10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

___________________________________________

FORM 10-Q

___________________________________________

x Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the quarterly period ended June 30, 2016

or

¨ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the transition period from _______ to _______

Commission File Number: 001-15811

___________________________________________

MARKEL CORPORATION

(Exact name of registrant as specified in its charter)

___________________________________________

Virginia	54-1959284
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

4521 Highwoods Parkway, Glen Allen, Virginia 23060-6148

(Address of principal executive offices)

(Zip Code)

(804) 747-0136

(Registrant's telephone number, including area code)

___________________________________________

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 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  o Non-accelerated filer  o Smaller reporting company  o

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

Number of shares of the registrant's common stock outstanding at July 26, 2016: 13,990,839

Markel Corporation

Form 10-Q

Index

		Page Number
PART I. FINANCIAL INFORMATION
Item 1.	Financial Statements
	Consolidated Balance Sheets—June 30, 2016 and December 31, 2015	3
	Consolidated Statements of Income and Comprehensive Income (Loss)—Quarters and Six Months Ended June 30, 2016 and 2015	4
	Consolidated Statements of Changes in Equity—Six Months Ended June 30, 2016 and 2015	5
	Condensed Consolidated Statements of Cash Flows—Six Months Ended June 30, 2016 and 2015	6
	Notes to Consolidated Financial Statements	7
Item 2.	Management's Discussion and Analysis of Financial Condition and Results of Operations	29
	Critical Accounting Estimates	29
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	45
Item 4.	Controls and Procedures	46
Safe Harbor and Cautionary Statement		47
PART II. OTHER INFORMATION
Item 1A.	Risk Factors	49
Item 6.	Exhibits	49
Signatures		50
Exhibit Index		51

2

PART I. FINANCIAL INFORMATION

Item 1. Financial Statements

MARKEL CORPORATION AND SUBSIDIARIES

Consolidated Balance Sheets

(dollars in thousands)

	June 30, 2016		December 31, 2015
	(unaudited)
ASSETS
Investments, available-for-sale, at estimated fair value:
Fixed maturities (amortized cost of $9,590,337 in 2016 and $9,038,158 in 2015)	$	10,399,629	$	9,394,468
Equity securities (cost of $2,390,184 in 2016 and $2,208,834 in 2015)	4,395,569		4,074,475
Short-term investments (estimated fair value approximates cost)	1,995,491		1,642,261
Total Investments	16,790,689		15,111,204
Cash and cash equivalents	2,007,938		2,630,009
Restricted cash and cash equivalents	353,900		440,132
Receivables	1,427,092		1,113,703
Reinsurance recoverable on unpaid losses	2,038,687		2,016,665
Reinsurance recoverable on paid losses	57,940		50,123
Deferred policy acquisition costs	415,700		352,756
Prepaid reinsurance premiums	362,865		322,362
Goodwill	1,167,861		1,167,844
Intangible assets	753,191		792,372
Other assets	959,765		941,945
Total Assets	$	26,335,628	$	24,939,115
LIABILITIES AND EQUITY
Unpaid losses and loss adjustment expenses	$	10,199,899	$	10,251,953
Life and annuity benefits	1,152,676		1,123,275
Unearned premiums	2,529,540		2,166,105
Payables to insurance and reinsurance companies	260,599		224,921
Senior long-term debt and other debt (estimated fair value of $2,842,000 in 2016 and $2,403,000 in 2015)	2,602,432		2,239,271
Other liabilities	1,078,708		1,030,023
Total Liabilities	17,823,854		17,035,548
Redeemable noncontrolling interests	66,201		62,958
Commitments and contingencies
Shareholders' equity:
Common stock	3,360,830		3,342,357
Retained earnings	3,355,262		3,137,285
Accumulated other comprehensive income	1,722,277		1,354,508
Total Shareholders' Equity	8,438,369		7,834,150
Noncontrolling interests	7,204		6,459
Total Equity	8,445,573		7,840,609
Total Liabilities and Equity	$	26,335,628	$	24,939,115

See accompanying notes to consolidated financial statements.

3

MARKEL CORPORATION AND SUBSIDIARIES

Consolidated Statements of Income and Comprehensive Income (Loss)

(Unaudited)

	Quarter Ended June 30,						Six Months Ended June 30,
	2016			2015			2016			2015
	(dollars in thousands, except per share data)
OPERATING REVENUES
Earned premiums	$	950,859		$	957,557		$	1,908,545		$	1,901,207
Net investment income	94,996			90,586			186,290			183,461
Net realized investment gains:
Other-than-temporary impairment losses	(3,675		)	—			(12,080		)	(5,092		)
Net realized investment gains, excluding other-than-temporary impairment losses	20,916			6,105			50,500			16,768
Net realized investment gains	17,241			6,105			38,420			11,676
Other revenues	312,841			250,357			618,864			510,415
Total Operating Revenues	1,375,937			1,304,605			2,752,119			2,606,759
OPERATING EXPENSES
Losses and loss adjustment expenses	511,556			536,194			985,520			983,189
Underwriting, acquisition and insurance expenses	375,580			379,652			740,268			720,337
Amortization of intangible assets	17,204			16,949			34,464			31,589
Other expenses	277,909			242,236			553,002			473,237
Total Operating Expenses	1,182,249			1,175,031			2,313,254			2,208,352
Operating Income	193,688			129,574			438,865			398,407
Interest expense	33,697			29,288			64,538			58,600
Loss on early extinguishment of debt	44,100			—			44,100			—
Income Before Income Taxes	115,891			100,286			330,227			339,807
Income tax expense	35,218			7,833			85,908			53,348
Net Income	80,673			92,453			244,319			286,459
Net income attributable to noncontrolling interests	1,876			1,084			5,152			4,098
Net Income to Shareholders	$	78,797		$	91,369		$	239,167		$	282,361
OTHER COMPREHENSIVE INCOME (LOSS)
Change in net unrealized gains on investments, net of taxes:
Net holding gains (losses) arising during the period	$	149,406		$	(230,142	)	$	388,296		$	(109,120	)
Change in unrealized other-than-temporary impairment losses on fixed maturities arising during the period	44			(48		)	(23		)	119
Reclassification adjustments for net gains included in net income	(10,567		)	(4,984		)	(23,550		)	(14,037		)
Change in net unrealized gains on investments, net of taxes	138,883			(235,174		)	364,723			(123,038		)
Change in foreign currency translation adjustments, net of taxes	(8,121		)	10,385			2,208			(11,429		)
Change in net actuarial pension loss, net of taxes	394			469			857			932
Total Other Comprehensive Income (Loss)	131,156			(224,320		)	367,788			(133,535		)
Comprehensive Income (Loss)	211,829			(131,867		)	612,107			152,924
Comprehensive income attributable to noncontrolling interests	1,887			1,058			5,171			4,042
Comprehensive Income (Loss) to Shareholders	$	209,942		$	(132,925	)	$	606,936		$	148,882
NET INCOME PER SHARE
Basic	$	5.44		$	6.76		$	16.65		$	20.33
Diluted	$	5.41		$	6.72		$	16.55		$	20.21

See accompanying notes to consolidated financial statements.

4

MARKEL CORPORATION AND SUBSIDIARIES

Consolidated Statements of Changes in Equity

(Unaudited)

(in thousands)	Common Shares		Common Stock			Retained Earnings			Accumulated Other Comprehensive Income			Total Shareholders' Equity			Noncontrolling Interests			Total Equity			Redeemable Noncontrolling Interests
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						282,361			—			282,361			777			283,138			3,321
Other comprehensive loss						—			(133,479		)	(133,479		)	—			(133,479		)	(56		)
Comprehensive Income												148,882			777			149,659			3,265
Issuance of common stock	15		3,609			—			—			3,609			—			3,609			—
Repurchase of common stock	(27	)	—			(22,670		)	—			(22,670		)	—			(22,670		)	—
Restricted stock units expensed	—		14,968			—			—			14,968			—			14,968			—
Adjustment of redeemable noncontrolling interests	—		—			1,715			—			1,715			—			1,715			(1,715		)
Purchase of noncontrolling interest	—		(1,447		)	—			—			(1,447		)	—			(1,447		)	(8,224		)
Other	—		1,964			31			—			1,995			45			2,040			(2,482		)
June 30, 2015	13,950		$	3,327,489		$	2,843,303		$	1,571,078		$	7,741,870		$	8,006		$	7,749,876		$	51,892
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						239,167			—			239,167			790			239,957			4,362
Other comprehensive income						—			367,769			367,769			—			367,769			19
Comprehensive Income												606,936			790			607,726			4,381
Issuance of common stock	48		4,101			—			—			4,101			—			4,101			—
Repurchase of common stock	(16	)	—			(15,206		)	—			(15,206		)	—			(15,206		)	—
Restricted stock units expensed	—		13,473			—			—			13,473			—			13,473			—
Adjustment of redeemable noncontrolling interests	—		—			(5,981		)	—			(5,981		)	—			(5,981		)	5,981
Purchase of noncontrolling interest	—		899			—			—			899			—			899			(3,977		)
Other	—		—			(3		)	—			(3		)	(45		)	(48		)	(3,142		)
June 30, 2016	13,991		$	3,360,830		$	3,355,262		$	1,722,277		$	8,438,369		$	7,204		$	8,445,573		$	66,201

See accompanying notes to consolidated financial statements.

5

MARKEL CORPORATION AND SUBSIDIARIES

Condensed Consolidated Statements of Cash Flows

(Unaudited)

	Six Months Ended June 30,
	2016			2015
	(dollars in thousands)
OPERATING ACTIVITIES
Net income	$	244,319		$	286,459
Adjustments to reconcile net income to net cash provided by operating activities	(174,105		)	(48,424		)
Net Cash Provided By Operating Activities	70,214			238,035
INVESTING ACTIVITIES
Proceeds from sales of fixed maturities and equity securities	226,492			99,908
Proceeds from maturities, calls and prepayments of fixed maturities	471,907			810,934
Cost of fixed maturities and equity securities purchased	(1,324,755		)	(556,934		)
Net change in short-term investments	(348,335		)	(595,971		)
Proceeds from sales of equity method investments	6,479			21,365
Cost of equity method investments	(1,126		)	(19,424		)
Change in restricted cash and cash equivalents	90,003			(9,748		)
Additions to property and equipment	(34,634		)	(38,942		)
Acquisitions, net of cash acquired	(5,762		)	—
Other	(605		)	489
Net Cash Used By Investing Activities	(920,336		)	(288,323		)
FINANCING ACTIVITIES
Additions to senior long-term debt and other debt	533,235			41,230
Repayment of senior long-term debt and other debt	(228,836		)	(43,044		)
Premiums and fees related to early extinguishment of debt	(43,691		)	—
Repurchases of common stock	(15,206		)	(22,670		)
Issuance of common stock	4,101			3,609
Purchase of noncontrolling interests	(3,078		)	(12,474		)
Distributions to noncontrolling interests	(3,187		)	(2,490		)
Other	(13,428		)	(12,454		)
Net Cash Provided (Used) By Financing Activities	229,910			(48,293		)
Effect of foreign currency rate changes on cash and cash equivalents	(1,859		)	(8,644		)
Decrease in cash and cash equivalents	(622,071		)	(107,225		)
Cash and cash equivalents at beginning of period	2,630,009			1,960,169
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$	2,007,938		$	1,852,944

See accompanying notes to consolidated financial statements.

6

MARKEL CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1. Summary of Significant Accounting Policies

a) Basis of Presentation. 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 and programs. 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.

The consolidated balance sheet as of June 30, 2016, the related consolidated statements of income and comprehensive income (loss) for the quarters and six months ended June 30, 2016 and 2015, and the consolidated statements of changes in equity and cash flows for the six months ended June 30, 2016 and 2015 are unaudited. In the opinion of management, all adjustments necessary for fair presentation of such consolidated financial statements have been included. Such adjustments consist only of normal, recurring items. Interim results are not necessarily indicative of results of operations for the entire year. The consolidated balance sheet as of December 31, 2015 was derived from Markel Corporation's audited annual consolidated financial statements.

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.

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. Actual results may differ materially from the estimates and assumptions used in preparing the consolidated financial statements.

The consolidated financial statements and notes are presented as permitted by Form 10-Q and do not contain certain information included in the Company's annual consolidated financial statements and notes. In addition to the policies set forth below, readers are urged to review the Company's 2015 Annual Report on Form 10-K for a more complete description of the Company's business and accounting policies.

b) Variable Interest Entities. The Company determines whether it has relationships with entities defined as VIEs in accordance with Accounting Standards Codification (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.

7

c) Revenue Recognition.

Investment Management and Performance Fees

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 ASC Topic 605, Revenue Recognition, such performance fee income is recorded at the conclusion of the contractual performance period, when all contingencies are resolved.

2. 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 were reclassified from other assets to senior long-term debt and other debt as of December 31, 2015. 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, 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.

8

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. In August 2015, the FASB issued ASU No. 2015-14, Revenue from Contracts with Customers (Topic 606), Deferral of the Effective Date, which deferred the original effective date of ASU No. 2014-09 by one year. As a result, ASU No. 2014-09 becomes effective for the Company during the first quarter of 2018 and may be applied retrospectively or under a modified retrospective method where the cumulative effect is recognized at the date of initial application. Early application is permitted, but not before the first quarter of 2017. 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 and ASU No. 2016-12, Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients were issued in March, April and May 2016, respectively, as amendments to ASU No. 2014-09. These amendments will be evaluated and adopted in conjunction with ASU No. 2014-09. The Company is currently evaluating ASU No. 2014-09, and the related amendments, to determine the potential impact that adopting this standard will have on its consolidated financial statements. Adoption of this ASU is not expected to have a material impact on the Company's insurance operations, but may have a material impact on the Company's non-insurance operations.

In May 2015, the FASB issued ASU No. 2015-09, Financial Services-Insurance (Topic 944): Disclosures about Short-Duration Contracts. The ASU 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, on a net basis after 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. Interim period disclosures must include a tabular rollforward and related qualitative information for the liability for unpaid losses and loss adjustment expenses. Annual disclosures required by ASU No. 2015-09 become effective for the Company during 2016, with interim disclosures required beginning in the first quarter of 2017. The ASU must be applied retrospectively by providing comparative disclosures for each period presented. Early application is permitted. The adoption of this ASU will not have an impact on the Company's financial position, results of operations or cash flows, but will expand the nature and extent of its insurance contract disclosures, as described above.

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. Early adoption is permitted for certain provisions of the ASU. The Company is currently evaluating ASU No. 2016-01 to determine the potential 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 (loss), but will have a significant impact on the Company's results of operations as changes in fair value will be presented in net income rather than other comprehensive income (loss).

9

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). The ASU requires lessees to put 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 the 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. Early adoption is permitted. The Company is currently evaluating ASU No. 2016-02 to determine the potential impact that adopting this standard will have on the 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, 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.

3. 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. Total consideration for the CapTech acquisition was $60.6 million. As of December 31, 2015, the purchase price was preliminarily allocated to the acquired assets and liabilities based on the estimated fair values at the acquisition date. During the first quarter of 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. Results attributable to this acquisition are included with the Company's non-insurance operations, which are not included in a reportable segment.

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4. Investments

a)The following tables summarize the Company's available-for-sale investments.

	June 30, 2016
(dollars in thousands)	Amortized Cost		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses			Unrealized Other-Than- Temporary Impairment Losses			Estimated Fair Value
Fixed maturities:
U.S. Treasury securities and obligations of U.S. government agencies	$	674,801	$	25,489	$	(9	)	$	—		$	700,281
Obligations of states, municipalities and political subdivisions	4,193,114		370,264		(2,329		)	—			4,561,049
Foreign governments	1,349,640		233,884		(305		)	—			1,583,219
Commercial mortgage-backed securities	975,606		48,531		(533		)	—			1,023,604
Residential mortgage-backed securities	805,631		57,100		(529		)	(2,258		)	859,944
Asset-backed securities	28,232		127		(17		)	—			28,342
Corporate bonds	1,563,313		82,823		(1,293		)	(1,653		)	1,643,190
Total fixed maturities	9,590,337		818,218		(5,015		)	(3,911		)	10,399,629
Equity securities:
Insurance, banks and other financial institutions	835,144		769,505		(12,641		)	—			1,592,008
Industrial, consumer and all other	1,555,040		1,270,474		(21,953		)	—			2,803,561
Total equity securities	2,390,184		2,039,979		(34,594		)	—			4,395,569
Short-term investments	1,995,368		124		(1		)	—			1,995,491
Investments, available-for-sale	$	13,975,889	$	2,858,321	$	(39,610	)	$	(3,911	)	$	16,790,689

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	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 maturities:
U.S. Treasury securities and obligations of U.S. government agencies	$	695,652	$	9,836	$	(4,781	)	$	—		$	700,707
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 securities	657,670		6,867		(4,999		)	—			659,538
Residential mortgage-backed securities	837,964		22,563		(4,022		)	(2,258		)	854,247
Asset-backed securities	36,462		15		(406		)	—			36,071
Corporate bonds	1,690,945		41,123		(16,209		)	(1,624		)	1,714,235
Total fixed maturities	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.

	June 30, 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 maturities:
U.S. Treasury securities and obligations of U.S. government agencies	$	7,537	$	(7	)	$	8,529	$	(2	)	$	16,066	$	(9	)
Obligations of states, municipalities and political subdivisions	2,789		(2		)	47,301		(2,327		)	50,090		(2,329		)
Foreign governments	42,255		(304		)	5,026		(1		)	47,281		(305		)
Commercial mortgage-backed securities	23,518		(142		)	63,738		(391		)	87,256		(533		)
Residential mortgage-backed securities	6,584		(2,304		)	104,340		(483		)	110,924		(2,787		)
Asset-backed securities	—		—			6,316		(17		)	6,316		(17		)
Corporate bonds	37,222		(1,664		)	104,194		(1,282		)	141,416		(2,946		)
Total fixed maturities	119,905		(4,423		)	339,444		(4,503		)	459,349		(8,926		)
Equity securities:
Insurance, banks and other financial institutions	77,737		(12,641		)	—		—			77,737		(12,641		)
Industrial, consumer and all other	191,170		(19,887		)	27,819		(2,066		)	218,989		(21,953		)
Total equity securities	268,907		(32,528		)	27,819		(2,066		)	296,726		(34,594		)
Short-term investments	99,977		(1		)	—		—			99,977		(1		)
Total	$	488,789	$	(36,952	)	$	367,263	$	(6,569	)	$	856,052	$	(43,521	)

At June 30, 2016, the Company held 216 securities with a total estimated fair value of $856.1 million and gross unrealized losses of $43.5 million. Of these 216 securities, 126 securities had been in a continuous unrealized loss position for one year or longer and had a total estimated fair value of $367.3 million and gross unrealized losses of $6.6 million. Of these securities, 119 securities were fixed maturities and seven were equity securities. The Company does not intend to sell or believe it will be required to sell these fixed maturities 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 maturities:
U.S. Treasury securities and obligations of U.S. government agencies	$	427,003	$	(3,648	)	$	92,552	$	(1,133	)	$	519,555	$	(4,781	)
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 securities	289,058		(3,600		)	95,843		(1,399		)	384,901		(4,999		)
Residential mortgage-backed securities	78,814		(2,858		)	137,100		(3,422		)	215,914		(6,280		)
Asset-backed securities	6,228		(54		)	24,315		(352		)	30,543		(406		)
Corporate bonds	470,694		(9,509		)	343,737		(8,324		)	814,431		(17,833		)
Total fixed maturities	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 maturities 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 maturities, 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 maturities 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.

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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 maturities at June 30, 2016 are shown below by contractual maturity.

(dollars in thousands)	Amortized Cost		Estimated Fair Value
Due in one year or less	$	720,305	$	726,444
Due after one year through five years	1,386,900		1,441,314
Due after five years through ten years	1,654,425		1,802,966
Due after ten years	4,019,238		4,517,015
	7,780,868		8,487,739
Commercial mortgage-backed securities	975,606		1,023,604
Residential mortgage-backed securities	805,631		859,944
Asset-backed securities	28,232		28,342
Total fixed maturities	$	9,590,337	$	10,399,629

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

	Quarter Ended June 30,						Six Months Ended June 30,
(dollars in thousands)	2016			2015			2016			2015
Interest:
Municipal bonds (tax-exempt)	$	22,563		$	24,293		$	44,485		$	50,145
Municipal bonds (taxable)	16,222			14,150			32,110			28,250
Other taxable bonds	36,959			34,013			72,278			69,151
Short-term investments, including overnight deposits	2,654			1,116			4,945			2,367
Dividends on equity securities	16,758			18,633			34,410			37,657
Income from equity method investments	3,921			1,712			3,668			3,056
Other	190			479			2,674			540
	99,267			94,396			194,570			191,166
Investment expenses	(4,271		)	(3,810		)	(8,280		)	(7,705		)
Net investment income	$	94,996		$	90,586		$	186,290		$	183,461

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

	Quarter Ended June 30,						Six Months Ended June 30,
(dollars in thousands)	2016			2015			2016			2015
Realized gains:
Sales of fixed maturities	$	699		$	770		$	967		$	2,338
Sales of equity securities	17,798			7,000			45,526			22,956
Other	353			1,739			773			2,413
Total realized gains	18,850			9,509			47,266			27,707
Realized losses:
Sales of fixed maturities	(142		)	(97		)	(555		)	(221		)
Sales of equity securities	(1,780		)	(113		)	(2,498		)	(272		)
Other-than-temporary impairments	(3,675		)	—			(12,080		)	(5,092		)
Other	(718		)	(16		)	(2,996		)	(227		)
Total realized losses	(6,315		)	(226		)	(18,129		)	(5,812		)
Gains (losses) on securities measured at fair value through net income	4,706			(3,178		)	9,283			(10,219		)
Net realized investment gains	$	17,241		$	6,105		$	38,420		$	11,676
Change in net unrealized gains on investments included in other comprehensive income (loss):
Fixed maturities	$	213,026		$	(286,551	)	$	452,982		$	(180,213	)
Equity securities	42,786			(64,792		)	139,744			(6,447		)
Short-term investments	32			11			(35		)	(9		)
Net increase (decrease)	$	255,844		$	(351,332	)	$	592,691		$	(186,669	)

For the quarter ended June 30, 2016, other-than-temporary impairment losses recognized in net income and included in net realized investment gains totaled $3.7 million and were attributable to 12 equity securities. The write downs for the quarter included $3.0 million related to equities in industrial, consumer, or other types of businesses and $0.6 million related to equities in insurance, banks, and other financial institutions. For the six months ended June 30, 2016, other-than-temporary impairment losses recognized in net income and included in net realized investment gains totaled $12.1 million and were attributable to 21 equity securities. The write downs for the six-month period included $10.8 million related to equities in industrial, consumer, or other types of businesses and $1.3 million related to equities in insurance, banks, and other financial institutions. For the six months ended June 30, 2015, other-than-temporary impairment losses recognized in net income and included in net realized investment gains totaled $5.1 million and were attributable to 10 equity securities. The write downs for the six-month period included $4.5 million related to equities in industrial, consumer, or other types of businesses and $0.6 million related to equities in insurance, banks, and other financial institutions.

5. 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.

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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 maturities, 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 maturities 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 and obligations of U.S. government agencies, 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 12, 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.

17

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 and liabilities measured at fair value on a recurring basis by level within the fair value hierarchy.

	June 30, 2016
(dollars in thousands)	Level 1		Level 2		Level 3		Total
Assets:
Investments available-for-sale:
Fixed maturities:
U.S. Treasury securities and obligations of U.S. government agencies	$	—	$	700,281	$	—	$	700,281
Obligations of states, municipalities and political subdivisions	—		4,561,049		—		4,561,049
Foreign governments	—		1,583,219		—		1,583,219
Commercial mortgage-backed securities	—		1,023,604		—		1,023,604
Residential mortgage-backed securities	—		859,944		—		859,944
Asset-backed securities	—		28,342		—		28,342
Corporate bonds	—		1,643,190		—		1,643,190
Total fixed maturities	—		10,399,629		—		10,399,629
Equity securities:
Insurance, banks and other financial institutions	1,408,485		—		183,523		1,592,008
Industrial, consumer and all other	2,803,561		—		—		2,803,561
Total equity securities	4,212,046		—		183,523		4,395,569
Short-term investments	1,877,297		118,194		—		1,995,491
Total investments available-for-sale	$	6,089,343	$	10,517,823	$	183,523	$	16,790,689

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	December 31, 2015
(dollars in thousands)	Level 1		Level 2		Level 3		Total
Assets:
Investments available-for-sale:
Fixed maturities:
U.S. Treasury securities and obligations of U.S. government agencies	$	—	$	700,707	$	—	$	700,707
Obligations of states, municipalities and political subdivisions	—		4,013,213		—		4,013,213
Foreign governments	—		1,416,457		—		1,416,457
Commercial mortgage-backed securities	—		659,538		—		659,538
Residential mortgage-backed securities	—		854,247		—		854,247
Asset-backed securities	—		36,071		—		36,071
Corporate bonds	—		1,714,235		—		1,714,235
Total fixed maturities	—		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.

	Quarter Ended June 30,					Six Months Ended June 30,
(dollars in thousands)	2016			2015		2016			2015
Equity securities, beginning of period	$	176,942		$	—	$	—		$	—
Purchases	25,000			—		195,250			—
Sales	(25,000		)	—		(25,000		)	—
Total gains included in:
Net income	6,581			—		13,273			—
Other comprehensive income (loss)	—			—		—			—
Transfers into Level 3	—			—		—			—
Transfers out of Level 3	—			—		—			—
Equity securities, end of period	$	183,523		$	—	$	183,523		$	—
Net unrealized gains included in net income relating to assets held at June 30, 2016 and 2015 (1)	$	6,581		$	—	$	13,273		$	—

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

There were no transfers into or out of Level 1 and Level 2 during the quarter and six months ended June 30, 2016 and 2015.

The Company did not have any assets or liabilities measured at fair value on a non-recurring basis during the six months ended June 30, 2016 and 2015.

19

6. 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 placements written by the Company's insurance subsidiaries domiciled in the United States. The International Insurance segment includes all direct business and facultative 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 the 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 the Company's 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 Markel CATCo Investment Management Ltd. For purposes of segment reporting, the Company's non-insurance operations are not considered to be a reportable 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.

20

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

	Quarter Ended June 30, 2016
(dollars in thousands)	U.S. Insurance			International Insurance			Reinsurance			Other Insurance (Discontinued Lines)				Investing		Consolidated
Gross premium volume	$	689,468		$	318,581		$	269,604		$	(4	)		$	—	$	1,277,649
Net written premiums	579,233			244,636			226,681			(4		)		—		1,050,546
Earned premiums	533,328			203,052			214,514			(35		)		—		950,859
Losses and loss adjustment expenses:
Current accident year	(352,092		)	(146,453		)	(152,693		)	—				—		(651,238		)
Prior accident years	66,332			39,002			34,644			(296		)		—		139,682
Underwriting, acquisition and insurance expenses	(212,915		)	(96,562		)	(66,143		)	40				—		(375,580		)
Underwriting profit (loss)	34,653			(961		)	30,322			(291		)		—		63,723
Net investment income	—			—			—			—				94,996		94,996
Net realized investment gains	—			—			—			—				17,241		17,241
Other revenues (insurance)	958			609			—			446				—		2,013
Other expenses (insurance)	(684		)	(2,137		)	—			(7,199		)		—		(10,020		)
Segment profit (loss)	$	34,927		$	(2,489	)	$	30,322		$	(7,044	)		$	112,237	$	167,953
Other revenues (non-insurance)																310,828
Other expenses (non-insurance)																(267,889		)
Amortization of intangible assets																(17,204		)
Interest expense																(33,697		)
Loss on early extinguishment of debt																(44,100		)
Income before income taxes																$	115,891
U.S. GAAP combined ratio (1)	94		%	100		%	86		%	NM			(2)			93		%

	Quarter Ended June 30, 2015
(dollars in thousands)	U.S. Insurance			International Insurance			Reinsurance			Other Insurance (Discontinued Lines)				Investing		Consolidated
Gross premium volume	$	668,853		$	338,159		$	258,745		$	29			$	—	$	1,265,786
Net written premiums	554,638			264,129			215,520			57				—		1,034,344
Earned premiums	520,446			223,941			213,140			30				—		957,557
Losses and loss adjustment expenses:
Current accident year	(341,335		)	(168,896		)	(154,623		)	—				—		(664,854		)
Prior accident years	68,620			43,373			15,118			1,549				—		128,660
Underwriting, acquisition and insurance expenses	(211,856		)	(94,617		)	(73,170		)	(9		)		—		(379,652		)
Underwriting profit	35,875			3,801			465			1,570				—		41,711
Net investment income	—			—			—			—				90,586		90,586
Net realized investment gains	—			—			—			—				6,105		6,105
Other revenues (insurance)	2,203			915			469			350				—		3,937
Other expenses (insurance)	(1,284		)	(1,318		)	—			(3,348		)		—		(5,950		)
Segment profit (loss)	$	36,794		$	3,398		$	934		$	(1,428	)		$	96,691	$	136,389
Other revenues (non-insurance)																246,420
Other expenses (non-insurance)																(236,286		)
Amortization of intangible assets																(16,949		)
Interest expense																(29,288		)
Income before income taxes																$	100,286
U.S. GAAP combined ratio (1)	93		%	98		%	100		%	NM			(2)			96		%

⁽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.

21

	Six Months Ended June 30, 2016
(dollars in thousands)	U.S. Insurance			International Insurance			Reinsurance			Other Insurance (Discontinued Lines)				Investing		Consolidated
Gross premium volume	$	1,337,258		$	609,985		$	723,090		$	(21	)		$	—	$	2,670,312
Net written premiums	1,131,978			471,035			629,407			86				—		2,232,506
Earned premiums	1,065,796			418,397			424,133			219				—		1,908,545
Losses and loss adjustment expenses:
Current accident year	(668,425		)	(291,929		)	(283,169		)	—				—		(1,243,523		)
Prior accident years	104,986			68,654			71,005			13,358				—		258,003
Underwriting, acquisition and insurance expenses	(410,378		)	(185,168		)	(144,648		)	(74		)		—		(740,268		)
Underwriting profit	91,979			9,954			67,321			13,503				—		182,757
Net investment income	—			—			—			—				186,290		186,290
Net realized investment gains	—			—			—			—				38,420		38,420
Other revenues (insurance)	2,377			4,730			—			941				—		8,048
Other expenses (insurance)	(1,408		)	(3,691		)	—			(15,200		)		—		(20,299		)
Segment profit (loss)	$	92,948		$	10,993		$	67,321		$	(756	)		$	224,710	$	395,216
Other revenues (non-insurance)																610,816
Other expenses (non-insurance)																(532,703		)
Amortization of intangible assets																(34,464		)
Interest expense																(64,538		)
Loss on early extinguishment of debt																(44,100		)
Income before income taxes																$	330,227
U.S. GAAP combined ratio (1)	91		%	98		%	84		%	NM			(2)			90		%

	Six Months Ended June 30, 2015
(dollars in thousands)	U.S. Insurance			International Insurance			Reinsurance			Other Insurance (Discontinued Lines)				Investing		Consolidated
Gross premium volume	$	1,254,218		$	627,386		$	636,582		$	73			$	—	$	2,518,259
Net written premiums	1,050,807			486,837			531,732			398				—		2,069,774
Earned premiums	1,035,000			429,902			435,894			411				—		1,901,207
Losses and loss adjustment expenses:
Current accident year	(658,092		)	(317,740		)	(303,363		)	—				—		(1,279,195		)
Prior accident years	136,201			120,023			41,505			(1,723		)		—		296,006
Underwriting, acquisition and insurance expenses	(397,116		)	(173,411		)	(149,723		)	(87		)		—		(720,337		)
Underwriting profit (loss)	115,993			58,774			24,313			(1,399		)		—		197,681
Net investment income	—			—			—			—				183,461		183,461
Net realized investment gains	—			—			—			—				11,676		11,676
Other revenues (insurance)	3,605			6,302			892			327				—		11,126
Other expenses (insurance)	(2,189		)	(2,722		)	—			(10,697		)		—		(15,608		)
Segment profit (loss)	$	117,409		$	62,354		$	25,205		$	(11,769	)		$	195,137	$	388,336
Other revenues (non-insurance)																499,289
Other expenses (non-insurance)																(457,629		)
Amortization of intangible assets																(31,589		)
Interest expense																(58,600		)
Income before income taxes																$	339,807
U.S. GAAP combined ratio (1)	89		%	86		%	94		%	NM			(2)			90		%

⁽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.

22

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

(dollars in thousands)	June 30, 2016		December 31, 2015
Segment assets:
Investing	$	18,976,263	$	18,056,947
Underwriting	5,822,696		5,385,126
Total segment assets	24,798,959		23,442,073
Non-insurance operations	1,536,669		1,497,042
Total assets	$	26,335,628	$	24,939,115

7. Senior Long-Term Debt

On April 5, 2016, the Company issued $400 million of 5.0% unsecured senior notes due April 5, 2046. Net proceeds to the Company were $392.3 million. In April 2016, the Company used a portion of these proceeds to purchase $70.2 million of principal on its 7.35% Senior Notes due 2034 and $108.8 million of principal on its 7.125% 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 the April 2016 issuance to retire its 7.20% unsecured senior notes, when they come due April 14, 2017 ($90.6 million aggregate principal amount of those notes was outstanding at June 30, 2016), and the remainder for general corporate purposes.

On May 5, 2016, the Company issued an additional $100 million of 5.0% unsecured senior notes due April 5, 2046. Net proceeds to the Company were $100.8 million. The Company expects to use the proceeds for general corporate purposes.

In connection with the tender offer and purchase, we recognized a loss on early extinguishment of debt of $44.1 million during the quarter and six months ended June 30, 2016.

23

8. Other Revenues and Other Expenses

The following tables summarize the components of other revenues and other expenses.

	Quarter Ended June 30,
	2016				2015
(dollars in thousands)	Other Revenues		Other Expenses		Other Revenues		Other Expenses
Insurance:
Managing general agent operations	$	1,567	$	2,821	$	3,118	$	2,602
Life and annuity	446		7,199		350		3,348
Other	—		—		469		—
	2,013		10,020		3,937		5,950
Non-Insurance:
Markel Ventures: Manufacturing	193,152		159,227		174,141		168,580
Markel Ventures: Non-Manufacturing	104,602		91,685		65,412		63,013
Investment management	7,350		10,836		—		—
Other	5,724		6,141		6,867		4,693
	310,828		267,889		246,420		236,286
Total	$	312,841	$	277,909	$	250,357	$	242,236

	Six Months Ended June 30,
	2016				2015
(dollars in thousands)	Other Revenues		Other Expenses		Other Revenues		Other Expenses
Insurance:
Managing general agent operations	$	7,107	$	5,099	$	8,988	$	4,911
Life and annuity	941		15,200		327		10,697
Other	—		—		1,811		—
	8,048		20,299		11,126		15,608
Non-Insurance:
Markel Ventures: Manufacturing	385,843		319,593		351,903		320,380
Markel Ventures: Non-Manufacturing	198,430		180,118		133,093		126,843
Investment management	14,523		20,766		—		—
Other	12,020		12,226		14,293		10,406
	610,816		532,703		499,289		457,629
Total	$	618,864	$	553,002	$	510,415	$	473,237

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 companies is operated independently from one another, management aggregates financial results into two industry groups: manufacturing and non-manufacturing.

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9. Reinsurance

The following tables summarize the effect of reinsurance and retrocessional reinsurance on premiums written and earned.

	Quarter Ended June 30,
	2016						2015
(dollars in thousands)	Written			Earned			Written			Earned
Direct	$	957,244		$	865,943		$	951,885		$	875,376
Assumed	320,405			295,868			313,901			304,324
Ceded	(227,103		)	(210,952		)	(231,442		)	(222,143		)
Net premiums	$	1,050,546		$	950,859		$	1,034,344		$	957,557

	Six Months Ended June 30,
	2016						2015
(dollars in thousands)	Written			Earned			Written			Earned
Direct	$	1,836,332		$	1,733,387		$	1,753,465		$	1,719,946
Assumed	833,980			585,931			764,794			617,159
Ceded	(437,806		)	(410,773		)	(448,485		)	(435,898		)
Net premiums	$	2,232,506		$	1,908,545		$	2,069,774		$	1,901,207

The percentage of ceded earned premiums to gross earned premiums was 18% and 19%, respectively, for the quarters and six months ended June 30, 2016 and 2015. The percentage of assumed earned premiums to net earned premiums was 31% and 32%, respectively, for the quarters and six months ended June 30, 2016 and 2015.

Incurred losses and loss adjustment expenses were net of reinsurance recoverables (ceded incurred losses and loss adjustment expenses) of $75.5 million and $143.3 million, respectively, for the quarters ended June 30, 2016 and 2015 and $206.1 million and $232.1 million, respectively, for the six months ended June 30, 2016 and 2015.

10. Life and Annuity Benefits

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.

Life and annuity benefits are also adjusted to the extent unrealized gains on the investments supporting the policy benefit reserves would result in a reserve deficiency if those gains were realized. During the quarter and six months ended June 30, 2016, the Company recognized a reserve deficiency resulting from a decrease in the market yield on the investment portfolio supporting the policy benefit reserves by increasing life and annuity benefits by $47.9 million and decreasing the change in net unrealized holding gains included in other comprehensive income by a corresponding amount. As of June 30, 2016, the cumulative adjustment to life and annuity benefits attributable to unrealized gains on the underlying investment portfolio totaled $47.9 million.

25

11. Income Taxes

The effective tax rate was 26% and 16% for the six months ended June 30, 2016 and 2015, respectively. For the six months ended June 30, 2016, the effective tax rate differs from the U.S. statutory tax rate of 35% primarily as a result of tax-exempt investment income. For the six months ended June 30, 2015, the effective tax rate differs from the U.S. statutory tax rate of 35% primarily as a result of foreign tax credits for foreign taxes paid and tax-exempt investment income. The Company's recognition of foreign tax credits in 2015 had a favorable impact on its effective tax rate for the six months ended June 30, 2015 of 12%. The increase in the effective tax rate in 2016 compared to 2015 was primarily due to the 2015 impact of foreign tax credits described above, partially offset by an increase in estimated annual earnings attributable to foreign operations that are taxed at a lower rate in 2016 compared to 2015.

During the first quarter of 2016, the Internal Revenue Service completed its examination of the Company’s 2012 federal income tax return. There were no adjustments to our income tax liabilities as a result of this examination.

12. Variable Interest Entities

In December 2015, the Company formed Markel CATCo Investment Management Ltd. (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. 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 ($25.2 million as of June 30, 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 June 30, 2016, total assets of the Markel Diversified Fund were $161.8 million and total liabilities were $63.9 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 $158.3 million, 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 June 30, 2016, total investment and insurance assets under management of MCIM for unconsolidated VIEs were $3.4 billion.

26

13. Net Income per Share

Net income per share was determined by dividing adjusted net income to shareholders by the applicable weighted average shares outstanding.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 period.

	Quarter Ended June 30,					Six Months Ended June 30,
(in thousands, except per share amounts)	2016			2015		2016			2015
Net income to shareholders	$	78,797		$	91,369	$	239,167		$	282,361
Adjustment of redeemable noncontrolling interests	(2,529		)	3,062		(5,981		)	1,715
Adjusted net income to shareholders	$	76,268		$	94,431	$	233,186		$	284,076
Basic common shares outstanding	14,012			13,975		14,003			13,973
Dilutive potential common shares from conversion of options	4			9		5			10
Dilutive potential common shares from conversion of restricted stock	72			68		79			74
Diluted shares outstanding	14,088			14,052		14,087			14,057
Basic net income per share	$	5.44		$	6.76	$	16.65		$	20.33
Diluted net income per share	$	5.41		$	6.72	$	16.55		$	20.21

14. 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, for the six months ended June 30, 2016 and 2015.

(dollars in thousands)	Unrealized Holding Gains on Available-for-Sale Securities			Foreign Currency			Net Actuarial Pension Loss			Total
December 31, 2014	$	1,793,254		$	(43,491	)	$	(45,206	)	$	1,704,557
Other comprehensive loss before reclassifications	(109,001		)	(11,373		)	—			(120,374		)
Amounts reclassified from accumulated other comprehensive income	(14,037		)	—			932			(13,105		)
Total other comprehensive income (loss)	(123,038		)	(11,373		)	932			(133,479		)
June 30, 2015	$	1,670,216		$	(54,864	)	$	(44,274	)	$	1,571,078
December 31, 2015	$	1,472,762		$	(72,696	)	$	(45,558	)	$	1,354,508
Other comprehensive income before reclassifications	388,273			2,189			—			390,462
Amounts reclassified from accumulated other comprehensive income	(23,550		)	—			857			(22,693		)
Total other comprehensive income	364,723			2,189			857			367,769
June 30, 2016	$	1,837,485		$	(70,507	)	$	(44,701	)	$	1,722,277

27

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

	Quarter Ended June 30,						Six Months Ended June 30,
(dollars in thousands)	2016			2015			2016			2015
Change in net unrealized gains on investments:
Net holding gains (losses) arising during the period	$	71,381		$	(113,579	)	$	187,880		$	(57,997	)
Change in unrealized other-than-temporary impairment losses on fixed maturities arising during the period	9			(3		)	(6		)	38
Reclassification adjustments for net gains included in net income	(2,333		)	(2,576		)	(7,810		)	(5,672		)
Change in net unrealized gains on investments	69,057			(116,158		)	180,064			(63,631		)
Change in foreign currency translation adjustments	(1,618		)	1,872			(1,695		)	833
Change in net actuarial pension loss	86			117			188			233
Total	$	67,525		$	(114,169	)	$	178,557		$	(62,565	)

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

	Quarter Ended June 30,						Six Months Ended June 30,
(dollars in thousands)	2016			2015			2016			2015
Unrealized holding gains on available-for-sale securities:
Other-than-temporary impairment losses	$	(3,675	)	$	—		$	(12,080	)	$	(5,092	)
Net realized investment gains, excluding other-than-temporary impairment losses	16,575			7,560			43,440			24,801
Total before taxes	12,900			7,560			31,360			19,709
Income taxes	(2,333		)	(2,576		)	(7,810		)	(5,672		)
Reclassification of unrealized holding gains, net of taxes	$	10,567		$	4,984		$	23,550		$	14,037
Net actuarial pension loss:
Underwriting, acquisition and insurance expenses	$	(480	)	$	(586	)	$	(1,045	)	$	(1,165	)
Income taxes	86			117			188			233
Reclassification of net actuarial pension loss, net of taxes	$	(394	)	$	(469	)	$	(857	)	$	(932	)

15. Contingencies

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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Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations

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 consolidated subsidiaries, as well as any variable interest entities (VIEs) that meet the requirements for consolidation (the Company).

Critical Accounting Estimates

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.

Readers are urged to review our 2015 Annual Report on Form 10-K for a more complete description of our critical accounting estimates.

Effective January 1, 2016, we 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.

During the second quarter of 2016, we early adopted FASB ASU No. 2016-09, 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, we 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 our financial position, results of operations or cash flows.

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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. In August 2015, the FASB issued ASU No. 2015-14, Revenue from Contracts with Customers (Topic 606), Deferral of the Effective Date, which deferred the original effective date of ASU No. 2014-09 by one year. As a result, ASU No. 2014-09 becomes effective for us during the first quarter of 2018 and may be applied retrospectively or under a modified retrospective method where the cumulative effect is recognized at the date of initial application. Early application is permitted, but not before the first quarter of 2017. 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 and ASU No. 2016-12, Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients were issued in March, April and May 2016, respectively, as amendments to ASU No. 2014-09. These amendments will be evaluated and adopted in conjunction with ASU No. 2014-09. We are currently evaluating ASU No. 2014-09, and related amendments, to determine the potential impact that adopting this standard will have on our consolidated financial statements. Adoption of this ASU is not expected to have a material impact on our insurance operations, but may have a material impact on our non-insurance operations.

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 us 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. Early adoption is permitted for certain provisions of the ASU. We are currently evaluating ASU No. 2016-01 to determine the potential impact that adopting this standard will have on our consolidated financial statements. Adoption of this ASU is not expected to have a material impact on our financial position, cash flows, or total comprehensive income (loss), but will have a significant impact on our results of operations as changes in fair value will be presented in net income rather than other comprehensive income (loss).

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). The ASU requires lessees to put 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 the 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 us 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. Early adoption is permitted. We are currently evaluating ASU No. 2016-02 to determine the potential impact that adopting this standard will have on our consolidated financial statements.

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, 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 us 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. We are currently evaluating ASU No. 2016-13 to determine the potential impact that adopting this standard will have on the consolidated financial statements.

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Our Business

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 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 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.

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.

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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.

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, including manufacturers of transportation and industrial equipment, and providers of healthcare, housing, data and consulting services. 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 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. Due to the one month lag in consolidating the results of our Markel Ventures operations, the financial results for CapTech are included in our consolidated statements of income and comprehensive income (loss) beginning in January 2016.

Key Performance Indicators

We measure financial success by our ability to compound growth in 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, investing and operating results. We measure underwriting results by our underwriting profit or loss and combined ratio. We measure investing results by 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). Our quarterly performance measures are discussed below in greater detail under "Results of Operations."

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Results of Operations

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

	Quarter Ended June 30,						Six Months Ended June 30,
(dollars in thousands)	2016			2015			2016			2015
Underwriting profit	$	63,723		$	41,711		$	182,757		$	197,681
Net investment income	94,996			90,586			186,290			183,461
Net realized investment gains	17,241			6,105			38,420			11,676
Other revenues	312,841			250,357			618,864			510,415
Amortization of intangible assets	(17,204		)	(16,949		)	(34,464		)	(31,589		)
Other expenses	(277,909		)	(242,236		)	(553,002		)	(473,237		)
Interest expense	(33,697		)	(29,288		)	(64,538		)	(58,600		)
Loss on early extinguishment of debt	(44,100		)	—			(44,100		)	—
Income tax expense	(35,218		)	(7,833		)	(85,908		)	(53,348		)
Net income attributable to noncontrolling interests	(1,876		)	(1,084		)	(5,152		)	(4,098		)
Net income to shareholders	$	78,797		$	91,369		$	239,167		$	282,361

The components of net income to shareholders are discussed in detail under "Underwriting Results," "Investing Results," "Other Revenues and Other Expenses" and "Interest Expense, Loss on Early Extinguishment of Debt and Income Taxes."

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.

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Consolidated

The following table presents selected data from our underwriting operations.

	Quarter Ended June 30,								Six Months Ended June 30,
(dollars in thousands)	2016				2015				2016				2015
Gross premium volume	$	1,277,649			$	1,265,786			$	2,670,312			$	2,518,259
Net written premiums	1,050,546				1,034,344				2,232,506				2,069,774
Net retention	82		%		82		%		84		%		82		%
Earned premiums	950,859				957,557				1,908,545				1,901,207
Losses and loss adjustment expenses	511,556				536,194				985,520				983,189
Underwriting, acquisition and insurance expenses	375,580				379,652				740,268				720,337
Underwriting profit	63,723				41,711				182,757				197,681
U.S. GAAP Combined Ratios (1)
U.S. Insurance	94		%		93		%		91		%		89		%
International Insurance	100		%		98		%		98		%		86		%
Reinsurance	86		%		100		%		84		%		94		%
Other Insurance (Discontinued Lines)	NM			(2)	NM			(2)	NM			(2)	NM			(2)
Markel Corporation (Consolidated)	93		%		96		%		90		%		90		%

⁽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. A combined ratio less than 100% indicates an underwriting profit, while a combined ratio greater than 100% reflects an underwriting loss. The U.S. GAAP combined ratio is the sum of the loss ratio and the expense ratio.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.

⁽²⁾  NM – Ratio is not meaningful.

Our combined ratio was 93% and 90%, respectively, for the quarter and six months ended June 30, 2016 compared to 96% and 90%, respectively, for the same periods of 2015.

The decrease in the consolidated combined ratio for the quarter ended June 30, 2016 was driven by a lower current accident year loss ratio and more favorable development of prior years' loss reserves compared to the same period of 2015. The consolidated combined ratio for the quarter ended June 30, 2016, included $25.3 million, or three points on the consolidated combined ratio, of underwriting loss related to the Canadian wildfires that occurred in the second quarter of 2016. The impact of these losses on the 2016 current accident year loss ratio was more than offset by lower attritional losses in our International Insurance and Reinsurance segments in 2016 compared to 2015, as well as lower loss ratios across many of our product lines in 2016. Following the completion of two retroactive reinsurance transactions in 2015, we have less variability in our consolidated loss reserves.  Additionally, management continues to gain confidence in the actuarial projections on product lines previously written by Alterra Capital Holdings Limited, 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 has decreased compared to the same period of 2015. We continue to maintain a consolidated confidence level in a range consistent with our historic levels. The increase in prior year redundancies for the quarter ended June 30, 2016 was attributable to our Reinsurance segment across various product lines.

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For the six months ended June 30, 2016, the consolidated combined ratio was flat compared to 2015, as a lower current accident year loss ratio was offset by less favorable development on prior years' loss reserves in 2016 compared to 2015. The current accident year loss ratio included $25.3 million, or one point on the consolidated combined ratio, of underwriting loss related to the Canadian wildfires that occurred in the second quarter of 2016. The impact of these losses on the 2016 consolidated combined ratio was more than offset by lower attritional losses in our International Insurance and Reinsurance segments in 2016 compared to 2015, and lower loss ratios across several product lines resulting from a decrease in management's best estimate of ultimate loss ratios, as described above. Redundancies on prior years' loss reserves in 2015 included $36.0 million, or two points on the consolidated combined ratio, 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 during 2015 occurred in our U.S. Insurance and International Insurance segments.

U.S. Insurance Segment

The combined ratio for the U.S. Insurance segment was 94% and 91%, respectively, for the quarter and six months ended June 30, 2016 compared to 93% and 89%, respectively, for the same periods of 2015.

For the quarter ended June 30, 2016, the increase in the combined ratio was driven by less favorable development of prior accident years' loss reserves.

• The current accident year loss ratio was flat for the quarter ended June 30, 2016 compared to 2015. We experienced higher attritional losses in 2016, primarily on our professional liability and property product lines, which was offset by a favorable impact resulting from a decrease in management's best estimate of ultimate loss ratios on various product lines, as previously discussed.

• The U.S. Insurance segment's combined ratio for the quarter ended June 30, 2016 included $66.3 million of favorable development on prior years' loss reserves compared to $68.6 million for the same period in 2015. The favorable development on prior years' loss reserves in 2016 occurred across several product lines, but was most significant on our general liability product lines across several accident years, our property product lines on the 2014 and 2015 accident years, and on our workers compensation product lines on the 2012 through 2015 accident years. Favorable development on prior years' loss reserves in 2016 was partially offset by adverse development on our medical malpractice and specified medical product lines, primarily on the 2013 through 2015 accident years, 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. In response, we have taken corrective actions for business written in the affected classes. During the second quarter of 2015, favorable development on prior years' loss reserves was most significant on our casualty and brokerage property product lines.

For the six months ended June 30, 2016, the increase in the combined ratio was driven by less favorable development of prior accident years' loss reserves, partially offset by a lower current accident year loss ratio.

• The decrease in the current accident year loss ratio for the six months ended June 30, 2016 was primarily due to a decrease in management's best estimate of ultimate loss ratios on various product lines, as previously discussed. The attritional loss ratio for the six months ended June 30, 2016 was flat compared to 2015, as lower attritional losses on our general liability product lines were offset by higher attritional losses on our professional liability product lines.

• The U.S. Insurance Segment's combined ratio for the six months ended June 30, 2016 included $105.0 million of favorable development on prior years' loss reserves compared to $136.2 million for the same period in 2015. Redundancies on prior years' loss reserves in 2015 included $19.0 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 during the first quarter of 2015, as previously discussed. The favorable development on prior years' loss reserves in 2016 was most significant on our general liability product lines across several accident years, and on our workers compensation product lines, on the 2012 through 2015 accident years. Favorable development on prior years' loss reserves in 2016 was partially offset by adverse development on our medical malpractice and specified medical product lines, primarily on the 2010 through 2015 accident years, as previously discussed. During 2015, favorable development on prior years' loss reserves was most significant on our casualty lines, and on our professional liability, brokerage property and workers compensation product lines.

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International Insurance Segment

The combined ratio for the International Insurance segment was 100% and 98%, respectively, for the quarter and six months ended June 30, 2016 compared to 98% and 86%, respectively, for the same periods of 2015.

For the quarter ended June 30, 2016, the increase in the combined ratio was driven by a higher expense ratio, partially offset by a lower current accident year loss ratio compared to the same period of 2015.

• The current accident year loss ratio for the three months ended June 30, 2016 included $4.6 million, or two points on the segment combined ratio, of underwriting loss related to the Canadian wildfires that occurred in the second quarter. The impact of these losses on the 2016 current accident year loss ratio was more than offset by lower attritional loss ratios in 2016 compared to 2015, primarily on our professional liability product lines, and a decrease in management's best estimate of ultimate loss ratios on various product lines, as previously discussed.

• The International Insurance segment's combined ratio for the quarter ended June 30, 2016 included $39.0 million of favorable development on prior years' loss reserves compared to $43.4 million in 2015. In 2016, the favorable development on prior years' loss reserves was most significant on our professional liability product lines across several accident years. The favorable development in 2015 was most significant on our marine and energy and professional liability product lines.

• The increase in the expense ratio was primarily due to the write off of previously capitalized software development costs in the second quarter of 2016.

For the six months ended June 30, 2016, the increase in the combined ratio was driven by less favorable development on prior years' loss reserves and a higher expense ratio, partially offset by a lower current accident year loss ratio compared to the same period of 2015.

• The current accident year loss ratio for the six months ended June 30, 2016 included $4.6 million, or one point on the segment combined ratio, of underwriting loss related to the Canadian wildfires that occurred in the second quarter. This increase was more than offset by lower attritional loss ratios, primarily on our general liability and professional liability product lines in 2016 compared to 2015 and a decrease in management's best estimate of ultimate loss ratios on various product lines, as previously discussed.

• The International Insurance segment's combined ratio for the six months ended June 30, 2016 included $68.7 million of favorable development on prior years' loss reserves compared to $120.0 million in 2015. The decrease in loss reserve redundancies on prior years' loss reserves in 2016 compared to 2015 was driven by less favorable development on our marine and energy and general liability product lines in 2016. Additionally, redundancies on prior years' loss reserves in 2015 included $17.0 million, or four 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 during the first quarter of 2015, as previously discussed. For the six months ended June 30, 2016, the favorable development on prior years' loss reserves was most significant on our professional liability product lines across several accident years and our marine and energy product lines, primarily on the 2011 through 2015 accident years. For the six months ended June 30, 2015, the favorable development on prior years' loss reserves occurred across several product lines, but was most significant on our marine and energy and general liability product lines.

• The increase in the expense ratio was primarily due to the write off of previously capitalized software development costs during the second quarter of 2016. The increase in the expense ratio was also due in part to higher earned premiums on certain products in our marine and energy and professional liability lines in 2016 compared to 2015, which carry higher commission rates than other products in the International Insurance segment.

Reinsurance Segment

The combined ratio for the Reinsurance segment was 86% and 84%, respectively, for the quarter and six months ended June 30, 2016 compared to 100% and 94%, respectively, for the same periods of 2015.

For the quarter ended June 30, 2016 the decrease in the combined ratio was driven by more favorable development on prior years' loss reserves, a lower expense ratio and a lower current accident year loss ratio compared to the same period of 2015.

• The current accident year loss ratio included $20.7 million, or ten points on the segment combined ratio, of underwriting loss related to the Canadian wildfires that occurred in the second quarter. This increase was more than offset by lower attritional loss ratios in 2016, primarily on our property product lines due to fewer large losses in 2016 compared to 2015, and a decrease in management's best estimate of ultimate loss ratios on various product lines, as previously discussed.

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• The Reinsurance segment's combined ratio for the quarter ended June 30, 2016 included $34.6 million of favorable development on prior years' loss reserves compared to $15.1 million in 2015. The increase in loss reserve redundancies in 2016 compared to 2015 was driven by more favorable development across various product lines in 2016. The favorable development on prior years' loss reserves in 2016 was across several product lines but was most significant on our property lines, primarily on the 2012 through 2015 accident years. The favorable development on prior years' loss reserves in 2015 was most significant on our casualty and property lines of business.

• The decrease in the expense ratio is due in part to lower profit sharing in the second quarter of 2016 compared to 2015 and a non-recurring benefit to expenses related to the cancellation of an underwriting services contract.

For the six months ended June 30, 2016 the decrease in the combined ratio was driven by more favorable development on prior years' loss reserves and a lower current accident year loss ratio compared to the same period of 2015.

• The current accident year loss ratio for the six months ended June 30, 2016 included $20.7 million, or five points on the segment combined ratio, of underwriting loss related to the Canadian wildfires that occurred in the second quarter. This increase was more than offset by lower attritional loss ratios in 2016, primarily on our property product lines due to fewer large losses in 2016 compared to 2015, and a decrease in management's best estimate of ultimate loss ratios on various product lines, as previously discussed.

• The Reinsurance segment's combined ratio for the six months ended June 30, 2016 included $71.0 million of favorable development on prior years' loss reserves compared to $41.5 million in 2015. The increase in loss reserve redundancies in 2016 compared to 2015 was driven by more favorable development across various product lines in 2016. The favorable development on prior years' loss reserves in 2016 was across several product lines but was most significant on our property lines, primarily on the 2013 through 2015 accident years, and on our workers compensation product lines across several accident years. The favorable development on prior years' loss reserves in 2015 was most significant on our casualty and property lines of business.

Other Insurance (Discontinued Lines)

The Other Insurance (Discontinued Lines) segment produced an underwriting loss of $0.3 million and an underwriting profit of $13.5 million for the quarter and six months ended June 30, 2016, respectively, compared to an underwriting profit of $1.6 million and an underwriting loss of $1.4 million for the same periods of 2015. The underwriting profit in the first six months of 2016 was driven by a commutation that was completed during the period.

Premiums and Net Retentions

The following tables summarize gross premium volume, net written premiums and earned premiums by segment.

Gross Premium Volume
	Quarter Ended June 30,					Six Months Ended June 30,
(dollars in thousands)	2016			2015		2016			2015
U.S. Insurance	$	689,468		$	668,853	$	1,337,258		$	1,254,218
International Insurance	318,581			338,159		609,985			627,386
Reinsurance	269,604			258,745		723,090			636,582
Other Insurance (Discontinued Lines)	(4		)	29		(21		)	73
Total	$	1,277,649		$	1,265,786	$	2,670,312		$	2,518,259

Gross premium volume for the quarter and six months ended June 30, 2016 increased 1% and 6%, respectively, compared to the same periods of 2015. The increase in gross premium volume for both the quarter and six months ended June 30, 2016 was attributable to the Reinsurance and U.S. Insurance segments, partially offset by lower gross premium volume in our International Insurance segment.

Gross premium volume in our Reinsurance segment increased 4% and 14% for the quarter and six months ended June 30, 2016, respectively. For the quarter ended June 30, 2016, the increase was driven by new business in our mortgage line, partially offset by an unfavorable impact from the timing of renewals on multi-year contracts which were lower in the second quarter of 2016 compared to 2015. For the six months ended June 30, 2016, the increase in gross premium volume in the Reinsurance segment was driven by new business in our general liability and mortgage lines, as well as a favorable impact from the timing of renewals on multi-year contracts in 2016 compared to 2015.

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Gross premium volume in our U.S. Insurance segment increased 3% and 7% for the quarter and six months ended June 30, 2016, respectively. The increase in gross premium volume for the three months ended June 30, 2016 was driven by growth within our personal lines and general liability lines. The increase for the six months ended June 30, 2016 was driven by 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. The increase in gross premium volume in the U.S. Insurance segment for the six months ended June 30, 2016 was also attributable to higher premium volumes across most product lines, primarily general liability and personal lines.

Gross premium volume in our International Insurance segment decreased 6% and 3% for the quarter and six months ended June 30, 2016, respectively. The decrease in gross premium volume for both periods was primarily due to lower premium volume within our marine and energy and property product lines, as well as an unfavorable impact from foreign currency exchange rate movements.

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. 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.

Net Written Premiums
	Quarter Ended June 30,					Six Months Ended June 30,
(dollars in thousands)	2016			2015		2016		2015
U.S. Insurance	$	579,233		$	554,638	$	1,131,978	$	1,050,807
International Insurance	244,636			264,129		471,035		486,837
Reinsurance	226,681			215,520		629,407		531,732
Other Insurance (Discontinued Lines)	(4		)	57		86		398
Total	$	1,050,546		$	1,034,344	$	2,232,506	$	2,069,774

Net retention of gross premium volume for the quarter and six months ended June 30, 2016 was 82% and 84%, respectively, compared to 82% for both the quarter and six months ended June 30, 2015. The increase in net retention for the six months ended June 30, 2016 compared to the same period of 2015 was driven by higher retention within the Reinsurance segment. This increase is largely due to changes in mix of business.

Earned Premiums
	Quarter Ended June 30,					Six Months Ended June 30,
(dollars in thousands)	2016			2015		2016		2015
U.S. Insurance	$	533,328		$	520,446	$	1,065,796	$	1,035,000
International Insurance	203,052			223,941		418,397		429,902
Reinsurance	214,514			213,140		424,133		435,894
Other Insurance (Discontinued Lines)	(35		)	30		219		411
Total	$	950,859		$	957,557	$	1,908,545	$	1,901,207

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Earned premiums were flat for both the quarter and six months ended June 30, 2016 compared to the same periods of 2015. For the quarter ended June 30, 2016, lower earned premiums in our International Insurance segment were largely offset by higher earned premiums in our U.S. Insurance segment. For the six months ended June 30, 2016, higher earned premiums in our U.S. Insurance segment largely offset lower earned premiums in our International Insurance and Reinsurance segments. The decrease in earned premiums in our International Insurance segment for the quarter ended June 30, 2016 was primarily due to the decrease in gross premium volume in our marine and energy product lines. For the six months ended June 30, 2016, the decrease in earned premiums in our International Insurance segment was primarily due to an unfavorable impact from movements in foreign currency exchange rates. The increase in earned premiums in our U.S. Insurance segment for both periods of 2016 was primarily due to the increases in gross premium volume. The decrease in earned premiums in our Reinsurance segment for the six months ended June 30, 2016 was primarily due to lower earned premiums in our auto business. In late 2014, we ceased writing auto reinsurance in the United Kingdom. At the same time, a decision was made to decrease our quota share percentages on our non-standard auto reinsurance business in the United States.

Investing Results

The following table summarizes our investment performance.

	Quarter Ended June 30,						Six Months Ended June 30,
(dollars in thousands)	2016			2015			2016			2015
Net investment income	$	94,996		$	90,586		$	186,290		$	183,461
Net realized investment gains	$	17,241		$	6,105		$	38,420		$	11,676
Change in net unrealized gains on investments	$	255,844		$	(351,332	)	$	592,691		$	(186,669	)
Investment yield (1)	0.6		%	0.6		%	1.2		%	1.2		%
Taxable equivalent total investment return, before foreign currency effect							4.9		%	0.3		%
Taxable equivalent total investment return							4.9		%	(0.5		)%

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

We 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.

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

	Six Months Ended June 30,
	2016		2015
Investment yield (1)	1.2	%	1.2	%
Adjustment of investment yield from book value to market value	(0.2	)%	(0.2	)%
Net amortization of net premium on fixed maturity securities	0.2	%	0.3	%
Net realized investment gains and change in net unrealized gains on investments	3.5	%	(0.9	)%
Taxable equivalent effect for interest and dividends (2)	0.2	%	0.3	%
Other (3)	—	%	(1.2	)%
Taxable equivalent total investment return	4.9	%	(0.5	)%

⁽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.

The increase in net investment income for the quarter ended June 30, 2016 was driven by higher bond income on our fixed maturity portfolio due to increased holdings of fixed maturity securities. This increase was partially offset by decreased dividend income on our equity portfolio due to lower dividend-yielding equity security holdings in 2016 compared to 2015. See note 4(d) of the notes to consolidated financial statements for details regarding the components of net investment income. Net realized investment gains for the quarter and six months ended June 30, 2016 were net of $3.7 million and $12.1 million, respectively, of write downs for other-than-temporary declines in the estimated fair value of investments, all of which were attributable to equity securities. Net realized investment gains for the six months ended June 30, 2015 were net of write downs for other-than-temporary declines in the estimated fair value of investments of $5.1 million. There were no write downs for other-than-temporary declines in the estimated fair value of investments for the quarter ended June 30, 2015.

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 June 30, 2016, we held securities with gross unrealized losses of $43.5 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 June 30, 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.

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Other Revenues and Other Expenses

Markel Ventures Operations

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 (loss). We consolidate our Markel Ventures operations on a one-month lag. The following table summarizes the operating revenues, net income (loss) to shareholders and EBITDA from our Markel Ventures operations.

	Quarter Ended June 30,					Six Months Ended June 30,
(dollars in thousands)	2016		2015			2016		2015
Operating revenues	$	297,754	$	239,553		$	584,273	$	484,996
Net income (loss) to shareholders	$	21,957	$	(2,554	)	$	36,030	$	7,956
EBITDA	$	50,898	$	13,180		$	92,042	$	46,769

Revenues from our Markel Ventures operations increased $58.2 million and $99.3 million for the quarter and six months ended June 30, 2016, respectively, compared to the same periods of 2015. In both periods, the increase in revenues was primarily attributable to our December 2015 acquisition of CapTech and higher revenues within certain of our manufacturing operations, due in part to higher sales volume in 2016 compared to 2015.

Net income to shareholders and EBITDA from our Markel Ventures operations increased for the three and six months ended June 30, 2016 due to lower operating expenses within our manufacturing operations compared to the same periods of 2015. In 2015, operating expenses for our manufacturing operations included $17.6 million of expense recognized in the second quarter as a result of an increase in our estimate of the contingent consideration obligation related to the acquisition of Cottrell. There was no similar charge in 2016. We also experienced higher sales volume and margins at certain of our manufacturing operations as a result of continued increased demand for equipment manufactured to support transportation-related industries. The increase in net income to shareholders and EBITDA in both periods was also due in part to the acquisition of CapTech.

Markel Ventures 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 or levels of depreciation and amortization resulting from purchase accounting. The following table reconciles EBITDA of Markel Ventures, net of noncontrolling interests, to consolidated net income to shareholders.

	Quarter Ended June 30,						Six Months Ended June 30,
(dollars in thousands)	2016			2015			2016			2015
Markel Ventures EBITDA - Manufacturing	$	35,879		$	8,261		$	70,518		$	36,094
Markel Ventures EBITDA - Non-Manufacturing	15,019			4,919			21,524			10,675
Markel Ventures EBITDA - Total	50,898			13,180			92,042			46,769
Interest expense (1)	(3,953		)	(3,330		)	(7,605		)	(6,868		)
Income tax expense	(10,185		)	1,139			(19,063		)	(5,031		)
Depreciation expense	(8,049		)	(7,215		)	(15,828		)	(14,242		)
Amortization of intangible assets	(6,754		)	(6,328		)	(13,516		)	(12,672		)
Markel Ventures net income (loss) to shareholders	21,957			(2,554		)	36,030			7,956
Income before income taxes from other Markel operations	80,745			102,581			269,098			322,782
Income tax expense from other Markel operations	(23,905		)	(8,658		)	(65,961		)	(48,377		)
Net income to shareholders	$	78,797		$	91,369		$	239,167		$	282,361

⁽¹⁾  Interest expense for the quarters ended June 30, 2016 and 2015 includes intercompany interest expense of $2.4 million and $2.5 million, respectively. Interest expense for the six months ended June 30, 2016 and 2015 includes intercompany interest expense of $4.7 million and $5.1 million, respectively.

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

Interest Expense

Interest expense was $33.7 million and $64.5 million for the three and six months ended June 30, 2016, respectively, compared to $29.3 million and $58.6 million for the same periods of 2015. The increase in interest expense for both periods of 2016 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.

Loss on Early Extinguishment of Debt

On April 5, 2016, we issued $400 million of 5.0% unsecured senior notes due April 5, 2046. Net proceeds were $392.3 million. In April 2016, 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 the April 2016 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 June 30, 2016), and the remainder for general corporate purposes. On May 5, 2016, we issued an additional $100 million of 5.0% unsecured senior notes due April 5, 2046. Net proceeds were $100.8 million. We expect to use the proceeds for general corporate purposes.

In connection with the tender offer and purchase, we recognized a loss on early extinguishment of debt of $44.1 million during the quarter and six months ended June 30, 2016. Replacing this debt with our 5.0% unsecured senior notes due April 5, 2046 extended the average term of our senior notes at a more favorable interest rate.

Income Taxes

The effective tax rate was 26% and 16% for the six months ended June 30, 2016 and 2015, respectively. For the six months ended June 30, 2016, the effective tax rate differs from the U.S. statutory tax rate of 35% primarily as a result of tax-exempt investment income. For the six months ended June 30, 2015, the effective tax rate differs from the U.S. statutory rate of 35% primarily as a result of foreign tax credits for foreign taxes paid and tax-exempt investment income. Our recognition of foreign tax credits in 2015 had a favorable impact on our 2015 effective tax rate for the six months ended June 30, 2015 of 12%. The increase in the effective tax rate in 2016 compared to 2015 was primarily due to the 2015 impact of foreign tax credits described above, partially offset by an increase in estimated annual earnings attributable to foreign operations that are taxed at a lower rate in 2016 compared to 2015. Foreign tax credits of the magnitude recognized in 2015 are not expected in future periods.

Our effective tax rate, which is based upon the estimated annual effective tax rate, may fluctuate from period to period based on the relative mix of income or loss reported by jurisdiction and the varying tax rates in each jurisdiction.

Comprehensive Income (Loss) to Shareholders

Comprehensive income to shareholders was $209.9 million for the second quarter of 2016 compared to a comprehensive loss to shareholders of $132.9 million for the same period of 2015. Comprehensive income to shareholders for the second quarter of 2016 included net income to shareholders of $78.8 million, an increase in net unrealized gains on investments, net of taxes, of $138.9 million and unfavorable foreign currency translation adjustments, net of taxes, of $8.1 million. Comprehensive loss to shareholders for the second quarter of 2015 included net income to shareholders of $91.4 million, a decrease in net unrealized gains on investments, net of taxes, of $235.2 million and favorable foreign currency translation adjustments, net of taxes, of $10.4 million.

Comprehensive income to shareholders was $606.9 million for the six months ended June 30, 2016 compared to $148.9 million for the same period of 2015. Comprehensive income to shareholders for the six months ended June 30, 2016 included net income to shareholders of $239.2 million, an increase in net unrealized gains on investments, net of taxes, of $364.7 million and favorable foreign currency translation adjustments, net of taxes, of $2.2 million. Comprehensive income to shareholders for the six months ended June 30, 2015 included net income to shareholders of $282.4 million, a decrease in net unrealized gains on investments, net of taxes, of $123.0 million and unfavorable foreign currency translation adjustments, net of taxes, of $11.4 million.

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The increase in net unrealized gains on investments, net of taxes, for both the quarter and six months ended June 30, 2016 was attributable to an increase in the fair value of both our fixed maturity and equity portfolios compared to March 31, 2016 and December 31, 2015, respectively. The increase in net unrealized gains on investments for both the quarter and six months ended June 30, 2016 was net of a $47.9 million adjustment to reclassify unrealized gains on the investments supporting future policy benefits to life and annuity benefit reserves. See note 10 of the notes to consolidated financial statements for further discussion of this adjustment.

The decrease in net unrealized gains on investments, net of taxes, for both the quarter and six months ended June 30, 2015 was attributable to a decrease in the fair value of our fixed maturity portfolio as of June 30, 2015 compared to March 31, 2015 and December 31, 2014, respectively. The quarter ended June 30, 2015 also reflected the impact of a decline in the fair value of our equity portfolio.

Financial Condition

Investments, cash and cash equivalents and restricted cash and cash equivalents (invested assets) were $19.2 billion at June 30, 2016 compared to $18.2 billion at December 31, 2015. Net unrealized gains on investments, net of taxes, were $1.8 billion at June 30, 2016 compared to $1.5 billion at December 31, 2015. Equity securities were $4.4 billion, or 23% of invested assets, at June 30, 2016 compared to $4.1 billion, or 22% of invested assets, at December 31, 2015.

Net cash provided by operating activities was $70.2 million for the six months ended June 30, 2016 compared $238.0 million for the same period of 2015. Net cash provided by operating activities for the six months ended June 30, 2016 included higher claims payments due to increased claims settlement activity, primarily in the U.S. Insurance segment, and higher payments for employee profit sharing and income taxes compared to the same period of 2015. Net cash provided by operating activities for the six months ended June 30, 2016 was net of a $51.9 million cash payment made in connection with a commutation that was completed during the period. Net cash provided by operating activities for the six months ended June 30, 2015 was net of a $29.0 million cash payment made to transfer out obligations under a reinsurance contract for life and annuity benefits to a third party. Net cash provided by operating activities for the six months ended June 30, 2015 was also net of a $69.9 million cash payment made in connection with a retrospective reinsurance transaction completed March 9, 2015, in which we ceded a portfolio of policies comprised of liabilities arising from A&E exposures that originated before 1992 to a third party.

Net cash used by investing activities was $920.3 million for the six months ended June 30, 2016 compared to $288.3 million for the same period of 2015. During 2016, we increased our purchases of fixed maturities and also allocated funds for purchases of equity securities. Cash flows 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.

Net cash provided by financing activities was $229.9 million for the six months ended June 30, 2016 compared to net cash used by financing activities of $48.3 million for the same period of 2015. On April 5, 2016, we issued $400 million of 5.0% unsecured senior notes due April 5, 2046. Net proceeds were $392.3 million. In April 2016, 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 $95.0 million and $126.4 million, respectively. On May 5, 2016, the Company issued an additional $100 million of 5.0% unsecured senior notes due April 5, 2046. Net proceeds to the Company were $100.8 million. Cash of $15.2 million and $22.7 million was used to repurchase shares of our common stock during the first six months of 2016 and 2015, respectively.

We seek to maintain prudent levels of liquidity and financial leverage for the protection of our policyholders, creditors and shareholders. Our target capital structure includes approximately 30% debt. Our debt to capital ratio was 24% at June 30, 2016 and 22% at December 31, 2015. From time to time, our debt to capital ratio may increase due to business opportunities that may be financed in the short term with debt. Alternatively, our debt to capital ratio may fall below our target capital structure, which provides us with additional borrowing capacity to respond when future opportunities arise.

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.

Our holding company had $1.8 billion and $1.6 billion of invested assets at June 30, 2016 and December 31, 2015, respectively. The increase in invested assets is primarily the result of net proceeds from the net issuance of long-term debt during the second quarter of 2016.

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Shareholders' equity was $8.4 billion at June 30, 2016 and $7.8 billion at December 31, 2015. Book value per share increased to $603.13 at June 30, 2016 from $561.23 at December 31, 2015, primarily due to $606.9 million of comprehensive income to shareholders for the six months ended June 30, 2016.

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 June 30, 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 June 30, 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.

During the quarter ended June 30, 2016, we agreed to 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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Item 3. Quantitative and Qualitative Disclosures About Market Risk

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 risk; however, this risk is not material to the Company. During the six months ended June 30, 2016, there were no material changes to the market risk components described in our Annual Report on Form 10-K for the year ended December 31, 2015.

The estimated fair value of our investment portfolio at June 30, 2016 was $19.2 billion, 77% of which was invested in fixed maturities, short-term investments, cash and cash equivalents and restricted cash and cash equivalents and 23% 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.

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 June 30, 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. During the six months ended June 30, 2016, there were no material changes in our foreign government fixed maturity holdings.

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.

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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Item 4. Controls and Procedures

As of the end of the period covered by this quarterly report, 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.

There were no changes in our internal control over financial reporting during the second 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" and "Safe Harbor and Cautionary Statement" in our 2015 Annual Report on Form 10-K, Item 1A in Part II of this report 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 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 maturities and equity securities, as well as the carrying value of our other assets and liabilities, and this impact may be heightened by market volatility;

47

• 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 of the implementation of U.S. health care reform legislation and regulations under that legislation on our businesses;

• we are dependent upon the successful functioning and security of our computer systems; if our information technology 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 expanding international operations expose us to increased investment, political 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 business, 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 interest and foreign currency exchange rates; and

• adverse changes in our assigned financial strength or debt ratings could adversely impact our ability to attract and retain business or obtain 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.

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PART II. OTHER INFORMATION

Item 1A. Risk Factors

Other than the risk factor discussed below, there have been no material changes with regard to the risk factors previously disclosed in our 2015 Annual Report on Form 10-K. For other factors that may cause actual results to differ materially from those indicated in any forward-looking statement contained in this report, see "Safe Harbor and Cautionary Statement."

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"). The U.K. has not yet given official notice of its intention to leave the E.U. 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 the ability of both Markel International Insurance Company Limited (MIICL) and our Lloyd's syndicate to transact business in E.U. countries and the basis on which MIICL’s branches can operate in the E.U. could be limited or cease. We may decide to relocate certain of our European operations to a member country of the E.U. in order to continue transacting business in the E.U. The Brexit vote had an immediate adverse effect on global financial markets, including foreign currency markets, and could continue to contribute to instability in global financial markets and in European and worldwide economic or market conditions, both during and after the Brexit process. 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.

Item 6. Exhibits

See Exhibit Index for a list of exhibits filed as part of this report.

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Signatures

Pursuant to the requirements 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, this 2^nd day of August 2016.

Markel Corporation
By:	/s/ Alan I. Kirshner
	Alan I. Kirshner
	Executive Chairman
	(Principal Executive Officer)
By:	/s/ Anne G. Waleski
	Anne G. Waleski
	Executive Vice President and Chief Financial Officer
	(Principal Financial Officer)

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Exhibit Index

Exhibit No.	Document Description
3(i)	Amended and Restated Articles of Incorporation (3.1)a
3(ii)	Bylaws, as amended (3.1)b
4.1	Indenture dated as of June 5, 2001, between Markel Corporation and The Chase Manhattan Bank, as Trustee (4.1)c
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 (4.2)d
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 (4.2)e
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 (4.2)f
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 (4.2)g
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 (4.2)h
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 (4.3)h
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 (4.2)i
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 (4.14)j
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 (4.15)j
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 (4.16)k
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 (4.17)k
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.
10.1	2016 Equity Incentive Compensation Plan (10.1)l
10.2	2016 Employee Stock Purchase and Bonus Plan (10.2)l
10.3	Form of Performance Based Restricted Stock Unit Award Agreement for Executive Officers for the 2016 Equity Incentive Compensation Plan*
10.4	Form of Time Based (Cliff Vesting) Restricted Stock Unit Award Agreement for Executive Officers for the 2016 Equity Incentive Compensation Plan*
10.5	Form of Time Based (Graded Vesting) Restricted Stock Unit Award Agreement for Executive Officers for the 2016 Equity Incentive Compensation Plan*
10.6	Form of Restricted Stock Award Agreement for Outside Directors for the 2016 Equity Incentive Compensation Plan*
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)*

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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 Quarterly Report on Form 10-Q for the quarter ended June 30, 2016, filed on August 2, 2016, formatted in XBRL: (i) Consolidated Balance Sheets, (ii) Consolidated Statements of Income and Comprehensive Income (Loss), (iii) Consolidated Statements of Changes in Equity, (iv) Condensed Consolidated Statements of Cash Flows and (v) Notes to Consolidated Financial Statements.*

* Filed with this report.

a. Incorporated by reference from the Exhibit shown in parentheses filed with the Commission in the Registrant's report on Form 8-K filed on May 13, 2011.

b. Incorporated by reference from the Exhibit shown in parentheses filed with the Commission in the Registrant's report on Form 8-K filed on November 20, 2015.

c. Incorporated by reference from the Exhibit shown in parentheses filed with the Commission in the Registrant's report on Form 8-K filed on June 5, 2001.

d. Incorporated by reference from the Exhibit shown in parentheses filed with the Commission in the Registrant's report on Form 8-K filed on August 11, 2004.

e. Incorporated by reference from the Exhibit shown in parentheses filed with the Commission in the Registrant's report on Form 8-K filed on September 21, 2009.

f. Incorporated by reference from the Exhibit shown in parentheses filed with the Commission in the Registrant's report on Form 8-K filed on May 31, 2011.

g. Incorporated by reference from the Exhibit shown in parentheses filed with the Commission in the Registrant's report on Form 8-K filed on June 29, 2012.

h. Incorporated by reference from the Exhibit shown in parentheses filed with the Commission in the Registrant's report on Form 8-K filed on March 7, 2013.

i. Incorporated by reference from the Exhibit shown in parentheses filed with the Commission in the Registrant's report on Form 8-K filed on March 31, 2016.

j. Incorporated by reference from the Exhibit shown in parentheses filed with the Commission in the Registrant's report on Form 10-Q for the quarter ended June 30, 2013.

k. Incorporated by reference from the Exhibit shown in parentheses filed with the Commission in the Registrant's report on Form 10-Q for the quarter ended June 30, 2014.

l. Incorporated by reference from the Exhibit shown in parentheses filed with the Commission in the Registrant's report on Form 8-K filed on May 19, 2016.

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EX-10.3

Exhibit 10.3

MARKEL CORPORATION

PERFORMANCE-BASED RESTRICTED STOCK UNIT

AWARD AGREEMENT

AWARDED TO	AWARD DATE	VESTING SCHEDULE1
	For example: February XX, 2017	VESTING DATE 12/31/2020	PERCENTAGE OF UNITS 100%

MARKEL CORPORATION (the "Company") grants you (the "Participant") the opportunity to receive restricted stock units ("Units"). The number of Units will be based on performance conditions as specified below. Until the Vesting Date, except as specifically provided below, the Units are forfeitable and nontransferable. The Compensation Committee of the Company's Board of Directors (the "Committee") will administer this Agreement and any decision of the Committee will be final and conclusive. Capitalized terms not defined herein have the meanings provided in the Markel Corporation 2016 Equity Incentive Compensation Plan (the "Plan").

The terms of the award are:

1. Performance Conditions: The performance conditions are set forth on Exhibit A. Upon certification by the Committee of the completion of the performance conditions, the dollar equivalent of the percentage of salary will be determined. The Participant will receive a number of Units determined by dividing the dollar equivalent by the Fair Market Value of a share of Company Stock on the date that the completion of the performance conditions is certified by the Committee or its designee (the "Determination Date"). No Units will be awarded hereunder if the Participant separates from service for any reason before the Determination Date.

2. Vesting For Units. If the Participant has not separated from service before the Vesting Date, the Units will become vested and non-forfeitable, and the Company will issue to the Participant for each vested Unit a share of Company Stock on that date (or such later date as may be elected by the Participant pursuant to a valid deferral election in accordance with procedures determined

¹If necessary or appropriate to ensure orderly administration of the Company’s payroll and tax reporting obligations, the Company may accelerate vesting and payment of restricted stock units up to a maximum of thirty days before the date on which such restricted stock units would otherwise have vested and been paid.

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by the Company) or, in either case, as soon as administratively practicable (but in any event no later than 90 days) thereafter.

3. Forfeiture of Units. If the Participant separates from service before the Vesting Date in circumstances other than as described in (a)-(d) below, any unvested Units will be forfeited. If the Participant separates from service due to Retirement, death or Disability before the Vesting Date as set forth in (a) below, the unvested Units will become fully vested and non-forfeitable, and shares will be issued on the date on which the Participant's Retirement, death or Disability occurs or as soon as administratively practicable (but in any event no later than 90 days) thereafter, subject in the case of the Participant's Retirement to Section 5 below. If the Participant separates from service before the Vesting Date in the circumstances set forth in (b) or (c) below, the number of Units set forth in this Award will be vested on a pro rata basis based on a fraction of the number of whole months from January 1 of the calendar year following the calendar year in which the Award Date occurs until the date of termination divided by 36, and shares will be issued on the otherwise applicable Vesting Date, subject to Section 5 below. Any remaining unvested Units will be forfeited as of the date of separation; except that a Participant who separates from service or whose employment is interrupted due to military service as provided in (c) below and who returns to employment with the Company upon cessation of such military service before the otherwise applicable Vesting Date will vest in any remaining unvested Units if employed on the Vesting Date. If the Participant separates from service before the Vesting Date in the circumstance set forth in (d) below, the unvested Units will become fully vested and non-forfeitable, and shares will be issued on the otherwise applicable Vesting Date, subject to Section 5 below.

(a) The Participant separates from service due to Retirement, death or Disability;

(b) The Participant separates from service due to Early Retirement;

(c) The Participant separates from service or his employment is interrupted due to military service; or

(d) Neither (a), (b) nor (c) applies, but the Committee determines that forfeiture should not occur because the Participant had an approved separation from service. The Committee will in its sole discretion determine whether or not to apply this provision.

4. Change in Control. Any unvested Units will become fully vested and non-forfeitable if, within 12 months after a Change in Control, the Participant separates from service due to Involuntary Termination. For this purpose, Involuntary Termination means that the Participant's employment is involuntarily terminated without Cause or the Participant terminates his employment for Good Reason. In either case, shares will be issued for such Units on the otherwise applicable Vesting Date, subject to Section 5 below.

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5. Six Month Delay for Specified Employees. With respect to a Participant who separates from service due to Retirement before the Vesting Date as set forth in Section 3(a) above, or who separates from service before the Vesting Date as set forth in Sections 3(b), (c) or (d) above or in Section 4, if such Participant is a "specified employee" (as defined in Section 409A(a)(2)(B)(i) of the Code and the generally applicable Internal Revenue Service guidance thereunder) on the date of his separation, then, notwithstanding anything in Sections 3 or 4 to the contrary, no shares will be issued for his Units until the date that is six months after the date of his separation (or until the date of his death, if earlier). Any shares which the Participant would otherwise have been entitled to receive during the first six months following the date of his separation will be issued instead on the date which is six months after the date of his separation (or on the date of his death, if earlier). Whether the Participant is a "specified employee" will be determined under guidelines established by the Company for this purpose.

6. Separation from Service Defined. References throughout this Agreement to the Participant's "separation from service" and variations thereof will have the meaning set forth in Section 1.409A-1(h) of the Treasury Regulations, as amended from time to time, applying the default terms thereof.

7. Forfeiture and Restitution. If during the period of the Participant's employment and two years thereafter, the Participant (1) becomes associated with, recruits or solicits customers or other employees of the Employer for, is employed by, renders services to, or owns any interest in (other than any non-substantial interest, as determined by the Committee) any business that is in competition with Markel or its Subsidiaries, (2) has his employment terminated by his Employer for Cause, or (3) engages in, or has engaged in, conduct which the Committee determines to be detrimental to the interests of Markel, the Committee may, in its sole discretion, (A) cancel this Award, and/or (B) require the Participant to repay by delivery of an equivalent number of shares any payment received under this Award within the previous two years. In addition, this Award shall be subject to any recoupment or clawback policy that is adopted by, or applicable to, the Company, pursuant to any requirement of law or any exchange listing requirement related to clawback or other recovery of incentive compensation.

8. Transfer Restrictions. The Participant's rights to the Units are not subject to sale, assignment, transfer, pledge, hypothecation or encumbrance.

9. Tax Withholding. Unless alternative arrangements satisfactory to the Company are made, the Company will withhold from the payment for the vested Units shares with a Fair Market Value equal to the minimum amount of any foreign, federal, state, or local income, employment or other taxes imposed on the payment required to be withheld by law. The Fair Market Value will be determined on the Vesting Date.

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10. Binding Effect. Subject to the limitations stated above, this Agreement will be binding upon and inure to the benefit of the Participant's legatees, distributees, and personal representatives and the successors of the Company.

11. Change in Capital Structure. The Units will be adjusted as the Committee determines is equitably required in the event of a dividend in the form of stock, spin-off, stock split-up, subdivision or consolidation of shares of Company Stock or other similar changes in capitalization.

12. Interpretation. This Agreement will be construed under and be governed by the laws of the Commonwealth of Virginia. THE UNITED STATES DISTRICT COURT FOR THE EASTERN DISTRICT OF VIRGINIA OR THE CIRCUIT COURT FOR THE COUNTY OF HENRICO WILL HAVE EXCLUSIVE JURISDICTION OVER ANY DISPUTES ARISING OUT OF OR RELATED TO THE PLAN OR THIS AGREEMENT.

13. Code Section 409A. This Agreement is intended to comply with the applicable requirements of Sections 409A(a)(2) through (4) of the Code, and will be interpreted to the extent context reasonably permits in accordance with this intent. The parties agree to modify this Agreement or the timing (but not the amount) of any payment to the extent necessary to comply with Section 409A of the Code and avoid application of any taxes, penalties, or interest thereunder. However, in the event that any amounts payable under this Agreement are subject to any taxes, penalties or interest under Section 409A of the Code or otherwise, the Participant will be solely liable for the payment thereof.

14. By accepting any benefits under this Agreement, Participant is accepting all the provisions hereof, including without limitation Section 7 hereof.

IN WITNESS WHEREOF, the Company has caused this Agreement to be signed as of the award date shown above.

MARKEL CORPORATION

By: _____________________________

Authorized Officer

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EX-10.4

Exhibit 10.4

MARKEL CORPORATION

RESTRICTED STOCK UNIT

AWARD AGREEMENT

AWARDED TO	AWARD DATE	VESTING SCHEDULE1
	For example: February XX, 2017	VESTING DATE February XX, 2020	PERCENTAGE OF UNITS

MARKEL CORPORATION (the "Company") grants you (the "Participant") __ restricted stock units ("Units"). Until the Vesting Date, except as specifically provided below, the Units are forfeitable and nontransferable. The Compensation Committee of the Company's Board of Directors (the "Committee") will administer this Agreement and any decision of the Committee will be final and conclusive. Capitalized terms not defined herein have the meanings provided in the Markel Corporation 2016 Equity Incentive Compensation Plan (the "Plan").

The terms of the award are:

1. Vesting For Units. If the Participant has not separated from service before the Vesting Date, the Units will become vested and non-forfeitable, and the Company will issue to the Participant for each vested Unit a share of Company Stock on that date (or such later date as may be elected by the Participant pursuant to a valid deferral election in accordance with procedures determined by the Company) or, in either case, as soon as administratively practicable (but in any event no later than 90 days) thereafter.

2. Forfeiture of Units. If the Participant separates from service before the Vesting Date in circumstances other than as described in this Section 2 any unvested Units will be forfeited. If the Participant separates from service due to death or Disability before the Vesting Date, the number of Units set forth in

¹If necessary or appropriate to ensure orderly administration of the Company's payroll and tax reporting obligations, the Company may accelerate vesting and payment of restricted stock units up to a maximum of thirty days before the date on which such restricted stock units would otherwise have vested and been paid.

-1-

this Award will become fully vested and non-forfeitable as of the date of the Participant's death or Disability, and shares will be issued on such date or as soon as administratively practicable (but in any event no later than 90 days) thereafter. If the Participant separates from service before the Vesting Date and the Committee determines that forfeiture should not occur because the Participant had an approved separation of service, the unvested Units will become fully vested and non-forfeitable, to the extent determined by the Committee, and shares will be issued on the otherwise applicable Vesting Date, subject to Section 4 below. The determination whether the Participant had an approved separation of service shall be completely in the Committee's discretion.

3. Change in Control. Any unvested Units will become fully vested and non-forfeitable if, within 12 months after a Change in Control, the Participant separates from service due to Involuntary Termination. For this purpose, Involuntary Termination means that the Participant's employment is involuntarily terminated without Cause or the Participant terminates his employment for Good Reason. In either case, shares will be issued for such Units on the otherwise applicable Vesting Date, subject to Section 4 below.

4. Six Month Delay for Specified Employees. With respect to a Participant who separates from service before the Vesting Date as set forth in Section 2 above, other than by reason of death or Disability, or in Section 3, if such Participant is a "specified employee" (as defined in Section 409A(a)(2)(B)(i) of the Code and the generally applicable Internal Revenue Service guidance thereunder) on the date of his separation, then, notwithstanding anything in Sections 2 or 3 to the contrary, no shares will be issued for his Units until the date that is six months after the date of his separation (or until the date of his death, if earlier). Any shares which the Participant would otherwise have been entitled to receive during the first six months following the date of his separation will be issued instead on the date which is six months after the date of his separation (or on the date of his death, if earlier). Whether the Participant is a "specified employee" will be determined under guidelines established by the Company for this purpose.

5. Separation from Service Defined. References throughout this Agreement to the Participant's "separation from service" and variations thereof will have the meaning set forth in Section 1.409A-1(h) of the Treasury Regulations, as amended from time to time, applying the default terms thereof.

6. Forfeiture and Restitution. If during the period of the Participant's employment and two years thereafter, the Participant (1) becomes associated with, recruits or solicits customers or other employees of the Employer for, is employed by, renders services to, or owns any interest in (other than any non-substantial interest, as determined by the Committee)

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any business that is in competition with Markel or its Subsidiaries, (2) has his employment terminated by his Employer for Cause, (3) discloses the terms of this Agreement to any person other than, on a confidential basis, to his spouse, attorneys, accountants or financial advisors or in response to a court order, or (4) engages in, or has engaged in, conduct which the Committee determines to be detrimental to the interests of Markel, the Committee may, in its sole discretion, (A) cancel this Award, and/or (B) require the Participant to repay by delivery of an equivalent number of shares any payment received under this Award within the previous two years. In addition, this Award shall be subject to any recoupment or clawback policy that is adopted by, or applicable to, the Company, pursuant to any requirement of law or any exchange listing requirement related to clawback or other recovery of incentive compensation. The provisions of this Section 6 are material consideration for this Award, which would not have been granted had Participant not agreed to them.

7. Transfer Restrictions. The Participant's rights to the Units are not subject to sale, assignment, transfer, pledge, hypothecation or encumbrance.

8. Tax Withholding. Unless alternative arrangements satisfactory to the Company are made, the Company will withhold from the payment for the vested Units shares with a Fair Market Value equal to the minimum amount of any foreign, federal, state, or local income, employment or other taxes imposed on the payment required to be withheld by law. The Fair Market Value will be determined on the Vesting Date.

9. Binding Effect. Subject to the limitations stated above, this Agreement will be binding upon and inure to the benefit of the Participant's legatees, distributees, and personal representatives and the successors of the Company.

10. Change in Capital Structure. The Units will be adjusted as the Committee determines is equitably required in the event of a dividend in the form of stock, spin-off, stock split-up, subdivision or consolidation of shares of Company Stock or other similar changes in capitalization.

11. Interpretation. This Agreement will be construed under and be governed by the laws of the Commonwealth of Virginia. THE UNITED STATES DISTRICT COURT FOR THE EASTERN DISTRICT OF VIRGINIA OR THE CIRCUIT COURT FOR THE COUNTY OF HENRICO WILL HAVE EXCLUSIVE JURISDICTION OVER ANY DISPUTES ARISING OUT OF OR RELATED TO THE PLAN OR THIS AGREEMENT.

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12. Code Section 409A. This Agreement is intended to comply with the applicable requirements of Sections 409A(a)(2) through (4) of the Code, and will be interpreted to the extent context reasonably permits in accordance with this intent. The parties agree to modify this Agreement or the timing (but not the amount) of any payment to the extent necessary to comply with Section 409A of the Code and avoid application of any taxes, penalties, or interest thereunder. However, in the event that any amounts payable under this Agreement are subject to any taxes, penalties or interest under Section 409A of the Code or otherwise, the Participant will be solely liable for the payment thereof.

13. By accepting any benefits under this Agreement, Participant is accepting all the provisions hereof, including without limitation Section 6 hereof.

IN WITNESS WHEREOF, the Company has caused this Agreement to be signed as of the award date shown above.

MARKEL CORPORATION

By: _____________________________

Authorized Officer

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EX-10.5

Exhibit 10.5

MARKEL CORPORATION

RESTRICTED STOCK UNIT

AWARD AGREEMENT

AWARDED TO	AWARD DATE	VESTING SCHEDULE1
	For example: February XX, 2017	VESTING DATE Feb 2018 Feb 2019 Feb 2020	PERCENTAGE OF UNITS

MARKEL CORPORATION (the "Company") grants you (the "Participant") ___ restricted stock units ("Units"). Until the applicable Vesting Date, except as specifically provided below, the Units are forfeitable and nontransferable. The Compensation Committee of the Company's Board of Directors (the "Committee") will administer this Agreement and any decision of the Committee will be final and conclusive. Capitalized terms not defined herein have the meanings provided in the Markel Corporation 2016 Equity Incentive Compensation Plan (the "Plan").

The terms of the award are:

1. Vesting For Units. If the Participant has not separated from service before the applicable Vesting Date, the Units associated with that Vesting Date will become vested and non-forfeitable, and the Company will issue to the Participant for each vested Unit a share of Company Stock on that date (or such later date as may be elected by the Participant pursuant to a valid deferral election in accordance with procedures determined by the Company) or, in either case, as soon as administratively practicable (but in any event no later than 90 days) thereafter.

¹ If necessary or appropriate to ensure orderly administration of the Company's payroll and tax reporting obligations, the Company may accelerate vesting and payment of restricted stock units up to a maximum of thirty days before the date on which such restricted stock units would otherwise have vested and been paid.

-1-

2. Forfeiture of Units. If the Participant separates from service before the final Vesting Date in circumstances other than as described in this Section 2, any unvested Units will be forfeited. If the Participant separates from service due to death or Disability before the final Vesting Date, the unvested Units will become fully vested and non-forfeitable, and shares will be issued on the date on which the Participant's death or Disability occurs or as soon as administratively practicable (but in any event no later than 90 days) thereafter. If the Participant separates from service before the final Vesting Date and the Committee determines that forfeiture should not occur because the Participant had an approved separation of service, the unvested Units will become fully vested and non-forfeitable, to the extent determined by the Committee, and shares will be issued on the otherwise applicable Vesting Date, subject to Section 4 below. The determination whether the Participant had an approved separation of service shall be completely in the Committee's discretion.

3. Change in Control. Any unvested Units will become fully vested and non-forfeitable if, within 12 months after a Change in Control, the Participant separates from service due to Involuntary Termination. For this purpose, Involuntary Termination means that the Participant's employment is involuntarily terminated without Cause or the Participant terminates his employment for Good Reason. In either case, shares will be issued for such Units on the otherwise applicable Vesting Date, subject to Section 4 below.

4. Six Month Delay for Specified Employees. With respect to a Participant who separates from service before the final Vesting Date as set forth in Section 2above, other than as a result of death or Disability, or in Section 3, if such Participant is a "specified employee" (as defined in Section 409A(a)(2)(B)(i) of the Code and the generally applicable Internal Revenue Service guidance thereunder) on the date of his separation, then, notwithstanding anything in Sections 2 or 3 to the contrary, no shares will be issued for his Units until the date that is six months after the date of his separation (or until the date of his death, if earlier). Any shares which the Participant would otherwise have been entitled to receive during the first six months following the date of his separation will be issued instead on the date which is six months after the date of his separation (or on the date of his death, if earlier). Whether the Participant is a "specified employee" will be determined under guidelines established by the Company for this purpose.

5. Separation from Service Defined. References throughout this Agreement to the Participant's "separation from service" and variations thereof will have the meaning set forth in Section 1.409A-1(h) of the Treasury

-2-

Regulations, as amended from time to time, applying the default terms thereof.

6. Forfeiture and Restitution. If during the period of the Participant's employment and two years thereafter, the Participant (1) becomes associated with, recruits or solicits customers or other employees of the Employer for, is employed by, renders services to, or owns any interest in (other than any non-substantial interest, as determined by the Committee) any business that is in competition with Markel or its Subsidiaries, (2) has his employment terminated by his Employer for Cause, (3) discloses the terms of this Agreement to any person other than, on a confidential basis, to his spouse, attorneys, accountants or financial advisors or in response to a court order, or (4) engages in, or has engaged in, conduct which the Committee determines to be detrimental to the interests of Markel, the Committee may, in its sole discretion, (A) cancel this Award, and/or (B) require the Participant to repay by delivery of an equivalent number of shares any payment received under this Award within the previous two years. In addition, this Award shall be subject to any recoupment or clawback policy that is adopted by, or applicable to, the Company, pursuant to any requirement of law or any exchange listing requirement related to clawback or other recovery of incentive compensation. The provisions of this Section 6 are material consideration for this Award, which would not have been granted had Participant not agreed to them.

7. Transfer Restrictions. The Participant's rights to the Units are not subject to sale, assignment, transfer, pledge, hypothecation or encumbrance.

8. Tax Withholding. Unless alternative arrangements satisfactory to the Company are made, the Company will withhold from the payment for the vested Units shares with a Fair Market Value equal to the minimum amount of any foreign, federal, state, or local income, employment or other taxes imposed on the payment required to be withheld by law. The Fair Market Value will be determined on the Vesting Date.

9. Binding Effect. Subject to the limitations stated above, this Agreement will be binding upon and inure to the benefit of the Participant's legatees, distributees, and personal representatives and the successors of the Company.

10. Change in Capital Structure. The Units will be adjusted as the Committee determines is equitably required in the event of a dividend in the form of stock, spin-off, stock split-up, subdivision or consolidation of shares of Company Stock or other similar changes in capitalization.

-3-

11. Interpretation. This Agreement will be construed under and be governed by the laws of the Commonwealth of Virginia. THE UNITED STATES DISTRICT COURT FOR THE EASTERN DISTRICT OF VIRGINIA OR THE CIRCUIT COURT FOR THE COUNTY OF HENRICO WILL HAVE EXCLUSIVE JURISDICTION OVER ANY DISPUTES ARISING OUT OF OR RELATED TO THE PLAN OR THIS AGREEMENT.

12. Code Section 409A. This Agreement is intended to comply with the applicable requirements of Sections 409A(a)(2) through (4) of the Code, and will be interpreted to the extent context reasonably permits in accordance with this intent. The parties agree to modify this Agreement or the timing (but not the amount) of any payment to the extent necessary to comply with Section 409A of the Code and avoid application of any taxes, penalties, or interest thereunder. However, in the event that any amounts payable under this Agreement are subject to any taxes, penalties or interest under Section 409A of the Code or otherwise, the Participant will be solely liable for the payment thereof.

13. By accepting any benefits under this Agreement, Participant is accepting all the provisions hereof, including without limitation Section 6 hereof.

IN WITNESS WHEREOF, the Company has caused this Agreement to be signed, as of the award date shown above.

MARKEL CORPORATION

By: _____________________________

Authorized Officer

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EX-10.6

Exhibit 10.6

MARKEL CORPORATION

RESTRICTED STOCK AWARD AGREEMENT

FOR OUTSIDE DIRECTORS

To:    ___________________

MARKEL CORPORATION (the "Company") hereby grants you (the "Director") ____shares of Restricted Stock (the "Shares") under the Markel Corporation 2016 Equity Incentive Compensation Plan (the "Plan"). Shares that have not yet vested under Section 1 below, or as otherwise specifically provided herein, are forfeitable and nontransferable. The Company's Outside Directors will administer this Award Agreement, and any decision of the Outside Directors will be final and conclusive. Capitalized terms not defined herein have the meanings provided in the Plan.

The terms of your Award are:

1. Vesting of Shares. Except as otherwise provided in this Award Agreement, the Shares will become vested and nonforfeitable one year from the date hereof (the "Vesting Date"), provided that the Director remains a member of the Board of Directors until the earlier of the Vesting Date or the Company's next annual meeting of shareholders after the date hereof.

2. Forfeiture of Shares. If the Director ceases to be a member of the Board of Directors other than by reason of death or Disability (as defined below) before the Vesting Date, the Shares will be forfeited; provided, that the Outside Directors may determine in their sole discretion that forfeiture should not occur, in whole or in part, because the Director had an approved termination of his or her service as a member of the Board of Directors and may in such circumstances allow the Shares to vest, in whole or in part, on such terms as the Outside Directors deem appropriate. If the Director dies or incurs a Disability, the Shares will become fully vested and non-forfeitable on the date of the Director's death or Disability.

3. Change of Control. Any unvested Shares will become fully vested and non-forfeitable if, after a Change in Control (as defined in the Plan) and before the Vesting Date, the Director ceases to be a member of the Board of Directors for any reason other than voluntary resignation.

4. Transfer Restrictions. The Shares are not subject to sale, assignment, transfer, pledge, hypothecation or encumbrance.

5. Binding Effect. Subject to the limitations stated above, this Award Agreement will be binding upon and inure to the benefit of the Director's legatees, distributees, and personal representatives and the successors of the Company.

-1-

6. Interpretation. This Award Agreement will be construed under and be governed by the laws of the Commonwealth of Virginia. THE UNITED STATES DISTRICT COURT FOR THE EASTERN DISTRICT OF VIRGINIA OR THE CIRCUIT COURT FOR THE COUNTY OF HENRICO, VIRGINIA SHALL HAVE EXCLUSIVE JURISDICTION OVER ANY DISPUTES ARISING OUT OF OR RELATED TO THE PLAN OR THIS AWARD AGREEMENT.

IN WITNESS WHEREOF, the Company has caused this Restricted Stock Award Agreement to be signed, effective as of the award date shown below.

	MARKEL CORPORATION
[Date of grant]
	By: _____________________________
	Alan I. Kirshner
	Authorized Officer

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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 quarterly report on Form 10-Q 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.

August 2, 2016	/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 quarterly report on Form 10-Q 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.

August 2, 2016	/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 Quarterly Report of Markel Corporation (the "Company") on Form 10-Q for the period ended June 30, 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)

August 2, 2016

EX-32.2

Exhibit 32.2

CERTIFICATION OF PRINCIPAL FINANCIAL OFFICER

FURNISHED PURSUANT TO 18 U.S.C. SECTION 1350

In connection with the Quarterly Report of Markel Corporation (the "Company") on Form 10-Q for the period ended June 30, 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)

August 2, 2016

XML

Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2016	Jul. 26, 2016
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2016
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q2
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		13,990,839

XML

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
ASSETS
Fixed maturities (amortized cost of $9,590,337 in 2016 and $9,038,158 in 2015)	$ 10,399,629	$ 9,394,468
Equity securities (cost of $2,390,184 in 2016 and $2,208,834 in 2015)	4,395,569	4,074,475
Short-term investments (estimated fair value approximates cost)	1,995,491	1,642,261
Total Investments	16,790,689	15,111,204
Cash and cash equivalents	2,007,938	2,630,009
Restricted cash and cash equivalents	353,900	440,132
Receivables	1,427,092	1,113,703
Reinsurance recoverable on unpaid losses	2,038,687	2,016,665
Reinsurance recoverable on paid losses	57,940	50,123
Deferred policy acquisition costs	415,700	352,756
Prepaid reinsurance premiums	362,865	322,362
Goodwill	1,167,861	1,167,844
Intangible assets	753,191	792,372
Other assets	959,765	941,945
Total Assets	26,335,628	24,939,115
LIABILITIES AND EQUITY
Unpaid losses and loss adjustment expenses	10,199,899	10,251,953
Life and annuity benefits	1,152,676	1,123,275
Unearned premiums	2,529,540	2,166,105
Payables to insurance and reinsurance companies	260,599	224,921
Senior long-term debt and other debt (estimated fair value of $2,842,000 in 2016 and $2,403,000 in 2015)	2,602,432	2,239,271
Other liabilities	1,078,708	1,030,023
Total Liabilities	17,823,854	17,035,548
Redeemable noncontrolling interests	66,201	62,958
Commitments and contingencies
Shareholders' equity:
Common stock	3,360,830	3,342,357
Retained earnings	3,355,262	3,137,285
Accumulated other comprehensive income	1,722,277	1,354,508
Total Shareholders' Equity	8,438,369	7,834,150
Noncontrolling interests	7,204	6,459
Total Equity	8,445,573	7,840,609
Total Liabilities and Equity	$ 26,335,628	$ 24,939,115

XML

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Fixed maturities, amortized cost	$ 9,590,337	$ 9,038,158
Equity securities, cost	2,390,184	2,208,834
Senior long-term debt and other debt, estimated fair value	$ 2,842,000	$ 2,403,000

XML

Consolidated Statements Of Income And Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
OPERATING REVENUES
Earned premiums	$ 950,859	$ 957,557	$ 1,908,545	$ 1,901,207
Net investment income	94,996	90,586	186,290	183,461
Other-than-temporary impairment losses	(3,675)	0	(12,080)	(5,092)
Net realized investment gains, excluding other-than-temporary impairment losses	20,916	6,105	50,500	16,768
Net realized investment gains	17,241	6,105	38,420	11,676
Other revenues	312,841	250,357	618,864	510,415
Total Operating Revenues	1,375,937	1,304,605	2,752,119	2,606,759
OPERATING EXPENSES
Losses and loss adjustment expenses	511,556	536,194	985,520	983,189
Underwriting, acquisition and insurance expenses	375,580	379,652	740,268	720,337
Amortization of intangible assets	17,204	16,949	34,464	31,589
Other expenses	277,909	242,236	553,002	473,237
Total Operating Expenses	1,182,249	1,175,031	2,313,254	2,208,352
Operating Income	193,688	129,574	438,865	398,407
Interest expense	33,697	29,288	64,538	58,600
Loss on early extinguishment of debt	44,100	0	44,100	0
Income Before Income Taxes	115,891	100,286	330,227	339,807
Income tax expense	35,218	7,833	85,908	53,348
Net Income	80,673	92,453	244,319	286,459
Net income attributable to noncontrolling interests	1,876	1,084	5,152	4,098
Net Income to Shareholders	78,797	91,369	239,167	282,361
OTHER COMPREHENSIVE INCOME (LOSS)
Net holding gains (losses) arising during the period	149,406	(230,142)	388,296	(109,120)
Change in unrealized other-than-temporary impairment losses on fixed maturities arising during the period	44	(48)	(23)	119
Reclassification adjustments for net gains included in net income	(10,567)	(4,984)	(23,550)	(14,037)
Change in net unrealized gains on investments, net of taxes	138,883	(235,174)	364,723	(123,038)
Change in foreign currency translation adjustments, net of taxes	(8,121)	10,385	2,208	(11,429)
Change in net actuarial pension loss, net of taxes	394	469	857	932
Total Other Comprehensive Income (Loss)	131,156	(224,320)	367,788	(133,535)
Comprehensive Income (Loss)	211,829	(131,867)	612,107	152,924
Comprehensive income attributable to noncontrolling interests	1,887	1,058	5,171	4,042
Comprehensive Income (Loss) to Shareholders	$ 209,942	$ (132,925)	$ 606,936	$ 148,882
NET INCOME PER SHARE
Basic (in dollars per share)	$ 5.44	$ 6.76	$ 16.65	$ 20.33
Diluted (in dollars per share)	$ 5.41	$ 6.72	$ 16.55	$ 20.21

XML

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, 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	$ 286,459	283,138	282,361		282,361	0	777	3,321
Other comprehensive income (loss)	(133,535)	(133,479)	(133,479)		0	(133,479)	0	(56)
Comprehensive Income (Loss)	152,924	149,659	148,882				777	3,265
Issuance of common stock		3,609	3,609	$ 3,609	0	0	0	0
Issuance of common stock, shares				15
Repurchase of common stock		(22,670)	(22,670)	$ 0	(22,670)	0	0	0
Repurchase of common stock, shares				(27)
Restricted stock units expensed		14,968	14,968	$ 14,968	0	0	0	0
Restricted stock units expensed, shares				0
Adjustment of redeemable noncontrolling interests		1,715	1,715	$ 0	1,715	0	0	(1,715)
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		2,040	1,995	$ 1,964	31	0	45	(2,482)
Other, shares				0
Balance at Jun. 30, 2015		7,749,876	7,741,870	$ 3,327,489	2,843,303	1,571,078	8,006
Balance, shares at Jun. 30, 2015				13,950
Balance, redeemable noncontrolling interests at Jun. 30, 2015								51,892
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	244,319	239,957	239,167		239,167	0	790	4,362
Other comprehensive income (loss)	367,788	367,769	367,769		0	367,769	0	19
Comprehensive Income (Loss)	612,107	607,726	606,936				790	4,381
Issuance of common stock		4,101	4,101	$ 4,101	0	0	0	0
Issuance of common stock, shares				48
Repurchase of common stock		(15,206)	(15,206)	$ 0	(15,206)	0	0	0
Repurchase of common stock, shares				(16)
Restricted stock units expensed		13,473	13,473	$ 13,473	0	0	0	0
Restricted stock units expensed, shares				0
Adjustment of redeemable noncontrolling interests		(5,981)	(5,981)	$ 0	(5,981)	0	0	5,981
Adjustment of redeemable noncontrolling interests, shares				0
Purchase of noncontrolling interest		899	899	$ 899	0	0	0	(3,977)
Purchase of noncontrolling interest, shares				0
Other		(48)	(3)	$ 0	(3)	0	(45)	(3,142)
Other, shares				0
Balance at Jun. 30, 2016	8,445,573	$ 8,445,573	$ 8,438,369	$ 3,360,830	$ 3,355,262	$ 1,722,277	$ 7,204
Balance, shares at Jun. 30, 2016				13,991
Balance, redeemable noncontrolling interests at Jun. 30, 2016	$ 66,201							$ 66,201

XML

Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
OPERATING ACTIVITIES
Net income	$ 244,319	$ 286,459
Adjustments to reconcile net income to net cash provided (used) by operating activities	(174,105)	(48,424)
Net Cash Provided By Operating Activities	70,214	238,035
INVESTING ACTIVITIES
Proceeds from sales of fixed maturities and equity securities	226,492	99,908
Proceeds from maturities, calls and prepayments of fixed maturities	471,907	810,934
Cost of fixed maturities and equity securities purchased	(1,324,755)	(556,934)
Net change in short-term investments	(348,335)	(595,971)
Proceeds from sales of equity method investments	6,479	21,365
Cost of equity method investments	(1,126)	(19,424)
Change in restricted cash and cash equivalents	90,003	(9,748)
Additions to property and equipment	(34,634)	(38,942)
Acquisitions, net of cash acquired	5,762	0
Other	(605)	489
Net Cash Used By Investing Activities	(920,336)	(288,323)
FINANCING ACTIVITIES
Additions to senior long-term debt and other debt	533,235	41,230
Repayment of senior long-term debt and other debt	(228,836)	(43,044)
Premiums and fees related to early extinguishment of debt	(43,691)	0
Repurchases of common stock	(15,206)	(22,670)
Issuance of common stock	4,101	3,609
Purchase of noncontrolling interests	(3,078)	(12,474)
Distributions to noncontrolling interests	(3,187)	(2,490)
Other	(13,428)	(12,454)
Net Cash Provided (Used) By Financing Activities	229,910	(48,293)
Effect of foreign currency rate changes on cash and cash equivalents	(1,859)	(8,644)
Decrease in cash and cash equivalents	(622,071)	(107,225)
Cash and cash equivalents at beginning of period	2,630,009	1,960,169
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 2,007,938	$ 1,852,944

XML

Summary Of Significant Accounting Policies

6 Months Ended

Jun. 30, 2016

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Summary of Significant Accounting Policies

a) Basis of Presentation. 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 and programs. 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.

The consolidated balance sheet as of June 30, 2016, the related consolidated statements of income and comprehensive income (loss) for the quarters and six months ended June 30, 2016 and 2015, and the consolidated statements of changes in equity and cash flows for the six months ended June 30, 2016 and 2015 are unaudited. In the opinion of management, all adjustments necessary for fair presentation of such consolidated financial statements have been included. Such adjustments consist only of normal, recurring items. Interim results are not necessarily indicative of results of operations for the entire year. The consolidated balance sheet as of December 31, 2015 was derived from Markel Corporation's audited annual consolidated financial statements.

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.

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. Actual results may differ materially from the estimates and assumptions used in preparing the consolidated financial statements.

The consolidated financial statements and notes are presented as permitted by Form 10-Q and do not contain certain information included in the Company's annual consolidated financial statements and notes. In addition to the policies set forth below, readers are urged to review the Company's 2015 Annual Report on Form 10-K for a more complete description of the Company's business and accounting policies.

b) Variable Interest Entities. The Company determines whether it has relationships with entities defined as VIEs in accordance with Accounting Standards Codification (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.

c) Revenue Recognition.

Investment Management and Performance Fees

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 ASC Topic 605, Revenue Recognition, such performance fee income is recorded at the conclusion of the contractual performance period, when all contingencies are resolved.

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Recent Accounting Pronouncements

6 Months Ended

Jun. 30, 2016

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

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 were reclassified from other assets to senior long-term debt and other debt as of December 31, 2015. 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, 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.

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. In August 2015, the FASB issued ASU No. 2015-14, Revenue from Contracts with Customers (Topic 606), Deferral of the Effective Date, which deferred the original effective date of ASU No. 2014-09 by one year. As a result, ASU No. 2014-09 becomes effective for the Company during the first quarter of 2018 and may be applied retrospectively or under a modified retrospective method where the cumulative effect is recognized at the date of initial application. Early application is permitted, but not before the first quarter of 2017. 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 and ASU No. 2016-12, Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients were issued in March, April and May 2016, respectively, as amendments to ASU No. 2014-09. These amendments will be evaluated and adopted in conjunction with ASU No. 2014-09. The Company is currently evaluating ASU No. 2014-09, and the related amendments, to determine the potential impact that adopting this standard will have on its consolidated financial statements. Adoption of this ASU is not expected to have a material impact on the Company's insurance operations, but may have a material impact on the Company's non-insurance operations.

In May 2015, the FASB issued ASU No. 2015-09, Financial Services-Insurance (Topic 944): Disclosures about Short-Duration Contracts. The ASU 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, on a net basis after 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. Interim period disclosures must include a tabular rollforward and related qualitative information for the liability for unpaid losses and loss adjustment expenses. Annual disclosures required by ASU No. 2015-09 become effective for the Company during 2016, with interim disclosures required beginning in the first quarter of 2017. The ASU must be applied retrospectively by providing comparative disclosures for each period presented. Early application is permitted. The adoption of this ASU will not have an impact on the Company's financial position, results of operations or cash flows, but will expand the nature and extent of its insurance contract disclosures, as described above.

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. Early adoption is permitted for certain provisions of the ASU. The Company is currently evaluating ASU No. 2016-01 to determine the potential 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 (loss), but will have a significant impact on the Company's results of operations as changes in fair value will be presented in net income rather than other comprehensive income (loss).

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). The ASU requires lessees to put 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 the 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. Early adoption is permitted. The Company is currently evaluating ASU No. 2016-02 to determine the potential impact that adopting this standard will have on the 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, 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.

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Acquisitions

6 Months Ended

Jun. 30, 2016

Business Combinations [Abstract]

Acquisitions

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. Total consideration for the CapTech acquisition was $60.6 million. As of December 31, 2015, the purchase price was preliminarily allocated to the acquired assets and liabilities based on the estimated fair values at the acquisition date. During the first quarter of 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. Results attributable to this acquisition are included with the Company's non-insurance operations, which are not included in a reportable segment.

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Investments

6 Months Ended

Jun. 30, 2016

Investments, Debt and Equity Securities [Abstract]

Investments

Investments

a)The following tables summarize the Company's available-for-sale investments.

	June 30, 2016
(dollars in thousands)	Amortized Cost		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses			Unrealized Other-Than- Temporary Impairment Losses			Estimated Fair Value
Fixed maturities:
U.S. Treasury securities and obligations of U.S. government agencies	$	674,801	$	25,489	$	(9	)	$	—		$	700,281
Obligations of states, municipalities and political subdivisions	4,193,114		370,264		(2,329		)	—			4,561,049
Foreign governments	1,349,640		233,884		(305		)	—			1,583,219
Commercial mortgage-backed securities	975,606		48,531		(533		)	—			1,023,604
Residential mortgage-backed securities	805,631		57,100		(529		)	(2,258		)	859,944
Asset-backed securities	28,232		127		(17		)	—			28,342
Corporate bonds	1,563,313		82,823		(1,293		)	(1,653		)	1,643,190
Total fixed maturities	9,590,337		818,218		(5,015		)	(3,911		)	10,399,629
Equity securities:
Insurance, banks and other financial institutions	835,144		769,505		(12,641		)	—			1,592,008
Industrial, consumer and all other	1,555,040		1,270,474		(21,953		)	—			2,803,561
Total equity securities	2,390,184		2,039,979		(34,594		)	—			4,395,569
Short-term investments	1,995,368		124		(1		)	—			1,995,491
Investments, available-for-sale	$	13,975,889	$	2,858,321	$	(39,610	)	$	(3,911	)	$	16,790,689

	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 maturities:
U.S. Treasury securities and obligations of U.S. government agencies	$	695,652	$	9,836	$	(4,781	)	$	—		$	700,707
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 securities	657,670		6,867		(4,999		)	—			659,538
Residential mortgage-backed securities	837,964		22,563		(4,022		)	(2,258		)	854,247
Asset-backed securities	36,462		15		(406		)	—			36,071
Corporate bonds	1,690,945		41,123		(16,209		)	(1,624		)	1,714,235
Total fixed maturities	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.

	June 30, 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 maturities:
U.S. Treasury securities and obligations of U.S. government agencies	$	7,537	$	(7	)	$	8,529	$	(2	)	$	16,066	$	(9	)
Obligations of states, municipalities and political subdivisions	2,789		(2		)	47,301		(2,327		)	50,090		(2,329		)
Foreign governments	42,255		(304		)	5,026		(1		)	47,281		(305		)
Commercial mortgage-backed securities	23,518		(142		)	63,738		(391		)	87,256		(533		)
Residential mortgage-backed securities	6,584		(2,304		)	104,340		(483		)	110,924		(2,787		)
Asset-backed securities	—		—			6,316		(17		)	6,316		(17		)
Corporate bonds	37,222		(1,664		)	104,194		(1,282		)	141,416		(2,946		)
Total fixed maturities	119,905		(4,423		)	339,444		(4,503		)	459,349		(8,926		)
Equity securities:
Insurance, banks and other financial institutions	77,737		(12,641		)	—		—			77,737		(12,641		)
Industrial, consumer and all other	191,170		(19,887		)	27,819		(2,066		)	218,989		(21,953		)
Total equity securities	268,907		(32,528		)	27,819		(2,066		)	296,726		(34,594		)
Short-term investments	99,977		(1		)	—		—			99,977		(1		)
Total	$	488,789	$	(36,952	)	$	367,263	$	(6,569	)	$	856,052	$	(43,521	)

At June 30, 2016, the Company held 216 securities with a total estimated fair value of $856.1 million and gross unrealized losses of $43.5 million. Of these 216 securities, 126 securities had been in a continuous unrealized loss position for one year or longer and had a total estimated fair value of $367.3 million and gross unrealized losses of $6.6 million. Of these securities, 119 securities were fixed maturities and seven were equity securities. The Company does not intend to sell or believe it will be required to sell these fixed maturities 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 maturities:
U.S. Treasury securities and obligations of U.S. government agencies	$	427,003	$	(3,648	)	$	92,552	$	(1,133	)	$	519,555	$	(4,781	)
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 securities	289,058		(3,600		)	95,843		(1,399		)	384,901		(4,999		)
Residential mortgage-backed securities	78,814		(2,858		)	137,100		(3,422		)	215,914		(6,280		)
Asset-backed securities	6,228		(54		)	24,315		(352		)	30,543		(406		)
Corporate bonds	470,694		(9,509		)	343,737		(8,324		)	814,431		(17,833		)
Total fixed maturities	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 maturities 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 maturities, 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 maturities 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 maturities at June 30, 2016 are shown below by contractual maturity.

(dollars in thousands)	Amortized Cost		Estimated Fair Value
Due in one year or less	$	720,305	$	726,444
Due after one year through five years	1,386,900		1,441,314
Due after five years through ten years	1,654,425		1,802,966
Due after ten years	4,019,238		4,517,015
	7,780,868		8,487,739
Commercial mortgage-backed securities	975,606		1,023,604
Residential mortgage-backed securities	805,631		859,944
Asset-backed securities	28,232		28,342
Total fixed maturities	$	9,590,337	$	10,399,629

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

	Quarter Ended June 30,						Six Months Ended June 30,
(dollars in thousands)	2016			2015			2016			2015
Interest:
Municipal bonds (tax-exempt)	$	22,563		$	24,293		$	44,485		$	50,145
Municipal bonds (taxable)	16,222			14,150			32,110			28,250
Other taxable bonds	36,959			34,013			72,278			69,151
Short-term investments, including overnight deposits	2,654			1,116			4,945			2,367
Dividends on equity securities	16,758			18,633			34,410			37,657
Income from equity method investments	3,921			1,712			3,668			3,056
Other	190			479			2,674			540
	99,267			94,396			194,570			191,166
Investment expenses	(4,271		)	(3,810		)	(8,280		)	(7,705		)
Net investment income	$	94,996		$	90,586		$	186,290		$	183,461

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

	Quarter Ended June 30,						Six Months Ended June 30,
(dollars in thousands)	2016			2015			2016			2015
Realized gains:
Sales of fixed maturities	$	699		$	770		$	967		$	2,338
Sales of equity securities	17,798			7,000			45,526			22,956
Other	353			1,739			773			2,413
Total realized gains	18,850			9,509			47,266			27,707
Realized losses:
Sales of fixed maturities	(142		)	(97		)	(555		)	(221		)
Sales of equity securities	(1,780		)	(113		)	(2,498		)	(272		)
Other-than-temporary impairments	(3,675		)	—			(12,080		)	(5,092		)
Other	(718		)	(16		)	(2,996		)	(227		)
Total realized losses	(6,315		)	(226		)	(18,129		)	(5,812		)
Gains (losses) on securities measured at fair value through net income	4,706			(3,178		)	9,283			(10,219		)
Net realized investment gains	$	17,241		$	6,105		$	38,420		$	11,676
Change in net unrealized gains on investments included in other comprehensive income (loss):
Fixed maturities	$	213,026		$	(286,551	)	$	452,982		$	(180,213	)
Equity securities	42,786			(64,792		)	139,744			(6,447		)
Short-term investments	32			11			(35		)	(9		)
Net increase (decrease)	$	255,844		$	(351,332	)	$	592,691		$	(186,669	)

For the quarter ended June 30, 2016, other-than-temporary impairment losses recognized in net income and included in net realized investment gains totaled $3.7 million and were attributable to 12 equity securities. The write downs for the quarter included $3.0 million related to equities in industrial, consumer, or other types of businesses and $0.6 million related to equities in insurance, banks, and other financial institutions. For the six months ended June 30, 2016, other-than-temporary impairment losses recognized in net income and included in net realized investment gains totaled $12.1 million and were attributable to 21 equity securities. The write downs for the six-month period included $10.8 million related to equities in industrial, consumer, or other types of businesses and $1.3 million related to equities in insurance, banks, and other financial institutions. For the six months ended June 30, 2015, other-than-temporary impairment losses recognized in net income and included in net realized investment gains totaled $5.1 million and were attributable to 10 equity securities. The write downs for the six-month period included $4.5 million related to equities in industrial, consumer, or other types of businesses and $0.6 million related to equities in insurance, banks, and other financial institutions.

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Fair Value Measurements

6 Months Ended

Jun. 30, 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 maturities, 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 maturities 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 and obligations of U.S. government agencies, 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 12, 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 and liabilities measured at fair value on a recurring basis by level within the fair value hierarchy.

	June 30, 2016
(dollars in thousands)	Level 1		Level 2		Level 3		Total
Assets:
Investments available-for-sale:
Fixed maturities:
U.S. Treasury securities and obligations of U.S. government agencies	$	—	$	700,281	$	—	$	700,281
Obligations of states, municipalities and political subdivisions	—		4,561,049		—		4,561,049
Foreign governments	—		1,583,219		—		1,583,219
Commercial mortgage-backed securities	—		1,023,604		—		1,023,604
Residential mortgage-backed securities	—		859,944		—		859,944
Asset-backed securities	—		28,342		—		28,342
Corporate bonds	—		1,643,190		—		1,643,190
Total fixed maturities	—		10,399,629		—		10,399,629
Equity securities:
Insurance, banks and other financial institutions	1,408,485		—		183,523		1,592,008
Industrial, consumer and all other	2,803,561		—		—		2,803,561
Total equity securities	4,212,046		—		183,523		4,395,569
Short-term investments	1,877,297		118,194		—		1,995,491
Total investments available-for-sale	$	6,089,343	$	10,517,823	$	183,523	$	16,790,689

	December 31, 2015
(dollars in thousands)	Level 1		Level 2		Level 3		Total
Assets:
Investments available-for-sale:
Fixed maturities:
U.S. Treasury securities and obligations of U.S. government agencies	$	—	$	700,707	$	—	$	700,707
Obligations of states, municipalities and political subdivisions	—		4,013,213		—		4,013,213
Foreign governments	—		1,416,457		—		1,416,457
Commercial mortgage-backed securities	—		659,538		—		659,538
Residential mortgage-backed securities	—		854,247		—		854,247
Asset-backed securities	—		36,071		—		36,071
Corporate bonds	—		1,714,235		—		1,714,235
Total fixed maturities	—		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.

	Quarter Ended June 30,					Six Months Ended June 30,
(dollars in thousands)	2016			2015		2016			2015
Equity securities, beginning of period	$	176,942		$	—	$	—		$	—
Purchases	25,000			—		195,250			—
Sales	(25,000		)	—		(25,000		)	—
Total gains included in:
Net income	6,581			—		13,273			—
Other comprehensive income (loss)	—			—		—			—
Transfers into Level 3	—			—		—			—
Transfers out of Level 3	—			—		—			—
Equity securities, end of period	$	183,523		$	—	$	183,523		$	—
Net unrealized gains included in net income relating to assets held at June 30, 2016 and 2015 (1)	$	6,581		$	—	$	13,273		$	—

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

There were no transfers into or out of Level 1 and Level 2 during the quarter and six months ended June 30, 2016 and 2015.

The Company did not have any assets or liabilities measured at fair value on a non-recurring basis during the six months ended June 30, 2016 and 2015.

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Segment Reporting Disclosures

6 Months Ended

Jun. 30, 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 placements written by the Company's insurance subsidiaries domiciled in the United States. The International Insurance segment includes all direct business and facultative 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 the 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 the Company's 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 Markel CATCo Investment Management Ltd. For purposes of segment reporting, the Company's non-insurance operations are not considered to be a reportable 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.

	Quarter Ended June 30, 2016
(dollars in thousands)	U.S. Insurance			International Insurance			Reinsurance			Other Insurance (Discontinued Lines)				Investing		Consolidated
Gross premium volume	$	689,468		$	318,581		$	269,604		$	(4	)		$	—	$	1,277,649
Net written premiums	579,233			244,636			226,681			(4		)		—		1,050,546
Earned premiums	533,328			203,052			214,514			(35		)		—		950,859
Losses and loss adjustment expenses:
Current accident year	(352,092		)	(146,453		)	(152,693		)	—				—		(651,238		)
Prior accident years	66,332			39,002			34,644			(296		)		—		139,682
Underwriting, acquisition and insurance expenses	(212,915		)	(96,562		)	(66,143		)	40				—		(375,580		)
Underwriting profit (loss)	34,653			(961		)	30,322			(291		)		—		63,723
Net investment income	—			—			—			—				94,996		94,996
Net realized investment gains	—			—			—			—				17,241		17,241
Other revenues (insurance)	958			609			—			446				—		2,013
Other expenses (insurance)	(684		)	(2,137		)	—			(7,199		)		—		(10,020		)
Segment profit (loss)	$	34,927		$	(2,489	)	$	30,322		$	(7,044	)		$	112,237	$	167,953
Other revenues (non-insurance)																310,828
Other expenses (non-insurance)																(267,889		)
Amortization of intangible assets																(17,204		)
Interest expense																(33,697		)
Loss on early extinguishment of debt																(44,100		)
Income before income taxes																$	115,891
U.S. GAAP combined ratio (1)	94		%	100		%	86		%	NM			(2)			93		%

	Quarter Ended June 30, 2015
(dollars in thousands)	U.S. Insurance			International Insurance			Reinsurance			Other Insurance (Discontinued Lines)				Investing		Consolidated
Gross premium volume	$	668,853		$	338,159		$	258,745		$	29			$	—	$	1,265,786
Net written premiums	554,638			264,129			215,520			57				—		1,034,344
Earned premiums	520,446			223,941			213,140			30				—		957,557
Losses and loss adjustment expenses:
Current accident year	(341,335		)	(168,896		)	(154,623		)	—				—		(664,854		)
Prior accident years	68,620			43,373			15,118			1,549				—		128,660
Underwriting, acquisition and insurance expenses	(211,856		)	(94,617		)	(73,170		)	(9		)		—		(379,652		)
Underwriting profit	35,875			3,801			465			1,570				—		41,711
Net investment income	—			—			—			—				90,586		90,586
Net realized investment gains	—			—			—			—				6,105		6,105
Other revenues (insurance)	2,203			915			469			350				—		3,937
Other expenses (insurance)	(1,284		)	(1,318		)	—			(3,348		)		—		(5,950		)
Segment profit (loss)	$	36,794		$	3,398		$	934		$	(1,428	)		$	96,691	$	136,389
Other revenues (non-insurance)																246,420
Other expenses (non-insurance)																(236,286		)
Amortization of intangible assets																(16,949		)
Interest expense																(29,288		)
Income before income taxes																$	100,286
U.S. GAAP combined ratio (1)	93		%	98		%	100		%	NM			(2)			96		%

⁽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.

	Six Months Ended June 30, 2016
(dollars in thousands)	U.S. Insurance			International Insurance			Reinsurance			Other Insurance (Discontinued Lines)				Investing		Consolidated
Gross premium volume	$	1,337,258		$	609,985		$	723,090		$	(21	)		$	—	$	2,670,312
Net written premiums	1,131,978			471,035			629,407			86				—		2,232,506
Earned premiums	1,065,796			418,397			424,133			219				—		1,908,545
Losses and loss adjustment expenses:
Current accident year	(668,425		)	(291,929		)	(283,169		)	—				—		(1,243,523		)
Prior accident years	104,986			68,654			71,005			13,358				—		258,003
Underwriting, acquisition and insurance expenses	(410,378		)	(185,168		)	(144,648		)	(74		)		—		(740,268		)
Underwriting profit	91,979			9,954			67,321			13,503				—		182,757
Net investment income	—			—			—			—				186,290		186,290
Net realized investment gains	—			—			—			—				38,420		38,420
Other revenues (insurance)	2,377			4,730			—			941				—		8,048
Other expenses (insurance)	(1,408		)	(3,691		)	—			(15,200		)		—		(20,299		)
Segment profit (loss)	$	92,948		$	10,993		$	67,321		$	(756	)		$	224,710	$	395,216
Other revenues (non-insurance)																610,816
Other expenses (non-insurance)																(532,703		)
Amortization of intangible assets																(34,464		)
Interest expense																(64,538		)
Loss on early extinguishment of debt																(44,100		)
Income before income taxes																$	330,227
U.S. GAAP combined ratio (1)	91		%	98		%	84		%	NM			(2)			90		%

	Six Months Ended June 30, 2015
(dollars in thousands)	U.S. Insurance			International Insurance			Reinsurance			Other Insurance (Discontinued Lines)				Investing		Consolidated
Gross premium volume	$	1,254,218		$	627,386		$	636,582		$	73			$	—	$	2,518,259
Net written premiums	1,050,807			486,837			531,732			398				—		2,069,774
Earned premiums	1,035,000			429,902			435,894			411				—		1,901,207
Losses and loss adjustment expenses:
Current accident year	(658,092		)	(317,740		)	(303,363		)	—				—		(1,279,195		)
Prior accident years	136,201			120,023			41,505			(1,723		)		—		296,006
Underwriting, acquisition and insurance expenses	(397,116		)	(173,411		)	(149,723		)	(87		)		—		(720,337		)
Underwriting profit (loss)	115,993			58,774			24,313			(1,399		)		—		197,681
Net investment income	—			—			—			—				183,461		183,461
Net realized investment gains	—			—			—			—				11,676		11,676
Other revenues (insurance)	3,605			6,302			892			327				—		11,126
Other expenses (insurance)	(2,189		)	(2,722		)	—			(10,697		)		—		(15,608		)
Segment profit (loss)	$	117,409		$	62,354		$	25,205		$	(11,769	)		$	195,137	$	388,336
Other revenues (non-insurance)																499,289
Other expenses (non-insurance)																(457,629		)
Amortization of intangible assets																(31,589		)
Interest expense																(58,600		)
Income before income taxes																$	339,807
U.S. GAAP combined ratio (1)	89		%	86		%	94		%	NM			(2)			90		%

⁽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 reconciles segment assets to the Company's consolidated balance sheets.

(dollars in thousands)	June 30, 2016		December 31, 2015
Segment assets:
Investing	$	18,976,263	$	18,056,947
Underwriting	5,822,696		5,385,126
Total segment assets	24,798,959		23,442,073
Non-insurance operations	1,536,669		1,497,042
Total assets	$	26,335,628	$	24,939,115

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Senior Long-Term Debt

6 Months Ended

Jun. 30, 2016

Debt Disclosure [Abstract]

Senior Long-Term Debt

Senior Long-Term Debt

On April 5, 2016, the Company issued $400 million of 5.0% unsecured senior notes due April 5, 2046. Net proceeds to the Company were $392.3 million. In April 2016, the Company used a portion of these proceeds to purchase $70.2 million of principal on its 7.35% Senior Notes due 2034 and $108.8 million of principal on its 7.125% 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 the April 2016 issuance to retire its 7.20% unsecured senior notes, when they come due April 14, 2017 ($90.6 million aggregate principal amount of those notes was outstanding at June 30, 2016), and the remainder for general corporate purposes.

On May 5, 2016, the Company issued an additional $100 million of 5.0% unsecured senior notes due April 5, 2046. Net proceeds to the Company were $100.8 million. The Company expects to use the proceeds for general corporate purposes.

In connection with the tender offer and purchase, we recognized a loss on early extinguishment of debt of $44.1 million during the quarter and six months ended June 30, 2016.

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Other Revenues And Other Expenses

6 Months Ended

Jun. 30, 2016

Other Income and Expenses [Abstract]

Other Revenues And Other Expenses

Other Revenues and Other Expenses

The following tables summarize the components of other revenues and other expenses.

	Quarter Ended June 30,
	2016				2015
(dollars in thousands)	Other Revenues		Other Expenses		Other Revenues		Other Expenses
Insurance:
Managing general agent operations	$	1,567	$	2,821	$	3,118	$	2,602
Life and annuity	446		7,199		350		3,348
Other	—		—		469		—
	2,013		10,020		3,937		5,950
Non-Insurance:
Markel Ventures: Manufacturing	193,152		159,227		174,141		168,580
Markel Ventures: Non-Manufacturing	104,602		91,685		65,412		63,013
Investment management	7,350		10,836		—		—
Other	5,724		6,141		6,867		4,693
	310,828		267,889		246,420		236,286
Total	$	312,841	$	277,909	$	250,357	$	242,236

	Six Months Ended June 30,
	2016				2015
(dollars in thousands)	Other Revenues		Other Expenses		Other Revenues		Other Expenses
Insurance:
Managing general agent operations	$	7,107	$	5,099	$	8,988	$	4,911
Life and annuity	941		15,200		327		10,697
Other	—		—		1,811		—
	8,048		20,299		11,126		15,608
Non-Insurance:
Markel Ventures: Manufacturing	385,843		319,593		351,903		320,380
Markel Ventures: Non-Manufacturing	198,430		180,118		133,093		126,843
Investment management	14,523		20,766		—		—
Other	12,020		12,226		14,293		10,406
	610,816		532,703		499,289		457,629
Total	$	618,864	$	553,002	$	510,415	$	473,237

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 companies is operated independently from one another, management aggregates financial results into two industry groups: manufacturing and non-manufacturing.

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Reinsurance

6 Months Ended

Jun. 30, 2016

Reinsurance Disclosures [Abstract]

Reinsurance

Reinsurance

The following tables summarize the effect of reinsurance and retrocessional reinsurance on premiums written and earned.

	Quarter Ended June 30,
	2016						2015
(dollars in thousands)	Written			Earned			Written			Earned
Direct	$	957,244		$	865,943		$	951,885		$	875,376
Assumed	320,405			295,868			313,901			304,324
Ceded	(227,103		)	(210,952		)	(231,442		)	(222,143		)
Net premiums	$	1,050,546		$	950,859		$	1,034,344		$	957,557

	Six Months Ended June 30,
	2016						2015
(dollars in thousands)	Written			Earned			Written			Earned
Direct	$	1,836,332		$	1,733,387		$	1,753,465		$	1,719,946
Assumed	833,980			585,931			764,794			617,159
Ceded	(437,806		)	(410,773		)	(448,485		)	(435,898		)
Net premiums	$	2,232,506		$	1,908,545		$	2,069,774		$	1,901,207

The percentage of ceded earned premiums to gross earned premiums was 18% and 19%, respectively, for the quarters and six months ended June 30, 2016 and 2015. The percentage of assumed earned premiums to net earned premiums was 31% and 32%, respectively, for the quarters and six months ended June 30, 2016 and 2015.

Incurred losses and loss adjustment expenses were net of reinsurance recoverables (ceded incurred losses and loss adjustment expenses) of $75.5 million and $143.3 million, respectively, for the quarters ended June 30, 2016 and 2015 and $206.1 million and $232.1 million, respectively, for the six months ended June 30, 2016 and 2015.

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Life And Annuity Benefits

6 Months Ended

Jun. 30, 2016

Liability for Future Policy Benefits [Abstract]

Life And Annuity Benefits

Life and Annuity Benefits

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.

Life and annuity benefits are also adjusted to the extent unrealized gains on the investments supporting the policy benefit reserves would result in a reserve deficiency if those gains were realized. During the quarter and six months ended June 30, 2016, the Company recognized a reserve deficiency resulting from a decrease in the market yield on the investment portfolio supporting the policy benefit reserves by increasing life and annuity benefits by $47.9 million and decreasing the change in net unrealized holding gains included in other comprehensive income by a corresponding amount. As of June 30, 2016, the cumulative adjustment to life and annuity benefits attributable to unrealized gains on the underlying investment portfolio totaled $47.9 million.

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Income Taxes

6 Months Ended

Jun. 30, 2016

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

The effective tax rate was 26% and 16% for the six months ended June 30, 2016 and 2015, respectively. For the six months ended June 30, 2016, the effective tax rate differs from the U.S. statutory tax rate of 35% primarily as a result of tax-exempt investment income. For the six months ended June 30, 2015, the effective tax rate differs from the U.S. statutory tax rate of 35% primarily as a result of foreign tax credits for foreign taxes paid and tax-exempt investment income. The Company's recognition of foreign tax credits in 2015 had a favorable impact on its effective tax rate for the six months ended June 30, 2015 of 12%. The increase in the effective tax rate in 2016 compared to 2015 was primarily due to the 2015 impact of foreign tax credits described above, partially offset by an increase in estimated annual earnings attributable to foreign operations that are taxed at a lower rate in 2016 compared to 2015.

During the first quarter of 2016, the Internal Revenue Service completed its examination of the Company’s 2012 federal income tax return. There were no adjustments to our income tax liabilities as a result of this examination.

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Variable Interest Entities

6 Months Ended

Jun. 30, 2016

Variable Interest Entities [Abstract]

Variable Interest Entities

Variable Interest Entities

In December 2015, the Company formed Markel CATCo Investment Management Ltd. (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. 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 ($25.2 million as of June 30, 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 June 30, 2016, total assets of the Markel Diversified Fund were $161.8 million and total liabilities were $63.9 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 $158.3 million, 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 June 30, 2016, total investment and insurance assets under management of MCIM for unconsolidated VIEs were $3.4 billion.

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Net Income Per Share

6 Months Ended

Jun. 30, 2016

Earnings Per Share [Abstract]

Net Income Per Share

Net Income per Share

Net income per share was determined by dividing adjusted net income to shareholders by the applicable weighted average shares outstanding.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 period.

	Quarter Ended June 30,					Six Months Ended June 30,
(in thousands, except per share amounts)	2016			2015		2016			2015
Net income to shareholders	$	78,797		$	91,369	$	239,167		$	282,361
Adjustment of redeemable noncontrolling interests	(2,529		)	3,062		(5,981		)	1,715
Adjusted net income to shareholders	$	76,268		$	94,431	$	233,186		$	284,076
Basic common shares outstanding	14,012			13,975		14,003			13,973
Dilutive potential common shares from conversion of options	4			9		5			10
Dilutive potential common shares from conversion of restricted stock	72			68		79			74
Diluted shares outstanding	14,088			14,052		14,087			14,057
Basic net income per share	$	5.44		$	6.76	$	16.65		$	20.33
Diluted net income per share	$	5.41		$	6.72	$	16.55		$	20.21

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Other Comprehensive Income (Loss)

6 Months Ended

Jun. 30, 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, for the six months ended June 30, 2016 and 2015.

(dollars in thousands)	Unrealized Holding Gains on Available-for-Sale Securities			Foreign Currency			Net Actuarial Pension Loss			Total
December 31, 2014	$	1,793,254		$	(43,491	)	$	(45,206	)	$	1,704,557
Other comprehensive loss before reclassifications	(109,001		)	(11,373		)	—			(120,374		)
Amounts reclassified from accumulated other comprehensive income	(14,037		)	—			932			(13,105		)
Total other comprehensive income (loss)	(123,038		)	(11,373		)	932			(133,479		)
June 30, 2015	$	1,670,216		$	(54,864	)	$	(44,274	)	$	1,571,078
December 31, 2015	$	1,472,762		$	(72,696	)	$	(45,558	)	$	1,354,508
Other comprehensive income before reclassifications	388,273			2,189			—			390,462
Amounts reclassified from accumulated other comprehensive income	(23,550		)	—			857			(22,693		)
Total other comprehensive income	364,723			2,189			857			367,769
June 30, 2016	$	1,837,485		$	(70,507	)	$	(44,701	)	$	1,722,277

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

	Quarter Ended June 30,						Six Months Ended June 30,
(dollars in thousands)	2016			2015			2016			2015
Change in net unrealized gains on investments:
Net holding gains (losses) arising during the period	$	71,381		$	(113,579	)	$	187,880		$	(57,997	)
Change in unrealized other-than-temporary impairment losses on fixed maturities arising during the period	9			(3		)	(6		)	38
Reclassification adjustments for net gains included in net income	(2,333		)	(2,576		)	(7,810		)	(5,672		)
Change in net unrealized gains on investments	69,057			(116,158		)	180,064			(63,631		)
Change in foreign currency translation adjustments	(1,618		)	1,872			(1,695		)	833
Change in net actuarial pension loss	86			117			188			233
Total	$	67,525		$	(114,169	)	$	178,557		$	(62,565	)

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

	Quarter Ended June 30,						Six Months Ended June 30,
(dollars in thousands)	2016			2015			2016			2015
Unrealized holding gains on available-for-sale securities:
Other-than-temporary impairment losses	$	(3,675	)	$	—		$	(12,080	)	$	(5,092	)
Net realized investment gains, excluding other-than-temporary impairment losses	16,575			7,560			43,440			24,801
Total before taxes	12,900			7,560			31,360			19,709
Income taxes	(2,333		)	(2,576		)	(7,810		)	(5,672		)
Reclassification of unrealized holding gains, net of taxes	$	10,567		$	4,984		$	23,550		$	14,037
Net actuarial pension loss:
Underwriting, acquisition and insurance expenses	$	(480	)	$	(586	)	$	(1,045	)	$	(1,165	)
Income taxes	86			117			188			233
Reclassification of net actuarial pension loss, net of taxes	$	(394	)	$	(469	)	$	(857	)	$	(932	)

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Contingencies

6 Months Ended

Jun. 30, 2016

Loss Contingency [Abstract]

Contingencies

Contingencies

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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Summary Of Significant Accounting Policies (Policy)

6 Months Ended

Jun. 30, 2016

Accounting Policies [Abstract]

Basis of Presentation

Basis of Presentation. 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 and programs. 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.

The consolidated balance sheet as of June 30, 2016, the related consolidated statements of income and comprehensive income (loss) for the quarters and six months ended June 30, 2016 and 2015, and the consolidated statements of changes in equity and cash flows for the six months ended June 30, 2016 and 2015 are unaudited. In the opinion of management, all adjustments necessary for fair presentation of such consolidated financial statements have been included. Such adjustments consist only of normal, recurring items. Interim results are not necessarily indicative of results of operations for the entire year. The consolidated balance sheet as of December 31, 2015 was derived from Markel Corporation's audited annual consolidated financial statements.

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.

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. Actual results may differ materially from the estimates and assumptions used in preparing the consolidated financial statements.

The consolidated financial statements and notes are presented as permitted by Form 10-Q and do not contain certain information included in the Company's annual consolidated financial statements and notes. In addition to the policies set forth below, readers are urged to review the Company's 2015 Annual Report on Form 10-K for a more complete description of the Company's business and accounting policies.

Variable Interest Entities

Variable Interest Entities. The Company determines whether it has relationships with entities defined as VIEs in accordance with Accounting Standards Codification (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.

Revenue Recognition

Revenue Recognition.

Investment Management and Performance Fees

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 ASC Topic 605, Revenue Recognition, such performance fee income is recorded at the conclusion of the contractual performance period, when all contingencies are resolved.

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Investments (Tables)

6 Months Ended

Jun. 30, 2016

Investments, Debt and Equity Securities [Abstract]

Available-For-Sale Investments

The following tables summarize the Company's available-for-sale investments.

	June 30, 2016
(dollars in thousands)	Amortized Cost		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses			Unrealized Other-Than- Temporary Impairment Losses			Estimated Fair Value
Fixed maturities:
U.S. Treasury securities and obligations of U.S. government agencies	$	674,801	$	25,489	$	(9	)	$	—		$	700,281
Obligations of states, municipalities and political subdivisions	4,193,114		370,264		(2,329		)	—			4,561,049
Foreign governments	1,349,640		233,884		(305		)	—			1,583,219
Commercial mortgage-backed securities	975,606		48,531		(533		)	—			1,023,604
Residential mortgage-backed securities	805,631		57,100		(529		)	(2,258		)	859,944
Asset-backed securities	28,232		127		(17		)	—			28,342
Corporate bonds	1,563,313		82,823		(1,293		)	(1,653		)	1,643,190
Total fixed maturities	9,590,337		818,218		(5,015		)	(3,911		)	10,399,629
Equity securities:
Insurance, banks and other financial institutions	835,144		769,505		(12,641		)	—			1,592,008
Industrial, consumer and all other	1,555,040		1,270,474		(21,953		)	—			2,803,561
Total equity securities	2,390,184		2,039,979		(34,594		)	—			4,395,569
Short-term investments	1,995,368		124		(1		)	—			1,995,491
Investments, available-for-sale	$	13,975,889	$	2,858,321	$	(39,610	)	$	(3,911	)	$	16,790,689

	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 maturities:
U.S. Treasury securities and obligations of U.S. government agencies	$	695,652	$	9,836	$	(4,781	)	$	—		$	700,707
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 securities	657,670		6,867		(4,999		)	—			659,538
Residential mortgage-backed securities	837,964		22,563		(4,022		)	(2,258		)	854,247
Asset-backed securities	36,462		15		(406		)	—			36,071
Corporate bonds	1,690,945		41,123		(16,209		)	(1,624		)	1,714,235
Total fixed maturities	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 maturities:
U.S. Treasury securities and obligations of U.S. government agencies	$	427,003	$	(3,648	)	$	92,552	$	(1,133	)	$	519,555	$	(4,781	)
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 securities	289,058		(3,600		)	95,843		(1,399		)	384,901		(4,999		)
Residential mortgage-backed securities	78,814		(2,858		)	137,100		(3,422		)	215,914		(6,280		)
Asset-backed securities	6,228		(54		)	24,315		(352		)	30,543		(406		)
Corporate bonds	470,694		(9,509		)	343,737		(8,324		)	814,431		(17,833		)
Total fixed maturities	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.

	June 30, 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 maturities:
U.S. Treasury securities and obligations of U.S. government agencies	$	7,537	$	(7	)	$	8,529	$	(2	)	$	16,066	$	(9	)
Obligations of states, municipalities and political subdivisions	2,789		(2		)	47,301		(2,327		)	50,090		(2,329		)
Foreign governments	42,255		(304		)	5,026		(1		)	47,281		(305		)
Commercial mortgage-backed securities	23,518		(142		)	63,738		(391		)	87,256		(533		)
Residential mortgage-backed securities	6,584		(2,304		)	104,340		(483		)	110,924		(2,787		)
Asset-backed securities	—		—			6,316		(17		)	6,316		(17		)
Corporate bonds	37,222		(1,664		)	104,194		(1,282		)	141,416		(2,946		)
Total fixed maturities	119,905		(4,423		)	339,444		(4,503		)	459,349		(8,926		)
Equity securities:
Insurance, banks and other financial institutions	77,737		(12,641		)	—		—			77,737		(12,641		)
Industrial, consumer and all other	191,170		(19,887		)	27,819		(2,066		)	218,989		(21,953		)
Total equity securities	268,907		(32,528		)	27,819		(2,066		)	296,726		(34,594		)
Short-term investments	99,977		(1		)	—		—			99,977		(1		)
Total	$	488,789	$	(36,952	)	$	367,263	$	(6,569	)	$	856,052	$	(43,521	)

Schedule Of Amortized Cost And Estimated Fair Value Of Fixed Maturities By Contractual Maturity Date

The amortized cost and estimated fair value of fixed maturities at June 30, 2016 are shown below by contractual maturity.

(dollars in thousands)	Amortized Cost		Estimated Fair Value
Due in one year or less	$	720,305	$	726,444
Due after one year through five years	1,386,900		1,441,314
Due after five years through ten years	1,654,425		1,802,966
Due after ten years	4,019,238		4,517,015
	7,780,868		8,487,739
Commercial mortgage-backed securities	975,606		1,023,604
Residential mortgage-backed securities	805,631		859,944
Asset-backed securities	28,232		28,342
Total fixed maturities	$	9,590,337	$	10,399,629

Components Of Net Investment Income

The following table presents the components of net investment income.

	Quarter Ended June 30,						Six Months Ended June 30,
(dollars in thousands)	2016			2015			2016			2015
Interest:
Municipal bonds (tax-exempt)	$	22,563		$	24,293		$	44,485		$	50,145
Municipal bonds (taxable)	16,222			14,150			32,110			28,250
Other taxable bonds	36,959			34,013			72,278			69,151
Short-term investments, including overnight deposits	2,654			1,116			4,945			2,367
Dividends on equity securities	16,758			18,633			34,410			37,657
Income from equity method investments	3,921			1,712			3,668			3,056
Other	190			479			2,674			540
	99,267			94,396			194,570			191,166
Investment expenses	(4,271		)	(3,810		)	(8,280		)	(7,705		)
Net investment income	$	94,996		$	90,586		$	186,290		$	183,461

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. 

	Quarter Ended June 30,						Six Months Ended June 30,
(dollars in thousands)	2016			2015			2016			2015
Realized gains:
Sales of fixed maturities	$	699		$	770		$	967		$	2,338
Sales of equity securities	17,798			7,000			45,526			22,956
Other	353			1,739			773			2,413
Total realized gains	18,850			9,509			47,266			27,707
Realized losses:
Sales of fixed maturities	(142		)	(97		)	(555		)	(221		)
Sales of equity securities	(1,780		)	(113		)	(2,498		)	(272		)
Other-than-temporary impairments	(3,675		)	—			(12,080		)	(5,092		)
Other	(718		)	(16		)	(2,996		)	(227		)
Total realized losses	(6,315		)	(226		)	(18,129		)	(5,812		)
Gains (losses) on securities measured at fair value through net income	4,706			(3,178		)	9,283			(10,219		)
Net realized investment gains	$	17,241		$	6,105		$	38,420		$	11,676
Change in net unrealized gains on investments included in other comprehensive income (loss):
Fixed maturities	$	213,026		$	(286,551	)	$	452,982		$	(180,213	)
Equity securities	42,786			(64,792		)	139,744			(6,447		)
Short-term investments	32			11			(35		)	(9		)
Net increase (decrease)	$	255,844		$	(351,332	)	$	592,691		$	(186,669	)

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Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2016

Fair Value Disclosures [Abstract]

Balances Of Assets And Liabilities Measured At Fair Value On A Recurring Basis

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

	June 30, 2016
(dollars in thousands)	Level 1		Level 2		Level 3		Total
Assets:
Investments available-for-sale:
Fixed maturities:
U.S. Treasury securities and obligations of U.S. government agencies	$	—	$	700,281	$	—	$	700,281
Obligations of states, municipalities and political subdivisions	—		4,561,049		—		4,561,049
Foreign governments	—		1,583,219		—		1,583,219
Commercial mortgage-backed securities	—		1,023,604		—		1,023,604
Residential mortgage-backed securities	—		859,944		—		859,944
Asset-backed securities	—		28,342		—		28,342
Corporate bonds	—		1,643,190		—		1,643,190
Total fixed maturities	—		10,399,629		—		10,399,629
Equity securities:
Insurance, banks and other financial institutions	1,408,485		—		183,523		1,592,008
Industrial, consumer and all other	2,803,561		—		—		2,803,561
Total equity securities	4,212,046		—		183,523		4,395,569
Short-term investments	1,877,297		118,194		—		1,995,491
Total investments available-for-sale	$	6,089,343	$	10,517,823	$	183,523	$	16,790,689

	December 31, 2015
(dollars in thousands)	Level 1		Level 2		Level 3		Total
Assets:
Investments available-for-sale:
Fixed maturities:
U.S. Treasury securities and obligations of U.S. government agencies	$	—	$	700,707	$	—	$	700,707
Obligations of states, municipalities and political subdivisions	—		4,013,213		—		4,013,213
Foreign governments	—		1,416,457		—		1,416,457
Commercial mortgage-backed securities	—		659,538		—		659,538
Residential mortgage-backed securities	—		854,247		—		854,247
Asset-backed securities	—		36,071		—		36,071
Corporate bonds	—		1,714,235		—		1,714,235
Total fixed maturities	—		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.

	Quarter Ended June 30,					Six Months Ended June 30,
(dollars in thousands)	2016			2015		2016			2015
Equity securities, beginning of period	$	176,942		$	—	$	—		$	—
Purchases	25,000			—		195,250			—
Sales	(25,000		)	—		(25,000		)	—
Total gains included in:
Net income	6,581			—		13,273			—
Other comprehensive income (loss)	—			—		—			—
Transfers into Level 3	—			—		—			—
Transfers out of Level 3	—			—		—			—
Equity securities, end of period	$	183,523		$	—	$	183,523		$	—
Net unrealized gains included in net income relating to assets held at June 30, 2016 and 2015 (1)	$	6,581		$	—	$	13,273		$	—

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

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Segment Reporting Disclosures (Tables)

6 Months Ended

Jun. 30, 2016

Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]

Company's Segment Disclosures

The following tables summarize the Company's segment disclosures.

	Quarter Ended June 30, 2016
(dollars in thousands)	U.S. Insurance			International Insurance			Reinsurance			Other Insurance (Discontinued Lines)				Investing		Consolidated
Gross premium volume	$	689,468		$	318,581		$	269,604		$	(4	)		$	—	$	1,277,649
Net written premiums	579,233			244,636			226,681			(4		)		—		1,050,546
Earned premiums	533,328			203,052			214,514			(35		)		—		950,859
Losses and loss adjustment expenses:
Current accident year	(352,092		)	(146,453		)	(152,693		)	—				—		(651,238		)
Prior accident years	66,332			39,002			34,644			(296		)		—		139,682
Underwriting, acquisition and insurance expenses	(212,915		)	(96,562		)	(66,143		)	40				—		(375,580		)
Underwriting profit (loss)	34,653			(961		)	30,322			(291		)		—		63,723
Net investment income	—			—			—			—				94,996		94,996
Net realized investment gains	—			—			—			—				17,241		17,241
Other revenues (insurance)	958			609			—			446				—		2,013
Other expenses (insurance)	(684		)	(2,137		)	—			(7,199		)		—		(10,020		)
Segment profit (loss)	$	34,927		$	(2,489	)	$	30,322		$	(7,044	)		$	112,237	$	167,953
Other revenues (non-insurance)																310,828
Other expenses (non-insurance)																(267,889		)
Amortization of intangible assets																(17,204		)
Interest expense																(33,697		)
Loss on early extinguishment of debt																(44,100		)
Income before income taxes																$	115,891
U.S. GAAP combined ratio (1)	94		%	100		%	86		%	NM			(2)			93		%

	Quarter Ended June 30, 2015
(dollars in thousands)	U.S. Insurance			International Insurance			Reinsurance			Other Insurance (Discontinued Lines)				Investing		Consolidated
Gross premium volume	$	668,853		$	338,159		$	258,745		$	29			$	—	$	1,265,786
Net written premiums	554,638			264,129			215,520			57				—		1,034,344
Earned premiums	520,446			223,941			213,140			30				—		957,557
Losses and loss adjustment expenses:
Current accident year	(341,335		)	(168,896		)	(154,623		)	—				—		(664,854		)
Prior accident years	68,620			43,373			15,118			1,549				—		128,660
Underwriting, acquisition and insurance expenses	(211,856		)	(94,617		)	(73,170		)	(9		)		—		(379,652		)
Underwriting profit	35,875			3,801			465			1,570				—		41,711
Net investment income	—			—			—			—				90,586		90,586
Net realized investment gains	—			—			—			—				6,105		6,105
Other revenues (insurance)	2,203			915			469			350				—		3,937
Other expenses (insurance)	(1,284		)	(1,318		)	—			(3,348		)		—		(5,950		)
Segment profit (loss)	$	36,794		$	3,398		$	934		$	(1,428	)		$	96,691	$	136,389
Other revenues (non-insurance)																246,420
Other expenses (non-insurance)																(236,286		)
Amortization of intangible assets																(16,949		)
Interest expense																(29,288		)
Income before income taxes																$	100,286
U.S. GAAP combined ratio (1)	93		%	98		%	100		%	NM			(2)			96		%

⁽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.

	Six Months Ended June 30, 2016
(dollars in thousands)	U.S. Insurance			International Insurance			Reinsurance			Other Insurance (Discontinued Lines)				Investing		Consolidated
Gross premium volume	$	1,337,258		$	609,985		$	723,090		$	(21	)		$	—	$	2,670,312
Net written premiums	1,131,978			471,035			629,407			86				—		2,232,506
Earned premiums	1,065,796			418,397			424,133			219				—		1,908,545
Losses and loss adjustment expenses:
Current accident year	(668,425		)	(291,929		)	(283,169		)	—				—		(1,243,523		)
Prior accident years	104,986			68,654			71,005			13,358				—		258,003
Underwriting, acquisition and insurance expenses	(410,378		)	(185,168		)	(144,648		)	(74		)		—		(740,268		)
Underwriting profit	91,979			9,954			67,321			13,503				—		182,757
Net investment income	—			—			—			—				186,290		186,290
Net realized investment gains	—			—			—			—				38,420		38,420
Other revenues (insurance)	2,377			4,730			—			941				—		8,048
Other expenses (insurance)	(1,408		)	(3,691		)	—			(15,200		)		—		(20,299		)
Segment profit (loss)	$	92,948		$	10,993		$	67,321		$	(756	)		$	224,710	$	395,216
Other revenues (non-insurance)																610,816
Other expenses (non-insurance)																(532,703		)
Amortization of intangible assets																(34,464		)
Interest expense																(64,538		)
Loss on early extinguishment of debt																(44,100		)
Income before income taxes																$	330,227
U.S. GAAP combined ratio (1)	91		%	98		%	84		%	NM			(2)			90		%

	Six Months Ended June 30, 2015
(dollars in thousands)	U.S. Insurance			International Insurance			Reinsurance			Other Insurance (Discontinued Lines)				Investing		Consolidated
Gross premium volume	$	1,254,218		$	627,386		$	636,582		$	73			$	—	$	2,518,259
Net written premiums	1,050,807			486,837			531,732			398				—		2,069,774
Earned premiums	1,035,000			429,902			435,894			411				—		1,901,207
Losses and loss adjustment expenses:
Current accident year	(658,092		)	(317,740		)	(303,363		)	—				—		(1,279,195		)
Prior accident years	136,201			120,023			41,505			(1,723		)		—		296,006
Underwriting, acquisition and insurance expenses	(397,116		)	(173,411		)	(149,723		)	(87		)		—		(720,337		)
Underwriting profit (loss)	115,993			58,774			24,313			(1,399		)		—		197,681
Net investment income	—			—			—			—				183,461		183,461
Net realized investment gains	—			—			—			—				11,676		11,676
Other revenues (insurance)	3,605			6,302			892			327				—		11,126
Other expenses (insurance)	(2,189		)	(2,722		)	—			(10,697		)		—		(15,608		)
Segment profit (loss)	$	117,409		$	62,354		$	25,205		$	(11,769	)		$	195,137	$	388,336
Other revenues (non-insurance)																499,289
Other expenses (non-insurance)																(457,629		)
Amortization of intangible assets																(31,589		)
Interest expense																(58,600		)
Income before income taxes																$	339,807
U.S. GAAP combined ratio (1)	89		%	86		%	94		%	NM			(2)			90		%

⁽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.

Reconciliation Of Segment Assets To The Company's Consolidated Balance Sheets

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

(dollars in thousands)	June 30, 2016		December 31, 2015
Segment assets:
Investing	$	18,976,263	$	18,056,947
Underwriting	5,822,696		5,385,126
Total segment assets	24,798,959		23,442,073
Non-insurance operations	1,536,669		1,497,042
Total assets	$	26,335,628	$	24,939,115

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Other Revenues And Other Expenses (Tables)

6 Months Ended

Jun. 30, 2016

Other Income and Expenses [Abstract]

Summary Of Other Revenues And Other Expenses By Component

The following tables summarize the components of other revenues and other expenses.

	Quarter Ended June 30,
	2016				2015
(dollars in thousands)	Other Revenues		Other Expenses		Other Revenues		Other Expenses
Insurance:
Managing general agent operations	$	1,567	$	2,821	$	3,118	$	2,602
Life and annuity	446		7,199		350		3,348
Other	—		—		469		—
	2,013		10,020		3,937		5,950
Non-Insurance:
Markel Ventures: Manufacturing	193,152		159,227		174,141		168,580
Markel Ventures: Non-Manufacturing	104,602		91,685		65,412		63,013
Investment management	7,350		10,836		—		—
Other	5,724		6,141		6,867		4,693
	310,828		267,889		246,420		236,286
Total	$	312,841	$	277,909	$	250,357	$	242,236

	Six Months Ended June 30,
	2016				2015
(dollars in thousands)	Other Revenues		Other Expenses		Other Revenues		Other Expenses
Insurance:
Managing general agent operations	$	7,107	$	5,099	$	8,988	$	4,911
Life and annuity	941		15,200		327		10,697
Other	—		—		1,811		—
	8,048		20,299		11,126		15,608
Non-Insurance:
Markel Ventures: Manufacturing	385,843		319,593		351,903		320,380
Markel Ventures: Non-Manufacturing	198,430		180,118		133,093		126,843
Investment management	14,523		20,766		—		—
Other	12,020		12,226		14,293		10,406
	610,816		532,703		499,289		457,629
Total	$	618,864	$	553,002	$	510,415	$	473,237

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Reinsurance (Tables)

6 Months Ended

Jun. 30, 2016

Reinsurance Disclosures [Abstract]

Effect Of Reinsurance And Retrocessional Reinsurance On Premiums Written And Earned

The following tables summarize the effect of reinsurance and retrocessional reinsurance on premiums written and earned.

	Quarter Ended June 30,
	2016						2015
(dollars in thousands)	Written			Earned			Written			Earned
Direct	$	957,244		$	865,943		$	951,885		$	875,376
Assumed	320,405			295,868			313,901			304,324
Ceded	(227,103		)	(210,952		)	(231,442		)	(222,143		)
Net premiums	$	1,050,546		$	950,859		$	1,034,344		$	957,557

	Six Months Ended June 30,
	2016						2015
(dollars in thousands)	Written			Earned			Written			Earned
Direct	$	1,836,332		$	1,733,387		$	1,753,465		$	1,719,946
Assumed	833,980			585,931			764,794			617,159
Ceded	(437,806		)	(410,773		)	(448,485		)	(435,898		)
Net premiums	$	2,232,506		$	1,908,545		$	2,069,774		$	1,901,207

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Net Income Per Share (Tables)

6 Months Ended

Jun. 30, 2016

Earnings Per Share [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.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 period.

	Quarter Ended June 30,					Six Months Ended June 30,
(in thousands, except per share amounts)	2016			2015		2016			2015
Net income to shareholders	$	78,797		$	91,369	$	239,167		$	282,361
Adjustment of redeemable noncontrolling interests	(2,529		)	3,062		(5,981		)	1,715
Adjusted net income to shareholders	$	76,268		$	94,431	$	233,186		$	284,076
Basic common shares outstanding	14,012			13,975		14,003			13,973
Dilutive potential common shares from conversion of options	4			9		5			10
Dilutive potential common shares from conversion of restricted stock	72			68		79			74
Diluted shares outstanding	14,088			14,052		14,087			14,057
Basic net income per share	$	5.44		$	6.76	$	16.65		$	20.33
Diluted net income per share	$	5.41		$	6.72	$	16.55		$	20.21

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Other Comprehensive Income (Loss) (Tables)

6 Months Ended

Jun. 30, 2016

Other Comprehensive Income (Loss), Tax [Abstract]

Change In Accumulated Other Comprehensive Income By Component, Net Of Taxes And Noncontrolling Interest

The following table presents the change in accumulated other comprehensive income by component, net of taxes and noncontrolling interests, for the six months ended June 30, 2016 and 2015.

(dollars in thousands)	Unrealized Holding Gains on Available-for-Sale Securities			Foreign Currency			Net Actuarial Pension Loss			Total
December 31, 2014	$	1,793,254		$	(43,491	)	$	(45,206	)	$	1,704,557
Other comprehensive loss before reclassifications	(109,001		)	(11,373		)	—			(120,374		)
Amounts reclassified from accumulated other comprehensive income	(14,037		)	—			932			(13,105		)
Total other comprehensive income (loss)	(123,038		)	(11,373		)	932			(133,479		)
June 30, 2015	$	1,670,216		$	(54,864	)	$	(44,274	)	$	1,571,078
December 31, 2015	$	1,472,762		$	(72,696	)	$	(45,558	)	$	1,354,508
Other comprehensive income before reclassifications	388,273			2,189			—			390,462
Amounts reclassified from accumulated other comprehensive income	(23,550		)	—			857			(22,693		)
Total other comprehensive income	364,723			2,189			857			367,769
June 30, 2016	$	1,837,485		$	(70,507	)	$	(44,701	)	$	1,722,277

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).

	Quarter Ended June 30,						Six Months Ended June 30,
(dollars in thousands)	2016			2015			2016			2015
Change in net unrealized gains on investments:
Net holding gains (losses) arising during the period	$	71,381		$	(113,579	)	$	187,880		$	(57,997	)
Change in unrealized other-than-temporary impairment losses on fixed maturities arising during the period	9			(3		)	(6		)	38
Reclassification adjustments for net gains included in net income	(2,333		)	(2,576		)	(7,810		)	(5,672		)
Change in net unrealized gains on investments	69,057			(116,158		)	180,064			(63,631		)
Change in foreign currency translation adjustments	(1,618		)	1,872			(1,695		)	833
Change in net actuarial pension loss	86			117			188			233
Total	$	67,525		$	(114,169	)	$	178,557		$	(62,565	)

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.

	Quarter Ended June 30,						Six Months Ended June 30,
(dollars in thousands)	2016			2015			2016			2015
Unrealized holding gains on available-for-sale securities:
Other-than-temporary impairment losses	$	(3,675	)	$	—		$	(12,080	)	$	(5,092	)
Net realized investment gains, excluding other-than-temporary impairment losses	16,575			7,560			43,440			24,801
Total before taxes	12,900			7,560			31,360			19,709
Income taxes	(2,333		)	(2,576		)	(7,810		)	(5,672		)
Reclassification of unrealized holding gains, net of taxes	$	10,567		$	4,984		$	23,550		$	14,037
Net actuarial pension loss:
Underwriting, acquisition and insurance expenses	$	(480	)	$	(586	)	$	(1,045	)	$	(1,165	)
Income taxes	86			117			188			233
Reclassification of net actuarial pension loss, net of taxes	$	(394	)	$	(469	)	$	(857	)	$	(932	)

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Recent Accounting Pronouncements (Narrative) (Details) $ in Millions	Dec. 31, 2015 USD ($)
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	$ 2.2

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Acquisitions (Narrative) (Details) - CapTech Ventures Inc [Member] - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Dec. 31, 2015	Mar. 31, 2016
Business Acquisition [Line Items]
Percentage acquired	80.00%
Total consideration	$ 60.6
Material adjustments to the provisional estimates recorded		$ 0.0

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Investments (Narrative) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016 USD ($) securities	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) securities	Jun. 30, 2015 USD ($) securities	Dec. 31, 2015 USD ($) securities
Schedule of Investments [Line Items]
Available-for-sale securities in unrealized loss position, number of positions | securities	216		216		659
Available-for-sale securities, estimated fair value	$ 856,052		$ 856,052		$ 2,843,837
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses	$ (43,521)		$ (43,521)		$ (95,896)
Number of available-for-sale securities positions in a continuous unrealized loss position for one year or longer at period end | securities	126		126		271
Available-for-sale securities, estimated fair value, 12 months or longer	$ 367,263		$ 367,263		$ 813,147
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, 12 months or longer	(6,569)		(6,569)		(19,842)
Other-than-temporary impairment losses recognized in net income	(3,675)	$ 0	(12,080)	$ (5,092)
Fixed Maturities [Member]
Schedule of Investments [Line Items]
Available-for-sale securities, estimated fair value	459,349		459,349		2,296,480
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses	$ (8,926)		$ (8,926)		$ (44,205)
Number of available-for-sale securities positions in a continuous unrealized loss position for one year or longer at period end | securities	119		119		264
Available-for-sale securities, estimated fair value, 12 months or longer	$ 339,444		$ 339,444		$ 803,993
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, 12 months or longer	(4,503)		(4,503)		(19,423)
Equity Securities [Member]
Schedule of Investments [Line Items]
Available-for-sale securities, estimated fair value	296,726		296,726		417,884
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses	$ (34,594)		$ (34,594)		$ (51,682)
Number of available-for-sale securities positions in a continuous unrealized loss position for one year or longer at period end | securities	7		7		7
Available-for-sale securities, estimated fair value, 12 months or longer	$ 27,819		$ 27,819		$ 9,154
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, 12 months or longer	(2,066)		(2,066)		(419)
Other-than-temporary impairment losses recognized in net income	$ (3,700)		$ (12,100)	$ (5,100)
Other than temporary impairment losses recognized in earnings, number of investment positions | securities	12		21	10
Industrial, Consumer And All Other [Member]
Schedule of Investments [Line Items]
Available-for-sale securities, estimated fair value	$ 218,989		$ 218,989		347,764
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses	(21,953)		(21,953)		(45,131)
Available-for-sale securities, estimated fair value, 12 months or longer	27,819		27,819		2,907
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, 12 months or longer	(2,066)		(2,066)		(252)
Other-than-temporary impairment losses recognized in net income	(3,000)		(10,800)	$ (4,500)
Insurance, Banks And Other Financial Institutions [Member]
Schedule of Investments [Line Items]
Available-for-sale securities, estimated fair value	77,737		77,737		70,120
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses	(12,641)		(12,641)		(6,551)
Available-for-sale securities, estimated fair value, 12 months or longer	0		0		6,247
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, 12 months or longer	0		0		$ (167)
Other-than-temporary impairment losses recognized in net income	$ (600)		$ (1,300)	$ (600)

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Investments (Available-For-Sale Investments) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale investments, amortized cost	$ 13,975,889	$ 12,889,095
Available-for-sale investments, gross unrealized holding gains	2,858,321	2,318,005
Available-for-sale investments, gross unrealized holding losses	(39,610)	(92,014)
Available-for-sale investments, unrealized other-than-temporary impairment losses	(3,911)	(3,882)
Available-for-sale investments, estimated fair value	16,790,689	15,111,204
U.S. Treasury Securities And Obligations Of U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale investments, amortized cost	674,801	695,652
Available-for-sale investments, gross unrealized holding gains	25,489	9,836
Available-for-sale investments, gross unrealized holding losses	(9)	(4,781)
Available-for-sale investments, unrealized other-than-temporary impairment losses	0	0
Available-for-sale investments, estimated fair value	700,281	700,707
Obligations Of States, Municipalities And Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale investments, amortized cost	4,193,114	3,817,136
Available-for-sale investments, gross unrealized holding gains	370,264	204,302
Available-for-sale investments, gross unrealized holding losses	(2,329)	(8,225)
Available-for-sale investments, unrealized other-than-temporary impairment losses	0	0
Available-for-sale investments, estimated fair value	4,561,049	4,013,213
Foreign Governments [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale investments, amortized cost	1,349,640	1,302,329
Available-for-sale investments, gross unrealized holding gains	233,884	115,809
Available-for-sale investments, gross unrealized holding losses	(305)	(1,681)
Available-for-sale investments, unrealized other-than-temporary impairment losses	0	0
Available-for-sale investments, estimated fair value	1,583,219	1,416,457
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale investments, amortized cost	975,606	657,670
Available-for-sale investments, gross unrealized holding gains	48,531	6,867
Available-for-sale investments, gross unrealized holding losses	(533)	(4,999)
Available-for-sale investments, unrealized other-than-temporary impairment losses	0	0
Available-for-sale investments, estimated fair value	1,023,604	659,538
Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale investments, amortized cost	805,631	837,964
Available-for-sale investments, gross unrealized holding gains	57,100	22,563
Available-for-sale investments, gross unrealized holding losses	(529)	(4,022)
Available-for-sale investments, unrealized other-than-temporary impairment losses	(2,258)	(2,258)
Available-for-sale investments, estimated fair value	859,944	854,247
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale investments, amortized cost	28,232	36,462
Available-for-sale investments, gross unrealized holding gains	127	15
Available-for-sale investments, gross unrealized holding losses	(17)	(406)
Available-for-sale investments, unrealized other-than-temporary impairment losses	0	0
Available-for-sale investments, estimated fair value	28,342	36,071
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale investments, amortized cost	1,563,313	1,690,945
Available-for-sale investments, gross unrealized holding gains	82,823	41,123
Available-for-sale investments, gross unrealized holding losses	(1,293)	(16,209)
Available-for-sale investments, unrealized other-than-temporary impairment losses	(1,653)	(1,624)
Available-for-sale investments, estimated fair value	1,643,190	1,714,235
Total Fixed Maturities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale investments, amortized cost	9,590,337	9,038,158
Available-for-sale investments, gross unrealized holding gains	818,218	400,515
Available-for-sale investments, gross unrealized holding losses	(5,015)	(40,323)
Available-for-sale investments, unrealized other-than-temporary impairment losses	(3,911)	(3,882)
Available-for-sale investments, estimated fair value	10,399,629	9,394,468
Insurance, Banks And Other Financial Institutions [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale investments, amortized cost	835,144	651,002
Available-for-sale investments, gross unrealized holding gains	769,505	690,271
Available-for-sale investments, gross unrealized holding losses	(12,641)	(6,551)
Available-for-sale investments, unrealized other-than-temporary impairment losses	0	0
Available-for-sale investments, estimated fair value	1,592,008	1,334,722
Industrial, Consumer And All Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale investments, amortized cost	1,555,040	1,557,832
Available-for-sale investments, gross unrealized holding gains	1,270,474	1,227,052
Available-for-sale investments, gross unrealized holding losses	(21,953)	(45,131)
Available-for-sale investments, unrealized other-than-temporary impairment losses	0	0
Available-for-sale investments, estimated fair value	2,803,561	2,739,753
Total Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale investments, amortized cost	2,390,184	2,208,834
Available-for-sale investments, gross unrealized holding gains	2,039,979	1,917,323
Available-for-sale investments, gross unrealized holding losses	(34,594)	(51,682)
Available-for-sale investments, unrealized other-than-temporary impairment losses	0	0
Available-for-sale investments, estimated fair value	4,395,569	4,074,475
Short-Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale investments, amortized cost	1,995,368	1,642,103
Available-for-sale investments, gross unrealized holding gains	124	167
Available-for-sale investments, gross unrealized holding losses	(1)	(9)
Available-for-sale investments, unrealized other-than-temporary impairment losses	0	0
Available-for-sale investments, estimated fair value	$ 1,995,491	$ 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	Jun. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, estimated fair value, less than 12 months	$ 488,789	$ 2,030,690
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, less than 12 months	(36,952)	(76,054)
Available-for-sale securities, estimated fair value, 12 months or longer	367,263	813,147
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, 12 months or longer	(6,569)	(19,842)
Available-for-sale securities, estimated fair value	856,052	2,843,837
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses	(43,521)	(95,896)
U.S. Treasury Securities And Obligations Of U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, estimated fair value, less than 12 months	7,537	427,003
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, less than 12 months	(7)	(3,648)
Available-for-sale securities, estimated fair value, 12 months or longer	8,529	92,552
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, 12 months or longer	(2)	(1,133)
Available-for-sale securities, estimated fair value	16,066	519,555
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses	(9)	(4,781)
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	2,789	169,362
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, less than 12 months	(2)	(4,864)
Available-for-sale securities, estimated fair value, 12 months or longer	47,301	70,101
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, 12 months or longer	(2,327)	(3,361)
Available-for-sale securities, estimated fair value	50,090	239,463
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses	(2,329)	(8,225)
Foreign Governments [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, estimated fair value, less than 12 months	42,255	51,328
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, less than 12 months	(304)	(249)
Available-for-sale securities, estimated fair value, 12 months or longer	5,026	40,345
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, 12 months or longer	(1)	(1,432)
Available-for-sale securities, estimated fair value	47,281	91,673
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses	(305)	(1,681)
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, estimated fair value, less than 12 months	23,518	289,058
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, less than 12 months	(142)	(3,600)
Available-for-sale securities, estimated fair value, 12 months or longer	63,738	95,843
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, 12 months or longer	(391)	(1,399)
Available-for-sale securities, estimated fair value	87,256	384,901
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses	(533)	(4,999)
Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, estimated fair value, less than 12 months	6,584	78,814
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, less than 12 months	(2,304)	(2,858)
Available-for-sale securities, estimated fair value, 12 months or longer	104,340	137,100
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, 12 months or longer	(483)	(3,422)
Available-for-sale securities, estimated fair value	110,924	215,914
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses	(2,787)	(6,280)
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, estimated fair value, less than 12 months	0	6,228
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, less than 12 months	0	(54)
Available-for-sale securities, estimated fair value, 12 months or longer	6,316	24,315
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, 12 months or longer	(17)	(352)
Available-for-sale securities, estimated fair value	6,316	30,543
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses	(17)	(406)
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, estimated fair value, less than 12 months	37,222	470,694
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, less than 12 months	(1,664)	(9,509)
Available-for-sale securities, estimated fair value, 12 months or longer	104,194	343,737
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, 12 months or longer	(1,282)	(8,324)
Available-for-sale securities, estimated fair value	141,416	814,431
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses	(2,946)	(17,833)
Total Fixed Maturities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, estimated fair value, less than 12 months	119,905	1,492,487
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, less than 12 months	(4,423)	(24,782)
Available-for-sale securities, estimated fair value, 12 months or longer	339,444	803,993
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, 12 months or longer	(4,503)	(19,423)
Available-for-sale securities, estimated fair value	459,349	2,296,480
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses	(8,926)	(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	77,737	63,873
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, less than 12 months	(12,641)	(6,384)
Available-for-sale securities, estimated fair value, 12 months or longer	0	6,247
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, 12 months or longer	0	(167)
Available-for-sale securities, estimated fair value	77,737	70,120
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses	(12,641)	(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	191,170	344,857
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, less than 12 months	(19,887)	(44,879)
Available-for-sale securities, estimated fair value, 12 months or longer	27,819	2,907
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, 12 months or longer	(2,066)	(252)
Available-for-sale securities, estimated fair value	218,989	347,764
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses	(21,953)	(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	268,907	408,730
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, less than 12 months	(32,528)	(51,263)
Available-for-sale securities, estimated fair value, 12 months or longer	27,819	9,154
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, 12 months or longer	(2,066)	(419)
Available-for-sale securities, estimated fair value	296,726	417,884
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses	(34,594)	(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	99,977	129,473
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses, less than 12 months	(1)	(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	99,977	129,473
Available-for-sale securities, gross unrealized holding and other-than-temporary impairment losses	$ (1)	$ (9)

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Investments (Schedule Of Amortized Cost And Estimated Fair Value Of Fixed Maturities By Contractual Maturity Date) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Due in one year or less, amortized cost	$ 720,305
Due after one year through five years, amortized cost	1,386,900
Due after five years through ten years, amortized cost	1,654,425
Due after ten years, amortized cost	4,019,238
Amortized cost, sub-total	7,780,868
Total fixed maturities, amortized cost	9,590,337	$ 9,038,158
Due in one year or less, estimated fair value	726,444
Due after one year through five years, estimated fair value	1,441,314
Due after five years through ten years, estimated fair value	1,802,966
Due after ten years, estimated fair value	4,517,015
Estimated fair value, sub-total	8,487,739
Total fixed maturities, estimated fair value	10,399,629	$ 9,394,468
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturities, amortized cost	975,606
Fixed maturities, estimated fair value	1,023,604
Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturities, amortized cost	805,631
Fixed maturities, estimated fair value	859,944
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturities, amortized cost	28,232
Fixed maturities, estimated fair value	$ 28,342

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Investments (Components Of Net Investment Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Municipal bonds (tax-exempt)	$ 22,563	$ 24,293	$ 44,485	$ 50,145
Short-term investments, including overnight deposits	2,654	1,116	4,945	2,367
Dividends on equity securities	16,758	18,633	34,410	37,657
Income from equity method investments	3,921	1,712	3,668	3,056
Other	190	479	2,674	540
Total investment income	99,267	94,396	194,570	191,166
Investment expenses	(4,271)	(3,810)	(8,280)	(7,705)
Net investment income	94,996	90,586	186,290	183,461
Taxable Municipal Bonds [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Taxable bonds	16,222	14,150	32,110	28,250
Other Taxable Bonds [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Taxable bonds	$ 36,959	$ 34,013	$ 72,278	$ 69,151

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Investments (Summary Of Net Realized Investment Gains (Losses) And The Change In Net Unrealized Gains On Investments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Gain (Loss) on Investments [Line Items]
Realized gains	$ 18,850	$ 9,509	$ 47,266	$ 27,707
Realized losses	(6,315)	(226)	(18,129)	(5,812)
Gains (losses) on securities measured at fair value through net income	4,706	(3,178)	9,283	(10,219)
Other-than-temporary impairment losses recognized in net income	(3,675)	0	(12,080)	(5,092)
Net realized investment gains	17,241	6,105	38,420	11,676
Change in net unrealized gains on investments	255,844	(351,332)	592,691	(186,669)
Sales Of Fixed Maturities [Member]
Gain (Loss) on Investments [Line Items]
Realized gains	699	770	967	2,338
Realized losses	(142)	(97)	(555)	(221)
Sales Of Equity Securities [Member]
Gain (Loss) on Investments [Line Items]
Realized gains	17,798	7,000	45,526	22,956
Realized losses	(1,780)	(113)	(2,498)	(272)
Other [Member]
Gain (Loss) on Investments [Line Items]
Realized gains	353	1,739	773	2,413
Realized losses	(718)	(16)	(2,996)	(227)
Fixed Maturities [Member]
Gain (Loss) on Investments [Line Items]
Change in net unrealized gains on investments	213,026	(286,551)	452,982	(180,213)
Equity Securities [Member]
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses recognized in net income	(3,700)		(12,100)	(5,100)
Change in net unrealized gains on investments	42,786	(64,792)	139,744	(6,447)
Short-Term Investments [Member]
Gain (Loss) on Investments [Line Items]
Change in net unrealized gains on investments	$ 32	$ 11	$ (35)	$ (9)

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Fair Value Measurements (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Fair Value Disclosures [Abstract]
Fair value, level 1 to level 2 transfers, amount	$ 0	$ 0	$ 0	$ 0
Fair value, level 2 to level 1 transfers, amount	0	0	0	0
Assets measured at fair value on a nonrecurring basis	0	0	0	0
Liabilities measured at fair value on a nonrecurring basis	$ 0	$ 0	$ 0	$ 0

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Fair Value Measurements (Balances Of Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities	$ 10,399,629	$ 9,394,468
Total equity securities	4,395,569	4,074,475
Short-term investments	1,995,491	1,642,261
Available-for-sale investments, estimated fair value	16,790,689	15,111,204
Fixed Maturities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments, estimated fair value	10,399,629	9,394,468
U.S. Treasury Securities And Obligations Of U.S. Government Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments, estimated fair value	700,281	700,707
Obligations Of States, Municipalities And Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments, estimated fair value	4,561,049	4,013,213
Foreign Governments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments, estimated fair value	1,583,219	1,416,457
Commercial Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments, estimated fair value	1,023,604	659,538
Residential Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments, estimated fair value	859,944	854,247
Asset-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments, estimated fair value	28,342	36,071
Corporate Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments, estimated fair value	1,643,190	1,714,235
Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments, estimated fair value	4,395,569	4,074,475
Insurance, Banks And Other Financial Institutions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments, estimated fair value	1,592,008	1,334,722
Industrial, Consumer And All Other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments, estimated fair value	2,803,561	2,739,753
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities	10,399,629	9,394,468
Total equity securities	4,395,569	4,074,475
Short-term investments	1,995,491	1,642,261
Available-for-sale investments, estimated fair value	16,790,689	15,111,204
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities	0	0
Total equity securities	4,212,046	4,074,475
Short-term investments	1,877,297	1,529,924
Available-for-sale investments, estimated fair value	6,089,343	5,604,399
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities	10,399,629	9,394,468
Total equity securities	0	0
Short-term investments	118,194	112,337
Available-for-sale investments, estimated fair value	10,517,823	9,506,805
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities	0	0
Total equity securities	183,523	0
Short-term investments	0	0
Available-for-sale investments, estimated fair value	183,523	0
Fair Value, Measurements, Recurring [Member] | U.S. Treasury Securities And Obligations Of U.S. Government Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities	700,281	700,707
Fair Value, Measurements, Recurring [Member] | U.S. Treasury Securities And Obligations Of U.S. Government Agencies [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities	0	0
Fair Value, Measurements, Recurring [Member] | U.S. Treasury Securities And Obligations Of U.S. Government Agencies [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities	700,281	700,707
Fair Value, Measurements, Recurring [Member] | U.S. Treasury Securities And Obligations Of U.S. Government Agencies [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities	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]
Total fixed maturities	4,561,049	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]
Total fixed maturities	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]
Total fixed maturities	4,561,049	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]
Total fixed maturities	0	0
Fair Value, Measurements, Recurring [Member] | Foreign Governments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities	1,583,219	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]
Total fixed maturities	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]
Total fixed maturities	1,583,219	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]
Total fixed maturities	0	0
Fair Value, Measurements, Recurring [Member] | Commercial Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities	1,023,604	659,538
Fair Value, Measurements, Recurring [Member] | Commercial Mortgage-Backed Securities [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities	0	0
Fair Value, Measurements, Recurring [Member] | Commercial Mortgage-Backed Securities [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities	1,023,604	659,538
Fair Value, Measurements, Recurring [Member] | Commercial Mortgage-Backed Securities [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities	0	0
Fair Value, Measurements, Recurring [Member] | Residential Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities	859,944	854,247
Fair Value, Measurements, Recurring [Member] | Residential Mortgage-Backed Securities [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities	0	0
Fair Value, Measurements, Recurring [Member] | Residential Mortgage-Backed Securities [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities	859,944	854,247
Fair Value, Measurements, Recurring [Member] | Residential Mortgage-Backed Securities [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities	0	0
Fair Value, Measurements, Recurring [Member] | Asset-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities	28,342	36,071
Fair Value, Measurements, Recurring [Member] | Asset-Backed Securities [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities	0	0
Fair Value, Measurements, Recurring [Member] | Asset-Backed Securities [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities	28,342	36,071
Fair Value, Measurements, Recurring [Member] | Asset-Backed Securities [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities	0	0
Fair Value, Measurements, Recurring [Member] | Corporate Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities	1,643,190	1,714,235
Fair Value, Measurements, Recurring [Member] | Corporate Bonds [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities	0	0
Fair Value, Measurements, Recurring [Member] | Corporate Bonds [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities	1,643,190	1,714,235
Fair Value, Measurements, Recurring [Member] | Corporate Bonds [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities	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]
Total equity securities	1,592,008	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]
Total equity securities	1,408,485	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]
Total 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]
Total equity securities	183,523	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]
Total equity securities	2,803,561	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]
Total equity securities	2,803,561	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]
Total 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]
Total 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		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Fair Value Disclosures [Abstract]
Equity securities, beginning of period		$ 176,942	$ 0	$ 0	$ 0
Purchases		25,000	0	195,250	0
Sales		(25,000)	0	(25,000)	0
Total gains included in net income		6,581	0	13,273	0
Total gains included in other comprehensive income (loss)		0	0	0	0
Transfers into level 3		0	0	0	0
Transfers out of level 3		0	0	0	0
Equity securities, end of period		183,523	0	183,523	0
Net unrealized gains included in net income relating to assets held at June 30, 2016 and 2015	[1]	$ 6,581	$ 0	$ 13,273	$ 0

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

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Segment Reporting Disclosures (Company's Segment Disclosures) (Details) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) segment	Jun. 30, 2015 USD ($)
Segment Reporting Information [Line Items]
Number of reportable ongoing underwriting segments | segment				3
Gross premium volume		$ 1,277,649	$ 1,265,786	$ 2,670,312	$ 2,518,259
Net written premiums		1,050,546	1,034,344	2,232,506	2,069,774
Earned premiums		950,859	957,557	1,908,545	1,901,207
Losses and loss adjustment expenses, current accident year		(651,238)	(664,854)	(1,243,523)	(1,279,195)
Losses and loss adjustment expenses, prior accident years		139,682	128,660	258,003	296,006
Underwriting, acquisition and insurance expenses		(375,580)	(379,652)	(740,268)	(720,337)
Underwriting profit (loss)		63,723	41,711	182,757	197,681
Net investment income		94,996	90,586	186,290	183,461
Net realized investment gains		17,241	6,105	38,420	11,676
Other revenues (insurance)		2,013	3,937	8,048	11,126
Other expenses (insurance)		(10,020)	(5,950)	(20,299)	(15,608)
Segment profit (loss)		167,953	136,389	395,216	388,336
Other revenues (non-insurance)		310,828	246,420	610,816	499,289
Other expenses (non-insurance)		(267,889)	(236,286)	(532,703)	(457,629)
Amortization of intangible assets		(17,204)	(16,949)	(34,464)	(31,589)
Interest expense		(33,697)	(29,288)	(64,538)	(58,600)
Loss on early extinguishment of debt		(44,100)	0	(44,100)	0
Income Before Income Taxes		$ 115,891	$ 100,286	$ 330,227	$ 339,807
U.S. GAAP combined ratio	[1]	93.00%	96.00%	90.00%	90.00%
U.S. Insurance [Member]
Segment Reporting Information [Line Items]
Gross premium volume		$ 689,468	$ 668,853	$ 1,337,258	$ 1,254,218
Net written premiums		579,233	554,638	1,131,978	1,050,807
Earned premiums		533,328	520,446	1,065,796	1,035,000
Losses and loss adjustment expenses, current accident year		(352,092)	(341,335)	(668,425)	(658,092)
Losses and loss adjustment expenses, prior accident years		66,332	68,620	104,986	136,201
Underwriting, acquisition and insurance expenses		(212,915)	(211,856)	(410,378)	(397,116)
Underwriting profit (loss)		34,653	35,875	91,979	115,993
Net investment income		0	0	0	0
Net realized investment gains		0	0	0	0
Other revenues (insurance)		958	2,203	2,377	3,605
Other expenses (insurance)		(684)	(1,284)	(1,408)	(2,189)
Segment profit (loss)		$ 34,927	$ 36,794	$ 92,948	$ 117,409
U.S. GAAP combined ratio	[1]	94.00%	93.00%	91.00%	89.00%
International Insurance [Member]
Segment Reporting Information [Line Items]
Gross premium volume		$ 318,581	$ 338,159	$ 609,985	$ 627,386
Net written premiums		244,636	264,129	471,035	486,837
Earned premiums		203,052	223,941	418,397	429,902
Losses and loss adjustment expenses, current accident year		(146,453)	(168,896)	(291,929)	(317,740)
Losses and loss adjustment expenses, prior accident years		39,002	43,373	68,654	120,023
Underwriting, acquisition and insurance expenses		(96,562)	(94,617)	(185,168)	(173,411)
Underwriting profit (loss)		(961)	3,801	9,954	58,774
Net investment income		0	0	0	0
Net realized investment gains		0	0	0	0
Other revenues (insurance)		609	915	4,730	6,302
Other expenses (insurance)		(2,137)	(1,318)	(3,691)	(2,722)
Segment profit (loss)		$ (2,489)	$ 3,398	$ 10,993	$ 62,354
U.S. GAAP combined ratio	[1]	100.00%	98.00%	98.00%	86.00%
Reinsurance [Member]
Segment Reporting Information [Line Items]
Gross premium volume		$ 269,604	$ 258,745	$ 723,090	$ 636,582
Net written premiums		226,681	215,520	629,407	531,732
Earned premiums		214,514	213,140	424,133	435,894
Losses and loss adjustment expenses, current accident year		(152,693)	(154,623)	(283,169)	(303,363)
Losses and loss adjustment expenses, prior accident years		34,644	15,118	71,005	41,505
Underwriting, acquisition and insurance expenses		(66,143)	(73,170)	(144,648)	(149,723)
Underwriting profit (loss)		30,322	465	67,321	24,313
Net investment income		0	0	0	0
Net realized investment gains		0	0	0	0
Other revenues (insurance)		0	469	0	892
Other expenses (insurance)		0	0	0	0
Segment profit (loss)		$ 30,322	$ 934	$ 67,321	$ 25,205
U.S. GAAP combined ratio	[1]	86.00%	100.00%	84.00%	94.00%
Other Insurance (Discontinued Lines) [Member]
Segment Reporting Information [Line Items]
Gross premium volume		$ (4)	$ 29	$ (21)	$ 73
Net written premiums		(4)	57	86	398
Earned premiums		(35)	30	219	411
Losses and loss adjustment expenses, current accident year		0	0	0	0
Losses and loss adjustment expenses, prior accident years		(296)	1,549	13,358	(1,723)
Underwriting, acquisition and insurance expenses		40	(9)	(74)	(87)
Underwriting profit (loss)		(291)	1,570	13,503	(1,399)
Net investment income		0	0	0	0
Net realized investment gains		0	0	0	0
Other revenues (insurance)		446	350	941	327
Other expenses (insurance)		(7,199)	(3,348)	(15,200)	(10,697)
Segment profit (loss)		$ (7,044)	$ (1,428)	$ (756)	$ (11,769)
U.S. GAAP combined ratio - not meaniningful	[1],[2]	NM	NM	NM	NM
Investing [Member]
Segment Reporting Information [Line Items]
Gross premium volume		$ 0	$ 0	$ 0	$ 0
Net written premiums		0	0	0	0
Earned premiums		0	0	0	0
Losses and loss adjustment expenses, current accident year		0	0	0	0
Losses and loss adjustment expenses, prior accident years		0	0	0	0
Underwriting, acquisition and insurance expenses		0	0	0	0
Underwriting profit (loss)		0	0	0	0
Net investment income		94,996	90,586	186,290	183,461
Net realized investment gains		17,241	6,105	38,420	11,676
Other revenues (insurance)		0	0	0	0
Other expenses (insurance)		0	0	0	0
Segment profit (loss)		$ 112,237	$ 96,691	$ 224,710	$ 195,137

[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 (Reconciliation Of Segment Assets To The Company's Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Assets	$ 26,335,628	$ 24,939,115
Non-Insurance Operations [Member]
Segment Reporting Information [Line Items]
Assets	1,536,669	1,497,042
Segment Assets [Member]
Segment Reporting Information [Line Items]
Assets	24,798,959	23,442,073
Segment Assets [Member] | Investing [Member]
Segment Reporting Information [Line Items]
Assets	18,976,263	18,056,947
Segment Assets [Member] | Underwriting [Member]
Segment Reporting Information [Line Items]
Assets	$ 5,822,696	$ 5,385,126

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Senior Long-Term Debt (Narrative) (Details) - USD ($) $ in Thousands			1 Months Ended	3 Months Ended		6 Months Ended
	May 05, 2016	Apr. 05, 2016	Apr. 30, 2016	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Debt Instrument [Line Items]
Loss on early extinguishment of debt				$ (44,100)	$ 0	$ (44,100)	$ 0
5.0% Unsecured Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 100,000	$ 400,000
Debt instrument, interest rate	5.00%	5.00%
Net proceeds from issuance of unsecured senior notes	$ 100,800	$ 392,300
7.35% Unsecured Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate			7.35%
Debt instrument, repurchased face amount			$ 70,200
Early repayment of senior debt			$ 95,000
7.125% Unsecured Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate			7.125%
Debt instrument, repurchased face amount			$ 108,800
Early repayment of senior debt			$ 126,400
7.20% Unsecured Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate				7.20%		7.20%
Debt instrument, principal amount outstanding				$ 90,600		$ 90,600

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Other Revenues And Other Expenses (Summary Of Other Revenues And Other Expenses By Component) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Other Revenues and Other Expenses [Line Items]
Other revenues	$ 312,841	$ 250,357	$ 618,864	$ 510,415
Other expenses	277,909	242,236	553,002	473,237
Insurance Operations [Member]
Other Revenues and Other Expenses [Line Items]
Other revenues	2,013	3,937	8,048	11,126
Other expenses	10,020	5,950	20,299	15,608
Non-Insurance Operations [Member]
Other Revenues and Other Expenses [Line Items]
Other revenues	310,828	246,420	610,816	499,289
Other expenses	267,889	236,286	532,703	457,629
Managing General Agent Operations [Member] | Insurance Operations [Member]
Other Revenues and Other Expenses [Line Items]
Other revenues	1,567	3,118	7,107	8,988
Other expenses	2,821	2,602	5,099	4,911
Life And Annuity [Member] | Insurance Operations [Member]
Other Revenues and Other Expenses [Line Items]
Other revenues	446	350	941	327
Other expenses	7,199	3,348	15,200	10,697
Other Insurance [Member] | Insurance Operations [Member]
Other Revenues and Other Expenses [Line Items]
Other revenues	0	469	0	1,811
Other expenses	0	0	0	0
Manufacturing [Member] | Non-Insurance Operations [Member] | Markel Ventures Operations [Member]
Other Revenues and Other Expenses [Line Items]
Other revenues	193,152	174,141	385,843	351,903
Other expenses	159,227	168,580	319,593	320,380
Non-Manufacturing [Member] | Non-Insurance Operations [Member] | Markel Ventures Operations [Member]
Other Revenues and Other Expenses [Line Items]
Other revenues	104,602	65,412	198,430	133,093
Other expenses	91,685	63,013	180,118	126,843
Investment Management [Member] | Non-Insurance Operations [Member]
Other Revenues and Other Expenses [Line Items]
Other revenues	7,350	0	14,523	0
Other expenses	10,836	0	20,766	0
Other Non-Insurance [Member] | Non-Insurance Operations [Member]
Other Revenues and Other Expenses [Line Items]
Other revenues	5,724	6,867	12,020	14,293
Other expenses	$ 6,141	$ 4,693	$ 12,226	$ 10,406

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Reinsurance (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Reinsurance Disclosures [Abstract]
Percentage of ceded earned premiums to gross earned premiums	18.00%	19.00%	18.00%	19.00%
Percentage of assumed earned premiums to net earned premiums	31.00%	32.00%	31.00%	32.00%
Reinsurance recoverables	$ 75.5	$ 143.3	$ 206.1	$ 232.1

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Reinsurance (Effect Of Reinsurance And Retrocessional Reinsurance On Premiums Written And Earned) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Reinsurance Disclosures [Abstract]
Direct premiums written	$ 957,244	$ 951,885	$ 1,836,332	$ 1,753,465
Direct premiums earned	865,943	875,376	1,733,387	1,719,946
Assumed premiums written	320,405	313,901	833,980	764,794
Assumed premiums earned	295,868	304,324	585,931	617,159
Ceded premiums written	(227,103)	(231,442)	(437,806)	(448,485)
Ceded premiums earned	(210,952)	(222,143)	(410,773)	(435,898)
Net premiums written	1,050,546	1,034,344	2,232,506	2,069,774
Net premiums earned	$ 950,859	$ 957,557	$ 1,908,545	$ 1,901,207

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Life And Annuity Benefits (Narrative) (Details) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)
Liability for Future Policy Benefits [Abstract]
Increase in life and annuity benefits	$ 47.9	$ 47.9
Cumulative adjustment to life and annuity benefits	$ 47.9	$ 47.9

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Income Taxes (Narrative) (Details)	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Income Tax Disclosure [Abstract]
Effective tax rate	26.00%	16.00%
U.S. statutory tax rate	35.00%	35.00%
Favorable impact due to recognition of foreign tax credits		12.00%

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Variable Interest Entities (Narrative) (Details) $ in Millions	Jun. 30, 2016 USD ($)
Variable Interest Entity [Line Items]
Total investment and insurance assets under management of MCIM for unconsolidated VIEs	$ 3,400.0
Other Fund [Member]
Variable Interest Entity [Line Items]
Investment in one of the unconsolidated Funds	25.2
Markel Diversified Fund [Member]
Variable Interest Entity [Line Items]
Total assets of the Markel Diversified Fund	161.8
Total liabilities of the Markel Diversified Fund	63.9
Investment in one of the unconsolidated Funds	$ 158.3
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	$ 62.5

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Net Income Per Share (Schedule Of Net Income Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share [Line Items]
Net income to shareholders	$ 78,797	$ 91,369	$ 239,167	$ 282,361
Adjustment of redeemable noncontrolling interests	(2,529)	3,062	(5,981)	1,715
Adjusted net income to shareholders	$ 76,268	$ 94,431	$ 233,186	$ 284,076
Basic common shares outstanding	14,012	13,975	14,003	13,973
Diluted shares outstanding	14,088	14,052	14,087	14,057
Basic net income per share	$ 5.44	$ 6.76	$ 16.65	$ 20.33
Diluted net income per share	$ 5.41	$ 6.72	$ 16.55	$ 20.21
Stock Options [Member]
Earnings Per Share [Line Items]
Dilutive potential common shares	4	9	5	10
Restricted Stock Units (RSUs) [Member]
Earnings Per Share [Line Items]
Dilutive potential common shares	72	68	79	74

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Other Comprehensive Income (Loss) (Change In Accumulated Other Comprehensive Income By Component, Net Of Taxes And Noncontrolling Interest) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive income, beginning balance	$ 1,354,508	$ 1,704,557
Other comprehensive income (loss) before reclassifications	390,462	(120,374)
Amounts reclassified from accumulated other comprehensive income	(22,693)	(13,105)
Total other comprehensive income (loss)	367,769	(133,479)
Accumulated other comprehensive income, ending balance	1,722,277	1,571,078
Unrealized Holding Gains On Available-For-Sale Securities [Member]
Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive income, beginning balance	1,472,762	1,793,254
Other comprehensive income (loss) before reclassifications	388,273	(109,001)
Amounts reclassified from accumulated other comprehensive income	(23,550)	(14,037)
Total other comprehensive income (loss)	364,723	(123,038)
Accumulated other comprehensive income, ending balance	1,837,485	1,670,216
Foreign Currency [Member]
Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive income, beginning balance	(72,696)	(43,491)
Other comprehensive income (loss) before reclassifications	2,189	(11,373)
Amounts reclassified from accumulated other comprehensive income	0	0
Total other comprehensive income (loss)	2,189	(11,373)
Accumulated other comprehensive income, ending balance	(70,507)	(54,864)
Net Actuarial Pension Loss [Member]
Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive income, beginning balance	(45,558)	(45,206)
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income	857	932
Total other comprehensive income (loss)	857	932
Accumulated other comprehensive income, ending balance	$ (44,701)	$ (44,274)

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Other Comprehensive Income (Loss) (Summary Of Tax Expense (Benefit) Of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Other Comprehensive Income (Loss), Tax [Abstract]
Net holding gains (losses) arising during the period	$ 71,381	$ (113,579)	$ 187,880	$ (57,997)
Change in unrealized other-than-temporary impairment losses on fixed maturities arising during the period	9	(3)	(6)	38
Reclassification adjustments for net gains included in net income	(2,333)	(2,576)	(7,810)	(5,672)
Change in net unrealized gains on investments	69,057	(116,158)	180,064	(63,631)
Change in foreign currency translation adjustments	(1,618)	1,872	(1,695)	833
Change in net actuarial pension loss	86	117	188	233
Total	$ 67,525	$ (114,169)	$ 178,557	$ (62,565)

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Other Comprehensive Income (Loss) (Reclassifications From Accumulated Other Comprehensive Income Into Income, By Component) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Reclassification Out Of Accumulated Other Comprehensive Income [Line Items]
Other-than-temporary impairment losses recognized in net income	$ (3,675)	$ 0	$ (12,080)	$ (5,092)
Net realized investment gains, excluding other-than-temporary impairment losses	20,916	6,105	50,500	16,768
Income Before Income Taxes	115,891	100,286	330,227	339,807
Underwriting, acquisition and insurance expenses	(375,580)	(379,652)	(740,268)	(720,337)
Income taxes	(35,218)	(7,833)	(85,908)	(53,348)
Net Income	80,673	92,453	244,319	286,459
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	(3,675)	0	(12,080)	(5,092)
Net realized investment gains, excluding other-than-temporary impairment losses	16,575	7,560	43,440	24,801
Income Before Income Taxes	12,900	7,560	31,360	19,709
Income taxes	(2,333)	(2,576)	(7,810)	(5,672)
Net Income	10,567	4,984	23,550	14,037
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	(480)	(586)	(1,045)	(1,165)
Income taxes	86	117	188	233
Net Income	$ (394)	$ (469)	$ (857)	$ (932)