid losses	2,006,945
Unallocated loss adjustment expenses	211,777
Unamortized fair value adjustments on acquired reserves for losses and loss adjustment expenses	68,899
	280,676
Total gross liability for unpaid losses and loss adjustment expenses	$	10,115,662

c)The Company's exposure to A&E claims results from policies written by acquired insurance operations before their acquisition by the Company. The Company's exposure to A&E claims originated from umbrella, excess and commercial general liability (CGL) insurance policies and assumed reinsurance contracts that were written on an occurrence basis from the 1970s to mid-1980s. Exposure also originated from claims-made policies that were designed to cover environmental risks provided that all other terms and conditions of the policy were met.

A&E claims include property damage and clean-up costs related to pollution, as well as personal injury allegedly arising from exposure to hazardous materials. After 1986, the Company began underwriting CGL coverage with pollution exclusions, and in some lines of business the Company began using a claims-made form. These changes significantly reduced the Company's exposure to future A&E claims on post-1986 business.

The following table provides a reconciliation of beginning and ending A&E reserves for losses and loss adjustment expenses, which are a component of consolidated unpaid losses and loss adjustment expenses. Amounts included in the following table are presented before consideration of reinsurance allowances.

	Years Ended December 31,
(dollars in thousands)	2016			2015			2014
Net reserves for A&E losses and loss adjustment expenses, beginning of year	$	132,869		$	287,723		$	272,194
Incurred losses and loss adjustment expenses	(5,277		)	25,415			32,840
Payments	(15,988		)	(20,628		)	(17,311		)
Reinsurance recoverable on retroactive reinsurance transactions	—			(159,641		)	—
Net reserves for A&E losses and loss adjustment expenses, end of year	111,604			132,869			287,723
Reinsurance recoverable on unpaid losses	212,300			253,756			102,719
Gross reserves for A&E losses and loss adjustment expenses, end of year	$	323,904		$	386,625		$	390,442

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At December 31, 2016, asbestos-related reserves were $252.1 million and $90.0 million on a gross and net basis, respectively. Net reserves for reported claims for A&E exposures were $104.1 million at December 31, 2016. Net incurred but not reported reserves for A&E exposures were $7.5 million at December 31, 2016. Inception-to-date net paid losses and loss adjustment expenses for A&E related exposures totaled $612.0 million at December 31, 2016, which includes $159.6 million of payments for two retroactive reinsurance transactions completed in 2015 and $93.6 million of litigation-related expense. As previously described, during 2015, the Company completed two retroactive reinsurance transactions to cede two portfolios of policies primarily comprised of liabilities arising from A&E exposures. At the time of the transactions, the reinsurance recoverable for the retroactive reinsurance coverages totaled $177.6 million, of which $159.6 million was attributable to A&E exposures.

The Company's reserves for losses and loss adjustment expenses related to A&E exposures represent management's best estimate of ultimate settlement values. A&E reserves are monitored by management, and the Company's statistical analysis of these reserves is reviewed by the Company's independent actuaries. A&E exposures are subject to significant uncertainty due to potential loss severity and frequency resulting from the uncertain and unfavorable legal climate. A&E reserves could be subject to increases in the future; however, management believes the Company's gross and net A&E reserves at December 31, 2016 are adequate.

10. Life and Annuity Benefits

The following table presents life and annuity benefits.

	December 31,
(dollars in thousands)	2016		2015
Life	$	131,768	$	142,068
Annuities	849,226		901,218
Accident and health	68,660		79,989
Total	$	1,049,654	$	1,123,275

Life and annuity benefits are compiled on a reinsurance contract-by-contract basis and are discounted using standard actuarial techniques and cash flow models. Since the development of the life and annuity reinsurance reserves is based upon cash flow projection models, the Company must make estimates and assumptions based on cedent experience, industry mortality tables, and expense and investment experience, including a provision for adverse deviation. The assumptions used to determine policy benefit reserves are generally locked-in for the life of the contract unless an unlocking event occurs. Loss recognition testing is performed to determine if existing policy benefit reserves, together with the present value of future gross premiums and expected investment income earned thereon, are adequate to cover the present value of future benefits, settlement and maintenance costs. If the existing policy benefit reserves are not sufficient, the locked-in assumptions are revised to current best estimate assumptions and a charge to earnings for life and annuity benefits is recognized at that time.

Because of the assumptions and estimates used in establishing the Company's reserves for life and annuity benefit obligations and the long-term nature of these reinsurance contracts, the ultimate liability may be greater or less than the estimates. The average discount rate for the life and annuity benefit reserves was 2.3% as of December 31, 2016.

As of December 31, 2016, the largest life and annuity benefits reserve for a single contract was 32.9% of the total.

No annuities included in life and annuity benefits in the consolidated balance sheet are subject to discretionary withdrawal.

On April 24, 2015, the Company completed a novation that transferred its obligations under a reinsurance contract for life and annuity benefit policies to a third party in exchange for cash payments totaling $29.0 million, net of commissions. At the time of the transaction, reserves for life and annuity benefits on the novated reinsurance contract totaled $32.6 million, resulting in a gain of $3.6 million that was recorded as an offset to other expenses.

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11. Senior Long-Term Debt and Other Debt

The following table summarizes the Company's senior long-term debt and other debt.

	December 31,
(dollars in thousands)	2016		2015
7.20% unsecured senior notes, due April 14, 2017, interest payable semi-annually, net of unamortized premium of $417 in 2016 and $1,808 in 2015	$	91,046	$	92,436
7.125% unsecured senior notes, due September 30, 2019, interest payable semi-annually, net of unamortized discount of $522 in 2016 and $1,060 in 2015	234,183		346,725
6.25% unsecured senior notes, due September 30, 2020, interest payable semi-annually, net of unamortized premium of $35,717 in 2016 and $44,519 in 2015	385,714		394,464
5.35% unsecured senior notes, due June 1, 2021, interest payable semi-annually, net of unamortized discount of $912 in 2016 and $1,119 in 2015	248,957		248,694
4.90% unsecured senior notes, due July 1, 2022, interest payable semi-annually, net of unamortized discount of $1,536 in 2016 and $1,815 in 2015	348,215		347,891
3.625% unsecured senior notes, due March 30, 2023, interest payable semi-annually, net of unamortized discount of $1,257 in 2016 and $1,458 in 2015	248,508		248,277
7.35% unsecured senior notes, due August 15, 2034, interest payable semi-annually, net of unamortized discount of $1,212 in 2016 and $1,972 in 2015	128,570		197,923
5.0% unsecured senior notes, due March 30, 2043, interest payable semi-annually, net of unamortized discount of $5,879 in 2016 and $6,103 in 2015	243,796		243,559
5.0% unsecured senior notes, due April 5, 2046, interest payable semi-annually, net of unamortized discount of $7,154 in 2016	491,943		—
Other debt, at various interest rates ranging from 1.7% to 6.5%	153,597		119,302
Senior long-term debt and other debt	$	2,574,529	$	2,239,271

The Company's 6.25% unsecured senior notes and the 7.20% unsecured senior notes were issued by Alterra Finance LLC and Alterra USA Holdings Limited, respectively, which are wholly owned indirect subsidiaries of the Company, and are guaranteed by Markel Corporation. All of the Company's other unsecured senior notes were issued by Markel Corporation.

In the second quarter of 2016, the Company issued $500 million of 5.0% unsecured senior notes due April 5, 2046. Net proceeds to the Company were $493.1 million. The Company used a portion of these proceeds to purchase $70.2 million of principal on its 7.35% unsecured senior notes due 2034 and $108.8 million of principal on its 7.125% unsecured senior notes due 2019 through a tender offer at a total purchase price of $95.0 million and $126.4 million, respectively. The Company also expects to use the proceeds from this issuance to retire its 7.20% unsecured senior notes, when they come due April 14, 2017, and the remainder for general corporate purposes. In connection with the purchase, the Company recognized a loss on early extinguishment of debt of $44.1 million during the year ended December 31, 2016.

The Company's 7.35% unsecured senior notes due August 15, 2034 are not redeemable. The Company's other unsecured senior notes are redeemable by the Company at any time, subject to payment of a make-whole premium to the noteholders. None of the Company's senior long-term debt is subject to any sinking fund requirements.

The Company's other debt is primarily associated with its Markel Ventures operations and is non-recourse to the holding company. The debt of the Company's Markel Ventures subsidiaries generally is secured by the assets of those subsidiaries. ParkLand, a subsidiary of the Company, has formed subsidiaries for the purpose of acquiring and financing real estate (the real estate subsidiaries). The assets of certain real estate subsidiaries, which are not material to the Company, are consolidated in accordance with U.S. GAAP but are not available to satisfy the debt and other obligations of the Company or any affiliates other than those real estate subsidiaries. Other debt also includes a $62.5 million note payable delivered as part of the consideration provided for the investment held by the Markel Diversified Fund, as discussed in note 17.

The estimated fair value of the Company's senior long-term debt and other debt was $2.7 billion and $2.4 billion at December 31, 2016 and 2015, respectively.

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The following table summarizes the future principal payments due at maturity on senior long-term debt and other debt as of December 31, 2016.

Years Ending December 31,	(dollars in thousands)
2017	$	183,916
2018	6,365
2019	239,633
2020	359,332
2021	284,758
2022 and thereafter	1,485,404
Total principal payments	$	2,559,408
Net unamortized premium	17,662
Net unamortized debt issuance costs	(2,541		)
Senior long-term debt and other debt	$	2,574,529

The Company maintains a revolving credit facility which provides $300 million of capacity for future acquisitions, investments, repurchases of capital stock of the Company and for general corporate purposes. At the Company's discretion, $200 million of the total capacity may be used for secured letters of credit. The Company may increase the capacity of the facility to $500 million subject to certain terms and conditions. The Company pays interest on balances outstanding under the facility and a utilization fee for letters of credit issued under the facility. The Company also pays a commitment fee (0.225% at December 31, 2016) on the unused portion of the facility based on the Company's debt to equity leverage ratio as calculated under the credit agreement. Markel Corporation, along with Alterra Finance LLC and Alterra USA Holdings Limited, guaranteed the Company's obligations under the facility. As a result, the Company's revolving credit facility ranks equally with the 6.25% unsecured senior notes and the 7.20% unsecured senior notes. At December 31, 2016 and 2015, the Company had no borrowings outstanding under this revolving credit facility. This facility expires in August 2019.

At December 31, 2016, the Company was in compliance with all covenants contained in its revolving credit facility. To the extent that the Company is not in compliance with its covenants, the Company's access to the revolving credit facility could be restricted.

The Company paid $135.4 million, $127.0 million and $125.8 million in interest on its senior long-term debt and other debt during the years ended December 31, 2016, 2015 and 2014, respectively.

12. Shareholders' Equity

a)The Company had 50,000,000 shares of no par value common stock authorized of which 13,954,931 shares and 13,959,018 shares were issued and outstanding at December 31, 2016 and 2015, respectively. The Company also has 10,000,000 shares of no par value preferred stock authorized, none of which was issued or outstanding at December 31, 2016 or 2015.

The Company's Board of Directors has approved the repurchase of up to $300 million of common stock under a share repurchase program (the Program). Under the Program, the Company may repurchase outstanding shares of common stock from time to time, primarily through open-market transactions. The Program has no expiration date but may be terminated by the Board of Directors at any time. As of December 31, 2016, the Company had repurchased 96,345 shares of common stock at a cost of $70.7 million under the Program.

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b)Net income per share was determined by dividing adjusted net income to shareholders by the applicable weighted average shares outstanding. Basic shares outstanding include restricted stock units that are no longer subject to any contingencies for issuance, but for which the corresponding shares have not been issued. Diluted net income per share is computed by dividing adjusted net income to shareholders by the weighted average number of common shares and dilutive potential common shares outstanding during the year. Average closing common stock market prices are used to calculate the dilutive effect attributable to restricted stock.

	Years Ended December 31,
(in thousands, except per share amounts)	2016			2015		2014
Net income to shareholders	$	455,689		$	582,772	$	321,182
Adjustment of redeemable noncontrolling interests	(15,472		)	4,144		(8,186		)
Adjusted net income to shareholders	$	440,217		$	586,916	$	312,996
Basic common shares outstanding	14,013			13,978		13,984
Dilutive potential common shares from conversion of options	4			9		11
Dilutive potential common shares from conversion of restricted stock	61			74		62
Diluted shares outstanding	14,078			14,061		14,057
Basic net income per share	$	31.41		$	41.99	$	22.38
Diluted net income per share	$	31.27		$	41.74	$	22.27

c)The Company's Employee Stock Purchase and Bonus Plan provides a method for employees and directors to purchase shares of the Company's common stock on the open market. The plan encourages share ownership by providing for the award of bonus shares to participants equal to 10% of the net increase in the number of shares owned under the plan in a given year, excluding shares acquired through the plan's loan program component. Under the loan program, the Company offers subsidized unsecured loans so participants may purchase shares and awards bonus shares equal to 5% of the shares purchased with a loan. In May 2016, the Company adopted the Markel Corporation 2016 Employee Stock Purchase and Bonus Plan which replaced the Company's prior Employee Stock Purchase and Bonus Plan. No shares have been issued under the prior Employee Stock Purchase and Bonus Plan since the effective date of the 2016 Employee Stock Purchase and Bonus Plan. The Company authorized 125,000 shares for purchase under the 2016 Employee Stock Purchase and Bonus Plan, of which 118,692 shares were available for purchase as of December 31, 2016. As of December 31, 2015, 9,458 shares were available for purchase under the prior Employee Stock Purchase and Bonus Plan. At December 31, 2016 and 2015, loans outstanding under the plans, which are included in receivables on the consolidated balance sheets, totaled $20.2 million and $16.9 million, respectively.

d)In May 2016, the Company adopted the 2016 Equity Incentive Compensation Plan (2016 Compensation Plan), which replaced the 2012 Equity Incentive Compensation Plan (2012 Compensation Plan). In April 2012, the Company adopted the 2012 Compensation Plan, which replaced the Markel Corporation Omnibus Incentive Plan (Omnibus Incentive Plan). The 2016 Compensation Plan provides for grants and awards of restricted stock, restricted stock units, performance grants, and other stock based awards to employees and non-employee directors and is administered by the Compensation Committee of the Company's Board of Directors (Compensation Committee). No share-based awards have been issued under the 2012 Compensation Plan after the effective date of the 2016 Compensation Plan. At December 31, 2016, there were 248,025 shares available for future awards under the 2016 Compensation Plan.

Restricted stock units are awarded to certain associates and executive officers based upon meeting performance conditions determined by the Compensation Committee. These awards generally vest at the end of the third year following the year for which the Compensation Committee determines performance conditions have been met. At the end of the vesting period, recipients are entitled to receive one share of the Company's common stock for each vested restricted stock unit. During 2016, the Company awarded 12,664 restricted stock units to associates and executive officers based on performance conditions being met.

Restricted stock units also are awarded to associates to assist the Company in securing or retaining the services of key employees. During 2016, the Company awarded 1,900 restricted stock units to associates as a hiring or retention incentive. The restricted stock units had a grant-date fair value of $1.7 million. These awards generally vest over a three-year period and entitle the recipient to receive one share of the Company's common stock for each vested restricted stock unit.

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During 2016, the Company awarded 1,050 shares of restricted stock to its non-employee directors. The shares awarded to non-employee directors will vest in 2017.

The following table summarizes nonvested share-based awards.

	Number of Awards		Weighted Average Grant-Date Fair Value
Nonvested awards at January 1, 2016	103,883		$	556.66
Granted	15,614		878.03
Vested	(53,798	)	554.62
Forfeited	(81	)	632.82
Nonvested awards at December 31, 2016	65,618		$	634.71

The fair value of the Company's share-based awards issued under the Omnibus Incentive Plan was determined based on the average price of the Company's common shares on the grant date. The fair value of the Company's share-based awards granted under the 2012 Compensation Plan and 2016 Compensation Plan is determined based on the closing price of the Company's common shares on the grant date. The weighted average grant-date fair value of the Company's share-based awards granted in 2016, 2015 and 2014 was $878.03, $740.80 and $583.74, respectively. As of December 31, 2016, unrecognized compensation cost related to nonvested share-based awards was $10.7 million, which is expected to be recognized over a weighted average period of 1.6 years. The fair value of the Company's share-based awards that vested during 2016, 2015 and 2014 was $29.8 million, $15.8 million and $4.2 million, respectively.

13. Other Comprehensive Income (Loss)

Other comprehensive income (loss) includes net holding gains (losses) arising during the period, changes in unrealized other-than-temporary impairment losses on fixed maturities arising during the period and reclassification adjustments for net gains included in net income. Other comprehensive income (loss) also includes changes in foreign currency translation adjustments and changes in net actuarial pension loss.

The following table presents the change in accumulated other comprehensive income by component, net of taxes and noncontrolling interests.

(dollars in thousands)	Unrealized Holding Gains on Available-for- Sale Securities			Foreign Currency			Net Actuarial Pension Loss			Total
December 31, 2013	$	1,131,507		$	(11,246	)	$	(30,456	)	$	1,089,805
Other comprehensive income (loss) before reclassifications	687,908			(32,245		)	(16,516		)	639,147
Amounts reclassified from accumulated other comprehensive income	(26,161		)	—			1,766			(24,395		)
Total other comprehensive income (loss)	661,747			(32,245		)	(14,750		)	614,752
December 31, 2014	$	1,793,254		$	(43,491	)	$	(45,206	)	$	1,704,557
Other comprehensive loss before reclassifications	(240,010		)	(29,205		)	(2,482		)	(271,697		)
Amounts reclassified from accumulated other comprehensive income	(80,482		)	—			2,130			(78,352		)
Total other comprehensive loss	(320,492		)	(29,205		)	(352		)	(350,049		)
December 31, 2015	$	1,472,762		$	(72,696	)	$	(45,558	)	$	1,354,508
Other comprehensive income (loss) before reclassifications	275,696			(11,710		)	(20,700		)	243,286
Amounts reclassified from accumulated other comprehensive income	(33,528		)	—			1,600			(31,928		)
Total other comprehensive income (loss)	242,168			(11,710		)	(19,100		)	211,358
December 31, 2016	$	1,714,930		$	(84,406	)	$	(64,658	)	$	1,565,866

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The following table summarizes the tax expense (benefit) associated with each component of other comprehensive income (loss).

	Years Ended December 31,
(dollars in thousands)	2016			2015			2014
Change in net unrealized gains on investments:
Net holding gains (losses) arising during the period	$	112,399		$	(107,860	)	$	328,564
Change in unrealized other-than-temporary impairment losses on fixed maturities arising during the period	6			35			614
Reclassification adjustments for net gains included in net income	(12,462		)	(29,267		)	(9,890		)
Change in net unrealized gains on investments	99,943			(137,092		)	319,288
Change in foreign currency translation adjustments	1,037			408			1,918
Change in net actuarial pension loss	(4,192		)	(88		)	(3,687		)
Total	$	96,788		$	(136,772	)	$	317,519

The following table presents the details of amounts reclassified from accumulated other comprehensive income into income, by component.

	Years Ended December 31,
(dollars in thousands)	2016			2015			2014
Unrealized holding gains on available-for-sale securities:
Other-than-temporary impairment losses	$	(18,355	)	$	(44,481	)	$	(4,784	)
Net realized investment gains, excluding other-than-temporary impairment losses	64,345			154,230			40,835
Total before taxes	45,990			109,749			36,051
Income taxes	(12,462		)	(29,267		)	(9,890		)
Reclassification of unrealized holding gains, net of taxes	$	33,528		$	80,482		$	26,161
Net actuarial pension loss:
Underwriting, acquisition and insurance expenses	$	(1,951	)	$	(2,662	)	$	(2,084	)
Income taxes	351			532			318
Reclassification of net actuarial pension loss, net of taxes	$	(1,600	)	$	(2,130	)	$	(1,766	)

14. Fair Value Measurements

FASB ASC 820-10, Fair Value Measurements and Disclosures, establishes a three-level hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The fair value hierarchy gives the highest priority to quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). If the inputs used to measure the assets or liabilities fall within different levels of the hierarchy, the classification is based on the lowest level input that is significant to the fair value measurement of the asset or liability.

Classification of assets and liabilities within the hierarchy considers the markets in which the assets and liabilities are traded and the reliability and transparency of the assumptions used to determine fair value. The hierarchy requires the use of observable market data when available. The levels of the hierarchy are defined as follows:

Level 1 - Inputs to the valuation methodology are quoted prices (unadjusted) for identical assets or liabilities traded in active markets.

Level 2 - Inputs to the valuation methodology include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability and market-corroborated inputs.

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Level 3 - Inputs to the valuation methodology are unobservable for the asset or liability and are significant to the fair value measurement.

In accordance with FASB ASC 820, the Company determines fair value based on the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. In determining fair value, the Company uses various methods, including the market, income and cost approaches. The Company uses valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs. The following section describes the valuation methodologies used by the Company to measure assets and liabilities at fair value, including an indication of the level within the fair value hierarchy in which each asset or liability is generally classified.

Investments available-for-sale. Investments available-for-sale are recorded at fair value on a recurring basis and include fixed maturity securities, equity securities and short-term investments. Short-term investments include certificates of deposit, commercial paper, discount notes and treasury bills with original maturities of one year or less. Fair value for investments available-for-sale is determined by the Company after considering various sources of information, including information provided by a third party pricing service. The pricing service provides prices for substantially all of the Company's fixed maturity securities and equity securities. In determining fair value, the Company generally does not adjust the prices obtained from the pricing service. The Company obtains an understanding of the pricing service's valuation methodologies and related inputs, which include, but are not limited to, reported trades, benchmark yields, issuer spreads, bids, offers, duration, credit ratings, estimated cash flows and prepayment speeds. The Company validates prices provided by the pricing service by reviewing prices from other pricing sources and analyzing pricing data in certain instances.

The Company has evaluated the various types of securities in its investment portfolio to determine an appropriate fair value hierarchy level based upon trading activity and the observability of market inputs. Level 1 investments include those traded on an active exchange, such as the New York Stock Exchange. Level 2 investments include U.S. Treasury securities, U.S. government-sponsored enterprises, municipal bonds, foreign government bonds, commercial mortgage-backed securities, residential mortgage-backed securities, asset-backed securities and corporate debt securities. Level 3 investments include the Company's investments in insurance-linked securities funds (the ILS Funds), as further described in note 17, which are not traded on an active exchange and are valued using unobservable inputs.

Fair value for investments available-for-sale is measured based upon quoted prices in active markets, if available. Due to variations in trading volumes and the lack of quoted market prices, fixed maturities are classified as Level 2 investments. The fair value of fixed maturities is normally derived through recent reported trades for identical or similar securities, making adjustments through the reporting date based upon available market observable data described above. If there are no recent reported trades, the fair value of fixed maturities may be derived through the use of matrix pricing or model processes, where future cash flow expectations are developed based upon collateral performance and discounted at an estimated market rate. Significant inputs used to determine the fair value of obligations of states, municipalities and political subdivisions, corporate bonds and obligations of foreign governments include reported trades, benchmark yields, issuer spreads, bids, offers, credit information and estimated cash flows. Significant inputs used to determine the fair value of commercial mortgage-backed securities, residential mortgage-backed securities and asset-backed securities include the type of underlying assets, benchmark yields, prepayment speeds, collateral information, tranche type and volatility, estimated cash flows, credit information, default rates, recovery rates, issuer spreads and the year of issue.

Due to the significance of unobservable inputs required in measuring the fair value of the Company's investments in the ILS Funds, these investments are classified as Level 3 within the fair value hierarchy. Changes in fair value of the ILS Funds are included in net realized gains (losses) in net income. The fair value of the securities are derived using their reported net asset value (NAV) as the primary input, as well as other observable and unobservable inputs as deemed necessary by management. Management has obtained an understanding of the inputs, assumptions, process, and controls used to determine NAV, which is calculated by an independent third party. Unobservable inputs to the NAV calculations include assumptions around premium earnings patterns and loss reserve estimates for the underlying securitized reinsurance contracts in which the ILS Funds invest. Significant unobservable inputs used in the valuation of these investments include an adjustment to include the fair value of the equity that was issued by one of the ILS Funds in exchange for notes receivable, rather than cash, which is excluded from NAV. The Company's investments in the ILS Funds are redeemable annually as of January 1^st of each calendar year.

The Company's valuation policies and procedures for Level 3 investments are determined by management. Fair value measurements are analyzed quarterly to ensure the change in fair value from prior periods is reasonable relative to management's understanding of the underlying investments, recent market trends and external market data, which includes the price of a comparable security and an insurance-linked security index.

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Senior long-term debt and other debt. Senior long-term debt and other debt is carried at amortized cost with the estimated fair value disclosed on the consolidated balance sheets. Senior long-term debt and other debt is classified as Level 2 within the fair value hierarchy due to variations in trading volumes and the lack of quoted market prices. Fair value for senior long-term debt and other debt is generally derived through recent reported trades for identical securities, making adjustments through the reporting date, if necessary, based upon available market observable data including U.S. Treasury securities and implied credit spreads. Significant inputs used to determine the fair value of senior long-term debt and other debt include reported trades, benchmark yields, issuer spreads, bids and offers.

The following tables present the balances of assets measured at fair value on a recurring basis by level within the fair value hierarchy.

	December 31, 2016
(dollars in thousands)	Level 1		Level 2		Level 3		Total
Assets:
Investments available-for-sale:
Fixed maturity securities:
U.S. Treasury	$	—	$	258,584	$	—	$	258,584
U.S. government-sponsored enterprises	—		423,212		—		423,212
Obligations of states, municipalities and political subdivisions	—		4,428,205		—		4,428,205
Foreign governments	—		1,463,462		—		1,463,462
Commercial mortgage-backed	—		1,040,356		—		1,040,356
Residential mortgage-backed	—		790,946		—		790,946
Asset-backed	—		27,338		—		27,338
Corporate	—		1,459,407		—		1,459,407
Total fixed maturity securities	—		9,891,510		—		9,891,510
Equity securities:
Insurance, banks and other financial institutions	1,506,607		—		191,203		1,697,810
Industrial, consumer and all other	3,048,031		—		—		3,048,031
Total equity securities	4,554,638		—		191,203		4,745,841
Short-term investments	2,255,898		80,253		—		2,336,151
Total investments available-for-sale	$	6,810,536	$	9,971,763	$	191,203	$	16,973,502

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	December 31, 2015
(dollars in thousands)	Level 1		Level 2		Level 3		Total
Assets:
Investments available-for-sale:
Fixed maturity securities:
U.S. Treasury	$	—	$	309,417	$	—	$	309,417
U.S. government-sponsored enterprises	—		391,290		—		391,290
Obligations of states, municipalities and political subdivisions	—		4,013,213		—		4,013,213
Foreign governments	—		1,416,457		—		1,416,457
Commercial mortgage-backed	—		659,538		—		659,538
Residential mortgage-backed	—		854,247		—		854,247
Asset-backed	—		36,071		—		36,071
Corporate	—		1,714,235		—		1,714,235
Total fixed maturity securities	—		9,394,468		—		9,394,468
Equity securities:
Insurance, banks and other financial institutions	1,334,722		—		—		1,334,722
Industrial, consumer and all other	2,739,753		—		—		2,739,753
Total equity securities	4,074,475		—		—		4,074,475
Short-term investments	1,529,924		112,337		—		1,642,261
Total investments available-for-sale	$	5,604,399	$	9,506,805	$	—	$	15,111,204

The following table summarizes changes in Level 3 investments measured at fair value on a recurring basis.

(dollars in thousands)	2016			2015
Equity securities, beginning of period	$	—		$	—
Purchases	195,250			—
Sales	(25,000		)	—
Total gains included in:
Net income	20,953			—
Other comprehensive income (loss)	—			—
Transfers into Level 3	—			—
Transfers out of Level 3	—			—
Equity securities, end of period	$	191,203		$	—
Net unrealized gains included in net income relating to assets held at December 31, 2016 and 2015 (1)	$	20,953		$	—

⁽¹⁾Included in net realized investment gains in the consolidated statements of income and comprehensive income.

There were no transfers into or out of Level 1 and Level 2 during 2016 or 2015.

The Company did not have any assets or liabilities measured at fair value on a non-recurring basis during the years ended December 31, 2016 and 2015.

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15. Reinsurance

The Company uses reinsurance and retrocessional reinsurance to manage its net retention on individual risks and overall exposure to losses while providing it with the ability to offer policies with sufficient limits to meet policyholder needs. In reinsurance and retrocession transactions, an insurance or reinsurance company transfers, or cedes, all or part of its exposure in return for a portion of the premium. The ceding of insurance does not legally discharge the Company from its primary liability for the full amount of the policies, and the Company will be required to pay the loss and bear collection risk if the reinsurer fails to meet its obligations under the reinsurance or retrocessional agreement.

A credit risk exists with ceded reinsurance to the extent that any reinsurer is unable to meet the obligations assumed under the reinsurance or retrocessional contracts. Allowances are established for amounts deemed uncollectible. The Company evaluates the financial condition of its reinsurers and monitors concentration of credit risk arising from its exposure to individual reinsurers. At December 31, 2016 and 2015, balances recoverable from the Company's ten largest reinsurers, by group, represented approximately 67% and 68%, respectively, of the reinsurance recoverable on paid and unpaid losses, before considering reinsurance allowances. At December 31, 2016, the Company's largest reinsurance balance was due from the Fairfax Financial Group and represented 15% of the reinsurance recoverable on paid and unpaid losses, before considering reinsurance allowances.

To further reduce credit exposure to reinsurance recoverable balances, the Company has received collateral, including letters of credit and trust accounts, from certain reinsurers. Collateral related to these reinsurance agreements is available, without restriction, when the Company pays losses covered by the reinsurance agreements.

The following table summarizes the Company's reinsurance allowance for doubtful accounts.

	Years Ended December 31,
(dollars in thousands)	2016			2015			2014
Reinsurance allowance, beginning of year	$	59,350		$	59,813		$	76,210
Additions	980			5,897			10,316
Deductions	(23,560		)	(6,360		)	(26,713		)
Reinsurance allowance, end of year	$	36,770		$	59,350		$	59,813

Management believes the Company's reinsurance allowance for doubtful accounts is adequate at December 31, 2016; however, the deterioration in the credit quality of existing reinsurers or disputes over reinsurance and retrocessional contracts could result in additional charges.

The following table summarizes the effect of reinsurance and retrocessional reinsurance on premiums written and earned.

	Years Ended December 31,
	2016						2015						2014
(dollars in thousands)	Written			Earned			Written			Earned			Written			Earned
Direct	$	3,560,635		$	3,506,687		$	3,474,510		$	3,480,297		$	3,478,273		$	3,443,912
Assumed	1,236,010			1,176,205			1,158,402			1,194,772			1,327,240			1,298,371
Ceded	(795,625		)	(817,022		)	(813,619		)	(851,537		)	(888,498		)	(901,371		)
Net premiums	$	4,001,020		$	3,865,870		$	3,819,293		$	3,823,532		$	3,917,015		$	3,840,912

Incurred losses and loss adjustment expenses were net of reinsurance recoverables (ceded incurred losses and loss adjustment expenses) of $362.0 million, $330.7 million and $423.1 million for the years ended December 31, 2016, 2015 and 2014, respectively.

The percentage of ceded earned premiums to gross earned premiums was 17%, 18% and 19% for the years ended December 31, 2016, 2015 and 2014, respectively. The percentage of assumed earned premiums to net earned premiums was 30%, 31% and 34% for the years ended December 31, 2016, 2015 and 2014, respectively.

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See note 9 of the notes to consolidated financial statements for information regarding two retroactive reinsurance transactions completed during 2015 to cede portfolios of policies primarily comprised of liabilities arising from A&E exposures.

16. Commitments and Contingencies

a)The Company leases substantially all of its facilities and certain furniture and equipment under noncancelable operating leases with remaining terms up to 18 years.

The following table summarizes the Company's minimum annual rental commitments, excluding taxes, insurance and other operating costs payable directly by the Company, for noncancelable operating leases at December 31, 2016.

Years Ending December 31,	(dollars in thousands)
2017	$	34,449
2018	31,883
2019	29,270
2020	21,536
2021	21,140
2022 and thereafter	95,979
Total	$	234,257

Rental expense was $40.2 million, $44.3 million and $42.7 million for the years ended December 31, 2016, 2015 and 2014, respectively.

b)Contingencies arise in the normal course of the Company's operations and are not expected to have a material impact on the Company's financial condition or results of operations.

17. Variable Interest Entities

In December 2015, the Company formed MCIM, a wholly owned consolidated subsidiary. MCIM is an insurance-linked securities investment fund manager and insurance manager headquartered in Bermuda. Results attributable to MCIM are included with the Company's non-insurance operations, which are not included in a reportable segment.

In December 2015, the Company also formed a mutual fund company and reinsurance company, both of which were organized under Bermuda law and are managed by MCIM. The mutual fund company issues multiple classes of nonvoting, redeemable preference shares to investors through its funds (the Funds) and the Funds are primarily invested in nonvoting shares of the reinsurance company. The underwriting results of the reinsurance company are attributed to the Funds through the issuance of nonvoting preference shares.

The Funds and the reinsurance company are considered VIEs, as their preference shareholders have no voting rights. MCIM has the power to direct the activities that most significantly impact the economic performance of these entities, but does not have a variable interest in any of the entities. Except as described below, the Company is not the primary beneficiary of the Funds or the reinsurance company, as the Company's involvement is generally limited to that of an investment or insurance manager, receiving fees that are at market and commensurate with the level of effort required. Investment management fees earned by the Company from unconsolidated Funds for the year ended December 31, 2016 were $56.5 million. The Company is the sole investor in one of the Funds, the Markel Diversified Fund, and consolidates that fund as its primary beneficiary. The Company also holds an investment in another one of the Funds ($26.1 million as of December 31, 2016) but does not have the obligation to absorb losses or right to receive benefits from the VIE that could potentially be significant to the VIE, and therefore does not consolidate that Fund.

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As of December 31, 2016, total assets of the Markel Diversified Fund were $166.8 million and total liabilities were $64.6 million. The assets of the Markel Diversified Fund are available for use only by the Markel Diversified Fund, and are not available for use by the Company. Total assets of the Markel Diversified Fund include an investment in one of the unconsolidated Funds totaling $165.1 million as of December 31, 2016, which represents 6% of the outstanding preference shares of that fund. This investment is included in equity securities (available-for-sale) on the Company's consolidated balance sheet. Total liabilities of the Markel Diversified Fund include a $62.5 million note payable delivered as part of the consideration provided for its investment. This note payable is included in senior long-term debt and other debt on the Company's consolidated balance sheet. Other than the note payable, any liabilities held by the Markel Diversified Fund have no recourse to the Company's general credit.

The Company's exposure to risk from the unconsolidated Funds and reinsurance company is generally limited to its investment and any earned but uncollected fees. The Company has not issued any investment performance guarantees to these VIEs or their investors. As of December 31, 2016, total investment and insurance assets under management of MCIM for unconsolidated VIEs were $3.4 billion.

18. Related Party Transactions

The Company engages in certain related party transactions in the normal course of business. These transactions are at arm's length and are not material to the Company's consolidated financial statements. See note 17 for a discussion of the Company's related party transactions with unconsolidated VIEs.

19. Statutory Financial Information

a) Statutory capital and surplus and statutory net income (loss) for the Company's insurance subsidiaries as of December 31, 2016 and 2015 and for the years ended December 31, 2016, 2015 and 2014, respectively, is summarized below.

Statutory Capital and Surplus
(dollars in thousands)	2016		2015
United States	$	2,761,454	$	2,569,928
United Kingdom	$	682,477	$	603,238
Bermuda	$	2,189,649	$	1,964,844
Other	$	24,726	$	17,305

As of December 31, 2016, the amount of statutory capital and surplus necessary to satisfy regulatory requirements is not significant in relation to actual statutory capital and surplus.

Statutory Net Income (Loss)
	Years Ended December 31,
(dollars in thousands)	2016			2015			2014
United States	$	249,176		$	291,783		$	212,909
United Kingdom	$	77,909		$	74,330		$	73,697
Bermuda	$	132,442		$	185,289		$	110,401
Other	$	(891	)	$	(3,181	)	$	1,367

The Solvency II Directive that governs the calculation of statutory capital and surplus for the Company's United Kingdom insurance subsidiary does not provide requirements for the calculation of net income. Amounts presented in the table above have been calculated in accordance with United Kingdom GAAP.

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United States

The laws of the domicile states of the Company's U.S. insurance subsidiaries govern the amount of dividends that may be paid to the Company. Generally, statutes in the domicile states of the Company's U.S. insurance subsidiaries require prior approval for payment of extraordinary, as opposed to ordinary, dividends. At December 31, 2016, the Company's U.S. insurance subsidiaries could pay up to $330.4 million during the following 12 months under the ordinary dividend regulations.

In converting from U.S. statutory accounting principles to U.S. GAAP, typical adjustments include deferral of policy acquisition costs, differences in the calculation of deferred income taxes and the inclusion of net unrealized gains or losses relating to fixed maturities in shareholders' equity. The Company does not use any permitted statutory accounting practices that are different from prescribed statutory accounting practices which impact statutory capital and surplus.

United Kingdom

The Company's United Kingdom insurance subsidiary, Markel International Insurance Company Limited (MIICL), and its Lloyd's managing agent, Markel Syndicate Management Limited (MSM), are authorized by the Prudential Regulation Authority (PRA) and regulated by both the PRA and the Financial Conduct Authority (FCA). The PRA oversees compliance with established periodic auditing and reporting requirements, minimum solvency margins and individual capital assessment requirements under the Solvency II Directive and imposes dividend restrictions, while both the PRA and the FCA oversee compliance with risk assessment reviews and various other requirements. MIICL is required to give advance notice to the PRA for any dividends from MIICL and any transaction or proposed transaction with a connected or related person. MSM is required to satisfy the solvency requirements of Lloyd's. In addition, the Company's United Kingdom subsidiaries must comply with the United Kingdom Companies Act of 2006, which provides that dividends may only be paid out of profits available for that purpose. As of December 31, 2016, earnings of the Company's United Kingdom subsidiaries, to the extent not previously taxed in the United States, are considered reinvested indefinitely for U.S. income tax purposes and will not be made available for distributions to the holding company.

Bermuda

The Company's Bermuda insurance subsidiary, Markel Bermuda Limited (Markel Bermuda), is subject to enhanced capital requirements in addition to minimum solvency and liquidity requirements. The enhanced capital requirement is determined by reference to a risk-based capital model that determines a control threshold for statutory capital and surplus by taking into account the risk characteristics of different aspects of the insurer's business. At December 31, 2016, Markel Bermuda satisfied both the enhanced capital requirements and the minimum solvency and liquidity requirements.

Under the Bermuda Insurance Act, Markel Bermuda is prohibited from paying or declaring dividends during a fiscal year if it is in breach of its enhanced capital requirement, solvency margin or minimum liquidity ratio or if the declaration or payment of the dividend would cause a breach of those requirements. If an insurer fails to meet its solvency margin or minimum liquidity ratio on the last day of any financial year, it is prohibited from declaring or paying any dividends during the next financial year without the approval of the Bermuda Monetary Authority (BMA). Further, Markel Bermuda is prohibited from declaring or paying, in any financial year, dividends of more than 25% of its total statutory capital and surplus as set forth in its previous year's statutory balance sheet unless at least seven days before payment of those dividends it files with the BMA an affidavit stating that it will continue to meet its solvency margin and minimum liquidity ratio. Markel Bermuda must obtain the BMA's prior approval for a reduction by 15% or more of the total statutory capital as set forth in its previous year's financial statements. In addition, as a long-term insurer, Markel Bermuda may not declare or pay a dividend to any person other than a policyholder unless the value of the assets in its long-term business fund, as certified by Markel Bermuda's approved actuary, exceeds the liabilities of its long-term business. The amount of the dividend cannot exceed the aggregate of that excess and any other funds legally available for the payment of the dividend. As of December 31, 2016, Markel Bermuda could pay up to $547.4 million during the following 12 months without making any additional filings with the BMA.

Other Jurisdictions

The Company's other foreign subsidiaries are subject to capital and solvency requirements in their respective jurisdictions of domicile that govern their ability to declare and pay dividends. As of December 31, 2016, earnings of our foreign subsidiaries, to the extent not previously taxed in the United States, are considered reinvested indefinitely for U.S. income tax purposes and will not be made available for distributions to the holding company.

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b)    Lloyd's sets the corporate members' required capital annually based on each syndicates' business plans, rating environment, reserving environment and input arising from Lloyd's discussions with, inter alia, regulatory and rating agencies. Such required capital is referred to as Funds at Lloyd's (FAL), and comprises cash and investments. The amount of cash and investments held as FAL as of December 31, 2016 was $784.9 million. The amount which the Company provides as FAL is not available for distribution to the holding company. The Company's corporate members may also be required to maintain funds under the control of Lloyd's in excess of their capital requirements and such funds also may not be available for distribution to the holding company.

20. Segment Reporting Disclosures

The Company monitors and reports its ongoing underwriting operations in the following three segments: U.S. Insurance, International Insurance and Reinsurance. In determining how to aggregate and monitor its underwriting results, the Company considers many factors, including the geographic location and regulatory environment of the insurance entity underwriting the risk, the nature of the insurance product sold, the type of account written and the type of customer served. The U.S. Insurance segment includes all direct business and facultative reinsurance placements written by the Company's insurance subsidiaries domiciled in the United States. The International Insurance segment includes all direct business and facultative reinsurance placements written by the Company's insurance subsidiaries domiciled outside of the United States, including the Company's syndicate at Lloyd's of London. The Reinsurance segment includes all treaty reinsurance written across the Company. Results for lines of business discontinued prior to, or in conjunction with, acquisitions, including results attributable to the run-off of life and annuity reinsurance business, are reported in the Other Insurance (Discontinued Lines) segment. All investing activities related to the Company's insurance operations are included in the Investing segment.

The Company's non-insurance operations include its Markel Ventures operations, which primarily consist of controlling interests in various industrial and service businesses. The Company's non-insurance operations also include the results of the Company's legal and professional consulting services, and, effective December 8, 2015, the results of the Company's investment management services attributable to MCIM. For purposes of segment reporting, the Company's non-insurance operations are not considered a reportable segment.

The following table summarizes the Company's gross written premiums by country. Gross written premiums are attributed to individual countries based upon location of risk or cedent.

	Years Ended December 31,
(dollars in thousands)	2016		% of Total		2015		% of Total		2014		% of Total
United States	$	3,691,840	77	%	$	3,519,487	76	%	$	3,523,239	73	%
United Kingdom	358,348		7		414,941		9		441,669		9
Canada	125,444		3		115,191		2		125,617		3
Other countries	621,013		13		583,293		13		714,988		15
Total	$	4,796,645	100	%	$	4,632,912	100	%	$	4,805,513	100	%

Most of the Company's gross written premiums are placed through insurance and reinsurance brokers. During the years ended December 31, 2016, 2015 and 2014, the top three independent brokers accounted for approximately 28%, 27% and 28% of consolidated gross premiums written. During the years ended December 31, 2016, 2015 and 2014, the top three independent brokers accounted for approximately 40%, 42% and 41%, respectively, of gross premiums written in the International Insurance segment and 75%, 68% and 68%, respectively, of gross premiums written in the Reinsurance segment.

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Segment profit for the Investing segment is measured by net investment income and net realized investment gains or losses. Segment profit or loss for each of the Company's underwriting segments is measured by underwriting profit or loss. The property and casualty insurance industry commonly defines underwriting profit or loss as earned premiums net of losses and loss adjustment expenses and underwriting, acquisition and insurance expenses. Underwriting profit or loss does not replace operating income or net income computed in accordance with U.S. GAAP as a measure of profitability. Underwriting profit or loss provides a basis for management to evaluate the Company's underwriting performance. Segment profit or loss for the Company's underwriting segments also includes other revenues and other expenses, primarily related to the run-off of managing general agent operations that were discontinued in conjunction with acquisitions. Other revenues and other expenses in the Other Insurance (Discontinued Lines) segment are comprised of the results attributable to the run-off of life and annuity reinsurance business.

For management reporting purposes, the Company allocates assets to its underwriting, investing and non-insurance operations. Underwriting assets are all assets not specifically allocated to the Investing segment or to the Company's non-insurance operations. Underwriting and investing assets are not allocated to the U.S. Insurance, International Insurance, Reinsurance or Other Insurance (Discontinued Lines) segments since the Company does not manage its assets by underwriting segment. The Company does not allocate capital expenditures for long-lived assets to any of its underwriting segments for management reporting purposes.

a) The following tables summarize the Company's segment disclosures.

	Year Ended December 31, 2016
(dollars in thousands)	U.S. Insurance			International Insurance			Reinsurance			Other Insurance (Discontinued Lines)				Investing		Consolidated
Gross premium volume	$	2,635,266		$	1,119,815		$	1,041,055		$	509			$	—	$	4,796,645
Net written premiums	2,237,163			864,494			898,728			635				—		4,001,020
Earned premiums	2,175,332			853,512			836,264			762				—		3,865,870
Losses and loss adjustment expenses:
Current accident year	(1,403,589		)	(605,837		)	(546,476		)	—				—		(2,555,902		)
Prior accident years	204,881			164,713			125,514			10,050				—		505,158
Amortization of policy acquisition costs	(446,649		)	(146,117		)	(189,455		)	—				—		(782,221		)
Other operating expenses	(377,230		)	(219,066		)	(119,012		)	(1,061		)		—		(716,369		)
Underwriting profit	152,745			47,205			106,835			9,751				—		316,536
Net investment income	—			—			—			—				373,230		373,230
Net realized investment gains	—			—			—			—				65,147		65,147
Other revenues (insurance)	7,143			5,560			—			1,891				—		14,594
Other expenses (insurance)	(15,407		)	(5,712		)	—			(26,504		)		—		(47,623		)
Segment profit (loss)	$	144,481		$	47,053		$	106,835		$	(14,862	)		$	438,377	$	721,884
Other revenues (non-insurance)																1,293,185
Other expenses (non-insurance)																(1,142,620		)
Amortization of intangible assets																(68,533		)
Interest expense																(129,896		)
Loss on early extinguishment of debt																(44,100		)
Income before income taxes																$	629,920
U.S. GAAP combined ratio (1)	93		%	94		%	87		%	NM			(2)			92		%

⁽¹⁾  The U.S. GAAP combined ratio is a measure of underwriting performance and represents the relationship of incurred losses, loss adjustment expenses and underwriting, acquisition and insurance expenses to earned premiums.

⁽²⁾  NM — Ratio is not meaningful.

84

	Year Ended December 31, 2015
(dollars in thousands)	U.S. Insurance			International Insurance			Reinsurance			Other Insurance (Discontinued Lines)				Investing		Consolidated
Gross premium volume	$	2,504,096		$	1,164,866		$	965,374		$	(1,424	)		$	—	$	4,632,912
Net written premiums	2,106,490			888,214			824,324			265				—		3,819,293
Earned premiums	2,105,212			879,426			838,543			351				—		3,823,532
Losses and loss adjustment expenses:
Current accident year	(1,367,159		)	(638,144		)	(561,242		)	—				—		(2,566,545		)
Prior accident years	298,967			248,834			97,860			(17,861		)		—		627,800
Amortization of policy acquisition costs	(420,289		)	(142,657		)	(182,018		)	—				—		(744,964		)
Other operating expenses	(378,563		)	(221,758		)	(106,863		)	(2,932		)		—		(710,116		)
Underwriting profit (loss)	238,168			125,701			86,280			(20,442		)		—		429,707
Net investment income	—			—			—			—				353,213		353,213
Net realized investment gains	—			—			—			—				106,480		106,480
Other revenues (insurance)	3,331			7,790			593			617				—		12,331
Other expenses (insurance)	(3,902		)	(5,717		)	(1,419		)	(29,057		)		—		(40,095		)
Segment profit (loss)	$	237,597		$	127,774		$	85,454		$	(48,882	)		$	459,693	$	861,636
Other revenues (non-insurance)																1,074,427
Other expenses (non-insurance)																(1,006,710		)
Amortization of intangible assets																(68,947		)
Interest expense																(118,301		)
Income before income taxes																$	742,105
U.S. GAAP combined ratio (1)	89		%	86		%	90		%	NM			(2)			89		%

⁽¹⁾  The U.S. GAAP combined ratio is a measure of underwriting performance and represents the relationship of incurred losses, loss adjustment expenses and underwriting, acquisition and insurance expenses to earned premiums.

⁽²⁾  NM — Ratio is not meaningful.

85

	Year Ended December 31, 2014
(dollars in thousands)	U.S. Insurance			International Insurance			Reinsurance			Other Insurance (Discontinued Lines)				Investing		Consolidated
Gross premium volume	$	2,493,823		$	1,200,403		$	1,112,728		$	(1,441	)		$	—	$	4,805,513
Net written premiums	2,071,466			889,336			956,584			(371		)		—		3,917,015
Earned premiums	2,022,860			909,679			908,385			(12		)		—		3,840,912
Losses and loss adjustment expenses:
Current accident year	(1,340,129		)	(660,409		)	(637,474		)	—				—		(2,638,012		)
Prior accident years	216,557			166,615			79,951			(27,578		)		—		435,545
Amortization of policy acquisition costs	(403,233		)	(141,394		)	(110,289		)	—				—		(654,916		)
Other operating expenses	(396,737		)	(207,175		)	(201,673		)	(381		)		—		(805,966		)
Underwriting profit (loss)	99,318			67,316			38,900			(27,971		)		—		177,563
Net investment income	—			—			—			—				363,230		363,230
Net realized investment gains	—			—			—			—				46,000		46,000
Other revenues (insurance)	2,478			21,827			2,696			1,631				—		28,632
Other expenses (insurance)	(5,149		)	(18,706		)	(1,847		)	(37,132		)		—		(62,834		)
Segment profit (loss)	$	96,647		$	70,437		$	39,749		$	(63,472	)		$	409,230	$	552,591
Other revenues (non-insurance)																854,893
Other expenses (non-insurance)																(792,037		)
Amortization of intangible assets																(57,627		)
Interest expense																(117,442		)
Income before income taxes																$	440,378
U.S. GAAP combined ratio (1)	95		%	93		%	96		%	NM			(2)			95		%

⁽¹⁾  The U.S. GAAP combined ratio is a measure of underwriting performance and represents the relationship of incurred losses, loss adjustment expenses and underwriting, acquisition and insurance expenses to earned premiums.

⁽²⁾  NM — Ratio is not meaningful.

b)The following table summarizes deferred policy acquisition costs, unearned premiums and unpaid losses and loss adjustment expenses by segment.

(dollars in thousands)	Deferred Policy Acquisition Costs		Unearned Premiums		Unpaid Losses and Loss Adjustment Expenses
December 31, 2016
U.S. Insurance	$	176,348	$	1,166,914	$	3,849,541
International Insurance	51,948		445,183		3,062,725
Reinsurance	164,114		651,741		2,661,209
Other Insurance (Discontinued Lines)	—		—		542,187
Total	$	392,410	$	2,263,838	$	10,115,662
December 31, 2015
U.S. Insurance	$	162,289	$	1,105,456	$	3,720,429
International Insurance	48,913		467,158		3,140,000
Reinsurance	141,554		593,491		2,750,258
Other Insurance (Discontinued Lines)	—		—		641,266
Total	$	352,756	$	2,166,105	$	10,251,953

86

c)The following table summarizes segment earned premiums by major product grouping.

	Years Ended December 31,
(dollars in thousands)	2016		2015		2014
U.S. Insurance:
General liability	$	563,908	$	522,358	$	491,645
Professional liability	328,597		324,230		321,005
Property	270,026		264,232		266,019
Personal lines	364,843		325,811		299,442
Programs	263,783		277,829		244,216
Workers compensation	301,126		281,954		263,164
Other	83,049		108,798		137,369
Total U.S. Insurance	2,175,332		2,105,212		2,022,860
International Insurance:
General liability	111,291		124,198		146,178
Professional liability	272,010		268,637		285,300
Property	87,294		85,152		76,691
Marine and energy	242,070		262,307		287,263
Other	140,847		139,132		114,247
Total International Insurance	853,512		879,426		909,679
Reinsurance:
Property	288,771		265,373		270,461
Casualty	327,383		315,027		323,390
Auto	65,363		102,227		152,645
Other	154,747		155,916		161,889
Total Reinsurance	836,264		838,543		908,385
Other Insurance (Discontinued Lines)	762		351		(12		)
Total earned premiums	$	3,865,870	$	3,823,532	$	3,840,912

The Company does not manage products at this level of aggregation. The Company offers a diverse portfolio of products and manages these products in logical groupings within each operating segment.

d)The following table reconciles segment assets to the Company's consolidated balance sheets.

	December 31,
(dollars in thousands)	2016		2015		2014
Segment assets:
Investing	$	19,029,584	$	18,056,947	$	18,531,150
Underwriting	5,397,696		5,385,126		5,420,624
Total segment assets	24,427,280		23,442,073		23,951,774
Non-insurance operations	1,448,019		1,497,042		1,245,986
Total assets	$	25,875,299	$	24,939,115	$	25,197,760

87

21. Other Revenues and Other Expenses

The following table summarizes the components of other revenues and other expenses.

	Years Ended December 31,
	2016				2015				2014
(dollars in thousands)	Other Revenues		Other Expenses		Other Revenues		Other Expenses		Other Revenues		Other Expenses
Insurance:
Managing general agent operations	$	12,703	$	21,119	$	10,202	$	9,619	$	23,324	$	22,527
Life and annuity	1,891		26,504		617		29,057		1,631		37,132
Other	—		—		1,512		1,419		3,677		3,175
	14,594		47,623		12,331		40,095		28,632		62,834
Non-Insurance:
Markel Ventures: Manufacturing	784,745		675,620		755,802		677,054		575,353		513,668
Markel Ventures: Non-Manufacturing	429,704		396,323		291,714		301,004		262,767		261,551
Investment management	56,455		46,190		—		—		—		—
Other	22,281		24,487		26,911		28,652		16,773		16,818
	1,293,185		1,142,620		1,074,427		1,006,710		854,893		792,037
Total	$	1,307,779	$	1,190,243	$	1,086,758	$	1,046,805	$	883,525	$	854,871

The Company's Markel Ventures operations primarily consist of controlling interests in various industrial and service businesses and are viewed by management as separate and distinct from the Company's insurance operations. While each of the businesses is operated independently from one another, management aggregates financial results into two industry groups: manufacturing and non-manufacturing.

22. Employee Benefit Plans

a)The Company maintains defined contribution plans for employees of its United States insurance operations in accordance with Section 401(k) of the U.S. Internal Revenue Code of 1986. Employees of the Company's Markel Ventures subsidiaries are provided post-retirement benefits under separate plans. The Company also provides various defined contribution plans for employees of its international insurance and non-insurance operations, which are in line with local market terms and conditions of employment. Expenses relating to the Company's defined contribution plans were $30.1 million, $27.7 million and $27.2 million in 2016, 2015 and 2014, respectively.

b)The Terra Nova Pension Plan is a defined benefit plan which covers certain employees in our international insurance operations who meet the eligibility conditions set out in the plan. The plan has been closed to new participants since 2001. The cost of providing pensions for employees is charged to earnings over the average working life of employees according to actuarial recommendations. Final benefits are based on the employee's years of credited service and the higher of pensionable compensation received in the calendar year preceding retirement or the best average pensionable compensation received in any three consecutive years in the ten years preceding retirement. Effective April 1, 2012, employees are no longer accruing benefits for future service in the Terra Nova Pension Plan. The Company uses December 31 as the measurement date for the Terra Nova Pension Plan.

88

The following table summarizes the funded status of the Terra Nova Pension Plan and the amounts recognized on the accompanying consolidated balance sheets of the Company.

	Years Ended December 31,
(dollars in thousands)	2016			2015
Change in projected benefit obligation:
Projected benefit obligation at beginning of period	$	170,005		$	185,556
Interest cost	6,113			6,645
Plan settlements	—			(2,863		)
Benefits paid	(3,322		)	(3,970		)
Actuarial loss (gain)	38,485			(6,051		)
Effect of foreign currency rate changes	(32,663		)	(9,312		)
Projected benefit obligation at end of year	$	178,618		$	170,005
Change in plan assets:
Fair value of plan assets at beginning of period	$	186,727		$	201,399
Actual gain on plan assets	22,367			2,246
Employer contributions	3,577			—
Plan settlements	—			(2,766		)
Benefits paid	(3,322		)	(3,970		)
Effect of foreign currency rate changes	(33,705		)	(10,182		)
Fair value of plan assets at end of year	$	175,644		$	186,727
Funded status of the plan	$	(2,974	)	$	16,722
Net actuarial pension loss	85,110			61,818
Total	$	82,136		$	78,540

Net actuarial pension loss is recognized as a component of accumulated other comprehensive income, net of taxes. The asset or liability for pension benefits, also referred to as the funded status of the plan, at December 31, 2016 and 2015 was included in other assets on the consolidated balance sheets.

The following table presents the changes in plan assets and projected benefit obligation recognized in accumulated other comprehensive income.

	Years Ended December 31,
(dollars in thousands)	2016			2015			2014
Net actuarial loss	$	(25,243	)	$	(3,102	)	$	(20,521	)
Settlement loss recognized	—			343			—
Amortization of:
Net actuarial loss	1,951			2,319			1,589
Prior service costs	—			—			495
Tax benefit	4,192			88			3,687
Total other comprehensive loss	$	(19,100	)	$	(352	)	$	(14,750	)

89

The following table summarizes the components of net periodic benefit income and the weighted average assumptions for the Terra Nova Pension Plan.

	Years Ended December 31,
(dollars in thousands)	2016			2015			2014
Components of net periodic benefit income:
Interest cost	$	6,113		$	6,645		$	7,572
Expected return on plan assets	(9,124		)	(11,496		)	(12,812		)
Amortization of prior service cost	—			—			495
Amortization of net actuarial pension loss	1,951			2,319			1,589
Settlement loss recognized	—			343			—
Net periodic benefit income	$	(1,060	)	$	(2,189	)	$	(3,156	)
Weighted average assumptions as of December 31:
Discount rate	2.7		%	4.0		%	3.8		%
Expected return on plan assets	4.5		%	5.4		%	6.0		%
Rate of compensation increase	3.0		%	2.9		%	2.9		%

The projected benefit obligation and the net periodic benefit income are determined by independent actuaries using assumptions provided by the Company. In determining the discount rate, the Company uses the current yield on high-quality, fixed maturity investments that have maturities corresponding to the anticipated timing of estimated defined benefit payments. The decrease in the weighted average discount rate from 2015 to 2016 is due to a decrease in the yields on securities used to determine the discount rate during 2016. The expected return on plan assets is estimated based upon the anticipated average yield on plan assets using asset return assumptions for each asset class, and the cross-correlations between the asset classes, over a specified projection horizon. The decrease in the weighted average expected return on plan assets from 2015 to 2016 is due to changes in market conditions during 2016 that impacted projected returns. The rate of compensation increase is based upon historical experience and management's expectation of future compensation.

Management's discount rate and rate of compensation increase assumptions at December 31, 2016 were used to calculate the Company's projected benefit obligation. Management's discount rate, expected return on plan assets and rate of compensation increase assumptions at December 31, 2015 were used to calculate the net periodic benefit income for 2016. The Company estimates that net periodic benefit cost in 2017 will include an expense of $3.5 million resulting from the amortization of the net actuarial pension loss included as a component of accumulated other comprehensive income at December 31, 2016.

The fair values of each of the plan's assets are measured using quoted prices in active markets for identical assets, which represent Level 1 inputs within the fair value hierarchy established in FASB ASC 820-10. The following table summarizes the fair value of plan assets as of December 31, 2016 and 2015.

	December 31,
(dollars in thousands)	2016		2015
Plan assets:
Fixed maturity index funds	$	103,218	$	107,033
Equity security index funds	72,419		79,686
Cash and cash equivalents	7		8
Total	$	175,644	$	186,727

During 2014, the Company revised the target asset allocation and adjusted the investment balances to reduce risk while maintaining long-term return objectives. The Company's target asset allocation for the plan is 47% equity securities and 53% fixed maturities. At December 31, 2016, the actual allocation of assets in the plan was 41% equity securities and 59% fixed maturities. At December 31, 2015, the actual allocation of assets in the plan was 43% equity securities and 57% fixed maturities.

90

Investments are managed by a third party investment manager. Equity securities are invested in an index fund where 30% is indexed to United Kingdom equities and 70% is indexed to other markets. Assets are also invested in a mutual fund with a diversified global portfolio of equities, investment grade debt, property and cash. The primary objective of investing in these funds is to earn rates of return that are consistently in excess of inflation. Investing in equity securities, historically, has provided rates of return that are higher than investments in fixed maturities. Fixed maturity investments are allocated between five mutual funds; two index funds that include United Kingdom government securities, one index fund that includes securities issued by other foreign governments, one mutual fund that includes investment grade corporate bonds from the United Kingdom and foreign markets and one index fund that includes United Kingdom corporate securities. The assets in these funds are invested to meet the Company's obligations for current pensioners and those individuals nearing retirement. The plan does not invest in the Company's common shares.

At December 31, 2016 and 2015, the fair value of plan assets exceeded the plan's accumulated benefit obligation of $175.1 million and $164.8 million, respectively. The Company expects to make plan contributions of $3.2 million in 2017.

The benefits expected to be paid in each year from 2017 to 2021 are $3.0 million, $3.1 million, $3.1 million, $3.2 million and $3.3 million, respectively. The aggregate benefits expected to be paid in the five years from 2022 to 2026 are $17.4 million. The expected benefits to be paid are based on the same assumptions used to measure the Company's projected benefit obligation at December 31, 2016.

91

23. Markel Corporation (Parent Company Only) Financial Information

The following parent company only condensed financial information reflects the financial position, results of operations and cash flows of Markel Corporation.

CONDENSED BALANCE SHEETS

	December 31,
	2016		2015
	(dollars in thousands)
ASSETS
Investments, available-for-sale, at estimated fair value:
Fixed maturities (amortized cost of $51,181 in 2016 and $35,475 in 2015)	$	52,234	$	36,618
Equity securities (cost of $203,708 in 2016 and $204,289 in 2015)	367,156		311,405
Short-term investments (estimated fair value approximates cost)	1,729,400		755,619
Total Investments	2,148,790		1,103,642
Cash and cash equivalents	369,641		460,271
Restricted cash and cash equivalents	1,013		670
Receivables	20,477		17,200
Investments in consolidated subsidiaries	8,107,450		7,961,315
Notes receivable from subsidiaries	60,110		212,636
Other assets	97,364		89,747
Total Assets	$	10,804,845	$	9,845,481
LIABILITIES AND SHAREHOLDERS' EQUITY
Senior long-term debt	$	1,944,171	$	1,633,068
Notes payable to subsidiaries	285,000		300,000
Income taxes payable	25,240		4,262
Net deferred tax liability	25,902		7,498
Other liabilities	63,605		66,503
Total Liabilities	2,343,918		2,011,331
Total Shareholders' Equity	8,460,927		7,834,150
Total Liabilities and Shareholders' Equity	$	10,804,845	$	9,845,481

92

CONDENSED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME

	Years Ended December 31,
	2016			2015			2014
	(dollars in thousands)
REVENUES
Net investment income	$	9,561		$	2,565		$	5,354
Dividends on common stock of consolidated subsidiaries	349,622			187,496			217,121
Net realized investment gains:
Other-than-temporary impairment losses	(98		)	(3,455		)	(120		)
Net realized investment gains, excluding other-than-temporary impairment losses	1,166			75,000			3,873
Net realized investment gains	1,068			71,545			3,753
Total Revenues	360,251			261,606			226,228
EXPENSES
Interest expense	116,013			95,620			94,097
Loss on early extinguishment of debt	44,100			—			—
Other expenses	13,076			11,287			2,685
Total Expenses	173,189			106,907			96,782
Income Before Equity in Undistributed Earnings of Consolidated Subsidiaries and Income Taxes	187,062			154,699			129,446
Equity in undistributed earnings of consolidated subsidiaries	196,615			407,489			163,341
Income tax benefit	(72,012		)	(20,584		)	(28,395		)
Net Income to Shareholders	$	455,689		$	582,772		$	321,182
OTHER COMPREHENSIVE INCOME (LOSS) TO SHAREHOLDERS
Change in net unrealized gains on investments, net of taxes:
Net holding gains (losses) arising during the period	$	37,045		$	(41,861	)	$	32,118
Consolidated subsidiaries' net holding gains (losses) arising during the period	238,616			(198,309		)	655,617
Consolidated subsidiaries' change in unrealized other-than-temporary impairment losses on fixed maturities arising during the period	35			160			173
Reclassification adjustments for net gains included in net income to shareholders	(558		)	(45,273		)	(1,874		)
Consolidated subsidiaries' reclassification adjustments for net gains included in net income to shareholders	(32,970		)	(35,209		)	(24,287		)
Change in net unrealized gains on investments, net of taxes	242,168			(320,492		)	661,747
Change in foreign currency translation adjustments, net of taxes	(1,326		)	2,970			1,949
Consolidated subsidiaries' change in foreign currency translation adjustments, net of taxes	(10,384		)	(32,175		)	(34,194		)
Consolidated subsidiaries' change in net actuarial pension loss, net of taxes	(19,100		)	(352		)	(14,750		)
Total Other Comprehensive Income (Loss) to Shareholders	211,358			(350,049		)	614,752
Comprehensive Income to Shareholders	$	667,047		$	232,723		$	935,934

93

CONDENSED STATEMENTS OF CASH FLOWS

	Years Ended December 31,
	2016			2015			2014
	(dollars in thousands)
OPERATING ACTIVITIES
Net income to shareholders	$	455,689		$	582,772		$	321,182
Adjustments to reconcile net income to shareholders to net cash provided by operating activities	(120,564		)	(464,193		)	(218,396		)
Net Cash Provided By Operating Activities	335,125			118,579			102,786
INVESTING ACTIVITIES
Proceeds from sales of fixed maturities and equity securities	1,831			100,633			9,306
Proceeds from maturities, calls and prepayments of fixed maturities	11,960			24,945			15,710
Cost of fixed maturities and equity securities purchased	(29,110		)	(55,656		)	(687		)
Net change in short-term investments	(970,364		)	9,956			(109,728		)
Securities received from subsidiaries as dividends, repayment of notes receivable and return of capital	238,975			—			89,996
Return of capital from subsidiaries	21,021			—			—
Decrease in notes receivable due from subsidiaries	92,530			—			28,506
Capital contributions to subsidiaries	—			(228,578		)	(74,788		)
Cost of equity method investments	(3,100		)	(13,164		)	—
Change in restricted cash and cash equivalents	(343		)	289			51
Additions to property and equipment	(584		)	(305		)	(342		)
Other	(3,207		)	(376		)	(2,150		)
Net Cash Used By Investing Activities	(640,391		)	(162,256		)	(44,126		)
FINANCING ACTIVITIES
Additions to senior long-term debt	493,149			—			—
Increase in notes payable to subsidiaries	—			285,000			—
Repayment and retirement of senior long-term debt	(183,343		)	(2,000		)	—
Premiums and fees related to early extinguishment of debt	(43,691		)	—			—
Repurchases of common stock	(51,142		)	(31,491		)	(26,053		)
Issuance of common stock	4,623			4,752			5,691
Other	(4,960		)	3,985			(1,948		)
Net Cash Provided (Used) By Financing Activities	214,636			260,246			(22,310		)
Increase (decrease) in cash and cash equivalents	(90,630		)	216,569			36,350
Cash and cash equivalents at beginning of year	460,271			243,702			207,352
CASH AND CASH EQUIVALENTS AT END OF YEAR	$	369,641		$	460,271		$	243,702

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24. Quarterly Financial Information (unaudited)

The following table presents the unaudited quarterly results of consolidated operations for 2016, 2015 and 2014.

	Quarters Ended
(dollars in thousands, except per share amounts)	Mar. 31		June 30			Sept. 30			Dec. 31
2016
Operating revenues	$	1,376,182	$	1,375,937		$	1,431,282		$	1,428,625
Net income	163,646		80,673			83,421			132,703
Net income to shareholders	160,370		78,797			83,796			132,726
Comprehensive income (loss) to shareholders	396,994		209,942			89,161			(29,050		)
Net income per share:
Basic	$	11.21	$	5.44		$	5.62		$	9.14
Diluted	11.15		5.41			5.60			9.11
Common stock price ranges:
High	$	895.03	$	989.18		$	961.78		$	931.94
Low	805.03		880.01			909.84			811.05
2015
Operating revenues	$	1,302,154	$	1,304,605		$	1,342,764		$	1,420,460
Net income	194,006		92,453			104,410			198,273
Net income to shareholders	190,992		91,369			102,519			197,892
Comprehensive income (loss) to shareholders	281,807		(132,925		)	(51,143		)	134,984
Net income per share:
Basic	$	13.57	$	6.76		$	7.43		$	14.23
Diluted	13.49		6.72			7.39			14.14
Common stock price ranges:
High	$	783.50	$	821.00		$	898.08		$	937.91
Low	660.05		736.96			775.00			791.97
2014
Operating revenues	$	1,239,655	$	1,258,971		$	1,299,286		$	1,335,755
Net income	87,501		41,141			76,824			118,222
Net income to shareholders	87,716		40,068			75,803			117,595
Comprehensive income to shareholders	230,273		250,588			36,502			418,571
Net income per share:
Basic	$	6.28	$	2.67		$	5.33		$	8.10
Diluted	6.25		2.66			5.30			8.05
Common stock price ranges:
High	$	596.87	$	655.75		$	666.00		$	707.36
Low	527.17		593.76			623.90			632.65

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MANAGEMENT'S DISCUSSION & ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Our Business

The following discussion and analysis should be read in conjunction with Selected Financial Data, the consolidated financial statements and related notes and the discussion under "Risk Factors", "Critical Accounting Estimates" and "Safe Harbor and Cautionary Statement."

We are a diverse financial holding company serving a variety of niche markets. Our principal business markets and underwrites specialty insurance products. We believe that our specialty product focus and niche market strategy enable us to develop expertise and specialized market knowledge. We seek to differentiate ourselves from competitors by our expertise, service, continuity and other value-based considerations. We also own interests in various industrial and service businesses that operate outside of the specialty insurance marketplace. Our financial goals are to earn consistent underwriting and operating profits and superior investment returns to build shareholder value.

We monitor and report our ongoing underwriting operations in the following three segments: U.S. Insurance, International Insurance and Reinsurance. In determining how to aggregate and monitor our underwriting results, management considers many factors, including the geographic location and regulatory environment of the insurance entity underwriting the risk, the nature of the insurance product sold, the type of account written and the type of customer served.

The U.S. Insurance segment includes all direct business and facultative reinsurance placements written by our insurance subsidiaries domiciled in the United States. The International Insurance segment includes all direct business and facultative reinsurance placements written by our insurance subsidiaries domiciled outside of the United States, including our syndicate at Lloyd's of London (Lloyd's). The Reinsurance segment includes all treaty reinsurance written across the Company. Results for lines of business discontinued prior to, or in conjunction with, acquisitions, are reported in the Other Insurance (Discontinued Lines) segment. All investing activities related to our insurance operations are included in the Investing segment.

Our U.S. Insurance segment includes both hard-to-place risks written outside of the standard market on an excess and surplus lines basis and unique and hard-to-place risks that must be written on an admitted basis due to marketing and regulatory reasons. The following products are included in this segment: general liability, professional liability, catastrophe-exposed property, personal property, workers' compensation, specialty program insurance for well-defined niche markets, and liability coverages and other coverages tailored for unique exposures. Business in this segment is written through our Wholesale, Specialty and Global Insurance divisions. The Wholesale division writes commercial risks, primarily on an excess and surplus lines basis, using a network of wholesale brokers managed on a regional basis. The Specialty division writes program insurance and other specialty coverages for well-defined niche markets, primarily on an admitted basis. The Global Insurance division writes risks outside of the standard market on both an admitted and non-admitted basis. Global Insurance division business written by our U.S. insurance subsidiaries is included in this segment.

Our International Insurance segment writes risks that are characterized by either the unique nature of the exposure or the high limits of insurance coverage required by the insured. Risks written in the International Insurance segment are written on either a direct basis or a subscription basis, the latter of which means that loss exposures brought into the market are typically insured by more than one insurance company or Lloyd's syndicate. When we write business in the subscription market, we prefer to participate as lead underwriter in order to control underwriting terms, policy conditions and claims handling. Products offered within our International Insurance segment include primary and excess of loss property, excess liability, professional liability, marine and energy and liability coverages and other coverages tailored for unique exposures. Business included in this segment is produced through our Markel International and Global Insurance divisions. The Markel International division writes business worldwide from our London-based platform, which includes our syndicate at Lloyd's. Global Insurance division business written by our non-U.S. insurance subsidiaries, which primarily targets Fortune 1000 accounts, is included in this segment.

Our Reinsurance segment includes property, casualty and specialty treaty reinsurance products offered to other insurance and reinsurance companies globally through the broker market. Our treaty reinsurance offerings include both quota share and excess of loss reinsurance and are typically written on a participation basis, which means each reinsurer shares proportionally in the business ceded under the reinsurance treaty written. Principal lines of business include: property (including catastrophe-exposed property), professional liability, general casualty, credit, surety, auto and workers' compensation. Our reinsurance product offerings are underwritten by our Global Reinsurance division and our Markel International division.

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For purposes of segment reporting, the Other Insurance (Discontinued Lines) segment includes lines of business that have been discontinued prior to, or in conjunction with, acquisitions. The lines were discontinued because we believed some aspect of the product, such as risk profile or competitive environment, would not allow us to earn consistent underwriting profits. The Other Insurance (Discontinued Lines) segment also includes development on asbestos and environmental (A&E) loss reserves and the results attributable to the run-off of our life and annuity reinsurance business.

In December 2015, we completed the acquisition of substantially all of the assets of CATCo Investment Management Ltd. (CATCo IM) and CATCo-Re Ltd. CATCo IM was an insurance-linked securities investment fund manager and reinsurance manager headquartered in Bermuda focused on building and managing highly diversified, collateralized retrocession and reinsurance portfolios covering global property catastrophe risks. Following the acquisition, we are operating this business through Markel CATCo Investment Management Ltd. (MCIM). MCIM receives management fees for its investment management and insurance management services, as well as performance fees based on the annual performance of the investment funds that it manages. Results attributable to MCIM are included with our non-insurance operations, which are not included in a reportable segment. As of December 31, 2016, MCIM's total investment and insurance assets under management were $3.6 billion, which includes $3.4 billion for unconsolidated variable interest entities.

In January 2014, we completed the acquisition of 100% of the share capital of Abbey Protection plc (Abbey), an integrated specialty insurance and consultancy group headquartered in London. Abbey's business is focused on the underwriting and sale of insurance products to small and medium-sized enterprises and affinity groups in the United Kingdom providing protection against legal expenses and professional fees incurred as a result of legal actions or investigations by tax authorities, as well as providing a range of complementary legal and professional consulting services. Results attributable to Abbey's insurance operations are included in the International Insurance segment. Results attributable to Abbey's consultancy operations are included with our non-insurance operations, which are not included in a reportable segment.

Through our wholly owned subsidiary Markel Ventures, Inc. (Markel Ventures), we own interests in various industrial and service businesses that operate outside of the specialty insurance marketplace. These businesses are viewed by management as separate and distinct from our insurance operations and are comprised of a diverse portfolio of businesses from various industries. Local management teams oversee the day-to-day operations of these companies, while strategic decisions are made in conjunction with members of our executive management team. While each of these businesses is operated independently, we aggregate their financial results into two industry groups: manufacturing and non-manufacturing. Our manufacturing operations are comprised of manufacturers of transportation and other industrial equipment. Our non-manufacturing operations are comprised of businesses from several industry groups, including consumer goods and services (including healthcare) and business services. Our strategy in making these investments is similar to our strategy for purchasing equity securities. We seek to invest in profitable companies, with honest and talented management, that exhibit reinvestment opportunities and capital discipline, at reasonable prices. We intend to own the businesses acquired for a long period of time.

In December 2015, we acquired 80% of the outstanding shares of CapTech Ventures, Inc. (CapTech), a privately held company headquartered in Richmond, Virginia. CapTech is a management and IT consulting firm, providing services and solutions to a wide array of customers. Results attributable to CapTech are included with our non-insurance operations, which are not included in a reportable segment.

In July 2014, we acquired 100% of the outstanding shares of Cottrell, Inc. (Cottrell), a privately held company headquartered in Gainesville, Georgia. Cottrell is a leading manufacturer of over-the-road car hauler equipment and related car hauler parts. Results attributable to Cottrell are included with the Company's non-insurance operations, which are not included in a reportable segment.

For further discussion of our lines of business, principal products offered, distribution channels, competition, underwriting philosophy and our Markel Ventures operations, see the discussion under Business Overview.

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Critical Accounting Estimates

The accompanying consolidated financial statements and related notes have been prepared in accordance with U.S. generally accepted accounting principles (U.S. GAAP) and include the accounts of Markel Corporation and its subsidiaries, as well as any variable interest entities that meet the requirements for consolidation (the Company). For a discussion of our significant accounting policies, see note 1 of the notes to consolidated financial statements.

Critical accounting estimates are those estimates that both are important to the portrayal of our financial condition and results of operations and require us to exercise significant judgment. The preparation of financial statements in accordance with U.S. GAAP requires us to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses and the disclosure of material contingent assets and liabilities, including litigation contingencies. These estimates, by necessity, are based on assumptions about numerous factors.

We review the following critical accounting estimates and assumptions quarterly: evaluating the adequacy of reserves for unpaid losses and loss adjustment expenses, life and annuity reinsurance benefit reserves, the reinsurance allowance for doubtful accounts and income tax liabilities, as well as analyzing the recoverability of deferred tax assets, estimating reinsurance premiums written and earned and evaluating the investment portfolio for other-than-temporary declines in estimated fair value. Critical accounting estimates and assumptions for goodwill and intangible assets are reviewed in conjunction with an acquisition and goodwill and indefinite-lived intangible assets are reassessed at least annually for impairment. Actual results may differ materially from the estimates and assumptions used in preparing the consolidated financial statements.

Unpaid Losses and Loss Adjustment Expenses

Our consolidated balance sheet included estimated unpaid losses and loss adjustment expenses of $10.1 billion and reinsurance recoverable on unpaid losses of $2.0 billion at December 31, 2016 compared to $10.3 billion and $2.0 billion, respectively, at December 31, 2015. We do not discount our reserves for losses and loss adjustment expenses to reflect estimated present value, except for reserves assumed in connection with an acquisition, which are recorded at fair value at the acquisition date.

We accrue liabilities for unpaid losses and loss adjustment expenses based upon estimates of the ultimate amounts payable. We maintain reserves for specific claims incurred and reported (case reserves) and reserves for claims incurred but not reported (IBNR reserves).

Reported claims are in various stages of the settlement process, and the corresponding reserves for reported claims are based upon all information available to us. Case reserves consider our estimate of the ultimate cost to settle the claims, including investigation and defense of lawsuits resulting from the claims, and may be subject to adjustment for differences between costs originally estimated and costs subsequently re-estimated or incurred. Claims are settled based upon their merits, and some claims may take years to settle, especially if legal action is involved.

For our insurance operations, we are generally notified of insured losses by our insureds or their brokers. Based on this information, we establish case reserves by estimating the expected ultimate losses from the claim (including any administrative costs associated with settling the claim). Our claims personnel use their knowledge of the specific claim along with internal and external experts, including underwriters, actuaries and legal counsel, to estimate the expected ultimate losses.

For our reinsurance operations, case reserves are generally established based on reports received from ceding companies or their brokers. For excess of loss contracts, we are typically notified of insurance losses on specific contracts and record a case reserve for the estimated expected ultimate losses from the claim. For quota share contracts, we typically receive aggregated claims information and record a case reserve based on that information. As with insurance business, we evaluate this information and estimate the expected ultimate losses.

As of any balance sheet date, all claims have not yet been reported, and some claims may not be reported for many years. As a result, the liability for unpaid losses and loss adjustment expenses includes significant estimates for incurred but not reported claims.

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There is normally a time lag between when a loss event occurs and when it is actually reported to us. The actuarial methods that we use to estimate losses have been designed to address the lag in loss reporting as well as the delay in obtaining information that would allow us to more accurately estimate future payments. There is also often a time lag between cedents establishing case reserves and re-estimating their reserves, and notifying us of the new or revised case reserves. As a result, the reporting lag is more pronounced in our reinsurance contracts than in our insurance contracts due to the reliance on ceding companies to report their claims to us. On reinsurance transactions, the reporting lag will generally be 60 to 90 days after the end of a reporting period, but can be longer in some cases. Based on the experience of our actuaries and management, we select loss development factors and trending techniques to mitigate the difficulties caused by reporting lags. At least annually, we evaluate and update our loss development and trending factor selections using cedent specific and industry data.

U.S. GAAP requires that IBNR reserves be based on the estimated ultimate cost of settling claims, including the effects of inflation and other social and economic factors, using past experience adjusted for current trends and any other factors that would modify past experience. IBNR reserves are generally calculated by subtracting paid losses and case reserves from estimated ultimate losses. IBNR reserves were 67% of total unpaid losses and loss adjustment expenses at December 31, 2016 compared to 65% at December 31, 2015.

Our liabilities for unpaid losses and loss adjustment expenses can generally be categorized into two distinct groups, short-tail business and long-tail business. Short-tail business refers to lines of business, such as property, accident and health, automobile, watercraft and marine hull exposures, for which losses are usually known and paid shortly after the loss actually occurs. Long-tail business describes lines of business for which specific losses may not be known and reported for some period and losses take much longer to emerge. Given the time frame over which long-tail exposures are ultimately settled, there is greater uncertainty and volatility in these lines than in short-tail lines of business. Our long-tail coverages consist of most casualty lines, including professional liability, directors' and officers' liability, products liability, general and excess liability and excess and umbrella exposures, as well as workers' compensation insurance. Some factors that contribute to the uncertainty and volatility of long-tail casualty programs, and thus require a significant degree of judgment in the reserving process, include the inherent uncertainty as to the length of reporting and payment development patterns, the possibility of judicial interpretations or legislative changes, including changes in workers' compensation benefit laws, that might impact future loss experience relative to prior loss experience and the potential lack of comparability of the underlying data used in performing loss reserve analyses. For example, we have exposure to auto casualty claims in the United Kingdom through reinsurance contracts written on the 2014 and prior years of account. In the United Kingdom, the calculation of these outstanding claims is informed by the discount rate used in determining lump sum awards in personal injury cases referenced in the Ogden tables, which is currently at 2.5%. This rate is currently under review by the United Kingdom’s Lord Chancellor and an updated rate is expected to be announced as early as February 2017. A reduction in the Ogden rate would increase the expected claims payments on these exposures. As a result of the impact of a change in the Ogden rate on these loss payments, there is uncertainty around the ultimate value for loss reserves on this business. Management believes its existing reserves for unpaid losses and loss adjustment expenses provide a reasonable provision for adverse development on this business. However, our estimate of the ultimate cost of settling these claims is based on many factors, and could be subject to increase once the full impact of the new rate becomes known.

Our ultimate liability may be greater or less than current reserves. Changes in our estimated ultimate liability for loss reserves generally occur as a result of the emergence of unanticipated loss activity, the completion of specific actuarial or claims studies or changes in internal or external factors. We closely monitor new information on reported claims and use statistical analyses prepared by our actuaries to evaluate the adequacy of our recorded reserves. We are required to exercise considerable judgment when assessing the relative credibility of loss development trends. Our philosophy is to establish loss reserves that are more likely redundant than deficient. This means that we seek to establish loss reserves that will ultimately prove to be adequate. As a result, if new information or trends indicate an increase in frequency or severity of claims in excess of what we initially anticipated, we generally respond quickly and increase loss reserves. If, however, frequency or severity trends are more favorable than initially anticipated, we often wait to reduce our loss reserves until we can evaluate experience in additional periods to confirm the credibility of the trend. In addition, for long-tail lines of business, trends develop over longer periods of time, and as a result, we give credibility to these trends more slowly than for short-tail or less volatile lines of business. As part of our acquisition of insurance operations, to the extent the reserving philosophy of the acquired business is less conservative than our reserving philosophy, the post-acquisition loss reserves will be strengthened until total loss reserves are consistent with our target level of confidence. For example, following the 2013 acquisition of Alterra Capital Holdings Limited (Alterra), management applied its more conservative loss reserving philosophy to reserves on premiums earned after the acquisition to establish loss reserves consistent with our historic levels, which we achieved in 2014.

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Each quarter, our actuaries prepare estimates of the ultimate liability for unpaid losses and loss adjustment expenses based on established actuarial methods. Management reviews these estimates, supplements the actuarial analyses with information provided by claims, underwriting and other operational personnel and determines its best estimate of loss reserves, which is recorded in our consolidated financial statements. Our procedures for determining the adequacy of loss reserves at the end of the year are substantially similar to the procedures applied at the end of each interim period.

Additionally, once a year, generally during the third quarter, we conduct a detailed review of our liability for unpaid losses and loss adjustment expenses for A&E claims. If there is significant development on A&E claims in advance of the annual review, such development is considered by our actuaries and by management as part of our quarterly review process. We consider a detailed annual review appropriate because A&E claims develop slowly, are typically reported and paid many years after the loss event occurs and, historically, have exhibited a high degree of variability.

Any adjustments to reserves resulting from our interim or year-end reviews, including changes in estimates, are recorded as a component of losses and loss adjustment expenses in the period of the change. Reserve changes that increase previous estimates of ultimate claims cost are referred to as unfavorable or adverse development, deficiencies or reserve strengthening. Reserve changes that decrease previous estimates of ultimate claims cost are referred to as favorable development or redundancies.

In establishing our liabilities for unpaid losses and loss adjustment expenses, our actuaries estimate an ultimate loss ratio, by accident year or policy year, for each of our product lines with input from our underwriting and claims associates. For product lines in which loss reserves are established on a policy year basis, we have developed a methodology to convert from policy year to accident year for financial reporting purposes. In estimating an ultimate loss ratio for a particular line of business, our actuaries may use one or more actuarial reserving methods and select from these a single point estimate. To varying degrees, these methods include detailed statistical analysis of past claim reporting, settlement activity, claim frequency and severity, policyholder loss experience, industry loss experience and changes in market conditions, policy forms and exposures. The actuarial methods we use include:

Initial Expected Loss Ratio Method – This method multiplies earned premiums by an expected loss ratio. The expected loss ratio is selected utilizing industry data, our historical data, frequency-severity and rate level forecasts and professional judgment.

Paid Loss Development – This method uses historical loss payment patterns to estimate future loss payment patterns. Our actuaries use the historical loss patterns to develop factors that are applied to current paid loss amounts to calculate expected ultimate losses.

Incurred Loss Development – This method uses historical loss reporting patterns to estimate future loss reporting patterns. Our actuaries use the historical loss patterns to develop factors that are applied to current reported losses to calculate expected ultimate losses.

Bornhuetter-Ferguson Paid Loss Development – This method divides the projection of ultimate losses into the portion that has already been paid and the portion that has yet to be paid. The portion that has yet to be paid is estimated as the product of three amounts: the premium earned for the exposure period, the expected loss ratio and the percentage of ultimate losses that are still unpaid. The expected loss ratio is selected by considering historical loss ratios, adjusted for any known changes in pricing, loss trends, adequacy of case reserves, changes in administrative practices and other relevant factors.

Bornhuetter-Ferguson Incurred Loss Development – This method is identical to the Bornhuetter-Ferguson paid loss development method, except that it uses the percentage of ultimate losses that are still unreported, instead of the percentage of ultimate losses that are still unpaid.

Frequency/Severity – Under this method, expected ultimate losses are equal to the product of the expected ultimate number of claims and the expected ultimate average cost per claim. Our actuaries use historical reporting patterns and severity patterns to develop factors that are applied to the current reported amounts to calculate expected ultimate losses.

Outstanding to IBNR Ratio Method – Under this method, IBNR is based on a detailed review of remaining open claims. This method assumes that the estimated future loss development is indicated by the current level of case reserves.

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Each actuarial method has its own set of assumptions and its own strengths and limitations, with no one method being better than the others in all situations. Our actuaries select the reserving methods that they believe will produce the most reliable estimate for the class of business being evaluated. Greater judgment may be required when we introduce new product lines or when there have been changes in claims handling practices, as the statistical data available may be insufficient. In these instances, we may rely upon assumptions applied to similar lines of business, rely more heavily on industry experience, take into account changes in underwriting guidelines and risk selection or review the impact of changes in claims reserving practices with claims personnel.

For example, in January 2013, we acquired Essentia Insurance Company, a company that underwrites insurance exclusively for Hagerty Insurance Agency and Hagerty Classic Marine Insurance Agency (collectively, Hagerty). Hagerty offers liability and physical damage insurance for classic cars, vintage boats, motorcycles and related automotive collectibles. Because Markel had limited exposure to such risks in the past, we supplemented our limited data and loss experience with third-party data. Working with Hagerty, we were able to obtain loss development triangles for the business Hagerty had underwritten with their previous carriers. Markel now aggregates that data with our own data for use in the pricing of and reserving for the Hagerty portfolio of business.

A key assumption in most actuarial analyses is that past development patterns will repeat themselves in the future, absent a significant change in internal or external factors that influence the ultimate cost of our unpaid losses and loss adjustment expenses. Our estimates reflect implicit and explicit assumptions regarding the potential effects of external factors, including economic and social inflation, judicial decisions, changes in law, general economic conditions and recent trends in these factors. Our actuarial analyses are based on statistical analysis but also consist of reviewing internal factors that are difficult to analyze statistically, including underwriting and claims handling changes. In some of our markets, and where we act as a reinsurer, the timing and amount of information reported about underlying claims are in the control of third parties. This can also affect estimates and require re-estimation as new information becomes available.

As indicated above, we may use one or more actuarial reserving methods, which incorporate numerous underlying judgments and assumptions, to establish our estimate of ultimate loss reserves. While we use our best judgment in establishing our estimate for loss reserves, applying different assumptions and variables could lead to significantly different loss reserve estimates.

Loss frequency and loss severity are two key measures of loss activity that often result in adjustments to actuarial assumptions relative to ultimate loss reserve estimates. Loss frequency measures the number of claims per unit of insured exposure. When the number of newly reported claims is higher than anticipated, generally speaking, loss reserves are increased. Conversely, loss reserves are generally decreased when fewer claims are reported than expected. Loss severity measures the average size of a claim. When the average severity of reported claims is higher than originally estimated, loss reserves are typically increased. When the average claim size is lower than anticipated, loss reserves are typically decreased. For example, in each of the past three years, we experienced redundancies on prior years' loss reserves in our brokerage products liability product line as a result of decreases in loss severity. During 2014, we experienced deficiencies on prior years' loss reserves related to our A&E exposures as a result of increases in loss severity.

Changes in prior years' loss reserves, including the trends and factors that impacted loss reserve development, as well as the likelihood that such trends and factors could result in future loss reserve development, are discussed in further detail under "Results of Operations."

Loss reserves are established at management's best estimate, which is generally higher than the corresponding actuarially calculated point estimate. The actuarial point estimate represents our actuaries' estimate of the most likely amount that will ultimately be paid to settle the loss reserves we have recorded at a particular point in time; however, there is inherent uncertainty in the point estimate as it is the expected value in a range of possible reserve estimates. In some cases, actuarial analyses, which are based on statistical analysis, cannot fully incorporate all of the subjective factors that affect development of losses. In other cases, management's perspective of these more subjective factors may differ from the actuarial perspective. Subjective factors where management's perspective may differ from that of the actuaries include: the credibility and timeliness of claims information received from third parties, economic and social inflation, judicial decisions, changes in law, changes in underwriting or claims handling practices, general economic conditions, the risk of moral hazard and other current and developing trends within the insurance and reinsurance markets, including the effects of competition. As a result, the actuarially calculated point estimates for each of our lines of business represent starting points for management's quarterly review of loss reserves.

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In management's opinion, the actuarially calculated point estimate generally underestimates both the ultimate favorable impact of a hard insurance market and the ultimate adverse impact of a soft insurance market. Therefore, the percentage by which management's best estimate exceeds the actuarial point estimate will generally be higher during a soft market than during a hard market. Additionally, following an acquisition of insurance operations, to the extent the reserving philosophy of the acquired business is less conservative than our reserving philosophy, the percentage by which management's best estimate exceeds the actuarial point estimate will generally be lower until we build total loss reserves that are consistent with our historic level of confidence. Management's best estimate of net reserves for unpaid losses and loss adjustment expenses exceeded the actuarially calculated point estimate by $537.4 million, or 7.2%, at December 31, 2016, compared to $538.7 million, or 7.1%, at December 31, 2015.

The difference between management's best estimate and the actuarially calculated point estimate in both 2016 and 2015 is primarily associated with our long-tail business. Actuarial estimates can underestimate the adverse effects of a soft insurance market because the impact of changes in risk selection and terms and conditions can be difficult to quantify. In addition, the frequency of claims may increase in a recessionary environment. Similarly, the risk an insured will intentionally cause or be indifferent to loss may increase during an economic downturn, and the attention to loss prevention measures may decrease. These subjective factors affect the development of losses and represent instances where management's perspectives may differ from those of our actuaries. As a result, management has attributed less credibility than our actuaries to favorable trends experienced on our long-tail business during softmarket periods and has not incorporated these favorable trends into its best estimate to the same extent as the actuaries.

See note 9 of the notes to consolidated financial statements for further details regarding the historical development of reserves for losses and loss adjustment expenses and changes in methodologies and assumptions used to calculate reserves for unpaid losses and loss adjustment expenses.

Management also considers the range, or variability, of reasonably possible losses determined by our actuaries when establishing its best estimate for loss reserves. The actuarial ranges represent our actuaries' estimate of a likely lowest amount and highest amount that will ultimately be paid to settle the loss reserves we have recorded at a particular point in time. The range determinations are based on estimates and actuarial judgments and are intended to encompass reasonably likely changes in one or more of the factors that were used to determine the point estimates. Using statistical models, our actuaries establish high and low ends of a range of reasonable reserve estimates for each of our operating segments.

The following table summarizes our reserves for net unpaid losses and loss adjustment expenses and the actuarially established high and low ends of a range of reasonable reserve estimates, by segment, at December 31, 2016. As described in note 9 of the notes to consolidated financial statements, unpaid losses and loss adjustment expenses attributable to acquisitions are recorded at fair value as of the acquisition date, which generally consists of the present value of the expected net loss and loss adjustment expense payments plus a risk premium. The net loss reserves presented in this table represent our estimated future payments for losses and loss adjustment expenses, whereas the reserves for unpaid losses and loss adjustment expenses included in the consolidated balance sheet include the unamortized portion of fair value adjustments recorded in conjunction with an acquisition.

(dollars in millions)	Net Loss Reserves Held		Low End of Actuarial     Range(1)		High End of Actuarial    Range(1)
U.S. Insurance	$	3,211.0	$	2,807.6	$	3,461.0
International Insurance	2,047.1		1,569.2		2,303.8
Reinsurance	2,492.1		1,792.4		2,698.0
Other Insurance (Discontinued Lines)	289.6		237.0		450.9

⁽¹⁾  Due to the actuarial methods used to determine the separate ranges for each segment of our business, it is not appropriate to aggregate the high or low ends of the separate ranges to determine the high and low ends of the actuarial range on a consolidated basis.

Undue reliance should not be placed on these ranges of estimates as they are only one of many points of reference used by management to determine its best estimate of ultimate losses. Further, actuarial ranges may not be a true reflection of the potential variability between loss reserves estimated at the balance sheet date and the ultimate cost of settling claims. Actuarial ranges are developed based on known events as of the valuation date, while ultimate losses are subject to events and circumstances that are unknown as of the valuation date.

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We place less reliance on the range established for our Other Insurance (Discontinued Lines) segment than on the ranges established for our other operating segments. The range established for our Other Insurance (Discontinued Lines) segment includes exposures related to acquired lines of business, many of which are no longer being written, that were not subject to our underwriting discipline and controls prior to our acquisition. Additionally, A&E exposures, which are subject to an uncertain and unfavorable legal environment, account for approximately 40% of the net loss reserves considered in the range established for our Other Insurance (Discontinued Lines) segment.

Our exposure to A&E claims results from policies written by acquired insurance operations before their acquisitions. The exposure to A&E claims originated from umbrella, excess and commercial general liability (CGL) insurance policies and assumed reinsurance contracts that were written on an occurrence basis from the 1970s to mid-1980s. Exposure also originated from claims-made policies that were designed to cover environmental risks provided that all other terms and conditions of the policy were met. A&E claims include property damage and clean-up costs related to pollution, as well as personal injury allegedly arising from exposure to hazardous materials. After 1986, we began underwriting CGL coverage with pollution exclusions, and in some lines of business we began using a claims-made form. These changes significantly reduced our exposure to future A&E claims on post-1986 business.

There is significant judgment required in estimating the amount of our potential exposure from A&E claims due to the limited and variable historical data on A&E losses as compared to other types of claims, the potential significant reporting delays of claims from insureds to insurance companies and the continuing evolution of laws and judicial interpretations of those laws relative to A&E exposures. Due to these unique aspects of A&E exposures, the ultimate value of loss reserves for A&E claims cannot be estimated using traditional methods and is subject to greater uncertainty than other types of claims. Other factors contributing to the significant uncertainty in estimating A&E reserves include: uncertainty as to the number and identity of insureds with potential exposure; uncertainty as to the number of claims filed by exposed, but not ill, individuals; uncertainty as to the settlement values to be paid; difficulty in properly allocating responsibility and liability for the loss, especially if the claim involves multiple insurance providers or multiple policy periods; growth in the number and significance of bankruptcies of asbestos defendants; uncertainty as to the financial status of companies that insured or reinsured all or part of A&E claims; and inconsistent court decisions and interpretations with respect to underlying policy intent and coverage.

Due to these uncertainties, it is not possible to estimate our ultimate liability for A&E exposures with the same degree of reliability as with other types of exposures. Future development will be affected by the factors mentioned above and could have a material effect on our results of operations, cash flows and financial position. As of December 31, 2016 and 2015, our consolidated balance sheets included estimated net reserves for A&E losses and loss adjustment expenses of $111.6 million and $132.9 million, respectively.

On March 9, 2015, we completed a retroactive reinsurance transaction to cede a portfolio of policies primarily comprised of liabilities arising from A&E exposures that originated before 1992 to a third party. At the time of the transaction, reserves for unpaid losses and loss adjustment expenses on the policies ceded totaled $94.1 million. The ceded reserves are expected to be formally transferred to the third party in 2017 by way of a Part VII transfer pursuant to the Financial Services and Markets Act 2000 of the United Kingdom. Although we believe our loss reserves for these A&E exposures are adequate, the Part VII transfer will eliminate the uncertainty regarding the potential for adverse development of estimated ultimate liabilities on the underlying policies. On October 30, 2015, we completed a second retroactive reinsurance transaction to cede a portfolio of policies primarily comprised of liabilities arising from A&E exposures that originated before 1987. The transaction provides up to $300 million of coverage for losses in excess of a $97.0 million retention on the ceded policies and 50% coverage on an additional $100 million of losses. After considering our retention on the ceded policies, ceded reserves for unpaid losses and loss adjustment expenses totaled $76.4 million. As of December 31, 2016, our total reinsurance recoverable on unpaid losses for A&E exposures was 66% of our gross reserves for A&E exposures.

We seek to establish appropriate reserve levels for A&E exposures, including A&E exposures ceded to third parties under retroactive reinsurance transactions; however, these reserves could increase in the future. Any future adverse development on reserves subject to retroactive reinsurance contracts will result in increases in our gross reserves for unpaid losses and loss adjustment expenses for A&E exposures and will be recognized in net income in the current period. Any corresponding benefit for ceded losses, however, will be deferred and recognized as claims are settled. These reserves are not discounted to present value and are forecasted to pay out over the next 40 to 50 years as claims are settled.

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Life and Annuity Benefits

We previously acquired a block of life and annuity reinsurance contracts which subject us to mortality, longevity and morbidity risks. The related reserves are compiled by our actuaries on a reinsurance contract-by-contract basis and are computed on a discounted basis using standard actuarial techniques and cash flow models. Since the development of our life and annuity reinsurance reserves is based upon cash flow projection models, we must make estimates and assumptions based on cedent experience, industry mortality tables, and expense and investment experience, including a provision for adverse deviation. The assumptions used to determine policy benefit reserves are generally locked-in for the life of the contract unless an unlocking event occurs. To the extent existing policy reserves, together with the present value of future gross premiums and expected investment income earned thereon, are not adequate to cover the present value of future benefits, settlement and maintenance costs, the locked-in assumptions are revised to current best estimate assumptions and a charge to earnings for life and annuity benefits is recognized at that time. Our consolidated balance sheets at December 31, 2016 and 2015 included reserves for life and annuity benefits of $1.0 billion and $1.1 billion, respectively.

Because of the assumptions and estimates used in establishing reserves for life and annuity benefit obligations and the long-term nature of these reinsurance contracts, the ultimate liability may be greater or less than the estimates. The average discount rate for the life and annuity benefit reserves was 2.3% as of December 31, 2016.

Reinsurance Premiums

Our assumed reinsurance premiums are recorded at the inception of each contract based upon contract terms and information received from cedents and brokers. For excess of loss contracts, the amount of minimum or deposit premium is usually contractually documented at inception, and variances between this premium and final premium are generally small. An adjustment is made to the minimum or deposit premium, when notified, if there are changes in underlying exposures insured. For quota share contracts, gross premiums written are normally estimated at inception based on information provided by cedents or brokers. We generally record such premiums using the cedent's initial estimates, and then adjust them as more current information becomes available, with such adjustments recorded as premiums written in the period they are determined. We believe that the cedent's estimate of the volume of business they expect to cede to us usually represents the best estimate of gross premium written at the beginning of the contract. As the contract progresses, we monitor actual premium received in conjunction with correspondence from the cedent in order to refine our estimate. Variances from original premium estimates are normally greater for quota share contracts than excess of loss contracts. Premiums are earned on a pro rata basis over the coverage period, or for multi-year contracts, in proportion with the underlying risk exposure to the extent there is variability in the exposure throughout the coverage period. The impact of premium adjustments to net income may be mitigated by related acquisition costs and losses.

Certain contracts we write, particularly property catastrophe reinsurance contracts, provide for reinstatements of coverage. Reinstatement premiums are the premiums for the restoration of the reinsurance limit of a contract to its full amount after a loss occurrence by the reinsured. The purpose of optional and required reinstatements is to permit the reinsured to reinstate the reinsurance coverage at a pre-determined price level once a loss event has penetrated the reinsurance layer. In addition, required reinstatement premiums permit the reinsurer to obtain additional premiums to cover the additional loss limits provided.

We accrue for reinstatement premiums resulting from losses recorded. Such accruals are based upon contractual terms and the only element of management judgment involved is with respect to the amount of losses recorded. Changes in estimates of losses recorded on contracts with reinstatement premium features will result in changes in reinstatement premiums based on contractual terms. Reinstatement premiums are recognized at the time we record losses and are earned on a pro-rata basis over the coverage period.

Ceded Reinsurance Allowance for Doubtful Accounts

We evaluate and adjust reserves for uncollectible ceded reinsurance based upon our collection experience, the financial condition of our reinsurers, collateral held and the development of our gross loss reserves. Our consolidated balance sheets at December 31, 2016 and 2015 included a reinsurance allowance for doubtful accounts of $36.8 million and $59.4 million, respectively. The decrease in the reinsurance allowance for doubtful accounts in 2016 was due to a reduction in the allowance for reserves that were ceded to a third party, a decrease in the estimate of uncollectible reinsurance recoverables as of December 31, 2016 and write-offs of uncollectible balances.

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Reinsurance recoverables recorded on insurance losses ceded under reinsurance contracts are subject to judgments and uncertainties similar to those involved in estimating gross loss reserves. In addition to these uncertainties, our reinsurance recoverables may prove uncollectible if the reinsurers are unable or unwilling to perform under the reinsurance contracts. In establishing our reinsurance allowance for amounts deemed uncollectible, we evaluate the financial condition of our reinsurers and monitor concentration of credit risk arising from our exposure to individual reinsurers. To determine if an allowance is necessary, we consider, among other factors, published financial information, reports from rating agencies, payment history, collateral held and our legal right to offset balances recoverable against balances we may owe. Our ceded reinsurance allowance for doubtful accounts is subject to uncertainty and volatility due to the time lag involved in collecting amounts recoverable from reinsurers. Over the period of time that losses occur, reinsurers are billed and amounts are ultimately collected, economic conditions, as well as the operational and financial performance of particular reinsurers, may change and these changes may affect the reinsurers' willingness and ability to meet their contractual obligation to us. It is also difficult to fully evaluate the impact of major catastrophic events on the financial stability of reinsurers, as well as the access to capital that reinsurers may have when such events occur. The ceding of insurance does not legally discharge us from our primary liability for the full amount of the policies, and we will be required to pay the loss and bear collection risk if the reinsurers fail to meet their obligations under the reinsurance contracts.

Income Taxes and Uncertain Tax Positions

The preparation of our consolidated income tax provision, including the evaluation of tax positions we have taken or expect to take on our income tax returns, requires significant judgment. In evaluating our tax positions, we recognize the tax benefit from an uncertain tax position only if, based on the technical merits of the position, it is more likely than not that the tax position will be sustained upon examination by the taxing authorities. Tax positions that meet the more likely than not threshold are then measured using a probability weighted approach, whereby the largest amount of tax benefit that is greater than 50% likely of being realized upon ultimate settlement is recognized. At December 31, 2016, we had unrecognized tax benefits of $8.9 million related to uncertain tax positions. The tax positions that we have taken or expect to take are based upon the application of tax laws and regulations, which are subject to interpretation, judgment and uncertainty. As a result, our actual liability for income taxes may differ significantly from our estimates.

We record deferred income taxes as assets or liabilities on our consolidated balance sheets to reflect the net tax effect of the temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and their respective tax bases. At December 31, 2016 and 2015, our net deferred tax liability was $330.5 million and $176.2 million, respectively. The increase in our net deferred tax liability in 2016 was primarily driven by increases in the deferred tax liabilities related to accumulated other comprehensive income, resulting from an increase in net unrealized gains on investments in 2016, and deferred policy acquisition costs.

Deferred tax assets are reduced by a valuation allowance when management believes it is more likely than not that some, or all, of the deferred tax assets will not be realized. As of December 31, 2016 and 2015, our deferred tax assets were net of a valuation allowance of $18.8 million and $5.1 million, respectively. In evaluating our ability to realize our deferred tax assets and assessing the need for a valuation allowance at December 31, 2016 and 2015, we made estimates regarding the future taxable income of our subsidiaries and judgments about our ability to pursue prudent and feasible tax planning strategies. A change in any of these estimates and judgments could result in the need to increase our valuation allowance through a charge to earnings. See note 8 of the notes to consolidated financial statements for further discussion of our consolidated income tax provision, uncertain tax positions and net operating losses.

Goodwill and Intangible Assets

Our consolidated balance sheet as of December 31, 2016 included goodwill and intangible assets of approximately $1.9 billion. Goodwill and intangible assets are recorded as a result of business acquisitions. Goodwill represents the excess of the amount paid to acquire a business over the net fair value of assets acquired and liabilities assumed at the date of acquisition. Indefinite-lived and other intangible assets are recorded at fair value as of the acquisition date. The determination of the fair value of certain assets acquired and liabilities assumed involves significant judgment and the use of valuation models and other estimates, which require assumptions that are inherently subjective. Goodwill and indefinite-lived intangible assets are tested for impairment at least annually. Intangible assets with definite lives are reviewed for impairment when events or circumstances indicate that their carrying value may not be recoverable. We completed our annual test for impairment during the fourth quarter of 2016 based upon results of operations through September 30, 2016.

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For some reporting units, we assessed qualitative factors (commonly referred to as "Step 0") to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. This assessment serves as a basis for determining whether it is necessary to perform the two-step goodwill impairment test. For other reporting units, we elected to bypass Step 0 and perform Step 1 of the goodwill impairment test, which includes determining whether the carrying amount of a reporting unit, including goodwill, exceeds its estimated fair value. If the carrying amount exceeds its fair value, then Step 2 of the goodwill impairment test is performed by estimating the fair value of individual assets (including identifiable intangible assets) and liabilities of the reporting unit. The excess of the estimated fair value of the reporting unit over the estimated fair value of net assets would establish the implied value of goodwill. The excess of the recorded amount of goodwill over the implied value is charged to net income as an impairment loss.

A significant amount of judgment is required in performing goodwill impairment tests. When using the qualitative approach, we considered macroeconomic factors such as industry and market conditions. We also considered reporting unit-specific events, actual financial performance versus expectations and management's future business expectations. As part of our Step 0 evaluation of certain reporting units with material goodwill, we considered the fact that some of the businesses had been recently acquired in orderly transactions between market participants, and our purchase price represented fair value at acquisition. There were no events since acquisition which had a significant impact on the fair value of these reporting units. For reporting units which we tested quantitatively, we estimated fair value primarily using an income approach based on a discounted cash flow model. The cash flow projections used in the discounted cash flow model included management's best estimate of future growth and margins. The discount rates used to determine the fair value estimates were developed based on the capital asset pricing model using market-based inputs as well as an assessment of the inherent risk in projected future cash flows.

With the exception of one of our Markel Ventures industrial manufacturing reporting units, we believe the fair value of each of our reporting units exceeded its respective carrying amount as of October 1, 2016 and December 31, 2016. Additionally, we do not believe we are at risk of failing Step 1 at any of our reporting units with the result being a material impairment of goodwill.

During the fourth quarter of 2016, we recorded a goodwill impairment charge of $18.7 million to other expenses for one of our Markel Ventures industrial manufacturing reporting units, to reduce the carrying value of its goodwill to its implied fair value. Unfavorable market conditions, specifically declining oil prices from late 2014 through 2016, resulted in lower than expected earnings over a similar time period. The reporting unit's earnings are generally tied to infrastructure spending across global markets, a significant portion of which are influenced by the price of oil. To determine the value of the impairment loss, we estimated the fair value of the reporting unit primarily using an income approach based on a discounted cash flow model that incorporates management's best estimate of future growth and margins. While these cash flow projections yield positive cash flows and earnings in the long-term, they were insufficient to support the current carrying value of the reporting unit due to the unfavorable impact of current market conditions and recent trends on our shorter-term projections. After recording this charge in 2016, the reporting unit's goodwill was reduced to zero.

During the fourth quarters of 2015 and 2014, we recorded goodwill impairment charges of $14.9 million and $13.7 million, respectively, to other expenses, for one of our Markel Ventures healthcare reporting units, to reduce the carrying value of its goodwill to its implied fair value. The reporting unit's operations consist of the planning, development and operation of behavioral health services in partnership with healthcare organizations. In both periods, we determined the goodwill for the reporting unit was impaired as a result of lower than expected earnings and lower estimated future earnings. We believe the performance of this reporting unit has been impacted by healthcare legislation, evolving general healthcare market conditions and the need to adapt more quickly to those changes. Additionally, the reporting unit's performance has been impacted by operational costs in excess of projections on new operating facilities where construction began just prior to our acquisition. Although we anticipated a ramp-up period in the initial operations of these facilities, costs have continued to exceed both our initial and revised expectations. To determine the value of the impairment losses, we estimated the fair value of the reporting unit primarily using an income approach based on a discounted cash flow model that incorporates management's best estimate of future growth and margins. After recording this charge in 2015, the reporting unit's goodwill was reduced to zero.

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Investments

We complete a detailed analysis each quarter to assess whether the decline in the fair value of any investment below its cost basis is deemed other-than-temporary. All securities with unrealized losses are reviewed. For equity securities, a decline in fair value that is considered to be other-than-temporary is recognized in net income based on the fair value of the security at the time of assessment, resulting in a new cost basis for the security. For fixed maturities where we intend to sell the security or it is more likely than not that we will be required to sell the security before recovery of its amortized cost, a decline in fair value is considered to be other-than-temporary and is recognized in net income based on the fair value of the security at the time of assessment, resulting in a new cost basis for the security. If the decline in fair value of a fixed maturity below its amortized cost is considered to be other-than-temporary based upon other considerations, we compare the estimated present value of the cash flows expected to be collected to the amortized cost of the security. The extent to which the estimated present value of the cash flows expected to be collected is less than the amortized cost of the security represents the credit-related portion of the other-than-temporary impairment, which is recognized in net income, resulting in a new cost basis for the security. Any remaining decline in fair value represents the non-credit portion of the other-than-temporary impairment, which is recognized in other comprehensive income (loss). The discount rate used to calculate the estimated present value of the cash flows expected to be collected is the effective interest rate implicit for the security at the date of purchase.

We consider many factors in completing our quarterly review of securities with unrealized losses for other-than-temporary impairment, including the length of time and the extent to which fair value has been below cost and the financial condition and near-term prospects of the issuer. For equity securities, the ability and intent to hold the security for a period of time sufficient to allow for any anticipated recovery is considered. For fixed maturities, we consider whether we intend to sell the security or if it is more likely than not that we will be required to sell the security before recovery, the implied yield-to-maturity, the credit quality of the issuer and the ability to recover all amounts outstanding when contractually due. When assessing whether we intend to sell a fixed maturity or if it is likely that we will be required to sell a fixed maturity before recovery of its amortized cost, we evaluate facts and circumstances including, but not limited to, decisions to reposition the investment portfolio, potential sales of investments to meet cash flow needs and potential sales of investments to capitalize on favorable pricing.

Risks and uncertainties are inherent in our other-than-temporary decline in fair value assessment methodology. The risks and uncertainties include, but are not limited to, incorrect or overly optimistic assumptions about the financial condition, liquidity or near-term prospects of an issuer, inadequacy of any underlying collateral, unfavorable changes in economic or social conditions and unfavorable changes in interest rates or credit ratings. Changes in any of these assumptions could result in charges to earnings in future periods.

Losses from write downs for other-than-temporary declines in the estimated fair value of investments, while potentially significant to net income, do not have an impact on our financial position. Since our investment securities are considered available-for-sale and are recorded at estimated fair value, unrealized losses on investments are already included in accumulated other comprehensive income. See note 3(b) of the notes to consolidated financial statements for further discussion of our assessment methodology for other-than-temporary declines in the estimated fair value of investments.

Recent Accounting Pronouncements

The Financial Accounting Standards Board has recently issued several accounting standards updates (ASUs) that have the potential to impact our consolidated financial position, results of operations or cash flows upon adoption. The standards that we expect have the most potential to significantly impact us in future periods are as follows:

• ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606)

• ASU No. 2016-01, Financial Instruments (Topic 825): Recognition and Measurement of Financial Assets and Financial Liabilities

• ASU No. 2016-02, Leases (Topic 842)

• ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments

See note 1(u) of the notes to consolidated financial statements for discussion of these ASUs and the expected effects on our consolidated financial position, results of operations and cash flows.

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Key Performance Indicators

We measure financial success by our ability to grow book value per share at a high rate of return over a long period of time. To mitigate the effects of short-term volatility, we measure ourselves over a five-year period. We believe that growth in book value per share is the most comprehensive measure of our success because it includes all underwriting, operating and investing results. We measure underwriting results by our underwriting profit or loss and combined ratio. We measure investing results by our net investment income and net realized gains (losses) as well as our taxable equivalent total investment return. We measure our other operating results, which primarily consist of our Markel Ventures operations, by our revenues and net income (loss), as well as earnings before interest, income taxes, depreciation and amortization (EBITDA). These measures are discussed in greater detail under "Results of Operations."

Results of Operations

The following table presents the components of net income to shareholders.

	Years Ended December 31,
(dollars in thousands)	2016			2015			2014
U.S. Insurance segment underwriting profit	$	152,745		$	238,168		$	99,318
International Insurance segment underwriting profit	47,205			125,701			67,316
Reinsurance segment underwriting profit	106,835			86,280			38,900
Other Insurance (Discontinued Lines) segment underwriting profit (loss)	9,751			(20,442		)	(27,971		)
Net investment income	373,230			353,213			363,230
Net realized investment gains	65,147			106,480			46,000
Other revenues	1,307,779			1,086,758			883,525
Other expenses	(1,190,243		)	(1,046,805		)	(854,871		)
Amortization of intangible assets	(68,533		)	(68,947		)	(57,627		)
Interest expense	(129,896		)	(118,301		)	(117,442		)
Loss on early extinguishment of debt	(44,100		)	—			—
Income tax expense	(169,477		)	(152,963		)	(116,690		)
Net income attributable to noncontrolling interests	(4,754		)	(6,370		)	(2,506		)
Net income to shareholders	$	455,689		$	582,772		$	321,182

Net income to shareholders decreased 22% from 2015 to 2016 due to less favorable underwriting results, a loss on early extinguishment of debt and lower net realized investment gains, partially offset by more favorable results within our non-insurance operations compared to 2015. Net income to shareholders increased 81% from 2014 to 2015 due to more favorable underwriting results and higher net realized investment gains, partially offset by higher income tax expense compared to 2014. The components of net income to shareholders are discussed in further detail under "Underwriting Results," "Life and Annuity Benefits," "Investing Results," "Markel Ventures Operations" and "Interest Expense, Loss on Early Extinguishment of Debt and Income Taxes."

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Underwriting Results

Underwriting profits are a key component of our strategy to grow book value per share. We believe that the ability to achieve consistent underwriting profits demonstrates knowledge and expertise, commitment to superior customer service and the ability to manage insurance risk. The property and casualty insurance industry commonly defines underwriting profit or loss as earned premiums net of losses and loss adjustment expenses and underwriting, acquisition and insurance expenses. We use underwriting profit or loss as a basis for evaluating our underwriting performance. The combined ratio is a measure of underwriting performance and represents the relationship of incurred losses, loss adjustment expenses and underwriting, acquisition and insurance expenses to earned premiums. The combined ratio is the sum of the loss ratio and the expense ratio. A combined ratio less than 100% indicates an underwriting profit, while a combined ratio greater than 100% reflects an underwriting loss. The loss ratio represents the relationship of incurred losses and loss adjustment expenses to earned premiums. The expense ratio represents the relationship of underwriting, acquisition and insurance expenses to earned premiums.

The following table presents selected data from our underwriting operations.

	Years Ended December 31,
(dollars in thousands)	2016				2015				2014
Gross premium volume	$	4,796,645			$	4,632,912			$	4,805,513
Net written premiums	$	4,001,020			$	3,819,293			$	3,917,015
Net retention	83		%		82		%		82		%
Earned premiums	$	3,865,870			$	3,823,532			$	3,840,912
Losses and loss adjustment expenses	$	2,050,744			$	1,938,745			$	2,202,467
Underwriting, acquisition and insurance expenses	$	1,498,590			$	1,455,080			$	1,460,882
Underwriting profit	$	316,536			$	429,707			$	177,563
U.S. GAAP Combined Ratios
U.S. Insurance	93		%		89		%		95		%
International Insurance	94		%		86		%		93		%
Reinsurance	87		%		90		%		96		%
Other Insurance (Discontinued Lines)	NM			(1)	NM			(1)	NM			(1)
Markel Corporation (Consolidated)	92		%		89		%		95		%

⁽¹⁾  NM—Ratio is not meaningful. Further discussion of Other Insurance (Discontinued Lines) underwriting profit (loss) follows.

The increase in the consolidated combined ratio from 2015 to 2016 was driven by less favorable development on prior years' loss reserves in 2016 compared to 2015. The 2016 consolidated current accident year loss ratio included $22.1 million of underwriting loss related to Canadian wildfires and $46.6 million of underwriting loss related to Hurricane Matthew. Together, these losses represented two points on the consolidated combined ratio. The impact of these losses on the 2016 consolidated current accident year loss ratio was more than offset by a decrease in management's best estimate of ultimate loss ratios on various product lines in 2016, due in part to lower attritional losses in all three of our ongoing underwriting segments. Additionally, following the completion of two retroactive reinsurance transactions in 2015, we have less variability in our consolidated loss reserves. Management also continues to gain confidence in the actuarial projections on product lines previously written by Alterra, which we acquired in 2013. As a result, management's best estimate of the ultimate loss ratios on various product lines across all three of our ongoing underwriting segments decreased compared to 2015. We continue to maintain a consolidated confidence level in a range consistent with our historic levels.

The decrease in the consolidated combined ratio from 2014 to 2015 was driven by more favorable development on prior years' loss reserves in each of our underwriting segments in 2015 compared to 2014, as well as a lower current accident year loss ratio in 2015 compared to 2014. The decrease in the current accident year loss ratio in 2015 was due in part to lower attritional losses across several product lines in our Reinsurance segment in 2015 compared to 2014.

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The 2016 combined ratio included $505.2 million of favorable development on prior years' loss reserves compared to $627.8 million in 2015 and $435.5 million in 2014. The decrease in prior year redundancies in 2016 compared to 2015 was due in part to $71.2 million, or two points on the consolidated combined ratio, of adverse development in our U.S. Insurance segment on our medical malpractice and specified medical product lines. Redundancies on prior years' loss reserves in 2015 included $82.7 million, or two points on the 2015 consolidated combined ratio, of favorable development attributable to a decrease in the estimated volatility of our consolidated net reserves for unpaid losses and loss adjustment expenses, as a result of ceding a significant portion of our A&E exposures to a third party. As a result of this decrease in estimated volatility, our level of confidence in our net reserves for unpaid losses and loss adjustment expenses increased. Therefore, management reduced prior years' loss reserves in order to maintain a consolidated confidence level in a range consistent with our historic levels. This reduction in prior years' loss reserves occurred across all three of our ongoing underwriting segments. The decrease in prior year redundancies in 2016 was also attributable to less favorable development on prior years' loss reserves in our International Insurance segment.

The increase in prior year redundancies in 2015 compared to 2014 was due in part to the decrease in the estimated volatility of our consolidated net reserves for unpaid losses and loss adjustment expenses, as a result of ceding a significant portion of our A&E exposures to a third party. We also experienced more favorable development in 2015 compared to 2014 as management had more confidence in the actuarial projections for product lines previously written by Alterra during 2015 compared to 2014. Following the 2013 acquisition of Alterra, management applied its more conservative loss reserving philosophy to reserves on premiums earned after the acquisition to establish loss reserves consistent with our historic levels, which we achieved in 2014.

The favorable development on prior years' loss reserves during all three years was primarily due to loss reserve redundancies on our long-tail casualty lines within our U.S. Insurance and International Insurance segments and our marine and energy lines within the International Insurance segment. Over the past three years, we have experienced significant redundancies on prior years' loss reserves despite the soft market conditions we have operated in since 2005. The favorable trend in prior years' loss reserves is due in part to the adverse impact of the soft market not being as significant as originally anticipated. Given the volatile nature of our long-tail books of business, the ultimate impact of the soft market could not be quantified when we initially established loss reserves for these years. In each of the past three years, actual claims development patterns have been more favorable than we initially anticipated. As the average loss severity or claim frequency estimates on these long-tail books of business have decreased, our actuarial estimates of the ultimate liability for unpaid losses and loss adjustment expenses were reduced, and management reduced prior years' loss reserves accordingly.

In connection with our quarterly reviews of loss reserves, the actuarial methods we used have exhibited a favorable trend for the 2012 to 2015 accident years during 2016. This trend was observed using statistical analysis of actual loss experience for those years, particularly with regard to most of our long-tail books of business within the U.S. Insurance and International Insurance segments, which developed more favorably than we had expected based upon our historical experience. As actual losses experienced on these accident years have continued to be lower than anticipated, it has become more likely that the underwriting results will prove to be better than originally estimated. Additionally, as most actuarial methods rely upon historical reporting patterns, the favorable trends experienced on earlier accident years have resulted in a re-estimation of our ultimate incurred losses on more recent accident years. When we experience loss frequency or loss severity trends that are more favorable than we initially anticipated, we often evaluate the loss experience over a period of several years in order to assess the relative credibility of loss development trends. In each of the past three years, based upon our evaluations of claims development patterns in our long-tail, and often volatile, lines of business, we gave greater credibility to the favorable trend. As a result, our actuaries reduced their estimates of ultimate losses, and management incorporated this favorable trend into its best estimate and reduced prior years' loss reserves accordingly.

While we believe it is possible that there will be additional redundancies on prior years' loss reserves in 2017, we caution readers not to place undue reliance on this favorable trend. Despite stabilization of prices on certain product lines during the last three years, we still consider the overall property and casualty insurance market to be soft. The impact on our underwriting results from the soft insurance market cannot be fully quantified in advance.

The following discussion provides more detail by segment of the underwriting results described above. Following this segment-based discussion is a summary table of prior years' loss reserve development.

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U.S. Insurance Segment

The combined ratio for the U.S. Insurance segment for 2016 was 93% compared to 89% in 2015 and 95% in 2014. The increase in the 2016 combined ratio was due to less favorable development of prior years' loss reserves. The current accident year loss ratio was flat compared to 2015. The current accident year loss ratio included $18.4 million, or one point on the segment combined ratio, of underwriting loss related to Hurricane Matthew. We also experienced higher attritional losses on certain product lines in 2016 compared to 2015, primarily our medical malpractice and specified medical lines. These losses were offset by lower attritional losses on other product lines, primarily our general liability lines, and a favorable impact resulting from a decrease in management's best estimate of ultimate loss ratios on various product lines, as previously discussed.

The decrease in the 2015 combined ratio was due to more favorable development of prior years' loss reserves and a lower expense ratio compared to 2014. The improvement in the U.S. Insurance segment's expense ratio in 2015 was primarily due to higher earned premiums and lower general expenses in 2015 compared to 2014.

The U.S. Insurance segment's 2016 combined ratio included $204.9 million of favorable development on prior years' loss reserves compared to $299.0 million in 2015 and $216.6 million in 2014. The decrease in prior year redundancies in 2016 was driven by adverse development on our medical malpractice and specified medical product lines in 2016, which totaled $71.2 million or three points on the segment combined ratio, and less favorable development on our property product lines in 2016 compared to 2015. Additionally, redundancies on prior years' loss reserves in 2015 included $35.2 million, or two points on the segment combined ratio, attributable to the decrease in the volatility of our consolidated net reserves for unpaid losses and loss adjustment expenses, as previously discussed. The increase in prior year redundancies in 2015 was due in part to this decrease in reserve volatility, as well as favorable development on prior years' loss reserves in our Global Insurance division in 2015, primarily on our inland marine product line, compared to adverse development in 2014.

The following is a discussion of the product lines with the most significant development on prior years' loss reserves in the U.S. Insurance segment during the last three years.

In 2016, we experienced $104.0 million of redundancies on various long-tail general and excess liability lines. The redundancies occurred across several accident years, but were most significant on the 2013 to 2015 accident years. In 2015, we experienced $111.3 million of redundancies on various long-tail general and excess liability lines, primarily on the 2011 to 2014 accident years. In 2014, we experienced $93.4 million of redundancies on various long-tail general and excess liability lines, primarily on the 2007 to 2012 accident years. In all three periods, the redundancies were due in part to lower loss severity than originally anticipated. Our binding and brokerage casualty business includes product lines that are long-tail and volatile in nature. During 2016, 2015 and 2014, actual incurred losses and loss adjustment expenses on prior accident years for reported claims on certain long-tail casualty lines were $51.8 million, $40.0 million and $62.9 million, respectively, less than we anticipated in our actuarial analyses. As a result, our actuaries reduced their estimates of ultimate losses in 2016, 2015 and 2014, and management assigned greater credibility to this favorable experience and reduced prior years' loss reserves accordingly.

The favorable development on prior years' loss reserves in the U.S. Insurance segment in 2016, 2015 and 2014 also included $41.1 million, $36.6 million and $25.7 million, respectively, of redundancies at our workers' compensation unit. In 2016, the redundancies in our workers' compensation unit were most significant on the 2012 to 2015 accident years. In 2015, the redundancies in our workers' compensation unit were most significant on the 2011 to 2014 accident years. In 2014, the redundancies were most significant on the 2012 and 2013 accident years. When we acquired this business in 2010, we supplemented our limited data with longer-tailed industry development factors and adopted a more conservative loss reserving position until we had sufficient data to determine how the loss reserves develop. During 2014 and 2015, our actuaries gave more weight to our own data and placed less reliance on industry data as part of the reserving for this product line. As a result, our actuaries reduced their estimates of ultimate losses in those years. Management assigned greater credibility to this favorable experience and reduced prior years' loss reserves accordingly. During 2016, actual incurred losses and loss adjustment expenses on prior accident years for reported claims was $24.9 million less than we anticipated in our actuarial analysis, due in part to lower loss severity than originally anticipated. As a result, our actuaries reduced their estimates of ultimate losses in 2016 and management assigned greater credibility to this favorable experience and reduced prior years' loss reserves accordingly.

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In 2016 and 2014, we also experienced redundancies in certain of our professional liability product lines. In 2016, favorable development on our professional liability product lines was more than offset by adverse development of $71.2 million on our medical malpractice and specified medical product lines, primarily on the 2010 through 2015 accident years. The adverse development on both of these product lines was driven by an increase in the proportion of business written on classes with higher claim frequencies relative to other classes of business within these product lines over the last several years, including correctional facilities, locum tenens and contract staffing. Beginning in late 2015, we saw an increase in claim frequencies on these classes, which was inconsistent with the historical trends indicated by our actuarial analyses. In 2016, we continued to see steady increases in claim frequencies, as well as increases in claims payments on these classes of business. As a result, we gave more credibility to this new trend and management increased loss reserves accordingly. In response, we have taken corrective actions for business written in the affected classes. Excluding the adverse development on our medical malpractice and specified medical product lines, we experienced $38.0 million of redundancies on our other professional liability programs during 2016, primarily on the 2014 and 2015 accident years. The favorable development occurred across multiple professional liability lines and was driven by a combination of factors, including lower loss severity than was originally anticipated and a decrease in the frequency of claims and large losses. As a result of these factors, our actuarial estimates of the ultimate liability for unpaid losses and loss adjustment expenses were reduced, and management reduced prior years' loss reserves accordingly.

In 2014, favorable development on our professional liability product lines was partially offset by adverse development of $20.2 million on our architects and engineers product line, primarily on the 2008 through 2013 accident years. The adverse development on this product line was driven by an increase in the frequency of high severity claims. Based on this experience, our actuaries increased their estimates of ultimate losses and management increased prior years' loss reserves accordingly. We took significant corrective actions on our architects and engineers product line during 2014, including exiting certain classes and states and re-underwriting and re-pricing the ongoing business. Excluding the adverse development on our architects and engineers product line, the favorable development of prior years' loss reserves during 2014 included $48.4 million of redundancies on our professional liability programs, primarily on the 2013 accident year. In 2014, the product line that produced the majority of the redundancy was specified medical, driven by lower loss severity than was originally anticipated. As a result of the decreases in severity, our actuarial estimates of the ultimate liability for unpaid losses and loss adjustment expenses were reduced, and management reduced prior years' loss reserves accordingly.

In 2016, we experienced favorable development on prior years' loss reserves on our property product lines, primarily our inland marine and brokerage property lines. Favorable development on our inland marine business totaled $20.1 million in 2016, primarily on the 2014 and 2015 accident years. Favorable development totaled $27.5 million in 2015, primarily on the 2013 and 2014 accident years. In both years, the favorable development was attributable to lower than expected frequency of large loss events. Favorable development on our brokerage property product lines totaled $17.9 million in 2016 and was due to lower than expected losses and development on known claims, primarily on the 2012 to 2014 accident years. In 2015, favorable development totaled $35.0 million and was due to lower than expected frequency of large loss events, primarily on the 2013 and 2014 accident years. As a result of these factors, our actuarial estimates of the ultimate liability for unpaid losses and loss adjustment expenses decreased, and management reduced prior years' loss reserves accordingly.

International Insurance Segment

The combined ratio for the International Insurance segment was 94% for 2016 compared to 86% for 2015 and 93% for 2014. The increase in the 2016 combined ratio was driven by less favorable development of prior years' loss reserves and a higher expense ratio, partially offset by a lower current accident year ratio in 2016 compared to 2015. The 2016 current accident year loss ratio included $12.0 million, or one point on the segment combined ratio, of underwriting loss related to Hurricane Matthew. We also experienced higher attritional and large losses on our marine and energy product lines in 2016. The impact of these losses on the 2016 current accident year loss ratio was more than offset by lower attritional losses in our general liability product lines in 2016 compared to 2015 and a decrease in management's best estimate of ultimate loss ratios on various product lines in 2016, as previously discussed. The increase in the 2016 expense ratio was attributable to higher broker commissions in 2016 compared to 2015 and the write off of previously capitalized software development costs in 2016. These increases were partially offset by lower profit sharing costs in 2016 compared to 2015.

The decrease in the 2015 combined ratio was driven by more favorable development of prior years' loss reserves, partially offset by a higher expense ratio in 2015 compared to 2014. The increase in the 2015 expense ratio was due to higher profit sharing costs, higher general expenses and lower earned premiums in 2015 compared to 2014.

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The International Insurance segment's 2016 combined ratio included $164.7 million of favorable development on prior years' loss reserves compared to $248.8 million of favorable development in 2015 and $166.6 million in 2014. The decrease in loss reserve redundancies in 2016 compared to 2015 was driven by less favorable development on our marine and energy and general liability product lines. Additionally, redundancies on prior years' loss reserves in 2015 included $32.3 million, or four points on the segment combined ratio, attributable to the decrease in volatility of our consolidated net reserves for unpaid losses and loss adjustment expenses, as previously discussed. In both 2015 and 2016, favorable development on prior years' loss reserves occurred across several product lines, but was most significant on our marine and energy, general liability and professional liability product lines. In 2014, the redundancies on prior years loss reserves were most significant on our professional liability and marine and energy product lines. In all three years, the redundancies were driven by lower than expected claims activity on prior accident years and favorable claims settlements. Redundancies on prior years' loss reserves in 2016 included $66.6 million of favorable development on our professional liability product lines, compared to $39.7 million in 2015 and $62.7 million in 2014. Favorable development on our marine and energy product lines totaled $39.6 million in 2016, $64.8 million in 2015, and $45.9 million in 2014. Favorable development on our general liability product lines totaled $23.1 million in 2016 and $60.9 million in 2015. In 2016, the redundancies on prior year loss reserves in the International Insurance segment were most significant on the 2013 and 2014 accident years. In 2015, the redundancies on prior years' loss reserves were most significant on the 2012 to 2014 accident years. In 2014, the redundancies on prior years' loss reserves were most significant on the 2010 to 2012 accident years.

Reinsurance Segment

The combined ratio for the Reinsurance segment was 87% for 2016 compared to 90% for 2015 and 96% for 2014. The decrease in the combined ratio in 2016 was driven by more favorable development on prior years' loss reserves and a lower current accident year loss ratio, partially offset by a higher expense ratio in 2016 compared to 2015. The 2016 current accident year loss ratio included $18.7 million, or two points on the segment combined ratio, of underwriting loss related to the Canadian wildfires and $16.2 million, or two points on the segment combined ratio, of underwriting loss related to Hurricane Matthew. The impact of these losses on the 2016 current accident year loss ratio was more than offset by lower attritional losses and a decrease in management's best estimate of ultimate loss ratios on various product lines, as previously discussed. The increase in the expense ratio was primarily due to higher profit sharing expenses and broker commissions in 2016 compared to 2015.

The decrease in the 2015 combined ratio was due to a lower current accident year loss ratio and more favorable development on prior years' loss reserves. The decrease in the current accident year loss ratio in 2015 was driven by lower attritional losses across several product lines in 2015 compared to 2014.

The Reinsurance segment's 2016 combined ratio included $125.5 million of favorable development on prior years' loss reserves compared to $97.9 million in 2015 and $80.0 million in 2014. The increase in loss reserve redundancies in 2016 compared to 2015 was driven by more favorable development on our property product lines. Redundancies on prior years' loss reserves in 2015 included $15.2 million, or two points on the segment combined ratio, attributable to the decrease in volatility of our consolidated net reserves for unpaid losses and loss adjustment expenses, as previously discussed. In 2016, favorable development on prior years' loss reserves was most significant on our property product lines, with the remaining redundancies occurring across several product lines. In 2015, favorable development on prior years' loss reserves was most significant on our casualty and property product lines. In 2014, the redundancies were most significant on our property product lines.

The redundancies on prior years' loss reserves on our property lines of business in 2016, 2015 and 2014 were $67.6 million, $21.1 million and $44.7 million, respectively. In 2016, the favorable development on prior years' loss reserves on these lines was most significant on the 2013 to 2015 accident years. In 2015, the favorable development on prior years' loss reserves was most significant on the 2012 to 2014 accident years. In 2014, the favorable development on prior years' loss reserves was most significant on the 2012 and 2013 accident years. In all three years, the favorable development on prior years' loss reserves was due in part to lower than expected development on reported events, favorable claims settlements and lower than expected claims activity. As a result of these factors, our actuaries reduced their estimates of ultimate losses, and management reduced prior years' loss reserves accordingly. Favorable development on our casualty lines in 2015 totaled $27.4 million, and was primarily attributable to our general casualty and professional liability business. During 2015, management gained more confidence in the actuarial projections on these product lines and reduced prior years' loss reserves accordingly.

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Other Insurance (Discontinued Lines) Segment

The majority of the losses and loss adjustment expenses and the underwriting, acquisition and insurance expenses for the Other Insurance (Discontinued Lines) segment are associated with A&E exposures or other acquired lines of business that were discontinued in conjunction with the acquisition. Given the insignificant amount of premium earned in the Other Insurance (Discontinued Lines) segment, we evaluate this segment's underwriting performance in terms of dollars of underwriting profit or loss instead of its combined ratio.

The Other Insurance (Discontinued Lines) segment produced an underwriting profit of $9.8 million in 2016 compared to an underwriting loss of $20.4 million in 2015 and an underwriting loss of $28.0 million in 2014. The underwriting profit in 2016 was driven by a commutation that was completed during the period. The underwriting loss in 2015 included $25.4 million of adverse loss reserve development on A&E exposures, compared to $32.8 million in 2014.

In March and October 2015, we completed two retroactive reinsurance transactions through which we ceded a significant portion of our A&E exposures to a third party. At the time of the transactions, reserves for unpaid losses and loss adjustment expenses on the policies ceded totaled $170.5 million. The first transaction resulted in a gain of $5.1 million, which was deferred and is being recognized in earnings in proportion to actual reinsurance recoveries received pursuant to the transaction. The second transaction resulted in an underwriting loss of $10.1 million, including $7.1 million of losses and loss adjustment expenses, all of which was recognized during 2015. Following the October 2015 retroactive reinsurance transaction, our actuaries increased their estimate of the ultimate losses on the remaining A&E claims and management increased prior years' loss reserves by $15.0 million. Without the diversification of a larger portfolio of loss reserves, there is greater uncertainty around the potential outcomes of the remaining claims, and management strengthened reserves accordingly.

We complete an annual review of our A&E exposures during the third quarter of the year unless circumstances suggest an earlier review is appropriate. During our 2015 and 2016 reviews, we determined that no adjustment to loss reserves was required. During our 2014 annual review, we increased our expectation of the severity of the outcome of certain claims subject to litigation. As the ultimate outcome of known claims increases, our expected ultimate closure value on unreported claims also increases. As a result, prior years' loss reserves for A&E exposures were increased by $27.2 million in 2014 related to our annual review.

A&E loss reserves are subject to significant uncertainty due to potential loss severity and frequency resulting from an uncertain and unfavorable legal climate. Our A&E reserves are not discounted to present value and are forecasted to pay out over the next 40 to 50 years as claims are settled. We seek to establish appropriate reserve levels for A&E exposures, including A&E exposures ceded to third parties under retroactive reinsurance transactions; however, these reserves could be subject to increases in the future. As of December 31, 2016, our reinsurance recoverable on unpaid losses for A&E exposures was 66% of our gross reserves for A&E exposures. See note 9(c) of the notes to consolidated financial statements for further discussion of our exposures to A&E claims.

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The following tables summarize the increases (decreases) in prior years' loss reserves by segment, as discussed above.

	Year Ended December 31, 2016
(dollars in millions)	U.S. Insurance			International Insurance			Reinsurance			Other Insurance (Discontinued Lines)			Total
U.S. Insurance:
General liability	$	(104.0	)										$	(104.0	)
Workers' compensation	(41.1		)										(41.1		)
Property:
Brokerage property	(17.9		)										(17.9		)
Inland marine	(20.1		)										(20.1		)
Professional liability:
Medical malpractice and specified medical	71.2												71.2
All other	(38.0		)										(38.0		)
International Insurance:
Professional liability				$	(66.6	)							(66.6		)
Marine and energy				(39.6		)							(39.6		)
General liability				(23.1		)							(23.1		)
Reinsurance:
Property							$	(67.6	)				(67.6		)
Other Insurance (Discontinued Lines):
A&E and other discontinued lines										$	(10.1	)	(10.1		)
Net other prior years' redundancy	(55.0		)	(35.4		)	(57.9		)	—			(148.3		)
Increase (decrease)	$	(204.9	)	$	(164.7	)	$	(125.5	)	$	(10.1	)	$	(505.2	)

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	Year Ended December 31, 2015
(dollars in millions)	U.S. Insurance			International Insurance			Reinsurance			Other Insurance (Discontinued Lines)			Total
U.S. Insurance:
General liability	$	(111.3	)										$	(111.3	)
Workers' compensation	(36.6		)										(36.6		)
Property:
Brokerage property	(35.0		)										(35.0		)
Inland marine	(27.5		)										(27.5		)
International Insurance:
Marine and energy				$	(64.8	)							(64.8		)
General liability				(60.9		)							(60.9		)
Professional liability				(39.7		)							(39.7		)
Reinsurance:
Casualty							$	(27.4	)				(27.4		)
Property							(21.1		)				(21.1		)
Other Insurance (Discontinued Lines):
Loss on retroactive reinsurance transaction										$	7.1		7.1
Other A&E exposures										18.3			18.3
Impact of retroactive reinsurance transactions on reserve volatility	(35.2		)	(32.3		)	(15.2		)	—			(82.7		)
Net other prior years' redundancy	(53.4		)	(51.1		)	(34.2		)	(7.5		)	(146.2		)
Increase (decrease)	$	(299.0	)	$	(248.8	)	$	(97.9	)	$	17.9		$	(627.8	)

	Year Ended December 31, 2014
(dollars in millions)	U.S. Insurance			International Insurance			Reinsurance			Other Insurance (Discontinued Lines)			Total
U.S. Insurance:
General liability	$	(93.4	)										$	(93.4	)
Professional liability:
Architects and engineers	20.2												20.2
All other	(48.4		)										(48.4		)
Workers' compensation	(25.7		)										(25.7		)
International Insurance:
Professional liability				$	(62.7	)							(62.7		)
Marine and energy				(45.9		)							(45.9		)
Reinsurance:
Property							$	(44.7	)				(44.7		)
Other Insurance (Discontinued Lines):
A&E exposures										$	32.8		32.8
Net other prior years' redundancy	(69.3		)	(58.0		)	(35.3		)	(5.1		)	(167.7		)
Increase (decrease)	$	(216.6	)	$	(166.6	)	$	(80.0	)	$	27.7		$	(435.5	)

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Over the past three years, we have experienced favorable development on prior years' loss reserves ranging from 5% to 7% of beginning of year net loss reserves. In 2016, we experienced favorable development of $505.2 million, or 6% of beginning of year net loss reserves, compared to $627.8 million, or 7% of beginning of year net loss reserves, in 2015 and $435.5 million, or 5% of beginning of year net loss reserves, in 2014.

It is difficult for management to predict the duration and magnitude of an existing trend and, on a relative basis, it is even more difficult to predict the emergence of factors or trends that are unknown today but may have a material impact on loss reserve development. In assessing the likelihood of whether the above favorable trends will continue and whether other trends may develop, we believe that a reasonably likely movement in prior years' loss reserves during 2017 would range from a deficiency of less than 1%, or $50 million, to a redundancy of approximately 6%, or $450 million, of December 31, 2016 net loss reserves.

Premiums

The following table summarizes gross premium volume by segment.

Gross Premium Volume
	Years Ended December 31,
(dollars in thousands)	2016		2015			2014
U.S. Insurance	$	2,635,266	$	2,504,096		$	2,493,823
International Insurance	1,119,815		1,164,866			1,200,403
Reinsurance	1,041,055		965,374			1,112,728
Other Insurance (Discontinued Lines)	509		(1,424		)	(1,441		)
Total	$	4,796,645	$	4,632,912		$	4,805,513

We monitor the effect of movements in foreign currency exchange rates on gross premium volume and earned premiums. To the extent there are significant variations in foreign currency exchange rates between the U.S. dollar and the foreign currencies in which our insurance business is transacted, management uses the change in gross premium volume and earned premiums at a constant rate of exchange to evaluate trends in premium volume. The impact of foreign currency translation is excluded, when significant, as the effect of fluctuations in exchange rates could distort the analysis of trends. When excluding the effect of foreign currency translation on changes in premium, management uses the current period average exchange rates to translate both the current period and the prior period foreign currency denominated gross premiums written and earned premiums.

Gross premium volume increased 4% in 2016 compared to 2015. The increase in gross premium volume was attributable to the U.S. Insurance and Reinsurance segments, partially offset by lower gross premium volume in our International Insurance segment. Gross premium volume in our U.S. Insurance segment increased 5% in 2016 compared to 2015 driven by higher premium volumes, primarily within our general liability and personal lines of business. The increase was also attributable to an additional week of gross premium volume during the first quarter of 2016 compared to the same period of 2015 based on differences in the timing of our underwriting systems closings. The timing of our underwriting systems closings has a negligible impact on our premium earnings as premiums are earned over the policy period. Gross premium volume in our International Insurance segment decreased 4% in 2016 compared to 2015 primarily due to an unfavorable impact from foreign currency exchange rate movements, as well as lower premium volume within our marine and energy product lines. Gross premium volume in our Reinsurance segment increased 8% in 2016 compared to 2015 driven by our general liability and property lines, due to new business and a favorable impact from the timing of renewals on multi-year contracts in 2016 compared to 2015. These increases were partially offset by lower gross premium volume within our auto, professional liability and credit and surety reinsurance product lines.

Gross premium volume decreased 4% in 2015 compared to 2014. At a constant rate of exchange, gross premium volume would have decreased 2% in 2015 compared to 2014. The change is primarily attributable to a 13% decrease in gross premium volume in the Reinsurance Segment, or a 10% decrease at a constant rate of exchange. The decrease in gross premium volume in our Reinsurance segment was driven by changes in our auto reinsurance book. During 2014, we ceased writing auto reinsurance in the United Kingdom and decreased our quota share percentage on our non-standard auto reinsurance business in the United States. Additionally, lower gross premium volume in our general liability and property lines within the Reinsurance segment was partially offset by higher gross premium volume in our professional liability lines. Gross premium volume in our International Insurance segment decreased 3% in 2015 compared to 2014. At a constant rate of exchange, gross premium volume in the International Insurance segment would have increased 2% in 2015 compared to 2014.

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We have seen small price decreases across many of our product lines during 2016, especially in our international business across most of our property product lines, as well as on our marine and energy lines. Our large account business is also subject to more pricing pressure. Competition remains strong in the reinsurance market, however the rate of price decline has slowed and in a few cases stabilized. We continue to see pricing margins in most reinsurance lines of business. Despite stabilization of prices on certain product lines during the last several years, we still consider the overall property and casualty insurance market to be soft. When we believe the prevailing market price will not support our underwriting profit targets, the business is not written. As a result of our underwriting discipline, gross premium volume may vary when we alter our product offerings to maintain or improve underwriting profitability.

The following table summarizes net written premiums by segment.

Net Written Premiums
	Years Ended December 31,
(dollars in thousands)	2016		2015		2014
U.S. Insurance	$	2,237,163	$	2,106,490	$	2,071,466
International Insurance	864,494		888,214		889,336
Reinsurance	898,728		824,324		956,584
Other Insurance (Discontinued Lines)	635		265		(371		)
Total	$	4,001,020	$	3,819,293	$	3,917,015

Net retention of gross premium volume was 83% in 2016 and 82% in 2015 and 2014. Retention increased in all three of our ongoing underwriting segments in 2016 compared to 2015. These increases were largely due to changes in mix of business.

In 2015, higher retention in the U.S. Insurance and International Insurance segments was offset by lower retention in the Reinsurance segment compared to 2014. Retention rate changes in 2015 compared to 2014 were also driven by changes in our mix of business. We purchase reinsurance and retrocessional reinsurance in order to manage our net retention on individual risks and enable us to write policies with sufficient limits to meet policyholder needs.

The following table summarizes earned premiums by segment.

Earned Premiums
	Years Ended December 31,
(dollars in thousands)	2016		2015		2014
U.S. Insurance	$	2,175,332	$	2,105,212	$	2,022,860
International Insurance	853,512		879,426		909,679
Reinsurance	836,264		838,543		908,385
Other Insurance (Discontinued Lines)	762		351		(12		)
Total	$	3,865,870	$	3,823,532	$	3,840,912

Consolidated earned premiums for 2016 increased 1% compared to 2015. Higher earned premiums in our U.S. Insurance segment more than offset lower earned premiums in our International Insurance segment. The increase in earned premiums in our U.S. Insurance segment was primarily due to the increases in gross premium volume as previously discussed. The decrease in earned premiums in our International Insurance segment was primarily due to an unfavorable impact from movements in foreign currency exchange rates. Additionally, higher earned premiums in our professional liability product lines were offset by lower earned premiums in our marine and energy product lines within the International Insurance segment.

Consolidated earned premiums for 2015 decreased slightly compared to 2014. Higher earned premiums in our U.S. Insurance segment were offset by lower earned premiums in the Reinsurance segment and the effects of foreign currency exchange rate movements in our International Insurance and Reinsurance segments. The increase in earned premiums in our U.S. Insurance segment in 2015 was primarily due to higher earned premiums in our program business, general liability lines and personal lines compared to 2014. Lower earned premiums in the Reinsurance segment were due to lower gross premium volume. At a constant rate of exchange, consolidated earned premiums would have increased 2% in 2015 compared to 2014.

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Life and Annuity Benefits

The Other Insurance (Discontinued Lines) segment included other revenues of $1.9 million and other expenses of $26.5 million for 2016, other revenues of $0.6 million and other expenses of $29.1 million for 2015, and other revenues of $1.6 million and other expenses of $37.1 million for 2014 related to our life and annuity reinsurance business. This business is in run-off, and we are not writing any new life and annuity reinsurance contracts. The life and annuity benefit reserves are recorded on a net present value basis using assumptions that were determined when the portfolio of contracts was acquired. The accretion of this discount is recognized in the statement of income and comprehensive income as other expenses. The decrease in other expenses in 2015 compared to 2014 is primarily attributable to lower accretion expense, as a result of a favorable impact from changes in foreign currency exchange rates in 2015 compared to 2014. Invested assets and the related investment income that support the life and annuity reinsurance contracts are reported in the Investing segment. As a result, we expect the results reported in the Other Insurance (Discontinued Lines) segment attributable to our life and annuity business will continue to reflect losses in future periods due to the accretion of the discount on the life and annuity benefit reserves, which are forecast to pay out over the next 40 to 50 years. Other revenues attributable to the life and annuity business included in the Other Insurance (Discontinued Lines) segment represent ongoing premium adjustments on existing contracts.

On April 24, 2015, we completed a novation that transferred our obligations under a reinsurance contract for life and annuity benefit policies to a third party in exchange for cash payments totaling $29.0 million, net of commissions. At the time of the transaction, reserves for life and annuity benefits on the novated reinsurance contract totaled $32.6 million, resulting in a gain of $3.6 million that was recorded as an offset to other expenses.

Investing Results

Our business strategy recognizes the importance of both consistent underwriting and operating profits and superior investment returns to build shareholder value. We rely on sound underwriting practices to produce investable funds while minimizing underwriting risk.

The following table summarizes our investment performance.

	Years Ended December 31,
(dollars in thousands)	2016			2015			2014
Net investment income	$	373,230		$	353,213		$	363,230
Net realized investment gains	$	65,147		$	106,480		$	46,000
Change in net unrealized gains on investments	$	342,111		$	(457,584	)	$	981,035
Investment yield (1)	2.4		%	2.3		%	2.4		%
Taxable equivalent total investment return, before foreign currency effect	5.0		%	0.5		%	8.9		%
Taxable equivalent total investment return	4.4		%	(0.7		)%	7.4		%
Invested assets, end of year	$	19,058,666		$	18,181,345		$	18,637,701

⁽¹⁾  Investment yield reflects net investment income as a percentage of monthly average invested assets at amortized cost.

Investments, cash and cash equivalents and restricted cash and cash equivalents (invested assets) increased 5% in 2016. The increase in the investment portfolio in 2016 was attributable to an increase in net unrealized gains on investments of $342.1 million, net proceeds from our net issuance of long-term debt of $271.7 million and cash flows from operations of $534.6 million. Invested assets decreased 2% in 2015. The decrease in the investment portfolio in 2015 was attributable to a decrease in net unrealized gains on investments of $457.6 million.

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During 2014, we replaced fixed maturity corporate and mortgage-backed securities with fixed maturity tax-exempt municipal securities and equity securities as we still were repositioning the investment portfolio acquired through the 2013 Alterra acquisition to be more consistent with our historical investment portfolio allocation. We also allocated more cash and cash equivalents to short-term investments to achieve higher returns while still maintaining adequate liquidity and continued to limit our allocation of funds for purchases of fixed maturities. In 2015, we continued to gradually build liquidity with higher cash balances due to continuing low interest rates and sales of certain securities from our equity portfolio. We increased our holdings of cash and cash equivalents and short-term investments and reduced our holdings of fixed maturities. During 2016, we increased our holdings of equity securities and fixed maturities and decreased our holdings of cash and cash equivalents and short-term investments in order to achieve higher returns and to more closely match the duration of our fixed maturity portfolio with our insurance liabilities. At December 31, 2016, short-term investments, cash and cash equivalents and restricted cash and cash equivalents represented 23% of our invested assets compared to 26% at December 31, 2015. Fixed maturities represented 52% of our invested assets at both December 31, 2016 and 2015. Equity securities at December 31, 2016 represented 25% of our invested assets compared to 22% at December 31, 2015.

Net investment income increased 6% in 2016 compared to 2015. Net investment income in 2016 included higher interest income on our fixed maturity portfolio compared to 2015, primarily due to increased holdings of fixed maturity securities. An increase in short-term investment income, driven by higher short-term interest rates, was largely offset by lower dividend income in 2016 compared to 2015 as equity securities purchased in 2016 have lower dividend yields than the equity securities sold in late 2015 and early 2016.

Net investment income decreased 3% in 2015 compared to 2014. Net investment income in 2015 included lower bond income on our fixed maturity portfolio primarily due to the unfavorable impact of foreign currency exchange rate movements in 2015 compared to 2014. Net investment income in 2015 also included higher dividend income on our equity portfolio due to higher equity security holdings during 2015 compared to 2014.

Net realized investment gains were $65.1 million, $106.5 million and $46.0 million in 2016, 2015 and 2014, respectively. Net realized investment gains include gains and losses from sales of securities, losses from write downs for other-than-temporary declines in the estimated fair value of investments and gains and losses on securities measured at fair value through net income. See note 3(f) of the notes to consolidated financial statements for further details on the components of net realized investment gains. In 2016, 2015 and 2014, net realized investment gains were related to equity securities and fixed maturities that were sold because of our decision to reallocate capital to other equity securities or fixed maturities with greater potential for long-term investment returns. During 2016 and 2015, we liquidated certain equity securities in our portfolio in light of our outlook on the economic and competitive environment facing those companies. Given our long-term focus, variability in the timing of realized and unrealized gains and losses is to be expected.

Net realized investment gains in 2016, 2015 and 2014 included $7.7 million, $5.8 million and $18.9 million, respectively, of realized losses from sales of fixed maturities and equity securities. Proceeds received on securities sold at a loss were $138.3 million in 2016, $154.5 million in 2015 and $1.1 billion in 2014. During 2014, we repositioned the investment portfolio acquired through the Alterra acquisition to be more consistent with our target portfolio allocation.

Approximately 52% of the gross realized losses in 2016 related to securities that had been in a continuous unrealized loss position for less than one year. Gross realized losses in 2016 included $18.4 million of write downs for other-than-temporary declines in the estimated fair value of investments. These write downs were made with respect to 22 equity securities. We complete a detailed analysis each quarter to assess whether the decline in the fair value of any investment below its cost basis is deemed other-than-temporary. At December 31, 2016, we held securities with gross unrealized losses of $100.0 million, or less than 1% of invested assets. All securities with unrealized losses were reviewed, and we believe that there were no other securities with indications of declines in estimated fair value that were other-than-temporary at December 31, 2016. However, given the volatility in the debt and equity markets, we caution readers that further declines in fair value could be significant and may result in additional other-than-temporary impairment charges in future periods. Variability in the timing of realized and unrealized gains and losses is to be expected. See note 3(b) of the notes to consolidated financial statements for further discussion of unrealized losses.

Approximately 72% of the gross realized losses in 2015 related to securities that had been in a continuous unrealized loss position for less than one year. Gross realized losses in 2015 included $44.5 million of write downs for other-than-temporary declines in the estimated fair value of investments. These write downs were made with respect to 21 equity securities.

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Approximately 92% of the gross realized losses in 2014 related to securities that had been in a continuous unrealized loss position for less than one year. Gross realized losses in 2014 included $4.8 million of write downs for other-than-temporary declines in the estimated fair value of investments. These write downs were made with respect to 24 equity securities and three fixed maturities.

In 2016, net unrealized gains on investments increased $342.1 million due to an increase in the estimated fair value of our equity portfolio, as a result of strong overall equity market performance, partly offset by a decrease in the fair value of our fixed maturity portfolio, as interest rates increased during 2016. In 2015, net unrealized gains on investments decreased $457.6 million due to a decrease in the estimated fair value of our equity portfolio, as a result of lower overall equity market performance, and our fixed maturity portfolio, as interest rates increased during 2015. In 2014, net unrealized gains on investments increased $981.0 million due to an increase in the estimated fair value of our equity portfolio, as a result of strong overall equity market performance, and our fixed maturity portfolio, as interest rates decreased during 2014.

We also evaluate our investment performance by analyzing taxable equivalent total investment return, which is a non-GAAP financial measure. Taxable equivalent total investment return includes items that impact net income, such as coupon interest on fixed maturities, dividends on equity securities and realized investment gains or losses, as well as changes in unrealized gains or losses, which do not impact net income. Certain items that are included in net investment income have been excluded from the calculation of taxable equivalent total investment return, such as amortization and accretion of premiums and discounts on our fixed maturity portfolio, to provide a comparable basis for measuring our investment return against industry investment returns. The calculation of taxable equivalent total investment return also includes the current tax benefit associated with income on certain investments that is either taxed at a lower rate than the statutory income tax rate or is not fully included in federal taxable income. We believe the taxable equivalent total investment return is a better reflection of the economics of our decision to invest in certain asset classes. We focus on our long-term investment return, understanding that the level of realized and unrealized investment gains or losses may vary from one period to the next.

The following table reconciles investment yield to taxable equivalent total investment return.

	Years Ended December 31,
	2016		2015		2014
Investment yield (1)	2.4	%	2.3	%	2.4	%
Adjustment of investment yield from amortized cost to fair value	(0.4	)%	(0.4	)%	(0.4	)%
Net amortization of net premium on fixed maturity securities	0.4	%	0.5	%	0.6	%
Net realized investment gains and change in net unrealized gains on investments	2.3	%	(2.0	)%	5.9	%
Taxable equivalent effect for interest and dividends (2)	0.4	%	0.4	%	0.4	%
Other (3)	(0.7	)%	(1.5	)%	(1.5	)%
Taxable equivalent total investment return	4.4	%	(0.7	)%	7.4	%

⁽¹⁾  Investment yield reflects net investment income as a percentage of monthly average invested assets at amortized cost.

⁽²⁾  Adjustment to tax-exempt interest and dividend income to reflect a taxable equivalent basis.

⁽³⁾  Adjustment to reflect the impact of changes in foreign currency exchange rates and time-weighting the inputs to the calculation of taxable equivalent total investment return.

Markel Ventures Operations

Our Markel Ventures operations are comprised of a diverse portfolio of industrial and service businesses that operate outside of the specialty insurance marketplace. These businesses are viewed by management as separate and distinct from our insurance operations. While each of these businesses are operated independently from one another, we aggregate their financial results into two industry groups: manufacturing and non-manufacturing. Our manufacturing operations are comprised of manufacturers of transportation and other industrial equipment. Our non-manufacturing operations are comprised of businesses from several industry groups, including consumer goods and services (including healthcare) and business services.

We consolidate our Markel Ventures operations on a one-month lag. Operating revenues and expenses associated with our Markel Ventures operations are included in other revenues and other expenses in the consolidated statements of income and comprehensive income. See note 21 of the notes to consolidated financial statements for the components of other revenues and other expenses associated with Markel Ventures.

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The following tables summarize the amounts recognized in the consolidated balance sheets and consolidated statements of income related to Markel Ventures.

	December 31,
(dollars in thousands)	2016			2015
ASSETS
Cash and cash equivalents	$	105,316		$	120,889
Receivables	97,921			90,977
Goodwill	237,767			254,086
Intangible assets	234,113			261,333
Other assets	531,106			504,480
Total Assets	$	1,206,223		$	1,231,765
LIABILITIES AND EQUITY
Senior long-term debt and other debt (1)	$	294,702		$	322,375
Other liabilities	217,804			268,956
Total Liabilities	512,506			591,331
Redeemable noncontrolling interests	73,678			62,958
Shareholders' equity (2)	621,639			579,981
Noncontrolling interests	(1,600		)	(2,505		)
Total Equity	620,039			577,476
Total Liabilities and Equity	$	1,206,223		$	1,231,765

⁽¹⁾ Senior long-term debt and other debt as of December 31, 2016 and 2015 included $211.0 million and $216.9 million, respectively, of debt due to other subsidiaries of Markel Corporation, which is eliminated in consolidation.

⁽²⁾ Shareholders' equity includes $520.7 million and $520.3 million as of December 31, 2016 and 2015, respectively, which represents Markel Corporation's investment in Markel Ventures and is eliminated in consolidation.

	Years ended December 31,
(dollars in thousands)	2016		2015		2014
OPERATING REVENUES
Net investment income	$	109	$	5	$	4
Other revenues	1,214,449		1,047,516		838,121
Total Operating Revenues	1,214,558		1,047,521		838,125
OPERATING EXPENSES
Amortization of intangible assets	29,105		27,443		24,283
Other expenses	1,071,943		978,058		775,219
Total Operating Expenses	1,101,048		1,005,501		799,502
Operating Income	113,510		42,020		38,623
Interest expense (1)	15,718		13,982		13,400
Income Before Income Taxes	97,792		28,038		25,223
Income tax expense	36,005		10,641		13,160
Net Income	61,787		17,397		12,063
Net income attributable to noncontrolling interests	5,615		6,370		2,506
Net Income to Shareholders	$	56,172	$	11,027	$	9,557

⁽¹⁾ Interest expense for the years ended December 31, 2016, 2015 and 2014 includes intercompany interest expense of $9.7 million, $9.4 million and $8.7 million, respectively, which is eliminated in consolidation.

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Revenues from our Markel Ventures operations increased in 2016 compared to 2015 primarily due to the acquisition of CapTech in December 2015. We also experienced higher sales volume from one of our transportation-related manufacturing businesses. Net income to shareholders from our Markel Ventures operations in 2016 and 2015 were impacted by increases in our estimates of contingent consideration obligations and goodwill impairment charges, which combined were more significant in 2015 than 2016. During 2016, operating expenses for our non-manufacturing operations included $10.3 million as a result of an increase in our estimate of the contingent consideration obligation related to the acquisition of CapTech. A portion of the purchase consideration for CapTech is based on post-acquisition earnings through 2018, as defined in the purchase agreement. During 2016, our estimate of CapTech's earnings increased beyond our initial projection. As of December 31, 2016, the fair value of our outstanding contingent consideration was $16.2 million, which is based on the maximum amount payable under the purchase agreement and is payable over the next three years. During 2015, operating expenses for our manufacturing operations included $31.2 million as a result of an increase in our estimate of the contingent consideration obligation related to the July 2014 acquisition of Cottrell. A portion of the purchase consideration for Cottrell was based on post-acquisition earnings through 2015, as defined in the purchase agreement. During 2015, our estimate of Cottrell's 2015 earnings increased beyond our initial projection. As a result, our estimate of the fair value of the contingent consideration increased by $31.2 million during 2015. As of December 31, 2015, the fair value of our outstanding contingent consideration obligation was $44.7 million, which was paid in full during 2016. Net income to shareholders in our manufacturing operations in 2016 was net of an $18.7 million goodwill impairment charge in the fourth quarter related to one of our industrial manufacturing reporting units. Net income to shareholders in our non-manufacturing operations in 2015 was net of a $14.9 million goodwill impairment charge in the fourth quarter related to one of our healthcare reporting units. Net income to shareholders from our Markel Ventures operations also increased in 2016 compared to 2015 due to higher sales volumes in one of our transportation-related manufacturing businesses, improved results across our non-manufacturing businesses and the contribution of earnings from CapTech, which were partially offset by the impact of the contingent consideration adjustment previously discussed.

Revenues from our Markel Ventures operations increased in 2015 compared to 2014 primarily due to the acquisition of Cottrell in July 2014. We also experienced higher revenues within certain of our other manufacturing operations in 2015, due in part to higher sales volumes in 2015 compared to 2014, as a result of increased demand for equipment manufactured to support transportation-related industries. Revenues for the year ended December 31, 2015 also included growth in certain of our non-manufacturing operations. Net income to shareholders from our Markel Ventures operations increased in 2015 compared to 2014 due to more favorable results in our manufacturing operations in 2015, partially offset by less favorable results in our non-manufacturing operations in 2015. The increase in net income to shareholders in our manufacturing operations in 2015 was due in part to increased revenues, as described above, partially offset by the $31.2 million increase in our estimate of the fair value of the contingent consideration obligation related to the acquisition of Cottrell. The decrease in net income to shareholders in our non-manufacturing operations was primarily attributable to an increase in expenses at certain of our non-manufacturing operations. Net income to shareholders in our non-manufacturing operations was net of goodwill impairment charges of $14.9 million and $13.7 million in the fourth quarters of 2015 and 2014, respectively, related to one of our healthcare reporting units.

The following table summarizes the cash flows attributable to Markel Ventures for the years ended December 31, 2016, 2015 and 2014.

	Years ended December 31,
(dollars in thousands)	2016			2015			2014
Cash and cash equivalents, beginning of year	$	120,889		$	106,552		$	61,742
Net cash provided by operating activities	100,105			166,702			59,915
Net cash used by investing activities	(55,293		)	(96,073		)	(189,729		)
Net cash provided (used) by financing activities (1,2)	(60,385		)	(56,292		)	174,624
Increase (decrease) in cash and cash equivalents	(15,573		)	14,337			44,810
Cash and cash equivalents, end of year	$	105,316		$	120,889		$	106,552

⁽¹⁾ Net cash provided (used) by financing activities for the years ended December 31, 2015 and 2014 includes capital contributions from our holding company of $22.8 million and $64.8 million, respectively, which are eliminated in consolidation.

⁽²⁾ Net cash used by financing activities for the years ended December 31, 2016 and 2015 includes net repayments of debt of $5.9 million and $36.0 million, respectively, which are eliminated in consolidation. Net cash provided by financing activities for the year ended December 31, 2014 includes net additions to debt of $136.5 million, which are eliminated in consolidation.

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Markel Ventures earnings before interest, income taxes, depreciation and amortization (EBITDA) is a non-GAAP financial measure. We use Markel Ventures EBITDA as an operating performance measure in conjunction with U.S. GAAP measures, including revenues and net income, to monitor and evaluate the performance of our Markel Ventures operations. Because EBITDA excludes interest, income taxes, depreciation and amortization, it provides an indicator of economic performance that is useful to both management and investors in evaluating our Markel Ventures businesses as it is not affected by levels of debt, interest rates, effective tax rates, levels of depreciation and amortization resulting from purchase accounting. The following table reconciles consolidated net income to shareholders, to Markel Ventures EBITDA, net of noncontrolling interests.

	Years Ended December 31,
(dollars in thousands)	2016			2015			2014
Net income to shareholders	$	455,689		$	582,772		$	321,182
Income before income taxes from other Markel operations	(532,989		)	(714,067		)	(415,156		)
Income tax expense from other Markel operations	133,472			142,322			103,531
Markel Ventures net income to shareholders	56,172			11,027			9,557
Interest expense (1)	14,900			13,287			12,184
Income tax expense	34,502			10,710			12,848
Depreciation expense	32,759			30,478			24,706
Amortization of intangible assets	26,796			25,776			22,032
Markel Ventures EBITDA - Total	$	165,129		$	91,278		$	81,327
Markel Ventures EBITDA - Manufacturing	$	120,993		$	88,822		$	71,133
Markel Ventures EBITDA - Non-Manufacturing	44,136			2,456			10,194
Markel Ventures EBITDA - Total	$	165,129		$	91,278		$	81,327

⁽¹⁾ Interest expense for the years ended December 31, 2016,2015 and 2014includes intercompany interest expense of $9.7 million, $9.4 million and $8.7 million, respectively.

EBITDA from our Markel Ventures operations in 2016 and 2015 were impacted by increases in our estimates of contingent consideration obligations and goodwill impairment charges, as described above, which combined were more significant in 2015 than 2016. EBITDA also increased in 2016 compared to 2015 due to higher sales volumes in one of our transportation-related manufacturing businesses, improved results across our non-manufacturing businesses and the contribution of earnings from CapTech, which were partially offset by the impact of the contingent consideration adjustment previously discussed.

EBITDA from our Markel Ventures manufacturing operations increased in 2015 compared to 2014 due to increased revenues, described above, partially offset by an increase in our estimate of the fair value of the contingent consideration obligation related to the acquisition of Cottrell. EBITDA from our Markel Ventures non-manufacturing operations decreased in 2015 compared to 2014 due to higher expenses at certain of our non-manufacturing operations. EBITDA from our Markel Ventures non-manufacturing operations was net of a $14.9 million and $13.7 million goodwill impairment charge in 2015 and 2014, respectively, related to one of our healthcare reporting units.

Interest Expense, Loss on Early Extinguishment of Debt and Income Taxes

Interest Expense and Loss on Early Extinguishment of Debt

Interest expense was $129.9 million in 2016 compared to $118.3 million in 2015 and $117.4 million in 2014. The increase in interest expense in 2016 compared to 2015 was due to interest expense associated with our 5.0% unsecured senior notes which were issued in the second quarter of 2016, partially offset by the partial purchase of our 7.125% unsecured senior notes and our 7.35% unsecured senior notes in the second quarter of 2016.

In the second quarter of 2016, we issued $500 million of 5.0% unsecured senior notes due April 5, 2046. Net proceeds were $493.1 million. We used a portion of these proceeds to purchase $70.2 million of principal on our 7.35% unsecured senior notes due 2034 and $108.8 million of principal on our 7.125% unsecured senior notes due 2019 through a tender offer at a total purchase price of $95.0 million and $126.4 million, respectively.

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In connection with the tender offer and purchase, we recognized a loss on early extinguishment of debt of $44.1 million during 2016. Replacing this debt with our 5.0% unsecured senior notes due April 5, 2046 extended the average term of our unsecured senior notes at a more favorable interest rate.

Income Taxes

The effective tax rate was 27% in 2016 compared to 21% in 2015 and 26% in 2014. In 2016 and 2014, the effective tax rate differs from the statutory rate of 35% primarily as a result of tax-exempt investment income. In 2015, the effective tax rate differs from the statutory rate of 35% primarily as a result of tax credits for foreign taxes paid and tax-exempt investment income. In previous periods, certain foreign taxes paid were not available for use as tax credits against our U.S. provision for income taxes. Based on our earnings from our foreign operations in 2015, significant foreign taxes paid, both in 2015 and prior periods, were used as credits against our U.S. provision for income taxes in 2015. Our recognition of these tax credits in 2015 had a favorable impact on our 2015 effective tax rate of approximately 8%, compared to 2% in 2016 and 1% in 2014. Foreign tax credits of the magnitude recognized in 2015 are not expected in future periods.

The decrease in the effective tax rate in 2015 compared to 2014 resulting from foreign tax credits was partially offset by the impact of anticipating a smaller tax benefit related to tax-exempt investment income which resulted from having higher income before income taxes in 2015 compared to 2014.

With few exceptions, we are no longer subject to income tax examination by tax authorities for years ended before January 1, 2013. During 2016, the Internal Revenue Service completed its examination of our 2012 U.S. federal income tax return. There were no adjustments to our income tax liabilities as a result of this examination. See note 8 of the notes to consolidated financial statements for a discussion of factors affecting the realization of our gross deferred tax assets and unrecognized tax benefits resulting from uncertain tax positions taken or expected to be taken in our income tax returns.

Comprehensive Income to Shareholders

Comprehensive income to shareholders was $667.0 million, $232.7 million and $935.9 million in 2016, 2015 and 2014, respectively. Comprehensive income to shareholders for 2016 included net income to shareholders of $455.7 million and an increase in net unrealized gains on investments, net of taxes, of $242.2 million. Comprehensive income to shareholders for 2015 included net income to shareholders of $582.8 million, a decrease in net unrealized gains on investments, net of taxes, of $320.5 million and a decrease in foreign currency translation adjustments, net of taxes, of $29.3 million. Comprehensive income to shareholders for 2014 included net income to shareholders of $321.2 million, an increase in net unrealized gains on investments, net of taxes, of $661.7 million and a decrease in foreign currency translation adjustments, net of taxes, of $32.2 million.

For the years ended December 31, 2016 and 2015, book value per share increased 8% and 3%, respectively, primarily due to comprehensive income to shareholders, as described above.

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The following graph presents book value per share and the five-year compound annual growth rate (CAGR) in book value per share for the past five years as of December 31.

Liquidity and Capital Resources

We seek to maintain prudent levels of liquidity and financial leverage for the protection of our policyholders, creditors and shareholders. Our debt to capital ratio was 23% at December 31, 2016 and 22% at December 31, 2015.

At December 31, 2016, our holding company (Markel Corporation) held $2.5 billion of invested assets, which approximated 16 times annual interest expense of the holding company, compared to $1.6 billion of invested assets at December 31, 2015. The increase in invested assets is primarily due to a return of capital and dividends received from our subsidiaries of $472.3 million, net proceeds from our net issuance of long-term debt of $271.7 million and proceeds from the repayment of intercompany notes receivable. In order to maintain prudent levels of liquidity, we seek to maintain invested assets at Markel Corporation of at least two times annual interest expense. The excess liquidity at Markel Corporation is available to increase capital at our insurance subsidiaries, complete acquisitions, repurchase shares of our common stock or retire debt.

Our Board of Directors has approved the repurchase of up to $300 million of common stock under a share repurchase program (the Program). Under the Program, we may repurchase outstanding shares of common stock from time to time, primarily through open-market transactions. The Program has no expiration date but may be terminated by the Board of Directors at any time. As of December 31, 2016, we had repurchased 96,345 shares of common stock at a cost of $70.7 million under the Program.

Our insurance operations collect premiums and pay claims, reinsurance costs and operating expenses. Premiums collected and positive cash flows from the insurance operations are invested primarily in short-term investments and long-term fixed maturities. Short-term investments held by our insurance subsidiaries provide liquidity for projected claims, reinsurance costs and operating expenses. As a holding company, Markel Corporation receives cash from its subsidiaries as reimbursement for operating and other administrative expenses it incurs. The reimbursements are made within the guidelines of various management agreements between the holding company and its subsidiaries.

The holding company has historically relied upon dividends from its domestic subsidiaries to meet debt service obligations. Under the insurance laws of the various states in which our domestic insurance subsidiaries are incorporated, an insurer is restricted in the amount of dividends it may pay without prior approval of regulatory authorities. At December 31, 2016, our domestic insurance subsidiaries and Markel Bermuda Limited could pay ordinary dividends of $877.8 million during the following twelve months under these laws.

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There are also regulatory restrictions on the amount of dividends that our foreign insurance subsidiaries may pay based on applicable laws in the United Kingdom. At December 31, 2016, earnings of our foreign subsidiaries, with the exception of certain of our Bermuda subsidiaries, are considered reinvested indefinitely and no provision for deferred United States income taxes has been recorded. At December 31, 2016, cash and cash equivalents, restricted cash and cash equivalents and short-term investments of $822.5 million were held by our foreign subsidiaries. We do not expect the amount of cash and cash equivalents, restricted cash and cash equivalents and short-term investments that are attributable to earnings that are considered reinvested indefinitely, and not available for distributions to the holding company, to have a material effect on our liquidity or capital resources.

Net cash provided by operating activities was $534.6 million, $651.2 million and $716.8 million in 2016, 2015 and 2014, respectively. The decrease in net cash provided by operating activities in 2016 compared to 2015 was due in part to higher claims payments in the U.S. Insurance segment, in particular on our professional liability lines of business, as well as higher payments for employee profit sharing in 2016 compared to 2015. Net cash provided by operating activities in 2016 was net of a $51.9 million payment made in connection with the commutation of a property and casualty deposit contract. Cash flows in 2016 also included payments totaling $47.0 million to settle contingent purchase consideration obligations, of which $32.9 million was included in operating activities. Net cash provided by operating activities in 2015 was net of cash payments totaling $156.4 million made in connection with two retroactive reinsurance transactions completed in 2015, in which we ceded two portfolios of policies comprised of liabilities arising from A&E exposures to a third party. Net cash provided by operating activities in 2015 was also net of a $29.0 million cash payment made to transfer our obligations under a reinsurance contract for life and annuity benefits to a third party. Net cash provided by operating activities also increased in 2015 compared to 2014 due to higher cash flows attributable to our Markel Ventures operations in 2015, which were partially offset by higher payments for income taxes compared to the same period of 2014.

Net cash used by investing activities was $1.5 billion in 2016 compared to net cash provided by investing activities of $125.8 million in 2015 and net cash used by investing activities of $622.2 million in 2014. Net cash used by investing activities in 2016 included the purchases of fixed maturities and equity securities, net of proceeds from sales, of $877.0 million. We also allocated more cash and cash equivalents to short-term investments to achieve higher returns while still maintaining adequate liquidity. Net cash provided by investing activities in 2015 included proceeds from the sales and maturities of investments, net of purchases of investments, of $466.3 million, partially offset by $261.5 million, net of cash acquired, used for acquisitions, and $79.8 million used to purchase property and equipment. Net cash used by investing activities in 2014 included $319.1 million of cash, net of cash acquired, used to complete acquisitions. We received cash from our equity method investments of $107.3 million during 2014, which includes redemptions from our hedge fund portfolio acquired through the Alterra acquisition that was included in other assets on the consolidated balance sheets. See "Investing Results" for further discussion of changes in our allocation of funds within the investment portfolio in 2014, 2015 and 2016. Cash flow from investing activities is affected by various factors such as anticipated payment of claims, financing activity, acquisition opportunities and individual buy and sell decisions made in the normal course of our investment portfolio management.

Invested assets increased to $19.1 billion at December 31, 2016 from $18.2 billion at December 31, 2015. Net unrealized gains on investments, net of taxes, were $1.7 billion at December 31, 2016 compared to $1.5 billion at December 31, 2015. The increase in net unrealized gains on investments, net of taxes, in 2016 was primarily due to an increase in the estimated fair value of our equity portfolio, as a result of strong overall equity market performance, partly offset by a decrease in the value of our fixed maturity portfolio, as interest rates increased during 2016.

Net cash provided by financing activities was $152.0 million in 2016 compared to net cash used by financing activities of $74.2 million and $67.1 million in 2015 and 2014, respectively. During 2016, we issued $500 million of 5.0% unsecured senior notes due April 5, 2046. Net proceeds were $493.1 million. We used a portion of these proceeds to purchase $70.2 million of principal on our 7.35% Senior Notes due 2034 and $108.8 million of principal on our 7.125% Senior Notes due 2019 through a tender offer at a total purchase price of $95.0 million and $126.4 million, respectively. We also expect to use the proceeds from this issuance to retire our 7.20% unsecured senior notes when they come due April 14, 2017 ($90.6 million aggregate principal amount of those notes was outstanding at December 31, 2016) and the remainder for general corporate purposes. During 2016, 2015 and 2014, we used cash of $3.2 million, $12.5 million and $25.9 million, respectively, to purchase additional interests in our Markel Ventures businesses. During 2016, 2015 and 2014, cash of $51.1 million, $31.5 million and $26.1 million, respectively, was used to repurchase shares of our common stock.

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In recent years, we have completed numerous reinsurance commutations, which involve the termination of ceded or assumed reinsurance contracts. Our commutation strategy related to ceded reinsurance contracts is to reduce credit exposure and eliminate administrative expenses associated with the run-off of reinsurance placed with certain reinsurers. Our commutation strategy related to assumed reinsurance contracts is to reduce our loss exposure to long-tailed liabilities assumed under reinsurance agreements that were entered into by companies we acquired prior to our acquisition. We will continue to pursue commutations, or similar reinsurance transactions, when we believe they meet our objectives. As previously discussed, during 2015, we completed two retroactive reinsurance transactions to cede two portfolios of policies primarily comprised of liabilities arising from A&E exposures to a third party. Cash payments for these two retroactive reinsurance transactions totaled $156.4 million. See "Critical Accounting Estimates" for further discussion. We also completed a novation that transferred our obligations under a reinsurance contract for life and annuity benefit policies to a third party in exchange for cash payments totaling $29.0 million, net of commissions. In 2016, we completed a commutation that transferred our obligations under a property and casualty deposit contract in exchange for cash payments totaling $51.9 million. While we recognize that these transactions have the short term impact of reducing investment income, we have significantly reduced the uncertainty around these exposures and increased our flexibility regarding capital allocation.

We have credit risk to the extent any of our reinsurers are unwilling or unable to meet their obligations under our ceded reinsurance agreements. We attempt to minimize credit exposure to reinsurers through adherence to internal reinsurance guidelines. We monitor changes in the financial condition of each of our reinsurers, and we assess our concentration of credit risk on a regular basis. At December 31, 2016, our reinsurance recoverable balance for the ten largest reinsurers was $1.4 billion, representing 67% of our consolidated balance, before considering allowances for bad debts. All of our ten largest reinsurers were rated "A" or better by A.M. Best. We are the beneficiary of letters of credit, trust accounts and funds withheld in the aggregate amount of $418.4 million at December 31, 2016, collateralizing reinsurance recoverable balances due from our ten largest reinsurers. See note 15 of the notes to consolidated financial statements for further discussion of reinsurance recoverables and exposures. While we believe that net reinsurance recoverable balances are collectible, deterioration in reinsurers' ability to pay, or collection disputes, could adversely affect our operating cash flows, financial position and results of operations.

Unpaid losses and loss adjustment expenses were $10.1 billion and $10.3 billion at December 31, 2016 and 2015, respectively. The following table summarizes case reserves and IBNR reserves, by segment. As described in note 9 to consolidated financial statements, unpaid losses and loss adjustment expenses attributable to acquisitions are recorded at fair value as of the acquisition date, which consists of the present value of the expected net loss and loss adjustment expense payments plus a risk premium. Unpaid losses and loss adjustment expenses included in the consolidated balance sheet include the unamortized portion of any fair value adjustments recorded in conjunction with an acquisition; however, as this amount does not represent case or IBNR reserves, it is excluded from the table below. See note 9 of the notes to consolidated financial statements and "Critical Accounting Estimates" for a discussion of estimates and assumptions related to unpaid losses and loss adjustment expenses.

(dollars in thousands)	U.S. Insurance		International Insurance		Reinsurance		Other Insurance (Discontinued Lines)		Consolidated
December 31, 2016
Case reserves	$	1,088,388	$	1,188,171	$	819,405	$	248,729	$	3,344,693
IBNR reserves	2,754,209		1,841,042		1,813,361		293,458		6,702,070
Total	$	3,842,597	$	3,029,213	$	2,632,766	$	542,187	$	10,046,763
December 31, 2015
Case reserves	$	1,092,677	$	1,242,138	$	942,891	$	319,988	$	3,597,694
IBNR reserves	2,617,871		1,855,666		1,768,396		321,277		6,563,210
Total	$	3,710,548	$	3,097,804	$	2,711,287	$	641,265	$	10,160,904

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The following table summarizes our contractual cash payment obligations at December 31, 2016.

	Payments Due by Period (1)
(dollars in thousands)	Total		Less than 1 year		1-3 years		4-5 years		More than 5 years
Senior long-term debt and other debt(2)	$	4,144,290	$	315,941	$	499,695	$	829,690	$	2,498,964
Unpaid losses and loss adjustment expenses (estimated)	10,046,763		1,863,378		3,123,560		1,981,494		3,078,331
Life and annuity benefits (estimated)	1,401,821		88,426		141,374		130,829		1,041,192
Operating leases	234,257		34,449		61,153		42,676		95,979
Total	$	15,827,131	$	2,302,194	$	3,825,782	$	2,984,689	$	6,714,466

⁽¹⁾  See notes 9, 10, 11 and 16 of the notes to consolidated financial statements for further discussion of these obligations.

⁽²⁾  Amounts include interest.

Senior long-term debt and other debt, excluding net unamortized premium and net unamortized debt issuance costs, was $2.6 billion at December 31, 2016 and $2.2 billion at December 31, 2015.

We maintain a revolving credit facility, which provides $300 million of capacity for future acquisitions, investments, repurchases of our capital stock and for general corporate purposes. At our discretion, $200 million of the total capacity may be used for secured letters of credit. We may increase the capacity of the facility to $500 million subject to certain terms and conditions. This facility expires in August 2019. As of December 31, 2016 and 2015, there were no borrowings outstanding under our revolving credit facility.

We were in compliance with all covenants contained in our revolving credit facility at December 31, 2016. To the extent that we are not in compliance with our covenants, our access to the revolving credit facility could be restricted. While we believe this to be unlikely, the inability to access the revolving credit facility could adversely affect our liquidity. See note 11 of the notes to consolidated financial statements for further discussion of our revolving credit facility.

Reserves for unpaid losses and loss adjustment expenses represent future contractual obligations associated with property and casualty insurance and reinsurance contracts issued to our policyholders or other insurance companies. Information presented in the table of contractual cash payment obligations is an estimate of our future payment of claims as of December 31, 2016. Payment patterns for losses and loss adjustment expenses were generally based upon historical claims patterns. Each claim is settled individually based upon its merits and certain claims may take years to settle, especially if legal action is involved. The actual cash payments for settled claims will vary, possibly significantly, from the estimates shown in the preceding table. The unpaid losses and loss adjustment expenses in the table above are our gross estimates of known liabilities as of December 31, 2016. The expected payments by period are the estimated payments at a future time, whereas the reserves for unpaid losses and loss adjustment expenses included in the consolidated balance sheet include the unamortized portion of any fair value adjustments for unpaid losses and loss adjustment expenses assumed in conjunction with an acquisition.

Reserves for life and annuity benefits represent future contractual obligations associated with reinsurance contracts issued to other insurance companies. Information presented in the table of contractual cash payment obligations is an estimate of our future payment of benefits as of December 31, 2016. The assumptions used in estimating the likely payments due by period are based on cedent experience, industry mortality tables, and our expense experience. Due to the inherent uncertainty in the process of estimating the timing of such payments, there is a risk that the amounts paid in any such period can be significantly different from the estimates shown in the preceding table. The life and annuity benefits in the above table are our gross estimates of known obligations as of December 31, 2016. These obligations are computed on a net present value basis in the consolidated balance sheet as of December 31, 2016, whereas the expected payments by period in the table above are the estimated payments at a future time and do not reflect a discount of the amount payable.

On February 1, 2017, we entered into a definitive merger agreement to acquire SureTec Financial Corp. (SureTec) for approximately $250 million. SureTec is a Texas-based privately held surety company primarily offering contract, commercial and court bonds. The transaction is subject to customary closing conditions, including insurance regulatory approvals, and is expected to close in the first half of 2017.

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At December 31, 2016, we had $4.1 billion of invested assets or other assets held in trust or on deposit for the benefit of policyholders or ceding companies or to support underwriting activities. Additionally, we have pledged investments and cash and cash equivalents totaling $355.6 million at December 31, 2016 as security for letters of credit that have been issued by various banks on our behalf. These invested assets and the related liabilities are included on our consolidated balance sheet. See note 3(h) of the notes to consolidated financial statements for further discussion of restrictions over our invested assets.

Our insurance operations require capital to support premium writings, and we remain committed to maintaining adequate capital and surplus at each of our insurance subsidiaries. The National Association of Insurance Commissioners (NAIC) developed a model law and risk-based capital formula designed to help regulators identify domestic property and casualty insurers that may be inadequately capitalized. Under the NAIC's requirements, a domestic insurer must maintain total capital and surplus above a calculated threshold or face varying levels of regulatory action. Capital adequacy of our foreign insurance subsidiaries is regulated by applicable laws of the United Kingdom, Bermuda and other jurisdictions. At December 31, 2016, the capital and surplus of each of our insurance subsidiaries significantly exceeded the amount of statutory capital and surplus necessary to satisfy regulatory requirements.

We have access to various capital sources, including dividends from certain of our insurance subsidiaries, holding company invested assets, undrawn capacity under our revolving credit facility and access to the debt and equity capital markets. We believe that we have sufficient liquidity to meet our capital needs.

Market Risk Disclosures

Market risk is the risk of economic losses due to adverse changes in the estimated fair value of a financial instrument as the result of changes in equity prices, interest rates, foreign currency exchange rates and commodity prices. Our consolidated balance sheets include assets and liabilities with estimated fair values that are subject to market risk. Our primary market risks have been equity price risk associated with investments in equity securities, interest rate risk associated with investments in fixed maturities and foreign currency exchange rate risk associated with our international operations. Various companies within our Markel Ventures operations are subject to commodity price risk; however, this risk is not material to the Company.

The estimated fair value of our investment portfolio at December 31, 2016 was $19.1 billion, 75% of which was invested in fixed maturities, short-term investments, cash and cash equivalents and restricted cash and cash equivalents and 25% of which was invested in equity securities. At December 31, 2015, the estimated fair value of our investment portfolio was $18.2 billion, 78% of which was invested in fixed maturities, short-term investments, cash and cash equivalents and restricted cash and cash equivalents and 22% of which was invested in equity securities.

Our fixed maturities, equity securities and short-term investments are recorded at fair value, which is measured based upon quoted prices in active markets, if available. We determine fair value for these investments after considering various sources of information, including information provided by a third party pricing service. The pricing service provides prices for substantially all of our fixed maturities and equity securities. In determining fair value, we generally do not adjust the prices obtained from the pricing service. We obtain an understanding of the pricing service's valuation methodologies and related inputs, which include, but are not limited to, reported trades, benchmark yields, issuer spreads, bids, offers, duration, credit ratings, estimated cash flows and prepayment speeds. We validate prices provided by the pricing service by reviewing prices from other pricing sources and analyzing pricing data in certain instances.

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Equity Price Risk

We invest a portion of shareholder funds in equity securities, which have historically produced higher long-term returns relative to fixed maturities. We seek to invest in profitable companies, with honest and talented management, that exhibit reinvestment opportunities and capital discipline, at reasonable prices. We intend to hold these investments over the long term and focus on long-term total investment return, understanding that the level of unrealized gains or losses on investments may vary from one period to the next. The changes in the estimated fair value of the equity portfolio are presented as a component of shareholders' equity in accumulated other comprehensive income, net of taxes. See note 3(a) of the notes to consolidated financial statements for disclosure of gross unrealized gains and losses by investment category.

At December 31, 2016, our equity portfolio was concentrated in terms of the number of issuers and industries. Such concentrations can lead to higher levels of price volatility. At December 31, 2016, our ten largest equity holdings represented $2.1 billion, or 44%, of the equity portfolio. Investments in the property and casualty insurance industry represented $1.0 billion, or 22%, of our equity portfolio at December 31, 2016. Our investments in the property and casualty insurance industry included a $511.3 million investment in the common stock of Berkshire Hathaway Inc., a company whose subsidiaries engage in a number of diverse business activities in addition to insurance. We have investment guidelines that set limits on the equity holdings of our insurance subsidiaries.

The following table summarizes our equity price risk and shows the effect of a hypothetical 35% increase or decrease in market prices as of December 31, 2016 and 2015. The selected hypothetical changes do not indicate what could be the potential best or worst case scenarios.

(dollars in millions)	Estimated Fair Value		Hypothetical Price Change	Estimated Fair Value after Hypothetical Change in Prices		Estimated Hypothetical Percentage Increase (Decrease) in Shareholders' Equity
As of December 31, 2016
Equity securities	$	4,746	35% increase	$	6,407	13.1	%
			35% decrease	3,085		(13.1	)
As of December 31, 2015
Equity securities	$	4,074	35% increase	$	5,501	12.1	%
			35% decrease	2,648		(12.1	)

Interest Rate Risk

Our fixed maturity investments and borrowings are subject to interest rate risk. Increases and decreases in interest rates typically result in decreases and increases, respectively, in the fair value of these financial instruments.

The majority of our investable assets come from premiums paid by policyholders. These funds are invested predominantly in high quality corporate, government and municipal bonds with relatively short durations. The fixed maturity portfolio, including short-term investments and cash and cash equivalents, has an average duration of 4.4 years and an average rating of "AA." See note 3(c) of the notes to consolidated financial statements for disclosure of contractual maturity dates of our fixed maturity portfolio. The changes in the estimated fair value of the fixed maturity portfolio are presented as a component of shareholders' equity in accumulated other comprehensive income, net of taxes.

We work to manage the impact of interest rate fluctuations on our fixed maturity portfolio. The effective duration of the fixed maturity portfolio is managed with consideration given to the estimated duration of our liabilities. We have investment guidelines that limit the maximum duration and maturity of the fixed maturity portfolio.

We use a commercially available model to estimate the effect of interest rate risk on the fair values of our fixed maturity portfolio and borrowings. The model estimates the impact of interest rate changes on a wide range of factors including duration, prepayment, put options and call options. Fair values are estimated based on the net present value of cash flows, using a representative set of possible future interest rate scenarios. The model requires that numerous assumptions be made about the future. To the extent that any of the assumptions are invalid, incorrect estimates could result. The usefulness of a single point-in-time model is limited, as it is unable to accurately incorporate the full complexity of market interactions.

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The following table summarizes our interest rate risk and shows the effect of hypothetical changes in interest rates as of December 31, 2016 and 2015. The selected hypothetical changes do not indicate what could be the potential best or worst case scenarios.

(dollars in millions)	Estimated Fair  Value		Hypothetical Change in Interest Rates (bp=basis points)	Estimated Fair  Value after Hypothetical Change in Interest Rates		Hypothetical Percentage Increase (Decrease) in
						Fair Value of Fixed Maturities		Shareholders' Equity
Fixed Maturity Investments
As of December 31, 2016
Total fixed maturity investments	$	9,892	200 bp decrease	$	11,252	13.8	%	10.8	%
			100 bp decrease	10,549		6.6		5.2
			100 bp  increase	9,264		(6.3	)	(5.0	)
			200 bp  increase	8,669		(12.4	)	(9.7	)
As of December 31, 2015
Total fixed maturity investments	$	9,394	200 bp decrease	$	10,591	12.7	%	10.1	%
			100 bp decrease	9,977		6.2		4.9
			100 bp  increase	8,832		(6.0	)	(4.8	)
			200 bp  increase	8,296		(11.7	)	(9.3	)
Liabilities (1)
As of December 31, 2016
Borrowings	$	2,721	200 bp decrease	$	3,184
			100 bp decrease	2,933
			100 bp  increase	2,540
			200 bp  increase	2,384
As of December 31, 2015
Borrowings	$	2,403	200 bp decrease	$	2,731
			100 bp decrease	2,557
			100 bp  increase	2,266
			200 bp  increase	2,143

⁽¹⁾  Changes in estimated fair value have no impact on shareholders' equity.

Foreign Currency Exchange Rate Risk

We have foreign currency exchange rate risk associated with certain of our assets and liabilities. We manage this risk primarily by matching assets and liabilities in each foreign currency, other than non-monetary assets and liabilities, as closely as possible. Non-monetary assets primarily consist of goodwill and intangible assets. As of December 31, 2016 and 2015, the carrying value of goodwill and intangible assets denominated in a foreign currency, which is not matched or hedged, was $208.7 million and $241.2 million, respectively. The decrease is primarily due to the strengthening of the U.S. dollar against the United Kingdom Sterling during 2016.

To assist with the matching of assets and liabilities in foreign currencies, we periodically purchase foreign currency forward contracts and we purchase or sell foreign currencies in the open market. Our forward contracts are generally designated as specific hedges for financial reporting purposes. As such, realized and unrealized gains and losses on these hedges are recorded as currency translation adjustments and are part of other comprehensive income (loss). Our forward contracts generally have maturities of three months. At December 31, 2016 and 2015, substantially all of our monetary assets and liabilities denominated in foreign currencies were either matched or hedged.

At December 31, 2016 and 2015, approximately 88% and 87%, respectively, of our invested assets were denominated in United States Dollars. At December 31, 2016 and 2015, approximately 81% and 80%, respectively, of our reserves for unpaid losses and loss adjustment expenses and life and annuity benefits were denominated in United States Dollars. At those dates, the largest foreign currency denominated balances within both our invested assets and reserves for unpaid losses and loss adjustment expenses and life and annuity benefits were the Euro and United Kingdom Sterling.

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Credit Risk

Credit risk is the potential loss resulting from adverse changes in an issuer's ability to repay its debt obligations. We monitor our investment portfolio to ensure that credit risk does not exceed prudent levels. We have consistently invested in high credit quality, investment grade securities. Our fixed maturity portfolio has an average rating of "AA," with approximately 98% rated "A" or better by at least one nationally recognized rating organization. Our policy is to invest in investment grade securities and to minimize investments in fixed maturities that are unrated or rated below investment grade. At December 31, 2016, less than 1% of our fixed maturity portfolio was unrated or rated below investment grade. Our fixed maturity portfolio includes securities issued with financial guaranty insurance. We purchase fixed maturities based on our assessment of the credit quality of the underlying assets without regard to insurance.

Our fixed maturity portfolio includes securities issued by foreign governments and non-sovereign foreign institutions. General concern exists about the financial difficulties facing certain foreign countries in light of the adverse economic conditions experienced over the past several years. We monitor developments in foreign countries, currencies and issuers that could pose risks to our fixed maturity portfolio, including ratings downgrades, political and financial changes and the widening of credit spreads. We believe that our fixed maturity portfolio is highly diversified and is comprised of high quality securities.

We obtain information from news services, rating agencies and various financial market participants to assess potential negative impacts on a country or company's financial risk profile. We analyze concentrations within our fixed maturity portfolio by country, currency and issuer, which allows us to assess our level of diversification with respect to these exposures, reduce troubled exposures should they occur and mitigate any future financial distress that these exposures could cause. The following tables present the estimated fair values of foreign exposures included in our fixed maturity portfolio.

	December 31, 2016
(dollars in thousands)	Sovereign		Non-Sovereign Financial Institutions		Non-Sovereign Non-Financial Institutions		Total
European exposures:
Portugal, Ireland, Italy, Greece and Spain	$	—	$	5,100	$	2,138	$	7,238
Eurozone (excluding Portugal, Ireland, Italy, Greece and Spain)	779,206		175,104		49,788		1,004,098
Supranationals	—		184,139		—		184,139
Other	153,561		109,334		63,270		326,165
Total European exposures	932,767		473,677		115,196		1,521,640
Brazil	30,722		—		—		30,722
All other foreign exposures	499,973		77,171		73,108		650,252
Total foreign exposures	$	1,463,462	$	550,848	$	188,304	$	2,202,614

	December 31, 2015
(dollars in thousands)	Sovereign		Non-Sovereign Financial Institutions		Non-Sovereign Non-Financial Institutions		Total
European exposures:
Portugal, Ireland, Italy, Greece and Spain	$	—	$	5,291	$	2,161	$	7,452
Eurozone (excluding Portugal, Ireland, Italy, Greece and Spain)	803,560		205,233		94,387		1,103,180
Supranationals	—		208,660		—		208,660
Other	120,072		139,882		90,517		350,471
Total European exposures	923,632		559,066		187,065		1,669,763
Brazil	22,298		—		—		22,298
All other foreign exposures	470,527		98,191		91,407		660,125
Total foreign exposures	$	1,416,457	$	657,257	$	278,472	$	2,352,186

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General concern also exists about municipalities that experience financial difficulties during periods of adverse economic conditions. We manage the exposure to credit risk in our municipal bond portfolio by investing in high quality securities and by diversifying our holdings, which are typically either general obligation or revenue bonds related to essential products and services.

Impact of Inflation

Property and casualty insurance premiums are established before the amount of losses and loss adjustment expenses, or the extent to which inflation may affect such expenses, is known. Consequently, in establishing premiums, we attempt to anticipate the potential impact of inflation. We also consider inflation in the determination and review of reserves for losses and loss adjustment expenses and life and annuity benefits since portions of these reserves are expected to be paid over extended periods of time. This is especially true for our long-tailed lines of business. Although our life and annuity reinsurance business is in run-off, we must monitor the effects inflation and changing interest rates have on the related reserves. We regularly complete loss recognition testing to ensure that held reserves are sufficient to meet our future claim obligations in the current investment environment.

Disclosure of Certain Activities Relating to Iran

Under the Iran Threat Reduction and Syria Human Rights Act of 2012, non-U.S. entities owned or controlled by U.S. persons have been prohibited from engaging in activities, transactions or dealings with Iran to the same extent as U.S. persons. Effective January 16, 2016, the Office of Foreign Assets Control of the U.S. Department of the Treasury adopted General License H, which authorizes non-U.S. entities that are owned or controlled by a U.S. person to engage in most activities with Iran permitted for other non-U.S. entities so long as they meet certain requirements.

Section 13(r) of the Securities Exchange Act of 1934 requires reporting of certain Iran-related activities that are now permitted under General License H, including underwriting, insuring and reinsuring certain activities related to the importation of refined petroleum products by Iran and vessels involved in the transportation of crude oil from Iran.

Certain of our non-U.S. insurance operations underwrite global marine hull policies and global marine hull war policies that provide coverage for vessels or fleets navigating into and out of ports worldwide, potentially including Iran. Under a global marine hull war policy, the insured is required to give notice before entering designated areas, including Iran. During the quarter ended December 31, 2016 we have received notice(s) that one or more vessels covered by a global marine hull war policy were entering Iranian waters. However, no additional premium is required under global marine hull policies or global marine hull war policies for calling into Iran. During the quarter ended December 31, 2016, we have not been asked to cover a specific voyage into or out of Iran that would result in a separate, allocable premium for that voyage.

Certain of our non-U.S. reinsurance operations underwrite marine, energy, aviation and trade credit treaties on a worldwide basis and, as a result, it is possible that the underlying insurance portfolios may have exposure to the Iranian petroleum industry and its related products and service providers.

We provide two energy construction reinsurance contracts in Iran through our syndicate at Lloyd's. We expect our portion of the premium for both contracts to be approximately $2 million in the aggregate. Except for these two contracts, we are not aware of any premium apportionment with respect to underwriting, insurance or reinsurance activities of our non-U.S. insurance subsidiaries reportable under Section 13(r). Should any such risks have entered into the stream of commerce covered by the insurance portfolios underlying our reinsurance treaties, we believe that the premiums associated with such business would be immaterial.

Our non-U.S. insurance subsidiaries intend to continue to provide insurance and reinsurance for coverage of Iran-related risks, if at all, only to the extent permitted under, and in accordance with, General License H or other applicable economic or trade sanctions requirements or licenses.

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Controls and Procedures

As of December 31, 2016, we carried out an evaluation of the effectiveness of the design and operation of our disclosure controls and procedures pursuant to Securities Exchange Act Rule 13a-15 (Disclosure Controls). This evaluation was conducted under the supervision and with the participation of our management, including the Principal Executive Officer (PEO) and the Principal Financial Officer (PFO).

Our management, including the PEO and PFO, does not expect that our Disclosure Controls will prevent all error and all fraud. A control system, no matter how well conceived and operated, can provide only reasonable, not absolute, assurance that the objectives of the control system are met. Further, the design of a control system must reflect the fact that there are resource constraints, and the benefits of controls must be considered relative to their costs. Because of the inherent limitations in all control systems, no evaluation of controls can provide absolute assurance that all control issues and instances of fraud, if any, have been detected. These inherent limitations include the realities that judgments in decision making can be faulty, and that breakdowns can occur because of simple error or mistake. The design of any system of controls also is based in part upon certain assumptions about the likelihood of future events, and there can be no assurance that any design will succeed in achieving its stated goals under all potential future conditions.

Based upon our controls evaluation, the PEO and PFO concluded that effective Disclosure Controls were in place to ensure that the information required to be disclosed in reports we file or submit under the Securities Exchange Act of 1934 is recorded, processed, summarized and reported within the time periods specified in the Securities and Exchange Commission's rules and forms.

Pursuant to Section 404 of the Sarbanes-Oxley Act of 2002, we carried out an evaluation, under the supervision and with the participation of our management, including the PEO and the PFO, of the effectiveness of our internal control over financial reporting as of December 31, 2016. See Management's Report on Internal Control over Financial Reporting and our independent registered public accounting firm's attestation report on the effectiveness of our internal control over financial reporting.

There were no changes in our internal control over financial reporting during the fourth quarter of 2016 that materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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Safe Harbor and Cautionary Statement

This report contains statements concerning or incorporating our expectations, assumptions, plans, objectives, future financial or operating performance and other statements that are not historical facts. These statements are "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995. Such statements may use words such as "anticipate," "believe," "estimate," "expect," "intend," "predict," "project" and similar expressions as they relate to us or our management.

There are risks and uncertainties that may cause actual results to differ materially from predicted results in forward-looking statements. Factors that may cause actual results to differ are often presented with the forward-looking statements themselves. Additional factors that could cause actual results to differ from those predicted are set forth under "Risk Factors" or are included in the items listed below:

• our anticipated premium volume is based on current knowledge and assumes no significant man-made or natural catastrophes, no significant changes in products or personnel and no adverse changes in market conditions;

• the effect of cyclical trends, including demand and pricing in the insurance and reinsurance markets;

• actions by competitors, including the application of new or "disruptive" technologies or business models and consolidation, and the effect of competition on market trends and pricing;

• we offer insurance and reinsurance coverage against terrorist acts in connection with some of our programs, and in other instances we are legally required to offer terrorism insurance; in both circumstances, we actively manage our exposure, but if there is a covered terrorist attack, we could sustain material losses;

• the frequency and severity of man-made and natural catastrophes (including earthquakes and weather-related catastrophes) may exceed expectations, are unpredictable and, in the case of weather-related catastrophes, may be exacerbated if, as many forecast, conditions in the oceans and atmosphere result in increased hurricane, flood, drought or other adverse weather-related activity;

• emerging claim and coverage issues, changing legal and social trends, and inherent uncertainties in the loss estimation process can adversely impact the adequacy of our loss reserves and our allowance for reinsurance recoverables;

• reinsurance reserves are subject to greater uncertainty than insurance reserves, primarily because of reliance upon the original underwriting decisions made by ceding companies and the longer lapse of time from the occurrence of loss events to their reporting to the reinsurer for ultimate resolution;

• changes in the assumptions and estimates used in establishing reserves for our life and annuity reinsurance book (which is in runoff), for example, changes in assumptions and estimates of mortality, longevity, morbidity and interest rates, could result in material increases in our estimated loss reserves for such business;

• adverse developments in insurance coverage litigation or other legal or administrative proceedings could result in material increases in our estimates of loss reserves;

• the failure or inadequacy of any loss limitation methods we employ;

• changes in the availability, costs and quality of reinsurance coverage, which may impact our ability to write or continue to write certain lines of business;

• industry and economic conditions, deterioration in reinsurer credit quality and coverage disputes can affect the ability or willingness of reinsurers to pay balances due;

• after the commutation of ceded reinsurance contracts, any subsequent adverse development in the re-assumed loss reserves will result in a charge to earnings;

• regulatory actions can impede our ability to charge adequate rates and efficiently allocate capital;

• general economic and market conditions and industry specific conditions, including extended economic recessions or expansions; prolonged periods of slow economic growth; inflation or deflation; fluctuations in foreign currency exchange rates, commodity and energy prices and interest rates; volatility in the credit and capital markets; and other factors;

• economic conditions, actual or potential defaults in municipal bonds or sovereign debt obligations, volatility in interest and foreign currency exchange rates and changes in market value of concentrated investments can have a significant impact on the fair value of our fixed maturity and equity securities, as well as the carrying value of our other assets and liabilities, and this impact may be heightened by market volatility;

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• economic conditions may adversely affect our access to capital and credit markets;

• the effects of government intervention, including material changes in the monetary policies of central banks, to address financial downturns and economic and currency concerns;

• the impacts that political and civil unrest and regional conflicts may have on our businesses and the markets they serve or that any disruptions in regional or worldwide economic conditions generally arising from these situations may have on our businesses, industries or investments;

• the impacts that health epidemics and pandemics may have on our business operations and claims activity;

• the impact on our businesses of the repeal, in part or in whole, or modification of U.S. health care reform legislation and regulations;

• changes in U.S. tax laws or in the tax laws of other jurisdictions in which we operate;

• we are dependent upon operational effectiveness and security of our enterprise information technology systems and those maintained by third parties; if one or more of those systems fail or suffer a security breach, our businesses or reputation could be adversely impacted;

• our acquisition of insurance and non-insurance businesses may increase our operational and control risks for a period of time;

• we may not realize the contemplated benefits, including cost savings and synergies, of our acquisitions;

• any determination requiring the write-off of a significant portion of our goodwill and intangible assets;

• the loss of services of any executive officer or other key personnel could adversely impact one or more of our operations;

• our substantial international operations and investments expose us to increased political, operational and economic risks, including foreign currency exchange rate and credit risk;

• the vote by the United Kingdom to leave the European Union, which could have adverse consequences for our businesses, particularly our London-based international insurance operations;

• our ability to raise third party capital for existing or new investment vehicles and risks related to our management of third party capital;

• the effectiveness of our procedures for compliance with existing and ever increasing guidelines, policies and legal and regulatory standards, rules, laws and regulations;

• the impact of economic and trade sanctions and embargo programs on our businesses, including instances in which the requirements and limitations applicable to the global operations of U.S. companies and their affiliates are more restrictive than those applicable to non-U.S. companies and their affiliates;

• a number of additional factors may adversely affect our Markel Ventures operations, and the markets they serve, and negatively impact their revenues and profitability, including, among others: changes in government support for education, healthcare and infrastructure projects; changes in capital spending levels; changes in the housing market; and volatility in commodity prices and interest and foreign currency exchange rates; and

• adverse changes in our assigned financial strength or debt ratings could adversely impact us, including our ability to attract and retain business and the availability and cost of capital.

Our premium volume, underwriting and investment results and results from our non-insurance operations have been and will continue to be potentially materially affected by these factors. By making forward-looking statements, we do not intend to become obligated to publicly update or revise any such statements whether as a result of new information, future events or other changes. Readers are cautioned not to place undue reliance on any forward-looking statements, which speak only as at their dates.

137

OTHER INFORMATION

Performance Graph

The following graph compares the cumulative total return (based on share price) on our common stock with the cumulative total return of companies included in the S&P 500 Index and the Dow Jones Property & Casualty Insurance Companies Index. This information is not necessarily indicative of future results.

	Years Ended December 31,
	2011 (1)		2012		2013		2014		2015		2016
Markel Corporation	$	100	$	105	$	140	$	165	$	213	$	218
S&P 500	100		116		154		175		177		198
Dow Jones Property & Casualty Insurance	100		119		158		177		193		226

⁽¹⁾  $100 invested on December 31, 2011 in our common stock or the listed index. Includes reinvestment of dividends.

Market and Dividend Information

Our common stock trades on the New York Stock Exchange under the symbol MKL. The number of shareholders of record as of February 6, 2017 was approximately 350. The total number of shareholders, including those holding shares in street name or in brokerage accounts, is estimated to be in excess of 100,000. Our current strategy is to retain earnings and, consequently, we have not paid and do not expect to pay a cash dividend on our common stock.

High and low common stock prices as reported on the New York Stock Exchange composite tape for 2016 were $989.18 and $805.03, respectively. See note 24 of the notes to consolidated financial statements for additional common stock price information.

138

Common Stock Repurchases

The following table summarizes our common stock repurchases for the quarter ended December 31, 2016.

Issuer Purchases of Equity Securities

	(a)	(b)		(c)	(d)
Period	Total Number of Shares Purchased	Average Price Paid per Share		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs(1)	Approximate Dollar Value of Shares that May Yet Be Purchased Under the Plans or Programs (in thousands)
October 1, 2016 through October 31, 2016	—	—		—	$	262,948
November 1, 2016 through November 30, 2016	39,890	$	844.43	39,890	$	229,263
December 1, 2016 through December 31, 2016	—	—		—	$	229,263
Total	39,890	$	844.43	39,890	$	229,263

⁽¹⁾  The Board of Directors approved the repurchase of up to $300 million of our common stock pursuant to a share repurchase program publicly announced on November 21, 2013 (the Program). Under the Program, we may repurchase outstanding shares of our common stock from time to time, primarily through open-market transactions. The Program has no expiration date but may be terminated by the Board of Directors at any time.

Available Information and Shareholder Relations

This document represents Markel Corporation's Annual Report and Form 10-K, which is filed with the Securities and Exchange Commission.

Information about Markel Corporation, including exhibits filed as part of this Form 10-K, may be obtained by writing Mr. Bruce Kay, Investor Relations, at the address of the corporate offices listed below, or by calling (800) 446-6671.

We make available free of charge on or through our website our annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K and all amendments to those reports as soon as reasonably practicable after such material is electronically filed with or furnished to the Securities and Exchange Commission. Our website address is www.markelcorp.com.

Transfer Agent

American Stock Transfer & Trust Co., LLC, Operations Center, 6201 15th Avenue, Brooklyn, NY 11219

(800) 937-5449 (718) 921-8124

Code of Conduct

We have adopted a code of business conduct and ethics (Code of Conduct) which is applicable to all directors and associates, including executive officers. We have posted the Code of Conduct on our website at www.markelcorp.com. We intend to satisfy applicable disclosure requirements regarding amendments to, or waivers from, provisions of our Code of Conduct by posting such information on our website. Shareholders may obtain printed copies of the Code of Conduct by writing Mr. Bruce Kay, Investor Relations, at the address of the corporate offices listed below, or by calling (800) 446-6671.

139

Annual Shareholders' Meeting

Shareholders of Markel Corporation are invited to attend the Annual Meeting to be held at Altria Theater, 6 North Laurel Street, Richmond, Virginia at 4:30 p.m., May 15, 2017.

Corporate Offices

Markel Corporation, 4521 Highwoods Parkway, Glen Allen, Virginia 23060-6148

(804) 747-0136 (800) 446-6671

140

Executive Officers

Alan I. Kirshner

Executive Chairman since January 2016. Chairman of the Board since 1986. Chief Executive Officer from 1986 to December 2015. Director since 1978. Age 81.

Anthony F. Markel

Vice Chairman of Markel Corporation and the Board since May 2008. President and Chief Operating Officer from March 1992 to May 2008. Director since 1978. Age 75.

Steven A. Markel

Vice Chairman of Markel Corporation and the Board since March 1992. Director since 1978. Age 68.

Thomas S. Gayner

Co-Chief Executive Officer since January 2016. President and Chief Investment Officer from May 2010 to December 2015. Chief Investment Officer from January 2001 to December 2015. President, Markel-Gayner Asset Management Corporation, a subsidiary, since December 1990. Director from 1998 to 2004. Director since August 2016. Age 55.

Richard R. Whitt, III

Co-Chief Executive Officer since January 2016. President and Co-Chief Operating Officer from May 2010 to December 2015. Senior Vice President and Chief Financial Officer from May 2005 to May 2010. Director since August 2016. Age 53.

F. Michael Crowley

Vice Chairman of Markel Corporation since August 2016. President from May 2010 to August 2016. Co-Chief Operating Officer from May 2010 to December 2015. President, Markel Specialty from February 2009 to May 2010. President of Willis HRH North America from October 2008 to January 2009. President of Hilb Rogal & Hobbs Company from September 2005 to October 2008. Age 65.

Britton L. Glisson

President, Global Insurance since November 2014 and Chief Administrative Officer since February 2009. President, Markel Insurance Company, a subsidiary, from October 1996 to March 2009. Age 60.

Bradley J. Kiscaden

Executive Vice President and Chief Actuarial Officer since July 2012. Chief Actuarial Officer since March 1999. Age 54.

Anne G. Waleski

Executive Vice President and Chief Financial Officer since May 2014. Vice President and Chief Financial Officer since May 2010. Treasurer from August 2003 to November 2011. Age 50.

141

EXHIBIT INDEX

Exhibit No.	Document Description
3(i)	Amended and Restated Articles of Incorporation (incorporated by reference from Exhibit 3.1 in the Registrant's report on Form 8-K filed with the Commission May 13, 2011)
3(ii)	Bylaws, as amended (incorporated by reference from Exhibit 3.1 in the Registrant's report on Form 8-K filed with the Commission November 20, 2015)
4.1	Indenture dated as of June 5, 2001 between Markel Corporation and The Chase Manhattan Bank, as Trustee (incorporated by reference from Exhibit 4.1 in the Registrant's report on Form 8-K filed with the Commission June 5, 2001)
4.2	Form of Third Supplemental Indenture dated as of August 13, 2004 between Markel Corporation and JPMorgan Chase Bank (formerly known as The Chase Manhattan Bank), as Trustee, including form of the securities as Exhibit A (incorporated by reference from Exhibit 4.2 in the Registrant's report on Form 8-K filed with the Commission August 11, 2004)
4.3	Form of Fifth Supplemental Indenture dated as of September 22, 2009 between Markel Corporation and The Bank of New York Mellon (as successor to The Chase Manhattan Bank), as Trustee, including form of the securities as Exhibit A (incorporated by reference from Exhibit 4.2 in the Registrant's report on Form 8-K filed with the Commission September 21, 2009)
4.4	Form of Sixth Supplemental Indenture dated as of June 1, 2011 between Markel Corporation and The Bank of New York Mellon (as successor to The Chase Manhattan Bank), as Trustee, including form of the securities as Exhibit A (incorporated by reference from Exhibit 4.2 in the Registrant's report on Form 8-K filed with the Commission May 31, 2011)
4.5	Form of Seventh Supplemental Indenture dated as of July 2, 2012 between Markel Corporation and The Bank of New York Mellon (as successor to The Chase Manhattan Bank), as Trustee, including form of the securities as Exhibit A (incorporated by reference from Exhibit 4.2 in the Registrant's report on Form 8-K filed with the Commission June 29, 2012)
4.6	Form of Eighth Supplemental Indenture dated as of March 8, 2013 between Markel Corporation and The Bank of New York Mellon (as successor to The Chase Manhattan Bank), as Trustee, including form of the securities as Exhibit A (incorporated by reference from Exhibit 4.2 in the Registrant's report on Form 8-K filed with the Commission March 7, 2013)
4.7	Form of Ninth Supplemental Indenture dated as of March 8, 2013 between Markel Corporation and The Bank of New York Mellon (as successor to The Chase Manhattan Bank), as Trustee, including form of the securities as Exhibit A (incorporated by reference from Exhibit 4.3 in the Registrant's report on Form 8-K filed with the Commission March 7, 2013)
4.8	Form of Tenth Supplemental Indenture dated as of April 5, 2016 between Markel Corporation and The Bank of New York Mellon (as successor to The Chase Manhattan Bank), as Trustee, including form of the securities as Exhibit A (incorporated by reference from Exhibit 4.2 in the Registrant's report on Form 8-K filed with the Commission March 31, 2016)
4.9	Indenture dated as of September 1, 2010, among Alterra Finance LLC, Alterra Capital Holdings Limited and The Bank of New York Mellon, as Trustee (incorporated by reference from Exhibit 4.14 in the Registrant's report on Form 10-Q filed with the Commission for the quarter ended June 30, 2013)
4.10	First Supplemental Indenture, dated as of September 27, 2010 between Alterra Finance LLC, Alterra Capital Holdings Limited and The Bank of New York Mellon, as Trustee, including the form of the securities as Exhibit A (incorporated by reference from Exhibit 4.15 in the Registrant's report on Form 10-Q filed with the Commission for the quarter ended June 30, 2013)
4.11	Form of Second Supplemental Indenture dated as of June 30, 2014 among Alterra Finance LLC, Alterra Capital Holdings Limited and the Bank of New York Mellon, as Trustee ( incorporated by reference from Exhibit 4.16 in the Registrant's report on Form 10-Q filed with the Commission for the quarter ended June 30, 2014)
4.12	Form of Guaranty Agreement by Markel Corporation dated as of June 30, 2014 in connection with the Alterra Finance LLC 6.25% Senior Notes due 2020 (incorporated by reference from Exhibit 4.17 in the Registrant's report on Form 10-Q filed with the Commission for the quarter ended June 30, 2014)

The registrant hereby agrees to furnish to the Securities and Exchange Commission, upon request, a copy of all other instruments defining the rights of holders of long-term debt of the registrant and its subsidiaries.

142

Exhibit No.	Document Description
10.1	Form of Credit Agreement dated as of August 1, 2014 among Markel Corporation, Markel Bermuda Limited, Alterra Reinsurance USA Inc., Alterra Finance LLC, Alterra USA Holdings Limited, the lenders party from time to time thereto, and Wells Fargo Bank, National Association, Administrative Agent, a Fronting Bank and Swingline Lender ("Wells Fargo Credit Agreement") (incorporated by reference from Exhibit 4.1 in the Registrant's report on Form 10-Q filed with the Commission for the quarter ended June 30, 2014)
10.2	First Amendment to Credit Agreement dated as of November 13, 2015, to the Wells Fargo Credit Agreement (incorporated by reference from Exhibit 10.2 in the Registrant's report on Form 10-K filed with the Commission for the year ended December 31, 2015)
10.3	Form of Amended and Restated Employment Agreement with Alan I. Kirshner (incorporated by reference from Exhibit 10.2 in the Registrant's report on Form 10-K filed with the Commission for the year ended December 31, 2008)*
10.4	Amended and Restated Employment Agreement with Steven A. Markel (incorporated by reference from Exhibit 10.1 in the Registrant's report on Form 10-Q filed with the Commission for the quarter ended September 30, 2015)*
10.5	Form of Amended and Restated Employment Agreement with Anthony F. Markel (incorporated by reference from Exhibit 10.4 in the Registrant's report on Form 10-K filed with the Commission for the year ended December 31, 2008)*
10.6	Form of Executive Employment Agreement with Thomas S. Gayner, Richard R. Whitt, III, F. Michael Crowley, Britton L. Glisson, Anne G. Waleski and Bradley J. Kiscaden (incorporated by reference from Exhibit 10.5 in the Registrant's report on Form 10-K filed with the Commission for the year ended December 31, 2008)*
10.7	Markel Corporation Executive Bonus Plan (incorporated by reference from Exhibit 10.1 in the Registrant's report on Form 8-K filed with the Commission May 14, 2015)*
10.8	Markel Corporation Voluntary Deferred Compensation Plan (incorporated by reference from Exhibit 10.14 in the Registrant's report on Form 10-K filed with the Commission for the year ended December 31, 2015)*
10.9	Employee Stock Purchase and Bonus Plan (incorporated by reference from Exhibit 10.9 in the Registrant's report on Form 10-K filed with the Commission for the year ended December 31, 2008)*
10.10	2016 Employee Stock Purchase and Bonus Plan (incorporated by reference from Exhibit 10.2 in the Registrant's report on Form 8-K filed with the Commission May 19, 2016)*
10.11	Markel Corporation Omnibus Incentive Plan (incorporated by reference from Appendix B in the Registrant's Proxy Statement and Definitive 14A filed with the Commission April 2, 2003)*
10.12	Form of Restricted Stock Unit Award Agreement for Executive Officers (revised 2010) (incorporated by reference from Exhibit 10.2 filed with the Commission in the Registrant's report on Form 10-Q for the quarter ended March 31, 2010)
10.13	Form of Amended and Restated May 2010 Restricted Stock Unit Award Agreement for Executive Officers (incorporated by reference from Exhibit 10.1 in the Registrant's report on Form 10-Q filed with the Commission for the quarter ended June 30, 2010)*
10.14	May 2010 Restricted Stock Units Deferral Election Form (incorporated by reference from Exhibit 10.2 in the Registrant's report on Form 10-Q filed with the Commission for the quarter ended June 30, 2010)*
10.15	Markel Corporation 2012 Equity Incentive Compensation Plan (incorporated by reference from Appendix A in the Registrant's Proxy Statement and Definitive 14A filed with the Commission March 16, 2012)*
10.16	Form of Time Based Restricted Stock Unit Award Agreement for Executive Officers for the 2012 Equity Incentive Compensation Plan (incorporated by reference from Exhibit 10.22 in the Registrant's report on Form 10-K filed with the Commission for the year ended December 31, 2012)*
10.17	Form of Performance Based Restricted Stock Unit Award Agreement for Executive Officers for the 2012 Equity Incentive Compensation Plan (incorporated by reference from Exhibit 10.23 in the Registrant's report on Form 10-K filed with the Commission for the year ended December 31, 2012)*
10.18	Restricted Stock Units Deferral Election Form for the 2012 Equity Incentive Compensation Plan (incorporated by reference from Exhibit 10.24 in the Registrant's report on Form 10-K filed with the Commission for the year ended December 31, 2012)*
10.19	Form of Restricted Stock Unit Award Agreement for Executive Officers under the Markel Corporation 2012 Equity Incentive Compensation Plan (incorporated by reference from Exhibit 10.1 in the Registrant's report on Form 8-K filed with the Commission May 17, 2013)*

143

10.20	Form of Performance Based Restricted Stock Unit Award Agreement for Executive Officers for the 2012 Equity Incentive Compensation Plan (revised 2016) (incorporated by reference from Exhibit 10.1 in the Registrant's report on Form 10-Q filed with the Commission for the quarter ended March 31, 2016)*
10.21	Form of Time Based (Cliff Vesting) Restricted Stock Unit Award Agreement for Executive Officers for the 2012 Equity Incentive Compensation Plan (revised 2016) (incorporated by reference from Exhibit 10.2 in the Registrant's report on Form 10-Q filed with the Commission for the quarter ended March 31, 2016)*
10.22	Form of Time Based (Graded Vesting) Restricted Stock Unit Award Agreement for Executive Officers for the 2012 Equity Incentive Compensation Plan (revised 2016) (incorporated by reference from Exhibit 10.3 in the Registrant's report on Form 10-Q filed with the Commission for the quarter ended March 31, 2016)*
10.23	2016 Equity Incentive Compensation Plan (incorporated by reference from Exhibit 10.1 in the Registrant's report on Form 8-K filed with the Commission May 19, 2016)*
10.24	Form of Performance Based Restricted Stock Unit Award Agreement for Executive Officers for the 2016 Equity Incentive Compensation Plan (incorporated by reference from Exhibit 10.3 in the Registrant's report on Form 10-Q filed with the Commission for the quarter ended June 30, 2016)*
10.25	Form of Time Based (Cliff Vesting) Restricted Stock Unit Award Agreement for Executive Officers for the 2016 Equity Incentive Compensation Plan (incorporated by reference from Exhibit 10.4 in the Registrant's report on Form 10-Q filed with the Commission for the quarter ended June 30, 2016)*
10.26	Form of Time Based (Graded Vesting) Restricted Stock Unit Award Agreement for Executive Officers for the 2016 Equity Incentive Compensation Plan (incorporated by reference from Exhibit 10.5 in the Registrant's report on Form 10-Q filed with the Commission for the quarter ended June 30, 2016)*
10.27	Form of Restricted Stock Award Agreement for Outside Directors for the 2016 Equity Incentive Compensation Plan (incorporated by reference from Exhibit 10.6 in the Registrant's report on Form 10-Q filed with the Commission for the quarter ended June 30, 2016)*
10.28	Aspen Holdings, Inc. Amended and Restated 2008 Stock Option Plan (incorporated by reference from Exhibit 99.1 in the Registrant's Registration Statement on Form S-8 (Reg. No. 333-170047))*
10.29	Alterra Capital Holdings Limited 2008 Stock Incentive Plan (incorporated by reference from Exhibit 99.1 in the Registrant's Registration Statement on Form S-8 (Reg. No. 333-188294))*
10.30	Alterra Capital Holdings Limited 2006 Equity Incentive Plan (incorporated by reference from Exhibit 99.2 in the Registrant's Registration Statement on Form S-8 (Reg. No. 333-188294))*
10.31	Alterra Capital Holdings Limited 2000 Stock Incentive Plan (incorporated by reference from Exhibit 99.3 in the Registrant's Registration Statement on Form S-8 (Reg. No. 333-188294))*
21	Certain Subsidiaries of Markel Corporation**
23	Consent of KPMG LLP**
31.1	Certification of Principal Executive Officer Pursuant to Rule 13a-14(a)/ 15d-14(a)**
31.2	Certification of Principal Financial Officer Pursuant to Rule 13a-14(a)/ 15d-14(a)**
32.1	Certification of Principal Executive Officer furnished Pursuant to 18 U.S.C. Section 1350**
32.2	Certification of Principal Financial Officer furnished Pursuant to 18 U.S.C. Section 1350**
101	The following consolidated financial statements from Markel Corporation's Annual Report on Form 10-K for the year ended December 31, 2016, filed on February 24, 2017, formatted in XBRL: (i) Consolidated Balance Sheets, (ii) Consolidated Statements of Income and Comprehensive Income, (iii) Consolidated Statements of Changes in Equity, (iv) Consolidated Statements of Cash Flows and (v) Notes to Consolidated Financial Statements.**

*    Indicates management contract or compensatory plan or arrangement

**    Filed with this report

144

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

MARKEL CORPORATION
/s/ Alan I. Kirshner	/s/ Anne G. Waleski
Alan I. Kirshner	Anne G. Waleski
Executive Chairman	Executive Vice President and Chief Financial Officer
(Principal Executive Officer)	(Principal Financial Officer)
February 24, 2017	February 24, 2017

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

Signatures	Title	Date
/s/ Alan I. Kirshner	Executive Chairman, Chairman of the Board	February 24, 2017
Alan I. Kirshner	(Principal Executive Officer)
/s/ Anthony F. Markel	Director, Vice Chairman	February 24, 2017
Anthony F. Markel
/s/ Steven A. Markel	Director, Vice Chairman	February 24, 2017
Steven A. Markel
/s/ Anne G. Waleski	Executive Vice President and Chief Financial Officer	February 24, 2017
Anne G. Waleski	(Principal Financial Officer)
/s/ Nora N. Crouch	Chief Accounting Officer	February 24, 2017
Nora N. Crouch	(Principal Accounting Officer)
/s/ J. Alfred Broaddus, Jr.	Director	February 24, 2017
J. Alfred Broaddus, Jr.
/s/ K. Bruce Connell	Director	February 24, 2017
K. Bruce Connell
/s/ Douglas C. Eby	Director	February 24, 2017
Douglas C. Eby
/s/ Thomas S. Gayner	Director	February 24, 2017
Thomas S. Gayner
/s/ Stewart M. Kasen	Director	February 24, 2017
Stewart M. Kasen
/s/ Lemuel E. Lewis	Director	February 24, 2017
Lemuel E. Lewis
/s/ Darrell D. Martin	Director	February 24, 2017
Darrell D. Martin
/s/ Michael O'Reilly	Director	February 24, 2017
Michael O'Reilly
/s/ Michael J. Schewel	Director	February 24, 2017
Michael J. Schewel
/s/ Jay M. Weinberg	Director	February 24, 2017
Jay M. Weinberg
/s/ Richard R. Whitt, III	Director	February 24, 2017
Richard R. Whitt, III
/s/ Debora J. Wilson	Director	February 24, 2017
Debora J. Wilson

145

EX-21

Exhibit 21

CERTAIN SUBSIDIARIES OF MARKEL CORPORATION

Subsidiary	State or Other Jurisdiction of Incorporation or Organization
Essentia Insurance Company	Missouri
Markel Insurance Company	Illinois
Markel American Insurance Company	Virginia
Evanston Insurance Company	Illinois
Markel Aspen, Inc.	Delaware
FirstComp Insurance Company	Nebraska
Markel International Holdings (Delaware) Limited	Delaware
Markel International Limited	England
Markel Capital Holdings Limited	England
Markel Capital Limited	England
Markel International Insurance Company Limited	England
Markel Syndicate Management Limited	England
Alterra Capital UK Limited	England
Alterra at Lloyd's Limited	England
Alterra Corporate Capital 2 Limited	England
Alterra Corporate Capital 3 Limited	England
Alterra Corporate Capital 4 Limited	England
Alterra Corporate Capital 5 Limited	England
Alterra Corporate Capital 6 Limited	England
Markel Underwriting Services Limited	England
Markel Servicios S.A.	Argentina
Galleon Marine Insurance Agency Limited	England
JanJer Limited	England
Abbey Protection Limited	England
Abbey Protection Group Ltd.	England
Abbey Legal Holdings Limited	England
Abbey Legal Protection Limited	England
Abbey Tax & Consultancy Services Limited	England
Effective Tax Solutions Ltd	England
Abbey Tax Protection Limited	England
Accountax Consulting Limited	England
Accountax UK Limited	England
Accountax Law Limited	England
LHS Solicitors LLP	England
MINT Canadian Specialty Underwriters Limited	Canada
Markel Canada Limited	Canada
Alterra Capital Holdings Limited	Bermuda
Alterra Capital America Limited	England
Alterra USA Holdings Limited	Delaware
Alterra Finance LLC	Delaware
Alterra Insurance USA Inc.	Delaware
Markel Global Reinsurance Company	Delaware
Alterra America Insurance Company	Delaware
Alterra Capital Services Limited	Ireland
Alterra Holdings Limited	Bermuda
Alterra Agency Limited	Bermuda
Alterra Capital Brazil Limited	England
Markel Participações Ltda.	Brazil
Markel Resseguradora do Brasil S.A.	Brazil
Markel Seguradora do Brasil SA	Brazil
Markel Bermuda Limited	Bermuda
Alterra Diversified Strategies Limited	Bermuda

Markel CATCo Investment Management Ltd.	Bermuda
Markel Service, Incorporated	Virginia
Thompson Insurance Enterprises, LLC	Delaware
Markel Ventures, Inc.	Virginia
Eagle Construction of Va., LLC	Virginia
Eagle Realty of Virginia, LLC	Virginia
Innslake Title Agency, LLC	Virginia
Eagle Construction of Va. Properties, LLC	Virginia
Eagle Commercial Construction, LLC	Virginia
Eagle Commercial Realty, LLC	Virginia
Precision Realty, LLC	Virginia
Ellicott Dredge Enterprises, LLC	Maryland
Ellicott Dredges, LLC	Maryland
Baltimore Dredge International, Inc.	Maryland
Liquid Waste Technology, LLC	Maryland
Rohr International Dredge Co., LLC	Maryland
Rohr Dredge North America, LLC	Maryland
Rohr International Dredge Holdings, Inc.	Maryland
Rohr Bagger GmbH	Germany
Rohr France, societie responsibilitie limitee	France
IDRECO B.V.	The Netherlands
Tennessee Dredge Company, LLC	Maryland
Markel Food Group, Inc.	Virginia
AMF Automation Technologies, LLC	Virginia
Baking Technology Systems, Inc.	Georgia
Solbern, Inc.	Virginia
Reading Bakery Systems, Inc.	Pennsylvania
Tromp Group Americas, LLC	Virginia
Tromp Group B.V.	The Netherlands
Panel Specialists, Inc.	Texas
ParkLand Ventures, Inc.	Virginia
Havco WP LLC	Delaware
Diamond Healthcare Corporation	Virginia
RD Holdings, LLC	Virginia
Retail Data, LLC	Virginia
PMD Holdings, Inc.	Virginia
PartnerMD, LLC	Virginia
WI Holdings Inc.	Pennsylvania
Weldship Industries, Inc.	New Jersey
Texas Trailer Corporation	Texas
Cottrell, Inc.	Georgia
Cottrell Properties, L.P.	Georgia
Cottrell Enterprises, Inc.	Georgia
CapTech Ventures, Inc.	Virginia
Markel West, Inc.	California
Black/White & Associates Insurance Brokers	California
Prairie State Administrative Services, Inc.	Illinois
Markel-Gayner Asset Management Corporation	Virginia
Markel Properties, LLC	Virginia
Mark IV Realty Corporation	Virginia
Schultz-Markel Associates, LLC	Delaware
Schultz Markel II, LLC	New Jersey
Markel Holdings Netherlands B.V.	The Netherlands

EX-23

Exhibit 23

Consent of Independent Registered Public Accounting Firm

The Board of Directors

Markel Corporation:

We consent to the incorporation by reference in the registration statements No. 333-202428 on Form S-3; No. 333-107661, No. 333-143393, No. 333-170047, No. 333-178051, No. 333-181419, No. 333-188294, No. 333-211414, and No. 333-211415 on Form S-8; and No. 333-185715 on Form S-4 of Markel Corporation of our reports dated February 24, 2017 with respect to the consolidated balance sheets of Markel Corporation and subsidiaries (the Company) as of December 31, 2016 and 2015, and the related consolidated statements of income and comprehensive income, changes in equity and cash flows for each of the years in the three-year period ended December 31, 2016, and the effectiveness of internal control over financial reporting as of December 31, 2016, which reports appear in the December 31, 2016 annual report on Form 10-K of Markel Corporation.

/s/ KPMG LLP

Richmond, Virginia

February 24, 2017

EX-31.1

Exhibit 31.1

CERTIFICATION OF PRINCIPAL EXECUTIVE OFFICER

PURSUANT TO RULE 13a-14(a)/15d-14(a)

I, Alan I. Kirshner, certify that:

1. I have reviewed this annual report on Form 10-K of Markel Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

February 24, 2017	/s/ Alan I. Kirshner
	Alan I. Kirshner
	Executive Chairman
	(Principal Executive Officer)

EX-31.2

Exhibit 31.2

CERTIFICATION OF PRINCIPAL FINANCIAL OFFICER

PURSUANT TO RULE 13a-14(a)/15d-14(a)

I, Anne G. Waleski, certify that:

1. I have reviewed this annual report on Form 10-K of Markel Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

February 24, 2017	/s/ Anne G. Waleski
	Anne G. Waleski
	Executive Vice President and Chief Financial Officer
	(Principal Financial Officer)

EX-32.1

Exhibit 32.1

CERTIFICATION OF PRINCIPAL EXECUTIVE OFFICER

FURNISHED PURSUANT TO 18 U.S.C. SECTION 1350

In connection with the Annual Report of Markel Corporation (the "Company") on Form 10-K for the year ended December 31, 2016 as filed with the Securities and Exchange Commission on the date hereof (the "Report"), I, Alan I. Kirshner, Executive Chairman of the Company, certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to my knowledge:

1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ Alan I. Kirshner

Alan I. Kirshner

Executive Chairman

(Principal Executive Officer)

February 24, 2017

EX-32.2

Exhibit 32.2

CERTIFICATION OF PRINCIPAL FINANCIAL OFFICER

FURNISHED PURSUANT TO 18 U.S.C. SECTION 1350

In connection with the Annual Report of Markel Corporation (the "Company") on Form 10-K for the year ended December 31, 2016 as filed with the Securities and Exchange Commission on the date hereof (the "Report"), I, Anne G. Waleski, Executive Vice President and Chief Financial Officer of the Company, certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to my knowledge:

1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ Anne G. Waleski

Anne G. Waleski

Executive Vice President and Chief Financial Officer

(Principal Financial Officer)

February 24, 2017

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Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2016	Feb. 06, 2017	Jun. 30, 2016
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2016
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	FY
Entity Registrant Name	MARKEL CORP
Entity Central Index Key	0001096343
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		13,955,617
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 12,978,000,000

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Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
ASSETS
Fixed maturities (amortized cost of $9,591,734 in 2016 and $9,038,158 in 2015)	$ 9,891,510	$ 9,394,468
Equity securities (cost of $2,481,448 in 2016 and $2,208,834 in 2015)	4,745,841	4,074,475
Short-term investments (estimated fair value approximates cost)	2,336,151	1,642,261
Total Investments	16,973,502	15,111,204
Cash and cash equivalents	1,738,747	2,630,009
Restricted cash and cash equivalents	346,417	440,132
Receivables	1,241,649	1,113,703
Reinsurance recoverable on unpaid losses	2,006,945	2,016,665
Reinsurance recoverable on paid losses	64,892	50,123
Deferred policy acquisition costs	392,410	352,756
Prepaid reinsurance premiums	299,923	322,362
Goodwill	1,142,248	1,167,844
Intangible assets	722,542	792,372
Other assets	946,024	941,945
Total Assets	25,875,299	24,939,115
LIABILITIES AND EQUITY
Unpaid losses and loss adjustment expenses	10,115,662	10,251,953
Life and annuity benefits	1,049,654	1,123,275
Unearned premiums	2,263,838	2,166,105
Payables to insurance and reinsurance companies	231,327	224,921
Senior long-term debt and other debt (estimated fair value of $2,721,000 in 2016 and $2,403,000 in 2015)	2,574,529	2,239,271
Other liabilities	1,099,200	1,030,023
Total Liabilities	17,334,210	17,035,548
Redeemable noncontrolling interests	73,678	62,958
Commitments and contingencies
Shareholders' equity:
Common stock	3,368,666	3,342,357
Retained earnings	3,526,395	3,137,285
Accumulated other comprehensive income	1,565,866	1,354,508
Total Shareholders' Equity	8,460,927	7,834,150
Noncontrolling interests	6,484	6,459
Total Equity	8,467,411	7,840,609
Total Liabilities and Equity	$ 25,875,299	$ 24,939,115

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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Fixed maturities, amortized cost	$ 9,591,734	$ 9,038,158
Equity securities, cost	2,481,448	2,208,834
Senior long-term debt and other debt, estimated fair value	$ 2,721,000	$ 2,403,000

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Consolidated Statements Of Income And Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
OPERATING REVENUES
Earned premiums	$ 3,865,870	$ 3,823,532	$ 3,840,912
Net investment income	373,230	353,213	363,230
Net realized investment gains:
Other-than-temporary impairment losses	(18,355)	(44,481)	(4,784)
Net realized investment gains, excluding other-than-temporary impairment losses	83,502	150,961	50,784
Net realized investment gains	65,147	106,480	46,000
Other revenues	1,307,779	1,086,758	883,525
Total Operating Revenues	5,612,026	5,369,983	5,133,667
OPERATING EXPENSES
Losses and loss adjustment expenses	2,050,744	1,938,745	2,202,467
Underwriting, acquisition and insurance expenses	1,498,590	1,455,080	1,460,882
Amortization of intangible assets	68,533	68,947	57,627
Other expenses	1,190,243	1,046,805	854,871
Total Operating Expenses	4,808,110	4,509,577	4,575,847
Operating Income	803,916	860,406	557,820
Interest expense	129,896	118,301	117,442
Loss on early extinguishment of debt	44,100	0	0
Income Before Income Taxes	629,920	742,105	440,378
Income tax expense	169,477	152,963	116,690
Net Income	460,443	589,142	323,688
Net income attributable to noncontrolling interests	4,754	6,370	2,506
Net Income to Shareholders	455,689	582,772	321,182
OTHER COMPREHENSIVE INCOME (LOSS)
Net holding gains (losses) arising during the period	275,661	(240,170)	687,735
Change in unrealized other-than-temporary impairment losses on fixed maturities arising during the period	35	160	173
Reclassification adjustments for net gains included in net income	(33,528)	(80,482)	(26,161)
Change in net unrealized gains on investments, net of taxes	242,168	(320,492)	661,747
Change in foreign currency translation adjustments, net of taxes	(11,704)	(29,278)	(32,241)
Change in net actuarial pension loss, net of taxes	(19,100)	(352)	(14,750)
Total Other Comprehensive Income (Loss)	211,364	(350,122)	614,756
Comprehensive Income	671,807	239,020	938,444
Comprehensive income attributable to noncontrolling interests	4,760	6,297	2,510
Comprehensive Income to Shareholders	$ 667,047	$ 232,723	$ 935,934
NET INCOME PER SHARE
Basic (dollars per share)	$ 31.41	$ 41.99	$ 22.38
Diluted (dollars per share)	$ 31.27	$ 41.74	$ 22.27

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Consolidated Statements Of Changes In Equity - USD ($) shares in Thousands, $ in Thousands	Total	Total Equity [Member]	Total Shareholders' Equity [Member]	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Noncontrolling Interests [Member]	Redeemable Noncontrolling Interests [Member]
Balance at Dec. 31, 2013		$ 6,678,010	$ 6,673,577	$ 3,288,863	$ 2,294,909	$ 1,089,805	$ 4,433
Balance, shares at Dec. 31, 2013				13,986
Balance, redeemable noncontrolling interests at Dec. 31, 2013								$ 72,183
Net income (loss)	$ 323,688	319,201	321,182		321,182	0	(1,981)	4,487
Other comprehensive income (loss)	614,756	614,752	614,752		0	614,752	0	4
Comprehensive Income	938,444	933,953	935,934				(1,981)	4,491
Issuance of common stock		5,691	5,691	$ 5,691	0	0	0	0
Issuance of common stock, shares				19
Repurchase of common stock		(26,053)	(26,053)	$ 0	(26,053)	0	0	0
Repurchase of common stock, shares				(43)
Restricted stock awards expensed		22,935	22,935	$ 22,935	0	0	0	0
Restricted stock awards expensed, shares				0
Adjustment of redeemable noncontrolling interests		(8,186)	(8,186)	$ 0	(8,186)	0	0	8,186
Adjustment of redeemable noncontrolling interests, shares				0
Purchase of noncontrolling interest		(9,352)	(10,257)	$ (10,257)	0	0	905	(18,566)
Purchase of noncontrolling interest, shares				0
Other		5,004	1,177	$ 1,163	14	0	3,827	(5,246)
Other, shares				0
Balance at Dec. 31, 2014		7,602,002	7,594,818	$ 3,308,395	2,581,866	1,704,557	7,184
Balance, shares at Dec. 31, 2014				13,962
Balance, redeemable noncontrolling interests at Dec. 31, 2014								61,048
Net income (loss)	589,142	581,784	582,772		582,772	0	(988)	7,358
Other comprehensive income (loss)	(350,122)	(350,049)	(350,049)		0	(350,049)	0	(73)
Comprehensive Income	239,020	231,735	232,723				(988)	7,285
Issuance of common stock		4,752	4,752	$ 4,752	0	0	0	0
Issuance of common stock, shares				34
Repurchase of common stock		(31,491)	(31,491)	$ 0	(31,491)	0	0	0
Repurchase of common stock, shares				(37)
Restricted stock awards expensed		24,129	24,129	$ 24,129	0	0	0	0
Restricted stock awards expensed, shares				0
Acquisition of CapTech		0	0	$ 0	0	0	0	13,817
Acquisition of CapTech, shares				0
Adjustment of redeemable noncontrolling interests		4,144	4,144	$ 0	4,144	0	0	(4,144)
Adjustment of redeemable noncontrolling interests, shares				0
Purchase of noncontrolling interest		(1,447)	(1,447)	$ (1,447)	0	0	0	(8,224)
Purchase of noncontrolling interest, shares				0
Other		6,785	6,522	$ 6,528	(6)	0	263	(6,824)
Other, shares				0
Balance at Dec. 31, 2015	7,840,609	7,840,609	7,834,150	$ 3,342,357	3,137,285	1,354,508	6,459
Balance, shares at Dec. 31, 2015				13,959
Balance, redeemable noncontrolling interests at Dec. 31, 2015	62,958							62,958
Net income (loss)	460,443	455,788	455,689		455,689	0	99	4,655
Other comprehensive income (loss)	211,364	211,358	211,358		0	211,358	0	6
Comprehensive Income	671,807	667,146	667,047				99	4,661
Issuance of common stock		4,623	4,623	$ 4,623	0	0	0	0
Issuance of common stock, shares				54
Repurchase of common stock		(51,142)	(51,142)	$ 0	(51,142)	0	0	0
Repurchase of common stock, shares				(58)
Restricted stock awards expensed		21,336	21,336	$ 21,336	0	0	0	0
Restricted stock awards expensed, shares				0
Adjustment of redeemable noncontrolling interests		(15,472)	(15,472)	$ 0	(15,472)	0	0	15,472
Adjustment of redeemable noncontrolling interests, shares				0
Purchase of noncontrolling interest		350	350	$ 350	0	0	0	(3,517)
Purchase of noncontrolling interest, shares				0
Other		(39)	35	$ 0	35	0	(74)	(5,896)
Other, shares				0
Balance at Dec. 31, 2016	8,467,411	$ 8,467,411	$ 8,460,927	$ 3,368,666	$ 3,526,395	$ 1,565,866	$ 6,484
Balance, shares at Dec. 31, 2016				13,955
Balance, redeemable noncontrolling interests at Dec. 31, 2016	$ 73,678							$ 73,678

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Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
OPERATING ACTIVITIES
Net income	$ 460,443	$ 589,142	$ 323,688
Adjustments to reconcile net income to net cash provided by operating activities:
Deferred income tax expense (benefit)	63,358	(9,678)	84,543
Depreciation and amortization	194,147	200,987	203,580
Net realized investment gains	(65,147)	(106,480)	(46,000)
Loss on early extinguishment of debt	44,100	0	0
Decrease (increase) in receivables	(163,123)	5,604	21,148
Increase in deferred policy acquisition costs	(41,619)	(7,360)	(99,387)
Increase (decrease) in unpaid losses and loss adjustment expenses, net	(9,429)	(91,960)	249,873
Decrease in life and annuity benefits	(54,580)	(85,257)	(62,883)
Increase (decrease) in unearned premiums, net	134,593	(4,522)	147,840
Increase (decrease) in payables to insurance and reinsurance companies	11,582	(31,829)	(45,204)
Increase (decrease) in income taxes payable	(16,484)	27,817	(46,576)
Increase in accrued expenses	67,994	97,273	56,042
Decrease in other liabilities	(90,571)	(5,793)	(76,383)
Other	(641)	73,207	6,511
Net Cash Provided By Operating Activities	534,623	651,151	716,792
INVESTING ACTIVITIES
Proceeds from sales of fixed maturities and equity securities	365,822	538,978	1,286,871
Proceeds from maturities, calls and prepayments of fixed maturities	963,165	1,503,616	1,420,817
Cost of fixed maturities and equity securities purchased	(2,205,939)	(1,576,254)	(3,153,055)
Net change in short-term investments	(689,194)	(62,124)	(129,164)
Proceeds from sales of equity method investments	8,790	23,155	107,292
Cost of equity method investments	(8,576)	(21,849)	(16,081)
Change in restricted cash and cash equivalents	93,370	62,324	264,701
Additions to property and equipment	(63,674)	(79,755)	(82,132)
Acquisitions, net of cash acquired	(7,527)	(261,521)	(319,086)
Other	(1,348)	(797)	(2,368)
Net Cash Provided (Used) By Investing Activities	(1,545,111)	125,773	(622,205)
FINANCING ACTIVITIES
Additions to senior long-term debt and other debt	559,300	69,797	89,480
Repayment and retirement of senior long-term debt and other debt	(278,363)	(88,020)	(83,722)
Premiums and fees related to early extinguishment of debt	(43,691)	0	0
Repurchases of common stock	(51,142)	(31,491)	(26,053)
Issuance of common stock	4,623	4,752	5,691
Payment of contingent consideration	(14,219)	(9,263)	(2,766)
Purchase of redeemable noncontrolling interests	(3,167)	(12,474)	(25,918)
Distributions to noncontrolling interests	(5,949)	(6,287)	(5,245)
Other	(15,373)	(1,225)	(18,591)
Net Cash Provided (Used) By Financing Activities	152,019	(74,211)	(67,124)
Effect of foreign currency rate changes on cash and cash equivalents	(32,793)	(32,873)	(45,820)
Increase (decrease) in cash and cash equivalents	(891,262)	669,840	(18,357)
Cash and cash equivalents at beginning of year	2,630,009	1,960,169	1,978,526
CASH AND CASH EQUIVALENTS AT END OF YEAR	$ 1,738,747	$ 2,630,009	$ 1,960,169

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Summary Of Significant Accounting Policies

12 Months Ended

Dec. 31, 2016

Accounting Policies [Abstract]

Summary Of Significant Accounting Policies

Summary of Significant Accounting Policies

Markel Corporation is a diverse financial holding company serving a variety of niche markets. Markel Corporation's principal business markets and underwrites specialty insurance products. Through its wholly owned subsidiary, Markel Ventures, Inc. (Markel Ventures), Markel Corporation also owns interests in various industrial and service businesses that operate outside of the specialty insurance marketplace.

a)Basis of Presentation. The accompanying consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (U.S. GAAP) and include the accounts of Markel Corporation and its consolidated subsidiaries, as well as any variable interest entities (VIEs) that meet the requirements for consolidation (the Company). All significant intercompany balances and transactions have been eliminated in consolidation. The Company consolidates the results of its Markel Ventures subsidiaries on a one-month lag. Certain prior year amounts have been reclassified to conform to the current presentation.

b)Use of Estimates. The preparation of financial statements in accordance with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses and the disclosure of contingent assets and liabilities. Management periodically reviews its estimates and assumptions. Quarterly reviews include evaluating the adequacy of reserves for unpaid losses and loss adjustment expenses, life and annuity reinsurance benefit reserves, litigation contingencies, the reinsurance allowance for doubtful accounts and income tax liabilities, as well as analyzing the recoverability of deferred tax assets, estimating reinsurance premiums written and earned and evaluating the investment portfolio for other-than-temporary declines in estimated fair value. Estimates and assumptions for goodwill and intangible assets are reviewed in conjunction with an acquisition, and goodwill and indefinite-lived intangible assets are reassessed at least annually for impairment. Actual results may differ materially from the estimates and assumptions used in preparing the consolidated financial statements.

c)Investments. Available-for-sale investments are recorded at estimated fair value. Unrealized gains and losses on investments, net of income taxes, are included in accumulated other comprehensive income in shareholders' equity. The Company completes a detailed analysis each quarter to assess whether the decline in the fair value of any investment below its cost basis is deemed other-than-temporary.

Premiums and discounts are amortized or accreted over the lives of the related fixed maturities as an adjustment to the yield using the effective interest method. Dividend and interest income are recognized when earned. Realized investment gains or losses are included in earnings. Realized gains or losses from sales of investments are derived using the first-in, first-out method.

The Company also has certain investments in fixed maturity and equity securities that are recorded at estimated fair value with changes in unrealized gains and losses recorded in net income. These fixed maturity and equity security investments totaled $41.4 million and $191.2 million, respectively, as of December 31, 2016 and are included in fixed maturities and equity securities in the consolidated balance sheets.

Investments accounted for under the equity method of accounting are recorded at cost within other assets on the consolidated balance sheets and subsequently increased or decreased by the Company's proportionate share of the net income or loss of the investee. The Company records its proportionate share of net income or loss of the investee in net investment income. The Company records its proportionate share of other comprehensive income or loss of the investee as a component of other comprehensive income (loss). Dividends or other equity distributions are recorded as a reduction of the investment. The Company reviews equity method investments for impairment when events or circumstances indicate that a decline in the fair value of the investment below its carrying value is other-than-temporary.

d)Cash and Cash Equivalents. The Company considers all investments with original maturities of 90 days or less to be cash equivalents. The carrying value of the Company's cash and cash equivalents and restricted cash and cash equivalents approximates fair value.

e)Receivables. Receivables include amounts receivable from agents, brokers and insureds, which represent premiums that are both currently due and amounts not yet due on insurance and reinsurance policies. Premiums for insurance policies are generally due at inception. Premiums for reinsurance policies generally become due over the period of coverage based on the policy terms. The Company monitors the credit risk associated with premiums receivable, taking into consideration the fact that in certain instances credit risk may be reduced by the Company's right to offset loss obligations or unearned premiums against premiums receivable. Amounts deemed uncollectible are charged to net income in the period they are determined. Changes in the estimate of reinsurance premiums written will result in an adjustment to premiums receivable in the period they are determined.

f)Reinsurance Recoverables. Amounts recoverable from reinsurers are estimated in a manner consistent with the claim liability associated with the reinsured business. Allowances are established for amounts deemed uncollectible and reinsurance recoverables are recorded net of these allowances. The Company evaluates the financial condition of its reinsurers and monitors concentration risk to minimize its exposure to significant losses from individual reinsurers.

g)Deferred Policy Acquisition Costs. Costs directly related to the acquisition of insurance premiums are deferred and amortized over the related policy period, generally one year. The Company only defers acquisition costs incurred that are related directly to the successful acquisition of new or renewal insurance contracts, including commissions to agents and brokers and premium taxes. Commissions received related to reinsurance premiums ceded are netted against broker commissions in determining acquisition costs eligible for deferral. To the extent that future policy revenues on existing policies are not adequate to cover related costs and expenses, deferred policy acquisition costs are charged to earnings. The Company does not consider anticipated investment income in determining whether a premium deficiency exists.

h)Goodwill and Intangible Assets. Goodwill and intangible assets are recorded as a result of business acquisitions. Goodwill represents the excess of the amount paid to acquire a business over the net fair value of assets acquired and liabilities assumed at the date of acquisition. Indefinite-lived and other intangible assets are recorded at fair value as of the acquisition date. The determination of the fair value of certain assets acquired and liabilities assumed involves significant judgment and the use of valuation models and other estimates, which require assumptions that are inherently subjective. Goodwill and indefinite-lived intangible assets are tested for impairment at least annually. The Company completes an annual test during the fourth quarter of each year based upon the results of operations through September 30. Intangible assets with definite lives are amortized using the straight-line method over their estimated useful lives, generally five to 20 years, and are reviewed for impairment when events or circumstances indicate that their carrying value may not be recoverable.

i)Property and Equipment. Property and equipment are stated at cost less accumulated depreciation and amortization. Depreciation and amortization of property and equipment are calculated using the straight-line method over the estimated useful lives (generally, the lower of the life of the lease or the estimated useful life for leasehold improvements, ten to 40 years for buildings, seven to 40 years for land improvements, three to ten years for furniture and equipment and three to 25 years for other property and equipment).

j)Redeemable Noncontrolling Interests. The Company owns controlling interests in various companies through its Markel Ventures operations. In some cases, the Company has the option to acquire the remaining equity interests, and the remaining equity interests have the option to sell their interests to the Company, in the future. The redemption value of the remaining equity interests is generally based on the respective company's earnings in specified periods preceding the redemption date. The redeemable noncontrolling interests generally become redeemable through 2020.

The Company recognizes changes in the redemption value that exceed the carrying value of redeemable noncontrolling interests to retained earnings as if the balance sheet date were also the redemption date. Changes in the redemption value also result in an adjustment to net income to shareholders in the calculation of basic and diluted net income per share. The change in the redemption value of redeemable noncontrolling interests in 2016, 2015 and 2014 resulted in an adjustment to retained earnings of a decrease of $15.5 million, an increase of $4.1 million, and a decrease of $8.2 million, respectively.

k)Income Taxes. The Company records deferred income taxes to reflect the net tax effect of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and their tax bases. Deferred tax assets are reduced by a valuation allowance when management believes it is more likely than not that some, or all, of the deferred tax assets will not be realized. The Company recognizes the tax benefit from an uncertain tax position taken or expected to be taken in income tax returns only if it is more likely than not that the tax position will be sustained upon examination by tax authorities, based on the technical merits of the position. Tax positions that meet the more likely than not threshold are then measured using a probability weighted approach, whereby the largest amount of tax benefit that is greater than 50% likely of being realized upon ultimate settlement is recognized. The Company recognizes interest and penalties related to uncertain tax positions in income tax expense.

l)Unpaid Losses and Loss Adjustment Expenses. Unpaid losses and loss adjustment expenses on our property and casualty insurance business are based on evaluations of reported claims and estimates for losses and loss adjustment expenses incurred but not reported. Estimates for losses and loss adjustment expenses incurred but not reported are based on reserve development studies, among other things. The Company does not discount reserves for losses and loss adjustment expenses to reflect estimated present value, except for reserves assumed in connection with an acquisition, which are recorded at fair value at the acquisition date. Recorded reserves are estimates, and the ultimate liability may be greater or less than the estimates.

m)Life and Annuity Benefits. The Company previously acquired a block of long duration reinsurance contracts for life and annuity benefits which subject the Company to mortality, longevity and morbidity risks. The assumptions used to determine policy benefit reserves are generally locked-in for the life of the contract unless an unlocking event occurs. To the extent existing policy reserves, together with the present value of future gross premiums and expected investment income earned thereon, are not adequate to cover the present value of future benefits, settlement and maintenance costs, the locked-in assumptions are revised to current best estimate assumptions and a charge to earnings for life and annuity benefits is recognized at that time. Because of the assumptions and estimates used in establishing reserves for life and annuity benefit obligations and the long-term nature of these reinsurance contracts, the ultimate liability may be greater or less than the estimates.

Results attributable to the run-off of life and annuity reinsurance business are included in other revenues and other expenses in the Company's consolidated statements of income and comprehensive income and as part of the Company's Other Insurance (Discontinued Lines) segment.

n)Revenue Recognition.

Property and Casualty Premiums

Insurance premiums are generally earned on a pro rata basis over the policy period, typically one year. The cost of reinsurance ceded is initially recorded as prepaid reinsurance premiums and is amortized over the reinsurance contract period in proportion to the amount of insurance protection provided. Premiums ceded are netted against premiums written.

Assumed reinsurance premiums are recorded at the inception of each contract based upon contract terms and information received from cedents and brokers and are earned on a pro rata basis over the coverage period, or for multi-year contracts, in proportion with the underlying risk exposure to the extent there is variability in the exposure through the coverage period. Changes in reinsurance premium estimates are expected and may result in significant adjustments in any period. These estimates change over time as additional information regarding changes in underlying exposures is obtained. Any subsequent differences arising on such estimates are recorded as premiums written in the period they are determined and are earned on a pro rata basis over the coverage period. The Company uses the periodic method to account for assumed reinsurance from foreign reinsurers. The Company's foreign reinsurers provide sufficient information to record foreign assumed business in the same manner as the Company records assumed business from United States reinsurers.

Certain contracts that the Company writes provide for reinstatement of coverage. Reinstatement premiums are the premiums for the restoration of the insurance or reinsurance limit of a contract to its full amount after a loss occurrence by the insured or reinsured. The Company accrues for reinstatement premiums resulting from losses recorded. Such accruals are based upon contractual terms and management judgment is involved with respect to the amount of losses recorded. Changes in estimates of losses recorded on contracts with reinstatement premium features will result in changes in reinstatement premiums based on contractual terms. Reinstatement premiums are recognized at the time losses are recorded and are earned on a pro-rata basis over the coverage period.

Other Revenues

Other revenues primarily relate to the Company's Markel Ventures operations and consist of revenues from the sale of manufactured products and service revenues. Revenues from manufactured products are generally recognized at the time title transfers to the customer, which typically occurs at the point of shipment or delivery to the customer, depending on the terms of the sales arrangement. Revenues from services are generally recognized as the services are performed. Services provided pursuant to a contract are recognized either over the contract period or upon completion of the elements specified in the contract, depending on the terms of the contract.

Investment management fee income is recognized over the period in which investment management services are provided and is calculated and billed monthly based on the net asset value of the accounts managed. Performance fee arrangements entitle the Company to participate, on a fixed-percentage basis, in any net income generated in excess of an agreed-upon threshold as established by the underlying investment management agreements. In general, net income is calculated at the end of each calendar year and performance fees are payable annually. Following the preferred method identified in the Accounting Standards Codification (ASC) Topic 605, Revenue Recognition, such performance fee income is recorded at the conclusion of the contractual performance period, when all contingencies are resolved.

o)Stock-based Compensation. Stock-based compensation expense is generally recognized as part of underwriting, acquisition and insurance expenses over the requisite service period. Stock-based compensation expense, net of taxes, was $14.3 million in 2016, $16.3 million in 2015 and $18.7 million in 2014. See note 12.

p)Foreign Currency Translation. The functional currencies of the Company's foreign operations are the currencies in which the majority of their business is transacted. Assets and liabilities of foreign operations are translated into the United States Dollar using the exchange rates in effect at the balance sheet date. Revenues and expenses of foreign operations are translated using the average exchange rate for the period. Gains or losses from translating the financial statements of foreign operations denominated in a functional currency are included, net of taxes, in shareholders' equity as a component of accumulated other comprehensive income. Gains and losses arising from transactions denominated in a foreign currency other than a functional currency are included in net income.

The Company manages its exposure to foreign currency risk primarily by matching assets, other than goodwill and intangible assets, and liabilities denominated in the same currency. To the extent that assets and liabilities in foreign currencies are not matched, the Company is exposed to foreign currency risk. For functional currencies, the related exchange rate fluctuations are reflected in other comprehensive income (loss). The cumulative foreign currency translation adjustment, net of taxes, was a loss of $84.4 million and $72.7 million at December 31, 2016 and 2015, respectively.

q)Derivative Financial Instruments. Derivative instruments, including derivative instruments resulting from hedging activities, are measured at fair value and recognized as either assets or liabilities on the consolidated balance sheets. The changes in fair value of derivatives are recognized in earnings unless the derivative is designated as a hedge and qualifies for hedge accounting.

The Company's foreign currency forward contracts are generally designated and qualify as hedges of a net investment in a foreign operation. The effective portion of the change in fair value resulting from these hedges is reported in currency translation adjustments as part of other comprehensive income (loss). The ineffective portion of the change in fair value is recognized in earnings.

r)Comprehensive Income. Comprehensive income represents all changes in equity that result from recognized transactions and other economic events during the period. Other comprehensive income (loss) refers to revenues, expenses, gains and losses that under U.S. GAAP are included in comprehensive income but excluded from net income, such as unrealized gains or losses on investments, foreign currency translation adjustments and changes in net actuarial pension loss.

s)Net Income Per Share. Basic net income per share is computed by dividing adjusted net income to shareholders by the weighted average number of common shares outstanding during the year. Diluted net income per share is computed by dividing adjusted net income to shareholders by the weighted average number of common shares and dilutive potential common shares outstanding during the year. See note 12(b).

t)Variable Interest Entities. The Company determines whether it has relationships with entities defined as VIEs in accordance with ASC Topic 810, Consolidation. Under this guidance, a VIE is consolidated by the variable interest holder that is determined to be the primary beneficiary.

An entity in which the Company holds a variable interest is a VIE if any of the following conditions exist: (a) the total equity investment at risk is not sufficient to permit the entity to finance its activities without additional subordinated financial support, (b) as a group, the holders of equity investment at risk lack either the direct or indirect ability through voting rights or similar rights to make decisions about an entity's activities that most significantly impact the entity's economic performance or the obligation to absorb the expected losses or right to receive the expected residual returns, or (c) the voting rights of some investors are disproportionate to their obligation to absorb the expected losses of the entity, their rights to receive the expected residual returns of the entity, or both and substantially all of the entity's activities either involve or are conducted on behalf of an investor with disproportionately few voting rights.

The primary beneficiary is defined as the variable interest holder that is determined to have the controlling financial interest as a result of having both (a) the power to direct the activities of a VIE that most significantly impact the economic performance of the VIE and (b) the obligation to absorb losses or right to receive benefits from the VIE that could potentially be significant to the VIE.

The Company determines whether an entity is a VIE at the inception of our variable interest in the entity and upon the occurrence of certain reconsideration events. The Company continually reassesses whether it is the primary beneficiary of VIEs in which it holds a variable interest.

u)Recent Accounting Pronouncements.

Effective January 1, 2016, the Company adopted Financial Accounting Standards Board (FASB) Accounting Standards Update (ASU) No. 2015-02, Consolidation (Topic 810): Amendments to the Consolidation Analysis, which changes the way reporting enterprises evaluate whether (a) they should consolidate limited partnerships and similar entities, (b) fees paid to a decision maker or service provider are variable interests in a VIE, and (c) variable interests in a VIE held by related parties of the reporting enterprise require the reporting enterprise to consolidate the VIE. It also eliminates the VIE consolidation model based on majority exposure to variability that applied to certain investment companies and similar entities. The ASU also significantly changes how to evaluate voting rights for entities that are not similar to limited partnerships when determining whether the entity is a VIE, which may affect entities for which the decision making rights are conveyed through a contractual arrangement. The adoption of this guidance did not result in any changes to our previous consolidation conclusions.

Effective January 1, 2016, the Company adopted FASB ASU No. 2015-03, Interest-Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs. ASU No. 2015-03 requires that debt issuance costs related to a recognized debt liability be presented on the balance sheet as a direct deduction from the debt liability, similar to the presentation of debt discounts. The cost of issuing debt is no longer recorded as a separate asset on the balance sheet. The amortization of debt issuance costs continues to be included in interest expense. ASU No. 2015-03 was applied retrospectively to all periods presented. As a result, debt issuance costs totaling $2.2 million and $2.6 million were reclassified from other assets to senior long-term debt and other debt as of December 31, 2015 and December 31, 2014, respectively.The adoption of this ASU did not have an impact on the Company's results of operations or cash flows.

Effective January 1, 2016, the Company adopted FASB ASU No. 2015-05, Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer's Accounting for Fees Paid in a Cloud Computing Arrangement, which clarifies that software licenses contained in a cloud computing arrangement should be capitalized if the customer has the right to take possession of the software and the ability to run the software outside of the cloud computing arrangement. The adoption of this ASU did not have an impact on the Company's financial position, results of operations or cash flows.

Effective January 1, 2016, the Company adopted FASB ASU No. 2015-16, Business Combinations (Topic 805): Simplifying the Accounting for Measurement-Period Adjustments. ASU No. 2015-16 eliminates the requirement to retrospectively adjust the financial statements for measurement-period adjustments that occur in periods after a business combination is consummated. The adoption of this ASU did not have an impact on the Company's financial position, results of operations or cash flows and will be applied on a prospective basis, as applicable.

During the second quarter of 2016, the Company early adopted FASB ASU No. 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting, which changes several aspects of the accounting for share-based payment award transactions. Under the new guidance, all excess tax benefits or deficiencies associated with share-based payment award transactions are required to be recognized as an income tax benefit or expense in net income when the awards vest or are settled, with the corresponding cash flows recognized as an operating activity in the statement of cash flows. Excess tax benefits and deficiencies are no longer recognized in additional paid-in-capital. The new guidance also allows an employer to repurchase more of an employee's shares for tax witholding purposes without triggering liability accounting and to make a policy election to account for forfeitures as they occur, rather than estimating forfeitures upon issuance of the award. Upon adoption of ASU No. 2016-09, the Company elected to account for forfeitures as they occur, which had no impact on the consolidated financial statements. The provisions of ASU No. 2016-09 were adopted as of January 1, 2016 on a prospective basis and did not have a material impact on the Company's financial position, results of operations or cash flows.

Effective for the year ended December 31, 2016, the Company adopted FASB ASU No. 2015-09, Financial Services-Insurance (Topic 944): Disclosures about Short-Duration Contracts. ASU No. 2015-09 requires significant new disclosures for insurers relating to short-duration insurance contract claims and the unpaid claims liability rollforward for long and short-duration contracts. The guidance requires annual tabular disclosure, on a disaggregated basis, of undiscounted incurred and paid claim and allocated claim adjustment expense development by accident year, net of reinsurance, for up to 10 years. Tables must also include the total incurred but not reported claims liabilities, plus expected development on reported claims, and claims frequency for each accident year. A description of estimation methodologies and any significant changes in methodologies and assumptions used to calculate the liability and frequency is also required. Based on the disaggregated claims information in the tables, disclosure of historical average annual percentage payout of incurred claims is also required. The ASU requires retrospective application by providing comparative disclosures for each period presented, other than those that are only required for the most recent reporting period. These new annual disclosures have been included in note 9. Interim period disclosures must include a tabular rollforward and related qualitative information for the liability for unpaid losses and loss adjustment expenses. The interim disclosures are required beginning in the first quarter of 2017.

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), which creates a new comprehensive revenue recognition standard that will serve as a single source of revenue guidance for all companies in all industries. The guidance applies to all companies that either enter into contracts with customers to transfer goods or services or enter into contracts for the transfer of nonfinancial assets, unless those contracts are within the scope of other standards, such as insurance contracts. ASU No. 2014-09's core principle is that a company will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. In doing so, companies will need to use more judgment and make more estimates than under the current guidance. These may include identifying performance obligations in the contract, estimating the amount of variable consideration to include in the transaction price and allocating the transaction price to each separate performance obligation. ASU No. 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Consideration (Reporting Revenue Gross versus Net), ASU No. 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing, ASU No. 2016-12, Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients and ASU No. 2016-20, Technical Corrections and Improvements to Topic 606, Revenue from Contracts with Customers were all issued in 2016 as amendments to ASU No. 2014-09. These amendments will be evaluated and adopted in conjunction with ASU No. 2014-09. The Company expects to adopt ASU No. 2014-09 as of January 1, 2018 using the modified retrospective method, whereby the cumulative effect of adoption will be recognized at the date of initial application. The adoption of this ASU will not impact the Company's insurance premium revenues or revenues from its investment portfolio, which totaled 77% of consolidated revenues for the year ended December 31, 2016, but will impact the Company's other revenues, which are primarily attributable to its non-insurance operations. The Company has completed an inventory of revenue streams from its non-insurance operations, which are comprised of a diverse portfolio of contracts across various industries, and is currently evaluating changes, if any, that will be necessary. The Company has not determined the full impact that adopting the new accounting guidance will have on its consolidated financial statements.

In July 2015, the FASB issued ASU No. 2015-11, Inventory (Topic 330): Simplifying the Measurement of Inventory. The ASU changes the measurement principle for inventory from the lower of cost or market to lower of cost and net realizable value and eliminates the requirement to consider replacement cost or net realizable value less an approximately normal profit margin when measuring inventory. ASU No. 2015-11 becomes effective for the Company during the first quarter of 2017 and will be applied prospectively. Adoption of this ASU is not expected to have a material impact on the Company's financial position, results of operations or cash flows.

In January 2016, the FASB issued ASU No. 2016-01, Financial Instruments (Topic 825): Recognition and Measurement of Financial Assets and Financial Liabilities. The ASU significantly changes the income statement impact of equity investments and the recognition of changes in fair value of financial liabilities attributable to an entity's own credit risk when the fair value option is elected. The ASU requires equity instruments that do not result in consolidation and are not accounted for under the equity method to be measured at fair value and to recognize any changes in fair value in net income rather than other comprehensive income (loss). ASU No. 2016-01 becomes effective for the Company during the first quarter of 2018 and will be applied using a cumulative-effect adjustment to retained earnings as of the beginning of the fiscal year of adoption. The provisions related to equity investments without a readily determinable fair value will be applied prospectively to equity investments as of the adoption date. The Company is currently evaluating ASU No. 2016-01 to determine the impact that adopting this standard will have on the consolidated financial statements. Adoption of this ASU is not expected to have a material impact on the Company's financial position, cash flows, or total comprehensive income, but will have a material impact on the Company's results of operations as changes in fair value of equity instruments will be presented in net income rather than other comprehensive income (loss). As of December 31, 2016, accumulated other comprehensive income included $1.5 billion of net unrealized gains on equity securities, net of taxes. See note 3(f) for details regarding the change in net unrealized gains on equity securities included in other comprehensive income (loss) for the years ended December 31, 2016, 2015 and 2014.

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). The ASU requires lessees to record most leases on their balance sheets as a lease liability with a corresponding right-of-use asset, but continue to recognize the related leasing expense within net income. The guidance also eliminates real estate-specific provisions for all entities. For lessors, the guidance modifies the classification criteria and the accounting for sales-type and direct financing leases. ASU No. 2016-02 becomes effective for the Company during the first quarter of 2019 and will be applied under a modified retrospective approach for leases that exist or are entered into after the beginning of the earliest comparative period in the financial statements. See note 16 for details regarding the Company's minimum annual rental commitments payable directly by the Company for noncancelable operating leases at December 31, 2016, which will be subject to this new guidance. The calculation of the lease liability and right-of-use asset requires further analysis of the underlying leases to determine which portion of the underlying lease payments are required to be included in the calculation. The Company is currently evaluating ASU No. 2016-02 to determine the potential impact that adopting this standard will have on its consolidated financial statements.

In March 2016, the FASB issued ASU No. 2016-07, Investments - Equity Method and Joint Ventures (Topic 323): Simplifying the Transition to the Equity Method of Accounting. The ASU eliminates the requirement for an investor to retroactively apply the equity method when its increase in ownership interest or degree of influence in an investee triggers equity method accounting. ASU No. 2016-07 becomes effective for the Company during the first quarter of 2017 and will be applied prospectively. Early adoption is permitted. Adoption of this ASU is not expected to have an impact on the Company's financial position, results of operations or cash flows.

In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The ASU replaces the current incurred loss model used to measure impairment losses with an expected loss model for trade, reinsurance, and other receivables as well as financial instruments measured at amortized cost. For available-for-sale debt securities, which are measured at fair value, the ASU requires entities to record impairments as an allowance, rather than a reduction of the amortized cost, as is currently required under the other-than-temporary impairment model. ASU No. 2016-13 becomes effective for the Company during the first quarter of 2020 and will be applied using a modified-retrospective approach through a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective. The Company is currently evaluating ASU No. 2016-13 to determine the potential impact that adopting this standard will have on the consolidated financial statements. Application of the new expected loss model for measuring impairment losses will not impact the Company's investment portfolio, all of which is considered available-for sale, but will impact the Company's other financial assets, including its reinsurance recoverables. Upon adoption of this ASU, any impairment losses on the Company's available-for-sale debt securities will be recorded as an allowance, subject to reversal, rather than as a reduction in amortized cost.

In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments, which is intended to reduce diversity in practice in how certain transactions are classified in the statement of cash flows. Some of the topics covered by the ASU include the classification of debt prepayment and extinguishment costs, contingent consideration payments made after a business combination and distributions from equity method investees. ASU No. 2016-15 becomes effective for the Company during the first quarter of 2018 and will be applied using a retrospective transition approach. Early adoption is permitted. The Company is currently evaluating ASU No. 2016-15 to determine the potential impact that adopting this standard will have on the consolidated statements of cash flows. Adoption of this ASU will not impact the Company's financial position or results of operations and is not expected to have a material impact on the Company's consolidated statements of cash flows.

In October 2016, the FASB issued ASU No. 2016-16, Income Taxes (Topic 740): Intra-entity Transfers of Assets Other Than Inventory, which will require companies to account for the income tax effects of intercompany transfers of assets other than inventory when the transfer occurs. Intercompany transfers of assets across tax jurisdictions may have cash tax consequences and may be taxable events as proscribed by the applicable tax jurisdiction. Currently, companies are prohibited from recognizing those tax effects until the asset has been sold to an outside party. The income tax effects of intercompany inventory transactions will continue to be deferred. ASU No. 2016-16 becomes effective for the Company during the first quarter of 2018 and will be applied using a modified retrospective transition approach. Early adoption is permitted. Adoption of this ASU will not impact the Company's cash flows and is not expected to have a material impact on the Company's financial position or results of operations.

In October 2016, the FASBissuedASU No. 2016-17, Consolidation (Topic 810): Interests Held through Related Parties That Are under Common Control, which will require a single decision maker evaluating whether it is the primary beneficiary of a VIE to consider its indirect interests held by related parties that are under common control on a proportionate basis. Under the guidance the FASB issued last year, which was adopted by the Company effective January 1, 2016, the decision maker was required to consider those interests in their entirety. ASU No. 2016-17 becomes effective for the Company beginning in 2017 and will be applied retrospectively to 2016, the fiscal year in which the amendments in Update 2015-02 initially were applied, as described above. Adoption of this guidance is not expected to result in any changes to our previous consolidation conclusions.

In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash. The ASU requires that a statement of cash flows explain the change during the period of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. Currently, changes in restricted cash and cash equivalents are presented as operating, investing or financing activities on the statement of cash flows. ASU No. 2016-18 becomes effective for the Company during the first quarter of 2018 and will be applied using a retrospective approach for each period presented. The Company currently presents changes in restricted cash and cash equivalents on the face of the statements of cash flows as an investing activity. Upon adoption of this ASU, the Company's statements of cash flows will include restricted cash and cash equivalents in the beginning-of-period and end-of-period total amounts for cash, cash equivalents and restricted cash and cash equivalents. Adoption of this ASU will not impact the Company's financial position, results of operations or total comprehensive income (loss).

In January 2017, the FASB issued ASU No. 2017-04, Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. The ASU eliminates Step 2 of the goodwill impairment test, which is performed by estimating the fair value of individual assets and liabilities of the reporting unit to calculate the implied fair value of goodwill. Instead, an entity will record a goodwill impairment charge based on the excess of a reporting unit's carrying value over its estimated fair value, not to exceed the carrying amount of goodwill. ASU No. 2017-04 becomes effective for the Company during the first quarter of 2020 and will be applied prospectively. Early adoption is permitted. Adoption of this ASU is not expected to have a material impact on the Company's financial position, results of operations or cash flows.

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Acquisitions

12 Months Ended

Dec. 31, 2016

Acquisitions [Abstract]

Acquisitions

Acquisitions

CATCo Investment Management Acquisition

In December 2015, the Company completed the acquisition of substantially all of the assets of CATCo Investment Management Ltd. (CATCo IM) and CATCo-Re Ltd. CATCo IM was a leading insurance-linked securities investment fund manager and reinsurance manager headquartered in Bermuda focused on building and managing highly diversified, collateralized retrocession and reinsurance portfolios covering global property catastrophe risks. Results attributable to Markel CATCo Investment Management Ltd. (MCIM), the wholly owned subsidiary formed in conjunction with this transaction, are included with the Company's non-insurance operations, which are not included in a reportable segment.

Total consideration for the acquisition was $205.7 million, all of which was cash. The purchase price was allocated to the acquired assets and liabilities based on estimated fair values at the acquisition date. The Company recognized goodwill of $91.9 million, all of which is expected to be deductible for income tax purposes. The goodwill is primarily attributable to the Company's ability to achieve continued capital growth in excess of that which can be expected for the investment funds previously managed by CATCo IM. The Company also recognized other intangible assets of $113.0 million, primarily related to its investment management agreements. These intangible assets are expected to be amortized over a weighted average period of 14 years.

In connection with the acquisition, the Company instituted performance incentive and retention arrangements for former CATCo employees, whom are now employed by MCIM. Pursuant to these agreements, the Company committed to the payment of performance bonuses derived from the results of the business in 2016 through 2018 and retention bonuses that will be paid annually over the three year period following the acquisition. The total amount of these payments is currently estimated to be $105 million, of which $33.2 million was recognized as compensation expense for the year ended December 31, 2016. The balance will be recognized in the consolidated financial statements as post-acquisition compensation expense over the remaining performance period and as services are provided.

Markel Ventures Acquisitions

In December 2015, the Company acquired 80% of the outstanding shares of CapTech Ventures, Inc. (CapTech), a privately held company headquartered in Richmond, Virginia. CapTech is a management and IT consulting firm, providing services and solutions to a wide array of customers. Under the terms of the acquisition agreement for CapTech, the Company has the option to acquire the remaining equity interests and the remaining equity interests have the option to sell their interests to the Company in the future. The redemption value of the remaining equity interests is generally based on CapTech's earnings in specified periods preceding the redemption date.

Total consideration for the CapTech acquisition was $60.6 million. Total consideration included the estimated fair value of contingent consideration we expected to pay based on CapTech's earnings, as defined in the stock purchase agreement, through 2018. The purchase price was preliminarily allocated to the acquired assets and liabilities based on the estimated fair values at the acquisition date. During 2016, the Company completed the process of determining the fair value of the assets and liabilities acquired with CapTech. There were no material adjustments to the provisional estimates recorded as of December 31, 2015. The Company recognized goodwill of $50.6 million related to this acquisition, none of which is expected to be deductible for income tax purposes. The Company also recognized other intangible assets of $49.2 million, primarily related to customer relationships, and redeemable noncontrolling interests of $13.8 million. These intangible assets are expected to be amortized over a weighted average period of 14 years. Results attributable to this acquisition are included with the Company's non-insurance operations, which are not included in a reportable segment.

In July 2014, the Company acquired 100% of the outstanding shares of Cottrell, Inc. (Cottrell), a privately held company headquartered in Gainesville, Georgia. Cottrell is a leading manufacturer of over-the-road car hauler equipment and related car hauler parts. In June and August 2014, ParkLand Ventures, Inc. (ParkLand) also completed the acquisition of several manufactured housing communities. Total consideration for these acquisitions was $187.0 million, which primarily consisted of cash consideration. Total consideration included the estimated fair value of contingent consideration we expected to pay based on Cottrell's earnings, as defined in the stock purchase agreement, in 2014 and 2015. The Company recognized goodwill of $38.7 million related to these acquisitions, the majority of which we expect to amortize for income tax purposes. The Company also recognized other intangible assets of $78.7 million, including $53.7 million of customer relationships and $13.0 million of trade names, which are expected to be amortized over a weighted average period of 17 years and 10 years, respectively. Results attributable to these acquisitions are included with the Company's non-insurance operations, which are not included in a reportable segment.

Acquisition of Abbey Protection

In January 2014, the Company completed its acquisition of 100% of the share capital of Abbey Protection plc (Abbey), an integrated specialty insurance and consultancy group headquartered in London. Abbey's business is focused on the underwriting and sale of insurance products to small and medium-sized enterprises and affinity groups in the United Kingdom providing protection against legal expenses and professional fees incurred as a result of legal actions or investigations by tax authorities, as well as providing a range of complementary legal and professional consulting services. Results attributable to Abbey's insurance operations are included in the International Insurance segment. Results attributable to Abbey's consultancy operations are reported with the Company's non-insurance operations, which are not included in a reportable segment.

Total consideration for this acquisition was $190.7 million, all of which was cash consideration. The purchase price was allocated to the acquired assets and liabilities based on estimated fair values at the acquisition date. The Company recognized goodwill of $65.8 million, of which $43.0 million was allocated to the International Insurance segment and $22.8 million was allocated to the Company's non-insurance operations. None of the goodwill recognized is expected to be deductible for income tax purposes. The goodwill is primarily attributable to Abbey's assembled workforce and synergies that are expected to result upon integration of Abbey into the Company's insurance operations. The Company also recognized other intangible assets of $113.4 million, including $103.5 million of customer relationships and $9.9 million of trade names. These intangible assets are expected to be amortized over 20 years and 14 years, respectively.

Subsequent Event

On February 1, 2017, the Company entered into a definitive merger agreement to acquire SureTec Financial Corp. (SureTec) for approximately $250 million. SureTec is a Texas-based privately held surety company primarily offering contract, commercial and court bonds. The transaction is subject to customary closing conditions, including insurance regulatory approvals, and is expected to close in the first half of 2017. Upon completion of the acquisition, SureTec's operating results will be included in the Company's U.S. Insurance segment.

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Investments

12 Months Ended

Dec. 31, 2016

Investments, Debt and Equity Securities [Abstract]

Investments

Investments

a)The following tables summarize the Company's available-for-sale investments. Commercial and residential mortgage-backed securities include securities issued by U.S. government-sponsored enterprises and U.S. government agencies.

	December 31, 2016
(dollars in thousands)	Amortized Cost		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses			Unrealized Other- Than-Temporary Impairment Losses			Estimated Fair Value
Fixed maturity securities:
U.S. Treasury	$	259,379	$	99	$	(894	)	$	—		$	258,584
U.S. government-sponsored enterprises	418,457		9,083		(4,328		)	—			423,212
Obligations of states, municipalities and political subdivisions	4,324,332		145,678		(41,805		)	—			4,428,205
Foreign governments	1,306,324		159,291		(2,153		)	—			1,463,462
Commercial mortgage-backed	1,055,947		3,953		(19,544		)	—			1,040,356
Residential mortgage-backed	779,503		18,749		(5,048		)	(2,258		)	790,946
Asset-backed	27,494		2		(158		)	—			27,338
Corporate	1,420,298		49,146		(9,364		)	(673		)	1,459,407
Total fixed maturity securities	9,591,734		386,001		(83,294		)	(2,931		)	9,891,510
Equity securities:
Insurance, banks and other financial institutions	846,343		857,063		(5,596		)	—			1,697,810
Industrial, consumer and all other	1,635,105		1,421,080		(8,154		)	—			3,048,031
Total equity securities	2,481,448		2,278,143		(13,750		)	—			4,745,841
Short-term investments	2,336,100		57		(6		)	—			2,336,151
Investments, available-for-sale	$	14,409,282	$	2,664,201	$	(97,050	)	$	(2,931	)	$	16,973,502
	December 31, 2015
(dollars in thousands)	Amortized Cost		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses			Unrealized Other- Than-Temporary Impairment Losses			Estimated Fair Value
Fixed maturity securities:
U.S. Treasury	$	310,370	$	95	$	(1,048	)	$	—		$	309,417
U.S. government-sponsored enterprises	385,282		9,741		(3,733		)	—			391,290
Obligations of states, municipalities and political subdivisions	3,817,136		204,302		(8,225		)	—			4,013,213
Foreign governments	1,302,329		115,809		(1,681		)	—			1,416,457
Commercial mortgage-backed	657,670		6,867		(4,999		)	—			659,538
Residential mortgage-backed	837,964		22,563		(4,022		)	(2,258		)	854,247
Asset-backed	36,462		15		(406		)	—			36,071
Corporate	1,690,945		41,123		(16,209		)	(1,624		)	1,714,235
Total fixed maturity securities	9,038,158		400,515		(40,323		)	(3,882		)	9,394,468
Equity securities:
Insurance, banks and other financial institutions	651,002		690,271		(6,551		)	—			1,334,722
Industrial, consumer and all other	1,557,832		1,227,052		(45,131		)	—			2,739,753
Total equity securities	2,208,834		1,917,323		(51,682		)	—			4,074,475
Short-term investments	1,642,103		167		(9		)	—			1,642,261
Investments, available-for-sale	$	12,889,095	$	2,318,005	$	(92,014	)	$	(3,882	)	$	15,111,204

b)The following tables summarize gross unrealized investment losses by the length of time that securities have continuously been in an unrealized loss position.

	December 31, 2016
	Less than 12 months					12 months or longer					Total
(dollars in thousands)	Estimated Fair Value		Gross  Unrealized Holding and  Other-Than- Temporary Impairment Losses			Estimated Fair Value		Gross  Unrealized Holding and  Other-Than- Temporary Impairment Losses			Estimated Fair Value		Gross  Unrealized Holding and  Other-Than- Temporary Impairment Losses
Fixed maturity securities:
U.S. Treasury	$	122,950	$	(894	)	$	—	$	—		$	122,950	$	(894	)
U.S. government-sponsored enterprises	220,333		(4,324		)	7,618		(4		)	227,951		(4,328		)
Obligations of states, municipalities and political subdivisions	1,004,947		(37,685		)	31,723		(4,120		)	1,036,670		(41,805		)
Foreign governments	68,887		(2,145		)	5,005		(8		)	73,892		(2,153		)
Commercial mortgage-backed	749,889		(19,091		)	29,988		(453		)	779,877		(19,544		)
Residential mortgage-backed	181,557		(4,987		)	79,936		(2,319		)	261,493		(7,306		)
Asset-backed	14,501		(106		)	5,869		(52		)	20,370		(158		)
Corporate	494,573		(8,357		)	93,790		(1,680		)	588,363		(10,037		)
Total fixed maturity securities	2,857,637		(77,589		)	253,929		(8,636		)	3,111,566		(86,225		)
Equity securities:
Insurance, banks and other financial institutions	8,808		(410		)	37,973		(5,186		)	46,781		(5,596		)
Industrial, consumer and all other	98,406		(4,772		)	29,650		(3,382		)	128,056		(8,154		)
Total equity securities	107,214		(5,182		)	67,623		(8,568		)	174,837		(13,750		)
Short-term investments	504,211		(6		)	—		—			504,211		(6		)
Total	$	3,469,062	$	(82,777	)	$	321,552	$	(17,204	)	$	3,790,614	$	(99,981	)

At December 31, 2016, the Company held 654 securities with a total estimated fair value of $3.8 billion and gross unrealized losses of $100.0 million. Of these 654 securities, 109 securities had been in a continuous unrealized loss position for one year or longer and had a total estimated fair value of $321.6 million and gross unrealized losses of $17.2 million. Of these securities, 93 securities were fixed maturity securities and 16 were equity securities. The Company does not intend to sell or believe it will be required to sell these fixed maturity securities before recovery of their amortized cost. The Company has the ability and intent to hold these equity securities for a period of time sufficient to allow for the anticipated recovery of their fair value.

	December 31, 2015
	Less than 12 months					12 months or longer					Total
(dollars in thousands)	Estimated Fair Value		Gross  Unrealized Holding and  Other-Than- Temporary Impairment Losses			Estimated Fair Value		Gross  Unrealized Holding and  Other-Than- Temporary Impairment Losses			Estimated Fair Value		Gross  Unrealized Holding and  Other-Than- Temporary Impairment Losses
Fixed maturity securities:
U.S. Treasury	$	301,300	$	(962	)	$	7,426	$	(86	)	$	308,726	$	(1,048	)
U.S. government-sponsored enterprises	125,703		(2,686		)	85,126		(1,047		)	210,829		(3,733		)
Obligations of states, municipalities and political subdivisions	169,362		(4,864		)	70,101		(3,361		)	239,463		(8,225		)
Foreign governments	51,328		(249		)	40,345		(1,432		)	91,673		(1,681		)
Commercial mortgage-backed	289,058		(3,600		)	95,843		(1,399		)	384,901		(4,999		)
Residential mortgage-backed	78,814		(2,858		)	137,100		(3,422		)	215,914		(6,280		)
Asset-backed	6,228		(54		)	24,315		(352		)	30,543		(406		)
Corporate	470,694		(9,509		)	343,737		(8,324		)	814,431		(17,833		)
Total fixed maturity securities	1,492,487		(24,782		)	803,993		(19,423		)	2,296,480		(44,205		)
Equity securities:
Insurance, banks and other financial institutions	63,873		(6,384		)	6,247		(167		)	70,120		(6,551		)
Industrial, consumer and all other	344,857		(44,879		)	2,907		(252		)	347,764		(45,131		)
Total equity securities	408,730		(51,263		)	9,154		(419		)	417,884		(51,682		)
Short-term investments	129,473		(9		)	—		—			129,473		(9		)
Total	$	2,030,690	$	(76,054	)	$	813,147	$	(19,842	)	$	2,843,837	$	(95,896	)

At December 31, 2015, the Company held 659 securities with a total estimated fair value of $2.8 billion and gross unrealized losses of $95.9 million. Of these 659 securities, 271 securities had been in a continuous unrealized loss position for one year or longer and had a total estimated fair value of $813.1 million and gross unrealized losses of $19.8 million. Of these securities, 264 securities were fixed maturity securities and seven were equity securities.

The Company completes a detailed analysis each quarter to assess whether the decline in the fair value of any investment below its cost basis is deemed other-than-temporary. All securities with unrealized losses are reviewed. The Company considers many factors in completing its quarterly review of securities with unrealized losses for other-than-temporary impairment, including the length of time and the extent to which fair value has been below cost and the financial condition and near-term prospects of the issuer. For equity securities, the ability and intent to hold the security for a period of time sufficient to allow for anticipated recovery is considered. For fixed maturity securities, the Company considers whether it intends to sell the security or if it is more likely than not that it will be required to sell the security before recovery, the implied yield-to-maturity, the credit quality of the issuer and the ability to recover all amounts outstanding when contractually due.

For equity securities, a decline in fair value that is considered to be other-than-temporary is recognized in net income based on the fair value of the security at the time of assessment, resulting in a new cost basis for the security. For fixed maturity securities where the Company intends to sell the security or it is more likely than not that the Company will be required to sell the security before recovery of its amortized cost, a decline in fair value is considered to be other-than-temporary and is recognized in net income based on the fair value of the security at the time of assessment, resulting in a new cost basis for the security. If the decline in fair value of a fixed maturity below its amortized cost is considered to be other-than-temporary based upon other considerations, the Company compares the estimated present value of the cash flows expected to be collected to the amortized cost of the security. The extent to which the estimated present value of the cash flows expected to be collected is less than the amortized cost of the security represents the credit-related portion of the other-than-temporary impairment, which is recognized in net income, resulting in a new cost basis for the security. Any remaining decline in fair value represents the non-credit portion of the other-than-temporary impairment, which is recognized in other comprehensive income (loss). The discount rate used to calculate the estimated present value of the cash flows expected to be collected is the effective interest rate implicit for the security at the date of purchase.

When assessing whether it intends to sell a fixed maturity or if it is likely to be required to sell a fixed maturity before recovery of its amortized cost, the Company evaluates facts and circumstances including decisions to reposition the investment portfolio, potential sales of investments to meet cash flow needs and, ultimately, current market prices.

c)The amortized cost and estimated fair value of fixed maturity securities at December 31, 2016 are shown below by contractual maturity.

(dollars in thousands)	Amortized Cost		Estimated Fair Value
Due in one year or less	$	798,529	$	800,733
Due after one year through five years	1,210,130		1,252,152
Due after five years through ten years	1,582,373		1,659,755
Due after ten years	4,137,758		4,320,230
	7,728,790		8,032,870
Commercial mortgage-backed	1,055,947		1,040,356
Residential mortgage-backed	779,503		790,946
Asset-backed	27,494		27,338
Total fixed maturity securities	$	9,591,734	$	9,891,510

Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties, and the lenders may have the right to put the securities back to the borrower. Based on expected maturities, the estimated average duration of fixed maturity securities at December 31, 2016 was 6.3 years.

d)The following table presents the components of net investment income.

	Years Ended December 31,
(dollars in thousands)	2016			2015			2014
Interest:
Municipal bonds (tax-exempt)	$	88,654		$	93,580		$	98,262
Municipal bonds (taxable)	65,749			57,550			49,345
Other taxable bonds	144,752			138,763			152,789
Short-term investments, including overnight deposits	11,177			5,223			5,959
Dividends on equity securities	70,577			74,705			65,031
Income (loss) from equity method investments	6,852			(262		)	4,766
Other	2,676			651			2,338
	390,437			370,210			378,490
Investment expenses	(17,207		)	(16,997		)	(15,260		)
Net investment income	$	373,230		$	353,213		$	363,230

e)Cumulative credit losses recognized in net income on fixed maturities where other-than-temporary impairment was identified and a portion of the other-than-temporary impairment was included in other comprehensive income (loss) were $10.7 million at December 31, 2016 and 2015 and $12.7 million at December 31, 2014.

f)The following table presents net realized investment gains and the change in net unrealized gains on investments.

	Years Ended December 31,
(dollars in thousands)	2016			2015			2014
Realized gains:
Sales of fixed maturity securities	$	5,160		$	3,073		$	8,417
Sales of equity securities	70,177			156,987			51,356
Other	1,415			8,103			15,205
Total realized gains	76,752			168,163			74,978
Realized losses:
Sales of fixed maturity securities	(704		)	(4,598		)	(18,136		)
Sales of equity securities	(6,988		)	(1,232		)	(802		)
Other-than-temporary impairments	(18,355		)	(44,481		)	(4,784		)
Other	(2,349		)	(486		)	(15,700		)
Total realized losses	(28,396		)	(50,797		)	(39,422		)
Gains (losses) on securities measured at fair value through net income	16,791			(10,886		)	10,444
Net realized investment gains	$	65,147		$	106,480		$	46,000
Change in net unrealized gains on investments included in other comprehensive income (loss):
Fixed maturity securities	$	(56,534	)	$	(137,435	)	$	480,350
Equity securities	398,752			(320,277		)	500,673
Short-term investments	(107		)	128			12
Net increase (decrease)	$	342,111		$	(457,584	)	$	981,035

g)The following table presents other-than-temporary impairment losses recognized in net income and included in net realized investment gains by investment type.

	Years Ended December 31,
(dollars in thousands)	2016			2015			2014
Fixed maturity securities:
Commercial mortgage-backed	$	—		$	—		$	(61	)
Asset-backed	—			—			(197		)
Corporate	—			—			(46		)
Total fixed maturity securities	—			—			(304		)
Equity securities:
Insurance, banks and other financial institutions	(7,586		)	(9,835		)	(341		)
Industrial, consumer and all other	(10,769		)	(34,646		)	(4,139		)
Total equity securities	(18,355		)	(44,481		)	(4,480		)
Total	$	(18,355	)	$	(44,481	)	$	(4,784	)

h)The following table presents the components of restricted assets.

	December 31,
(dollars in thousands)	2016		2015
Restricted assets held in trust or on deposit to support underwriting activities	$	4,059,336	$	4,037,458
Investments and cash and cash equivalents pledged as security for letters of credit	355,616		745,744
Total	$	4,414,952	$	4,783,202

Total restricted assets are included on the Company's consolidated balance sheets as follows.

	December 31,
(dollars in thousands)	2016		2015
Investments, available-for-sale	$	4,068,535	$	4,343,070
Restricted cash and cash equivalents	346,417		440,132
Total	$	4,414,952	$	4,783,202

i)At December 31, 2016 and 2015, investments in securities issued by the U.S. Treasury, U.S. government agencies and U.S. government-sponsored enterprises were the only investments in any one issuer that exceeded 10% of shareholders' equity.

At December 31, 2016, the Company's ten largest equity holdings represented $2.1 billion, or 44%, of the equity portfolio. Investments in the property and casualty insurance industry represented $1.0 billion, or 22%, of the equity portfolio at December 31, 2016. Investments in the property and casualty insurance industry included a $511.3 million investment in the common stock of Berkshire Hathaway Inc.

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Receivables

12 Months Ended

Dec. 31, 2016

Receivables [Abstract]

Receivables

Receivables

The following table presents the components of receivables.

	December 31,
(dollars in thousands)	2016			2015
Amounts receivable from agents, brokers and insureds	$	1,061,190		$	983,510
Trade accounts receivable	123,341			119,558
Investment management and performance fees receivable	38,735			—
Employee stock loans receivable (see note 12(c))	20,171			16,900
Other	10,122			6,165
	1,253,559			1,126,133
Allowance for doubtful receivables	(11,910		)	(12,430		)
Receivables	$	1,241,649		$	1,113,703

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Deferred Policy Acquisition Costs

12 Months Ended

Dec. 31, 2016

Deferred Policy Acquisition Costs Disclosures [Abstract]

Deferred Policy Acquisition Costs

Deferred Policy Acquisition Costs

The following table presents the amounts of policy acquisition costs deferred and amortized.

	Years Ended December 31,
(dollars in thousands)	2016			2015			2014
Balance, beginning of year	$	352,756		$	353,410		$	260,967
Policy acquisition costs deferred	823,840			752,324			754,303
Amortization of policy acquisition costs	(782,221		)	(744,964		)	(654,916		)
Foreign currency movements	(1,965		)	(8,014		)	(6,944		)
Deferred policy acquisition costs	$	392,410		$	352,756		$	353,410

The following table presents the components of underwriting, acquisition and insurance expenses.

	Years Ended December 31,
(dollars in thousands)	2016		2015		2014
Amortization of policy acquisition costs	$	782,221	$	744,964	$	654,916
Other operating expenses	716,369		710,116		805,966
Underwriting, acquisition and insurance expenses	$	1,498,590	$	1,455,080	$	1,460,882

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Property And Equipment

12 Months Ended

Dec. 31, 2016

Property, Plant and Equipment [Abstract]

Property And Equipment

Property and Equipment

The following table presents the components of property and equipment, which are included in other assets on the consolidated balance sheets.

	December 31,
(dollars in thousands)	2016			2015
Land	$	56,783		$	56,408
Buildings	76,159			77,488
Leasehold improvements	95,898			104,003
Land improvements	74,040			71,585
Furniture and equipment	301,146			291,736
Other	162,385			134,939
	766,411			736,159
Accumulated depreciation and amortization	(354,009		)	(305,324		)
Property and equipment	$	412,402		$	430,835

Depreciation and amortization expense of property and equipment was $64.8 million, $64.2 million and $51.2 million for the years ended December 31, 2016, 2015 and 2014, respectively.

The Company does not own any individually material properties. The Company leases substantially all of the facilities used by its insurance operations and certain furniture and equipment under operating leases. The Company leases offices for the U.S. Insurance segment in Glen Allen, Virginia and in 24 other locations; the Company leases offices for the International Insurance segment in London, England and in 29 other locations; and the Company leases offices for the Reinsurance segment primarily in Summit, New Jersey and Hamilton, Bermuda. The Company's Markel Ventures operations own certain of their office, clinic, manufacturing, warehouse and distribution facilities and lease others. The Company believes these facilities are suitable and adequate for the Company's insurance and non-insurance operations.

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Goodwill And Intangible Assets

12 Months Ended

Dec. 31, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill And Intangible Assets

Goodwill and Intangible Assets

The following table presents the components of goodwill by reportable segment.

(dollars in thousands)	U.S. Insurance		International Insurance			Reinsurance		Other(1)			Total
January 1, 2015	$	280,579	$	408,183		$	122,745	$	237,608		$	1,049,115
Acquisitions (see note 2)	—		—			—		146,659			146,659
Impairment loss	—		—			—		(14,880		)	(14,880		)
Foreign currency movements and other adjustments	—		(10,190		)	—		(2,860		)	(13,050		)
December 31, 2015 (2)	$	280,579	$	397,993		$	122,745	$	366,527		$	1,167,844
Impairment loss	—		—			—		(18,723		)	(18,723		)
Foreign currency movements and other adjustments	—		(5,809		)	—		(1,064		)	(6,873		)
December 31, 2016 (2)	$	280,579	$	392,184		$	122,745	$	346,740		$	1,142,248

⁽¹⁾  Amounts included in Other above are related to the Company's non-insurance operations, which are not included in a reportable segment.

⁽²⁾  Goodwill is net of accumulated impairment losses of $47.3 million and $28.6 million, as of December 31, 2016 and 2015, respectively, included in Other.

Goodwill and indefinite-lived intangible assets are tested for impairment at least annually. The Company completes an annual test during the fourth quarter of each year based upon the results of operations through September 30. As part of our annual impairment test, during the fourth quarter of 2016, the Company recorded a goodwill impairment charge of $18.7 million to other expenses for one of our Markel Ventures industrial manufacturing reporting units, to reduce the carrying value of its goodwill to its implied fair value. Unfavorable market conditions, specifically declining oil prices from late 2014 through 2016 resulted in lower than expected earnings over a similar time period. The reporting unit's earnings are generally tied to infrastructure spending across global markets, a significant portion of which are influenced by the price of oil. To determine the value of the impairment loss, the Company estimated the fair value of the reporting unit primarily using an income approach based on a discounted cash flow model. While these cash flow projections yield positive cash flows and earnings in the long-term, they were insufficient to support the current carrying value of the reporting unit due to the unfavorable impact of current market conditions and recent trends on our shorter-term projections. Following the impairment charge in 2016, the carrying value of the reporting unit's goodwill is zero.

During the fourth quarters of 2015 and 2014, the Company recorded goodwill impairment charges of $14.9 million and $13.7 million, respectively, to other expenses, for one of our Markel Ventures healthcare reporting units, to reduce the carrying value of its goodwill to its implied fair value. The reporting unit's operations consist of the planning, development and operation of behavioral health services in partnership with healthcare organizations and are reported in our non-insurance operations. In both periods, the Company determined the goodwill for the reporting unit was impaired as a result of lower than expected earnings and lower estimated future earnings. To determine the value of the impairment losses, the Company estimated the fair value of the reporting unit primarily using an income approach based on a discounted cash flow model. Following the impairment charge in 2015, the carrying value of the reporting unit's goodwill is zero.

The following table presents the components of intangible assets with a net carrying amount.

	December 31,
	2016					2015
(dollars in thousands)	Gross Carrying Amount		Accumulated Amortization			Gross Carrying Amount		Accumulated Amortization
Customer relationships	$	460,327	$	(119,376	)	$	481,547	$	(97,892	)
Broker relationships	183,092		(56,888		)	182,626		(45,135		)
Trade names	100,966		(29,745		)	103,681		(23,821		)
Investment management agreements	98,000		(7,000		)	98,000		—
Technology	54,408		(28,220		)	54,241		(22,288		)
Insurance licenses	30,185		—			30,185		—
Lloyd's syndicate capacity	12,000		—			12,000		—
Other	34,172		(9,379		)	30,496		(11,268		)
Total	$	973,150	$	(250,608	)	$	992,776	$	(200,404	)

Amortization of intangible assets was $68.5 million, $68.9 million and $57.6 million for the years ended December 31, 2016, 2015 and 2014, respectively. Amortization of intangible assets is estimated to be $67.4 million for 2017, $66.0 million for 2018, $58.0 million for 2019, $51.6 million for 2020 and $50.0 million for 2021. Indefinite-lived intangible assets were $48.2 million at December 31, 2016 and December 31, 2015.

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Income Taxes

12 Months Ended

Dec. 31, 2016

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

Income before income taxes includes the following components.

	Years Ended December 31,
(dollars in thousands)	2016		2015		2014
Domestic operations	$	288,905	$	323,954	$	240,279
Foreign operations	341,015		418,151		200,099
Income before income taxes	$	629,920	$	742,105	$	440,378

Income tax expense includes the following components.

	Years Ended December 31,
(dollars in thousands)	2016		2015			2014
Current:
Domestic	$	57,916	$	44,406		$	7,573
Foreign	48,203		118,235			24,574
Total current tax expense	106,119		162,641			32,147
Deferred:
Domestic	19,991		9,415			43,673
Foreign	43,367		(19,093		)	40,870
Total deferred tax expense (benefit)	63,358		(9,678		)	84,543
Income tax expense	$	169,477	$	152,963		$	116,690

Foreign income tax expense includes United States income tax expense on foreign operations, which includes United States income tax on the Company's Bermuda-based operations, certain of which have elected to be taxed as domestic corporations for United States tax purposes.

State income tax expense is not material to the consolidated financial statements.

The Company made income tax payments of $142.2 million, $132.5 million and $89.5 million in 2016, 2015 and 2014, respectively. Current income taxes payable were $46.4 million and $63.5 million at December 31, 2016 and 2015, respectively, and were included in other liabilities on the consolidated balance sheets.

Reconciliations of the United States corporate income tax rate to the effective tax rate on income before income taxes are presented in the following table.

	Years Ended December 31,
	2016		2015		2014
United States corporate tax rate	35	%	35	%	35	%
Tax-exempt investment income	(6	)	(5	)	(9	)
Foreign tax credits	(2	)	(8	)	(1	)
Foreign operations	1		(1	)	—
Other	(1	)	—		1
Effective tax rate	27	%	21	%	26	%

The 2015 effective tax rate included an 8% income tax benefit related to tax credits for foreign taxes paid. In previous periods, certain foreign taxes paid were not available for use as tax credits against the Company's United States provision for income taxes. Based on the Company's earnings from foreign operations in 2015, significant foreign taxes paid, both in 2015 and prior periods, were used as credits against its United States provision for income taxes in 2015. Foreign tax credits of the magnitude recognized in 2015 are not expected in future periods.

The following table presents the components of domestic and foreign deferred tax assets and liabilities.

	December 31,
(dollars in thousands)	2016			2015
Assets:
Unpaid losses and loss adjustment expenses	$	181,303		$	212,012
Life and annuity benefits	135,075			156,950
Unearned premiums recognized for income tax purposes	121,852			102,076
Accrued incentive compensation	67,719			53,586
Investments, including other-than-temporary impairments	58,248			65,641
Net operating loss carryforwards	26,743			18,771
Tax credit carryforwards	23,037			18,158
Stock-based compensation	19,235			21,948
Other differences between financial reporting and tax bases	44,942			40,497
Total gross deferred tax assets	678,154			689,639
Less valuation allowance	(18,781		)	(5,131		)
Total gross deferred tax assets, net of allowance	659,373			684,508
Liabilities:
Net unrealized gains on investments	723,198			626,776
Deferred policy acquisition costs	128,302			88,036
Amortization of goodwill and other intangible assets	102,631			107,271
Other differences between financial reporting and tax bases	35,727			38,613
Total gross deferred tax liabilities	989,858			860,696
Net deferred tax liability	$	330,485		$	176,188

The net deferred tax liability at December 31, 2016 and 2015 was included in other liabilities on the consolidated balance sheets.

At December 31, 2016, the Company had tax credit carryforwards of $23.0 million. The earliest any of these credits will expire is 2025.

At December 31, 2016, the Company had net operating losses of $12.6 million that can be used to offset future taxable income in the United States from Markel Capital Limited, a wholly owned United Kingdom subsidiary. The Company's ability to use these losses in the United States expires between the years 2023 and 2033. At December 31, 2016, the Company also had net operating losses of $18.1 million that can be used to offset other future taxable income in the United States. The Company's ability to use these losses in the United States expires between the years 2028 and 2030. At December 31, 2016, certain branch operations in Europe and a wholly owned subsidiary in Brazil had net operating losses of $81.7 million that can be used to offset future income in their local jurisdictions. The Company's ability to use $20.4 million of these losses expires between the years 2020 and 2025. The remaining losses are not subject to expiration. As discussed below, the deferred tax assets related to losses at the Company's European branches and Brazilian subsidiary are offset by valuation allowances.

The Company believes that it is more likely than not that it will realize $659.4 million of gross deferred tax assets, including net operating losses at December 31, 2016, through generating taxable income or the reversal of existing temporary differences attributable to the gross deferred tax liabilities. As a result of cumulative net operating losses in certain jurisdictions, the Company has a valuation allowance of $18.8 million at December 31, 2016 that offsets the deferred tax assets primarily related to losses incurred at European branches of one of the Company's wholly owned United Kingdom subsidiaries and at one of the Company's Brazilian subsidiaries.

At December 31, 2016, the Company had unrecognized tax benefits of $8.9 million. If recognized, $8.6 million of these tax benefits would decrease the annual effective tax rate. The Company does not currently anticipate any changes in unrecognized tax benefits during 2017 that would have a material impact on the Company's income tax provision.

The following table presents a reconciliation of unrecognized tax benefits.

	Years Ended December 31,
(dollars in thousands)	2016			2015
Unrecognized tax benefits, beginning of year	$	15,324		$	17,700
Decreases for tax positions taken in prior years	—			(146		)
Lapse of statute of limitations	(6,448		)	(606		)
Settlement with taxing authorities	—			(1,624		)
Unrecognized tax benefits, end of year	$	8,876		$	15,324

With the exception of certain of our Bermuda subsidiaries, at December 31, 2016, earnings of the Company's foreign subsidiaries not previously taxed in the United States are considered reinvested indefinitely and no provision for deferred United States income taxes has been recorded. If the Company's intentions with respect to reinvestment were to change, and earnings were to be repatriated to the United States, these foreign subsidiaries would be subject to tax in the United States less applicable foreign tax credits. As of December 31, 2016, cumulative earnings of our foreign subsidiaries that are considered reinvested indefinitely and have not previously been subject to tax in the United States totaled approximately $615 million.

The Company is subject to income tax in the United States and in foreign jurisdictions. With few exceptions, the Company is no longer subject to income tax examination by tax authorities for years ended before January 1, 2013. During the first quarter of 2016, the Internal Revenue Service completed its examination of the Company's 2012 United States federal income tax return. There were no adjustments to the Company's income tax liabilities as a result of this examination.

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Unpaid Losses And Loss Adjustment Expenses

12 Months Ended

Dec. 31, 2016

Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]

Unpaid Losses And Loss Adjustment Expenses

Unpaid Losses and Loss Adjustment Expenses

a)The following table presents a reconciliation of consolidated beginning and ending reserves for losses and loss adjustment expenses. In 2016, incurred losses and loss adjustment expenses in the following table exclude $11.7 million of favorable development on prior years loss reserves included in losses and loss adjustment expenses on the consolidated statement of income and other comprehensive income (loss) related to the commutation of a property and casualty deposit contract, for which the underlying deposit liability was included in other liabilities on the consolidated balance sheet as of December 31, 2015, rather than unpaid losses and loss adjustment expenses.

	Years Ended December 31,
(dollars in thousands)	2016			2015			2014
Net reserves for losses and loss adjustment expenses, beginning of year	$	8,235,288		$	8,535,483		$	8,407,642
Foreign currency movements	(129,692		)	(134,173		)	(137,385		)
Adjusted net reserves for losses and loss adjustment expenses, beginning of year	8,105,596			8,401,310			8,270,257
Incurred losses and loss adjustment expenses:
Current year	2,555,902			2,566,545			2,638,012
Prior years	(493,495		)	(627,800		)	(435,545		)
Total incurred losses and loss adjustment expenses	2,062,407			1,938,745			2,202,467
Payments:
Current year	532,140			486,551			502,107
Prior years	1,529,206			1,423,286			1,436,851
Total payments	2,061,346			1,909,837			1,938,958
Effect of foreign currency rate changes	2,060			(17,281		)	(19,476		)
Net reserves for losses and loss adjustment expenses of acquired insurance companies	—			—			21,193
Reinsurance recoverable on retroactive reinsurance transactions	—			(177,649		)	—
Net reserves for losses and loss adjustment expenses, end of year	8,108,717			8,235,288			8,535,483
Reinsurance recoverable on unpaid losses	2,006,945			2,016,665			1,868,669
Gross reserves for losses and loss adjustment expenses, end of year	$	10,115,662		$	10,251,953		$	10,404,152

On March 9, 2015, the Company completed a retroactive reinsurance transaction to cede a portfolio of policies primarily comprised of liabilities arising from asbestos and environmental (A&E) exposures that originated before 1992 in exchange for payments totaling $89.0 million, which included cash paid at closing of $69.9 million. At the time of the transaction, reserves for unpaid losses and loss adjustment expenses on the policies ceded totaled $94.1 million, resulting in a deferred gain of $5.1 million which will be recognized in earnings in proportion to actual reinsurance recoveries received pursuant to the transaction.

On October 30, 2015, the Company completed a second retroactive reinsurance transaction to cede a portfolio of policies primarily comprised of liabilities arising from A&E exposures that originated before 1987 in exchange for cash payments totaling $86.5 million. The transaction provides up to $300 million of coverage for losses in excess of a $97.0 million retention on the ceded policies and 50% coverage on an additional $100 million of losses. The transaction is effective as of January 1, 2015, at which time reserves for unpaid losses and loss adjustment expenses on the policies ceded totaled $173.4 million. After considering the Company's retention on the ceded policies, ceded reserves for unpaid losses and loss adjustment expenses totaled $76.4 million, resulting in an underwriting loss of $10.1 million on the transaction.

In 2016, incurred losses and loss adjustment expenses included $493.5 million of favorable development on prior years' loss reserves, which was due in part to $418.0 million of loss reserve redundancies on our long-tail casualty lines within the U.S. Insurance and International Insurance segments, our marine and energy product lines within the International Insurance segment, and our property product lines in the U.S. Insurance and Reinsurance segments, as actual claims reporting and development patterns on prior accident years have been more favorable than the Company's actuarial analyses initially anticipated. Redundancies in 2016 were partially offset by $71.2 million of adverse development on our specified medical and medical malpractice product lines within the U.S. Insurance segment.

In 2015, incurred losses and loss adjustment expenses included $627.8 million of favorable development on prior years' loss reserves, which was due in part to $375.8 million of loss reserve redundancies on our general liability, workers' compensation, inland marine and brokerage property product lines within the U.S. Insurance segment and on our general liability, professional liability and marine and energy product lines within the International Insurance segment, as actual claims reporting patterns on prior accident years have been more favorable than the Company's actuarial analyses initially anticipated.

In 2015, incurred losses and loss adjustment expenses also included $82.7 million of favorable development on prior years' loss reserves attributable to a decrease in the estimated volatility of our consolidated net reserves for unpaid losses and loss adjustment expenses as a result of ceding a significant portion of the Company's A&E exposures to a third party during 2015, as described above. As a result of this decrease in estimated volatility, the level of confidence in the Company's net reserves for unpaid losses and loss adjustment expenses increased. Therefore, management reduced prior years' loss reserves by $82.7 million in order to maintain a consolidated confidence level in a range consistent with the Company's historic levels. This reduction in prior years' loss reserves occurred across all three of the Company's ongoing underwriting segments.

The favorable development on prior years' loss reserves in 2015 was partially offset by $25.4 million of adverse development on prior years' loss reserves for A&E exposures, of which $7.1 million is attributable to the underwriting loss on the retroactive reinsurance transaction described above. Following the October 2015 retroactive reinsurance transaction, the Company's actuaries increased their estimate of the ultimate losses on the remaining A&E claims and management increased prior years' loss reserves by $15.0 million. Without the diversification of a larger portfolio of loss reserves, there is greater uncertainty around the potential outcomes of the remaining claims, and management strengthened reserves accordingly.

In 2014, the Company recorded net reserves for losses and loss adjustment expenses of $21.2 million as a result of the acquisition of Abbey. These reserves were recorded at fair value as part of the Company's purchase accounting.

In 2014, incurred losses and loss adjustment expenses included $435.5 million of favorable development on prior years' loss reserves, which was due in part to $250.4 million of loss reserve redundancies on our long-tail casualty and professional liability lines within the U.S. Insurance segment and on our professional liability and marine and energy product lines within the International Insurance segment, as actual claims reporting patterns on prior accident years have been more favorable than the Company's actuarial analyses initially anticipated. The favorable development on prior years' loss reserves in 2014 was partially offset by $32.8 million of adverse development in prior years' loss reserves on A&E exposures.

Once a year, generally during the third quarter, the Company completes an in-depth, actuarial review of its A&E exposures. During the annual review for 2014, the Company increased its expectation of the severity of the outcome of certain claims subject to litigation. As the ultimate outcome of known claims increases, the Company's expected ultimate closure value on unreported claims also increases. As a result, prior years' loss reserves for A&E exposures were increased by $27.2 million in 2014. During the annual review for both 2016 and 2015, the Company determined that no adjustment to loss reserves was required.

The Company uses a variety of techniques to establish the liabilities for unpaid losses and loss adjustment expenses based upon estimates of the ultimate amounts payable. The Company maintains reserves for specific claims incurred and reported (case reserves) and reserves for claims incurred but not reported (IBNR reserves), which include expected development on reported claims. The Company does not discount its reserves for losses and loss adjustment expenses to reflect estimated present value, except for reserves assumed in connection with an acquisition, which are recorded at fair value at the acquisition date. The fair value adjustment includes an adjustment to reflect the acquired reserves for losses and loss adjustment expenses at present value plus a risk premium, the net of which is amortized to losses and loss adjustment expenses within the consolidated statements of income. The amount of unamortized fair value adjustments included in unpaid losses and loss adjustment expenses as of December 31, 2016 and 2015 was $68.9 million and $91.0 million, respectively.

As of any balance sheet date, all claims have not yet been reported, and some claims may not be reported for many years. As a result, the liability for unpaid losses and loss adjustment expenses includes significant estimates for incurred but not reported claims.

There is normally a time lag between when a loss event occurs and when it is actually reported to the Company. The actuarial methods that the Company uses to estimate losses have been designed to address the lag in loss reporting as well as the delay in obtaining information that would allow the Company to more accurately estimate future payments. There is also a time lag between cedents establishing case reserves and re-estimating their reserves, and notifying the Company of the new or revised case reserves. As a result, the reporting lag is more pronounced in reinsurance contracts than in the insurance contracts due to the reliance on ceding companies to report their claims. On reinsurance transactions, the reporting lag will generally be 60 to 90 days after the end of a reporting period, but can be longer in some cases. Based on the experience of the Company's actuaries and management, loss development factors and trending techniques are selected to mitigate the difficulties caused by reporting lags. The loss development and trending factor selections are evaluated at least annually and updated using cedent specific and industry data.

IBNR reserves are based on the estimated ultimate cost of settling claims, including the effects of inflation and other social and economic factors, using past experience adjusted for current trends and any other factors that would modify past experience. IBNR reserves, which include expected development on reported claims, are generally calculated by subtracting paid losses and loss adjustment expenses and case reserves from estimated ultimate losses and loss adjustment expenses. IBNR reserves were 67% of total unpaid losses and loss adjustment expenses at December 31, 2016 compared to 65% at December 31, 2015

In establishing liabilities for unpaid losses and loss adjustment expenses, the Company's actuaries estimate an ultimate loss ratio, by accident year or policy year, for each product line with input from underwriting and claims associates. For product lines in which loss reserves are established on a policy year basis, the Company has developed a methodology to convert from policy year to accident year for financial reporting purposes. In estimating an ultimate loss ratio for a particular line of business, the actuaries may use one or more actuarial reserving methods and select from these a single point estimate. To varying degrees, these methods include detailed statistical analysis of past claim reporting, settlement activity, claim frequency and severity, policyholder loss experience, industry loss experience and changes in market conditions, policy forms and exposures. Greater judgment may be required when new product lines are introduced or when there have been changes in claims handling practices, as the statistical data available may be insufficient. These estimates also reflect implicit and explicit assumptions regarding the potential effects of external factors, including economic and social inflation, judicial decisions, changes in law, general economic conditions and recent trends in these factors. Management believes the process of evaluating past experience, adjusted for the effects of current developments and anticipated trends, is an appropriate basis for predicting future events.

Loss reserves are established at management's best estimate, which is generally higher than the corresponding actuarially calculated point estimate. The actuarial point estimate represents the actuaries' estimate of the most likely amount that will ultimately be paid to settle the loss reserves that are recorded at a particular point in time; however, there is inherent uncertainty in the point estimate as it is the expected value in a range of possible reserve estimates. In some cases, actuarial analyses, which are based on statistical analysis, cannot fully incorporate all of the subjective factors that affect development of losses. In other cases, management's perspective of these more subjective factors may differ from the actuarial perspective. Subjective factors where management's perspective may differ from that of the actuaries include: the credibility and timeliness of claims information received from third parties, economic and social inflation, judicial decisions, changes in law, changes in underwriting or claims handling practices, general economic conditions, the risk of moral hazard and other current and developing trends within the insurance and reinsurance markets, including the effects of competition. As a result, the actuarially calculated point estimates for each of line of business represents starting points for management's quarterly review of loss reserves.

Inherent in the Company's reserving practices is the desire to establish loss reserves that are more likely redundant than deficient. As such, the Company seeks to establish loss reserves that will ultimately prove to be adequate. As part of the Company's acquisition of insurance operations, to the extent the reserving philosophy of the acquired business differs from the Company's reserving philosophy, the post-acquisition loss reserves will be strengthened until total loss reserves are consistent with the Company's target level of confidence. Furthermore, the Company's philosophy is to price its insurance products to make an underwriting profit. Management continually attempts to improve its loss estimation process by refining its ability to analyze loss development patterns, claim payments and other information, but uncertainty remains regarding the potential for adverse development of estimated ultimate liabilities.

Following the completion of two retroactive reinsurance transactions in 2015, the Company has less variability in its consolidated loss reserves. Additionally, management continues to gain confidence in the actuarial projections on product lines previously written by Alterra Capital Holdings Limited (Alterra), which we acquired in 2013.  As a result, management's best estimate of the current accident year ultimate loss ratios on various product lines across all three of the Company's ongoing underwriting segments decreased in 2016 compared to 2015.

Management currently believes the Company's gross and net reserves are adequate. However, there is no precise method for evaluating the impact of any significant factor on the adequacy of reserves, and actual results will differ from original estimates.

b)The following tables present loss development information, by accident year, for the Company's U.S. Insurance, International Insurance and Reinsurance segments, including cumulative incurred and paid losses and allocated loss adjustment expenses, net of reinsurance, as well as the corresponding amount of IBNR reserves as of December 31, 2016. This level of disaggregation is consistent with how the Company analyzes loss reserves for both internal and external reporting purposes. The loss development information for the years ended December 31, 2012 through 2015 is presented as supplementary information. For the Company's U.S. Insurance segment, the years presented in the tables comprise the majority of the period for which incurred losses typically remain outstanding. Incurred losses in the Company's International Insurance and Reinsurance segments, which generally include a larger proportion of long-tail business than the U.S. Insurance segment, generally remain outstanding more than five years; however, data prior to 2012 is not practically available by segment as a result of a change in the Company's reportable segments in 2014, which was most impactful on these two segments. Additionally, reserves for our international operations within these two segments are determined on a policy year basis and historical data prior to 2012 does not exist by accident year. All amounts included in the tables below related to transactions denominated in a foreign currency have been translated into United States Dollars using the exchange rates in effect at December 31, 2016.

The tables below also include claim frequency information, by accident year, for each of the segments presented. The Company defines a claim as a single claim incident, per policy, which may include multiple claimants and multiple coverages on a single policy. Claim counts include claims closed without a payment as well as claims where the Company is monitoring to determine if an exposure exists, even if a reserve has not been established.

In 2013, the Company completed the acquisition of Alterra, the results of which are included in each of the Company's reportable segments. Ultimate incurred losses and loss adjustment expenses, net of reinsurance for the year ended December 31, 2013 include outstanding liabilities for losses and loss adjustment expenses of Alterra as of the acquisition date, by accident year and not in any prior periods. Pre-acquisition data is not available by segment and accident year as a result of changes to the historical Alterra product line reporting structure that impacted each of the Company's reportable segments and the impact of significant intercompany reinsurance contracts. Additionally, Alterra reserves were historically determined on a policy year basis and pre-acquisition data does not exist in a format that can be used to determine accident year and segment. Following the acquisition, ongoing business attributable to Alterra was integrated with the Company's other insurance operations and is not separately tracked.

U.S. Insurance Segment

	Ultimate Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance										Total of Incurred-but-Not-Reported Liabilities, Net of Reinsurance		Cumulative Number of Reported Claims
	Unaudited								Year Ended December 31,
(in thousands)	Years Ended December 31,
Accident Year	2012		2013		2014		2015		2016		December 31, 2016
2012	$	949,141	$	985,721	$	924,138	$	924,621	$	909,237	$	117,333	106
2013			1,130,681		1,105,927		1,042,100		1,009,438		175,309		65
2014					1,278,116		1,140,685		1,116,093		290,827		56
2015							1,285,411		1,211,389		500,705		55
2016									1,319,731		781,984		49
Total									$	5,565,888
	Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance
	Unaudited								Year Ended December 31,
	Years Ended December 31,
Accident Year	2012		2013		2014		2015		2016
2012	$	193,708	$	401,773	$	546,635	$	644,658	$	728,802
2013			222,890		443,392		594,558		725,782
2014					264,697		487,068		650,118
2015							260,121		514,497
2016									278,650
Total									$	2,897,849
All outstanding liabilities for unpaid losses and loss adjustment expenses before 2012, net of reinsurance									402,534
Total liabilities for unpaid losses and loss adjustment expenses, net of reinsurance									$	3,070,573

Ultimate incurred losses and allocated loss adjustment expenses for the year ended December 31, 2013 for the U.S. Insurance segment include $97.4 million and $149.9 million of losses and loss adjustment expenses on the 2012 and 2013 accident years, respectively, attributable to Alterra. Cumulative paid losses and allocated loss adjustment expenses for the year ended December 31, 2013 include $22.6 million and $23.2 million of paid losses and allocated loss adjustment expenses on the 2012 and 2013 accident years, respectively, attributable to the acquired Alterra reserves and post-acquisition Alterra business. Cumulative paid losses and allocated loss adjustment expenses and cumulative reported claims for the 2012 and 2013 accident years exclude any claims paid or closed prior to the acquisition.

Cumulative reported claims for the 2012 and 2013 accident years include 65 thousand and 16 thousand, respectively, of claim counts associated with a personal lines product with high claim frequency and low claim severity that the Company stopped writing in 2013. The related net incurred losses and allocated loss adjustment expenses are not material to the U.S. Insurance segment.

International Insurance Segment

	Ultimate Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance										Total of Incurred-but-Not-Reported Liabilities, Net of Reinsurance		Cumulative Number of Reported Claims
	Unaudited								Year Ended December 31,
(in thousands)	Years Ended December 31,
Accident Year	2012		2013		2014		2015		2016		December 31, 2016
2012	$	412,684	$	616,641	$	557,604	$	495,641	$	479,558	$	87,383	18
2013			597,145		581,164		476,433		446,568		155,062		17
2014					577,454		545,954		502,708		149,455		16
2015							488,649		489,119		222,864		16
2016									543,959		279,320		13
Total									$	2,461,912
	Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance
	Unaudited								Year Ended December 31,
	Years Ended December 31,
Accident Year	2012		2013		2014		2015		2016
2012	$	38,992	$	163,805	$	230,882	$	289,517	$	319,843
2013			47,887		126,699		182,173		220,625
2014					65,683		167,568		240,050
2015							61,556		148,037
2016									92,665
Total									$	1,021,220
All outstanding liabilities for unpaid losses and loss adjustment expenses before 2012, net of reinsurance									570,940
Total liabilities for unpaid losses and loss adjustment expenses, net of reinsurance									$	2,011,632

Ultimate incurred losses and allocated loss adjustment expenses for the year ended December 31, 2013 for the International Insurance segment include $158.0 million and $162.7 million of losses and loss adjustment expenses on the 2012 and 2013 accident years, respectively, attributable to Alterra. Cumulative paid losses and allocated loss adjustment expenses for the year ended December 31, 2013 include $14.0 million and $6.2 million of paid losses and allocated loss adjustment expenses on the 2012 and 2013 accident years, respectively, attributable to the acquired Alterra reserves and post-acquisition Alterra business. Cumulative paid losses and allocated loss adjustment expenses and cumulative reported claims for the 2012 and 2013 accident years exclude any claims paid or closed prior to the acquisition.

Business contained within the Company's International Insurance segment includes business managed by other managing agents, coverholders and third party administrators, for which the Company is unable to obtain access to the underlying claim counts. As such, the claim count information for this business has been excluded from the total claim counts reported above. This business represents 4% of the cumulative incurred losses and allocated loss adjustment expenses, net of reinsurance, on the 2012 through 2016 accident years detailed above.

Reinsurance Segment

	Ultimate Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance										Total of Incurred-but-Not-Reported Liabilities, Net of Reinsurance
	Unaudited								Year Ended December 31,
(in thousands)	Years Ended December 31,
Accident Year	2012		2013		2014		2015		2016		December 31, 2016
2012	$	72,250	$	545,939	$	503,410	$	482,836	$	455,103	$	137,778
2013			581,963		574,760		545,743		531,955		179,519
2014					575,479		565,252		536,274		209,246
2015							526,286		511,959		306,717
2016									529,518		382,407
Total									$	2,564,809
	Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance
	Unaudited								Year Ended December 31,
	Years Ended December 31,
Accident Year	2012		2013		2014		2015		2016
2012	$	3,955	$	64,209	$	128,174	$	183,321	$	230,742
2013			71,182		154,494		209,256		268,052
2014					97,617		158,104		228,293
2015							63,963		134,530
2016									79,481
Total									$	941,098
All outstanding liabilities for unpaid losses and loss adjustment expenses before 2012, net of reinsurance									840,563
Total liabilities for unpaid losses and loss adjustment expenses, net of reinsurance									$	2,464,274

Ultimate incurred losses and allocated loss adjustment expenses for the year ended December 31, 2013 for the Reinsurance segment include $471.0 million and $531.8 million of losses and loss adjustment expenses on the 2012 and 2013 accident years, respectively, attributable to Alterra. Cumulative paid losses and allocated loss adjustment expenses for the year ended December 31, 2013 include $52.4 million and $68.6 million of paid losses and allocated loss adjustment expenses on the 2012 and 2013 accident years, respectively, attributable to the acquired Alterra reserves and post-acquisition Alterra business. Cumulative paid losses and allocated loss adjustment expenses for the 2012 and 2013 accident years exclude any claims paid prior to the acquisition.

All of the business contained within the Company's Reinsurance segment represents treaty business that is assumed from other insurance or reinsurance companies, for which the Company does not have access to the underlying claim counts. Further, this business includes both quota share and excess of loss treaty reinsurance, through which only a portion of each reported claim results in losses to the Company. As such, the Company has excluded claim count information from the Reinsurance segment disclosures.

The following table presents supplementary information about average historical claims duration as of December 31, 2016 based on the cumulative incurred and paid losses and allocated loss adjustment expenses presented above.

	Average Annual Percentage Payout of Incurred Losses by Age (in Years), Net of Reinsurance
Unaudited	1		2		3		4		5
U.S. Insurance	21.9	%	21.4	%	15.2	%	11.9	%	9.3	%
International Insurance	12.3	%	20.4	%	13.6	%	10.4	%	6.3	%
Reinsurance	12.0	%	13.5	%	12.5	%	11.6	%	10.4	%

The following table reconciles the net incurred and paid loss development tables, by segment, to the liability for losses and loss adjustment expenses in the consolidated balance sheet.

(dollars in thousands)	December 31, 2016
Net outstanding liabilities
U.S. Insurance	$	3,070,573
International Insurance	2,011,632
Reinsurance	2,464,274
Other Insurance (Discontinued Lines)	281,562
Liabilities for unpaid losses and loss adjustment expenses, net of reinsurance	7,828,041
Reinsurance recoverable on unpaid losses
U.S. Insurance	631,608
International Insurance	982,127
Reinsurance	140,629
Other Insurance (Discontinued Lines)	252,581
Total reinsurance recoverable on unpaid losses	2,006,945
Unallocated loss adjustment expenses	211,777
Unamortized fair value adjustments on acquired reserves for losses and loss adjustment expenses	68,899
	280,676
Total gross liability for unpaid losses and loss adjustment expenses	$	10,115,662

c)The Company's exposure to A&E claims results from policies written by acquired insurance operations before their acquisition by the Company. The Company's exposure to A&E claims originated from umbrella, excess and commercial general liability (CGL) insurance policies and assumed reinsurance contracts that were written on an occurrence basis from the 1970s to mid-1980s. Exposure also originated from claims-made policies that were designed to cover environmental risks provided that all other terms and conditions of the policy were met.

A&E claims include property damage and clean-up costs related to pollution, as well as personal injury allegedly arising from exposure to hazardous materials. After 1986, the Company began underwriting CGL coverage with pollution exclusions, and in some lines of business the Company began using a claims-made form. These changes significantly reduced the Company's exposure to future A&E claims on post-1986 business.

The following table provides a reconciliation of beginning and ending A&E reserves for losses and loss adjustment expenses, which are a component of consolidated unpaid losses and loss adjustment expenses. Amounts included in the following table are presented before consideration of reinsurance allowances.

	Years Ended December 31,
(dollars in thousands)	2016			2015			2014
Net reserves for A&E losses and loss adjustment expenses, beginning of year	$	132,869		$	287,723		$	272,194
Incurred losses and loss adjustment expenses	(5,277		)	25,415			32,840
Payments	(15,988		)	(20,628		)	(17,311		)
Reinsurance recoverable on retroactive reinsurance transactions	—			(159,641		)	—
Net reserves for A&E losses and loss adjustment expenses, end of year	111,604			132,869			287,723
Reinsurance recoverable on unpaid losses	212,300			253,756			102,719
Gross reserves for A&E losses and loss adjustment expenses, end of year	$	323,904		$	386,625		$	390,442

At December 31, 2016, asbestos-related reserves were $252.1 million and $90.0 million on a gross and net basis, respectively. Net reserves for reported claims for A&E exposures were $104.1 million at December 31, 2016. Net incurred but not reported reserves for A&E exposures were $7.5 million at December 31, 2016. Inception-to-date net paid losses and loss adjustment expenses for A&E related exposures totaled $612.0 million at December 31, 2016, which includes $159.6 million of payments for two retroactive reinsurance transactions completed in 2015 and $93.6 million of litigation-related expense. As previously described, during 2015, the Company completed two retroactive reinsurance transactions to cede two portfolios of policies primarily comprised of liabilities arising from A&E exposures. At the time of the transactions, the reinsurance recoverable for the retroactive reinsurance coverages totaled $177.6 million, of which $159.6 million was attributable to A&E exposures.

The Company's reserves for losses and loss adjustment expenses related to A&E exposures represent management's best estimate of ultimate settlement values. A&E reserves are monitored by management, and the Company's statistical analysis of these reserves is reviewed by the Company's independent actuaries. A&E exposures are subject to significant uncertainty due to potential loss severity and frequency resulting from the uncertain and unfavorable legal climate. A&E reserves could be subject to increases in the future; however, management believes the Company's gross and net A&E reserves at December 31, 2016 are adequate.

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Life And Annuity Benefits

12 Months Ended

Dec. 31, 2016

Liability for Future Policy Benefits [Abstract]

Life And Annuity Benefits

Life and Annuity Benefits

The following table presents life and annuity benefits.

	December 31,
(dollars in thousands)	2016		2015
Life	$	131,768	$	142,068
Annuities	849,226		901,218
Accident and health	68,660		79,989
Total	$	1,049,654	$	1,123,275

Life and annuity benefits are compiled on a reinsurance contract-by-contract basis and are discounted using standard actuarial techniques and cash flow models. Since the development of the life and annuity reinsurance reserves is based upon cash flow projection models, the Company must make estimates and assumptions based on cedent experience, industry mortality tables, and expense and investment experience, including a provision for adverse deviation. The assumptions used to determine policy benefit reserves are generally locked-in for the life of the contract unless an unlocking event occurs. Loss recognition testing is performed to determine if existing policy benefit reserves, together with the present value of future gross premiums and expected investment income earned thereon, are adequate to cover the present value of future benefits, settlement and maintenance costs. If the existing policy benefit reserves are not sufficient, the locked-in assumptions are revised to current best estimate assumptions and a charge to earnings for life and annuity benefits is recognized at that time.

Because of the assumptions and estimates used in establishing the Company's reserves for life and annuity benefit obligations and the long-term nature of these reinsurance contracts, the ultimate liability may be greater or less than the estimates. The average discount rate for the life and annuity benefit reserves was 2.3% as of December 31, 2016.

As of December 31, 2016, the largest life and annuity benefits reserve for a single contract was 32.9% of the total.

No annuities included in life and annuity benefits in the consolidated balance sheet are subject to discretionary withdrawal.

On April 24, 2015, the Company completed a novation that transferred its obligations under a reinsurance contract for life and annuity benefit policies to a third party in exchange for cash payments totaling $29.0 million, net of commissions. At the time of the transaction, reserves for life and annuity benefits on the novated reinsurance contract totaled $32.6 million, resulting in a gain of $3.6 million that was recorded as an offset to other expenses.

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Senior Long-Term Debt And Other Debt

12 Months Ended

Dec. 31, 2016

Debt Disclosure [Abstract]

Senior Long-Term Debt And Other Debt

Senior Long-Term Debt and Other Debt

The following table summarizes the Company's senior long-term debt and other debt.

	December 31,
(dollars in thousands)	2016		2015
7.20% unsecured senior notes, due April 14, 2017, interest payable semi-annually, net of unamortized premium of $417 in 2016 and $1,808 in 2015	$	91,046	$	92,436
7.125% unsecured senior notes, due September 30, 2019, interest payable semi-annually, net of unamortized discount of $522 in 2016 and $1,060 in 2015	234,183		346,725
6.25% unsecured senior notes, due September 30, 2020, interest payable semi-annually, net of unamortized premium of $35,717 in 2016 and $44,519 in 2015	385,714		394,464
5.35% unsecured senior notes, due June 1, 2021, interest payable semi-annually, net of unamortized discount of $912 in 2016 and $1,119 in 2015	248,957		248,694
4.90% unsecured senior notes, due July 1, 2022, interest payable semi-annually, net of unamortized discount of $1,536 in 2016 and $1,815 in 2015	348,215		347,891
3.625% unsecured senior notes, due March 30, 2023, interest payable semi-annually, net of unamortized discount of $1,257 in 2016 and $1,458 in 2015	248,508		248,277
7.35% unsecured senior notes, due August 15, 2034, interest payable semi-annually, net of unamortized discount of $1,212 in 2016 and $1,972 in 2015	128,570		197,923
5.0% unsecured senior notes, due March 30, 2043, interest payable semi-annually, net of unamortized discount of $5,879 in 2016 and $6,103 in 2015	243,796		243,559
5.0% unsecured senior notes, due April 5, 2046, interest payable semi-annually, net of unamortized discount of $7,154 in 2016	491,943		—
Other debt, at various interest rates ranging from 1.7% to 6.5%	153,597		119,302
Senior long-term debt and other debt	$	2,574,529	$	2,239,271

The Company's 6.25% unsecured senior notes and the 7.20% unsecured senior notes were issued by Alterra Finance LLC and Alterra USA Holdings Limited, respectively, which are wholly owned indirect subsidiaries of the Company, and are guaranteed by Markel Corporation. All of the Company's other unsecured senior notes were issued by Markel Corporation.

In the second quarter of 2016, the Company issued $500 million of 5.0% unsecured senior notes due April 5, 2046. Net proceeds to the Company were $493.1 million. The Company used a portion of these proceeds to purchase $70.2 million of principal on its 7.35% unsecured senior notes due 2034 and $108.8 million of principal on its 7.125% unsecured senior notes due 2019 through a tender offer at a total purchase price of $95.0 million and $126.4 million, respectively. The Company also expects to use the proceeds from this issuance to retire its 7.20% unsecured senior notes, when they come due April 14, 2017, and the remainder for general corporate purposes. In connection with the purchase, the Company recognized a loss on early extinguishment of debt of $44.1 million during the year ended December 31, 2016.

The Company's 7.35% unsecured senior notes due August 15, 2034 are not redeemable. The Company's other unsecured senior notes are redeemable by the Company at any time, subject to payment of a make-whole premium to the noteholders. None of the Company's senior long-term debt is subject to any sinking fund requirements.

The Company's other debt is primarily associated with its Markel Ventures operations and is non-recourse to the holding company. The debt of the Company's Markel Ventures subsidiaries generally is secured by the assets of those subsidiaries. ParkLand, a subsidiary of the Company, has formed subsidiaries for the purpose of acquiring and financing real estate (the real estate subsidiaries). The assets of certain real estate subsidiaries, which are not material to the Company, are consolidated in accordance with U.S. GAAP but are not available to satisfy the debt and other obligations of the Company or any affiliates other than those real estate subsidiaries. Other debt also includes a $62.5 million note payable delivered as part of the consideration provided for the investment held by the Markel Diversified Fund, as discussed in note 17.

The estimated fair value of the Company's senior long-term debt and other debt was $2.7 billion and $2.4 billion at December 31, 2016 and 2015, respectively.

The following table summarizes the future principal payments due at maturity on senior long-term debt and other debt as of December 31, 2016.

Years Ending December 31,	(dollars in thousands)
2017	$	183,916
2018	6,365
2019	239,633
2020	359,332
2021	284,758
2022 and thereafter	1,485,404
Total principal payments	$	2,559,408
Net unamortized premium	17,662
Net unamortized debt issuance costs	(2,541		)
Senior long-term debt and other debt	$	2,574,529

The Company maintains a revolving credit facility which provides $300 million of capacity for future acquisitions, investments, repurchases of capital stock of the Company and for general corporate purposes. At the Company's discretion, $200 million of the total capacity may be used for secured letters of credit. The Company may increase the capacity of the facility to $500 million subject to certain terms and conditions. The Company pays interest on balances outstanding under the facility and a utilization fee for letters of credit issued under the facility. The Company also pays a commitment fee (0.225% at December 31, 2016) on the unused portion of the facility based on the Company's debt to equity leverage ratio as calculated under the credit agreement. Markel Corporation, along with Alterra Finance LLC and Alterra USA Holdings Limited, guaranteed the Company's obligations under the facility. As a result, the Company's revolving credit facility ranks equally with the 6.25% unsecured senior notes and the 7.20% unsecured senior notes. At December 31, 2016 and 2015, the Company had no borrowings outstanding under this revolving credit facility. This facility expires in August 2019.

At December 31, 2016, the Company was in compliance with all covenants contained in its revolving credit facility. To the extent that the Company is not in compliance with its covenants, the Company's access to the revolving credit facility could be restricted.

The Company paid $135.4 million, $127.0 million and $125.8 million in interest on its senior long-term debt and other debt during the years ended December 31, 2016, 2015 and 2014, respectively.

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Shareholders' Equity

12 Months Ended

Dec. 31, 2016

Stockholders' Equity Note [Abstract]

Shareholders' Equity

Shareholders' Equity

a)The Company had 50,000,000 shares of no par value common stock authorized of which 13,954,931 shares and 13,959,018 shares were issued and outstanding at December 31, 2016 and 2015, respectively. The Company also has 10,000,000 shares of no par value preferred stock authorized, none of which was issued or outstanding at December 31, 2016 or 2015.

The Company's Board of Directors has approved the repurchase of up to $300 million of common stock under a share repurchase program (the Program). Under the Program, the Company may repurchase outstanding shares of common stock from time to time, primarily through open-market transactions. The Program has no expiration date but may be terminated by the Board of Directors at any time. As of December 31, 2016, the Company had repurchased 96,345 shares of common stock at a cost of $70.7 million under the Program.

b)Net income per share was determined by dividing adjusted net income to shareholders by the applicable weighted average shares outstanding. Basic shares outstanding include restricted stock units that are no longer subject to any contingencies for issuance, but for which the corresponding shares have not been issued. Diluted net income per share is computed by dividing adjusted net income to shareholders by the weighted average number of common shares and dilutive potential common shares outstanding during the year. Average closing common stock market prices are used to calculate the dilutive effect attributable to restricted stock.

	Years Ended December 31,
(in thousands, except per share amounts)	2016			2015		2014
Net income to shareholders	$	455,689		$	582,772	$	321,182
Adjustment of redeemable noncontrolling interests	(15,472		)	4,144		(8,186		)
Adjusted net income to shareholders	$	440,217		$	586,916	$	312,996
Basic common shares outstanding	14,013			13,978		13,984
Dilutive potential common shares from conversion of options	4			9		11
Dilutive potential common shares from conversion of restricted stock	61			74		62
Diluted shares outstanding	14,078			14,061		14,057
Basic net income per share	$	31.41		$	41.99	$	22.38
Diluted net income per share	$	31.27		$	41.74	$	22.27

c)The Company's Employee Stock Purchase and Bonus Plan provides a method for employees and directors to purchase shares of the Company's common stock on the open market. The plan encourages share ownership by providing for the award of bonus shares to participants equal to 10% of the net increase in the number of shares owned under the plan in a given year, excluding shares acquired through the plan's loan program component. Under the loan program, the Company offers subsidized unsecured loans so participants may purchase shares and awards bonus shares equal to 5% of the shares purchased with a loan. In May 2016, the Company adopted the Markel Corporation 2016 Employee Stock Purchase and Bonus Plan which replaced the Company's prior Employee Stock Purchase and Bonus Plan. No shares have been issued under the prior Employee Stock Purchase and Bonus Plan since the effective date of the 2016 Employee Stock Purchase and Bonus Plan. The Company authorized 125,000 shares for purchase under the 2016 Employee Stock Purchase and Bonus Plan, of which 118,692 shares were available for purchase as of December 31, 2016. As of December 31, 2015, 9,458 shares were available for purchase under the prior Employee Stock Purchase and Bonus Plan. At December 31, 2016 and 2015, loans outstanding under the plans, which are included in receivables on the consolidated balance sheets, totaled $20.2 million and $16.9 million, respectively.

d)In May 2016, the Company adopted the 2016 Equity Incentive Compensation Plan (2016 Compensation Plan), which replaced the 2012 Equity Incentive Compensation Plan (2012 Compensation Plan). In April 2012, the Company adopted the 2012 Compensation Plan, which replaced the Markel Corporation Omnibus Incentive Plan (Omnibus Incentive Plan). The 2016 Compensation Plan provides for grants and awards of restricted stock, restricted stock units, performance grants, and other stock based awards to employees and non-employee directors and is administered by the Compensation Committee of the Company's Board of Directors (Compensation Committee). No share-based awards have been issued under the 2012 Compensation Plan after the effective date of the 2016 Compensation Plan. At December 31, 2016, there were 248,025 shares available for future awards under the 2016 Compensation Plan.

Restricted stock units are awarded to certain associates and executive officers based upon meeting performance conditions determined by the Compensation Committee. These awards generally vest at the end of the third year following the year for which the Compensation Committee determines performance conditions have been met. At the end of the vesting period, recipients are entitled to receive one share of the Company's common stock for each vested restricted stock unit. During 2016, the Company awarded 12,664 restricted stock units to associates and executive officers based on performance conditions being met.

Restricted stock units also are awarded to associates to assist the Company in securing or retaining the services of key employees. During 2016, the Company awarded 1,900 restricted stock units to associates as a hiring or retention incentive. The restricted stock units had a grant-date fair value of $1.7 million. These awards generally vest over a three-year period and entitle the recipient to receive one share of the Company's common stock for each vested restricted stock unit.

During 2016, the Company awarded 1,050 shares of restricted stock to its non-employee directors. The shares awarded to non-employee directors will vest in 2017.

The following table summarizes nonvested share-based awards.

	Number of Awards		Weighted Average Grant-Date Fair Value
Nonvested awards at January 1, 2016	103,883		$	556.66
Granted	15,614		878.03
Vested	(53,798	)	554.62
Forfeited	(81	)	632.82
Nonvested awards at December 31, 2016	65,618		$	634.71

The fair value of the Company's share-based awards issued under the Omnibus Incentive Plan was determined based on the average price of the Company's common shares on the grant date. The fair value of the Company's share-based awards granted under the 2012 Compensation Plan and 2016 Compensation Plan is determined based on the closing price of the Company's common shares on the grant date. The weighted average grant-date fair value of the Company's share-based awards granted in 2016, 2015 and 2014 was $878.03, $740.80 and $583.74, respectively. As of December 31, 2016, unrecognized compensation cost related to nonvested share-based awards was $10.7 million, which is expected to be recognized over a weighted average period of 1.6 years. The fair value of the Company's share-based awards that vested during 2016, 2015 and 2014 was $29.8 million, $15.8 million and $4.2 million, respectively.

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Other Comprehensive Income (Loss)

12 Months Ended

Dec. 31, 2016

Other Comprehensive Income (Loss), Tax [Abstract]

Other Comprehensive Income (Loss)

Other Comprehensive Income (Loss)

Other comprehensive income (loss) includes net holding gains (losses) arising during the period, changes in unrealized other-than-temporary impairment losses on fixed maturities arising during the period and reclassification adjustments for net gains included in net income. Other comprehensive income (loss) also includes changes in foreign currency translation adjustments and changes in net actuarial pension loss.

The following table presents the change in accumulated other comprehensive income by component, net of taxes and noncontrolling interests.

(dollars in thousands)	Unrealized Holding Gains on Available-for- Sale Securities			Foreign Currency			Net Actuarial Pension Loss			Total
December 31, 2013	$	1,131,507		$	(11,246	)	$	(30,456	)	$	1,089,805
Other comprehensive income (loss) before reclassifications	687,908			(32,245		)	(16,516		)	639,147
Amounts reclassified from accumulated other comprehensive income	(26,161		)	—			1,766			(24,395		)
Total other comprehensive income (loss)	661,747			(32,245		)	(14,750		)	614,752
December 31, 2014	$	1,793,254		$	(43,491	)	$	(45,206	)	$	1,704,557
Other comprehensive loss before reclassifications	(240,010		)	(29,205		)	(2,482		)	(271,697		)
Amounts reclassified from accumulated other comprehensive income	(80,482		)	—			2,130			(78,352		)
Total other comprehensive loss	(320,492		)	(29,205		)	(352		)	(350,049		)
December 31, 2015	$	1,472,762		$	(72,696	)	$	(45,558	)	$	1,354,508
Other comprehensive income (loss) before reclassifications	275,696			(11,710		)	(20,700		)	243,286
Amounts reclassified from accumulated other comprehensive income	(33,528		)	—			1,600			(31,928		)
Total other comprehensive income (loss)	242,168			(11,710		)	(19,100		)	211,358
December 31, 2016	$	1,714,930		$	(84,406	)	$	(64,658	)	$	1,565,866

The following table summarizes the tax expense (benefit) associated with each component of other comprehensive income (loss).

	Years Ended December 31,
(dollars in thousands)	2016			2015			2014
Change in net unrealized gains on investments:
Net holding gains (losses) arising during the period	$	112,399		$	(107,860	)	$	328,564
Change in unrealized other-than-temporary impairment losses on fixed maturities arising during the period	6			35			614
Reclassification adjustments for net gains included in net income	(12,462		)	(29,267		)	(9,890		)
Change in net unrealized gains on investments	99,943			(137,092		)	319,288
Change in foreign currency translation adjustments	1,037			408			1,918
Change in net actuarial pension loss	(4,192		)	(88		)	(3,687		)
Total	$	96,788		$	(136,772	)	$	317,519

The following table presents the details of amounts reclassified from accumulated other comprehensive income into income, by component.

	Years Ended December 31,
(dollars in thousands)	2016			2015			2014
Unrealized holding gains on available-for-sale securities:
Other-than-temporary impairment losses	$	(18,355	)	$	(44,481	)	$	(4,784	)
Net realized investment gains, excluding other-than-temporary impairment losses	64,345			154,230			40,835
Total before taxes	45,990			109,749			36,051
Income taxes	(12,462		)	(29,267		)	(9,890		)
Reclassification of unrealized holding gains, net of taxes	$	33,528		$	80,482		$	26,161
Net actuarial pension loss:
Underwriting, acquisition and insurance expenses	$	(1,951	)	$	(2,662	)	$	(2,084	)
Income taxes	351			532			318
Reclassification of net actuarial pension loss, net of taxes	$	(1,600	)	$	(2,130	)	$	(1,766	)

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Fair Value Measurements

12 Months Ended

Dec. 31, 2016

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements

FASB ASC 820-10, Fair Value Measurements and Disclosures, establishes a three-level hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The fair value hierarchy gives the highest priority to quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). If the inputs used to measure the assets or liabilities fall within different levels of the hierarchy, the classification is based on the lowest level input that is significant to the fair value measurement of the asset or liability.

Classification of assets and liabilities within the hierarchy considers the markets in which the assets and liabilities are traded and the reliability and transparency of the assumptions used to determine fair value. The hierarchy requires the use of observable market data when available. The levels of the hierarchy are defined as follows:

Level 1 - Inputs to the valuation methodology are quoted prices (unadjusted) for identical assets or liabilities traded in active markets.

Level 2 - Inputs to the valuation methodology include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability and market-corroborated inputs.

Level 3 - Inputs to the valuation methodology are unobservable for the asset or liability and are significant to the fair value measurement.

In accordance with FASB ASC 820, the Company determines fair value based on the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. In determining fair value, the Company uses various methods, including the market, income and cost approaches. The Company uses valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs. The following section describes the valuation methodologies used by the Company to measure assets and liabilities at fair value, including an indication of the level within the fair value hierarchy in which each asset or liability is generally classified.

Investments available-for-sale. Investments available-for-sale are recorded at fair value on a recurring basis and include fixed maturity securities, equity securities and short-term investments. Short-term investments include certificates of deposit, commercial paper, discount notes and treasury bills with original maturities of one year or less. Fair value for investments available-for-sale is determined by the Company after considering various sources of information, including information provided by a third party pricing service. The pricing service provides prices for substantially all of the Company's fixed maturity securities and equity securities. In determining fair value, the Company generally does not adjust the prices obtained from the pricing service. The Company obtains an understanding of the pricing service's valuation methodologies and related inputs, which include, but are not limited to, reported trades, benchmark yields, issuer spreads, bids, offers, duration, credit ratings, estimated cash flows and prepayment speeds. The Company validates prices provided by the pricing service by reviewing prices from other pricing sources and analyzing pricing data in certain instances.

The Company has evaluated the various types of securities in its investment portfolio to determine an appropriate fair value hierarchy level based upon trading activity and the observability of market inputs. Level 1 investments include those traded on an active exchange, such as the New York Stock Exchange. Level 2 investments include U.S. Treasury securities, U.S. government-sponsored enterprises, municipal bonds, foreign government bonds, commercial mortgage-backed securities, residential mortgage-backed securities, asset-backed securities and corporate debt securities. Level 3 investments include the Company's investments in insurance-linked securities funds (the ILS Funds), as further described in note 17, which are not traded on an active exchange and are valued using unobservable inputs.

Fair value for investments available-for-sale is measured based upon quoted prices in active markets, if available. Due to variations in trading volumes and the lack of quoted market prices, fixed maturities are classified as Level 2 investments. The fair value of fixed maturities is normally derived through recent reported trades for identical or similar securities, making adjustments through the reporting date based upon available market observable data described above. If there are no recent reported trades, the fair value of fixed maturities may be derived through the use of matrix pricing or model processes, where future cash flow expectations are developed based upon collateral performance and discounted at an estimated market rate. Significant inputs used to determine the fair value of obligations of states, municipalities and political subdivisions, corporate bonds and obligations of foreign governments include reported trades, benchmark yields, issuer spreads, bids, offers, credit information and estimated cash flows. Significant inputs used to determine the fair value of commercial mortgage-backed securities, residential mortgage-backed securities and asset-backed securities include the type of underlying assets, benchmark yields, prepayment speeds, collateral information, tranche type and volatility, estimated cash flows, credit information, default rates, recovery rates, issuer spreads and the year of issue.

Due to the significance of unobservable inputs required in measuring the fair value of the Company's investments in the ILS Funds, these investments are classified as Level 3 within the fair value hierarchy. Changes in fair value of the ILS Funds are included in net realized gains (losses) in net income. The fair value of the securities are derived using their reported net asset value (NAV) as the primary input, as well as other observable and unobservable inputs as deemed necessary by management. Management has obtained an understanding of the inputs, assumptions, process, and controls used to determine NAV, which is calculated by an independent third party. Unobservable inputs to the NAV calculations include assumptions around premium earnings patterns and loss reserve estimates for the underlying securitized reinsurance contracts in which the ILS Funds invest. Significant unobservable inputs used in the valuation of these investments include an adjustment to include the fair value of the equity that was issued by one of the ILS Funds in exchange for notes receivable, rather than cash, which is excluded from NAV. The Company's investments in the ILS Funds are redeemable annually as of January 1^st of each calendar year.

The Company's valuation policies and procedures for Level 3 investments are determined by management. Fair value measurements are analyzed quarterly to ensure the change in fair value from prior periods is reasonable relative to management's understanding of the underlying investments, recent market trends and external market data, which includes the price of a comparable security and an insurance-linked security index.

Senior long-term debt and other debt. Senior long-term debt and other debt is carried at amortized cost with the estimated fair value disclosed on the consolidated balance sheets. Senior long-term debt and other debt is classified as Level 2 within the fair value hierarchy due to variations in trading volumes and the lack of quoted market prices. Fair value for senior long-term debt and other debt is generally derived through recent reported trades for identical securities, making adjustments through the reporting date, if necessary, based upon available market observable data including U.S. Treasury securities and implied credit spreads. Significant inputs used to determine the fair value of senior long-term debt and other debt include reported trades, benchmark yields, issuer spreads, bids and offers.

The following tables present the balances of assets measured at fair value on a recurring basis by level within the fair value hierarchy.

	December 31, 2016
(dollars in thousands)	Level 1		Level 2		Level 3		Total
Assets:
Investments available-for-sale:
Fixed maturity securities:
U.S. Treasury	$	—	$	258,584	$	—	$	258,584
U.S. government-sponsored enterprises	—		423,212		—		423,212
Obligations of states, municipalities and political subdivisions	—		4,428,205		—		4,428,205
Foreign governments	—		1,463,462		—		1,463,462
Commercial mortgage-backed	—		1,040,356		—		1,040,356
Residential mortgage-backed	—		790,946		—		790,946
Asset-backed	—		27,338		—		27,338
Corporate	—		1,459,407		—		1,459,407
Total fixed maturity securities	—		9,891,510		—		9,891,510
Equity securities:
Insurance, banks and other financial institutions	1,506,607		—		191,203		1,697,810
Industrial, consumer and all other	3,048,031		—		—		3,048,031
Total equity securities	4,554,638		—		191,203		4,745,841
Short-term investments	2,255,898		80,253		—		2,336,151
Total investments available-for-sale	$	6,810,536	$	9,971,763	$	191,203	$	16,973,502

	December 31, 2015
(dollars in thousands)	Level 1		Level 2		Level 3		Total
Assets:
Investments available-for-sale:
Fixed maturity securities:
U.S. Treasury	$	—	$	309,417	$	—	$	309,417
U.S. government-sponsored enterprises	—		391,290		—		391,290
Obligations of states, municipalities and political subdivisions	—		4,013,213		—		4,013,213
Foreign governments	—		1,416,457		—		1,416,457
Commercial mortgage-backed	—		659,538		—		659,538
Residential mortgage-backed	—		854,247		—		854,247
Asset-backed	—		36,071		—		36,071
Corporate	—		1,714,235		—		1,714,235
Total fixed maturity securities	—		9,394,468		—		9,394,468
Equity securities:
Insurance, banks and other financial institutions	1,334,722		—		—		1,334,722
Industrial, consumer and all other	2,739,753		—		—		2,739,753
Total equity securities	4,074,475		—		—		4,074,475
Short-term investments	1,529,924		112,337		—		1,642,261
Total investments available-for-sale	$	5,604,399	$	9,506,805	$	—	$	15,111,204

The following table summarizes changes in Level 3 investments measured at fair value on a recurring basis.

(dollars in thousands)	2016			2015
Equity securities, beginning of period	$	—		$	—
Purchases	195,250			—
Sales	(25,000		)	—
Total gains included in:
Net income	20,953			—
Other comprehensive income (loss)	—			—
Transfers into Level 3	—			—
Transfers out of Level 3	—			—
Equity securities, end of period	$	191,203		$	—
Net unrealized gains included in net income relating to assets held at December 31, 2016 and 2015 (1)	$	20,953		$	—

⁽¹⁾Included in net realized investment gains in the consolidated statements of income and comprehensive income.

There were no transfers into or out of Level 1 and Level 2 during 2016 or 2015.

The Company did not have any assets or liabilities measured at fair value on a non-recurring basis during the years ended December 31, 2016 and 2015.

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Reinsurance

12 Months Ended

Dec. 31, 2016

Reinsurance Disclosures [Abstract]

Reinsurance

Reinsurance

The Company uses reinsurance and retrocessional reinsurance to manage its net retention on individual risks and overall exposure to losses while providing it with the ability to offer policies with sufficient limits to meet policyholder needs. In reinsurance and retrocession transactions, an insurance or reinsurance company transfers, or cedes, all or part of its exposure in return for a portion of the premium. The ceding of insurance does not legally discharge the Company from its primary liability for the full amount of the policies, and the Company will be required to pay the loss and bear collection risk if the reinsurer fails to meet its obligations under the reinsurance or retrocessional agreement.

A credit risk exists with ceded reinsurance to the extent that any reinsurer is unable to meet the obligations assumed under the reinsurance or retrocessional contracts. Allowances are established for amounts deemed uncollectible. The Company evaluates the financial condition of its reinsurers and monitors concentration of credit risk arising from its exposure to individual reinsurers. At December 31, 2016 and 2015, balances recoverable from the Company's ten largest reinsurers, by group, represented approximately 67% and 68%, respectively, of the reinsurance recoverable on paid and unpaid losses, before considering reinsurance allowances. At December 31, 2016, the Company's largest reinsurance balance was due from the Fairfax Financial Group and represented 15% of the reinsurance recoverable on paid and unpaid losses, before considering reinsurance allowances.

To further reduce credit exposure to reinsurance recoverable balances, the Company has received collateral, including letters of credit and trust accounts, from certain reinsurers. Collateral related to these reinsurance agreements is available, without restriction, when the Company pays losses covered by the reinsurance agreements.

The following table summarizes the Company's reinsurance allowance for doubtful accounts.

	Years Ended December 31,
(dollars in thousands)	2016			2015			2014
Reinsurance allowance, beginning of year	$	59,350		$	59,813		$	76,210
Additions	980			5,897			10,316
Deductions	(23,560		)	(6,360		)	(26,713		)
Reinsurance allowance, end of year	$	36,770		$	59,350		$	59,813

Management believes the Company's reinsurance allowance for doubtful accounts is adequate at December 31, 2016; however, the deterioration in the credit quality of existing reinsurers or disputes over reinsurance and retrocessional contracts could result in additional charges.

The following table summarizes the effect of reinsurance and retrocessional reinsurance on premiums written and earned.

	Years Ended December 31,
	2016						2015						2014
(dollars in thousands)	Written			Earned			Written			Earned			Written			Earned
Direct	$	3,560,635		$	3,506,687		$	3,474,510		$	3,480,297		$	3,478,273		$	3,443,912
Assumed	1,236,010			1,176,205			1,158,402			1,194,772			1,327,240			1,298,371
Ceded	(795,625		)	(817,022		)	(813,619		)	(851,537		)	(888,498		)	(901,371		)
Net premiums	$	4,001,020		$	3,865,870		$	3,819,293		$	3,823,532		$	3,917,015		$	3,840,912

Incurred losses and loss adjustment expenses were net of reinsurance recoverables (ceded incurred losses and loss adjustment expenses) of $362.0 million, $330.7 million and $423.1 million for the years ended December 31, 2016, 2015 and 2014, respectively.

The percentage of ceded earned premiums to gross earned premiums was 17%, 18% and 19% for the years ended December 31, 2016, 2015 and 2014, respectively. The percentage of assumed earned premiums to net earned premiums was 30%, 31% and 34% for the years ended December 31, 2016, 2015 and 2014, respectively.

See note 9 of the notes to consolidated financial statements for information regarding two retroactive reinsurance transactions completed during 2015 to cede portfolios of policies primarily comprised of liabilities arising from A&E exposures.

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Commitments And Contingencies

12 Months Ended

Dec. 31, 2016

Commitments and Contingencies Disclosure [Abstract]

Commitments And Contingencies

Commitments and Contingencies

a)The Company leases substantially all of its facilities and certain furniture and equipment under noncancelable operating leases with remaining terms up to 18 years.

The following table summarizes the Company's minimum annual rental commitments, excluding taxes, insurance and other operating costs payable directly by the Company, for noncancelable operating leases at December 31, 2016.

Years Ending December 31,	(dollars in thousands)
2017	$	34,449
2018	31,883
2019	29,270
2020	21,536
2021	21,140
2022 and thereafter	95,979
Total	$	234,257

Rental expense was $40.2 million, $44.3 million and $42.7 million for the years ended December 31, 2016, 2015 and 2014, respectively.

b)Contingencies arise in the normal course of the Company's operations and are not expected to have a material impact on the Company's financial condition or results of operations.

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Variable Interest Entities

12 Months Ended

Dec. 31, 2016

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Variable Interest Entities

Variable Interest Entities

In December 2015, the Company formed MCIM, a wholly owned consolidated subsidiary. MCIM is an insurance-linked securities investment fund manager and insurance manager headquartered in Bermuda. Results attributable to MCIM are included with the Company's non-insurance operations, which are not included in a reportable segment.

In December 2015, the Company also formed a mutual fund company and reinsurance company, both of which were organized under Bermuda law and are managed by MCIM. The mutual fund company issues multiple classes of nonvoting, redeemable preference shares to investors through its funds (the Funds) and the Funds are primarily invested in nonvoting shares of the reinsurance company. The underwriting results of the reinsurance company are attributed to the Funds through the issuance of nonvoting preference shares.

The Funds and the reinsurance company are considered VIEs, as their preference shareholders have no voting rights. MCIM has the power to direct the activities that most significantly impact the economic performance of these entities, but does not have a variable interest in any of the entities. Except as described below, the Company is not the primary beneficiary of the Funds or the reinsurance company, as the Company's involvement is generally limited to that of an investment or insurance manager, receiving fees that are at market and commensurate with the level of effort required. Investment management fees earned by the Company from unconsolidated Funds for the year ended December 31, 2016 were $56.5 million. The Company is the sole investor in one of the Funds, the Markel Diversified Fund, and consolidates that fund as its primary beneficiary. The Company also holds an investment in another one of the Funds ($26.1 million as of December 31, 2016) but does not have the obligation to absorb losses or right to receive benefits from the VIE that could potentially be significant to the VIE, and therefore does not consolidate that Fund.

As of December 31, 2016, total assets of the Markel Diversified Fund were $166.8 million and total liabilities were $64.6 million. The assets of the Markel Diversified Fund are available for use only by the Markel Diversified Fund, and are not available for use by the Company. Total assets of the Markel Diversified Fund include an investment in one of the unconsolidated Funds totaling $165.1 million as of December 31, 2016, which represents 6% of the outstanding preference shares of that fund. This investment is included in equity securities (available-for-sale) on the Company's consolidated balance sheet. Total liabilities of the Markel Diversified Fund include a $62.5 million note payable delivered as part of the consideration provided for its investment. This note payable is included in senior long-term debt and other debt on the Company's consolidated balance sheet. Other than the note payable, any liabilities held by the Markel Diversified Fund have no recourse to the Company's general credit.

The Company's exposure to risk from the unconsolidated Funds and reinsurance company is generally limited to its investment and any earned but uncollected fees. The Company has not issued any investment performance guarantees to these VIEs or their investors. As of December 31, 2016, total investment and insurance assets under management of MCIM for unconsolidated VIEs were $3.4 billion.

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Related Party Transactions

12 Months Ended

Dec. 31, 2016

Related Party Transactions [Abstract]

Related Party Transactions

Related Party Transactions

The Company engages in certain related party transactions in the normal course of business. These transactions are at arm's length and are not material to the Company's consolidated financial statements. See note 17 for a discussion of the Company's related party transactions with unconsolidated VIEs.

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Statutory Financial Information

12 Months Ended

Dec. 31, 2016

Statutory Financial Information [Abstract]

Statutory Financial Information

Statutory Financial Information

a) Statutory capital and surplus and statutory net income (loss) for the Company's insurance subsidiaries as of December 31, 2016 and 2015 and for the years ended December 31, 2016, 2015 and 2014, respectively, is summarized below.

Statutory Capital and Surplus
(dollars in thousands)	2016		2015
United States	$	2,761,454	$	2,569,928
United Kingdom	$	682,477	$	603,238
Bermuda	$	2,189,649	$	1,964,844
Other	$	24,726	$	17,305

As of December 31, 2016, the amount of statutory capital and surplus necessary to satisfy regulatory requirements is not significant in relation to actual statutory capital and surplus.

Statutory Net Income (Loss)
	Years Ended December 31,
(dollars in thousands)	2016			2015			2014
United States	$	249,176		$	291,783		$	212,909
United Kingdom	$	77,909		$	74,330		$	73,697
Bermuda	$	132,442		$	185,289		$	110,401
Other	$	(891	)	$	(3,181	)	$	1,367

The Solvency II Directive that governs the calculation of statutory capital and surplus for the Company's United Kingdom insurance subsidiary does not provide requirements for the calculation of net income. Amounts presented in the table above have been calculated in accordance with United Kingdom GAAP.

United States

The laws of the domicile states of the Company's U.S. insurance subsidiaries govern the amount of dividends that may be paid to the Company. Generally, statutes in the domicile states of the Company's U.S. insurance subsidiaries require prior approval for payment of extraordinary, as opposed to ordinary, dividends. At December 31, 2016, the Company's U.S. insurance subsidiaries could pay up to $330.4 million during the following 12 months under the ordinary dividend regulations.

In converting from U.S. statutory accounting principles to U.S. GAAP, typical adjustments include deferral of policy acquisition costs, differences in the calculation of deferred income taxes and the inclusion of net unrealized gains or losses relating to fixed maturities in shareholders' equity. The Company does not use any permitted statutory accounting practices that are different from prescribed statutory accounting practices which impact statutory capital and surplus.

United Kingdom

The Company's United Kingdom insurance subsidiary, Markel International Insurance Company Limited (MIICL), and its Lloyd's managing agent, Markel Syndicate Management Limited (MSM), are authorized by the Prudential Regulation Authority (PRA) and regulated by both the PRA and the Financial Conduct Authority (FCA). The PRA oversees compliance with established periodic auditing and reporting requirements, minimum solvency margins and individual capital assessment requirements under the Solvency II Directive and imposes dividend restrictions, while both the PRA and the FCA oversee compliance with risk assessment reviews and various other requirements. MIICL is required to give advance notice to the PRA for any dividends from MIICL and any transaction or proposed transaction with a connected or related person. MSM is required to satisfy the solvency requirements of Lloyd's. In addition, the Company's United Kingdom subsidiaries must comply with the United Kingdom Companies Act of 2006, which provides that dividends may only be paid out of profits available for that purpose. As of December 31, 2016, earnings of the Company's United Kingdom subsidiaries, to the extent not previously taxed in the United States, are considered reinvested indefinitely for U.S. income tax purposes and will not be made available for distributions to the holding company.

Bermuda

The Company's Bermuda insurance subsidiary, Markel Bermuda Limited (Markel Bermuda), is subject to enhanced capital requirements in addition to minimum solvency and liquidity requirements. The enhanced capital requirement is determined by reference to a risk-based capital model that determines a control threshold for statutory capital and surplus by taking into account the risk characteristics of different aspects of the insurer's business. At December 31, 2016, Markel Bermuda satisfied both the enhanced capital requirements and the minimum solvency and liquidity requirements.

Under the Bermuda Insurance Act, Markel Bermuda is prohibited from paying or declaring dividends during a fiscal year if it is in breach of its enhanced capital requirement, solvency margin or minimum liquidity ratio or if the declaration or payment of the dividend would cause a breach of those requirements. If an insurer fails to meet its solvency margin or minimum liquidity ratio on the last day of any financial year, it is prohibited from declaring or paying any dividends during the next financial year without the approval of the Bermuda Monetary Authority (BMA). Further, Markel Bermuda is prohibited from declaring or paying, in any financial year, dividends of more than 25% of its total statutory capital and surplus as set forth in its previous year's statutory balance sheet unless at least seven days before payment of those dividends it files with the BMA an affidavit stating that it will continue to meet its solvency margin and minimum liquidity ratio. Markel Bermuda must obtain the BMA's prior approval for a reduction by 15% or more of the total statutory capital as set forth in its previous year's financial statements. In addition, as a long-term insurer, Markel Bermuda may not declare or pay a dividend to any person other than a policyholder unless the value of the assets in its long-term business fund, as certified by Markel Bermuda's approved actuary, exceeds the liabilities of its long-term business. The amount of the dividend cannot exceed the aggregate of that excess and any other funds legally available for the payment of the dividend. As of December 31, 2016, Markel Bermuda could pay up to $547.4 million during the following 12 months without making any additional filings with the BMA.

Other Jurisdictions

The Company's other foreign subsidiaries are subject to capital and solvency requirements in their respective jurisdictions of domicile that govern their ability to declare and pay dividends. As of December 31, 2016, earnings of our foreign subsidiaries, to the extent not previously taxed in the United States, are considered reinvested indefinitely for U.S. income tax purposes and will not be made available for distributions to the holding company.

b)    Lloyd's sets the corporate members' required capital annually based on each syndicates' business plans, rating environment, reserving environment and input arising from Lloyd's discussions with, inter alia, regulatory and rating agencies. Such required capital is referred to as Funds at Lloyd's (FAL), and comprises cash and investments. The amount of cash and investments held as FAL as of December 31, 2016 was $784.9 million. The amount which the Company provides as FAL is not available for distribution to the holding company. The Company's corporate members may also be required to maintain funds under the control of Lloyd's in excess of their capital requirements and such funds also may not be available for distribution to the holding company.

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Segment Reporting Disclosures

12 Months Ended

Dec. 31, 2016

Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]

Segment Reporting Disclosures

Segment Reporting Disclosures

The Company monitors and reports its ongoing underwriting operations in the following three segments: U.S. Insurance, International Insurance and Reinsurance. In determining how to aggregate and monitor its underwriting results, the Company considers many factors, including the geographic location and regulatory environment of the insurance entity underwriting the risk, the nature of the insurance product sold, the type of account written and the type of customer served. The U.S. Insurance segment includes all direct business and facultative reinsurance placements written by the Company's insurance subsidiaries domiciled in the United States. The International Insurance segment includes all direct business and facultative reinsurance placements written by the Company's insurance subsidiaries domiciled outside of the United States, including the Company's syndicate at Lloyd's of London. The Reinsurance segment includes all treaty reinsurance written across the Company. Results for lines of business discontinued prior to, or in conjunction with, acquisitions, including results attributable to the run-off of life and annuity reinsurance business, are reported in the Other Insurance (Discontinued Lines) segment. All investing activities related to the Company's insurance operations are included in the Investing segment.

The Company's non-insurance operations include its Markel Ventures operations, which primarily consist of controlling interests in various industrial and service businesses. The Company's non-insurance operations also include the results of the Company's legal and professional consulting services, and, effective December 8, 2015, the results of the Company's investment management services attributable to MCIM. For purposes of segment reporting, the Company's non-insurance operations are not considered a reportable segment.

The following table summarizes the Company's gross written premiums by country. Gross written premiums are attributed to individual countries based upon location of risk or cedent.

	Years Ended December 31,
(dollars in thousands)	2016		% of Total		2015		% of Total		2014		% of Total
United States	$	3,691,840	77	%	$	3,519,487	76	%	$	3,523,239	73	%
United Kingdom	358,348		7		414,941		9		441,669		9
Canada	125,444		3		115,191		2		125,617		3
Other countries	621,013		13		583,293		13		714,988		15
Total	$	4,796,645	100	%	$	4,632,912	100	%	$	4,805,513	100	%

Most of the Company's gross written premiums are placed through insurance and reinsurance brokers. During the years ended December 31, 2016, 2015 and 2014, the top three independent brokers accounted for approximately 28%, 27% and 28% of consolidated gross premiums written. During the years ended December 31, 2016, 2015 and 2014, the top three independent brokers accounted for approximately 40%, 42% and 41%, respectively, of gross premiums written in the International Insurance segment and 75%, 68% and 68%, respectively, of gross premiums written in the Reinsurance segment.

Segment profit for the Investing segment is measured by net investment income and net realized investment gains or losses. Segment profit or loss for each of the Company's underwriting segments is measured by underwriting profit or loss. The property and casualty insurance industry commonly defines underwriting profit or loss as earned premiums net of losses and loss adjustment expenses and underwriting, acquisition and insurance expenses. Underwriting profit or loss does not replace operating income or net income computed in accordance with U.S. GAAP as a measure of profitability. Underwriting profit or loss provides a basis for management to evaluate the Company's underwriting performance. Segment profit or loss for the Company's underwriting segments also includes other revenues and other expenses, primarily related to the run-off of managing general agent operations that were discontinued in conjunction with acquisitions. Other revenues and other expenses in the Other Insurance (Discontinued Lines) segment are comprised of the results attributable to the run-off of life and annuity reinsurance business.

For management reporting purposes, the Company allocates assets to its underwriting, investing and non-insurance operations. Underwriting assets are all assets not specifically allocated to the Investing segment or to the Company's non-insurance operations. Underwriting and investing assets are not allocated to the U.S. Insurance, International Insurance, Reinsurance or Other Insurance (Discontinued Lines) segments since the Company does not manage its assets by underwriting segment. The Company does not allocate capital expenditures for long-lived assets to any of its underwriting segments for management reporting purposes.

a) The following tables summarize the Company's segment disclosures.

	Year Ended December 31, 2016
(dollars in thousands)	U.S. Insurance			International Insurance			Reinsurance			Other Insurance (Discontinued Lines)				Investing		Consolidated
Gross premium volume	$	2,635,266		$	1,119,815		$	1,041,055		$	509			$	—	$	4,796,645
Net written premiums	2,237,163			864,494			898,728			635				—		4,001,020
Earned premiums	2,175,332			853,512			836,264			762				—		3,865,870
Losses and loss adjustment expenses:
Current accident year	(1,403,589		)	(605,837		)	(546,476		)	—				—		(2,555,902		)
Prior accident years	204,881			164,713			125,514			10,050				—		505,158
Amortization of policy acquisition costs	(446,649		)	(146,117		)	(189,455		)	—				—		(782,221		)
Other operating expenses	(377,230		)	(219,066		)	(119,012		)	(1,061		)		—		(716,369		)
Underwriting profit	152,745			47,205			106,835			9,751				—		316,536
Net investment income	—			—			—			—				373,230		373,230
Net realized investment gains	—			—			—			—				65,147		65,147
Other revenues (insurance)	7,143			5,560			—			1,891				—		14,594
Other expenses (insurance)	(15,407		)	(5,712		)	—			(26,504		)		—		(47,623		)
Segment profit (loss)	$	144,481		$	47,053		$	106,835		$	(14,862	)		$	438,377	$	721,884
Other revenues (non-insurance)																1,293,185
Other expenses (non-insurance)																(1,142,620		)
Amortization of intangible assets																(68,533		)
Interest expense																(129,896		)
Loss on early extinguishment of debt																(44,100		)
Income before income taxes																$	629,920
U.S. GAAP combined ratio (1)	93		%	94		%	87		%	NM			(2)			92		%

⁽¹⁾  The U.S. GAAP combined ratio is a measure of underwriting performance and represents the relationship of incurred losses, loss adjustment expenses and underwriting, acquisition and insurance expenses to earned premiums.

⁽²⁾  NM — Ratio is not meaningful.

	Year Ended December 31, 2015
(dollars in thousands)	U.S. Insurance			International Insurance			Reinsurance			Other Insurance (Discontinued Lines)				Investing		Consolidated
Gross premium volume	$	2,504,096		$	1,164,866		$	965,374		$	(1,424	)		$	—	$	4,632,912
Net written premiums	2,106,490			888,214			824,324			265				—		3,819,293
Earned premiums	2,105,212			879,426			838,543			351				—		3,823,532
Losses and loss adjustment expenses:
Current accident year	(1,367,159		)	(638,144		)	(561,242		)	—				—		(2,566,545		)
Prior accident years	298,967			248,834			97,860			(17,861		)		—		627,800
Amortization of policy acquisition costs	(420,289		)	(142,657		)	(182,018		)	—				—		(744,964		)
Other operating expenses	(378,563		)	(221,758		)	(106,863		)	(2,932		)		—		(710,116		)
Underwriting profit (loss)	238,168			125,701			86,280			(20,442		)		—		429,707
Net investment income	—			—			—			—				353,213		353,213
Net realized investment gains	—			—			—			—				106,480		106,480
Other revenues (insurance)	3,331			7,790			593			617				—		12,331
Other expenses (insurance)	(3,902		)	(5,717		)	(1,419		)	(29,057		)		—		(40,095		)
Segment profit (loss)	$	237,597		$	127,774		$	85,454		$	(48,882	)		$	459,693	$	861,636
Other revenues (non-insurance)																1,074,427
Other expenses (non-insurance)																(1,006,710		)
Amortization of intangible assets																(68,947		)
Interest expense																(118,301		)
Income before income taxes																$	742,105
U.S. GAAP combined ratio (1)	89		%	86		%	90		%	NM			(2)			89		%

⁽¹⁾  The U.S. GAAP combined ratio is a measure of underwriting performance and represents the relationship of incurred losses, loss adjustment expenses and underwriting, acquisition and insurance expenses to earned premiums.

⁽²⁾  NM — Ratio is not meaningful.

	Year Ended December 31, 2014
(dollars in thousands)	U.S. Insurance			International Insurance			Reinsurance			Other Insurance (Discontinued Lines)				Investing		Consolidated
Gross premium volume	$	2,493,823		$	1,200,403		$	1,112,728		$	(1,441	)		$	—	$	4,805,513
Net written premiums	2,071,466			889,336			956,584			(371		)		—		3,917,015
Earned premiums	2,022,860			909,679			908,385			(12		)		—		3,840,912
Losses and loss adjustment expenses:
Current accident year	(1,340,129		)	(660,409		)	(637,474		)	—				—		(2,638,012		)
Prior accident years	216,557			166,615			79,951			(27,578		)		—		435,545
Amortization of policy acquisition costs	(403,233		)	(141,394		)	(110,289		)	—				—		(654,916		)
Other operating expenses	(396,737		)	(207,175		)	(201,673		)	(381		)		—		(805,966		)
Underwriting profit (loss)	99,318			67,316			38,900			(27,971		)		—		177,563
Net investment income	—			—			—			—				363,230		363,230
Net realized investment gains	—			—			—			—				46,000		46,000
Other revenues (insurance)	2,478			21,827			2,696			1,631				—		28,632
Other expenses (insurance)	(5,149		)	(18,706		)	(1,847		)	(37,132		)		—		(62,834		)
Segment profit (loss)	$	96,647		$	70,437		$	39,749		$	(63,472	)		$	409,230	$	552,591
Other revenues (non-insurance)																854,893
Other expenses (non-insurance)																(792,037		)
Amortization of intangible assets																(57,627		)
Interest expense																(117,442		)
Income before income taxes																$	440,378
U.S. GAAP combined ratio (1)	95		%	93		%	96		%	NM			(2)			95		%

⁽¹⁾  The U.S. GAAP combined ratio is a measure of underwriting performance and represents the relationship of incurred losses, loss adjustment expenses and underwriting, acquisition and insurance expenses to earned premiums.

⁽²⁾  NM — Ratio is not meaningful.

b)The following table summarizes deferred policy acquisition costs, unearned premiums and unpaid losses and loss adjustment expenses by segment.

(dollars in thousands)	Deferred Policy Acquisition Costs		Unearned Premiums		Unpaid Losses and Loss Adjustment Expenses
December 31, 2016
U.S. Insurance	$	176,348	$	1,166,914	$	3,849,541
International Insurance	51,948		445,183		3,062,725
Reinsurance	164,114		651,741		2,661,209
Other Insurance (Discontinued Lines)	—		—		542,187
Total	$	392,410	$	2,263,838	$	10,115,662
December 31, 2015
U.S. Insurance	$	162,289	$	1,105,456	$	3,720,429
International Insurance	48,913		467,158		3,140,000
Reinsurance	141,554		593,491		2,750,258
Other Insurance (Discontinued Lines)	—		—		641,266
Total	$	352,756	$	2,166,105	$	10,251,953

c)The following table summarizes segment earned premiums by major product grouping.

	Years Ended December 31,
(dollars in thousands)	2016		2015		2014
U.S. Insurance:
General liability	$	563,908	$	522,358	$	491,645
Professional liability	328,597		324,230		321,005
Property	270,026		264,232		266,019
Personal lines	364,843		325,811		299,442
Programs	263,783		277,829		244,216
Workers compensation	301,126		281,954		263,164
Other	83,049		108,798		137,369
Total U.S. Insurance	2,175,332		2,105,212		2,022,860
International Insurance:
General liability	111,291		124,198		146,178
Professional liability	272,010		268,637		285,300
Property	87,294		85,152		76,691
Marine and energy	242,070		262,307		287,263
Other	140,847		139,132		114,247
Total International Insurance	853,512		879,426		909,679
Reinsurance:
Property	288,771		265,373		270,461
Casualty	327,383		315,027		323,390
Auto	65,363		102,227		152,645
Other	154,747		155,916		161,889
Total Reinsurance	836,264		838,543		908,385
Other Insurance (Discontinued Lines)	762		351		(12		)
Total earned premiums	$	3,865,870	$	3,823,532	$	3,840,912

The Company does not manage products at this level of aggregation. The Company offers a diverse portfolio of products and manages these products in logical groupings within each operating segment.

d)The following table reconciles segment assets to the Company's consolidated balance sheets.

	December 31,
(dollars in thousands)	2016		2015		2014
Segment assets:
Investing	$	19,029,584	$	18,056,947	$	18,531,150
Underwriting	5,397,696		5,385,126		5,420,624
Total segment assets	24,427,280		23,442,073		23,951,774
Non-insurance operations	1,448,019		1,497,042		1,245,986
Total assets	$	25,875,299	$	24,939,115	$	25,197,760

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Other Revenues And Other Expenses

12 Months Ended

Dec. 31, 2016

Other Income and Expenses [Abstract]

Other Revenues And Other Expenses

Other Revenues and Other Expenses

The following table summarizes the components of other revenues and other expenses.

	Years Ended December 31,
	2016				2015				2014
(dollars in thousands)	Other Revenues		Other Expenses		Other Revenues		Other Expenses		Other Revenues		Other Expenses
Insurance:
Managing general agent operations	$	12,703	$	21,119	$	10,202	$	9,619	$	23,324	$	22,527
Life and annuity	1,891		26,504		617		29,057		1,631		37,132
Other	—		—		1,512		1,419		3,677		3,175
	14,594		47,623		12,331		40,095		28,632		62,834
Non-Insurance:
Markel Ventures: Manufacturing	784,745		675,620		755,802		677,054		575,353		513,668
Markel Ventures: Non-Manufacturing	429,704		396,323		291,714		301,004		262,767		261,551
Investment management	56,455		46,190		—		—		—		—
Other	22,281		24,487		26,911		28,652		16,773		16,818
	1,293,185		1,142,620		1,074,427		1,006,710		854,893		792,037
Total	$	1,307,779	$	1,190,243	$	1,086,758	$	1,046,805	$	883,525	$	854,871

The Company's Markel Ventures operations primarily consist of controlling interests in various industrial and service businesses and are viewed by management as separate and distinct from the Company's insurance operations. While each of the businesses is operated independently from one another, management aggregates financial results into two industry groups: manufacturing and non-manufacturing.

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Employee Benefit Plans

12 Months Ended

Dec. 31, 2016

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

Employee Benefit Plans

Employee Benefit Plans

a)The Company maintains defined contribution plans for employees of its United States insurance operations in accordance with Section 401(k) of the U.S. Internal Revenue Code of 1986. Employees of the Company's Markel Ventures subsidiaries are provided post-retirement benefits under separate plans. The Company also provides various defined contribution plans for employees of its international insurance and non-insurance operations, which are in line with local market terms and conditions of employment. Expenses relating to the Company's defined contribution plans were $30.1 million, $27.7 million and $27.2 million in 2016, 2015 and 2014, respectively.

b)The Terra Nova Pension Plan is a defined benefit plan which covers certain employees in our international insurance operations who meet the eligibility conditions set out in the plan. The plan has been closed to new participants since 2001. The cost of providing pensions for employees is charged to earnings over the average working life of employees according to actuarial recommendations. Final benefits are based on the employee's years of credited service and the higher of pensionable compensation received in the calendar year preceding retirement or the best average pensionable compensation received in any three consecutive years in the ten years preceding retirement. Effective April 1, 2012, employees are no longer accruing benefits for future service in the Terra Nova Pension Plan. The Company uses December 31 as the measurement date for the Terra Nova Pension Plan.

The following table summarizes the funded status of the Terra Nova Pension Plan and the amounts recognized on the accompanying consolidated balance sheets of the Company.

	Years Ended December 31,
(dollars in thousands)	2016			2015
Change in projected benefit obligation:
Projected benefit obligation at beginning of period	$	170,005		$	185,556
Interest cost	6,113			6,645
Plan settlements	—			(2,863		)
Benefits paid	(3,322		)	(3,970		)
Actuarial loss (gain)	38,485			(6,051		)
Effect of foreign currency rate changes	(32,663		)	(9,312		)
Projected benefit obligation at end of year	$	178,618		$	170,005
Change in plan assets:
Fair value of plan assets at beginning of period	$	186,727		$	201,399
Actual gain on plan assets	22,367			2,246
Employer contributions	3,577			—
Plan settlements	—			(2,766		)
Benefits paid	(3,322		)	(3,970		)
Effect of foreign currency rate changes	(33,705		)	(10,182		)
Fair value of plan assets at end of year	$	175,644		$	186,727
Funded status of the plan	$	(2,974	)	$	16,722
Net actuarial pension loss	85,110			61,818
Total	$	82,136		$	78,540

Net actuarial pension loss is recognized as a component of accumulated other comprehensive income, net of taxes. The asset or liability for pension benefits, also referred to as the funded status of the plan, at December 31, 2016 and 2015 was included in other assets on the consolidated balance sheets.

The following table presents the changes in plan assets and projected benefit obligation recognized in accumulated other comprehensive income.

	Years Ended December 31,
(dollars in thousands)	2016			2015			2014
Net actuarial loss	$	(25,243	)	$	(3,102	)	$	(20,521	)
Settlement loss recognized	—			343			—
Amortization of:
Net actuarial loss	1,951			2,319			1,589
Prior service costs	—			—			495
Tax benefit	4,192			88			3,687
Total other comprehensive loss	$	(19,100	)	$	(352	)	$	(14,750	)

The following table summarizes the components of net periodic benefit income and the weighted average assumptions for the Terra Nova Pension Plan.

	Years Ended December 31,
(dollars in thousands)	2016			2015			2014
Components of net periodic benefit income:
Interest cost	$	6,113		$	6,645		$	7,572
Expected return on plan assets	(9,124		)	(11,496		)	(12,812		)
Amortization of prior service cost	—			—			495
Amortization of net actuarial pension loss	1,951			2,319			1,589
Settlement loss recognized	—			343			—
Net periodic benefit income	$	(1,060	)	$	(2,189	)	$	(3,156	)
Weighted average assumptions as of December 31:
Discount rate	2.7		%	4.0		%	3.8		%
Expected return on plan assets	4.5		%	5.4		%	6.0		%
Rate of compensation increase	3.0		%	2.9		%	2.9		%

The projected benefit obligation and the net periodic benefit income are determined by independent actuaries using assumptions provided by the Company. In determining the discount rate, the Company uses the current yield on high-quality, fixed maturity investments that have maturities corresponding to the anticipated timing of estimated defined benefit payments. The decrease in the weighted average discount rate from 2015 to 2016 is due to a decrease in the yields on securities used to determine the discount rate during 2016. The expected return on plan assets is estimated based upon the anticipated average yield on plan assets using asset return assumptions for each asset class, and the cross-correlations between the asset classes, over a specified projection horizon. The decrease in the weighted average expected return on plan assets from 2015 to 2016 is due to changes in market conditions during 2016 that impacted projected returns. The rate of compensation increase is based upon historical experience and management's expectation of future compensation.

Management's discount rate and rate of compensation increase assumptions at December 31, 2016 were used to calculate the Company's projected benefit obligation. Management's discount rate, expected return on plan assets and rate of compensation increase assumptions at December 31, 2015 were used to calculate the net periodic benefit income for 2016. The Company estimates that net periodic benefit cost in 2017 will include an expense of $3.5 million resulting from the amortization of the net actuarial pension loss included as a component of accumulated other comprehensive income at December 31, 2016.

The fair values of each of the plan's assets are measured using quoted prices in active markets for identical assets, which represent Level 1 inputs within the fair value hierarchy established in FASB ASC 820-10. The following table summarizes the fair value of plan assets as of December 31, 2016 and 2015.

	December 31,
(dollars in thousands)	2016		2015
Plan assets:
Fixed maturity index funds	$	103,218	$	107,033
Equity security index funds	72,419		79,686
Cash and cash equivalents	7		8
Total	$	175,644	$	186,727

During 2014, the Company revised the target asset allocation and adjusted the investment balances to reduce risk while maintaining long-term return objectives. The Company's target asset allocation for the plan is 47% equity securities and 53% fixed maturities. At December 31, 2016, the actual allocation of assets in the plan was 41% equity securities and 59% fixed maturities. At December 31, 2015, the actual allocation of assets in the plan was 43% equity securities and 57% fixed maturities.

Investments are managed by a third party investment manager. Equity securities are invested in an index fund where 30% is indexed to United Kingdom equities and 70% is indexed to other markets. Assets are also invested in a mutual fund with a diversified global portfolio of equities, investment grade debt, property and cash. The primary objective of investing in these funds is to earn rates of return that are consistently in excess of inflation. Investing in equity securities, historically, has provided rates of return that are higher than investments in fixed maturities. Fixed maturity investments are allocated between five mutual funds; two index funds that include United Kingdom government securities, one index fund that includes securities issued by other foreign governments, one mutual fund that includes investment grade corporate bonds from the United Kingdom and foreign markets and one index fund that includes United Kingdom corporate securities. The assets in these funds are invested to meet the Company's obligations for current pensioners and those individuals nearing retirement. The plan does not invest in the Company's common shares.

At December 31, 2016 and 2015, the fair value of plan assets exceeded the plan's accumulated benefit obligation of $175.1 million and $164.8 million, respectively. The Company expects to make plan contributions of $3.2 million in 2017.

The benefits expected to be paid in each year from 2017 to 2021 are $3.0 million, $3.1 million, $3.1 million, $3.2 million and $3.3 million, respectively. The aggregate benefits expected to be paid in the five years from 2022 to 2026 are $17.4 million. The expected benefits to be paid are based on the same assumptions used to measure the Company's projected benefit obligation at December 31, 2016.

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Markel Corporation (Parent Company Only) Financial Information

12 Months Ended

Dec. 31, 2016

Condensed Financial Information of Parent Company Only Disclosure [Abstract]

Markel Corporation (Parent Company Only) Financial Information

Markel Corporation (Parent Company Only) Financial Information

The following parent company only condensed financial information reflects the financial position, results of operations and cash flows of Markel Corporation.

CONDENSED BALANCE SHEETS

	December 31,
	2016		2015
	(dollars in thousands)
ASSETS
Investments, available-for-sale, at estimated fair value:
Fixed maturities (amortized cost of $51,181 in 2016 and $35,475 in 2015)	$	52,234	$	36,618
Equity securities (cost of $203,708 in 2016 and $204,289 in 2015)	367,156		311,405
Short-term investments (estimated fair value approximates cost)	1,729,400		755,619
Total Investments	2,148,790		1,103,642
Cash and cash equivalents	369,641		460,271
Restricted cash and cash equivalents	1,013		670
Receivables	20,477		17,200
Investments in consolidated subsidiaries	8,107,450		7,961,315
Notes receivable from subsidiaries	60,110		212,636
Other assets	97,364		89,747
Total Assets	$	10,804,845	$	9,845,481
LIABILITIES AND SHAREHOLDERS' EQUITY
Senior long-term debt	$	1,944,171	$	1,633,068
Notes payable to subsidiaries	285,000		300,000
Income taxes payable	25,240		4,262
Net deferred tax liability	25,902		7,498
Other liabilities	63,605		66,503
Total Liabilities	2,343,918		2,011,331
Total Shareholders' Equity	8,460,927		7,834,150
Total Liabilities and Shareholders' Equity	$	10,804,845	$	9,845,481

CONDENSED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME

	Years Ended December 31,
	2016			2015			2014
	(dollars in thousands)
REVENUES
Net investment income	$	9,561		$	2,565		$	5,354
Dividends on common stock of consolidated subsidiaries	349,622			187,496			217,121
Net realized investment gains:
Other-than-temporary impairment losses	(98		)	(3,455		)	(120		)
Net realized investment gains, excluding other-than-temporary impairment losses	1,166			75,000			3,873
Net realized investment gains	1,068			71,545			3,753
Total Revenues	360,251			261,606			226,228
EXPENSES
Interest expense	116,013			95,620			94,097
Loss on early extinguishment of debt	44,100			—			—
Other expenses	13,076			11,287			2,685
Total Expenses	173,189			106,907			96,782
Income Before Equity in Undistributed Earnings of Consolidated Subsidiaries and Income Taxes	187,062			154,699			129,446
Equity in undistributed earnings of consolidated subsidiaries	196,615			407,489			163,341
Income tax benefit	(72,012		)	(20,584		)	(28,395		)
Net Income to Shareholders	$	455,689		$	582,772		$	321,182
OTHER COMPREHENSIVE INCOME (LOSS) TO SHAREHOLDERS
Change in net unrealized gains on investments, net of taxes:
Net holding gains (losses) arising during the period	$	37,045		$	(41,861	)	$	32,118
Consolidated subsidiaries' net holding gains (losses) arising during the period	238,616			(198,309		)	655,617
Consolidated subsidiaries' change in unrealized other-than-temporary impairment losses on fixed maturities arising during the period	35			160			173
Reclassification adjustments for net gains included in net income to shareholders	(558		)	(45,273		)	(1,874		)
Consolidated subsidiaries' reclassification adjustments for net gains included in net income to shareholders	(32,970		)	(35,209		)	(24,287		)
Change in net unrealized gains on investments, net of taxes	242,168			(320,492		)	661,747
Change in foreign currency translation adjustments, net of taxes	(1,326		)	2,970			1,949
Consolidated subsidiaries' change in foreign currency translation adjustments, net of taxes	(10,384		)	(32,175		)	(34,194		)
Consolidated subsidiaries' change in net actuarial pension loss, net of taxes	(19,100		)	(352		)	(14,750		)
Total Other Comprehensive Income (Loss) to Shareholders	211,358			(350,049		)	614,752
Comprehensive Income to Shareholders	$	667,047		$	232,723		$	935,934

CONDENSED STATEMENTS OF CASH FLOWS

	Years Ended December 31,
	2016			2015			2014
	(dollars in thousands)
OPERATING ACTIVITIES
Net income to shareholders	$	455,689		$	582,772		$	321,182
Adjustments to reconcile net income to shareholders to net cash provided by operating activities	(120,564		)	(464,193		)	(218,396		)
Net Cash Provided By Operating Activities	335,125			118,579			102,786
INVESTING ACTIVITIES
Proceeds from sales of fixed maturities and equity securities	1,831			100,633			9,306
Proceeds from maturities, calls and prepayments of fixed maturities	11,960			24,945			15,710
Cost of fixed maturities and equity securities purchased	(29,110		)	(55,656		)	(687		)
Net change in short-term investments	(970,364		)	9,956			(109,728		)
Securities received from subsidiaries as dividends, repayment of notes receivable and return of capital	238,975			—			89,996
Return of capital from subsidiaries	21,021			—			—
Decrease in notes receivable due from subsidiaries	92,530			—			28,506
Capital contributions to subsidiaries	—			(228,578		)	(74,788		)
Cost of equity method investments	(3,100		)	(13,164		)	—
Change in restricted cash and cash equivalents	(343		)	289			51
Additions to property and equipment	(584		)	(305		)	(342		)
Other	(3,207		)	(376		)	(2,150		)
Net Cash Used By Investing Activities	(640,391		)	(162,256		)	(44,126		)
FINANCING ACTIVITIES
Additions to senior long-term debt	493,149			—			—
Increase in notes payable to subsidiaries	—			285,000			—
Repayment and retirement of senior long-term debt	(183,343		)	(2,000		)	—
Premiums and fees related to early extinguishment of debt	(43,691		)	—			—
Repurchases of common stock	(51,142		)	(31,491		)	(26,053		)
Issuance of common stock	4,623			4,752			5,691
Other	(4,960		)	3,985			(1,948		)
Net Cash Provided (Used) By Financing Activities	214,636			260,246			(22,310		)
Increase (decrease) in cash and cash equivalents	(90,630		)	216,569			36,350
Cash and cash equivalents at beginning of year	460,271			243,702			207,352
CASH AND CASH EQUIVALENTS AT END OF YEAR	$	369,641		$	460,271		$	243,702

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Quarterly Financial Information

12 Months Ended

Dec. 31, 2016

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Information

Quarterly Financial Information (unaudited)

The following table presents the unaudited quarterly results of consolidated operations for 2016, 2015 and 2014.

	Quarters Ended
(dollars in thousands, except per share amounts)	Mar. 31		June 30			Sept. 30			Dec. 31
2016
Operating revenues	$	1,376,182	$	1,375,937		$	1,431,282		$	1,428,625
Net income	163,646		80,673			83,421			132,703
Net income to shareholders	160,370		78,797			83,796			132,726
Comprehensive income (loss) to shareholders	396,994		209,942			89,161			(29,050		)
Net income per share:
Basic	$	11.21	$	5.44		$	5.62		$	9.14
Diluted	11.15		5.41			5.60			9.11
Common stock price ranges:
High	$	895.03	$	989.18		$	961.78		$	931.94
Low	805.03		880.01			909.84			811.05
2015
Operating revenues	$	1,302,154	$	1,304,605		$	1,342,764		$	1,420,460
Net income	194,006		92,453			104,410			198,273
Net income to shareholders	190,992		91,369			102,519			197,892
Comprehensive income (loss) to shareholders	281,807		(132,925		)	(51,143		)	134,984
Net income per share:
Basic	$	13.57	$	6.76		$	7.43		$	14.23
Diluted	13.49		6.72			7.39			14.14
Common stock price ranges:
High	$	783.50	$	821.00		$	898.08		$	937.91
Low	660.05		736.96			775.00			791.97
2014
Operating revenues	$	1,239,655	$	1,258,971		$	1,299,286		$	1,335,755
Net income	87,501		41,141			76,824			118,222
Net income to shareholders	87,716		40,068			75,803			117,595
Comprehensive income to shareholders	230,273		250,588			36,502			418,571
Net income per share:
Basic	$	6.28	$	2.67		$	5.33		$	8.10
Diluted	6.25		2.66			5.30			8.05
Common stock price ranges:
High	$	596.87	$	655.75		$	666.00		$	707.36
Low	527.17		593.76			623.90			632.65

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Summary Of Significant Accounting Policies (Policy)

12 Months Ended

Dec. 31, 2016

Accounting Policies [Abstract]

Basis of Presentation

Basis of Presentation. The accompanying consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (U.S. GAAP) and include the accounts of Markel Corporation and its consolidated subsidiaries, as well as any variable interest entities (VIEs) that meet the requirements for consolidation (the Company). All significant intercompany balances and transactions have been eliminated in consolidation. The Company consolidates the results of its Markel Ventures subsidiaries on a one-month lag. Certain prior year amounts have been reclassified to conform to the current presentation.

Use of Estimates

Use of Estimates. The preparation of financial statements in accordance with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses and the disclosure of contingent assets and liabilities. Management periodically reviews its estimates and assumptions. Quarterly reviews include evaluating the adequacy of reserves for unpaid losses and loss adjustment expenses, life and annuity reinsurance benefit reserves, litigation contingencies, the reinsurance allowance for doubtful accounts and income tax liabilities, as well as analyzing the recoverability of deferred tax assets, estimating reinsurance premiums written and earned and evaluating the investment portfolio for other-than-temporary declines in estimated fair value. Estimates and assumptions for goodwill and intangible assets are reviewed in conjunction with an acquisition, and goodwill and indefinite-lived intangible assets are reassessed at least annually for impairment. Actual results may differ materially from the estimates and assumptions used in preparing the consolidated financial statements.

Investments

Investments. Available-for-sale investments are recorded at estimated fair value. Unrealized gains and losses on investments, net of income taxes, are included in accumulated other comprehensive income in shareholders' equity. The Company completes a detailed analysis each quarter to assess whether the decline in the fair value of any investment below its cost basis is deemed other-than-temporary.

Premiums and discounts are amortized or accreted over the lives of the related fixed maturities as an adjustment to the yield using the effective interest method. Dividend and interest income are recognized when earned. Realized investment gains or losses are included in earnings. Realized gains or losses from sales of investments are derived using the first-in, first-out method.

The Company also has certain investments in fixed maturity and equity securities that are recorded at estimated fair value with changes in unrealized gains and losses recorded in net income. These fixed maturity and equity security investments totaled $41.4 million and $191.2 million, respectively, as of December 31, 2016 and are included in fixed maturities and equity securities in the consolidated balance sheets.

Investments accounted for under the equity method of accounting are recorded at cost within other assets on the consolidated balance sheets and subsequently increased or decreased by the Company's proportionate share of the net income or loss of the investee. The Company records its proportionate share of net income or loss of the investee in net investment income. The Company records its proportionate share of other comprehensive income or loss of the investee as a component of other comprehensive income (loss). Dividends or other equity distributions are recorded as a reduction of the investment. The Company reviews equity method investments for impairment when events or circumstances indicate that a decline in the fair value of the investment below its carrying value is other-than-temporary.

Cash and Cash Equivalents

Cash and Cash Equivalents. The Company considers all investments with original maturities of 90 days or less to be cash equivalents. The carrying value of the Company's cash and cash equivalents and restricted cash and cash equivalents approximates fair value.

Receivables

Receivables. Receivables include amounts receivable from agents, brokers and insureds, which represent premiums that are both currently due and amounts not yet due on insurance and reinsurance policies. Premiums for insurance policies are generally due at inception. Premiums for reinsurance policies generally become due over the period of coverage based on the policy terms. The Company monitors the credit risk associated with premiums receivable, taking into consideration the fact that in certain instances credit risk may be reduced by the Company's right to offset loss obligations or unearned premiums against premiums receivable. Amounts deemed uncollectible are charged to net income in the period they are determined. Changes in the estimate of reinsurance premiums written will result in an adjustment to premiums receivable in the period they are determined.

Reinsurance Recoverables

Reinsurance Recoverables. Amounts recoverable from reinsurers are estimated in a manner consistent with the claim liability associated with the reinsured business. Allowances are established for amounts deemed uncollectible and reinsurance recoverables are recorded net of these allowances. The Company evaluates the financial condition of its reinsurers and monitors concentration risk to minimize its exposure to significant losses from individual reinsurers.

Deferred Policy Acquisition Costs

Deferred Policy Acquisition Costs. Costs directly related to the acquisition of insurance premiums are deferred and amortized over the related policy period, generally one year. The Company only defers acquisition costs incurred that are related directly to the successful acquisition of new or renewal insurance contracts, including commissions to agents and brokers and premium taxes. Commissions received related to reinsurance premiums ceded are netted against broker commissions in determining acquisition costs eligible for deferral. To the extent that future policy revenues on existing policies are not adequate to cover related costs and expenses, deferred policy acquisition costs are charged to earnings. The Company does not consider anticipated investment income in determining whether a premium deficiency exists.

Goodwill and Intangible Assets

Goodwill and Intangible Assets. Goodwill and intangible assets are recorded as a result of business acquisitions. Goodwill represents the excess of the amount paid to acquire a business over the net fair value of assets acquired and liabilities assumed at the date of acquisition. Indefinite-lived and other intangible assets are recorded at fair value as of the acquisition date. The determination of the fair value of certain assets acquired and liabilities assumed involves significant judgment and the use of valuation models and other estimates, which require assumptions that are inherently subjective. Goodwill and indefinite-lived intangible assets are tested for impairment at least annually. The Company completes an annual test during the fourth quarter of each year based upon the results of operations through September 30. Intangible assets with definite lives are amortized using the straight-line method over their estimated useful lives, generally five to 20 years, and are reviewed for impairment when events or circumstances indicate that their carrying value may not be recoverable.

Property and Equipment

Property and Equipment. Property and equipment are stated at cost less accumulated depreciation and amortization. Depreciation and amortization of property and equipment are calculated using the straight-line method over the estimated useful lives (generally, the lower of the life of the lease or the estimated useful life for leasehold improvements, ten to 40 years for buildings, seven to 40 years for land improvements, three to ten years for furniture and equipment and three to 25 years for other property and equipment).

Redeemable Noncontrolling Interests

Redeemable Noncontrolling Interests. The Company owns controlling interests in various companies through its Markel Ventures operations. In some cases, the Company has the option to acquire the remaining equity interests, and the remaining equity interests have the option to sell their interests to the Company, in the future. The redemption value of the remaining equity interests is generally based on the respective company's earnings in specified periods preceding the redemption date. The redeemable noncontrolling interests generally become redeemable through 2020.

The Company recognizes changes in the redemption value that exceed the carrying value of redeemable noncontrolling interests to retained earnings as if the balance sheet date were also the redemption date. Changes in the redemption value also result in an adjustment to net income to shareholders in the calculation of basic and diluted net income per share. The change in the redemption value of redeemable noncontrolling interests in 2016, 2015 and 2014 resulted in an adjustment to retained earnings of a decrease of $15.5 million, an increase of $4.1 million, and a decrease of $8.2 million, respectively.

Income Taxes

Income Taxes. The Company records deferred income taxes to reflect the net tax effect of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and their tax bases. Deferred tax assets are reduced by a valuation allowance when management believes it is more likely than not that some, or all, of the deferred tax assets will not be realized. The Company recognizes the tax benefit from an uncertain tax position taken or expected to be taken in income tax returns only if it is more likely than not that the tax position will be sustained upon examination by tax authorities, based on the technical merits of the position. Tax positions that meet the more likely than not threshold are then measured using a probability weighted approach, whereby the largest amount of tax benefit that is greater than 50% likely of being realized upon ultimate settlement is recognized. The Company recognizes interest and penalties related to uncertain tax positions in income tax expense.

Unpaid Losses and Loss Adjustment Expenses

Unpaid Losses and Loss Adjustment Expenses. Unpaid losses and loss adjustment expenses on our property and casualty insurance business are based on evaluations of reported claims and estimates for losses and loss adjustment expenses incurred but not reported. Estimates for losses and loss adjustment expenses incurred but not reported are based on reserve development studies, among other things. The Company does not discount reserves for losses and loss adjustment expenses to reflect estimated present value, except for reserves assumed in connection with an acquisition, which are recorded at fair value at the acquisition date. Recorded reserves are estimates, and the ultimate liability may be greater or less than the estimates.

Life and Annuity Benefits

Life and Annuity Benefits. The Company previously acquired a block of long duration reinsurance contracts for life and annuity benefits which subject the Company to mortality, longevity and morbidity risks. The assumptions used to determine policy benefit reserves are generally locked-in for the life of the contract unless an unlocking event occurs. To the extent existing policy reserves, together with the present value of future gross premiums and expected investment income earned thereon, are not adequate to cover the present value of future benefits, settlement and maintenance costs, the locked-in assumptions are revised to current best estimate assumptions and a charge to earnings for life and annuity benefits is recognized at that time. Because of the assumptions and estimates used in establishing reserves for life and annuity benefit obligations and the long-term nature of these reinsurance contracts, the ultimate liability may be greater or less than the estimates.

Results attributable to the run-off of life and annuity reinsurance business are included in other revenues and other expenses in the Company's consolidated statements of income and comprehensive income and as part of the Company's Other Insurance (Discontinued Lines) segment.

Revenue Recognition

Revenue Recognition.

Property and Casualty Premiums

Insurance premiums are generally earned on a pro rata basis over the policy period, typically one year. The cost of reinsurance ceded is initially recorded as prepaid reinsurance premiums and is amortized over the reinsurance contract period in proportion to the amount of insurance protection provided. Premiums ceded are netted against premiums written.

Assumed reinsurance premiums are recorded at the inception of each contract based upon contract terms and information received from cedents and brokers and are earned on a pro rata basis over the coverage period, or for multi-year contracts, in proportion with the underlying risk exposure to the extent there is variability in the exposure through the coverage period. Changes in reinsurance premium estimates are expected and may result in significant adjustments in any period. These estimates change over time as additional information regarding changes in underlying exposures is obtained. Any subsequent differences arising on such estimates are recorded as premiums written in the period they are determined and are earned on a pro rata basis over the coverage period. The Company uses the periodic method to account for assumed reinsurance from foreign reinsurers. The Company's foreign reinsurers provide sufficient information to record foreign assumed business in the same manner as the Company records assumed business from United States reinsurers.

Certain contracts that the Company writes provide for reinstatement of coverage. Reinstatement premiums are the premiums for the restoration of the insurance or reinsurance limit of a contract to its full amount after a loss occurrence by the insured or reinsured. The Company accrues for reinstatement premiums resulting from losses recorded. Such accruals are based upon contractual terms and management judgment is involved with respect to the amount of losses recorded. Changes in estimates of losses recorded on contracts with reinstatement premium features will result in changes in reinstatement premiums based on contractual terms. Reinstatement premiums are recognized at the time losses are recorded and are earned on a pro-rata basis over the coverage period.

Other Revenues

Other revenues primarily relate to the Company's Markel Ventures operations and consist of revenues from the sale of manufactured products and service revenues. Revenues from manufactured products are generally recognized at the time title transfers to the customer, which typically occurs at the point of shipment or delivery to the customer, depending on the terms of the sales arrangement. Revenues from services are generally recognized as the services are performed. Services provided pursuant to a contract are recognized either over the contract period or upon completion of the elements specified in the contract, depending on the terms of the contract.

Investment management fee income is recognized over the period in which investment management services are provided and is calculated and billed monthly based on the net asset value of the accounts managed. Performance fee arrangements entitle the Company to participate, on a fixed-percentage basis, in any net income generated in excess of an agreed-upon threshold as established by the underlying investment management agreements. In general, net income is calculated at the end of each calendar year and performance fees are payable annually. Following the preferred method identified in the Accounting Standards Codification (ASC) Topic 605, Revenue Recognition, such performance fee income is recorded at the conclusion of the contractual performance period, when all contingencies are resolved.

Stock-based Compensation

Stock-based Compensation. Stock-based compensation expense is generally recognized as part of underwriting, acquisition and insurance expenses over the requisite service period. Stock-based compensation expense, net of taxes, was $14.3 million in 2016, $16.3 million in 2015 and $18.7 million in 2014. See note 12.

Foreign Currency Translation

Foreign Currency Translation. The functional currencies of the Company's foreign operations are the currencies in which the majority of their business is transacted. Assets and liabilities of foreign operations are translated into the United States Dollar using the exchange rates in effect at the balance sheet date. Revenues and expenses of foreign operations are translated using the average exchange rate for the period. Gains or losses from translating the financial statements of foreign operations denominated in a functional currency are included, net of taxes, in shareholders' equity as a component of accumulated other comprehensive income. Gains and losses arising from transactions denominated in a foreign currency other than a functional currency are included in net income.

The Company manages its exposure to foreign currency risk primarily by matching assets, other than goodwill and intangible assets, and liabilities denominated in the same currency. To the extent that assets and liabilities in foreign currencies are not matched, the Company is exposed to foreign currency risk. For functional currencies, the related exchange rate fluctuations are reflected in other comprehensive income (loss). The cumulative foreign currency translation adjustment, net of taxes, was a loss of $84.4 million and $72.7 million at December 31, 2016 and 2015, respectively.

Derivative Financial Instruments

Derivative Financial Instruments. Derivative instruments, including derivative instruments resulting from hedging activities, are measured at fair value and recognized as either assets or liabilities on the consolidated balance sheets. The changes in fair value of derivatives are recognized in earnings unless the derivative is designated as a hedge and qualifies for hedge accounting.

The Company's foreign currency forward contracts are generally designated and qualify as hedges of a net investment in a foreign operation. The effective portion of the change in fair value resulting from these hedges is reported in currency translation adjustments as part of other comprehensive income (loss). The ineffective portion of the change in fair value is recognized in earnings.

Comprehensive Income

Comprehensive Income. Comprehensive income represents all changes in equity that result from recognized transactions and other economic events during the period. Other comprehensive income (loss) refers to revenues, expenses, gains and losses that under U.S. GAAP are included in comprehensive income but excluded from net income, such as unrealized gains or losses on investments, foreign currency translation adjustments and changes in net actuarial pension loss.

Net Income Per Share

Net Income Per Share. Basic net income per share is computed by dividing adjusted net income to shareholders by the weighted average number of common shares outstanding during the year. Diluted net income per share is computed by dividing adjusted net income to shareholders by the weighted average number of common shares and dilutive potential common shares outstanding during the year. See note 12(b).

Variable Interest Entities

Variable Interest Entities. The Company determines whether it has relationships with entities defined as VIEs in accordance with ASC Topic 810, Consolidation. Under this guidance, a VIE is consolidated by the variable interest holder that is determined to be the primary beneficiary.

An entity in which the Company holds a variable interest is a VIE if any of the following conditions exist: (a) the total equity investment at risk is not sufficient to permit the entity to finance its activities without additional subordinated financial support, (b) as a group, the holders of equity investment at risk lack either the direct or indirect ability through voting rights or similar rights to make decisions about an entity's activities that most significantly impact the entity's economic performance or the obligation to absorb the expected losses or right to receive the expected residual returns, or (c) the voting rights of some investors are disproportionate to their obligation to absorb the expected losses of the entity, their rights to receive the expected residual returns of the entity, or both and substantially all of the entity's activities either involve or are conducted on behalf of an investor with disproportionately few voting rights.

The primary beneficiary is defined as the variable interest holder that is determined to have the controlling financial interest as a result of having both (a) the power to direct the activities of a VIE that most significantly impact the economic performance of the VIE and (b) the obligation to absorb losses or right to receive benefits from the VIE that could potentially be significant to the VIE.

The Company determines whether an entity is a VIE at the inception of our variable interest in the entity and upon the occurrence of certain reconsideration events. The Company continually reassesses whether it is the primary beneficiary of VIEs in which it holds a variable interest.

Recent Accounting Pronouncements

Recent Accounting Pronouncements.

Effective January 1, 2016, the Company adopted Financial Accounting Standards Board (FASB) Accounting Standards Update (ASU) No. 2015-02, Consolidation (Topic 810): Amendments to the Consolidation Analysis, which changes the way reporting enterprises evaluate whether (a) they should consolidate limited partnerships and similar entities, (b) fees paid to a decision maker or service provider are variable interests in a VIE, and (c) variable interests in a VIE held by related parties of the reporting enterprise require the reporting enterprise to consolidate the VIE. It also eliminates the VIE consolidation model based on majority exposure to variability that applied to certain investment companies and similar entities. The ASU also significantly changes how to evaluate voting rights for entities that are not similar to limited partnerships when determining whether the entity is a VIE, which may affect entities for which the decision making rights are conveyed through a contractual arrangement. The adoption of this guidance did not result in any changes to our previous consolidation conclusions.

Effective January 1, 2016, the Company adopted FASB ASU No. 2015-03, Interest-Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs. ASU No. 2015-03 requires that debt issuance costs related to a recognized debt liability be presented on the balance sheet as a direct deduction from the debt liability, similar to the presentation of debt discounts. The cost of issuing debt is no longer recorded as a separate asset on the balance sheet. The amortization of debt issuance costs continues to be included in interest expense. ASU No. 2015-03 was applied retrospectively to all periods presented. As a result, debt issuance costs totaling $2.2 million and $2.6 million were reclassified from other assets to senior long-term debt and other debt as of December 31, 2015 and December 31, 2014, respectively.The adoption of this ASU did not have an impact on the Company's results of operations or cash flows.

Effective January 1, 2016, the Company adopted FASB ASU No. 2015-05, Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer's Accounting for Fees Paid in a Cloud Computing Arrangement, which clarifies that software licenses contained in a cloud computing arrangement should be capitalized if the customer has the right to take possession of the software and the ability to run the software outside of the cloud computing arrangement. The adoption of this ASU did not have an impact on the Company's financial position, results of operations or cash flows.

Effective January 1, 2016, the Company adopted FASB ASU No. 2015-16, Business Combinations (Topic 805): Simplifying the Accounting for Measurement-Period Adjustments. ASU No. 2015-16 eliminates the requirement to retrospectively adjust the financial statements for measurement-period adjustments that occur in periods after a business combination is consummated. The adoption of this ASU did not have an impact on the Company's financial position, results of operations or cash flows and will be applied on a prospective basis, as applicable.

During the second quarter of 2016, the Company early adopted FASB ASU No. 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting, which changes several aspects of the accounting for share-based payment award transactions. Under the new guidance, all excess tax benefits or deficiencies associated with share-based payment award transactions are required to be recognized as an income tax benefit or expense in net income when the awards vest or are settled, with the corresponding cash flows recognized as an operating activity in the statement of cash flows. Excess tax benefits and deficiencies are no longer recognized in additional paid-in-capital. The new guidance also allows an employer to repurchase more of an employee's shares for tax witholding purposes without triggering liability accounting and to make a policy election to account for forfeitures as they occur, rather than estimating forfeitures upon issuance of the award. Upon adoption of ASU No. 2016-09, the Company elected to account for forfeitures as they occur, which had no impact on the consolidated financial statements. The provisions of ASU No. 2016-09 were adopted as of January 1, 2016 on a prospective basis and did not have a material impact on the Company's financial position, results of operations or cash flows.

Effective for the year ended December 31, 2016, the Company adopted FASB ASU No. 2015-09, Financial Services-Insurance (Topic 944): Disclosures about Short-Duration Contracts. ASU No. 2015-09 requires significant new disclosures for insurers relating to short-duration insurance contract claims and the unpaid claims liability rollforward for long and short-duration contracts. The guidance requires annual tabular disclosure, on a disaggregated basis, of undiscounted incurred and paid claim and allocated claim adjustment expense development by accident year, net of reinsurance, for up to 10 years. Tables must also include the total incurred but not reported claims liabilities, plus expected development on reported claims, and claims frequency for each accident year. A description of estimation methodologies and any significant changes in methodologies and assumptions used to calculate the liability and frequency is also required. Based on the disaggregated claims information in the tables, disclosure of historical average annual percentage payout of incurred claims is also required. The ASU requires retrospective application by providing comparative disclosures for each period presented, other than those that are only required for the most recent reporting period. These new annual disclosures have been included in note 9. Interim period disclosures must include a tabular rollforward and related qualitative information for the liability for unpaid losses and loss adjustment expenses. The interim disclosures are required beginning in the first quarter of 2017.

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), which creates a new comprehensive revenue recognition standard that will serve as a single source of revenue guidance for all companies in all industries. The guidance applies to all companies that either enter into contracts with customers to transfer goods or services or enter into contracts for the transfer of nonfinancial assets, unless those contracts are within the scope of other standards, such as insurance contracts. ASU No. 2014-09's core principle is that a company will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. In doing so, companies will need to use more judgment and make more estimates than under the current guidance. These may include identifying performance obligations in the contract, estimating the amount of variable consideration to include in the transaction price and allocating the transaction price to each separate performance obligation. ASU No. 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Consideration (Reporting Revenue Gross versus Net), ASU No. 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing, ASU No. 2016-12, Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients and ASU No. 2016-20, Technical Corrections and Improvements to Topic 606, Revenue from Contracts with Customers were all issued in 2016 as amendments to ASU No. 2014-09. These amendments will be evaluated and adopted in conjunction with ASU No. 2014-09. The Company expects to adopt ASU No. 2014-09 as of January 1, 2018 using the modified retrospective method, whereby the cumulative effect of adoption will be recognized at the date of initial application. The adoption of this ASU will not impact the Company's insurance premium revenues or revenues from its investment portfolio, which totaled 77% of consolidated revenues for the year ended December 31, 2016, but will impact the Company's other revenues, which are primarily attributable to its non-insurance operations. The Company has completed an inventory of revenue streams from its non-insurance operations, which are comprised of a diverse portfolio of contracts across various industries, and is currently evaluating changes, if any, that will be necessary. The Company has not determined the full impact that adopting the new accounting guidance will have on its consolidated financial statements.

In July 2015, the FASB issued ASU No. 2015-11, Inventory (Topic 330): Simplifying the Measurement of Inventory. The ASU changes the measurement principle for inventory from the lower of cost or market to lower of cost and net realizable value and eliminates the requirement to consider replacement cost or net realizable value less an approximately normal profit margin when measuring inventory. ASU No. 2015-11 becomes effective for the Company during the first quarter of 2017 and will be applied prospectively. Adoption of this ASU is not expected to have a material impact on the Company's financial position, results of operations or cash flows.

In January 2016, the FASB issued ASU No. 2016-01, Financial Instruments (Topic 825): Recognition and Measurement of Financial Assets and Financial Liabilities. The ASU significantly changes the income statement impact of equity investments and the recognition of changes in fair value of financial liabilities attributable to an entity's own credit risk when the fair value option is elected. The ASU requires equity instruments that do not result in consolidation and are not accounted for under the equity method to be measured at fair value and to recognize any changes in fair value in net income rather than other comprehensive income (loss). ASU No. 2016-01 becomes effective for the Company during the first quarter of 2018 and will be applied using a cumulative-effect adjustment to retained earnings as of the beginning of the fiscal year of adoption. The provisions related to equity investments without a readily determinable fair value will be applied prospectively to equity investments as of the adoption date. The Company is currently evaluating ASU No. 2016-01 to determine the impact that adopting this standard will have on the consolidated financial statements. Adoption of this ASU is not expected to have a material impact on the Company's financial position, cash flows, or total comprehensive income, but will have a material impact on the Company's results of operations as changes in fair value of equity instruments will be presented in net income rather than other comprehensive income (loss). As of December 31, 2016, accumulated other comprehensive income included $1.5 billion of net unrealized gains on equity securities, net of taxes. See note 3(f) for details regarding the change in net unrealized gains on equity securities included in other comprehensive income (loss) for the years ended December 31, 2016, 2015 and 2014.

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). The ASU requires lessees to record most leases on their balance sheets as a lease liability with a corresponding right-of-use asset, but continue to recognize the related leasing expense within net income. The guidance also eliminates real estate-specific provisions for all entities. For lessors, the guidance modifies the classification criteria and the accounting for sales-type and direct financing leases. ASU No. 2016-02 becomes effective for the Company during the first quarter of 2019 and will be applied under a modified retrospective approach for leases that exist or are entered into after the beginning of the earliest comparative period in the financial statements. See note 16 for details regarding the Company's minimum annual rental commitments payable directly by the Company for noncancelable operating leases at December 31, 2016, which will be subject to this new guidance. The calculation of the lease liability and right-of-use asset requires further analysis of the underlying leases to determine which portion of the underlying lease payments are required to be included in the calculation. The Company is currently evaluating ASU No. 2016-02 to determine the potential impact that adopting this standard will have on its consolidated financial statements.

In March 2016, the FASB issued ASU No. 2016-07, Investments - Equity Method and Joint Ventures (Topic 323): Simplifying the Transition to the Equity Method of Accounting. The ASU eliminates the requirement for an investor to retroactively apply the equity method when its increase in ownership interest or degree of influence in an investee triggers equity method accounting. ASU No. 2016-07 becomes effective for the Company during the first quarter of 2017 and will be applied prospectively. Early adoption is permitted. Adoption of this ASU is not expected to have an impact on the Company's financial position, results of operations or cash flows.

In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The ASU replaces the current incurred loss model used to measure impairment losses with an expected loss model for trade, reinsurance, and other receivables as well as financial instruments measured at amortized cost. For available-for-sale debt securities, which are measured at fair value, the ASU requires entities to record impairments as an allowance, rather than a reduction of the amortized cost, as is currently required under the other-than-temporary impairment model. ASU No. 2016-13 becomes effective for the Company during the first quarter of 2020 and will be applied using a modified-retrospective approach through a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective. The Company is currently evaluating ASU No. 2016-13 to determine the potential impact that adopting this standard will have on the consolidated financial statements. Application of the new expected loss model for measuring impairment losses will not impact the Company's investment portfolio, all of which is considered available-for sale, but will impact the Company's other financial assets, including its reinsurance recoverables. Upon adoption of this ASU, any impairment losses on the Company's available-for-sale debt securities will be recorded as an allowance, subject to reversal, rather than as a reduction in amortized cost.

In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments, which is intended to reduce diversity in practice in how certain transactions are classified in the statement of cash flows. Some of the topics covered by the ASU include the classification of debt prepayment and extinguishment costs, contingent consideration payments made after a business combination and distributions from equity method investees. ASU No. 2016-15 becomes effective for the Company during the first quarter of 2018 and will be applied using a retrospective transition approach. Early adoption is permitted. The Company is currently evaluating ASU No. 2016-15 to determine the potential impact that adopting this standard will have on the consolidated statements of cash flows. Adoption of this ASU will not impact the Company's financial position or results of operations and is not expected to have a material impact on the Company's consolidated statements of cash flows.

In October 2016, the FASB issued ASU No. 2016-16, Income Taxes (Topic 740): Intra-entity Transfers of Assets Other Than Inventory, which will require companies to account for the income tax effects of intercompany transfers of assets other than inventory when the transfer occurs. Intercompany transfers of assets across tax jurisdictions may have cash tax consequences and may be taxable events as proscribed by the applicable tax jurisdiction. Currently, companies are prohibited from recognizing those tax effects until the asset has been sold to an outside party. The income tax effects of intercompany inventory transactions will continue to be deferred. ASU No. 2016-16 becomes effective for the Company during the first quarter of 2018 and will be applied using a modified retrospective transition approach. Early adoption is permitted. Adoption of this ASU will not impact the Company's cash flows and is not expected to have a material impact on the Company's financial position or results of operations.

In October 2016, the FASBissuedASU No. 2016-17, Consolidation (Topic 810): Interests Held through Related Parties That Are under Common Control, which will require a single decision maker evaluating whether it is the primary beneficiary of a VIE to consider its indirect interests held by related parties that are under common control on a proportionate basis. Under the guidance the FASB issued last year, which was adopted by the Company effective January 1, 2016, the decision maker was required to consider those interests in their entirety. ASU No. 2016-17 becomes effective for the Company beginning in 2017 and will be applied retrospectively to 2016, the fiscal year in which the amendments in Update 2015-02 initially were applied, as described above. Adoption of this guidance is not expected to result in any changes to our previous consolidation conclusions.

In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash. The ASU requires that a statement of cash flows explain the change during the period of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. Currently, changes in restricted cash and cash equivalents are presented as operating, investing or financing activities on the statement of cash flows. ASU No. 2016-18 becomes effective for the Company during the first quarter of 2018 and will be applied using a retrospective approach for each period presented. The Company currently presents changes in restricted cash and cash equivalents on the face of the statements of cash flows as an investing activity. Upon adoption of this ASU, the Company's statements of cash flows will include restricted cash and cash equivalents in the beginning-of-period and end-of-period total amounts for cash, cash equivalents and restricted cash and cash equivalents. Adoption of this ASU will not impact the Company's financial position, results of operations or total comprehensive income (loss).

In January 2017, the FASB issued ASU No. 2017-04, Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. The ASU eliminates Step 2 of the goodwill impairment test, which is performed by estimating the fair value of individual assets and liabilities of the reporting unit to calculate the implied fair value of goodwill. Instead, an entity will record a goodwill impairment charge based on the excess of a reporting unit's carrying value over its estimated fair value, not to exceed the carrying amount of goodwill. ASU No. 2017-04 becomes effective for the Company during the first quarter of 2020 and will be applied prospectively. Early adoption is permitted. Adoption of this ASU is not expected to have a material impact on the Company's financial position, results of operations or cash flows.

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Investments (Tables)

12 Months Ended

Dec. 31, 2016

Investments, Debt and Equity Securities [Abstract]

Available-For-Sale Investments

The following tables summarize the Company's available-for-sale investments. Commercial and residential mortgage-backed securities include securities issued by U.S. government-sponsored enterprises and U.S. government agencies.

	December 31, 2016
(dollars in thousands)	Amortized Cost		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses			Unrealized Other- Than-Temporary Impairment Losses			Estimated Fair Value
Fixed maturity securities:
U.S. Treasury	$	259,379	$	99	$	(894	)	$	—		$	258,584
U.S. government-sponsored enterprises	418,457		9,083		(4,328		)	—			423,212
Obligations of states, municipalities and political subdivisions	4,324,332		145,678		(41,805		)	—			4,428,205
Foreign governments	1,306,324		159,291		(2,153		)	—			1,463,462
Commercial mortgage-backed	1,055,947		3,953		(19,544		)	—			1,040,356
Residential mortgage-backed	779,503		18,749		(5,048		)	(2,258		)	790,946
Asset-backed	27,494		2		(158		)	—			27,338
Corporate	1,420,298		49,146		(9,364		)	(673		)	1,459,407
Total fixed maturity securities	9,591,734		386,001		(83,294		)	(2,931		)	9,891,510
Equity securities:
Insurance, banks and other financial institutions	846,343		857,063		(5,596		)	—			1,697,810
Industrial, consumer and all other	1,635,105		1,421,080		(8,154		)	—			3,048,031
Total equity securities	2,481,448		2,278,143		(13,750		)	—			4,745,841
Short-term investments	2,336,100		57		(6		)	—			2,336,151
Investments, available-for-sale	$	14,409,282	$	2,664,201	$	(97,050	)	$	(2,931	)	$	16,973,502
	December 31, 2015
(dollars in thousands)	Amortized Cost		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses			Unrealized Other- Than-Temporary Impairment Losses			Estimated Fair Value
Fixed maturity securities:
U.S. Treasury	$	310,370	$	95	$	(1,048	)	$	—		$	309,417
U.S. government-sponsored enterprises	385,282		9,741		(3,733		)	—			391,290
Obligations of states, municipalities and political subdivisions	3,817,136		204,302		(8,225		)	—			4,013,213
Foreign governments	1,302,329		115,809		(1,681		)	—			1,416,457
Commercial mortgage-backed	657,670		6,867		(4,999		)	—			659,538
Residential mortgage-backed	837,964		22,563		(4,022		)	(2,258		)	854,247
Asset-backed	36,462		15		(406		)	—			36,071
Corporate	1,690,945		41,123		(16,209		)	(1,624		)	1,714,235
Total fixed maturity securities	9,038,158		400,515		(40,323		)	(3,882		)	9,394,468
Equity securities:
Insurance, banks and other financial institutions	651,002		690,271		(6,551		)	—			1,334,722
Industrial, consumer and all other	1,557,832		1,227,052		(45,131		)	—			2,739,753
Total equity securities	2,208,834		1,917,323		(51,682		)	—			4,074,475
Short-term investments	1,642,103		167		(9		)	—			1,642,261
Investments, available-for-sale	$	12,889,095	$	2,318,005	$	(92,014	)	$	(3,882	)	$	15,111,204

Summary Of Gross Unrealized Investment Losses By Length Of Time That Securities Have Continuously Been In An Unrealized Loss Position

	December 31, 2015
	Less than 12 months					12 months or longer					Total
(dollars in thousands)	Estimated Fair Value		Gross  Unrealized Holding and  Other-Than- Temporary Impairment Losses			Estimated Fair Value		Gross  Unrealized Holding and  Other-Than- Temporary Impairment Losses			Estimated Fair Value		Gross  Unrealized Holding and  Other-Than- Temporary Impairment Losses
Fixed maturity securities:
U.S. Treasury	$	301,300	$	(962	)	$	7,426	$	(86	)	$	308,726	$	(1,048	)
U.S. government-sponsored enterprises	125,703		(2,686		)	85,126		(1,047		)	210,829		(3,733		)
Obligations of states, municipalities and political subdivisions	169,362		(4,864		)	70,101		(3,361		)	239,463		(8,225		)
Foreign governments	51,328		(249		)	40,345		(1,432		)	91,673		(1,681		)
Commercial mortgage-backed	289,058		(3,600		)	95,843		(1,399		)	384,901		(4,999		)
Residential mortgage-backed	78,814		(2,858		)	137,100		(3,422		)	215,914		(6,280		)
Asset-backed	6,228		(54		)	24,315		(352		)	30,543		(406		)
Corporate	470,694		(9,509		)	343,737		(8,324		)	814,431		(17,833		)
Total fixed maturity securities	1,492,487		(24,782		)	803,993		(19,423		)	2,296,480		(44,205		)
Equity securities:
Insurance, banks and other financial institutions	63,873		(6,384		)	6,247		(167		)	70,120		(6,551		)
Industrial, consumer and all other	344,857		(44,879		)	2,907		(252		)	347,764		(45,131		)
Total equity securities	408,730		(51,263		)	9,154		(419		)	417,884		(51,682		)
Short-term investments	129,473		(9		)	—		—			129,473		(9		)
Total	$	2,030,690	$	(76,054	)	$	813,147	$	(19,842	)	$	2,843,837	$	(95,896	)

The following tables summarize gross unrealized investment losses by the length of time that securities have continuously been in an unrealized loss position.

	December 31, 2016
	Less than 12 months					12 months or longer					Total
(dollars in thousands)	Estimated Fair Value		Gross  Unrealized Holding and  Other-Than- Temporary Impairment Losses			Estimated Fair Value		Gross  Unrealized Holding and  Other-Than- Temporary Impairment Losses			Estimated Fair Value		Gross  Unrealized Holding and  Other-Than- Temporary Impairment Losses
Fixed maturity securities:
U.S. Treasury	$	122,950	$	(894	)	$	—	$	—		$	122,950	$	(894	)
U.S. government-sponsored enterprises	220,333		(4,324		)	7,618		(4		)	227,951		(4,328		)
Obligations of states, municipalities and political subdivisions	1,004,947		(37,685		)	31,723		(4,120		)	1,036,670		(41,805		)
Foreign governments	68,887		(2,145		)	5,005		(8		)	73,892		(2,153		)
Commercial mortgage-backed	749,889		(19,091		)	29,988		(453		)	779,877		(19,544		)
Residential mortgage-backed	181,557		(4,987		)	79,936		(2,319		)	261,493		(7,306		)
Asset-backed	14,501		(106		)	5,869		(52		)	20,370		(158		)
Corporate	494,573		(8,357		)	93,790		(1,680		)	588,363		(10,037		)
Total fixed maturity securities	2,857,637		(77,589		)	253,929		(8,636		)	3,111,566		(86,225		)
Equity securities:
Insurance, banks and other financial institutions	8,808		(410		)	37,973		(5,186		)	46,781		(5,596		)
Industrial, consumer and all other	98,406		(4,772		)	29,650		(3,382		)	128,056		(8,154		)
Total equity securities	107,214		(5,182		)	67,623		(8,568		)	174,837		(13,750		)
Short-term investments	504,211		(6		)	—		—			504,211		(6		)
Total	$	3,469,062	$	(82,777	)	$	321,552	$	(17,204	)	$	3,790,614	$	(99,981	)

Schedule Of Amortized Cost And Estimated Fair Value Of Fixed Maturity Securities By Contractual Maturity

The amortized cost and estimated fair value of fixed maturity securities at December 31, 2016 are shown below by contractual maturity.

(dollars in thousands)	Amortized Cost		Estimated Fair Value
Due in one year or less	$	798,529	$	800,733
Due after one year through five years	1,210,130		1,252,152
Due after five years through ten years	1,582,373		1,659,755
Due after ten years	4,137,758		4,320,230
	7,728,790		8,032,870
Commercial mortgage-backed	1,055,947		1,040,356
Residential mortgage-backed	779,503		790,946
Asset-backed	27,494		27,338
Total fixed maturity securities	$	9,591,734	$	9,891,510

Components Of Net Investment Income

The following table presents the components of net investment income.

	Years Ended December 31,
(dollars in thousands)	2016			2015			2014
Interest:
Municipal bonds (tax-exempt)	$	88,654		$	93,580		$	98,262
Municipal bonds (taxable)	65,749			57,550			49,345
Other taxable bonds	144,752			138,763			152,789
Short-term investments, including overnight deposits	11,177			5,223			5,959
Dividends on equity securities	70,577			74,705			65,031
Income (loss) from equity method investments	6,852			(262		)	4,766
Other	2,676			651			2,338
	390,437			370,210			378,490
Investment expenses	(17,207		)	(16,997		)	(15,260		)
Net investment income	$	373,230		$	353,213		$	363,230

Summary Of Net Realized Investment Gains And The Change In Net Unrealized Gains On Investments

The following table presents net realized investment gains and the change in net unrealized gains on investments.

	Years Ended December 31,
(dollars in thousands)	2016			2015			2014
Realized gains:
Sales of fixed maturity securities	$	5,160		$	3,073		$	8,417
Sales of equity securities	70,177			156,987			51,356
Other	1,415			8,103			15,205
Total realized gains	76,752			168,163			74,978
Realized losses:
Sales of fixed maturity securities	(704		)	(4,598		)	(18,136		)
Sales of equity securities	(6,988		)	(1,232		)	(802		)
Other-than-temporary impairments	(18,355		)	(44,481		)	(4,784		)
Other	(2,349		)	(486		)	(15,700		)
Total realized losses	(28,396		)	(50,797		)	(39,422		)
Gains (losses) on securities measured at fair value through net income	16,791			(10,886		)	10,444
Net realized investment gains	$	65,147		$	106,480		$	46,000
Change in net unrealized gains on investments included in other comprehensive income (loss):
Fixed maturity securities	$	(56,534	)	$	(137,435	)	$	480,350
Equity securities	398,752			(320,277		)	500,673
Short-term investments	(107		)	128			12
Net increase (decrease)	$	342,111		$	(457,584	)	$	981,035

Summary of Other-Than-Temporary Impairment Losses Recognized In Net Income And In Net Realized Investment Gains By Investment Type

The following table presents other-than-temporary impairment losses recognized in net income and included in net realized investment gains by investment type.

	Years Ended December 31,
(dollars in thousands)	2016			2015			2014
Fixed maturity securities:
Commercial mortgage-backed	$	—		$	—		$	(61	)
Asset-backed	—			—			(197		)
Corporate	—			—			(46		)
Total fixed maturity securities	—			—			(304		)
Equity securities:
Insurance, banks and other financial institutions	(7,586		)	(9,835		)	(341		)
Industrial, consumer and all other	(10,769		)	(34,646		)	(4,139		)
Total equity securities	(18,355		)	(44,481		)	(4,480		)
Total	$	(18,355	)	$	(44,481	)	$	(4,784	)

Components Of Restricted Assets

The following table presents the components of restricted assets.

	December 31,
(dollars in thousands)	2016		2015
Restricted assets held in trust or on deposit to support underwriting activities	$	4,059,336	$	4,037,458
Investments and cash and cash equivalents pledged as security for letters of credit	355,616		745,744
Total	$	4,414,952	$	4,783,202

Schedule Of Restricted Assets

Total restricted assets are included on the Company's consolidated balance sheets as follows.

	December 31,
(dollars in thousands)	2016		2015
Investments, available-for-sale	$	4,068,535	$	4,343,070
Restricted cash and cash equivalents	346,417		440,132
Total	$	4,414,952	$	4,783,202

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Receivables (Tables)

12 Months Ended

Dec. 31, 2016

Receivables [Abstract]

Components Of Receivables

The following table presents the components of receivables.

	December 31,
(dollars in thousands)	2016			2015
Amounts receivable from agents, brokers and insureds	$	1,061,190		$	983,510
Trade accounts receivable	123,341			119,558
Investment management and performance fees receivable	38,735			—
Employee stock loans receivable (see note 12(c))	20,171			16,900
Other	10,122			6,165
	1,253,559			1,126,133
Allowance for doubtful receivables	(11,910		)	(12,430		)
Receivables	$	1,241,649		$	1,113,703

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Deferred Policy Acquisition Costs (Tables)

12 Months Ended

Dec. 31, 2016

Deferred Policy Acquisition Costs Disclosures [Abstract]

Amounts Of Policy Acquisition Costs Acquired, Deferred And Amortized

The following table presents the amounts of policy acquisition costs deferred and amortized.

	Years Ended December 31,
(dollars in thousands)	2016			2015			2014
Balance, beginning of year	$	352,756		$	353,410		$	260,967
Policy acquisition costs deferred	823,840			752,324			754,303
Amortization of policy acquisition costs	(782,221		)	(744,964		)	(654,916		)
Foreign currency movements	(1,965		)	(8,014		)	(6,944		)
Deferred policy acquisition costs	$	392,410		$	352,756		$	353,410

Components Of Underwriting, Acquisition And Insurance Expenses

The following table presents the components of underwriting, acquisition and insurance expenses.

	Years Ended December 31,
(dollars in thousands)	2016		2015		2014
Amortization of policy acquisition costs	$	782,221	$	744,964	$	654,916
Other operating expenses	716,369		710,116		805,966
Underwriting, acquisition and insurance expenses	$	1,498,590	$	1,455,080	$	1,460,882

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Property And Equipment (Tables)

12 Months Ended

Dec. 31, 2016

Property, Plant and Equipment [Abstract]

Components Of Property And Equipment

The following table presents the components of property and equipment, which are included in other assets on the consolidated balance sheets.

	December 31,
(dollars in thousands)	2016			2015
Land	$	56,783		$	56,408
Buildings	76,159			77,488
Leasehold improvements	95,898			104,003
Land improvements	74,040			71,585
Furniture and equipment	301,146			291,736
Other	162,385			134,939
	766,411			736,159
Accumulated depreciation and amortization	(354,009		)	(305,324		)
Property and equipment	$	412,402		$	430,835

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Goodwill And Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

Components Of Goodwill

The following table presents the components of goodwill by reportable segment.

(dollars in thousands)	U.S. Insurance		International Insurance			Reinsurance		Other(1)			Total
January 1, 2015	$	280,579	$	408,183		$	122,745	$	237,608		$	1,049,115
Acquisitions (see note 2)	—		—			—		146,659			146,659
Impairment loss	—		—			—		(14,880		)	(14,880		)
Foreign currency movements and other adjustments	—		(10,190		)	—		(2,860		)	(13,050		)
December 31, 2015 (2)	$	280,579	$	397,993		$	122,745	$	366,527		$	1,167,844
Impairment loss	—		—			—		(18,723		)	(18,723		)
Foreign currency movements and other adjustments	—		(5,809		)	—		(1,064		)	(6,873		)
December 31, 2016 (2)	$	280,579	$	392,184		$	122,745	$	346,740		$	1,142,248

⁽¹⁾  Amounts included in Other above are related to the Company's non-insurance operations, which are not included in a reportable segment.

⁽²⁾  Goodwill is net of accumulated impairment losses of $47.3 million and $28.6 million, as of December 31, 2016 and 2015, respectively, included in Other.

Components Of Intangible Assets

The following table presents the components of intangible assets with a net carrying amount.

	December 31,
	2016					2015
(dollars in thousands)	Gross Carrying Amount		Accumulated Amortization			Gross Carrying Amount		Accumulated Amortization
Customer relationships	$	460,327	$	(119,376	)	$	481,547	$	(97,892	)
Broker relationships	183,092		(56,888		)	182,626		(45,135		)
Trade names	100,966		(29,745		)	103,681		(23,821		)
Investment management agreements	98,000		(7,000		)	98,000		—
Technology	54,408		(28,220		)	54,241		(22,288		)
Insurance licenses	30,185		—			30,185		—
Lloyd's syndicate capacity	12,000		—			12,000		—
Other	34,172		(9,379		)	30,496		(11,268		)
Total	$	973,150	$	(250,608	)	$	992,776	$	(200,404	)

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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2016

Income Tax Disclosure [Abstract]

Components Of Income Before Income Taxes

Income before income taxes includes the following components.

	Years Ended December 31,
(dollars in thousands)	2016		2015		2014
Domestic operations	$	288,905	$	323,954	$	240,279
Foreign operations	341,015		418,151		200,099
Income before income taxes	$	629,920	$	742,105	$	440,378

Components Of Income Tax Expense

Income tax expense includes the following components.

	Years Ended December 31,
(dollars in thousands)	2016		2015			2014
Current:
Domestic	$	57,916	$	44,406		$	7,573
Foreign	48,203		118,235			24,574
Total current tax expense	106,119		162,641			32,147
Deferred:
Domestic	19,991		9,415			43,673
Foreign	43,367		(19,093		)	40,870
Total deferred tax expense (benefit)	63,358		(9,678		)	84,543
Income tax expense	$	169,477	$	152,963		$	116,690

Reconciliations Of United States Corporate Income Tax Rate To Effective Tax Rate On Income Before Income Taxes

Reconciliations of the United States corporate income tax rate to the effective tax rate on income before income taxes are presented in the following table.

	Years Ended December 31,
	2016		2015		2014
United States corporate tax rate	35	%	35	%	35	%
Tax-exempt investment income	(6	)	(5	)	(9	)
Foreign tax credits	(2	)	(8	)	(1	)
Foreign operations	1		(1	)	—
Other	(1	)	—		1
Effective tax rate	27	%	21	%	26	%

Components Of Domestic And Foreign Deferred Tax Assets And Liabilities

The following table presents the components of domestic and foreign deferred tax assets and liabilities.

	December 31,
(dollars in thousands)	2016			2015
Assets:
Unpaid losses and loss adjustment expenses	$	181,303		$	212,012
Life and annuity benefits	135,075			156,950
Unearned premiums recognized for income tax purposes	121,852			102,076
Accrued incentive compensation	67,719			53,586
Investments, including other-than-temporary impairments	58,248			65,641
Net operating loss carryforwards	26,743			18,771
Tax credit carryforwards	23,037			18,158
Stock-based compensation	19,235			21,948
Other differences between financial reporting and tax bases	44,942			40,497
Total gross deferred tax assets	678,154			689,639
Less valuation allowance	(18,781		)	(5,131		)
Total gross deferred tax assets, net of allowance	659,373			684,508
Liabilities:
Net unrealized gains on investments	723,198			626,776
Deferred policy acquisition costs	128,302			88,036
Amortization of goodwill and other intangible assets	102,631			107,271
Other differences between financial reporting and tax bases	35,727			38,613
Total gross deferred tax liabilities	989,858			860,696
Net deferred tax liability	$	330,485		$	176,188

Reconciliation Of Beginning And Ending Unrecognized Tax Benefits

The following table presents a reconciliation of unrecognized tax benefits.

	Years Ended December 31,
(dollars in thousands)	2016			2015
Unrecognized tax benefits, beginning of year	$	15,324		$	17,700
Decreases for tax positions taken in prior years	—			(146		)
Lapse of statute of limitations	(6,448		)	(606		)
Settlement with taxing authorities	—			(1,624		)
Unrecognized tax benefits, end of year	$	8,876		$	15,324

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Unpaid Losses And Loss Adjustment Expenses (Tables)

12 Months Ended

Dec. 31, 2016

Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]

Reconciliation Of Consolidated Reserves For Losses And Loss Adjustment Expenses

The following table presents a reconciliation of consolidated beginning and ending reserves for losses and loss adjustment expenses. In 2016, incurred losses and loss adjustment expenses in the following table exclude $11.7 million of favorable development on prior years loss reserves included in losses and loss adjustment expenses on the consolidated statement of income and other comprehensive income (loss) related to the commutation of a property and casualty deposit contract, for which the underlying deposit liability was included in other liabilities on the consolidated balance sheet as of December 31, 2015, rather than unpaid losses and loss adjustment expenses.

	Years Ended December 31,
(dollars in thousands)	2016			2015			2014
Net reserves for losses and loss adjustment expenses, beginning of year	$	8,235,288		$	8,535,483		$	8,407,642
Foreign currency movements	(129,692		)	(134,173		)	(137,385		)
Adjusted net reserves for losses and loss adjustment expenses, beginning of year	8,105,596			8,401,310			8,270,257
Incurred losses and loss adjustment expenses:
Current year	2,555,902			2,566,545			2,638,012
Prior years	(493,495		)	(627,800		)	(435,545		)
Total incurred losses and loss adjustment expenses	2,062,407			1,938,745			2,202,467
Payments:
Current year	532,140			486,551			502,107
Prior years	1,529,206			1,423,286			1,436,851
Total payments	2,061,346			1,909,837			1,938,958
Effect of foreign currency rate changes	2,060			(17,281		)	(19,476		)
Net reserves for losses and loss adjustment expenses of acquired insurance companies	—			—			21,193
Reinsurance recoverable on retroactive reinsurance transactions	—			(177,649		)	—
Net reserves for losses and loss adjustment expenses, end of year	8,108,717			8,235,288			8,535,483
Reinsurance recoverable on unpaid losses	2,006,945			2,016,665			1,868,669
Gross reserves for losses and loss adjustment expenses, end of year	$	10,115,662		$	10,251,953		$	10,404,152

Ultimate Incurred Losses And Cumulative Paid Losses And Allocated Loss Adjustment Expenses, Net Of Reinsurance

The tables below also include claim frequency information, by accident year, for each of the segments presented. The Company defines a claim as a single claim incident, per policy, which may include multiple claimants and multiple coverages on a single policy. Claim counts include claims closed without a payment as well as claims where the Company is monitoring to determine if an exposure exists, even if a reserve has not been established.

In 2013, the Company completed the acquisition of Alterra, the results of which are included in each of the Company's reportable segments. Ultimate incurred losses and loss adjustment expenses, net of reinsurance for the year ended December 31, 2013 include outstanding liabilities for losses and loss adjustment expenses of Alterra as of the acquisition date, by accident year and not in any prior periods. Pre-acquisition data is not available by segment and accident year as a result of changes to the historical Alterra product line reporting structure that impacted each of the Company's reportable segments and the impact of significant intercompany reinsurance contracts. Additionally, Alterra reserves were historically determined on a policy year basis and pre-acquisition data does not exist in a format that can be used to determine accident year and segment. Following the acquisition, ongoing business attributable to Alterra was integrated with the Company's other insurance operations and is not separately tracked.

U.S. Insurance Segment

	Ultimate Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance										Total of Incurred-but-Not-Reported Liabilities, Net of Reinsurance		Cumulative Number of Reported Claims
	Unaudited								Year Ended December 31,
(in thousands)	Years Ended December 31,
Accident Year	2012		2013		2014		2015		2016		December 31, 2016
2012	$	949,141	$	985,721	$	924,138	$	924,621	$	909,237	$	117,333	106
2013			1,130,681		1,105,927		1,042,100		1,009,438		175,309		65
2014					1,278,116		1,140,685		1,116,093		290,827		56
2015							1,285,411		1,211,389		500,705		55
2016									1,319,731		781,984		49
Total									$	5,565,888
	Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance
	Unaudited								Year Ended December 31,
	Years Ended December 31,
Accident Year	2012		2013		2014		2015		2016
2012	$	193,708	$	401,773	$	546,635	$	644,658	$	728,802
2013			222,890		443,392		594,558		725,782
2014					264,697		487,068		650,118
2015							260,121		514,497
2016									278,650
Total									$	2,897,849
All outstanding liabilities for unpaid losses and loss adjustment expenses before 2012, net of reinsurance									402,534
Total liabilities for unpaid losses and loss adjustment expenses, net of reinsurance									$	3,070,573

Reinsurance Segment

	Ultimate Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance										Total of Incurred-but-Not-Reported Liabilities, Net of Reinsurance
	Unaudited								Year Ended December 31,
(in thousands)	Years Ended December 31,
Accident Year	2012		2013		2014		2015		2016		December 31, 2016
2012	$	72,250	$	545,939	$	503,410	$	482,836	$	455,103	$	137,778
2013			581,963		574,760		545,743		531,955		179,519
2014					575,479		565,252		536,274		209,246
2015							526,286		511,959		306,717
2016									529,518		382,407
Total									$	2,564,809
	Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance
	Unaudited								Year Ended December 31,
	Years Ended December 31,
Accident Year	2012		2013		2014		2015		2016
2012	$	3,955	$	64,209	$	128,174	$	183,321	$	230,742
2013			71,182		154,494		209,256		268,052
2014					97,617		158,104		228,293
2015							63,963		134,530
2016									79,481
Total									$	941,098
All outstanding liabilities for unpaid losses and loss adjustment expenses before 2012, net of reinsurance									840,563
Total liabilities for unpaid losses and loss adjustment expenses, net of reinsurance									$	2,464,274

International Insurance Segment

	Ultimate Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance										Total of Incurred-but-Not-Reported Liabilities, Net of Reinsurance		Cumulative Number of Reported Claims
	Unaudited								Year Ended December 31,
(in thousands)	Years Ended December 31,
Accident Year	2012		2013		2014		2015		2016		December 31, 2016
2012	$	412,684	$	616,641	$	557,604	$	495,641	$	479,558	$	87,383	18
2013			597,145		581,164		476,433		446,568		155,062		17
2014					577,454		545,954		502,708		149,455		16
2015							488,649		489,119		222,864		16
2016									543,959		279,320		13
Total									$	2,461,912
	Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance
	Unaudited								Year Ended December 31,
	Years Ended December 31,
Accident Year	2012		2013		2014		2015		2016
2012	$	38,992	$	163,805	$	230,882	$	289,517	$	319,843
2013			47,887		126,699		182,173		220,625
2014					65,683		167,568		240,050
2015							61,556		148,037
2016									92,665
Total									$	1,021,220
All outstanding liabilities for unpaid losses and loss adjustment expenses before 2012, net of reinsurance									570,940
Total liabilities for unpaid losses and loss adjustment expenses, net of reinsurance									$	2,011,632

Average Annual Percentage Payout Of Incurred Losses By Age (in Years), Net Of Reinsurance

The following table presents supplementary information about average historical claims duration as of December 31, 2016 based on the cumulative incurred and paid losses and allocated loss adjustment expenses presented above.

	Average Annual Percentage Payout of Incurred Losses by Age (in Years), Net of Reinsurance
Unaudited	1		2		3		4		5
U.S. Insurance	21.9	%	21.4	%	15.2	%	11.9	%	9.3	%
International Insurance	12.3	%	20.4	%	13.6	%	10.4	%	6.3	%
Reinsurance	12.0	%	13.5	%	12.5	%	11.6	%	10.4	%

Reconciliation Of Net Incurred And Paid Loss Development Tables, By Segment, To The Liability For Losses And Loss Adjustment Expenses In The Consolidated Balance Sheet

The following table reconciles the net incurred and paid loss development tables, by segment, to the liability for losses and loss adjustment expenses in the consolidated balance sheet.

(dollars in thousands)	December 31, 2016
Net outstanding liabilities
U.S. Insurance	$	3,070,573
International Insurance	2,011,632
Reinsurance	2,464,274
Other Insurance (Discontinued Lines)	281,562
Liabilities for unpaid losses and loss adjustment expenses, net of reinsurance	7,828,041
Reinsurance recoverable on unpaid losses
U.S. Insurance	631,608
International Insurance	982,127
Reinsurance	140,629
Other Insurance (Discontinued Lines)	252,581
Total reinsurance recoverable on unpaid losses	2,006,945
Unallocated loss adjustment expenses	211,777
Unamortized fair value adjustments on acquired reserves for losses and loss adjustment expenses	68,899
	280,676
Total gross liability for unpaid losses and loss adjustment expenses	$	10,115,662

Reconciliation Of Asbestos And Environmental Reserves For Losses And Loss Adjustment Expenses

The following table provides a reconciliation of beginning and ending A&E reserves for losses and loss adjustment expenses, which are a component of consolidated unpaid losses and loss adjustment expenses. Amounts included in the following table are presented before consideration of reinsurance allowances.

	Years Ended December 31,
(dollars in thousands)	2016			2015			2014
Net reserves for A&E losses and loss adjustment expenses, beginning of year	$	132,869		$	287,723		$	272,194
Incurred losses and loss adjustment expenses	(5,277		)	25,415			32,840
Payments	(15,988		)	(20,628		)	(17,311		)
Reinsurance recoverable on retroactive reinsurance transactions	—			(159,641		)	—
Net reserves for A&E losses and loss adjustment expenses, end of year	111,604			132,869			287,723
Reinsurance recoverable on unpaid losses	212,300			253,756			102,719
Gross reserves for A&E losses and loss adjustment expenses, end of year	$	323,904		$	386,625		$	390,442

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Life And Annuity Benefits (Tables)

12 Months Ended

Dec. 31, 2016

Liability for Future Policy Benefits [Abstract]

Schedule Of Life And Annuity Benefits

The following table presents life and annuity benefits.

	December 31,
(dollars in thousands)	2016		2015
Life	$	131,768	$	142,068
Annuities	849,226		901,218
Accident and health	68,660		79,989
Total	$	1,049,654	$	1,123,275

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Senior Long-Term Debt And Other Debt (Tables)

12 Months Ended

Dec. 31, 2016

Debt Disclosure [Abstract]

Summary Of Senior Long-Term Debt And Other Debt

The following table summarizes the Company's senior long-term debt and other debt.

	December 31,
(dollars in thousands)	2016		2015
7.20% unsecured senior notes, due April 14, 2017, interest payable semi-annually, net of unamortized premium of $417 in 2016 and $1,808 in 2015	$	91,046	$	92,436
7.125% unsecured senior notes, due September 30, 2019, interest payable semi-annually, net of unamortized discount of $522 in 2016 and $1,060 in 2015	234,183		346,725
6.25% unsecured senior notes, due September 30, 2020, interest payable semi-annually, net of unamortized premium of $35,717 in 2016 and $44,519 in 2015	385,714		394,464
5.35% unsecured senior notes, due June 1, 2021, interest payable semi-annually, net of unamortized discount of $912 in 2016 and $1,119 in 2015	248,957		248,694
4.90% unsecured senior notes, due July 1, 2022, interest payable semi-annually, net of unamortized discount of $1,536 in 2016 and $1,815 in 2015	348,215		347,891
3.625% unsecured senior notes, due March 30, 2023, interest payable semi-annually, net of unamortized discount of $1,257 in 2016 and $1,458 in 2015	248,508		248,277
7.35% unsecured senior notes, due August 15, 2034, interest payable semi-annually, net of unamortized discount of $1,212 in 2016 and $1,972 in 2015	128,570		197,923
5.0% unsecured senior notes, due March 30, 2043, interest payable semi-annually, net of unamortized discount of $5,879 in 2016 and $6,103 in 2015	243,796		243,559
5.0% unsecured senior notes, due April 5, 2046, interest payable semi-annually, net of unamortized discount of $7,154 in 2016	491,943		—
Other debt, at various interest rates ranging from 1.7% to 6.5%	153,597		119,302
Senior long-term debt and other debt	$	2,574,529	$	2,239,271

Summary Of Future Principal Payments Due At Maturity On Senior Long-Term Debt And Other Debt

The following table summarizes the future principal payments due at maturity on senior long-term debt and other debt as of December 31, 2016.

Years Ending December 31,	(dollars in thousands)
2017	$	183,916
2018	6,365
2019	239,633
2020	359,332
2021	284,758
2022 and thereafter	1,485,404
Total principal payments	$	2,559,408
Net unamortized premium	17,662
Net unamortized debt issuance costs	(2,541		)
Senior long-term debt and other debt	$	2,574,529

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Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2016

Stockholders' Equity Note [Abstract]

Schedule Of Net Income Per Share

Net income per share was determined by dividing adjusted net income to shareholders by the applicable weighted average shares outstanding. Basic shares outstanding include restricted stock units that are no longer subject to any contingencies for issuance, but for which the corresponding shares have not been issued. Diluted net income per share is computed by dividing adjusted net income to shareholders by the weighted average number of common shares and dilutive potential common shares outstanding during the year. Average closing common stock market prices are used to calculate the dilutive effect attributable to restricted stock.

	Years Ended December 31,
(in thousands, except per share amounts)	2016			2015		2014
Net income to shareholders	$	455,689		$	582,772	$	321,182
Adjustment of redeemable noncontrolling interests	(15,472		)	4,144		(8,186		)
Adjusted net income to shareholders	$	440,217		$	586,916	$	312,996
Basic common shares outstanding	14,013			13,978		13,984
Dilutive potential common shares from conversion of options	4			9		11
Dilutive potential common shares from conversion of restricted stock	61			74		62
Diluted shares outstanding	14,078			14,061		14,057
Basic net income per share	$	31.41		$	41.99	$	22.38
Diluted net income per share	$	31.27		$	41.74	$	22.27

Summary Of Nonvested Share-Based Awards

The following table summarizes nonvested share-based awards.

	Number of Awards		Weighted Average Grant-Date Fair Value
Nonvested awards at January 1, 2016	103,883		$	556.66
Granted	15,614		878.03
Vested	(53,798	)	554.62
Forfeited	(81	)	632.82
Nonvested awards at December 31, 2016	65,618		$	634.71

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Other Comprehensive Income (Loss) (Tables)

12 Months Ended

Dec. 31, 2016

Other Comprehensive Income (Loss), Tax [Abstract]

Change In Accumulated Other Comprehensive Income By Component, Net Of Taxes And Noncontrolling Interests

The following table presents the change in accumulated other comprehensive income by component, net of taxes and noncontrolling interests.

(dollars in thousands)	Unrealized Holding Gains on Available-for- Sale Securities			Foreign Currency			Net Actuarial Pension Loss			Total
December 31, 2013	$	1,131,507		$	(11,246	)	$	(30,456	)	$	1,089,805
Other comprehensive income (loss) before reclassifications	687,908			(32,245		)	(16,516		)	639,147
Amounts reclassified from accumulated other comprehensive income	(26,161		)	—			1,766			(24,395		)
Total other comprehensive income (loss)	661,747			(32,245		)	(14,750		)	614,752
December 31, 2014	$	1,793,254		$	(43,491	)	$	(45,206	)	$	1,704,557
Other comprehensive loss before reclassifications	(240,010		)	(29,205		)	(2,482		)	(271,697		)
Amounts reclassified from accumulated other comprehensive income	(80,482		)	—			2,130			(78,352		)
Total other comprehensive loss	(320,492		)	(29,205		)	(352		)	(350,049		)
December 31, 2015	$	1,472,762		$	(72,696	)	$	(45,558	)	$	1,354,508
Other comprehensive income (loss) before reclassifications	275,696			(11,710		)	(20,700		)	243,286
Amounts reclassified from accumulated other comprehensive income	(33,528		)	—			1,600			(31,928		)
Total other comprehensive income (loss)	242,168			(11,710		)	(19,100		)	211,358
December 31, 2016	$	1,714,930		$	(84,406	)	$	(64,658	)	$	1,565,866

Summary Of Tax Expense (Benefit) Of Other Comprehensive Income (Loss)

The following table summarizes the tax expense (benefit) associated with each component of other comprehensive income (loss).

	Years Ended December 31,
(dollars in thousands)	2016			2015			2014
Change in net unrealized gains on investments:
Net holding gains (losses) arising during the period	$	112,399		$	(107,860	)	$	328,564
Change in unrealized other-than-temporary impairment losses on fixed maturities arising during the period	6			35			614
Reclassification adjustments for net gains included in net income	(12,462		)	(29,267		)	(9,890		)
Change in net unrealized gains on investments	99,943			(137,092		)	319,288
Change in foreign currency translation adjustments	1,037			408			1,918
Change in net actuarial pension loss	(4,192		)	(88		)	(3,687		)
Total	$	96,788		$	(136,772	)	$	317,519

Reclassifications From Accumulated Other Comprehensive Income Into Income, By Component

The following table presents the details of amounts reclassified from accumulated other comprehensive income into income, by component.

	Years Ended December 31,
(dollars in thousands)	2016			2015			2014
Unrealized holding gains on available-for-sale securities:
Other-than-temporary impairment losses	$	(18,355	)	$	(44,481	)	$	(4,784	)
Net realized investment gains, excluding other-than-temporary impairment losses	64,345			154,230			40,835
Total before taxes	45,990			109,749			36,051
Income taxes	(12,462		)	(29,267		)	(9,890		)
Reclassification of unrealized holding gains, net of taxes	$	33,528		$	80,482		$	26,161
Net actuarial pension loss:
Underwriting, acquisition and insurance expenses	$	(1,951	)	$	(2,662	)	$	(2,084	)
Income taxes	351			532			318
Reclassification of net actuarial pension loss, net of taxes	$	(1,600	)	$	(2,130	)	$	(1,766	)

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Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2016

Fair Value Disclosures [Abstract]

Balances Of Assets Measured At Fair Value On A Recurring Basis

The following tables present the balances of assets measured at fair value on a recurring basis by level within the fair value hierarchy.

	December 31, 2016
(dollars in thousands)	Level 1		Level 2		Level 3		Total
Assets:
Investments available-for-sale:
Fixed maturity securities:
U.S. Treasury	$	—	$	258,584	$	—	$	258,584
U.S. government-sponsored enterprises	—		423,212		—		423,212
Obligations of states, municipalities and political subdivisions	—		4,428,205		—		4,428,205
Foreign governments	—		1,463,462		—		1,463,462
Commercial mortgage-backed	—		1,040,356		—		1,040,356
Residential mortgage-backed	—		790,946		—		790,946
Asset-backed	—		27,338		—		27,338
Corporate	—		1,459,407		—		1,459,407
Total fixed maturity securities	—		9,891,510		—		9,891,510
Equity securities:
Insurance, banks and other financial institutions	1,506,607		—		191,203		1,697,810
Industrial, consumer and all other	3,048,031		—		—		3,048,031
Total equity securities	4,554,638		—		191,203		4,745,841
Short-term investments	2,255,898		80,253		—		2,336,151
Total investments available-for-sale	$	6,810,536	$	9,971,763	$	191,203	$	16,973,502

	December 31, 2015
(dollars in thousands)	Level 1		Level 2		Level 3		Total
Assets:
Investments available-for-sale:
Fixed maturity securities:
U.S. Treasury	$	—	$	309,417	$	—	$	309,417
U.S. government-sponsored enterprises	—		391,290		—		391,290
Obligations of states, municipalities and political subdivisions	—		4,013,213		—		4,013,213
Foreign governments	—		1,416,457		—		1,416,457
Commercial mortgage-backed	—		659,538		—		659,538
Residential mortgage-backed	—		854,247		—		854,247
Asset-backed	—		36,071		—		36,071
Corporate	—		1,714,235		—		1,714,235
Total fixed maturity securities	—		9,394,468		—		9,394,468
Equity securities:
Insurance, banks and other financial institutions	1,334,722		—		—		1,334,722
Industrial, consumer and all other	2,739,753		—		—		2,739,753
Total equity securities	4,074,475		—		—		4,074,475
Short-term investments	1,529,924		112,337		—		1,642,261
Total investments available-for-sale	$	5,604,399	$	9,506,805	$	—	$	15,111,204

Summary Of Changes In Level 3 Investments Measured At Fair Value On A Recurring Basis

The following table summarizes changes in Level 3 investments measured at fair value on a recurring basis.

(dollars in thousands)	2016			2015
Equity securities, beginning of period	$	—		$	—
Purchases	195,250			—
Sales	(25,000		)	—
Total gains included in:
Net income	20,953			—
Other comprehensive income (loss)	—			—
Transfers into Level 3	—			—
Transfers out of Level 3	—			—
Equity securities, end of period	$	191,203		$	—
Net unrealized gains included in net income relating to assets held at December 31, 2016 and 2015 (1)	$	20,953		$	—

⁽¹⁾Included in net realized investment gains in the consolidated statements of income and comprehensive income.

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Reinsurance (Tables)

12 Months Ended

Dec. 31, 2016

Reinsurance Disclosures [Abstract]

Reinsurance Allowance For Doubtful Accounts

The following table summarizes the Company's reinsurance allowance for doubtful accounts.

	Years Ended December 31,
(dollars in thousands)	2016			2015			2014
Reinsurance allowance, beginning of year	$	59,350		$	59,813		$	76,210
Additions	980			5,897			10,316
Deductions	(23,560		)	(6,360		)	(26,713		)
Reinsurance allowance, end of year	$	36,770		$	59,350		$	59,813

Effect Of Reinsurance And Retrocessional Reinsurance On Premiums Written And Earned

The following table summarizes the effect of reinsurance and retrocessional reinsurance on premiums written and earned.

	Years Ended December 31,
	2016						2015						2014
(dollars in thousands)	Written			Earned			Written			Earned			Written			Earned
Direct	$	3,560,635		$	3,506,687		$	3,474,510		$	3,480,297		$	3,478,273		$	3,443,912
Assumed	1,236,010			1,176,205			1,158,402			1,194,772			1,327,240			1,298,371
Ceded	(795,625		)	(817,022		)	(813,619		)	(851,537		)	(888,498		)	(901,371		)
Net premiums	$	4,001,020		$	3,865,870		$	3,819,293		$	3,823,532		$	3,917,015		$	3,840,912

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Commitments And Contingencies (Tables)

12 Months Ended

Dec. 31, 2016

Commitments and Contingencies Disclosure [Abstract]

Minimum Annual Rental Commitments

The following table summarizes the Company's minimum annual rental commitments, excluding taxes, insurance and other operating costs payable directly by the Company, for noncancelable operating leases at December 31, 2016.

Years Ending December 31,	(dollars in thousands)
2017	$	34,449
2018	31,883
2019	29,270
2020	21,536
2021	21,140
2022 and thereafter	95,979
Total	$	234,257

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Statutory Financial Information (Tables)

12 Months Ended

Dec. 31, 2016

Statutory Financial Information [Abstract]

Actual Statutory Capital And Surplus

Statutory capital and surplus and statutory net income (loss) for the Company's insurance subsidiaries as of December 31, 2016 and 2015 and for the years ended December 31, 2016, 2015 and 2014, respectively, is summarized below.

Statutory Capital and Surplus
(dollars in thousands)	2016		2015
United States	$	2,761,454	$	2,569,928
United Kingdom	$	682,477	$	603,238
Bermuda	$	2,189,649	$	1,964,844
Other	$	24,726	$	17,305

Statutory Net Income (Loss)

Statutory Net Income (Loss)
	Years Ended December 31,
(dollars in thousands)	2016			2015			2014
United States	$	249,176		$	291,783		$	212,909
United Kingdom	$	77,909		$	74,330		$	73,697
Bermuda	$	132,442		$	185,289		$	110,401
Other	$	(891	)	$	(3,181	)	$	1,367

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Segment Reporting Disclosures (Tables)

12 Months Ended

Dec. 31, 2016

Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]

Summary Of Gross Written Premiums By Country

The following table summarizes the Company's gross written premiums by country. Gross written premiums are attributed to individual countries based upon location of risk or cedent.

	Years Ended December 31,
(dollars in thousands)	2016		% of Total		2015		% of Total		2014		% of Total
United States	$	3,691,840	77	%	$	3,519,487	76	%	$	3,523,239	73	%
United Kingdom	358,348		7		414,941		9		441,669		9
Canada	125,444		3		115,191		2		125,617		3
Other countries	621,013		13		583,293		13		714,988		15
Total	$	4,796,645	100	%	$	4,632,912	100	%	$	4,805,513	100	%

Company's Segment Disclosures

The following tables summarize the Company's segment disclosures.

	Year Ended December 31, 2016
(dollars in thousands)	U.S. Insurance			International Insurance			Reinsurance			Other Insurance (Discontinued Lines)				Investing		Consolidated
Gross premium volume	$	2,635,266		$	1,119,815		$	1,041,055		$	509			$	—	$	4,796,645
Net written premiums	2,237,163			864,494			898,728			635				—		4,001,020
Earned premiums	2,175,332			853,512			836,264			762				—		3,865,870
Losses and loss adjustment expenses:
Current accident year	(1,403,589		)	(605,837		)	(546,476		)	—				—		(2,555,902		)
Prior accident years	204,881			164,713			125,514			10,050				—		505,158
Amortization of policy acquisition costs	(446,649		)	(146,117		)	(189,455		)	—				—		(782,221		)
Other operating expenses	(377,230		)	(219,066		)	(119,012		)	(1,061		)		—		(716,369		)
Underwriting profit	152,745			47,205			106,835			9,751				—		316,536
Net investment income	—			—			—			—				373,230		373,230
Net realized investment gains	—			—			—			—				65,147		65,147
Other revenues (insurance)	7,143			5,560			—			1,891				—		14,594
Other expenses (insurance)	(15,407		)	(5,712		)	—			(26,504		)		—		(47,623		)
Segment profit (loss)	$	144,481		$	47,053		$	106,835		$	(14,862	)		$	438,377	$	721,884
Other revenues (non-insurance)																1,293,185
Other expenses (non-insurance)																(1,142,620		)
Amortization of intangible assets																(68,533		)
Interest expense																(129,896		)
Loss on early extinguishment of debt																(44,100		)
Income before income taxes																$	629,920
U.S. GAAP combined ratio (1)	93		%	94		%	87		%	NM			(2)			92		%

⁽¹⁾  The U.S. GAAP combined ratio is a measure of underwriting performance and represents the relationship of incurred losses, loss adjustment expenses and underwriting, acquisition and insurance expenses to earned premiums.

⁽²⁾  NM — Ratio is not meaningful.

	Year Ended December 31, 2015
(dollars in thousands)	U.S. Insurance			International Insurance			Reinsurance			Other Insurance (Discontinued Lines)				Investing		Consolidated
Gross premium volume	$	2,504,096		$	1,164,866		$	965,374		$	(1,424	)		$	—	$	4,632,912
Net written premiums	2,106,490			888,214			824,324			265				—		3,819,293
Earned premiums	2,105,212			879,426			838,543			351				—		3,823,532
Losses and loss adjustment expenses:
Current accident year	(1,367,159		)	(638,144		)	(561,242		)	—				—		(2,566,545		)
Prior accident years	298,967			248,834			97,860			(17,861		)		—		627,800
Amortization of policy acquisition costs	(420,289		)	(142,657		)	(182,018		)	—				—		(744,964		)
Other operating expenses	(378,563		)	(221,758		)	(106,863		)	(2,932		)		—		(710,116		)
Underwriting profit (loss)	238,168			125,701			86,280			(20,442		)		—		429,707
Net investment income	—			—			—			—				353,213		353,213
Net realized investment gains	—			—			—			—				106,480		106,480
Other revenues (insurance)	3,331			7,790			593			617				—		12,331
Other expenses (insurance)	(3,902		)	(5,717		)	(1,419		)	(29,057		)		—		(40,095		)
Segment profit (loss)	$	237,597		$	127,774		$	85,454		$	(48,882	)		$	459,693	$	861,636
Other revenues (non-insurance)																1,074,427
Other expenses (non-insurance)																(1,006,710		)
Amortization of intangible assets																(68,947		)
Interest expense																(118,301		)
Income before income taxes																$	742,105
U.S. GAAP combined ratio (1)	89		%	86		%	90		%	NM			(2)			89		%

⁽¹⁾  The U.S. GAAP combined ratio is a measure of underwriting performance and represents the relationship of incurred losses, loss adjustment expenses and underwriting, acquisition and insurance expenses to earned premiums.

⁽²⁾  NM — Ratio is not meaningful.

	Year Ended December 31, 2014
(dollars in thousands)	U.S. Insurance			International Insurance			Reinsurance			Other Insurance (Discontinued Lines)				Investing		Consolidated
Gross premium volume	$	2,493,823		$	1,200,403		$	1,112,728		$	(1,441	)		$	—	$	4,805,513
Net written premiums	2,071,466			889,336			956,584			(371		)		—		3,917,015
Earned premiums	2,022,860			909,679			908,385			(12		)		—		3,840,912
Losses and loss adjustment expenses:
Current accident year	(1,340,129		)	(660,409		)	(637,474		)	—				—		(2,638,012		)
Prior accident years	216,557			166,615			79,951			(27,578		)		—		435,545
Amortization of policy acquisition costs	(403,233		)	(141,394		)	(110,289		)	—				—		(654,916		)
Other operating expenses	(396,737		)	(207,175		)	(201,673		)	(381		)		—		(805,966		)
Underwriting profit (loss)	99,318			67,316			38,900			(27,971		)		—		177,563
Net investment income	—			—			—			—				363,230		363,230
Net realized investment gains	—			—			—			—				46,000		46,000
Other revenues (insurance)	2,478			21,827			2,696			1,631				—		28,632
Other expenses (insurance)	(5,149		)	(18,706		)	(1,847		)	(37,132		)		—		(62,834		)
Segment profit (loss)	$	96,647		$	70,437		$	39,749		$	(63,472	)		$	409,230	$	552,591
Other revenues (non-insurance)																854,893
Other expenses (non-insurance)																(792,037		)
Amortization of intangible assets																(57,627		)
Interest expense																(117,442		)
Income before income taxes																$	440,378
U.S. GAAP combined ratio (1)	95		%	93		%	96		%	NM			(2)			95		%

⁽¹⁾  The U.S. GAAP combined ratio is a measure of underwriting performance and represents the relationship of incurred losses, loss adjustment expenses and underwriting, acquisition and insurance expenses to earned premiums.

⁽²⁾  NM — Ratio is not meaningful.

Summary Of Deferred Policy Acquisition Costs, Unearned Premiums And Unpaid Losses And Loss Adjustment Expenses

The following table summarizes deferred policy acquisition costs, unearned premiums and unpaid losses and loss adjustment expenses by segment.

(dollars in thousands)	Deferred Policy Acquisition Costs		Unearned Premiums		Unpaid Losses and Loss Adjustment Expenses
December 31, 2016
U.S. Insurance	$	176,348	$	1,166,914	$	3,849,541
International Insurance	51,948		445,183		3,062,725
Reinsurance	164,114		651,741		2,661,209
Other Insurance (Discontinued Lines)	—		—		542,187
Total	$	392,410	$	2,263,838	$	10,115,662
December 31, 2015
U.S. Insurance	$	162,289	$	1,105,456	$	3,720,429
International Insurance	48,913		467,158		3,140,000
Reinsurance	141,554		593,491		2,750,258
Other Insurance (Discontinued Lines)	—		—		641,266
Total	$	352,756	$	2,166,105	$	10,251,953

Summary Of Segment Earned Premiums By Product

The following table summarizes segment earned premiums by major product grouping.

	Years Ended December 31,
(dollars in thousands)	2016		2015		2014
U.S. Insurance:
General liability	$	563,908	$	522,358	$	491,645
Professional liability	328,597		324,230		321,005
Property	270,026		264,232		266,019
Personal lines	364,843		325,811		299,442
Programs	263,783		277,829		244,216
Workers compensation	301,126		281,954		263,164
Other	83,049		108,798		137,369
Total U.S. Insurance	2,175,332		2,105,212		2,022,860
International Insurance:
General liability	111,291		124,198		146,178
Professional liability	272,010		268,637		285,300
Property	87,294		85,152		76,691
Marine and energy	242,070		262,307		287,263
Other	140,847		139,132		114,247
Total International Insurance	853,512		879,426		909,679
Reinsurance:
Property	288,771		265,373		270,461
Casualty	327,383		315,027		323,390
Auto	65,363		102,227		152,645
Other	154,747		155,916		161,889
Total Reinsurance	836,264		838,543		908,385
Other Insurance (Discontinued Lines)	762		351		(12		)
Total earned premiums	$	3,865,870	$	3,823,532	$	3,840,912

Reconciliation Of Segment Assets To The Company's Consolidated Balance Sheets

The following table reconciles segment assets to the Company's consolidated balance sheets.

	December 31,
(dollars in thousands)	2016		2015		2014
Segment assets:
Investing	$	19,029,584	$	18,056,947	$	18,531,150
Underwriting	5,397,696		5,385,126		5,420,624
Total segment assets	24,427,280		23,442,073		23,951,774
Non-insurance operations	1,448,019		1,497,042		1,245,986
Total assets	$	25,875,299	$	24,939,115	$	25,197,760

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Other Revenues And Other Expenses (Tables)

12 Months Ended

Dec. 31, 2016

Other Income and Expenses [Abstract]

Summary Of Other Revenues And Other Expenses By Component

The following table summarizes the components of other revenues and other expenses.

	Years Ended December 31,
	2016				2015				2014
(dollars in thousands)	Other Revenues		Other Expenses		Other Revenues		Other Expenses		Other Revenues		Other Expenses
Insurance:
Managing general agent operations	$	12,703	$	21,119	$	10,202	$	9,619	$	23,324	$	22,527
Life and annuity	1,891		26,504		617		29,057		1,631		37,132
Other	—		—		1,512		1,419		3,677		3,175
	14,594		47,623		12,331		40,095		28,632		62,834
Non-Insurance:
Markel Ventures: Manufacturing	784,745		675,620		755,802		677,054		575,353		513,668
Markel Ventures: Non-Manufacturing	429,704		396,323		291,714		301,004		262,767		261,551
Investment management	56,455		46,190		—		—		—		—
Other	22,281		24,487		26,911		28,652		16,773		16,818
	1,293,185		1,142,620		1,074,427		1,006,710		854,893		792,037
Total	$	1,307,779	$	1,190,243	$	1,086,758	$	1,046,805	$	883,525	$	854,871

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Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2016

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

Funded Status Of The Terra Nova Pension Plan

The following table summarizes the funded status of the Terra Nova Pension Plan and the amounts recognized on the accompanying consolidated balance sheets of the Company.

	Years Ended December 31,
(dollars in thousands)	2016			2015
Change in projected benefit obligation:
Projected benefit obligation at beginning of period	$	170,005		$	185,556
Interest cost	6,113			6,645
Plan settlements	—			(2,863		)
Benefits paid	(3,322		)	(3,970		)
Actuarial loss (gain)	38,485			(6,051		)
Effect of foreign currency rate changes	(32,663		)	(9,312		)
Projected benefit obligation at end of year	$	178,618		$	170,005
Change in plan assets:
Fair value of plan assets at beginning of period	$	186,727		$	201,399
Actual gain on plan assets	22,367			2,246
Employer contributions	3,577			—
Plan settlements	—			(2,766		)
Benefits paid	(3,322		)	(3,970		)
Effect of foreign currency rate changes	(33,705		)	(10,182		)
Fair value of plan assets at end of year	$	175,644		$	186,727
Funded status of the plan	$	(2,974	)	$	16,722
Net actuarial pension loss	85,110			61,818
Total	$	82,136		$	78,540

Schedule of Defined Benefit Plan Amounts Recognized in Accumulated Other Comprehensive Income

The following table presents the changes in plan assets and projected benefit obligation recognized in accumulated other comprehensive income.

	Years Ended December 31,
(dollars in thousands)	2016			2015			2014
Net actuarial loss	$	(25,243	)	$	(3,102	)	$	(20,521	)
Settlement loss recognized	—			343			—
Amortization of:
Net actuarial loss	1,951			2,319			1,589
Prior service costs	—			—			495
Tax benefit	4,192			88			3,687
Total other comprehensive loss	$	(19,100	)	$	(352	)	$	(14,750	)

Schedule Of Net Periodic Benefit Income And Weighted Average Assumptions

The following table summarizes the components of net periodic benefit income and the weighted average assumptions for the Terra Nova Pension Plan.

	Years Ended December 31,
(dollars in thousands)	2016			2015			2014
Components of net periodic benefit income:
Interest cost	$	6,113		$	6,645		$	7,572
Expected return on plan assets	(9,124		)	(11,496		)	(12,812		)
Amortization of prior service cost	—			—			495
Amortization of net actuarial pension loss	1,951			2,319			1,589
Settlement loss recognized	—			343			—
Net periodic benefit income	$	(1,060	)	$	(2,189	)	$	(3,156	)
Weighted average assumptions as of December 31:
Discount rate	2.7		%	4.0		%	3.8		%
Expected return on plan assets	4.5		%	5.4		%	6.0		%
Rate of compensation increase	3.0		%	2.9		%	2.9		%

Summary Of Fair Value Of Plan Assets

The following table summarizes the fair value of plan assets as of December 31, 2016 and 2015.

	December 31,
(dollars in thousands)	2016		2015
Plan assets:
Fixed maturity index funds	$	103,218	$	107,033
Equity security index funds	72,419		79,686
Cash and cash equivalents	7		8
Total	$	175,644	$	186,727

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Markel Corporation (Parent Company Only) Financial Information (Tables)

12 Months Ended

Dec. 31, 2016

Condensed Financial Information of Parent Company Only Disclosure [Abstract]

Schedule Of Condensed Balance Sheets

CONDENSED BALANCE SHEETS

	December 31,
	2016		2015
	(dollars in thousands)
ASSETS
Investments, available-for-sale, at estimated fair value:
Fixed maturities (amortized cost of $51,181 in 2016 and $35,475 in 2015)	$	52,234	$	36,618
Equity securities (cost of $203,708 in 2016 and $204,289 in 2015)	367,156		311,405
Short-term investments (estimated fair value approximates cost)	1,729,400		755,619
Total Investments	2,148,790		1,103,642
Cash and cash equivalents	369,641		460,271
Restricted cash and cash equivalents	1,013		670
Receivables	20,477		17,200
Investments in consolidated subsidiaries	8,107,450		7,961,315
Notes receivable from subsidiaries	60,110		212,636
Other assets	97,364		89,747
Total Assets	$	10,804,845	$	9,845,481
LIABILITIES AND SHAREHOLDERS' EQUITY
Senior long-term debt	$	1,944,171	$	1,633,068
Notes payable to subsidiaries	285,000		300,000
Income taxes payable	25,240		4,262
Net deferred tax liability	25,902		7,498
Other liabilities	63,605		66,503
Total Liabilities	2,343,918		2,011,331
Total Shareholders' Equity	8,460,927		7,834,150
Total Liabilities and Shareholders' Equity	$	10,804,845	$	9,845,481

Schedule Of Condensed Statements Of Income And Comprehensive Income

CONDENSED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME

	Years Ended December 31,
	2016			2015			2014
	(dollars in thousands)
REVENUES
Net investment income	$	9,561		$	2,565		$	5,354
Dividends on common stock of consolidated subsidiaries	349,622			187,496			217,121
Net realized investment gains:
Other-than-temporary impairment losses	(98		)	(3,455		)	(120		)
Net realized investment gains, excluding other-than-temporary impairment losses	1,166			75,000			3,873
Net realized investment gains	1,068			71,545			3,753
Total Revenues	360,251			261,606			226,228
EXPENSES
Interest expense	116,013			95,620			94,097
Loss on early extinguishment of debt	44,100			—			—
Other expenses	13,076			11,287			2,685
Total Expenses	173,189			106,907			96,782
Income Before Equity in Undistributed Earnings of Consolidated Subsidiaries and Income Taxes	187,062			154,699			129,446
Equity in undistributed earnings of consolidated subsidiaries	196,615			407,489			163,341
Income tax benefit	(72,012		)	(20,584		)	(28,395		)
Net Income to Shareholders	$	455,689		$	582,772		$	321,182
OTHER COMPREHENSIVE INCOME (LOSS) TO SHAREHOLDERS
Change in net unrealized gains on investments, net of taxes:
Net holding gains (losses) arising during the period	$	37,045		$	(41,861	)	$	32,118
Consolidated subsidiaries' net holding gains (losses) arising during the period	238,616			(198,309		)	655,617
Consolidated subsidiaries' change in unrealized other-than-temporary impairment losses on fixed maturities arising during the period	35			160			173
Reclassification adjustments for net gains included in net income to shareholders	(558		)	(45,273		)	(1,874		)
Consolidated subsidiaries' reclassification adjustments for net gains included in net income to shareholders	(32,970		)	(35,209		)	(24,287		)
Change in net unrealized gains on investments, net of taxes	242,168			(320,492		)	661,747
Change in foreign currency translation adjustments, net of taxes	(1,326		)	2,970			1,949
Consolidated subsidiaries' change in foreign currency translation adjustments, net of taxes	(10,384		)	(32,175		)	(34,194		)
Consolidated subsidiaries' change in net actuarial pension loss, net of taxes	(19,100		)	(352		)	(14,750		)
Total Other Comprehensive Income (Loss) to Shareholders	211,358			(350,049		)	614,752
Comprehensive Income to Shareholders	$	667,047		$	232,723		$	935,934

Schedule Of Condensed Statements Of Cash Flows

CONDENSED STATEMENTS OF CASH FLOWS

	Years Ended December 31,
	2016			2015			2014
	(dollars in thousands)
OPERATING ACTIVITIES
Net income to shareholders	$	455,689		$	582,772		$	321,182
Adjustments to reconcile net income to shareholders to net cash provided by operating activities	(120,564		)	(464,193		)	(218,396		)
Net Cash Provided By Operating Activities	335,125			118,579			102,786
INVESTING ACTIVITIES
Proceeds from sales of fixed maturities and equity securities	1,831			100,633			9,306
Proceeds from maturities, calls and prepayments of fixed maturities	11,960			24,945			15,710
Cost of fixed maturities and equity securities purchased	(29,110		)	(55,656		)	(687		)
Net change in short-term investments	(970,364		)	9,956			(109,728		)
Securities received from subsidiaries as dividends, repayment of notes receivable and return of capital	238,975			—			89,996
Return of capital from subsidiaries	21,021			—			—
Decrease in notes receivable due from subsidiaries	92,530			—			28,506
Capital contributions to subsidiaries	—			(228,578		)	(74,788		)
Cost of equity method investments	(3,100		)	(13,164		)	—
Change in restricted cash and cash equivalents	(343		)	289			51
Additions to property and equipment	(584		)	(305		)	(342		)
Other	(3,207		)	(376		)	(2,150		)
Net Cash Used By Investing Activities	(640,391		)	(162,256		)	(44,126		)
FINANCING ACTIVITIES
Additions to senior long-term debt	493,149			—			—
Increase in notes payable to subsidiaries	—			285,000			—
Repayment and retirement of senior long-term debt	(183,343		)	(2,000		)	—
Premiums and fees related to early extinguishment of debt	(43,691		)	—			—
Repurchases of common stock	(51,142		)	(31,491		)	(26,053		)
Issuance of common stock	4,623			4,752			5,691
Other	(4,960		)	3,985			(1,948		)
Net Cash Provided (Used) By Financing Activities	214,636			260,246			(22,310		)
Increase (decrease) in cash and cash equivalents	(90,630		)	216,569			36,350
Cash and cash equivalents at beginning of year	460,271			243,702			207,352
CASH AND CASH EQUIVALENTS AT END OF YEAR	$	369,641		$	460,271		$	243,702

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Quarterly Financial Information (Tables)

12 Months Ended

Dec. 31, 2016

Quarterly Financial Information Disclosure [Abstract]

Quarterly Results Of Consolidated Operations

The following table presents the unaudited quarterly results of consolidated operations for 2016, 2015 and 2014.

	Quarters Ended
(dollars in thousands, except per share amounts)	Mar. 31		June 30			Sept. 30			Dec. 31
2016
Operating revenues	$	1,376,182	$	1,375,937		$	1,431,282		$	1,428,625
Net income	163,646		80,673			83,421			132,703
Net income to shareholders	160,370		78,797			83,796			132,726
Comprehensive income (loss) to shareholders	396,994		209,942			89,161			(29,050		)
Net income per share:
Basic	$	11.21	$	5.44		$	5.62		$	9.14
Diluted	11.15		5.41			5.60			9.11
Common stock price ranges:
High	$	895.03	$	989.18		$	961.78		$	931.94
Low	805.03		880.01			909.84			811.05
2015
Operating revenues	$	1,302,154	$	1,304,605		$	1,342,764		$	1,420,460
Net income	194,006		92,453			104,410			198,273
Net income to shareholders	190,992		91,369			102,519			197,892
Comprehensive income (loss) to shareholders	281,807		(132,925		)	(51,143		)	134,984
Net income per share:
Basic	$	13.57	$	6.76		$	7.43		$	14.23
Diluted	13.49		6.72			7.39			14.14
Common stock price ranges:
High	$	783.50	$	821.00		$	898.08		$	937.91
Low	660.05		736.96			775.00			791.97
2014
Operating revenues	$	1,239,655	$	1,258,971		$	1,299,286		$	1,335,755
Net income	87,501		41,141			76,824			118,222
Net income to shareholders	87,716		40,068			75,803			117,595
Comprehensive income to shareholders	230,273		250,588			36,502			418,571
Net income per share:
Basic	$	6.28	$	2.67		$	5.33		$	8.10
Diluted	6.25		2.66			5.30			8.05
Common stock price ranges:
High	$	596.87	$	655.75		$	666.00		$	707.36
Low	527.17		593.76			623.90			632.65

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Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounting Policies [Abstract]
Investments in fixed maturities recorded at estimated fair value with changes in unrealized gains and losses recorded in net income	$ 41,400
Investments in equity securities recorded at estimated fair value with changes in unrealized gains and losses recorded in net income	$ 191,200
Deferred policy acquisition cost amortization period	1 year
Adjustment of redeemable noncontrolling interests	$ (15,472)	$ 4,144	$ (8,186)
Tax benefit greater than 50%	50.00%
Insurance premiums revenue recognition period	1 year
Stock-based compensation expense, net of taxes	$ 14,300	16,300	$ 18,700
Cumulative foreign currency translation loss	$ (84,400)	$ (72,700)

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Summary of Significant Accounting Policies (Cash and Cash Equivalents) (Details)	12 Months Ended
	Dec. 31, 2016
Maximum [Member] | Cash And Cash Equivalents [Member]
Cash and Cash Equivalents [Line Items]
Investment maturity period	90 days

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Summary of Significant Accounting Policies (Goodwill and Intangible Assets) (Details)	12 Months Ended
	Dec. 31, 2016
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, estimated useful life	5 years
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, estimated useful life	20 years

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Summary of Significant Accounting Policies (Property and Equipment) (Details)	12 Months Ended
	Dec. 31, 2016
Building [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	10 years
Building [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	40 years
Land Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	7 years
Land Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	40 years
Furniture and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	3 years
Furniture and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	10 years
Other Property And Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	3 years
Other Property And Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	25 years

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Summary Of Significant Accounting Policies (Recent Accounting Pronouncements) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net unrealized gains on equity securities, net of taxes, included in accumulated other comprehensive income	$ 1,565,866	$ 1,354,508	$ 1,704,557	$ 1,089,805
Accounting Standards Update 2015-03 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt issuance costs reclassified from other assets to senior long-term debt and other debt		$ 2,200	$ 2,600
Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Insurance premium revenues and investment portfolio revenues as a percentage of consolidated revenues	77.00%
Accounting Standards Update 2016-01 [Member] | Equity Securities [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net unrealized gains on equity securities, net of taxes, included in accumulated other comprehensive income	$ 1,500,000

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Acquisitions (Narrative) (Details) - USD ($) $ in Millions		1 Months Ended		12 Months Ended
	Feb. 01, 2017	Dec. 31, 2015	Jan. 31, 2014	Dec. 31, 2016	Dec. 31, 2014	Jul. 31, 2014
Markel CATCo IM [Member]
Schedule of Asset and Business Acquisitions, by Acquisition [Line Items]
Total purchase consideration		$ 205.7
Cash consideration		205.7
Goodwill recognized		91.9
Goodwill, tax deductible		91.9
Finite-lived intangible assets		$ 113.0
Definite-lived intangible assets, weighted-average amortization period		14 years
Estimated amount of performance and retention bonus payments				$ 105.0
Compensation expense recognized for performance and retention bonuses				$ 33.2
CapTech Ventures Inc [Member]
Schedule of Asset and Business Acquisitions, by Acquisition [Line Items]
Total purchase consideration		$ 60.6
Goodwill recognized		50.6
Goodwill, tax deductible		0.0
Finite-lived intangible assets		$ 49.2
Definite-lived intangible assets, weighted-average amortization period		14 years
Percentage acquired		80.00%
Redeemable noncontrolling interest		$ 13.8
Cottrell Inc [Member]
Schedule of Asset and Business Acquisitions, by Acquisition [Line Items]
Percentage acquired						100.00%
Non-Insurance Acquisitions [Member]
Schedule of Asset and Business Acquisitions, by Acquisition [Line Items]
Total purchase consideration					$ 187.0
Goodwill recognized					38.7
Finite-lived intangible assets					78.7
Non-Insurance Acquisitions [Member] | Customer Relationships [Member]
Schedule of Asset and Business Acquisitions, by Acquisition [Line Items]
Finite-lived intangible assets					$ 53.7
Definite-lived intangible assets, weighted-average amortization period					17 years
Non-Insurance Acquisitions [Member] | Trade Names [Member]
Schedule of Asset and Business Acquisitions, by Acquisition [Line Items]
Finite-lived intangible assets					$ 13.0
Definite-lived intangible assets, weighted-average amortization period					10 years
Abbey Protection plc [Member]
Schedule of Asset and Business Acquisitions, by Acquisition [Line Items]
Total purchase consideration			$ 190.7
Cash consideration			190.7
Goodwill recognized			65.8
Goodwill, tax deductible			0.0
Finite-lived intangible assets			$ 113.4
Percentage acquired			100.00%
Abbey Protection plc [Member] | Customer Relationships [Member]
Schedule of Asset and Business Acquisitions, by Acquisition [Line Items]
Finite-lived intangible assets			$ 103.5
Definite-lived intangible assets, weighted-average amortization period			20 years
Abbey Protection plc [Member] | Trade Names [Member]
Schedule of Asset and Business Acquisitions, by Acquisition [Line Items]
Finite-lived intangible assets			$ 9.9
Definite-lived intangible assets, weighted-average amortization period			14 years
Abbey Protection plc [Member] | International Insurance [Member]
Schedule of Asset and Business Acquisitions, by Acquisition [Line Items]
Goodwill recognized			$ 43.0
Abbey Protection plc [Member] | Non-Insurance Operations [Member]
Schedule of Asset and Business Acquisitions, by Acquisition [Line Items]
Goodwill recognized			$ 22.8
SureTec Financial Corp [Member] | Subsequent Event [Member]
Schedule of Asset and Business Acquisitions, by Acquisition [Line Items]
Total purchase consideration	$ 250.0

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Investments (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) securities	Dec. 31, 2015 USD ($) securities	Dec. 31, 2014 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities in unrealized loss position, number of positions | securities	654	659
Available-for-sale securities, estimated fair value	$ 3,790,614	$ 2,843,837
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses	$ (99,981)	$ (95,896)
Number of available-for-sale securities positions in a continuous unrealized loss position for one year or longer at period end | securities	109	271
Available-for-sale securities, estimated fair value, 12 months or longer	$ 321,552	$ 813,147
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, 12 months or longer	$ (17,204)	(19,842)
Estimated average duration of the fixed maturity securities	6 years 4 months
Cumulative credit loss recognized in income	$ 10,700	$ 10,700	$ 12,700
Percentage threshold of shareholders' equity used to define concentration of investments	10.00%	10.00%
Ten largest equity holdings	$ 2,100,000
Ten largest equity holdings, percentage of equity portfolio	44.00%
Investments in property and casualty	$ 1,000,000
Investments in property and casualty, percentage of equity portfolio	22.00%
Berkshire Hathaway Inc. [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments in property and casualty	$ 511,300
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, estimated fair value	3,111,566	$ 2,296,480
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses	$ (86,225)	$ (44,205)
Number of available-for-sale securities positions in a continuous unrealized loss position for one year or longer at period end | securities	93	264
Available-for-sale securities, estimated fair value, 12 months or longer	$ 253,929	$ 803,993
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, 12 months or longer	(8,636)	(19,423)
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, estimated fair value	174,837	417,884
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses	$ (13,750)	$ (51,682)
Number of available-for-sale securities positions in a continuous unrealized loss position for one year or longer at period end | securities	16	7
Available-for-sale securities, estimated fair value, 12 months or longer	$ 67,623	$ 9,154
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, 12 months or longer	$ (8,568)	$ (419)

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Investments (Available-For-Sale Investments) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale investments, amortized cost	$ 14,409,282	$ 12,889,095
Available-for-sale investments, gross unrealized holding gains	2,664,201	2,318,005
Available-for-sale investments, gross unrealized holding losses	(97,050)	(92,014)
Available-for-sale investments, unrealized other-than-temporary impairment losses	(2,931)	(3,882)
Available-for-sale investments, estimated fair value	16,973,502	15,111,204
U.S. Treasury [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale investments, amortized cost	259,379	310,370
Available-for-sale investments, gross unrealized holding gains	99	95
Available-for-sale investments, gross unrealized holding losses	(894)	(1,048)
Available-for-sale investments, unrealized other-than-temporary impairment losses	0	0
Available-for-sale investments, estimated fair value	258,584	309,417
U.S. Government-Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale investments, amortized cost	418,457	385,282
Available-for-sale investments, gross unrealized holding gains	9,083	9,741
Available-for-sale investments, gross unrealized holding losses	(4,328)	(3,733)
Available-for-sale investments, unrealized other-than-temporary impairment losses	0	0
Available-for-sale investments, estimated fair value	423,212	391,290
Obligations Of States, Municipalities And Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale investments, amortized cost	4,324,332	3,817,136
Available-for-sale investments, gross unrealized holding gains	145,678	204,302
Available-for-sale investments, gross unrealized holding losses	(41,805)	(8,225)
Available-for-sale investments, unrealized other-than-temporary impairment losses	0	0
Available-for-sale investments, estimated fair value	4,428,205	4,013,213
Foreign Governments [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale investments, amortized cost	1,306,324	1,302,329
Available-for-sale investments, gross unrealized holding gains	159,291	115,809
Available-for-sale investments, gross unrealized holding losses	(2,153)	(1,681)
Available-for-sale investments, unrealized other-than-temporary impairment losses	0	0
Available-for-sale investments, estimated fair value	1,463,462	1,416,457
Commercial Mortgage-Backed [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale investments, amortized cost	1,055,947	657,670
Available-for-sale investments, gross unrealized holding gains	3,953	6,867
Available-for-sale investments, gross unrealized holding losses	(19,544)	(4,999)
Available-for-sale investments, unrealized other-than-temporary impairment losses	0	0
Available-for-sale investments, estimated fair value	1,040,356	659,538
Residential Mortgage-Backed [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale investments, amortized cost	779,503	837,964
Available-for-sale investments, gross unrealized holding gains	18,749	22,563
Available-for-sale investments, gross unrealized holding losses	(5,048)	(4,022)
Available-for-sale investments, unrealized other-than-temporary impairment losses	(2,258)	(2,258)
Available-for-sale investments, estimated fair value	790,946	854,247
Asset-Backed [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale investments, amortized cost	27,494	36,462
Available-for-sale investments, gross unrealized holding gains	2	15
Available-for-sale investments, gross unrealized holding losses	(158)	(406)
Available-for-sale investments, unrealized other-than-temporary impairment losses	0	0
Available-for-sale investments, estimated fair value	27,338	36,071
Corporate [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale investments, amortized cost	1,420,298	1,690,945
Available-for-sale investments, gross unrealized holding gains	49,146	41,123
Available-for-sale investments, gross unrealized holding losses	(9,364)	(16,209)
Available-for-sale investments, unrealized other-than-temporary impairment losses	(673)	(1,624)
Available-for-sale investments, estimated fair value	1,459,407	1,714,235
Total Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale investments, amortized cost	9,591,734	9,038,158
Available-for-sale investments, gross unrealized holding gains	386,001	400,515
Available-for-sale investments, gross unrealized holding losses	(83,294)	(40,323)
Available-for-sale investments, unrealized other-than-temporary impairment losses	(2,931)	(3,882)
Available-for-sale investments, estimated fair value	9,891,510	9,394,468
Insurance, Banks And Other Financial Institutions [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale investments, amortized cost	846,343	651,002
Available-for-sale investments, gross unrealized holding gains	857,063	690,271
Available-for-sale investments, gross unrealized holding losses	(5,596)	(6,551)
Available-for-sale investments, unrealized other-than-temporary impairment losses	0	0
Available-for-sale investments, estimated fair value	1,697,810	1,334,722
Industrial, Consumer And All Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale investments, amortized cost	1,635,105	1,557,832
Available-for-sale investments, gross unrealized holding gains	1,421,080	1,227,052
Available-for-sale investments, gross unrealized holding losses	(8,154)	(45,131)
Available-for-sale investments, unrealized other-than-temporary impairment losses	0	0
Available-for-sale investments, estimated fair value	3,048,031	2,739,753
Total Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale investments, amortized cost	2,481,448	2,208,834
Available-for-sale investments, gross unrealized holding gains	2,278,143	1,917,323
Available-for-sale investments, gross unrealized holding losses	(13,750)	(51,682)
Available-for-sale investments, unrealized other-than-temporary impairment losses	0	0
Available-for-sale investments, estimated fair value	4,745,841	4,074,475
Short-Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale investments, amortized cost	2,336,100	1,642,103
Available-for-sale investments, gross unrealized holding gains	57	167
Available-for-sale investments, gross unrealized holding losses	(6)	(9)
Available-for-sale investments, unrealized other-than-temporary impairment losses	0	0
Available-for-sale investments, estimated fair value	$ 2,336,151	$ 1,642,261

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Investments (Summary Of Gross Unrealized Investment Losses By Length Of Time That Securities Have Continuously Been In An Unrealized Loss Position) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, estimated fair value, less than 12 months	$ 3,469,062	$ 2,030,690
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, less than 12 months	(82,777)	(76,054)
Available-for-sale securities, estimated fair value, 12 months or longer	321,552	813,147
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, 12 months or longer	(17,204)	(19,842)
Available-for-sale securities, estimated fair value	3,790,614	2,843,837
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses	(99,981)	(95,896)
U.S. Treasury [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, estimated fair value, less than 12 months	122,950	301,300
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, less than 12 months	(894)	(962)
Available-for-sale securities, estimated fair value, 12 months or longer	0	7,426
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, 12 months or longer	0	(86)
Available-for-sale securities, estimated fair value	122,950	308,726
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses	(894)	(1,048)
U.S. Government-Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, estimated fair value, less than 12 months	220,333	125,703
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, less than 12 months	(4,324)	(2,686)
Available-for-sale securities, estimated fair value, 12 months or longer	7,618	85,126
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, 12 months or longer	(4)	(1,047)
Available-for-sale securities, estimated fair value	227,951	210,829
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses	(4,328)	(3,733)
Obligations Of States, Municipalities And Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, estimated fair value, less than 12 months	1,004,947	169,362
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, less than 12 months	(37,685)	(4,864)
Available-for-sale securities, estimated fair value, 12 months or longer	31,723	70,101
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, 12 months or longer	(4,120)	(3,361)
Available-for-sale securities, estimated fair value	1,036,670	239,463
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses	(41,805)	(8,225)
Foreign Governments [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, estimated fair value, less than 12 months	68,887	51,328
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, less than 12 months	(2,145)	(249)
Available-for-sale securities, estimated fair value, 12 months or longer	5,005	40,345
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, 12 months or longer	(8)	(1,432)
Available-for-sale securities, estimated fair value	73,892	91,673
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses	(2,153)	(1,681)
Commercial Mortgage-Backed [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, estimated fair value, less than 12 months	749,889	289,058
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, less than 12 months	(19,091)	(3,600)
Available-for-sale securities, estimated fair value, 12 months or longer	29,988	95,843
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, 12 months or longer	(453)	(1,399)
Available-for-sale securities, estimated fair value	779,877	384,901
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses	(19,544)	(4,999)
Residential Mortgage-Backed [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, estimated fair value, less than 12 months	181,557	78,814
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, less than 12 months	(4,987)	(2,858)
Available-for-sale securities, estimated fair value, 12 months or longer	79,936	137,100
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, 12 months or longer	(2,319)	(3,422)
Available-for-sale securities, estimated fair value	261,493	215,914
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses	(7,306)	(6,280)
Asset-Backed [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, estimated fair value, less than 12 months	14,501	6,228
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, less than 12 months	(106)	(54)
Available-for-sale securities, estimated fair value, 12 months or longer	5,869	24,315
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, 12 months or longer	(52)	(352)
Available-for-sale securities, estimated fair value	20,370	30,543
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses	(158)	(406)
Corporate [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, estimated fair value, less than 12 months	494,573	470,694
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, less than 12 months	(8,357)	(9,509)
Available-for-sale securities, estimated fair value, 12 months or longer	93,790	343,737
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, 12 months or longer	(1,680)	(8,324)
Available-for-sale securities, estimated fair value	588,363	814,431
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses	(10,037)	(17,833)
Total Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, estimated fair value, less than 12 months	2,857,637	1,492,487
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, less than 12 months	(77,589)	(24,782)
Available-for-sale securities, estimated fair value, 12 months or longer	253,929	803,993
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, 12 months or longer	(8,636)	(19,423)
Available-for-sale securities, estimated fair value	3,111,566	2,296,480
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses	(86,225)	(44,205)
Insurance, Banks And Other Financial Institutions [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, estimated fair value, less than 12 months	8,808	63,873
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, less than 12 months	(410)	(6,384)
Available-for-sale securities, estimated fair value, 12 months or longer	37,973	6,247
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, 12 months or longer	(5,186)	(167)
Available-for-sale securities, estimated fair value	46,781	70,120
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses	(5,596)	(6,551)
Industrial, Consumer And All Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, estimated fair value, less than 12 months	98,406	344,857
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, less than 12 months	(4,772)	(44,879)
Available-for-sale securities, estimated fair value, 12 months or longer	29,650	2,907
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, 12 months or longer	(3,382)	(252)
Available-for-sale securities, estimated fair value	128,056	347,764
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses	(8,154)	(45,131)
Total Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, estimated fair value, less than 12 months	107,214	408,730
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, less than 12 months	(5,182)	(51,263)
Available-for-sale securities, estimated fair value, 12 months or longer	67,623	9,154
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, 12 months or longer	(8,568)	(419)
Available-for-sale securities, estimated fair value	174,837	417,884
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses	(13,750)	(51,682)
Short-Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, estimated fair value, less than 12 months	504,211	129,473
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, less than 12 months	(6)	(9)
Available-for-sale securities, estimated fair value, 12 months or longer	0	0
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, 12 months or longer	0	0
Available-for-sale securities, estimated fair value	504,211	129,473
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses	$ (6)	$ (9)

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Investments (Schedule Of Amortized Cost And Estimated Fair Value Of Fixed Maturity Securities By Contractual Maturity) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Due in one year or less, amortized cost	$ 798,529
Due after one year through five years, amortized cost	1,210,130
Due after five years through ten years, amortized cost	1,582,373
Due after ten years, amortized cost	4,137,758
Amortized cost, sub-total	7,728,790
Fixed maturities, amortized cost	9,591,734	$ 9,038,158
Due in one year or less, estimated fair value	800,733
Due after one year through five years, estimated fair value	1,252,152
Due after five years through ten years, estimated fair value	1,659,755
Due after ten years, estimated fair value	4,320,230
Estimated fair value, sub-total	8,032,870
Fixed maturity securities, estimated fair value	9,891,510	$ 9,394,468
Commercial Mortgage-Backed [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	1,055,947
Estimated fair value	1,040,356
Residential Mortgage-Backed [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	779,503
Estimated fair value	790,946
Asset-Backed [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	27,494
Estimated fair value	$ 27,338

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Investments (Components Of Net Investment Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Municipal bonds (tax-exempt)	$ 88,654	$ 93,580	$ 98,262
Short-term investments, including overnight deposits	11,177	5,223	5,959
Dividends on equity securities	70,577	74,705	65,031
Income (loss) from equity method investments	6,852	(262)	4,766
Other	2,676	651	2,338
Total investment income	390,437	370,210	378,490
Investment expenses	(17,207)	(16,997)	(15,260)
Net investment income	373,230	353,213	363,230
Taxable Municipal Bonds [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Taxable bonds	65,749	57,550	49,345
Other Taxable Bonds [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Taxable bonds	$ 144,752	$ 138,763	$ 152,789

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Investments (Summary Of Net Realized Investment Gains And The Change In Net Unrealized Gains On Investments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Gain (Loss) on Investments [Line Items]
Realized gains	$ 76,752	$ 168,163	$ 74,978
Realized losses	(28,396)	(50,797)	(39,422)
Other-than-temporary impairment losses recognized in net income	(18,355)	(44,481)	(4,784)
Gains (losses) on securities measured at fair value through net income	16,791	(10,886)	10,444
Net realized investment gains	65,147	106,480	46,000
Change in net unrealized gains on investments included in other comprehensive income (loss)	342,111	(457,584)	981,035
Sales Of Fixed Maturities [Member]
Gain (Loss) on Investments [Line Items]
Realized gains	5,160	3,073	8,417
Realized losses	(704)	(4,598)	(18,136)
Sales Of Equity Securities [Member]
Gain (Loss) on Investments [Line Items]
Realized gains	70,177	156,987	51,356
Realized losses	(6,988)	(1,232)	(802)
Other [Member]
Gain (Loss) on Investments [Line Items]
Realized gains	1,415	8,103	15,205
Realized losses	(2,349)	(486)	(15,700)
Fixed Maturity Securities [Member]
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses recognized in net income	0	0	(304)
Change in net unrealized gains on investments included in other comprehensive income (loss)	(56,534)	(137,435)	480,350
Equity Securities [Member]
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses recognized in net income	(18,355)	(44,481)	(4,480)
Change in net unrealized gains on investments included in other comprehensive income (loss)	398,752	(320,277)	500,673
Short-Term Investments [Member]
Gain (Loss) on Investments [Line Items]
Change in net unrealized gains on investments included in other comprehensive income (loss)	$ (107)	$ 128	$ 12

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Investments (Summary Of Other-Than-Temporary Impairment Losses Recognized In Net Income And In Net Realized Investment Gains By Investment Type) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Other-than-temporary impairment losses recognized in net income	$ (18,355)	$ (44,481)	$ (4,784)
Commercial Mortgage-Backed [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Other-than-temporary impairment losses recognized in net income	0	0	(61)
Asset-Backed [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Other-than-temporary impairment losses recognized in net income	0	0	(197)
Corporate [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Other-than-temporary impairment losses recognized in net income	0	0	(46)
Fixed Maturity Securities [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Other-than-temporary impairment losses recognized in net income	0	0	(304)
Insurance, Banks And Other Financial Institutions [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Other-than-temporary impairment losses recognized in net income	(7,586)	(9,835)	(341)
Industrial, Consumer And All Other [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Other-than-temporary impairment losses recognized in net income	(10,769)	(34,646)	(4,139)
Equity Securities [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Other-than-temporary impairment losses recognized in net income	$ (18,355)	$ (44,481)	$ (4,480)

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Investments Investments (Components Of Restricted Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Components Of Restricted Assets [Line Items]
Restricted assets	$ 4,414,952	$ 4,783,202
Held In Trust Or On Deposit [Member]
Components Of Restricted Assets [Line Items]
Restricted assets	4,059,336	4,037,458
Cash And Cash Equivalents And Securities Pledged As Collateral [Member]
Components Of Restricted Assets [Line Items]
Restricted assets	$ 355,616	$ 745,744

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Investments (Schedule Of Restricted Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Investments, available-for-sale	$ 4,068,535	$ 4,343,070
Restricted cash and cash equivalents	346,417	440,132
Total	$ 4,414,952	$ 4,783,202

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Receivables (Components Of Receivables) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Receivables [Abstract]
Amounts receivable from agents, brokers and insureds	$ 1,061,190	$ 983,510
Trade accounts receivable	123,341	119,558
Investment management and performance fees receivable	38,735	0
Employee stock loans receivable (see note 12(c))	20,171	16,900
Other	10,122	6,165
Receivables, gross	1,253,559	1,126,133
Allowance for doubtful receivables	(11,910)	(12,430)
Receivables	$ 1,241,649	$ 1,113,703

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Deferred Policy Acquisition Costs (Amounts Of Policy Acquisition Costs Acquired, Deferred And Amortized) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance, beginning of year	$ 352,756	$ 353,410	$ 260,967
Policy acquisition costs deferred	823,840	752,324	754,303
Amortization of policy acquisition costs	(782,221)	(744,964)	(654,916)
Foreign currency movements	(1,965)	(8,014)	(6,944)
Deferred policy acquisition costs	$ 392,410	$ 352,756	$ 353,410

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Deferred Policy Acquisition Costs (Components Of Underwriting, Acquisition And Insurance Expenses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Deferred Policy Acquisition Costs Disclosures [Abstract]
Amortization of policy acquisition costs	$ 782,221	$ 744,964	$ 654,916
Other operating expenses	716,369	710,116	805,966
Underwriting, acquisition and insurance expenses	$ 1,498,590	$ 1,455,080	$ 1,460,882

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Property And Equipment (Components Of Property And Equipment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Land	$ 56,783	$ 56,408
Buildings	76,159	77,488
Leasehold improvements	95,898	104,003
Land improvements	74,040	71,585
Furniture and equipment	301,146	291,736
Other	162,385	134,939
Property and equipment, gross	766,411	736,159
Accumulated depreciation and amortization	(354,009)	(305,324)
Property and equipment	412,402	430,835
Depreciation and amortization expense of property and equipment	$ 64,800	$ 64,200	$ 51,200

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Goodwill And Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill And Intangible Assets [Line Items]
Goodwill impairment	$ (18,723)	$ (14,880)
Carrying value following impairment charge	1,142,248	1,167,844	$ 1,049,115
Amortization of intangible assets	68,533	68,947	57,627
Estimated amortization of intangible assets for 2017	67,400
Estimated amortization of intangible assets for 2018	66,000
Estimated amortization of intangible assets for 2019	58,000
Estimated amortization of intangible assets for 2020	51,600
Estimated amortization of intangible assets for 2021	50,000
Indefinite-lived intangible assets	48,200	48,200
Markel Ventures Operations [Member] | Industrial Manufacturing [Member]
Goodwill And Intangible Assets [Line Items]
Goodwill impairment	(18,700)
Carrying value following impairment charge	$ 0
Markel Ventures Operations [Member] | Healthcare [Member]
Goodwill And Intangible Assets [Line Items]
Goodwill impairment		(14,900)	$ (13,700)
Carrying value following impairment charge		$ 0

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Goodwill And Intangible Assets (Components Of Goodwill) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016		Dec. 31, 2015
Goodwill [Line Items]
Goodwill, beginning balance		$ 1,167,844		$ 1,049,115
Acquisitions (see note 2)				146,659
Impairment loss		(18,723)		(14,880)
Foreign currency movements and other adjustments		(6,873)		(13,050)
Goodwill, ending balance		1,142,248		1,167,844
U.S. Insurance [Member]
Goodwill [Line Items]
Goodwill, beginning balance		280,579		280,579
Acquisitions (see note 2)				0
Impairment loss		0		0
Foreign currency movements and other adjustments		0		0
Goodwill, ending balance		280,579		280,579
International Insurance [Member]
Goodwill [Line Items]
Goodwill, beginning balance		397,993		408,183
Acquisitions (see note 2)				0
Impairment loss		0		0
Foreign currency movements and other adjustments		(5,809)		(10,190)
Goodwill, ending balance		392,184		397,993
Reinsurance [Member]
Goodwill [Line Items]
Goodwill, beginning balance		122,745		122,745
Acquisitions (see note 2)				0
Impairment loss		0		0
Foreign currency movements and other adjustments		0		0
Goodwill, ending balance		122,745		122,745
Other [Member]
Goodwill [Line Items]
Goodwill, beginning balance	[1]	366,527	[2]	237,608
Acquisitions (see note 2)	[1]			146,659
Impairment loss	[1]	(18,723)		(14,880)
Foreign currency movements and other adjustments	[1]	(1,064)		(2,860)
Goodwill, ending balance	[1],[2]	346,740		366,527
Accumulated impairment losses	[2]	$ 47,300		$ 28,600

[1] Amounts included in Other above are related to the Company's non-insurance operations, which are not included in a reportable segment.

[2] Goodwill is net of accumulated impairment losses of $47.3 million and $28.6 million, as of December 31, 2016 and 2015, respectively, included in Other.

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Goodwill And Intangible Assets (Components Of Intangible Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Schedule of Indefinite-Lived And Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross carrying amount	$ 973,150	$ 992,776
Intangible assets, accumulated amortization	(250,608)	(200,404)
Customer Relationships [Member]
Schedule of Indefinite-Lived And Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross carrying amount	460,327	481,547
Intangible assets, accumulated amortization	(119,376)	(97,892)
Broker Relationships [Member]
Schedule of Indefinite-Lived And Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross carrying amount	183,092	182,626
Intangible assets, accumulated amortization	(56,888)	(45,135)
Trade Names [Member]
Schedule of Indefinite-Lived And Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross carrying amount	100,966	103,681
Intangible assets, accumulated amortization	(29,745)	(23,821)
Investment Management Agreements [Member]
Schedule of Indefinite-Lived And Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross carrying amount	98,000	98,000
Intangible assets, accumulated amortization	(7,000)	0
Technology [Member]
Schedule of Indefinite-Lived And Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross carrying amount	54,408	54,241
Intangible assets, accumulated amortization	(28,220)	(22,288)
Insurance Licenses [Member]
Schedule of Indefinite-Lived And Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross carrying amount	30,185	30,185
Intangible assets, accumulated amortization	0	0
Lloyd's Syndicate Capacity [Member]
Schedule of Indefinite-Lived And Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross carrying amount	12,000	12,000
Intangible assets, accumulated amortization	0	0
Other [Member]
Schedule of Indefinite-Lived And Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross carrying amount	34,172	30,496
Intangible assets, accumulated amortization	$ (9,379)	$ (11,268)

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Income Taxes (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Line Items]
Income tax payments	$ 142,200,000	$ 132,500,000	$ 89,500,000
Income taxes payable	$ 46,400,000	$ 63,500,000
Income tax benefit related to tax credits for foreign taxes paid	2.00%	8.00%	1.00%
Tax credit carryforwards	$ 23,037,000	$ 18,158,000
Tax credit, expiration date	Dec. 31, 2025
Net operating loss carryforwards	$ 18,100,000
Estimated gross deferred tax assets including net operating losses realized through generating taxable income or reversal of existing temporary differences attributable to gross deferred tax liabilities	659,400,000
Valuation allowance	(18,781,000)	(5,131,000)
Unrecognized tax benefits	8,876,000	$ 15,324,000	$ 17,700,000
Unrecognized tax benefits decrease on effective tax rate	8,600,000
Provision for United States income taxes on earnings of the Company's foreign subsidiaries	0
Undistributed earnings of foreign subsidiaries	615,000,000
Adjustment to the Company's income tax liabilities as a result of IRS examination	$ 0
Earliest Tax Year [Member]
Income Tax Disclosure [Line Items]
Operating loss carryforwards, expiration date	Dec. 31, 2028
Latest Tax Year [Member]
Income Tax Disclosure [Line Items]
Operating loss carryforwards, expiration date	Dec. 31, 2030
Markel Capital Limited [Member]
Income Tax Disclosure [Line Items]
Net operating loss carryforwards	$ 12,600,000
Markel Capital Limited [Member] | Earliest Tax Year [Member]
Income Tax Disclosure [Line Items]
Operating loss carryforwards, expiration date	Dec. 31, 2023
Markel Capital Limited [Member] | Latest Tax Year [Member]
Income Tax Disclosure [Line Items]
Operating loss carryforwards, expiration date	Dec. 31, 2033
Certain Branch Operations In Europe And Wholly Owned Subsidiary In Brazil [Member]
Income Tax Disclosure [Line Items]
Net operating loss carryforwards	$ 81,700,000
Certain Branch Operations In Europe And Wholly Owned Subsidiary In Brazil [Member] | Earliest Tax Year [Member]
Income Tax Disclosure [Line Items]
Operating loss carryforwards, expiration date	Dec. 31, 2020
Certain Branch Operations In Europe And Wholly Owned Subsidiary In Brazil [Member] | Latest Tax Year [Member]
Income Tax Disclosure [Line Items]
Operating loss carryforwards, expiration date	Dec. 31, 2025
Certain Branch Operations In Europe And Wholly Owned Subsidiary In Brazil [Member] | Subject To Expiration [Member]
Income Tax Disclosure [Line Items]
Net operating loss carryforwards	$ 20,400,000

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Income Taxes (Components Of Income Before Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Domestic operations	$ 288,905	$ 323,954	$ 240,279
Foreign operations	341,015	418,151	200,099
Income Before Income Taxes	$ 629,920	$ 742,105	$ 440,378

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Income Taxes (Components Of Income Tax Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Domestic, current	$ 57,916	$ 44,406	$ 7,573
Foreign, current	48,203	118,235	24,574
Total current tax expense	106,119	162,641	32,147
Domestic, deferred	19,991	9,415	43,673
Foreign, deferred	43,367	(19,093)	40,870
Total deferred tax expense (benefit)	63,358	(9,678)	84,543
Income tax expense	$ 169,477	$ 152,963	$ 116,690

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Income Taxes (Reconciliations Of United States Corporate Income Tax Rate To Effective Tax Rate On Income Before Income Taxes) (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
United States corporate tax rate	35.00%	35.00%	35.00%
Tax-exempt investment income	(6.00%)	(5.00%)	(9.00%)
Foreign tax credits	(2.00%)	(8.00%)	(1.00%)
Foreign operations	1.00%	(1.00%)	0.00%
Other	(1.00%)	0.00%	1.00%
Effective tax rate	27.00%	21.00%	26.00%

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Income Taxes (Components Of Domestic And Foreign Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Unpaid losses and loss adjustment expenses	$ 181,303	$ 212,012
Life and annuity benefits	135,075	156,950
Unearned premiums recognized for income tax purposes	121,852	102,076
Accrued incentive compensation	67,719	53,586
Investments, including other-than-temporary impairments	58,248	65,641
Net operating loss carryforwards	26,743	18,771
Tax credit carryforwards	23,037	18,158
Stock-based compensation	19,235	21,948
Other differences between financial reporting and tax bases	44,942	40,497
Total gross deferred tax assets	678,154	689,639
Less valuation allowance	(18,781)	(5,131)
Total gross deferred tax assets, net of allowance	659,373	684,508
Net unrealized gains on investments	723,198	626,776
Deferred policy acquisition costs	128,302	88,036
Amortization of goodwill and other intangible assets	102,631	107,271
Other differences between financial reporting and tax bases	35,727	38,613
Total gross deferred tax liabilities	989,858	860,696
Net deferred tax liability	$ 330,485	$ 176,188

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Income Taxes (Reconciliation Of Beginning And Ending Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Unrecognized tax benefits, beginning of year	$ 15,324	$ 17,700
Decreases for tax positions taken in prior years	0	(146)
Lapse of statute of limitations	(6,448)	(606)
Settlement with taxing authorities	0	(1,624)
Unrecognized tax benefits, end of year	$ 8,876	$ 15,324

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Unpaid Losses And Loss Adjustment Expenses (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Oct. 30, 2015	Mar. 09, 2015	Dec. 31, 2013	Dec. 31, 2012
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Favorable development related to the commutation of a property and casualty deposit contract	$ (11,700)
Adverse (favorable) development on prior years' loss reserves	(493,495)	$ (627,800)	$ (435,545)
Prior years' adverse (favorable) development on asbestos and environmental exposures	(5,277)	25,415	32,840
Loss on retrospective reinsurance transaction recognized in losses and loss adjustment expenses		7,100
Increase in asbestos and environmental prior years’ loss reserves following the retroactive reinsurance transaction		15,000
Net reserves for losses and loss adjustment expenses of acquired insurance companies	0	0	21,193
Liability for asbestos and environmental claims net incurred loss annual claim review	0	0	27,200
Unamortized fair value adjustment included in unpaid losses and loss adjustment expenses	$ 68,900	$ 91,000
IBNR reserves as a percentage of total unpaid losses and loss adjustment expenses	67.00%	65.00%
Asbestos-related reserves, gross loss incurred	$ 323,904	$ 386,625	390,442
Asbestos-related reserves, net loss incurred	111,604	132,869	287,723			$ 272,194
Asbestos and environmental net reserves for reported claims	104,100
Asbestos and environmental reserves incurred but not reported, net	7,500
Liability for asbestos and environmental claims, net claims paid since inception	612,000
Reinsurance recoverable on retroactive reinsurance transactions attributable to A&E exposures	0	159,641	0
Liability for asbestos and environmental claims, net litigation paid since inception	93,600
Reinsurance recoverable on retroactive reinsurance transactions	0	177,649	0
U.S. Insurance [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance	5,565,888
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance	2,897,849
U.S. Insurance [Member] | 2012 Accident Year [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance	909,237	924,621	924,138			985,721	$ 949,141
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance	$ 728,802	644,658	546,635			401,773	193,708
Cumulative number of reported claims	106
U.S. Insurance [Member] | 2012 Accident Year [Member] | Alterra [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance						97,400
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance						22,600
U.S. Insurance [Member] | 2013 Accident Year [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance	$ 1,009,438	1,042,100	1,105,927			1,130,681
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance	$ 725,782	594,558	443,392			222,890
Cumulative number of reported claims	65
U.S. Insurance [Member] | 2013 Accident Year [Member] | Alterra [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance						149,900
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance						23,200
International Insurance [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance	$ 2,461,912
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance	1,021,220
International Insurance [Member] | 2012 Accident Year [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance	479,558	495,641	557,604			616,641	412,684
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance	$ 319,843	289,517	230,882			163,805	38,992
Cumulative number of reported claims	18
International Insurance [Member] | 2012 Accident Year [Member] | Alterra [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance						158,000
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance						14,000
International Insurance [Member] | 2013 Accident Year [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance	$ 446,568	476,433	581,164			597,145
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance	$ 220,625	182,173	126,699			47,887
Cumulative number of reported claims	17
International Insurance [Member] | 2013 Accident Year [Member] | Alterra [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance						162,700
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance						6,200
International Insurance [Member] | 2012 To 2016 Accident Years [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Percentage of cumulative incurred losses and allocated loss adjustment expenses, net of reinsurance from managing agents	4.00%
Reinsurance [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance	$ 2,564,809
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance	941,098
Reinsurance [Member] | 2012 Accident Year [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance	455,103	482,836	503,410			545,939	72,250
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance	230,742	183,321	128,174			64,209	$ 3,955
Reinsurance [Member] | 2012 Accident Year [Member] | Alterra [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance						471,000
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance						52,400
Reinsurance [Member] | 2013 Accident Year [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance	531,955	545,743	574,760			581,963
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance	268,052	209,256	154,494			71,182
Reinsurance [Member] | 2013 Accident Year [Member] | Alterra [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance						531,800
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance						$ 68,600
Impact Of Retroactive Reinsurance Transactions On Reserve Volatility [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Adverse (favorable) development on prior years' loss reserves		(82,700)
Asbestos [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Asbestos-related reserves, gross loss incurred	252,100
Asbestos-related reserves, net loss incurred	90,000
Long Tail Casualty U.S. Insurance And Intl Marine And Energy Intl And Property U.S. Insurance And Reinsurance Segments [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Adverse (favorable) development on prior years' loss reserves	(418,000)
Specified Medical And Medical Malpractice [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Adverse (favorable) development on prior years' loss reserves	$ 71,200
General Liability Workers Compensation Inland Marine And Brokerage Property Within U.S. Insurance Segment And General Liability Professional Liability And Marine And Energy Within International Segment [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Adverse (favorable) development on prior years' loss reserves		$ (375,800)
Long-Tail Casualty And Professional Liability Witihin U.S. Insurance Segment And Professional Liability And Marine And Energy International Segment [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Adverse (favorable) development on prior years' loss reserves			$ (250,400)
Personal Lines [Member] | U.S. Insurance [Member] | 2012 Accident Year [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Cumulative number of reported claims	65
Personal Lines [Member] | U.S. Insurance [Member] | 2013 Accident Year [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Cumulative number of reported claims	16
March 9, 2015 [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Total payment under retrospective reinsurance transaction on ceded asbestos and environmental policies					$ 89,000
Cash paid at closing under retrospective reinsurance transaction on ceded asbestos and environmental policies					69,900
Cumulative amount of reserves for losses and loss adjustment expenses on ceded asbestos and environmental policies					94,100
Deferred gain under retrospective reinsurance transaction on ceded asbestos and environmental policies					$ 5,100
October 30, 2015 [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Total payment under retrospective reinsurance transaction on ceded asbestos and environmental policies				$ 86,500
Cumulative amount of reserves for losses and loss adjustment expenses on ceded asbestos and environmental policies				173,400
Cumulative reserves for losses and loss adjustment expenses on ceded asbestos and environmental policies, net of retention				76,400
Loss on retrospective reinsurance transaction				$ 10,100

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Unpaid Losses And Loss Adjustment Expenses (Reconciliation Of Consolidated Reserves For Losses And Loss Adjustment Expenses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Net reserves for losses and loss adjustment expenses, beginning of year	$ 8,235,288	$ 8,535,483	$ 8,407,642
Foreign currency movements	(129,692)	(134,173)	(137,385)
Adjusted net reserves for losses and loss adjustment expenses, beginning of year	8,105,596	8,401,310	8,270,257
Incurred losses and loss adjustment expenses, current year	2,555,902	2,566,545	2,638,012
Incurred losses and loss adjustment expenses, prior years	(493,495)	(627,800)	(435,545)
Total incurred losses and loss adjustment expenses	2,062,407	1,938,745	2,202,467
Payments, current year	532,140	486,551	502,107
Payments, prior years	1,529,206	1,423,286	1,436,851
Total payments	2,061,346	1,909,837	1,938,958
Effect of foreign currency rate changes	2,060	(17,281)	(19,476)
Net reserves for losses and loss adjustment expenses of acquired insurance companies	0	0	21,193
Reinsurance recoverable on retroactive reinsurance transactions	0	(177,649)	0
Net reserves for losses and loss adjustment expenses, end of year	8,108,717	8,235,288	8,535,483
Reinsurance recoverable on unpaid losses	2,006,945	2,016,665	1,868,669
Gross reserves for losses and loss adjustment expenses, end of year	$ 10,115,662	$ 10,251,953	$ 10,404,152

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Unpaid Losses And Loss Adjustment Expenses (Ultimate Incurred Losses And Cumulative Paid Losses And Allocated Loss Adjustment Expenses, Net Of Reinsurance) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Claims Development [Line Items]
Total liabilities for unpaid losses and loss adjustment expenses, net of reinsurance	$ 7,828,041
U.S. Insurance [Member]
Claims Development [Line Items]
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance	5,565,888
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance	2,897,849
All outstanding liabilities for unpaid losses and loss adjustment expenses before 2012, net of reinsurance	402,534
Total liabilities for unpaid losses and loss adjustment expenses, net of reinsurance	3,070,573
U.S. Insurance [Member] | 2012 Accident Year [Member]
Claims Development [Line Items]
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance	909,237	$ 924,621	$ 924,138	$ 985,721	$ 949,141
Total of incurred-but-not-reported liabilities, net of reinsurance	$ 117,333
Cumulative number of reported claims	106
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance	$ 728,802	644,658	546,635	401,773	193,708
U.S. Insurance [Member] | 2013 Accident Year [Member]
Claims Development [Line Items]
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance	1,009,438	1,042,100	1,105,927	1,130,681
Total of incurred-but-not-reported liabilities, net of reinsurance	$ 175,309
Cumulative number of reported claims	65
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance	$ 725,782	594,558	443,392	222,890
U.S. Insurance [Member] | 2014 Accident Year [Member]
Claims Development [Line Items]
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance	1,116,093	1,140,685	1,278,116
Total of incurred-but-not-reported liabilities, net of reinsurance	$ 290,827
Cumulative number of reported claims	56
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance	$ 650,118	487,068	264,697
U.S. Insurance [Member] | 2015 Accident Year [Member]
Claims Development [Line Items]
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance	1,211,389	1,285,411
Total of incurred-but-not-reported liabilities, net of reinsurance	$ 500,705
Cumulative number of reported claims	55
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance	$ 514,497	260,121
U.S. Insurance [Member] | 2016 Accident Year [Member]
Claims Development [Line Items]
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance	1,319,731
Total of incurred-but-not-reported liabilities, net of reinsurance	$ 781,984
Cumulative number of reported claims	49
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance	$ 278,650
International Insurance [Member]
Claims Development [Line Items]
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance	2,461,912
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance	1,021,220
All outstanding liabilities for unpaid losses and loss adjustment expenses before 2012, net of reinsurance	570,940
Total liabilities for unpaid losses and loss adjustment expenses, net of reinsurance	2,011,632
International Insurance [Member] | 2012 Accident Year [Member]
Claims Development [Line Items]
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance	479,558	495,641	557,604	616,641	412,684
Total of incurred-but-not-reported liabilities, net of reinsurance	$ 87,383
Cumulative number of reported claims	18
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance	$ 319,843	289,517	230,882	163,805	38,992
International Insurance [Member] | 2013 Accident Year [Member]
Claims Development [Line Items]
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance	446,568	476,433	581,164	597,145
Total of incurred-but-not-reported liabilities, net of reinsurance	$ 155,062
Cumulative number of reported claims	17
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance	$ 220,625	182,173	126,699	47,887
International Insurance [Member] | 2014 Accident Year [Member]
Claims Development [Line Items]
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance	502,708	545,954	577,454
Total of incurred-but-not-reported liabilities, net of reinsurance	$ 149,455
Cumulative number of reported claims	16
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance	$ 240,050	167,568	65,683
International Insurance [Member] | 2015 Accident Year [Member]
Claims Development [Line Items]
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance	489,119	488,649
Total of incurred-but-not-reported liabilities, net of reinsurance	$ 222,864
Cumulative number of reported claims	16
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance	$ 148,037	61,556
International Insurance [Member] | 2016 Accident Year [Member]
Claims Development [Line Items]
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance	543,959
Total of incurred-but-not-reported liabilities, net of reinsurance	$ 279,320
Cumulative number of reported claims	13
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance	$ 92,665
Reinsurance [Member]
Claims Development [Line Items]
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance	2,564,809
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance	941,098
All outstanding liabilities for unpaid losses and loss adjustment expenses before 2012, net of reinsurance	840,563
Total liabilities for unpaid losses and loss adjustment expenses, net of reinsurance	2,464,274
Reinsurance [Member] | 2012 Accident Year [Member]
Claims Development [Line Items]
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance	455,103	482,836	503,410	545,939	72,250
Total of incurred-but-not-reported liabilities, net of reinsurance	137,778
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance	230,742	183,321	128,174	64,209	$ 3,955
Reinsurance [Member] | 2013 Accident Year [Member]
Claims Development [Line Items]
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance	531,955	545,743	574,760	581,963
Total of incurred-but-not-reported liabilities, net of reinsurance	179,519
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance	268,052	209,256	154,494	$ 71,182
Reinsurance [Member] | 2014 Accident Year [Member]
Claims Development [Line Items]
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance	536,274	565,252	575,479
Total of incurred-but-not-reported liabilities, net of reinsurance	209,246
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance	228,293	158,104	$ 97,617
Reinsurance [Member] | 2015 Accident Year [Member]
Claims Development [Line Items]
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance	511,959	526,286
Total of incurred-but-not-reported liabilities, net of reinsurance	306,717
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance	134,530	$ 63,963
Reinsurance [Member] | 2016 Accident Year [Member]
Claims Development [Line Items]
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance	529,518
Total of incurred-but-not-reported liabilities, net of reinsurance	382,407
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance	$ 79,481

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Unpaid Losses And Loss Adjustment Expenses (Average Annual Percentage Payout Of Incurred Losses By Age (in Years), Net Of Reinsurance) (Details)	Dec. 31, 2016
U.S. Insurance [Member]
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Average annual percentage payout of incurred losses in year 1	21.90%
Average annual percentage payout of incurred losses in year 2	21.40%
Average annual percentage payout of incurred losses in year 3	15.20%
Average annual percentage payout of incurred losses in year 4	11.90%
Average annual percentage payout of incurred losses in year 5	9.30%
International Insurance [Member]
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Average annual percentage payout of incurred losses in year 1	12.30%
Average annual percentage payout of incurred losses in year 2	20.40%
Average annual percentage payout of incurred losses in year 3	13.60%
Average annual percentage payout of incurred losses in year 4	10.40%
Average annual percentage payout of incurred losses in year 5	6.30%
Reinsurance [Member]
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Average annual percentage payout of incurred losses in year 1	12.00%
Average annual percentage payout of incurred losses in year 2	13.50%
Average annual percentage payout of incurred losses in year 3	12.50%
Average annual percentage payout of incurred losses in year 4	11.60%
Average annual percentage payout of incurred losses in year 5	10.40%

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Unpaid Losses And Loss Adjustment Expenses (Reconciliation Of Net Incurred And Paid Loss Development Tables, By Segment, To The Liability For Losses And Loss Adjustment Expenses In The Consolidated Balance Sheet) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Liabilities for for unpaid losses and loss adjustment expenses, net of reinsurance	$ 7,828,041
Reinsurance recoverable on unpaid losses	2,006,945
Unallocated loss adjustment expenses	211,777
Unamortized fair value adjustments on acquired reserves for losses and loss adjustment expenses	68,899
Total reconciling items	280,676
Liability for unpaid losses and loss adjustment expenses	10,115,662	$ 10,251,953	$ 10,404,152
U.S. Insurance [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Liabilities for for unpaid losses and loss adjustment expenses, net of reinsurance	3,070,573
Reinsurance recoverable on unpaid losses	631,608
Liability for unpaid losses and loss adjustment expenses	3,849,541	3,720,429
International Insurance [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Liabilities for for unpaid losses and loss adjustment expenses, net of reinsurance	2,011,632
Reinsurance recoverable on unpaid losses	982,127
Liability for unpaid losses and loss adjustment expenses	3,062,725	3,140,000
Reinsurance [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Liabilities for for unpaid losses and loss adjustment expenses, net of reinsurance	2,464,274
Reinsurance recoverable on unpaid losses	140,629
Liability for unpaid losses and loss adjustment expenses	2,661,209	2,750,258
Other Insurance (Discontinued Lines) [Member]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Liabilities for for unpaid losses and loss adjustment expenses, net of reinsurance	281,562
Reinsurance recoverable on unpaid losses	252,581
Liability for unpaid losses and loss adjustment expenses	$ 542,187	$ 641,266

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Unpaid Losses And Loss Adjustment Expenses (Reconciliation Of Consolidated A&E Reserves For Losses And Loss Adjustment Expenses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Net reserves for A&E losses and loss adjustment expenses, beginning of year	$ 132,869	$ 287,723	$ 272,194
Incurred losses and loss adjustment expenses	(5,277)	25,415	32,840
Payments	(15,988)	(20,628)	(17,311)
Reinsurance recoverable on retroactive reinsurance transactions	0	(159,641)	0
Net reserves for A&E losses and loss adjustment expenses, end of year	111,604	132,869	287,723
Reinsurance recoverable on unpaid losses	212,300	253,756	102,719
Gross reserves for A&E losses and loss adjustment expenses, end of year	$ 323,904	$ 386,625	$ 390,442

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Life And Annuity Benefits (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Apr. 24, 2015
Liability for Future Policy Benefits [Abstract]
Average reserve valuation rate	2.30%
Life and annuity benefits reserve single contract concentration	32.90%
Annuities included in life and annuity benefits subject to discretionary withdrawal	$ 0
Cash payments for life and annuity benefit policies transferred under novated reinsurance contract		$ 29,000
Reserves on novated life and annuity benefit reinsurance contract		32,600
Gain on novated life and annuity benefit reinsurance contract		$ 3,600

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Life And Annuity Benefits (Schedule Of Life And Annuity Benefits) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Liability for Future Policy Benefits [Abstract]
Life	$ 131,768	$ 142,068
Annuities	849,226	901,218
Accident and health	68,660	79,989
Total life and annuity benefits	$ 1,049,654	$ 1,123,275

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Senior Long-Term Debt And Other Debt (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Loss on early extinguishment of debt		$ 44,100	$ 0	$ 0
Senior long-term debt and other debt, estimated fair value		2,721,000	2,403,000
Interest on senior long-term debt and other debt		135,400	127,000	$ 125,800
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, capacity available		300,000
Line of credit facility, potential increased maximum capacity		$ 500,000
Line of credit facility, unused capacity, commitment fee, percent		0.225%
Borrowings outstanding under the facility		$ 0	$ 0
Secured Letters Of Credit [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, capacity available		200,000
Markel Diversified Fund [Member]
Debt Instrument [Line Items]
Note payable included in total liabilities of the Markel Diversified Fund delivered as part of the consideration provided for its investment		$ 62,500
Unsecured Senior Notes [Member] | 7.20% Unsecured Senior Notes Due April 14, 2017 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate		7.20%	7.20%
Unsecured Senior Notes [Member] | 6.25% Unsecured Senior Notes Due September 30, 2020 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate		6.25%	6.25%
Unsecured Senior Notes [Member] | 5.0% Unsecured Senior Notes Due April 5, 2046 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 500,000
Debt instrument, interest rate	5.00%	5.00%
Net proceeds from issuance of unsecured senior notes	$ 493,100
Unsecured Senior Notes [Member] | 7.35% Unsecured Senior Notes Due August 15, 2034 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate	7.35%	7.35%	7.35%
Debt instrument, repurchased face amount	$ 70,200
Early repayment of senior debt	$ 95,000
Unsecured Senior Notes [Member] | 7.125% Unsecured Senior Notes Due September 30, 2019 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate	7.125%	7.125%	7.125%
Debt instrument, repurchased face amount	$ 108,800
Early repayment of senior debt	$ 126,400

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Senior Long-Term Debt And Other Debt (Summary Of Senior Long-Term Debt And Other Debt) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Senior long-term debt and other debt	$ 2,574,529		$ 2,239,271
Unsecured Senior Notes [Member] | 7.20% Unsecured Senior Notes Due April 14, 2017 [Member]
Debt Instrument [Line Items]
Unsecured senior notes	$ 91,046		$ 92,436
Debt instrument, interest rate	7.20%		7.20%
Debt Instrument, unamortized premium	$ 417		$ 1,808
Unsecured Senior Notes [Member] | 7.125% Unsecured Senior Notes Due September 30, 2019 [Member]
Debt Instrument [Line Items]
Unsecured senior notes	$ 234,183		$ 346,725
Debt instrument, interest rate	7.125%	7.125%	7.125%
Debt instrument, unamortized discount	$ 522		$ 1,060
Unsecured Senior Notes [Member] | 6.25% Unsecured Senior Notes Due September 30, 2020 [Member]
Debt Instrument [Line Items]
Unsecured senior notes	$ 385,714		$ 394,464
Debt instrument, interest rate	6.25%		6.25%
Debt Instrument, unamortized premium	$ 35,717		$ 44,519
Unsecured Senior Notes [Member] | 5.35% Unsecured Senior Notes Due June 1, 2021 [Member]
Debt Instrument [Line Items]
Unsecured senior notes	$ 248,957		$ 248,694
Debt instrument, interest rate	5.35%		5.35%
Debt instrument, unamortized discount	$ 912		$ 1,119
Unsecured Senior Notes [Member] | 4.90% Unsecured Senior Notes Due July 1, 2022 [Member]
Debt Instrument [Line Items]
Unsecured senior notes	$ 348,215		$ 347,891
Debt instrument, interest rate	4.90%		4.90%
Debt instrument, unamortized discount	$ 1,536		$ 1,815
Unsecured Senior Notes [Member] | 3.625% Unsecured Senior Notes Due March 30, 2023 [Member]
Debt Instrument [Line Items]
Unsecured senior notes	$ 248,508		$ 248,277
Debt instrument, interest rate	3.625%		3.625%
Debt instrument, unamortized discount	$ 1,257		$ 1,458
Unsecured Senior Notes [Member] | 7.35% Unsecured Senior Notes Due August 15, 2034 [Member]
Debt Instrument [Line Items]
Unsecured senior notes	$ 128,570		$ 197,923
Debt instrument, interest rate	7.35%	7.35%	7.35%
Debt instrument, unamortized discount	$ 1,212		$ 1,972
Unsecured Senior Notes [Member] | 5.0% Unsecured Senior Notes Due March 30, 2043 [Member]
Debt Instrument [Line Items]
Unsecured senior notes	$ 243,796		$ 243,559
Debt instrument, interest rate	5.00%		5.00%
Debt instrument, unamortized discount	$ 5,879		$ 6,103
Unsecured Senior Notes [Member] | 5.0% Unsecured Senior Notes Due April 5, 2046 [Member]
Debt Instrument [Line Items]
Unsecured senior notes	$ 491,943		0
Debt instrument, interest rate	5.00%	5.00%
Debt instrument, unamortized discount	$ 7,154
Other Debt [Member]
Debt Instrument [Line Items]
Senior long-term debt and other debt	$ 153,597		$ 119,302
Other Debt [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate	1.70%
Other Debt [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate	6.50%

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Senior Long-Term Debt And Other Debt (Summary Of Future Principal Payments Due At Maturity On Senior Long-Term Debt And Other Debt) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Debt Disclosure [Abstract]
2017	$ 183,916
2018	6,365
2019	239,633
2020	359,332
2021	284,758
2022 and thereafter	1,485,404
Total principal payments	2,559,408
Net unamortized premium	17,662
Net unamortized debt issuance costs	(2,541)
Senior long-term debt and other debt	$ 2,574,529	$ 2,239,271

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Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares authorized	50,000,000	50,000,000
Common stock, par value	$ 0	$ 0
Common stock, shares issued	13,954,931	13,959,018
Common stock, shares outstanding	13,954,931	13,959,018
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, par value	$ 0	$ 0
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
November 2013 Share Repurchase Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Board of Directors approved the repurchase of common stock under a share repurchase program, maximum	$ 300.0
Cumulative number of common stock shares repurchased	96,345
Cumulative stock repurchased value	$ 70.7
2016 Employee Stock Purchase And Bonus Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Bonus calculation percentage based on the value of stocks acquired by employees	10.00%
Percentage of bonus shares award to loan program participants	5.00%
Shares authorized under the 2016 Employee Stock Purchase and Bonus Plan	125,000
Number of shares available for purchase	118,692
Loans outstanding under 2016 Employee Stock Purchase and Bonus Plan	$ 20.2	$ 16.9
Employee Stock Purchase And Bonus Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued under the prior Employee Stock Purchase and Bonus Plan since the effective date of the 2016 Employee Stock Purchase and Bonus Plan	0
Number of shares available for purchase		9,458
2012 Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based awards issued under the 2012 Compensation Plan since the effective date of the 2016 Compensation Plan	0
2016 Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for future awards	248,025
2016 Compensation Plan [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock units awarded	15,614
Weighted average grant-date fair value, share-based awards	$ 878.03	$ 740.80	$ 583.74
Unrecognized compensation cost related to nonvested share-based awards	$ 10.7
Weighted average remaining service period of share-based awards	1 year 7 months
Fair value of the vested share-based awards	$ 29.8	$ 15.8	$ 4.2
2016 Compensation Plan [Member] | Restricted Stock Units (RSUs) [Member] | Non-Employee Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock units awarded	1,050
Restricted stock awards, year awards vest	2017
2016 Compensation Plan [Member] | Restricted Stock Units (RSUs) [Member] | Performance Based [Member] | Associates And Executive Officers [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of common stock issuable for each vested restricted stock unit	1
Number of restricted stock units awarded	12,664
Restricted stock awards, vesting period	3 years
2016 Compensation Plan [Member] | Restricted Stock Units (RSUs) [Member] | Retention And Hiring [Member] | Associates And Executive Officers [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of common stock issuable for each vested restricted stock unit	1
Number of restricted stock units awarded	1,900
Restricted stock units, grant date fair value	$ 1.7
Restricted stock awards, vesting period	3 years

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Shareholders' Equity (Schedule Of Net Income Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Earnings Per Share [Line Items]
Net income to shareholders	$ 132,726	$ 83,796	$ 78,797	$ 160,370	$ 197,892	$ 102,519	$ 91,369	$ 190,992	$ 117,595	$ 75,803	$ 40,068	$ 87,716	$ 455,689	$ 582,772	$ 321,182
Adjustment of redeemable noncontrolling interests													(15,472)	4,144	(8,186)
Adjusted net income to shareholders													$ 440,217	$ 586,916	$ 312,996
Basic common shares outstanding													14,013	13,978	13,984
Diluted shares outstanding													14,078	14,061	14,057
Basic net income per share (dollars per share)	$ 9.14	$ 5.62	$ 5.44	$ 11.21	$ 14.23	$ 7.43	$ 6.76	$ 13.57	$ 8.10	$ 5.33	$ 2.67	$ 6.28	$ 31.41	$ 41.99	$ 22.38
Diluted net income per share (dollars per share)	$ 9.11	$ 5.60	$ 5.41	$ 11.15	$ 14.14	$ 7.39	$ 6.72	$ 13.49	$ 8.05	$ 5.30	$ 2.66	$ 6.25	$ 31.27	$ 41.74	$ 22.27
Stock Options [Member]
Earnings Per Share [Line Items]
Dilutive potential common shares													4	9	11
Restricted Stock Units (RSUs) [Member]
Earnings Per Share [Line Items]
Dilutive potential common shares													61	74	62

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Shareholders' Equity (Summary Of Nonvested Share-Based Awards) (Details) - 2016 Compensation Plan [Member] - Restricted Stock Units (RSUs) [Member] - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Number of awards, nonvested awards, beginning balance	103,883
Number of awards, granted	15,614
Number of awards, vested	(53,798)
Number of awards, forfeited	(81)
Number of awards, nonvested awards, ending balance	65,618	103,883
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted average grant-date fair value, nonvested awards, beginning balance	$ 556.66
Weighted average grant-date fair value, granted	878.03	$ 740.80	$ 583.74
Weighted average grant-date fair value, vested	554.62
Weighted average grant-date fair value, forfeited	632.82
Weighted average grant-date fair value, nonvested awards, ending balance	$ 634.71	$ 556.66

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Other Comprehensive Income (Loss) (Change In Accumulated Other Comprehensive Income By Component, Net Of Taxes And Noncontrolling Interests) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income, beginning balance	$ 1,354,508	$ 1,704,557	$ 1,089,805
Other comprehensive income (loss) before reclassifications	243,286	(271,697)	639,147
Amounts reclassified from accumulated other comprehensive income	(31,928)	(78,352)	(24,395)
Total other comprehensive income (loss)	211,358	(350,049)	614,752
Accumulated other comprehensive income, ending balance	1,565,866	1,354,508	1,704,557
Unrealized Holding Gains On Available-For-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income, beginning balance	1,472,762	1,793,254	1,131,507
Other comprehensive income (loss) before reclassifications	275,696	(240,010)	687,908
Amounts reclassified from accumulated other comprehensive income	(33,528)	(80,482)	(26,161)
Total other comprehensive income (loss)	242,168	(320,492)	661,747
Accumulated other comprehensive income, ending balance	1,714,930	1,472,762	1,793,254
Foreign Currency [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income, beginning balance	(72,696)	(43,491)	(11,246)
Other comprehensive income (loss) before reclassifications	(11,710)	(29,205)	(32,245)
Amounts reclassified from accumulated other comprehensive income	0	0	0
Total other comprehensive income (loss)	(11,710)	(29,205)	(32,245)
Accumulated other comprehensive income, ending balance	(84,406)	(72,696)	(43,491)
Net Actuarial Pension Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income, beginning balance	(45,558)	(45,206)	(30,456)
Other comprehensive income (loss) before reclassifications	(20,700)	(2,482)	(16,516)
Amounts reclassified from accumulated other comprehensive income	1,600	2,130	1,766
Total other comprehensive income (loss)	(19,100)	(352)	(14,750)
Accumulated other comprehensive income, ending balance	$ (64,658)	$ (45,558)	$ (45,206)

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Other Comprehensive Income (Loss) (Schedule Of Tax Expense (Benefit) Of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Other Comprehensive Income (Loss), Tax [Abstract]
Net holding gains (losses) arising during the period	$ 112,399	$ (107,860)	$ 328,564
Change in unrealized other-than-temporary impairment losses on fixed maturities arising during the period	6	35	614
Reclassification adjustments for net gains included in net income	(12,462)	(29,267)	(9,890)
Change in net unrealized gains on investments	99,943	(137,092)	319,288
Change in foreign currency translation adjustments	1,037	408	1,918
Change in net actuarial pension loss	(4,192)	(88)	(3,687)
Total	$ 96,788	$ (136,772)	$ 317,519

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Other Comprehensive Income (Loss) (Amounts Reclassified From Accumulated Other Comprehensive Income Into Income, By Component) (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reclassification Out Of Accumulated Other Comprehensive Income [Line Items]
Other-than-temporary impairment losses recognized in net income													$ (18,355)	$ (44,481)	$ (4,784)
Net realized investment gains, excluding other-than-temporary impairment losses													83,502	150,961	50,784
Income Before Income Taxes													629,920	742,105	440,378
Underwriting, acquisition and insurance expenses													(1,498,590)	(1,455,080)	(1,460,882)
Income Taxes													(169,477)	(152,963)	(116,690)
Net Income	$ 132,703	$ 83,421	$ 80,673	$ 163,646	$ 198,273	$ 104,410	$ 92,453	$ 194,006	$ 118,222	$ 76,824	$ 41,141	$ 87,501	460,443	589,142	323,688
Reclassification Out Of Accumulated Other Comprehensive Income [Member] | Unrealized Holding Gains On Available-For-Sale Securities [Member]
Reclassification Out Of Accumulated Other Comprehensive Income [Line Items]
Other-than-temporary impairment losses recognized in net income													(18,355)	(44,481)	(4,784)
Net realized investment gains, excluding other-than-temporary impairment losses													64,345	154,230	40,835
Income Before Income Taxes													45,990	109,749	36,051
Income Taxes													(12,462)	(29,267)	(9,890)
Net Income													33,528	80,482	26,161
Reclassification Out Of Accumulated Other Comprehensive Income [Member] | Net Actuarial Pension Loss [Member]
Reclassification Out Of Accumulated Other Comprehensive Income [Line Items]
Underwriting, acquisition and insurance expenses													(1,951)	(2,662)	(2,084)
Income Taxes													351	532	318
Net Income													$ (1,600)	$ (2,130)	$ (1,766)

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Fair Value Measurements (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, level 1 to level 2 transfers, amount	$ 0	$ 0
Fair value, level 2 to level 1 transfers, amount	0	0
Assets measured at fair value on a non-recurring basis	0	0
Liabilities measured at fair value on a non-recurring basis	$ 0	$ 0
Short-Term Investments [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment maturity period	1 year

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Fair Value Measurements (Balances Of Assets Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, estimated fair value	$ 9,891,510	$ 9,394,468
Equity securities	4,745,841	4,074,475
Short-term investments	2,336,151	1,642,261
Total investments available-for-sale	16,973,502	15,111,204
Fixed Maturity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total investments available-for-sale	9,891,510	9,394,468
U.S. Treasury [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total investments available-for-sale	258,584	309,417
U.S. Government-Sponsored Enterprises [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total investments available-for-sale	423,212	391,290
Obligations Of States, Municipalities And Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total investments available-for-sale	4,428,205	4,013,213
Foreign Governments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total investments available-for-sale	1,463,462	1,416,457
Commercial Mortgage-Backed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total investments available-for-sale	1,040,356	659,538
Residential Mortgage-Backed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total investments available-for-sale	790,946	854,247
Asset-Backed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total investments available-for-sale	27,338	36,071
Corporate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total investments available-for-sale	1,459,407	1,714,235
Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total investments available-for-sale	4,745,841	4,074,475
Insurance, Banks And Other Financial Institutions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total investments available-for-sale	1,697,810	1,334,722
Industrial, Consumer And All Other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total investments available-for-sale	3,048,031	2,739,753
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, estimated fair value	9,891,510	9,394,468
Equity securities	4,745,841	4,074,475
Short-term investments	2,336,151	1,642,261
Total investments available-for-sale	16,973,502	15,111,204
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, estimated fair value	0	0
Equity securities	4,554,638	4,074,475
Short-term investments	2,255,898	1,529,924
Total investments available-for-sale	6,810,536	5,604,399
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, estimated fair value	9,891,510	9,394,468
Equity securities	0	0
Short-term investments	80,253	112,337
Total investments available-for-sale	9,971,763	9,506,805
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, estimated fair value	0	0
Equity securities	191,203	0
Short-term investments	0	0
Total investments available-for-sale	191,203	0
Fair Value, Measurements, Recurring [Member] | U.S. Treasury [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, estimated fair value	258,584	309,417
Fair Value, Measurements, Recurring [Member] | U.S. Treasury [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, estimated fair value	0	0
Fair Value, Measurements, Recurring [Member] | U.S. Treasury [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, estimated fair value	258,584	309,417
Fair Value, Measurements, Recurring [Member] | U.S. Treasury [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, estimated fair value	0	0
Fair Value, Measurements, Recurring [Member] | U.S. Government-Sponsored Enterprises [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, estimated fair value	423,212	391,290
Fair Value, Measurements, Recurring [Member] | U.S. Government-Sponsored Enterprises [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, estimated fair value	0	0
Fair Value, Measurements, Recurring [Member] | U.S. Government-Sponsored Enterprises [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, estimated fair value	423,212	391,290
Fair Value, Measurements, Recurring [Member] | U.S. Government-Sponsored Enterprises [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, estimated fair value	0	0
Fair Value, Measurements, Recurring [Member] | Obligations Of States, Municipalities And Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, estimated fair value	4,428,205	4,013,213
Fair Value, Measurements, Recurring [Member] | Obligations Of States, Municipalities And Political Subdivisions [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, estimated fair value	0	0
Fair Value, Measurements, Recurring [Member] | Obligations Of States, Municipalities And Political Subdivisions [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, estimated fair value	4,428,205	4,013,213
Fair Value, Measurements, Recurring [Member] | Obligations Of States, Municipalities And Political Subdivisions [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, estimated fair value	0	0
Fair Value, Measurements, Recurring [Member] | Foreign Governments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, estimated fair value	1,463,462	1,416,457
Fair Value, Measurements, Recurring [Member] | Foreign Governments [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, estimated fair value	0	0
Fair Value, Measurements, Recurring [Member] | Foreign Governments [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, estimated fair value	1,463,462	1,416,457
Fair Value, Measurements, Recurring [Member] | Foreign Governments [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, estimated fair value	0	0
Fair Value, Measurements, Recurring [Member] | Commercial Mortgage-Backed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, estimated fair value	1,040,356	659,538
Fair Value, Measurements, Recurring [Member] | Commercial Mortgage-Backed [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, estimated fair value	0	0
Fair Value, Measurements, Recurring [Member] | Commercial Mortgage-Backed [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, estimated fair value	1,040,356	659,538
Fair Value, Measurements, Recurring [Member] | Commercial Mortgage-Backed [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, estimated fair value	0	0
Fair Value, Measurements, Recurring [Member] | Residential Mortgage-Backed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, estimated fair value	790,946	854,247
Fair Value, Measurements, Recurring [Member] | Residential Mortgage-Backed [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, estimated fair value	0	0
Fair Value, Measurements, Recurring [Member] | Residential Mortgage-Backed [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, estimated fair value	790,946	854,247
Fair Value, Measurements, Recurring [Member] | Residential Mortgage-Backed [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, estimated fair value	0	0
Fair Value, Measurements, Recurring [Member] | Asset-Backed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, estimated fair value	27,338	36,071
Fair Value, Measurements, Recurring [Member] | Asset-Backed [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, estimated fair value	0	0
Fair Value, Measurements, Recurring [Member] | Asset-Backed [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, estimated fair value	27,338	36,071
Fair Value, Measurements, Recurring [Member] | Asset-Backed [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, estimated fair value	0	0
Fair Value, Measurements, Recurring [Member] | Corporate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, estimated fair value	1,459,407	1,714,235
Fair Value, Measurements, Recurring [Member] | Corporate [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, estimated fair value	0	0
Fair Value, Measurements, Recurring [Member] | Corporate [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, estimated fair value	1,459,407	1,714,235
Fair Value, Measurements, Recurring [Member] | Corporate [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities, estimated fair value	0	0
Fair Value, Measurements, Recurring [Member] | Insurance, Banks And Other Financial Institutions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	1,697,810	1,334,722
Fair Value, Measurements, Recurring [Member] | Insurance, Banks And Other Financial Institutions [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	1,506,607	1,334,722
Fair Value, Measurements, Recurring [Member] | Insurance, Banks And Other Financial Institutions [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	0	0
Fair Value, Measurements, Recurring [Member] | Insurance, Banks And Other Financial Institutions [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	191,203	0
Fair Value, Measurements, Recurring [Member] | Industrial, Consumer And All Other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	3,048,031	2,739,753
Fair Value, Measurements, Recurring [Member] | Industrial, Consumer And All Other [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	3,048,031	2,739,753
Fair Value, Measurements, Recurring [Member] | Industrial, Consumer And All Other [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	0	0
Fair Value, Measurements, Recurring [Member] | Industrial, Consumer And All Other [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	$ 0	$ 0

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Fair Value Measurements (Summary Of Changes In Level 3 Investments Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Equity securities, beginning of period		$ 0	$ 0
Purchases		195,250	0
Sales		(25,000)	0
Total gains included in net income		20,953	0
Total gains included in other comprehensive income (loss)		0	0
Transfers into Level 3		0	0
Transfers out of Level 3		0	0
Equity securities, end of period		191,203	0
Net unrealized gains included in net income relating to assets held at December 31, 2016 and 2015	[1]	$ 20,953	$ 0

[1] Included in net realized investment gains in the consolidated statements of income and comprehensive income.

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Reinsurance (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($) reinsurer	Dec. 31, 2015 USD ($) reinsurer	Dec. 31, 2014 USD ($)
Reinsurance Disclosures [Line Items]
Number of largest company reinsurers | reinsurer	10	10
Reinsurance recoverables | $	$ 362.0	$ 330.7	$ 423.1
Percentage of ceded earned premiums to gross earned premiums	17.00%	18.00%	19.00%
Percentage of assumed earned premiums to net earned premiums	30.00%	31.00%	34.00%
Ten Largest Reinsurers [Member]
Reinsurance Disclosures [Line Items]
Recoverable balances as a percentage of the total balance	67.00%	68.00%
Fairfax Financial Group [Member]
Reinsurance Disclosures [Line Items]
Recoverable balances as a percentage of the total balance	15.00%

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Reinsurance (Reinsurance Allowance For Doubtful Accounts) (Details) - Allowance For Reinsurance Recoverable [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Valuation and Qualifying Accounts Disclosure [Line Items]
Reinsurance allowance, beginning of year	$ 59,350	$ 59,813	$ 76,210
Additions	980	5,897	10,316
Deductions	(23,560)	(6,360)	(26,713)
Reinsurance allowance, end of year	$ 36,770	$ 59,350	$ 59,813

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Reinsurance (Effect Of Reinsurance And Retrocessional Reinsurance On Premiums Written And Earned) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reinsurance Disclosures [Abstract]
Direct premiums written	$ 3,560,635	$ 3,474,510	$ 3,478,273
Direct premiums earned	3,506,687	3,480,297	3,443,912
Assumed premiums written	1,236,010	1,158,402	1,327,240
Assumed premiums earned	1,176,205	1,194,772	1,298,371
Ceded premiums written	(795,625)	(813,619)	(888,498)
Ceded premiums earned	(817,022)	(851,537)	(901,371)
Net premiums written	4,001,020	3,819,293	3,917,015
Net premiums earned	$ 3,865,870	$ 3,823,532	$ 3,840,912

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Commitments And Contingencies (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Maximum remaining term of noncancelable operating leases	18 years
Rental expense	$ 40.2	$ 44.3	$ 42.7

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Commitments And Contingencies (Minimum Annual Rental Commitments) (Details) $ in Thousands	Dec. 31, 2016 USD ($)
Commitments and Contingencies Disclosure [Abstract]
2017	$ 34,449
2018	31,883
2019	29,270
2020	21,536
2021	21,140
2022 and thereafter	95,979
Total	$ 234,257

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Variable Interest Entities (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Variable Interest Entity [Line Items]
Investment management fees earned by the Company from unconsolidated Funds	$ 1,307,779	$ 1,086,758	$ 883,525
Total investment and insurance assets under management of MCIM for unconsolidated VIEs	3,400,000
Other Fund [Member]
Variable Interest Entity [Line Items]
Investment in one of the unconsolidated funds	26,100
Markel Diversified Fund [Member]
Variable Interest Entity [Line Items]
Investment in one of the unconsolidated funds	165,100
Total assets of the Markel Diversified Fund	166,800
Total liabilities of the Markel Diversified Fund	$ 64,600
Percentage of total assets of the Markel Diversified Fund invested in one of the unconsolidated Funds	6.00%
Note payable included in total liabilities of the Markel Diversified Fund delivered as part of the consideration provided for its investment	$ 62,500
Non-Insurance Operations [Member]
Variable Interest Entity [Line Items]
Investment management fees earned by the Company from unconsolidated Funds	1,293,185	1,074,427	854,893
Non-Insurance Operations [Member] | Investment Management [Member]
Variable Interest Entity [Line Items]
Investment management fees earned by the Company from unconsolidated Funds	$ 56,455	$ 0	$ 0

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Statutory Financial Information (Narrative) (Details) $ in Millions	Dec. 31, 2016 USD ($)
Statutory Accounting Practices [Line Items]
Amount of cash and investments held as funds at Lloyd's	$ 784.9
United States [Member]
Statutory Accounting Practices [Line Items]
Amount available for dividend payment	330.4
Bermuda [Member]
Statutory Accounting Practices [Line Items]
Amount available for dividend payment	$ 547.4

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Statutory Financial Information (Actual Statutory Capital And Surplus) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
United States [Member]
Statutory Accounting Practices [Line Items]
Actual statutory capital and surplus	$ 2,761,454	$ 2,569,928
United Kingdom [Member]
Statutory Accounting Practices [Line Items]
Actual statutory capital and surplus	682,477	603,238
Bermuda [Member]
Statutory Accounting Practices [Line Items]
Actual statutory capital and surplus	2,189,649	1,964,844
Other Countries [Member]
Statutory Accounting Practices [Line Items]
Actual statutory capital and surplus	$ 24,726	$ 17,305

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Statutory Financial Information (Statutory Net Income (Loss)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
United States [Member]
Statutory Accounting Practices [Line Items]
Statutory net income (loss)	$ 249,176	$ 291,783	$ 212,909
United Kingdom [Member]
Statutory Accounting Practices [Line Items]
Statutory net income (loss)	77,909	74,330	73,697
Bermuda [Member]
Statutory Accounting Practices [Line Items]
Statutory net income (loss)	132,442	185,289	110,401
Other Countries [Member]
Statutory Accounting Practices [Line Items]
Statutory net income (loss)	$ (891)	$ (3,181)	$ 1,367

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Segment Reporting Disclosures (Narrative) (Details) - segment	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenue, Major Customer [Line Items]
Number of reportable ongoing underwriting segments	3
Percentage of gross premiums written	100.00%	100.00%	100.00%
Top Three Independent Brokers [Member]
Revenue, Major Customer [Line Items]
Percentage of gross premiums written	28.00%	27.00%	28.00%
Top Three Independent Brokers [Member] | International Insurance [Member]
Revenue, Major Customer [Line Items]
Percentage of gross premiums written	40.00%	42.00%	41.00%
Top Three Independent Brokers [Member] | Reinsurance [Member]
Revenue, Major Customer [Line Items]
Percentage of gross premiums written	75.00%	68.00%	68.00%

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Segment Reporting Disclosures (Summary Of Gross Written Premiums By Country) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Gross written premiums	$ 4,796,645	$ 4,632,912	$ 4,805,513
Percentage of gross premiums written	100.00%	100.00%	100.00%
United States [Member]
Segment Reporting Information [Line Items]
Gross written premiums	$ 3,691,840	$ 3,519,487	$ 3,523,239
Percentage of gross premiums written	77.00%	76.00%	73.00%
United Kingdom [Member]
Segment Reporting Information [Line Items]
Gross written premiums	$ 358,348	$ 414,941	$ 441,669
Percentage of gross premiums written	7.00%	9.00%	9.00%
Canada [Member]
Segment Reporting Information [Line Items]
Gross written premiums	$ 125,444	$ 115,191	$ 125,617
Percentage of gross premiums written	3.00%	2.00%	3.00%
Other Countries [Member]
Segment Reporting Information [Line Items]
Gross written premiums	$ 621,013	$ 583,293	$ 714,988
Percentage of gross premiums written	13.00%	13.00%	15.00%

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Segment Reporting Disclosures (Company's Segment Disclosures) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Gross premium volume		$ 4,796,645	$ 4,632,912	$ 4,805,513
Net written premiums		4,001,020	3,819,293	3,917,015
Earned premiums		3,865,870	3,823,532	3,840,912
Losses and loss adjustment expenses, current accident year		(2,555,902)	(2,566,545)	(2,638,012)
Losses and loss adjustment expenses, prior accident years		505,158	627,800	435,545
Amortization of policy acquisition costs		(782,221)	(744,964)	(654,916)
Other operating expenses		(716,369)	(710,116)	(805,966)
Underwriting profit (loss)		316,536	429,707	177,563
Net investment income		373,230	353,213	363,230
Net realized investment gains		65,147	106,480	46,000
Other revenues (insurance)		14,594	12,331	28,632
Other expenses (insurance)		(47,623)	(40,095)	(62,834)
Segment profit (loss)		721,884	861,636	552,591
Other revenues (non-insurance)		1,293,185	1,074,427	854,893
Other expenses (non-insurance)		(1,142,620)	(1,006,710)	(792,037)
Amortization of intangible assets		(68,533)	(68,947)	(57,627)
Interest expense		(129,896)	(118,301)	(117,442)
Loss on early extinguishment of debt		(44,100)	0	0
Income Before Income Taxes		$ 629,920	$ 742,105	$ 440,378
U.S. GAAP combined ratio	[1]	92.00%	89.00%	95.00%
U.S. Insurance [Member]
Segment Reporting Information [Line Items]
Gross premium volume		$ 2,635,266	$ 2,504,096	$ 2,493,823
Net written premiums		2,237,163	2,106,490	2,071,466
Earned premiums		2,175,332	2,105,212	2,022,860
Losses and loss adjustment expenses, current accident year		(1,403,589)	(1,367,159)	(1,340,129)
Losses and loss adjustment expenses, prior accident years		204,881	298,967	216,557
Amortization of policy acquisition costs		(446,649)	(420,289)	(403,233)
Other operating expenses		(377,230)	(378,563)	(396,737)
Underwriting profit (loss)		152,745	238,168	99,318
Net investment income		0	0	0
Net realized investment gains		0	0	0
Other revenues (insurance)		7,143	3,331	2,478
Other expenses (insurance)		(15,407)	(3,902)	(5,149)
Segment profit (loss)		$ 144,481	$ 237,597	$ 96,647
U.S. GAAP combined ratio	[1]	93.00%	89.00%	95.00%
International Insurance [Member]
Segment Reporting Information [Line Items]
Gross premium volume		$ 1,119,815	$ 1,164,866	$ 1,200,403
Net written premiums		864,494	888,214	889,336
Earned premiums		853,512	879,426	909,679
Losses and loss adjustment expenses, current accident year		(605,837)	(638,144)	(660,409)
Losses and loss adjustment expenses, prior accident years		164,713	248,834	166,615
Amortization of policy acquisition costs		(146,117)	(142,657)	(141,394)
Other operating expenses		(219,066)	(221,758)	(207,175)
Underwriting profit (loss)		47,205	125,701	67,316
Net investment income		0	0	0
Net realized investment gains		0	0	0
Other revenues (insurance)		5,560	7,790	21,827
Other expenses (insurance)		(5,712)	(5,717)	(18,706)
Segment profit (loss)		$ 47,053	$ 127,774	$ 70,437
U.S. GAAP combined ratio	[1]	94.00%	86.00%	93.00%
Reinsurance [Member]
Segment Reporting Information [Line Items]
Gross premium volume		$ 1,041,055	$ 965,374	$ 1,112,728
Net written premiums		898,728	824,324	956,584
Earned premiums		836,264	838,543	908,385
Losses and loss adjustment expenses, current accident year		(546,476)	(561,242)	(637,474)
Losses and loss adjustment expenses, prior accident years		125,514	97,860	79,951
Amortization of policy acquisition costs		(189,455)	(182,018)	(110,289)
Other operating expenses		(119,012)	(106,863)	(201,673)
Underwriting profit (loss)		106,835	86,280	38,900
Net investment income		0	0	0
Net realized investment gains		0	0	0
Other revenues (insurance)		0	593	2,696
Other expenses (insurance)		0	(1,419)	(1,847)
Segment profit (loss)		$ 106,835	$ 85,454	$ 39,749
U.S. GAAP combined ratio	[1]	87.00%	90.00%	96.00%
Other Insurance (Discontinued Lines) [Member]
Segment Reporting Information [Line Items]
Gross premium volume		$ 509	$ (1,424)	$ (1,441)
Net written premiums		635	265	(371)
Earned premiums		762	351	(12)
Losses and loss adjustment expenses, current accident year		0	0	0
Losses and loss adjustment expenses, prior accident years		10,050	(17,861)	(27,578)
Amortization of policy acquisition costs		0	0	0
Other operating expenses		(1,061)	(2,932)	(381)
Underwriting profit (loss)		9,751	(20,442)	(27,971)
Net investment income		0	0	0
Net realized investment gains		0	0	0
Other revenues (insurance)		1,891	617	1,631
Other expenses (insurance)		(26,504)	(29,057)	(37,132)
Segment profit (loss)		$ (14,862)	$ (48,882)	$ (63,472)
U.S. GAAP combined ratio - not meaniningful	[1],[2]	NM	NM	NM
Investing [Member]
Segment Reporting Information [Line Items]
Gross premium volume		$ 0	$ 0	$ 0
Net written premiums		0	0	0
Earned premiums		0	0	0
Losses and loss adjustment expenses, current accident year		0	0	0
Losses and loss adjustment expenses, prior accident years		0	0	0
Amortization of policy acquisition costs		0	0	0
Other operating expenses		0	0	0
Underwriting profit (loss)		0	0	0
Net investment income		373,230	353,213	363,230
Net realized investment gains		65,147	106,480	46,000
Other revenues (insurance)		0	0	0
Other expenses (insurance)		0	0	0
Segment profit (loss)		$ 438,377	$ 459,693	$ 409,230

[1] The U.S. GAAP combined ratio is a measure of underwriting performance and represents the relationship of incurred losses, loss adjustment expenses and underwriting, acquisition and insurance expenses to earned premiums.

[2] NM — Ratio is not meaningful

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Segment Reporting Disclosures (Summary Of Deferred Policy Acquisition Costs, Unearned Premiums And Unpaid Losses And Loss Adjustment Expenses) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Deferred policy acquisition costs	$ 392,410	$ 352,756	$ 353,410	$ 260,967
Unearned premiums	2,263,838	2,166,105
Unpaid losses and loss adjustment expenses	10,115,662	10,251,953	$ 10,404,152
U.S. Insurance [Member]
Segment Reporting Information [Line Items]
Deferred policy acquisition costs	176,348	162,289
Unearned premiums	1,166,914	1,105,456
Unpaid losses and loss adjustment expenses	3,849,541	3,720,429
International Insurance [Member]
Segment Reporting Information [Line Items]
Deferred policy acquisition costs	51,948	48,913
Unearned premiums	445,183	467,158
Unpaid losses and loss adjustment expenses	3,062,725	3,140,000
Reinsurance [Member]
Segment Reporting Information [Line Items]
Deferred policy acquisition costs	164,114	141,554
Unearned premiums	651,741	593,491
Unpaid losses and loss adjustment expenses	2,661,209	2,750,258
Other Insurance (Discontinued Lines) [Member]
Segment Reporting Information [Line Items]
Deferred policy acquisition costs	0	0
Unearned premiums	0	0
Unpaid losses and loss adjustment expenses	$ 542,187	$ 641,266

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Segment Reporting Disclosures (Summary Of Segment Earned Premiums By Product) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Earned premiums	$ 3,865,870	$ 3,823,532	$ 3,840,912
U.S. Insurance [Member]
Segment Reporting Information [Line Items]
Earned premiums	2,175,332	2,105,212	2,022,860
U.S. Insurance [Member] | General Liability [Member]
Segment Reporting Information [Line Items]
Earned premiums	563,908	522,358	491,645
U.S. Insurance [Member] | Professional Liability [Member]
Segment Reporting Information [Line Items]
Earned premiums	328,597	324,230	321,005
U.S. Insurance [Member] | Property [Member]
Segment Reporting Information [Line Items]
Earned premiums	270,026	264,232	266,019
U.S. Insurance [Member] | Personal Lines [Member]
Segment Reporting Information [Line Items]
Earned premiums	364,843	325,811	299,442
U.S. Insurance [Member] | Programs [Member]
Segment Reporting Information [Line Items]
Earned premiums	263,783	277,829	244,216
U.S. Insurance [Member] | Workers' Compensation [Member]
Segment Reporting Information [Line Items]
Earned premiums	301,126	281,954	263,164
U.S. Insurance [Member] | Other Products [Member]
Segment Reporting Information [Line Items]
Earned premiums	83,049	108,798	137,369
International Insurance [Member]
Segment Reporting Information [Line Items]
Earned premiums	853,512	879,426	909,679
International Insurance [Member] | General Liability [Member]
Segment Reporting Information [Line Items]
Earned premiums	111,291	124,198	146,178
International Insurance [Member] | Professional Liability [Member]
Segment Reporting Information [Line Items]
Earned premiums	272,010	268,637	285,300
International Insurance [Member] | Property [Member]
Segment Reporting Information [Line Items]
Earned premiums	87,294	85,152	76,691
International Insurance [Member] | Marine And Energy [Member]
Segment Reporting Information [Line Items]
Earned premiums	242,070	262,307	287,263
International Insurance [Member] | Other Products [Member]
Segment Reporting Information [Line Items]
Earned premiums	140,847	139,132	114,247
Reinsurance [Member]
Segment Reporting Information [Line Items]
Earned premiums	836,264	838,543	908,385
Reinsurance [Member] | Property [Member]
Segment Reporting Information [Line Items]
Earned premiums	288,771	265,373	270,461
Reinsurance [Member] | Casualty [Member]
Segment Reporting Information [Line Items]
Earned premiums	327,383	315,027	323,390
Reinsurance [Member] | Auto [Member]
Segment Reporting Information [Line Items]
Earned premiums	65,363	102,227	152,645
Reinsurance [Member] | Other Products [Member]
Segment Reporting Information [Line Items]
Earned premiums	154,747	155,916	161,889
Other Insurance (Discontinued Lines) [Member]
Segment Reporting Information [Line Items]
Earned premiums	$ 762	$ 351	$ (12)

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Segment Reporting Disclosures (Reconciliation Of Segment Assets To The Company's Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Assets	$ 25,875,299	$ 24,939,115	$ 25,197,760
Non-Insurance Operations [Member]
Segment Reporting Information [Line Items]
Assets	1,448,019	1,497,042	1,245,986
Segment Assets [Member]
Segment Reporting Information [Line Items]
Assets	24,427,280	23,442,073	23,951,774
Segment Assets [Member] | Investing [Member]
Segment Reporting Information [Line Items]
Assets	19,029,584	18,056,947	18,531,150
Segment Assets [Member] | Underwriting [Member]
Segment Reporting Information [Line Items]
Assets	$ 5,397,696	$ 5,385,126	$ 5,420,624

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Other Revenues And Other Expenses (Summary Of Other Revenues And Other Expenses By Component) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Other Revenues and Other Expenses [Line Items]
Other revenues	$ 1,307,779	$ 1,086,758	$ 883,525
Other expenses	1,190,243	1,046,805	854,871
Insurance Operations [Member]
Other Revenues and Other Expenses [Line Items]
Other revenues	14,594	12,331	28,632
Other expenses	47,623	40,095	62,834
Non-Insurance Operations [Member]
Other Revenues and Other Expenses [Line Items]
Other revenues	1,293,185	1,074,427	854,893
Other expenses	1,142,620	1,006,710	792,037
Managing General Agent Operations [Member] | Insurance Operations [Member]
Other Revenues and Other Expenses [Line Items]
Other revenues	12,703	10,202	23,324
Other expenses	21,119	9,619	22,527
Life And Annuity [Member] | Insurance Operations [Member]
Other Revenues and Other Expenses [Line Items]
Other revenues	1,891	617	1,631
Other expenses	26,504	29,057	37,132
Other Insurance [Member] | Insurance Operations [Member]
Other Revenues and Other Expenses [Line Items]
Other revenues	0	1,512	3,677
Other expenses	0	1,419	3,175
Manufacturing [Member] | Non-Insurance Operations [Member] | Markel Ventures Operations [Member]
Other Revenues and Other Expenses [Line Items]
Other revenues	784,745	755,802	575,353
Other expenses	675,620	677,054	513,668
Non-Manufacturing [Member] | Non-Insurance Operations [Member] | Markel Ventures Operations [Member]
Other Revenues and Other Expenses [Line Items]
Other revenues	429,704	291,714	262,767
Other expenses	396,323	301,004	261,551
Investment Management [Member] | Non-Insurance Operations [Member]
Other Revenues and Other Expenses [Line Items]
Other revenues	56,455	0	0
Other expenses	46,190	0	0
Other Non-Insurance [Member] | Non-Insurance Operations [Member]
Other Revenues and Other Expenses [Line Items]
Other revenues	22,281	26,911	16,773
Other expenses	$ 24,487	$ 28,652	$ 16,818

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Employee Benefit Plans (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($) funds fund	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Expenses relating to defined contribution plans	$ 30.1	$ 27.7	$ 27.2
Consecutive number of years	3 years
Number of years preceding retirement	10 years
Amortization of the net actuarial pension loss included as a component of accumulated other comprehensive income	$ 3.5
Percentage of equity securities invested in UK companies	30.00%
Percentage of equity securities invested in other markets	70.00%
Number of fixed maturity mutual funds | funds	5
Accumulated benefit obligation	$ 175.1	$ 164.8
Expected plan contributions in 2017	3.2
Expected benefits to be paid in 2017	3.0
Expected benefits to be paid in 2018	3.1
Expected benefits to be paid in 2019	3.1
Expected benefits to be paid in 2020	3.2
Expected benefits to be paid in 2021	3.3
Aggregate benefits expected to be paid from 2022 to 2026	$ 17.4
United Kingdom [Member] | Foreign Governments [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of fixed maturity mutual funds | funds	2
United Kingdom [Member] | Corporate Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of fixed maturity mutual funds | funds	1
Other Foreign Governments [Member] | Foreign Governments [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of fixed maturity mutual funds | funds	1
United Kingdom And Other Foreign Governments [Member] | Corporate Bond Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of fixed maturity mutual funds | fund	1
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation, percent	47.00%
Actual asset allocation, percent	41.00%	43.00%
Fixed Maturity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation, percent	53.00%
Actual asset allocation, percent	59.00%	57.00%

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Employee Benefit Plans (Schedule Of Amounts Recognized On The Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation at beginning of period	$ 170,005	$ 185,556
Interest cost	6,113	6,645	$ 7,572
Plan settlements	0	(2,863)
Benefits paid	(3,322)	(3,970)
Actuarial loss (gain)	38,485	(6,051)
Effect of foreign currency rate changes	(32,663)	(9,312)
Projected benefit obligation at end of year	178,618	170,005	185,556
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of period	186,727	201,399
Actual gain on plan assets	22,367	2,246
Employer contributions	3,577	0
Plan settlements	0	(2,766)
Benefits paid	(3,322)	(3,970)
Effect of foreign currency rate changes	(33,705)	(10,182)
Fair value of plan assets at end of year	175,644	186,727	$ 201,399
Funded status of the plan	(2,974)	16,722
Net actuarial pension loss	85,110	61,818
Total	$ 82,136	$ 78,540

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Employee Benefit Plans (Schedule of Defined Benefit Plan Amounts Recognized in Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Tax benefit	$ 4,192	$ 88	$ 3,687
Total other comprehensive income (loss)	211,358	(350,049)	614,752
Net Actuarial Pension Loss [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	(25,243)	(3,102)	(20,521)
Settlement loss recognized	0	343	0
Amortization of net actuarial loss	1,951	2,319	1,589
Amortization of prior service costs	0	0	495
Tax benefit	4,192	88	3,687
Total other comprehensive income (loss)	$ (19,100)	$ (352)	$ (14,750)

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Employee Benefit Plans (Schedule Of Net Periodic Benefit Income And Weighted Average Assumptions) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Interest cost	$ 6,113	$ 6,645	$ 7,572
Expected return on plan assets	(9,124)	(11,496)	(12,812)
Amortization of prior service cost	0	0	495
Amortization of net actuarial pension loss	1,951	2,319	1,589
Settlement loss recognized	0	343	0
Net periodic benefit income	$ (1,060)	$ (2,189)	$ (3,156)
Discount rate	2.70%	4.00%	3.80%
Expected return on plan assets, percent	4.50%	5.40%	6.00%
Rate of compensation increase	3.00%	2.90%	2.90%

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Employee Benefit Plans (Summary Of Fair Value Of Plan Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 175,644	$ 186,727	$ 201,399
Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets	175,644	186,727
Level 1 [Member] | Fixed Maturity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets	103,218	107,033
Level 1 [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets	72,419	79,686
Level 1 [Member] | Cash And Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 7	$ 8

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Markel Corporation (Parent Company Only) Financial Information (Schedule Of Condensed Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Fixed maturities	$ 9,891,510	$ 9,394,468
Equity securities	4,745,841	4,074,475
Short-term investments (estimated fair value approximates cost)	2,336,151	1,642,261
Total Investments	16,973,502	15,111,204
Cash and cash equivalents	1,738,747	2,630,009	$ 1,960,169	$ 1,978,526
Restricted cash and cash equivalents	346,417	440,132
Other assets	946,024	941,945
Total Assets	25,875,299	24,939,115	25,197,760
Net deferred tax liability	330,485	176,188
Other liabilities	1,099,200	1,030,023
Total Liabilities	17,334,210	17,035,548
Total Shareholders' Equity	8,460,927	7,834,150
Total Liabilities and Equity	25,875,299	24,939,115
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Fixed maturities	52,234	36,618
Equity securities	367,156	311,405
Short-term investments (estimated fair value approximates cost)	1,729,400	755,619
Total Investments	2,148,790	1,103,642
Cash and cash equivalents	369,641	460,271	$ 243,702	$ 207,352
Restricted cash and cash equivalents	1,013	670
Receivables	20,477	17,200
Investments in consolidated subsidiaries	8,107,450	7,961,315
Notes receivable from subsidiaries	60,110	212,636
Other assets	97,364	89,747
Total Assets	10,804,845	9,845,481
Senior long-term debt	1,944,171	1,633,068
Notes payable to subsidiaries	285,000	300,000
Income taxes payable	25,240	4,262
Net deferred tax liability	25,902	7,498
Other liabilities	63,605	66,503
Total Liabilities	2,343,918	2,011,331
Total Shareholders' Equity	8,460,927	7,834,150
Total Liabilities and Equity	$ 10,804,845	$ 9,845,481

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Markel Corporation (Parent Company Only) Financial Information (Schedule of Condensed Balance Sheets - Parenthetical) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items]
Fixed maturities, amortized cost	$ 9,591,734	$ 9,038,158
Equity securities, cost	2,481,448	2,208,834
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Fixed maturities, amortized cost	51,181	35,475
Equity securities, cost	$ 203,708	$ 204,289

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Markel Corporation (Parent Company Only) Financial Information (Schedule Of Condensed Statements Of Income And Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items]
Net investment income													$ 373,230	$ 353,213	$ 363,230
Other-than-temporary impairment losses													(18,355)	(44,481)	(4,784)
Net realized investment gains, excluding other-than-temporary impairment losses													83,502	150,961	50,784
Net realized investment gains													65,147	106,480	46,000
Total Operating Revenues	$ 1,428,625	$ 1,431,282	$ 1,375,937	$ 1,376,182	$ 1,420,460	$ 1,342,764	$ 1,304,605	$ 1,302,154	$ 1,335,755	$ 1,299,286	$ 1,258,971	$ 1,239,655	5,612,026	5,369,983	5,133,667
Interest expense													129,896	118,301	117,442
Loss on early extinguishment of debt													44,100	0	0
Other expenses													1,190,243	1,046,805	854,871
Total Operating Expenses													4,808,110	4,509,577	4,575,847
Income tax benefit													169,477	152,963	116,690
Net Income to Shareholders	132,726	83,796	78,797	160,370	197,892	102,519	91,369	190,992	117,595	75,803	40,068	87,716	455,689	582,772	321,182
Net holding gains (losses) arising during the period													275,661	(240,170)	687,735
Reclassification adjustments for net gains included in net income to shareholders													(33,528)	(80,482)	(26,161)
Change in net unrealized gains on investments, net of taxes													242,168	(320,492)	661,747
Change in foreign currency translation adjustments, net of taxes													(11,704)	(29,278)	(32,241)
Total Other Comprehensive Income (Loss)													211,364	(350,122)	614,756
Comprehensive Income to Shareholders	$ (29,050)	$ 89,161	$ 209,942	$ 396,994	$ 134,984	$ (51,143)	$ (132,925)	$ 281,807	$ 418,571	$ 36,502	$ 250,588	$ 230,273	667,047	232,723	935,934
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Net investment income													9,561	2,565	5,354
Dividends on common stock of consolidated subsidiaries													349,622	187,496	217,121
Other-than-temporary impairment losses													(98)	(3,455)	(120)
Net realized investment gains, excluding other-than-temporary impairment losses													1,166	75,000	3,873
Net realized investment gains													1,068	71,545	3,753
Total Operating Revenues													360,251	261,606	226,228
Interest expense													116,013	95,620	94,097
Loss on early extinguishment of debt													44,100	0	0
Other expenses													13,076	11,287	2,685
Total Operating Expenses													173,189	106,907	96,782
Income Before Equity in Undistributed Earnings of Consolidated Subsidiaries and Income Taxes													187,062	154,699	129,446
Equity in undistributed earnings of consolidated subsidiaries													196,615	407,489	163,341
Income tax benefit													(72,012)	(20,584)	(28,395)
Net Income to Shareholders													455,689	582,772	321,182
Net holding gains (losses) arising during the period													37,045	(41,861)	32,118
Consolidated subsidiaries' net holding gains (losses) arising during the period													238,616	(198,309)	655,617
Consolidated subsidiaries' change in unrealized other-than-temporary impairment losses on fixed maturities arising during the period													35	160	173
Reclassification adjustments for net gains included in net income to shareholders													(558)	(45,273)	(1,874)
Consolidated subsidiaries' reclassification adjustments for net gains included in net income to shareholders													(32,970)	(35,209)	(24,287)
Change in net unrealized gains on investments, net of taxes													242,168	(320,492)	661,747
Change in foreign currency translation adjustments, net of taxes													(1,326)	2,970	1,949
Consolidated subsidiaries' change in foreign currency translation adjustments, net of taxes													(10,384)	(32,175)	(34,194)
Consolidated subsidiaries' change in net actuarial pension loss, net of taxes													(19,100)	(352)	(14,750)
Total Other Comprehensive Income (Loss)													211,358	(350,049)	614,752
Comprehensive Income to Shareholders													$ 667,047	$ 232,723	$ 935,934

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Markel Corporation (Parent Company Only) Financial Information (Schedule Of Condensed Statements Of Cash Flows) (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items]
Net income to shareholders	$ 132,726	$ 83,796	$ 78,797	$ 160,370	$ 197,892	$ 102,519	$ 91,369	$ 190,992	$ 117,595	$ 75,803	$ 40,068	$ 87,716	$ 455,689	$ 582,772	$ 321,182
Net Cash Provided By Operating Activities													534,623	651,151	716,792
Proceeds from sales of fixed maturities and equity securities													365,822	538,978	1,286,871
Proceeds from maturities, calls and prepayments of fixed maturities													963,165	1,503,616	1,420,817
Cost of fixed maturities and equity securities purchased													(2,205,939)	(1,576,254)	(3,153,055)
Net change in short-term investments													(689,194)	(62,124)	(129,164)
Cost of equity method investments													(8,576)	(21,849)	(16,081)
Change in restricted cash and cash equivalents													93,370	62,324	264,701
Additions to property and equipment													(63,674)	(79,755)	(82,132)
Other													(1,348)	(797)	(2,368)
Net Cash Provided (Used) By Investing Activities													(1,545,111)	125,773	(622,205)
Additions to senior long-term debt													559,300	69,797	89,480
Premiums and fees related to early extinguishment of debt													(43,691)	0	0
Repurchases of common stock													(51,142)	(31,491)	(26,053)
Issuance of common stock													4,623	4,752	5,691
Other													(15,373)	(1,225)	(18,591)
Net Cash Provided (Used) By Financing Activities													152,019	(74,211)	(67,124)
Increase (decrease) in cash and cash equivalents													(891,262)	669,840	(18,357)
Cash and cash equivalents at beginning of year				2,630,009				1,960,169				1,978,526	2,630,009	1,960,169	1,978,526
CASH AND CASH EQUIVALENTS AT END OF YEAR	1,738,747				2,630,009				1,960,169				1,738,747	2,630,009	1,960,169
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Net income to shareholders													455,689	582,772	321,182
Adjustments to reconcile net income to shareholders to net cash provided by operating activities													(120,564)	(464,193)	(218,396)
Net Cash Provided By Operating Activities													335,125	118,579	102,786
Proceeds from sales of fixed maturities and equity securities													1,831	100,633	9,306
Proceeds from maturities, calls and prepayments of fixed maturities													11,960	24,945	15,710
Cost of fixed maturities and equity securities purchased													(29,110)	(55,656)	(687)
Net change in short-term investments													(970,364)	9,956	(109,728)
Securities received from subsidiaries as dividends, repayment of notes receivable and return of capital													238,975	0	89,996
Return of capital from subsidiaries													21,021	0	0
Decrease in notes receivable due from subsidiaries													92,530	0	28,506
Capital contributions to subsidiaries													0	(228,578)	(74,788)
Cost of equity method investments													(3,100)	(13,164)	0
Change in restricted cash and cash equivalents													(343)	289	51
Additions to property and equipment													(584)	(305)	(342)
Other													(3,207)	(376)	(2,150)
Net Cash Provided (Used) By Investing Activities													(640,391)	(162,256)	(44,126)
Additions to senior long-term debt													493,149	0	0
Increase in notes payable to subsidiaries													0	285,000	0
Repayment and retirement of senior long-term debt													(183,343)	(2,000)	0
Premiums and fees related to early extinguishment of debt													(43,691)	0	0
Repurchases of common stock													(51,142)	(31,491)	(26,053)
Issuance of common stock													4,623	4,752	5,691
Other													(4,960)	3,985	(1,948)
Net Cash Provided (Used) By Financing Activities													214,636	260,246	(22,310)
Increase (decrease) in cash and cash equivalents													(90,630)	216,569	36,350
Cash and cash equivalents at beginning of year				$ 460,271				$ 243,702				$ 207,352	460,271	243,702	207,352
CASH AND CASH EQUIVALENTS AT END OF YEAR	$ 369,641				$ 460,271				$ 243,702				$ 369,641	$ 460,271	$ 243,702

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Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Operating revenues	$ 1,428,625	$ 1,431,282	$ 1,375,937	$ 1,376,182	$ 1,420,460	$ 1,342,764	$ 1,304,605	$ 1,302,154	$ 1,335,755	$ 1,299,286	$ 1,258,971	$ 1,239,655	$ 5,612,026	$ 5,369,983	$ 5,133,667
Net income	132,703	83,421	80,673	163,646	198,273	104,410	92,453	194,006	118,222	76,824	41,141	87,501	460,443	589,142	323,688
Net income to shareholders	132,726	83,796	78,797	160,370	197,892	102,519	91,369	190,992	117,595	75,803	40,068	87,716	455,689	582,772	321,182
Comprehensive income (loss) to shareholders	$ (29,050)	$ 89,161	$ 209,942	$ 396,994	$ 134,984	$ (51,143)	$ (132,925)	$ 281,807	$ 418,571	$ 36,502	$ 250,588	$ 230,273	$ 667,047	$ 232,723	$ 935,934
Basic net income per share (dollars per share)	$ 9.14	$ 5.62	$ 5.44	$ 11.21	$ 14.23	$ 7.43	$ 6.76	$ 13.57	$ 8.10	$ 5.33	$ 2.67	$ 6.28	$ 31.41	$ 41.99	$ 22.38
Diluted net income per share (dollars per share)	9.11	5.60	5.41	11.15	14.14	7.39	6.72	13.49	8.05	5.30	2.66	6.25	$ 31.27	$ 41.74	$ 22.27
Common stock price, high (dollars per share)	931.94	961.78	989.18	895.03	937.91	898.08	821.00	783.50	707.36	666.00	655.75	596.87
Common stock price, low (dollars per share)	$ 811.05	$ 909.84	$ 880.01	$ 805.03	$ 791.97	$ 775.00	$ 736.96	$ 660.05	$ 632.65	$ 623.90	$ 593.76	$ 527.17