10-K

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 10-K

(Mark One)
[x]	ANNUAL REPORT PURSUANT TO SECTION 13 or 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2018

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 1-15202

W. R. BERKLEY CORPORATION

(Exact name of registrant as specified in its charter)

Delaware	22-1867895
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification Number)
475 Steamboat Road, Greenwich, CT (Address of principal executive offices)	06830 (Zip Code)

Registrant’s telephone number, including area code: (203) 629-3000

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

Title of Each Class	Name of Each Exchange on Which Registered
Common Stock, par value $.20 per share	New York Stock Exchange
5.625% Subordinated Debentures due 2053	New York Stock Exchange
5.9% Subordinated Debentures due 2056	New York Stock Exchange
5.75% Subordinated Debentures due 2056	New York Stock Exchange
5.70% Subordinated Debentures due 2058	New York Stock Exchange

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

None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. 

 Yes S No o

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of the Act. 

 Yes  o   No S

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 S   No o

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted 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 such files).  Yes S     No o

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

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

Large accelerated filer S	Accelerated filer o
Non-accelerated filer o	Smaller reporting company o
	Emerging growth company o

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.

 o

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

The aggregate market value of the voting and non-voting common stock held by non-affiliates (computed by reference to the price at which the common stock was last sold) as of the last business day of the registrant’s most recently completed second fiscal quarter was $7,014,828,524.

Number of shares of common stock, $.20 par value, outstanding as of February 19, 2019: 122,013,621

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the Company’s definitive proxy statement, which will be filed with the Securities and Exchange Commission within 120 days after December 31, 2018, are incorporated herein by reference in Part III.

			Page
SAFE HARBOR STATEMENT
	PART I
ITEM	1.	BUSINESS	1
ITEM	1A.	RISK FACTORS	18
ITEM	1B.	UNRESOLVED STAFF COMMENTS	27
ITEM	2.	PROPERTIES	27
ITEM	3.	LEGAL PROCEEDINGS	27
ITEM	4.	MINE SAFETY DISCLOSURES	27
	PART II
ITEM	5.	MARKET FOR REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES	28
ITEM	6.	SELECTED FINANCIAL DATA	30
ITEM	7.	MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS	31
ITEM	7A.	QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK	54
ITEM	8.	FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA	55
ITEM	9.	CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE	104
ITEM	9A.	CONTROLS AND PROCEDURES	104
ITEM	9B.	OTHER INFORMATION	106
	PART III
ITEM	10.	DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE	107
ITEM	11.	EXECUTIVE COMPENSATION	107
ITEM	12.	SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS	107
ITEM	13.	CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE	107
ITEM	14.	PRINCIPAL ACCOUNTING FEES AND SERVICES	107
	PART IV
ITEM	15.	EXHIBITS, FINANCIAL STATEMENT SCHEDULES	108
ITEM	16.	FORM 10-K SUMMARY	112
EX-21		LIST OF COMPANIES AND SUBSIDIARIES
EX-23		CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
EX-31.1		CERTIFICATION OF THE CHIEF EXECUTIVE OFFICER PURSUANT TO RULE 13a-14(a) /15d-14(a)
EX-31.2		CERTIFICATION OF THE CHIEF FINANCIAL OFFICER PURSUANT TO RULE 13a-14(a) /15d-14(a)
EX-32.1		CERTIFICATION OF THE CHIEF EXECUTIVE OFFICER AND CHIEF FINANCIAL OFFICER PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002
EX-101		INSTANCE DOCUMENT
EX-101		SCHEMA DOCUMENT
EX-101		CALCULATION LINKBASE DOCUMENT
EX-101		LABELS LINKBASE DOCUMENT
EX-101		PRESENTATION LINKBASE DOCUMENT
EX-101		DEFINITION LINKBASE DOCUMENT

SAFE HARBOR STATEMENT

UNDER THE PRIVATE SECURITIES

LITIGATION REFORM ACT OF 1995

This is a “Safe Harbor” Statement under the Private Securities Litigation Reform Act of 1995. This document may contain forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Some of the forward-looking statements can be identified by the use of forward-looking words such as “believes,” “expects,” “potential,” “continued,” “may,” “will,” “should,” “seeks,” “approximately,” “predicts,” “intends,” “plans,” “estimates,” “anticipates” or the negative version of those words or other comparable words. Any forward-looking statements contained in this report including statements related to our outlook for the industry and for our performance for the year 2019 and beyond, are based upon our historical performance and on current plans, estimates and expectations. The inclusion of this forward-looking information should not be regarded as a representation by us that the future plans, estimates or expectations contemplated by us will be achieved. They are subject to various risks and uncertainties, including but not limited to:

• the cyclical nature of the property casualty industry;

• the impact of significant competition, including new alternative entrants to the industry;

• the long-tail and potentially volatile nature of the insurance and reinsurance business;

• product demand and pricing;

• claims development and the process of estimating reserves;

• investment risks, including those of our portfolio of fixed maturity securities and investments in equity securities, including investments in financial institutions, municipal bonds, mortgage-backed securities, loans receivable, investment funds, including real estate, merger arbitrage, energy related and private equity investments;

• the effects of emerging claim and coverage issues;

• the uncertain nature of damage theories and loss amounts;

• natural and man-made catastrophic losses, including as a result of terrorist activities;

• the impact of climate change, which may increase the frequency and severity of catastrophe events;

• general economic and market activities, including inflation, interest rates and volatility in the credit and capital markets;

• the impact of conditions in the financial markets and the global economy, and the potential effect of legislative, regulatory, accounting or other initiatives taken in response to it, on our results and financial condition;

• foreign currency and political risks (including those associated with the United Kingdom's withdrawal from the European Union, or "Brexit") relating to our international operations;

• our ability to attract and retain key personnel and qualified employees;

• continued availability of capital and financing;

• the success of our new ventures or acquisitions and the availability of other opportunities;

• the availability of reinsurance;

• our retention under the Terrorism Risk Insurance Program Reauthorization Act of 2015 ("TRIPRA");

• the ability or willingness of our reinsurers to pay reinsurance recoverables owed to us;

• other legislative and regulatory developments, including those related to business practices in the insurance industry;

• credit risk relating to our policyholders, independent agents and brokers;

• changes in the ratings assigned to us or our insurance company subsidiaries by rating agencies;

• the availability of dividends from our insurance company subsidiaries;

• potential difficulties with technology and/or cyber security issues;

• the effectiveness of our controls to ensure compliance with guidelines, policies and legal and regulatory standards; and

• other risks detailed in this Form 10-K and from time to time in our other filings with the Securities and Exchange Commission (“SEC”).

We describe these risks and uncertainties in greater detail in Item 1A, Risk Factors. These risks and uncertainties could cause our actual results for the year 2019 and beyond to differ materially from those expressed in any forward-looking statement we make. Any projections of growth in our revenues would not necessarily result in commensurate levels of earnings. Our future financial performance is dependent upon factors discussed elsewhere in this Form 10-K and our other SEC filings. Forward-looking statements speak only as of the date on which they are made.

PART I

ITEM 1. BUSINESS

W. R. Berkley Corporation is an insurance holding company that is among the largest commercial lines writers in the United States and operates worldwide in two segments of the property casualty insurance business:

• Insurance - predominantly commercial insurance business, including excess and surplus lines, admitted lines and specialty personal lines throughout the United States, as well as insurance business in the United Kingdom, Continental Europe, South America, Canada, Mexico, Scandinavia, Asia and Australia.

• Reinsurance - reinsurance business on a facultative and treaty basis, primarily in the United States, United Kingdom, Continental Europe, Australia, the Asia-Pacific region and South Africa.

Our two reporting segments are composed of individual operating units that serve a market defined by geography, products, services or industry served. Each of our operating units is positioned close to its customer base and participates in a niche market requiring specialized knowledge about a territory, product or industry served. This strategy of decentralized operations allows each of our units to identify and respond quickly and effectively to changing market conditions and specific customer needs, while capitalizing on the benefits of centralized capital, investment and reinsurance management, and corporate actuarial, financial, enterprise risk management and legal staff support.

Our business approach is focused on meeting the needs of our customers, maintaining a high quality balance sheet, and allocating capital to our best opportunities. New businesses are started when opportunities are identified and when the right talent and expertise are found to lead a business. Of our 53 operating units, 46 have been organized and developed internally and seven have been added through acquisition.

    Net premiums written, as reported based on United States generally accepted accounting principles (“GAAP”), for each of our operating segments for each of the past five years were as follows:

	Year Ended December 31,
(In thousands)	2018		2017		2016		2015		2014
Net premiums written:
Insurance	$	5,952,861	$	5,715,871	$	5,743,620	$	5,555,437	$	5,302,436
Reinsurance	480,366		544,637		680,293		634,078		694,511
Total	$	6,433,227	$	6,260,508	$	6,423,913	$	6,189,515	$	5,996,947

	Year Ended December 31,
	2018		2017		2016		2015		2014
Percentage of net premiums written:
Insurance	92.5	%	91.3	%	89.4	%	89.8	%	88.4	%
Reinsurance	7.5		8.7		10.6		10.2		11.6
Total	100.0	%	100.0	%	100.0	%	100.0	%	100.0	%

Thirty-two of our insurance company subsidiaries are rated by A.M. Best Company, Inc. ("A.M. Best") and have ratings of A+ (Superior) (the second highest rating out of 15 possible ratings). A.M. Best's ratings are based upon factors of concern to policyholders, insurance agents and brokers and are not directed toward the protection of investors. A.M. Best states: “The Financial Strength Rating opinion addresses the relative ability of an insurer to meet its ongoing insurance obligations. The ratings are not assigned to specific insurance policies or contracts and do not address any other risk.” A.M. Best reviews its ratings on a periodic basis, and its ratings of the Company's subsidiaries are therefore subject to change.

Our twenty-five insurance company subsidiaries rated by Standard & Poor's (“S&P”) have financial strength ratings of A+ (the seventh highest rating out of twenty-seven possible ratings).

Our Moody's ratings are A1 for Berkley Insurance Company, Berkley Regional Insurance Company and Admiral Insurance Company (the sixth highest rating out of twenty-one possible ratings).

1

The following sections describe our reporting segments and their operating units in greater detail. These operating units underwrite on behalf of one or more affiliated insurance companies within the group. The operating units are identified by us for descriptive purposes only and are not legal entities. Unless otherwise indicated, all references in this Form 10-K to “Berkley,” “we,” “us,” “our,” the “Company” or similar terms refer to W. R. Berkley Corporation together with its subsidiaries and operating units. W. R. Berkley Corporation is a Delaware corporation formed in 1970.

Insurance

Our U.S.-based operating units predominantly underwrite commercial insurance business primarily throughout the United States, although many units offer coverage globally, focusing on the following general areas:

Excess & Surplus Lines: A number of our operating units are dedicated to the U.S. excess and surplus lines market. They serve a highly diverse group of customers that often have complex risk or unique exposures that typically fall outside the underwriting guidelines of the standard insurance market. Lines of business underwritten by our excess and surplus lines operating units include premises operations, commercial automobile, property, products liability and professional liability lines. Products are generally distributed through wholesale agents and brokers.

Industry Specialty: Certain other operating units focus on providing specialty coverages to customers within a particular industry that are best served by underwriters and claims professionals with specialized knowledge of that industry. They offer multiple lines of business with policies tailored to address these unique exposures, often with the flexibility of providing coverages on either an admitted or a non-admitted basis in the U.S., as well as internationally. Each operating unit delivers its products through one or more distribution channels, including retail and wholesale agents, brokers, and managing general agents (MGAs), depending on the customer and the particular risks insured.

Product Specialty: Other operating units specialize in providing specific lines of insurance coverage, such as workers’ compensation or professional liability, to a wide range of customers. They offer insurance products, analytical tools and risk management services such as loss control and claims management that enable clients to manage their risk appropriately. Business is typically written on an admitted basis, although some units may offer non-admitted products in the U.S. and offer products internationally. Independent agents and brokers are the primary means of distribution.

Regional: Certain operating units offer standard insurance products and services focused on meeting the specific needs of a geographically differentiated customer base. Key clients of these units are small-to-midsized businesses. These regionally focused operating units provide a broad array of commercial insurance products to customers primarily in 45 states and the District of Columbia and have developed expertise in niches that reflect local economies. They are organized geographically in order to provide them with the flexibility to adapt quickly to local market conditions and customer needs.

In addition, through our non-U.S. insurance operating units, we write business in more than 60 countries worldwide, with branches or offices in 26 locations outside the United States, including the United Kingdom, Continental Europe, South America, Canada, Mexico, Scandinavia, Asia and Australia. In each of our operating territories, we have built decentralized structures that allow products and services to be tailored to each regional customer base. Our businesses are managed by teams of professionals with expertise in local markets and knowledge of regional environments.

In addition to providing insurance products, certain operating units also provide a wide variety of fee-based services, including claims, administrative and consulting services.

Operating units comprising the Insurance segment are as follows:

Acadia Insurance is a Northeast regional property casualty underwriter offering a broad portfolio of products exclusively through local independent agents in Connecticut, Maine, Massachusetts, New Hampshire, New York and Vermont. In addition to its general offerings, Acadia has specialized expertise in insuring regional industries such as construction, lumber, fishing and transportation.

Admiral Insurance provides excess and surplus lines coverage for commercial risks that generally consist of hard-to- place, specialized risks that involve moderate to high degrees of hazard. Its lines of business include general liability, professional liability, property, and excess and umbrella coverage. Admiral's professional liability and program operations include special coverages for technology, ambulatory surgery centers, chiropractors and concierge physicians. Its products are distributed exclusively by wholesale brokers.

American Mining Insurance Group specializes in mono-line workers’ compensation coverage for mining and mining related and high hazard industries in select states. 

Berkley Accident and Health underwrites accident and health insurance and reinsurance products in four primary areas: medical stop loss, managed care, special risk and group captive. It has a diversified product and service portfolio serving a range of clients from small employers, health care organizations, and membership groups to Fortune 500 companies.

2

Berkley Agribusiness Risk Specialists offers insurance for larger commercial risks across the United States involved in the supply, storage, handling, processing and distribution of commodities related to the agriculture and food industries.     

Berkley Alliance Managers specializes in professional liability for the design professional, construction professional and certified public accounting industries. The Berkley Design Professional division specializes in architects, engineers and consultants. The Berkley Construction Professional division provides both project specific and annual policies for owners and contractors. The Accountants division insures mainly mid-sized CPA firms.

Berkley Aspire provides excess and surplus lines coverage on a national basis to small to medium-sized insureds with low to moderate insurance risk. Its product lines include general liability, liquor liability and some property and inland marine coverage. It serves a limited distribution channel consisting of select Berkley member company agents.

Berkley Canada underwrites specialty, casualty and surety lines of business on behalf of the Canadian branch of Berkley Insurance Company. It specializes in commercial casualty and professional liability, and offers a broad portfolio of risk products that include commercial general liability, umbrella, professional liability, directors and officers, commercial property and surety, in addition to niche products for specific industries such as technology, life sciences and travel.

Berkley Custom Insurance focuses on the excess casualty insurance market and offers umbrella liability, pollution liability, excess liability, construction wrap-ups and completed operations coverages to wholesalers, retailers, manufacturers, insurance companies, financial institutions and construction companies.

Berkley Cyber Risk Solutions focuses on insurance and risk management products that respond to the changing cyber security vulnerabilities of organizations around the world. It offers specialty commercial cyber insurance coverages on a worldwide basis to clients of all sizes.

Berkley Entertainment underwrites property casualty insurance products, both on an admitted and non-admitted basis, for clients in the entertainment industry and sports-related organizations.

Berkley Environmental underwrites specialty insurance products for environmental customers such as contractors, consultants and owners of sites and facilities.

Berkley Europe is comprised of specialist operating units offering a focused range of insurance products to markets in Continental Europe and Nordic countries.

Berkley FinSecure serves the insurance needs of companies in the financial services industry. It offers a comprehensive range of property, casualty, professional liability, and specialty lines insurance products. Its Berkley crime division provides crime-related insurance products for commercial organizations, financial institutions and governmental entities.

Berkley Fire & Marine offers a broad range of preferred inland marine and related property risks and services to customers throughout the United States. Products are distributed through independent agents and brokers.

Berkley Global Product Recall Management provides worldwide insurance protection and technical assistance to help clients with the prevention, management and indemnification of product recall and contamination events.

Berkley Healthcare provides customized, comprehensive management and professional liability solutions for the full spectrum of healthcare providers.

Berkley Human Services provides property casualty insurance coverages to human services organizations, including nonprofit and for-profit organizations, public schools, sports and recreational organizations, and special events. Its product offerings include traditional primary coverages and risk purchasing groups, as well as alternative market solutions for clients who wish to retain a larger share of their risks.

Berkley Insurance Asia underwrites specialty commercial insurance coverages to clients in North Asia and Southeast Asia through offices in Hong Kong, Singapore and Shanghai.

Berkley Insurance Australia underwrites general insurance business in Australia, including professional indemnity insurance for companies of all sizes.

Berkley Latinoamérica is a leading provider of property, casualty, automobile, surety, group life and workers' compensation products and services in its operating territories of Argentina, Brazil, the Caribbean, Colombia, Mexico and Uruguay.

Berkley Life Sciences offers a comprehensive spectrum of property, casualty, and specialty products such as professional and management liability to the life sciences industry on a global basis, including both primary and excess liability coverages. It serves pharmaceutical and biotech companies, medical device companies, dietary supplement companies, medical and research related software developers, contract research and manufacturing organizations, research institutions and organizations, and other related businesses.

3

Berkley Luxury Group provides commercial package insurance programs for high-end cooperative, condominium, and quality rental apartment buildings and upscale restaurants in the New York, New Jersey, Chicago and Washington, D.C. metropolitan markets, as well as other select markets.

Berkley Medical Excess insures healthcare organizations such as hospitals and clinics that retain a portion of their risk exposure through a self-funded mechanism and seek to maximize the effectiveness and efficiency of their excess risk financing program.

Berkley Mid-Atlantic Group provides commercial property casualty coverages to a wide variety of businesses in Delaware, the District of Columbia, Maryland, Ohio, Pennsylvania, and Virginia. Focusing on middle market accounts, it complements its standard writings with specialized products in areas such as construction.

Berkley Net Underwriters focuses on small and medium-sized commercial risks, using a web-based system to allow producers to quote, bind and service workers' compensation insurance products on behalf of Berkley member insurance companies. Berkley Net Underwriters also manages Berkley's assigned risk servicing carrier operations.

Berkley North Pacific provides local underwriting, claims and risk management services for businesses in the Northwest. It operates with a select group of agents in Idaho, Montana, Oregon, Utah and Washington to sell and service property and casualty policies for larger middle-market standard businesses and specialty lines, such as construction, restaurants and manufacturing.

Berkley Offshore Underwriting Managers is a specialist global underwriter of energy and marine risks. Its three divisions provide specialty insurance products in the energy upstream, energy liability and marine sectors.    

Berkley Oil & Gas provides property casualty products and risk services to the United States energy sector. Its customer base includes risks of all sizes that work in the oil patch, including operators, drillers, geophysical contractors, well-servicing contractors, and manufacturers/distributors of oil field products, as well as those in the renewable energy sector.    

Berkley One provides a customizable suite of personal lines insurance solutions including home, condo/co-op, auto, liability and collectibles. Berkley One targets high net worth individuals and families with sophisticated risk management needs.

Berkley Professional Liability specializes in professional liability insurance for publicly-traded and private entities on a worldwide basis. Its liability coverages include directors and officers, errors and omissions, fiduciary, employment practices, and sponsored insurance agents' errors and omissions. Berkley Transactional, a division of Berkley Professional Liability, underwrites a full suite of transactional insurance products, including representations and warranties insurance, tax opinion insurance and contingency liability insurance.

Berkley Program Specialists is a program management company offering both admitted and non-admitted insurance support on a nationwide basis for commercial casualty and property program administrators with specialized insurance expertise. Its book is built around blocks of homogeneous business, or programs, allowing for efficient processes, effective oversight of existing programs and sound implementation of new programs.    

Berkley Public Entity specializes in providing excess coverage and services to individual governmental and scholastic entities and intergovernmental risk sharing groups. Products include general liability, automobile liability, law enforcement liability, public officials and educator's legal liability, employment practices liability, incidental medical, property and crime.

Berkley Risk provides at-risk and alternative risk insurance program management services for a broad range of groups and individuals including public entity pools, professional associations, captives and self-insured clients. As a third party administrator, it manages workers’ compensation, liability and property claims nationwide.

Berkley Select specializes in underwriting professional liability insurance on a surplus lines basis for law firms and accounting firms through a limited number of brokers. It also offers executive and professional liability products, including directors and officers liability, errors and omissions, and employment practices liability, to small to middle market privately held and not for profit customers on both an admitted and surplus lines basis.    

Berkley Southeast offers a wide array of commercial lines products in six southeastern states: Alabama, Georgia, Mississippi, North Carolina, South Carolina and Tennessee, specializing in small to mid-sized accounts.    

Berkley Surety provides a broad array of surety products for contract and commercial surety risks in the U.S. and Canada, including specialty niches such as environmental and secured credit for small contractors, through an independent agency and broker platform across a network of 21 field offices.    

Berkley Technology Underwriters provides a broad range of first and third-party insurance programs for technology exposures and technology industries on both a local and global basis.

Carolina Casualty is a national provider of primary commercial insurance products and services to the transportation industry. It underwrites on an admitted basis in all 50 states and the District of Columbia.

4

Continental Western Group is a Midwest regional property and casualty insurance operation based in Des Moines, Iowa, providing underwriting and risk management services to a broad array of regional businesses in thirteen Midwest states. In addition to its generalist portfolio, Continental Western offers specialty underwriting solutions for diversified agriculture, construction, light manufacturing, transportation, volunteer fire departments, rural utilities and public entities.

Gemini Transportation is a national provider of excess liability insurance for various domestic surface transportation businesses. It underwrites liability insurance policies for the railroad industry as well as excess liability policies for the trucking, busing and other industries that use rubber-wheeled vehicles for over-the-road use.

Intrepid Direct offers business coverages to franchise restaurants and auto repair garages on a direct basis.

Key Risk is a premier provider of workers' compensation insurance.  It focuses on middle market accounts in several niches that appreciate expertise and exceptional service. The unit operates two business units; one focused on middle market accounts located primarily in the mid-Atlantic and southeastern United States and one focused on national temporary staffing and United States Longshoreman & Harbor Act (USL&H) specialty programs. Its products are distributed by a select group of independent retail agents and wholesale brokers located through the United States.

Midwest Employers Casualty provides excess workers' compensation insurance products to individual employers, groups and workers' compensation insurance companies across the United States. Its workers' compensation excess of loss products include self-insured excess of loss coverages and large deductible policies. Through its relationship with Berkley Net Underwriters, Midwest Employers Casualty also offers multi-state coverage for group self-insureds. It has developed sophisticated, proprietary analytical tools and risk management services that help its insureds lower their total cost of risk.

Nautilus Insurance Group insures excess and surplus lines risks for small to medium-sized commercial risks with low to moderate susceptibility to loss. It writes commercial excess and surplus lines business nationwide and admitted lines commercial business in a limited number of states. A substantial portion of Nautilus' business is written through its close, long-standing network of general agents, who are chosen on a highly selective basis.

Preferred Employers Insurance focuses exclusively on workers' compensation products and services for businesses in California. It serves over 12,000 customers covering a broad spectrum of industries throughout the state.    

Union Standard offers preferred commercial property and casualty insurance products and services to a wide range of small to medium size commercial entities through independent agents in Arizona, Arkansas, New Mexico, Oklahoma and Texas.

Vela Insurance Services specializes in commercial casualty insurance on an excess and surplus lines basis. Its primary focus is on general liability insurance for construction, manufacturing and general casualty clients as well as products liability and miscellaneous professional liability coverages distributed through wholesale insurance brokers.

Verus Underwriting Managers offers general liability, professional liability and property coverages for small to mid-sized commercial risks in the excess and surplus lines insurance market through a select group of appointed wholesale brokers and agents.

W / R / B Underwriting provides a broad range of leading insurance products to the Lloyd's marketplace, with a concentration in specialist classes of business including property, professional indemnity, crisis management, personal accident and asset protection.

5

The following table sets forth the percentage of gross premiums written by each Insurance operating unit:

	Year Ended December 31,
	2018	2017	2016	2015	2014
Acadia Insurance	6.5%	6.8%	6.8%	6.7%	7.2%
Admiral Insurance	5.7	5.7	5.5	4.9	5.3
American Mining Insurance Group	0.9	0.8	0.7	0.8	0.7
Berkley Accident and Health	5.6	4.7	4.4	3.7	2.9
Berkley Agribusiness Risk Specialists	1.2	1.2	1.1	0.9	0.9
Berkley Alliance Managers	2.5	1.9	1.5	0.7	0.1
Berkley Aspire	0.3	0.3	0.3	0.3	0.4
Berkley Canada	1.0	0.9	0.8	0.6	0.5
Berkley Custom Insurance	2.6	2.5	2.7	2.9	2.4
Berkley Cyber Risk Solutions	0.2	0.1	—	—	—
Berkley Entertainment	2.5	2.1	2.0	1.9	1.8
Berkley Environmental	5.0	4.7	4.1	3.8	3.5
Berkley Europe	1.9	1.7	1.7	1.9	2.4
Berkley FinSecure	0.9	1.0	0.9	1.0	0.7
Berkley Fire & Marine	0.6	0.5	0.4	0.3	0.2
Berkley Global Product Recall Management	0.5	0.3	0.2	—	—
Berkley Healthcare	0.3	0.2	0.2	—	—
Berkley Human Services	0.7	0.6	0.7	0.6	0.6
Berkley Insurance Asia	0.4	0.2	—	—	—
Berkley Insurance Australia	1.1	1.0	1.0	0.8	1.3
Berkley Latinoamérica	4.1	4.8	4.2	4.7	4.6
Berkley Life Sciences	0.8	0.8	0.8	0.8	0.9
Berkley Luxury Group	1.4	1.3	1.3	1.3	1.3
Berkley Medical Excess	0.9	0.9	0.8	0.9	0.8
Berkley Mid-Atlantic Group	1.2	1.1	1.2	1.8	2.4
Berkley Net Underwriters	4.9	6.7	8.0	4.0	3.7
Berkley North Pacific	1.2	1.5	1.5	1.7	1.6
Berkley Offshore Underwriting Managers	1.1	1.1	1.1	1.4	1.7
Berkley Oil & Gas	3.5	2.7	2.8	3.2	3.5
Berkley One	0.2	—	—	—	—
Berkley Professional Liability	1.8	1.6	1.5	1.7	1.8
Berkley Program Specialists	1.1	1.2	1.2	1.2	1.2
Berkley Public Entity	0.4	0.5	0.5	0.4	0.4
Berkley Risk	0.2	0.2	0.2	4.0	3.9
Berkley Select	3.1	3.4	3.9	4.0	4.0
Berkley Southeast	2.0	1.9	2.0	2.3	2.5
Berkley Surety	1.3	1.2	1.2	1.2	1.2
Berkley Technology Underwriters	0.7	0.7	0.6	0.5	0.4
Carolina Casualty	0.5	0.4	0.6	1.2	1.8
Continental Western Group	3.4	3.8	4.0	4.0	3.9
Gemini Transportation	2.3	2.1	1.8	1.1	0.9
Intrepid Direct	0.3	0.1	—	—	—
Key Risk	2.8	2.7	2.6	2.9	3.0
Midwest Employers Casualty	2.5	2.5	2.3	2.3	2.3
Nautilus Insurance Group	4.9	5.1	5.0	4.7	4.7
Preferred Employers Insurance	2.4	2.8	2.6	2.5	2.1
Union Standard	2.6	2.7	2.6	2.6	2.7

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Vela Insurance Services	2.6		3.0		3.9		3.3		3.2
Verus Underwriting Managers	0.9		0.9		0.9		0.8		0.8
W/R/B Underwriting	3.4		3.1		4.0		5.5		7.2
Other	1.1		2.0		1.9		2.2		0.9
Total	100.0	%	100.0	%	100.0	%	100.0	%	100.0	%

The following table sets forth percentages of gross premiums written, by line, by our Insurance operations:

	Year Ended December 31,
	2018	2017	2016	2015	2014
Other liability	31.6%	30.6%	30.9%	28.9%	28.3%
Short-tail lines (1)	22.9	22.8	23.1	24.3	25.9
Workers' compensation	22.6	24.6	25.1	25.5	24.2
Professional liability	11.7	11.0	10.5	10.0	9.9
Commercial auto	11.2	11.0	10.4	11.3	11.7
Total	100.0%	100.0%	100.0%	100.0%	100.0%

___________________

(1) Short-tail lines include commercial multi-peril (non-liability), inland marine, accident and health, fidelity and surety, boiler    and machinery and other lines.

Reinsurance

We provide other insurance companies and self-insureds with assistance in managing their net risk through reinsurance on either a portfolio basis, through treaty reinsurance, or on an individual basis, through facultative reinsurance.

Operating units comprising the Reinsurance segment are as follows:

Berkley Re America provides treaty and facultative reinsurance solutions on a variety of product lines through reinsurance brokers to companies whose primary operations are within the United States and Canada.

Berkley Re Asia Pacific provides property and casualty reinsurance to the Asia Pacific marketplace. With offices in Brisbane, Melbourne, Sydney, Beijing, Hong Kong and Singapore, each branch focuses on excess of loss reinsurance, targeting both property and casualty treaty and facultative contracts, through multiple distribution channels.

Berkley Re Solutions is a direct casualty facultative reinsurance underwriter serving clients through a nationwide network of regional offices. Its facultative reinsurance products include automatic, semi-automatic and individual risk assumed reinsurance. It also provides its customers with turnkey products such as cyber, employment practices liability insurance ("EPLI"), and liquor liability insurance to help enhance their clients' product offerings, along with underwriting, claims, and actuarial consultation.

Berkley Re UK writes international property casualty treaty accounts. Its territorial scope includes reinsured clients domiciled in the United Kingdom, Europe, Africa, the Middle East and the Caribbean.

Lloyd's Syndicate 2791 Participation represents the Company's minority participation in a Lloyd's syndicate that writes a broad range of mainly short-tail classes of business.

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The following table sets forth the percentages of gross premiums written by each Reinsurance operating unit:

	Year Ended December 31,
	2018		2017		2016		2015		2014
Berkley Re America	42.0	%	52.0	%	64.0	%	60.3	%	56.2	%
Berkley Re Asia Pacific	14.8		12.8		9.2		8.0		6.7
Berkley Re Solutions	14.1		15.8		10.8		10.1		10.4
Berkley Re UK	22.2		12.6		10.0		15.4		19.9
Lloyd's Syndicate 2791 Participation	6.8		5.5		4.4		5.2		5.3
Other	0.1		1.3		1.6		1.0		1.5
Total	100.0	%	100.0	%	100.0	%	100.0	%	100.0	%

The following table sets forth the percentages of gross premiums written, by line, by our Reinsurance operations:

	Year Ended December 31,
	2018		2017		2016		2015		2014
Casualty	70.2	%	66.9	%	58.7	%	65.1	%	65.5	%
Property	29.8		33.1		41.3		34.9		34.5
Total	100.0	%	100.0	%	100.0	%	100.0	%	100.0	%

Results by Segment

Summary financial information about our segments is presented on a GAAP basis in the following table:

	Year Ended December 31,
(In thousands)	2018			2017			2016			2015			2014
Insurance
Revenue	$	6,456,441		$	6,229,485		$	6,148,210		$	5,876,454		$	5,586,230
Income before income taxes	856,011			756,153			799,139			748,515			786,723
Reinsurance
Revenue	600,815			696,122			777,123			745,325			837,901
Income (loss) before income taxes	62,144			(15,276		)	98,277			122,930			155,042
Other(1)
Revenue	634,395			759,157			728,851			584,678			704,797
(Loss) income before income taxes	(106,061		)	31,893			(978		)	(139,415		)	10,431
Total
Revenue	$	7,691,651		$	7,684,764		$	7,654,184		$	7,206,457		$	7,128,928
Income before income taxes	$	812,094		$	772,770		$	896,438		$	732,030		$	952,196

_______________________________________

(1) Represents corporate revenues, corporate expenses, net investment gains and losses, and revenues and expenses from non-insurance businesses that are consolidated for financial reporting purposes.

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The table below represents summary underwriting ratios on a GAAP basis for our segments. Loss ratio is losses and loss expenses incurred expressed as a percentage of net premiums earned. Expense ratio is underwriting expenses expressed as a percentage of net premiums earned. Underwriting expenses do not include expenses related to insurance services or unallocated corporate expenses. Combined ratio is the sum of the loss ratio and the expense ratio. The combined ratio represents a measure of underwriting profitability, excluding investment income. A number in excess of 100 indicates an underwriting loss; a number below 100 indicates an underwriting profit:

	Year Ended December 31,
	2018		2017		2016		2015		2014
Insurance
Loss ratio	61.8	%	61.6	%	61.0	%	60.8	%	60.8	%
Expense ratio	32.5		32.9		32.5		32.6		32.8
Combined ratio	94.3	%	94.5	%	93.5	%	93.4	%	93.6	%
Reinsurance
Loss ratio	68.7	%	80.2	%	61.6	%	58.2	%	60.5	%
Expense ratio	37.7		37.4		39.0		38.4		34.6
Combined ratio	106.4	%	117.6	%	100.6	%	96.6	%	95.1	%
Total
Loss ratio	62.4	%	63.4	%	61.1	%	60.5	%	60.8	%
Expense ratio	32.9		33.3		33.2		33.2		33.0
Combined ratio	95.3	%	96.7	%	94.3	%	93.7	%	93.8	%

Investments

Investment results, before income taxes, were as follows:

	Year Ended December 31,
(In thousands)	2018			2017			2016			2015			2014
Average investments, at cost (1)	$	18,392,297		$	17,530,590		$	16,730,964		$	15,970,931		$	15,560,335
Net investment income (1)	$	674,235		$	575,788		$	564,163		$	512,645		$	600,885
Percent earned on average investments (1)	3.7		%	3.3		%	3.4		%	3.2		%	3.9		%
Net realized and unrealized gains on investments (2)	$	154,488		$	335,858		$	267,005		$	92,324		$	254,852
Change in unrealized investment (losses) gains (3)	$	(302,737	)	$	(69,425	)	$	371,715		$	(192,186	)	$	72,889

_______________________________________

(1) Includes investments, cash and cash equivalents, trading accounts receivable from brokers and clearing organizations, trading account securities sold but not yet purchased and unsettled purchases.

(2) Represents realized gains on investments not classified as trading account securities prior to 2018. The inclusion of change in unrealized gains on equity securities within net income commenced January 1, 2018 due to our adoption of ASU 2016-01. For the twelve months ended December 31, 2018, includes net realized gains on investment sales of $480 million reduced by a change in unrealized gains on equity securities of $320 million.

(3) Represents the change in unrealized investment (losses) gains for available for sale securities. Effective January 1, 2018, the Company adopted new accounting guidance that requires all equity investments with readily determinable fair values (subject to certain exceptions) to be measured at fair value with changes in the fair value recognized in net income. As a result of this guidance, the Company recorded a cumulative effect adjustment of $291 million that increased retained earnings and decreased accumulated other comprehensive income ("AOCI"), resulting in no net impact to total stockholders' equity.

For comparison, the following are the coupon returns for the Barclays U.S. Aggregate Bond Index and the dividend returns for the S&P 500^® Index:

	Year Ended December 31,
	2018		2017		2016		2015		2014
Barclays U.S. Aggregate Bond Index	3.0	%	3.0	%	3.0	%	3.0	%	3.2	%
S&P 500® Index	2.0		2.4		2.4		2.1		2.1

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The percentages of the fixed maturity portfolio categorized by contractual maturity, based on fair value, on the dates indicated, are set forth below. Actual maturities may differ from contractual maturities because certain issuers may have the right to call or prepay certain obligations.

	Year Ended December 31,
	2018		2017		2016		2015		2014
1 year or less	6.9	%	5.0	%	7.9	%	5.8	%	7.0	%
Over 1 year through 5 years	34.3		37.2		39.6		33.6		32.4
Over 5 years through 10 years	22.3		24.8		24.6		30.5		29.8
Over 10 years	24.7		23.3		18.8		20.3		20.4
Mortgage-backed securities	11.8		9.7		9.1		9.8		10.4
Total	100.0	%	100.0	%	100.0	%	100.0	%	100.0	%

At December 31, 2018, the fixed maturity portfolio had an effective duration of 2.8 years, including cash and cash equivalents.

Loss and Loss Expense Reserves

To recognize liabilities for unpaid losses, either known or unknown, insurers establish reserves, which is a balance sheet account representing estimates of future amounts needed to pay claims and related expenses with respect to insured events which have occurred. Estimates and assumptions relating to reserves for losses and loss expenses are based on complex and subjective judgments, often including the interplay of specific uncertainties with related accounting and actuarial measurements. Such estimates are also susceptible to change as significant periods of time may elapse between the occurrence of an insured loss, the report of the loss to the insurer, the ultimate determination of the cost of the loss and the insurer’s payment of that loss.

In general, when a claim is reported, claims personnel establish a “case reserve” for the estimated amount of the ultimate payment based upon known information about the claim at that time. The estimate represents an informed judgment based on general reserving practices and reflects the experience and knowledge of the claims personnel regarding the nature and value of the specific type of claim. Reserves are also established on an aggregate basis to provide for losses incurred but not reported (“IBNR”) to the insurer, potential inadequacy of case reserves and the estimated expenses of settling claims, including legal and other fees and general expenses of administrating the claims adjustment process. Reserves are established based upon the then current legal interpretation of coverage provided.

In examining reserve adequacy, several factors are considered in estimating the ultimate economic value of losses. These factors include, among others, historical data, legal developments, changes in social attitudes and economic conditions, including the effects of inflation. The actuarial process relies on the basic assumption that past experience, adjusted judgmentally for the effects of current developments and anticipated trends, is an appropriate basis for predicting future outcomes. Reserve amounts are necessarily based on management’s informed estimates and judgments using currently available data. As additional experience and other data become available and are reviewed, these estimates and judgments may be revised. This may result in reserve increases or decreases that would be reflected in our results in periods in which such estimates and assumptions are changed.

The risk and complexity of estimating loss reserves are greater when economic conditions are uncertain. It is especially difficult to estimate the impact of inflation on loss reserves given the current economic environment and related government actions. Whereas a slowing economy would generally lead to lower inflation or even deflation, increased government spending would generally lead to higher inflation. A change in our assumptions regarding inflation would result in reserve increases or decreases that would be reflected in our earnings in periods in which such assumptions are changed.

Reserves do not represent an exact calculation of liability. Rather, reserves represent an estimate of what management expects the ultimate settlement and claim administration will cost. While the methods for establishing the reserves are well tested over time, some of the major assumptions about anticipated loss emergence patterns are subject to unanticipated fluctuation. These estimates, which generally involve actuarial projections, are based on management’s assessment of facts and circumstances then known, as well as estimates of trends in claims severity and frequency, judicial theories of liability and other factors, including the actions of third parties, which are beyond the Company’s control. These variables are affected by external and internal events, such as inflation and economic volatility, judicial and litigation trends, reinsurance coverage, legislative changes and claim handling and reserving practices, which make it more difficult to accurately predict claim costs. The inherent uncertainties of estimating reserves are greater for certain types of liabilities where long periods of time elapse before a definitive determination of liability is made. Although the loss reserves included in the Company’s financial statements represent management’s best estimates, setting reserves is inherently uncertain and the Company cannot provide assurance that its current reserves will prove adequate in light of subsequent events.

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The Company discounts its liabilities for certain workers’ compensation reserves. The amount of workers’ compensation reserves that were discounted was $1,793 million and $1,855 million at December 31, 2018 and 2017, respectively. The aggregate net discount for those reserves, after reflecting the effects of ceded reinsurance, was $563 million and $591 million at December 31, 2018 and 2017, respectively. At December 31, 2018, discount rates by year ranged from 2.0% to 6.5%, with a weighted average discount rate of 3.8%.

Substantially all discounted workers’ compensation reserves (97% of total discounted reserves at December 31, 2018) are excess workers’ compensation reserves. In order to properly match loss expenses with income earned on investment securities supporting the liabilities, reserves for excess workers’ compensation business are discounted using risk-free discount rates determined by reference to the U.S. Treasury yield curve. These rates are determined annually based on the weighted average rate for the period. Once established, no adjustments are made to the discount rate for that period, and any increases or decreases in loss reserves in subsequent years are discounted at the same rate, without regard to when any such adjustments are recognized. The expected loss and loss expense payout patterns subject to discounting are derived from the Company’s loss payout experience.  

The Company also discounts reserves for certain other long-duration workers’ compensation reserves (representing approximately 3% of total discounted reserves at December 31, 2018), including reserves for quota share reinsurance and reserves related to losses regarding occupational lung disease. These reserves are discounted at statutory rates permitted by the Department of Insurance of the State of Delaware.

To date, known environmental and asbestos claims have not had a material impact on the Company’s operations, because its subsidiaries generally did not insure large industrial companies that are subject to significant environmental or asbestos exposures prior to 1986 when an absolute exclusion was incorporated into standard policy language.

The Company’s net reserves for losses and loss expenses relating to asbestos and environmental claims on policies written before adoption of the absolute exclusion was $28 million at December 31, 2018 and $30 million at December 31, 2017. The estimation of these liabilities is subject to significantly greater than normal variation and uncertainty because it is difficult to make an actuarial estimate of these liabilities due to the absence of a generally accepted actuarial methodology for these exposures and the potential effect of significant unresolved legal matters, including coverage issues, as well as the cost of litigating the legal issues. Additionally, the determination of ultimate damages and the final allocation of such damages to financially responsible parties are highly uncertain.

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The table below provides a reconciliation of the beginning of year and end of year property casualty reserves for the indicated years:

(In thousands)	2018			2017			2016
Net reserves at beginning of year	$	10,056,914		$	9,590,265		$	9,244,872
Net provision for losses and loss expenses:
Claims occurring during the current year (1)	3,926,489			3,963,543			3,826,620
Increase (decrease) in estimates for claims occurring in prior years (2)	6,831			(5,165		)	(29,904		)
Loss reserve discount amortization	41,382			43,970			49,084
Total	3,974,702			4,002,348			3,845,800
Net payments for claims:
Current year	964,808			1,027,405			1,052,452
Prior years	2,700,077			2,562,550			2,401,722
Total	3,664,885			3,589,955			3,454,174
Foreign currency translation	(117,848		)	54,256			(46,233		)
Net reserves at end of year	10,248,883			10,056,914			9,590,265
Ceded reserves at end of year	1,717,565			1,613,494			1,606,930
Gross reserves at end of year	$	11,966,448		$	11,670,408		$	11,197,195
Net change in premiums and losses occurring in prior years:
(Increase) decrease in estimates for claims occurring in prior years (2)	$	(6,831	)	$	5,165		$	29,904
Retrospective premium adjustments for claims occurring in prior years (3)	45,638			32,162			29,000
Net favorable premium and reserve development on prior years	$	38,807		$	37,327		$	58,904

____________________________________

(1) Claims occurring during the current year are net of loss reserve discounts of $24,381,000, $22,064,000 and $18,929,000 in 2018, 2017 and 2016, respectively.

(2) The increase (decrease) in estimates for claims occurring in prior years is net of loss reserve discount. On an undiscounted basis, the estimates for claims occurring in prior years decreased by $3,738,000 in 2018, $32,132,000 in 2017 and $59,175,000 in 2016, respectively.

(3) For certain retrospectively rated insurance polices and reinsurance agreements, changes in loss and loss expenses for prior years are offset by additional or return premiums.

Also, see Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and note 13, Reserves for Losses and Loss Expenses included in our audited consolidated financial statements for further information regarding the changes in estimates for claims occurring in prior years.

A reconciliation between the reserves as of December 31, 2018 as reported in the accompanying consolidated GAAP financial statements and those reported on the basis of statutory accounting principles (“SAP”) in the Company’s U.S. regulatory filings is as follows:

(In thousands)
Net reserves reported in U.S. regulatory filings on a SAP basis	$	9,819,932
Reserves for non-U.S. companies	479,939
Loss reserve discounting (1)	(50,988		)
Ceded reserves	1,717,565
Gross reserves reported in the consolidated GAAP financial statements	$	11,966,448

_________________________

(1) For statutory purposes, the Company discounts its workers’ compensation reinsurance reserves at 3.3% as prescribed or permitted by the Department of Insurance of the State of Delaware. In its GAAP financial statements, the Company discounts excess workers’ compensation reserves at the risk-free rate and assumed workers’ compensation reserves at the statutory rate.

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Reinsurance

We follow a common industry practice of reinsuring a portion of our exposures and paying to reinsurers a portion of the premiums received on the policies that we write. Reinsurance is purchased principally to reduce net liability on individual risks and to protect against catastrophic losses. Although reinsurance does not legally discharge an insurer from its primary liability for the full amount of the policies, it does make the assuming reinsurer contractually liable to the insurer to the extent of the reinsurance coverage. We monitor the financial condition of our reinsurers and attempt to place our coverages only with substantial, financially sound carriers. As a result, generally the reinsurers who reinsure our casualty insurance must have an A.M. Best rating of “A (Excellent)” or better with at least $1 billion in policyholder surplus and the reinsurers who cover our property insurance must have an A.M. Best rating of “A- (Excellent)” or better with at least $1 billion in policyholder surplus.

Regulation

U.S. Regulation 

Our U.S. insurance subsidiaries are subject to varying degrees of regulation and supervision in the jurisdictions in which they do business.

Overview. Our domestic insurance subsidiaries are subject to statutes which delegate regulatory, supervisory and administrative powers to state insurance commissioners. This regulation relates to such matters as the standards of solvency which must be met and maintained; the licensing of insurers and their agents; the nature of and limitations on investments; deposits of securities for the benefit of policyholders; approval of certain policy forms and premium rates; periodic examination of the affairs of insurance companies; annual and other reports required to be filed on the financial condition of insurers or for other purposes; establishment and maintenance of reserves for unearned premiums, loss expenses and losses; and requirements regarding numerous other matters. Our property casualty subsidiaries, other than excess and surplus and reinsurance subsidiaries, must generally file all rates with the insurance department of each state in which they operate. Our excess and surplus and reinsurance subsidiaries generally operate free of rate and form regulation. 

Holding Company Statutes. In addition to regulatory supervision of our insurance subsidiaries, we are subject to state statutes governing insurance holding company systems. Under the terms of applicable state statutes, any person or entity desiring to purchase more than a specified percentage (commonly 10%) of our outstanding voting securities would be required to obtain prior regulatory approval of the purchase. Typically, such statutes require that we periodically file information with the appropriate state insurance commissioner, including information concerning our capital structure, ownership, financial condition and general business operations.

In addition, we must annually submit to our lead state regulator an “enterprise risk management report” which identifies the activities and circumstances of any affiliated company that might have a material adverse effect on the financial condition of our group or our U.S. licensed insurers.

Approximately half the states have also adopted changes to the holding company act that authorize U.S. insurance regulators to lead or participate in the group-wide supervision of certain international insurance groups. International standard setters, such as the International Association of Insurance Supervisors (“IAIS”), are developing capital standards for international groups, and U.S. insurance regulators are currently working on U.S. group capital standards for insurance groups. In 2019, the IAIS expects to conduct the final round of field testing of the insurance capital standard for internationally active insurance groups. The U.S. group capital calculation is expected to incorporate existing risk-based capital standards. The National Association of Insurance Commissioners (“NAIC”) intends to enter the next phase of development by field testing the calculation tool in early 2019 using year-end 2018 data. It is unclear how the development of group capital measures will interact with existing capital requirements for insurance companies in the United States and with international capital standards. It is possible that we may be required to hold additional capital as a result of these developments.

Most states have adopted the NAIC's Risk Management and Own Risk and Solvency Assessment Model Act (the “ORSA Model Act”), which requires an insurance holding company system’s chief risk officer to submit annually to its lead state insurance regulator an Own Risk and Solvency Assessment Summary Report (“ORSA”). The ORSA is a confidential internal assessment of the material and relevant risks associated with an insurer’s current business plan and the sufficiency of capital resources to support those risks. Under ORSA, we are required to:

• regularly, no less than annually, conduct an ORSA to assess the adequacy of our risk management framework, and current and estimated projected future solvency position;

• internally document the process and results of the assessment; and

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• provide a confidential high-level ORSA Summary Report annually to the Commissioner of Insurance of the State of Delaware (our lead state commissioner).

Cybersecurity Regulations. New York’s cybersecurity regulation for financial services institutions that are authorized by the New York State Department of Financial Services ("Part 500"), including our insurance subsidiaries licensed in New York, became effective on March 1, 2017. The regulation, which is being implemented in stages, requires these entities to establish and maintain a cybersecurity program designed to protect consumers’ private data and the confidentiality, integrity and availability of the licensee’s information systems. On October 24, 2017, the NAIC adopted the Insurance Data Security Model Law (the “Cybersecurity Model Law”), which establishes standards for data security, the investigation of cybersecurity events involving unauthorized access to, or the misuse of, certain nonpublic information, and reporting to insurance commissioners. The Cybersecurity Model Law imposes significant new regulatory burdens intended to protect the confidentiality, integrity and availability of information systems. Its implementation will be based on adoption by state legislatures. To date, the Cybersecurity Model Law has only been adopted in South Carolina. Importantly, a drafting note in the Cybersecurity Model Law states that a licensee’s compliance with the New York cybersecurity regulation is intended to constitute compliance with the Cybersecurity Model Law. We made the initial certifications as required by Part 500 for licensed entities. Finally, privacy and data security legislation has become an issue in many states and localities over the last 12 months. For example, in 2018 California enacted the California Consumer Privacy Act (“CCPA”), which broadly regulates the sale of California residents’ personal information and grants California residents certain rights to, among other things, access and delete data about them in certain circumstances. CCPA goes into effect on January 1, 2020, and compliance with the CCPA may increase the cost of providing our services in California. Other states have considered - and may adopt - similar proposals. We cannot predict the impact, if any, that any proposed or future cybersecurity regulations will have on our business, financial condition or results of operations.

Risk Based Capital Requirements. The NAIC utilizes a Risk Based Capital (“RBC”) formula that is designed to measure the adequacy of an insurer's statutory surplus in relation to the risks inherent in its business. The RBC formula develops a risk adjusted target level of adjusted statutory capital by applying certain factors to various asset, premium and reserve items. The NAIC RBC Model Law provides for four incremental levels of regulatory attention for insurers whose surplus is below the calculated RBC target. These levels of attention range in severity from requiring the insurer to submit a plan for corrective action to actually placing the insurer under regulatory control. The RBC of each of our domestic insurance subsidiaries was above any RBC action level as of December 31, 2018. 

Insurance Regulatory Information System. The NAIC also has developed a set of 13 financial ratios referred to as the Insurance Regulatory Information System (“IRIS”). On the basis of statutory financial statements filed with state insurance regulators, the NAIC annually calculates these IRIS ratios to assist state insurance regulators in monitoring the financial condition of insurance companies. The NAIC has established an acceptable range for each of the IRIS financial ratios. 

Guaranty Funds. Our U.S. insurance subsidiaries are also subject to assessment by state guaranty funds when an insurer in a particular jurisdiction has been judicially declared insolvent and the insolvent company's available funds are insufficient to pay policyholders and claimants the amounts to which they are entitled. The protection afforded under a state's guaranty fund to policyholders of the insolvent insurer varies from state to state. Generally, all licensed property casualty insurers are considered to be members of the fund, and assessments are based upon their pro rata share of direct written premiums in that state. The NAIC Post-Assessment Property and Liability Insurance Guaranty Association Model Act, which many states have adopted, limits assessments to an insurer to 2% of its subject premium and permits recoupment of assessments through rate setting. Likewise, several states (or underwriting organizations of which our insurance subsidiaries are required to be members) have limited assessment authority with regard to deficits in certain lines of business.

Additionally, state insurance laws and regulations require us to participate in mandatory property-liability “shared market,” “pooling” or similar arrangements that provide certain types of insurance coverage to individuals or others who otherwise are unable to purchase coverage voluntarily provided by private insurers. Shared market mechanisms include assigned risk plans and fair access to insurance requirement or “FAIR” plans. In addition, some states require insurers to participate in reinsurance pools for claims that exceed specified amounts. Our participation in these mandatory shared market or pooling mechanisms generally is related to the amount of our direct writings for the type of coverage written by the specific arrangement in the applicable state. 

Dividends. We receive funds from our insurance company subsidiaries in the form of dividends and management fees for certain management services. Annual dividends in excess of maximum amounts prescribed by state statutes may not be paid without the approval of the insurance commissioner of the state in which an insurance subsidiary is domiciled. See “Management's Discussion and Analysis of Financial Condition and Results of Operations-Liquidity and Capital Resources.” 

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

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 Investment Regulation. Investments by our domestic insurance companies must comply with applicable laws and regulations which prescribe the kind, quality and concentration of investments. In general, these laws and regulations permit investments in federal, state and municipal obligations, corporate bonds, preferred and common equity securities, mortgage loans, real estate and certain other investments, subject to specified limits and certain other qualifications. Investments that do not comply with these limits and qualifications are deducted in our insurance subsidiaries' calculation of their statutory capital and surplus.

Terrorism Risk Insurance. The Terrorism Risk Insurance Act of 2002 established a Federal program that provides for a system of shared public and private compensation for insured losses resulting from acts of terrorism. Pursuant to the Terrorism Risk Insurance Program Reauthorization Act of 2015 (“TRIPRA”), the program has been extended for a six year period ending on December 31, 2020. TRIPRA provides a federal backstop to all U.S. based property and casualty insurers for insurance related losses resulting from any act of terrorism on U.S. soil or against certain U.S. air carriers, vessels or foreign missions. TRIPRA is applicable to almost all commercial lines of property and casualty insurance but excludes commercial auto, burglary and theft, surety, professional liability and farm owners' multi-peril insurance. Insurers with direct commercial property and casualty insurance exposure in the United States are required to participate in the program and make available coverage for certified acts of terrorism. TRIPRA's definition of certified acts includes domestic terrorism. Federal participation will be triggered under TRIPRA when the Secretary of Treasury certifies an act of terrorism. Under the program, the federal government will currently pay 82% of an insurer's covered losses in excess of the insurer's applicable deductible. This amount will decrease to 80% on a pro-rata basis over five years, which began in 2017. The insurer's deductible is based on 20% of earned premium for the prior year for covered lines of commercial property and casualty insurance. Based on our 2018 earned premiums, our aggregate deductible under TRIPRA during 2019 will be approximately $969 million. The federal program will not pay losses for certified acts unless such losses exceed $180 million industry-wide for calendar year 2019. This threshold will increase to $200 million on a pro-rata basis over five years which began in 2016. TRIPRA limits the federal government's share of losses at $100 billion for a program year. In addition, an insurer that has satisfied its deductible is not liable for the payment of losses in excess of the $100 billion cap.

Excess and Surplus Lines. The regulation of our U.S. subsidiaries' excess and surplus lines insurance business differs significantly from the regulation of our admitted business. Our surplus lines subsidiaries are subject to the surplus lines regulation and reporting requirements of the jurisdictions in which they are eligible to write surplus lines insurance. Although the surplus lines business is generally less regulated than admitted business, principally with respect to rates and policy forms, strict regulations apply to surplus lines placements in the laws of every state and the regulation of surplus lines insurance may undergo changes in the future. Federal or state measures may be introduced to increase the oversight of surplus lines insurance in the future. 

Federal Regulation. Although the federal government and its regulatory agencies generally do not directly regulate the business of insurance, federal initiatives could have an impact on our business in a variety of ways. The Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010 (the “Dodd-Frank Act”) effected sweeping changes to financial services regulation in the United States. The Dodd-Frank Act created two new federal government bodies, the Federal Insurance Office (the “FIO”) and the Financial Stability Oversight Council (the “FSOC”), which may impact the regulation of insurance. Although the FIO has preemption authority over state insurance laws that conflict with certain international agreements, it does not have general supervisory or regulatory authority over the business of insurance. The FIO has authority to represent the United States in international insurance matters and is authorized to monitor the U.S. insurance industry and identify potential regulatory gaps that could contribute to systemic risk. In May 2018, the Economic Growth, Regulatory Relief and Consumer Protection Act (“Economic Growth Act”) was signed into law. Among other things, the Economic Growth Act addresses the roles played by federal regulators at international insurance standard-setting forums. It directs the Director of the FIO and the Board of Governors of the Federal Reserve to support increased transparency at international standard-setting regulatory forums (e.g., the IAIS). These federal regulations also instruct the FIO and the Federal Reserve to achieve consensus positions with the states through the NAIC prior to taking a position on any insurance proposal by a global insurance regulatory forum.

The Dodd-Frank Act authorizes the Secretary of the Treasury and U.S. Trade Representative to enter into international agreements of mutual recognition regarding the prudential regulation of insurance or reinsurance (a “Covered Agreement”). In January 2017, the U.S. Department of Treasury and the U.S. Trade Representative announced the completion of Covered Agreement negotiations with the European Union (“EU”).

The Covered Agreement addresses three areas of prudential supervision: reinsurance, group supervision and the exchange of information between the U.S. and EU. In September 2017, the U.S. and EU signed the Covered Agreement. Each party has begun the process of completing its internal requirements and procedures (such as amending or promulgating appropriate statutes and regulations) in order for the Covered Agreement to enter into force. Under the Covered Agreement, reinsurance collateral requirements will no longer apply to qualifying EU reinsurers that sell reinsurance to the U.S. market, and U.S. reinsurers operating in the EU market will no longer be subject to “local presence” requirements. The Covered Agreement establishes group supervision practices that apply only to U.S. and EU insurance groups operating in both territories. For

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instance, the Covered Agreement provides that U.S. insurance groups with operations in the EU will be supervised at the worldwide level only by U.S. insurance regulators, and precludes EU insurance supervisors from exercising solvency and capital requirements over the worldwide operations of U.S. insurers.

U.S. states have five years from the date of signature to remove reinsurance collateral requirements for EU reinsurers that meet certain standards (such as minimum capital and solvency ratios and claims payment standards), while EU member states have two years to revise their “local presence” laws. Under the Dodd-Frank Act, the FIO has preemption authority over state insurance laws that conflict with the Covered Agreement. Accordingly, the NAIC is working on proposed amendments to the NAIC’s Credit for Reinsurance Model Law in order to satisfy the substantive and timing requirements of the Covered Agreement. Additionally, in late December 2018, the U.S. Department of the Treasury and the Office of the U.S. Trade Representative entered into a covered agreement with the U.K., which will extend the benefits of the Covered Agreement to the U.K. after Brexit. We cannot currently predict the impact of these changes to the law or whether any other covered agreements will be successfully adopted, and cannot currently estimate the impact of these changes to the law and any such adopted covered agreements on our business, financial condition or operating results.

The FIO also can recommend to the FSOC that it designate an insurer as an entity posing risks to the United States' financial stability in the event of the insurer's material financial distress or failure, i.e., a "systemically important financial institution." An insurer so designated by FSOC will be subject to Federal Reserve supervision and heightened prudential standards. As of December 31, 2018, there are no longer any non-bank financial firms, including insurance groups, designated as systemically significant. In November 2017, the U.S. Department of Treasury issued a report recommending certain changes to FSOC’s process for designating non-bank financial companies as systemically significant in order to make the designation process more rigorous, clear and transparent. To date, the FSOC has not updated its rules to reflect these recommendations.

Based upon our current business model and balance sheet, we do not believe that we will be designated by the FSOC as such an institution. Although the potential impacts of the Dodd-Frank Act, its implementing regulations and potential amendments to the Dodd-Frank Act on the U.S. insurance industry are not clear, our business could be affected by changes to the U.S. system of insurance regulation or our designation or the designation of insurers or reinsurers with which we do business as systemically important non-bank financial companies.

International Regulation

Our insurance subsidiaries based in the United Kingdom are regulated by the Prudential Regulation Authority ("PRA") and/or the Financial Conduct Authority ("FCA"). The PRA's primary objectives with regard to insurers are to promote the safety and soundness of insurers and to contribute to the securing of an appropriate degree of protection for current and future policyholders, while the FCA has three operational objectives: (i) to secure an appropriate degree of protection for consumers, (ii) to protect and enhance the integrity of the United Kingdom financial system, and (iii) to promote effective competition in the interests of consumers in the financial services markets. The PRA and FCA employ a variety of regulatory tools to achieve their objectives, including periodic auditing and reporting requirements, risk assessment reviews, minimum solvency margins and individual capital assessment requirements, dividend restrictions, in certain cases, approval requirements governing the appointment of key officers, approval requirements governing controlling ownership interests and various other requirements. Certain of our U.K. subsidiaries are authorized by the PRA to effect and carry out contracts of insurance (which includes reinsurance) in the U.K. and are regulated by both the PRA and the FCA for prudential and conduct of business matters respectively.

Our Lloyd's managing agency is regulated by the PRA, FCA and Lloyd's, and the Lloyd's syndicate business is subject to Lloyd's supervision. Through Lloyd's, we are licensed to write business in various countries throughout the world by virtue of Lloyd's international licenses. In each such country, we are subject to the laws and insurance regulation of that country. Our insurance subsidiary based in Liechtenstein is regulated by the Financial Market Authority of Liechtenstein, which has regulatory tools analogous to those of the U.K. regulators noted above.  Additionally, U.K. and Liechtenstein laws and regulations also impact us as “controllers” of our European-regulated subsidiaries, whereby we are required to notify the appropriate authorities about significant events relating to such regulated subsidiaries' controllers (i.e. persons or entities which have certain levels of direct or indirect voting power or economic interests in the regulated entities) as well as changes of control, and to submit annual reports regarding their controllers. The PRA/FCA's Senior Managers and Certification Regime and analogous regulation in Liechtenstein further provide regulatory frameworks for standards of fitness and propriety, conduct and accountability for individuals in positions of responsibility at insurers. In addition, certain employees are individually registered at Lloyd's.

An insurance company with authorization to write insurance business in the U.K. may currently provide cross-border services in the other member states of the European Economic Area (“EEA”), a group including member states of the European Union (“EU”) in addition to Switzerland, Norway, Liechtenstein and Iceland. These rights may be restricted or modified depending on the United Kingdom’s planned withdrawal from the EU and/or EEA-See below “Risks Relating To Our Business-The United Kingdom leaving the EU could adversely affect our business” for more information.

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Our insurance business throughout the EU and EEA is subject to "Solvency II", an insurance regulatory regime governing, among other things, capital adequacy and risk management which became effective on January 1, 2016. Lloyd’s applies a  capital adequacy test to all Lloyd’s syndicates, including our syndicate, that is based on Solvency II principles. Solvency II provides for the supervision of group solvency. Under Solvency II, it is possible that the U.S. parent of a European Union subsidiary could be subject to certain Solvency II requirements if the U.S. company is not already subject to regulations deemed “equivalent” to Solvency II. Currently, the U.S. system of insurance regulation relating to group supervision is not deemed "equivalent" to Solvency II by European Union authorities. However, we have received a waiver from the PRA, subject to conditions, with respect to the PRA's supervision of our group, which waives the requirement on us to maintain a group solvency capital requirement as calculated under Solvency II rules. The Covered Agreement also prohibits any EU supervisor from exercising group-wide supervision at any level above the highest company organized in the country of that supervisor.

We must also comply with the recently enacted EU General Data Protection Regulation (“GDPR”), which took effect in May 2018. The regulation’s goal is to impose increased individual rights and protections for all personal data located in or originating from the EU. GDPR is extraterritorial in that it applies to all businesses in the EU and any business outside the EU that process EU personal data of individuals in the EU. Moreover, there are significant fines associated with non-compliance. In particular, as the European member states reframe their national legislation to prepare for and harmonize with the GDPR, we will need to monitor our compliance with all relevant member states' laws and regulations, including where permitted derogations from the GDPR are introduced. The introduction of the GDPR, and any resultant changes in EU member states’ national laws and regulations, may increase our compliance obligations and may necessitate the review and implementation of policies and processes relating to our collection and use of data, and may require us to change our business practices regarding these matters.

Our international operations are also subject to varying degrees of regulation in Mexico, Australia and Canada and in certain other countries in Europe, South America, and Southeast Asia. Generally, our subsidiaries must satisfy local regulatory requirements. While each country imposes licensing, solvency, auditing and financial reporting requirements, the type and extent of the requirements differ substantially. Key areas where country regulations may differ include: (i) the type of financial reports to be filed; (ii) a requirement to use local intermediaries; (iii) the amount of reinsurance permissible; (iv) the scope of any regulation of policy forms and rates; and (v) the type and frequency of regulatory examinations.

Competition 

The property casualty insurance and reinsurance businesses are highly competitive, with many insurance companies of various sizes, as well as other entities offering risk alternatives such as self-insured retentions or captive programs, transacting business in the United States and internationally. We compete directly with a large number of these companies. Competition in our industry is largely measured by the ability to provide insurance and services at a price and on terms that are reasonable and acceptable to the customer. Our strategy in this highly fragmented industry is to seek specialized areas or geographic regions where our operating units can gain a competitive advantage by responding quickly to changing market conditions. Our operating units establish their own pricing practices based upon a Company-wide philosophy to price products with the intent of making an underwriting profit.

Competition for the Insurance business within the United States comes from other specialty insurers, regional carriers, large national multi-line companies and reinsurers. Our specialty operating units compete with excess and surplus insurers as well as standard carriers. Other regional units compete with mutual and other regional stock companies as well as national carriers. Additionally, direct writers of property casualty insurance compete with our regional units by writing insurance through their salaried employees, generally at a lower acquisition cost than through independent agents such as those used by the Company. Our Insurance operations compete internationally with native insurance operations both large and small, which in some cases are related to government entities, as well as with branches or local subsidiaries of multinational companies.

Competition for the Reinsurance business, which is especially strong, comes from domestic and foreign reinsurers, which produce their business either on a direct basis or through the broker market. These competitors include Swiss Re, Munich Re, Berkshire Hathaway, Transatlantic Reinsurance, Partner Re and others.

In recent years, various institutional investors have increasingly sought to participate in the property and casualty insurance and reinsurance industries. Well-capitalized new entrants to the property and casualty insurance and reinsurance industries, or existing competitors that receive substantial infusions of capital, provide increasing competition, which may adversely impact our business and profitability. Further, an expanded supply of reinsurance capital may lower costs for insurers that rely on reinsurance and, as a consequence, those insurers may be able to price their products more competitively.

Employees 

As of January 31, 2019, we employed 7,448 individuals. Of this number, our subsidiaries employed 7,310 persons and the remaining persons were employed at the parent company.

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Other Information about the Company's Business

We maintain an interest in the acquisition and startup of complementary businesses and continue to evaluate possible acquisitions and new ventures on an ongoing basis. In addition, our operating units develop new coverages or enter lines of business to meet the needs of insureds.

Seasonal weather variations and other events affect the severity and frequency of losses sustained by the insurance and reinsurance operating units. Although the effect on our business of catastrophes such as tornadoes, hurricanes, hailstorms, wildfires, earthquakes and terrorist acts may be mitigated by reinsurance, they nevertheless can have a significant impact on the results of any one or more reporting periods. 

We have no customer that accounts for 10 percent or more of our consolidated revenues.

Compliance by W. R. Berkley and its subsidiaries with federal, state and local provisions that have been enacted or adopted regulating the discharge of materials into the environment, or otherwise relating to protection of the environment, has not had a material effect upon our capital expenditures, earnings or competitive position.

The Company's internet address is www.wrberkley.com. The information on our website is not incorporated by reference in this annual report on Form 10-K. The Company's annual report on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Securities Exchange Act and other reports filed by us or with respect to our securities by others are accessible free of charge through this website as soon as reasonably practicable after they have been electronically filed with or furnished to the SEC.

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ITEM 1A. RISK FACTORS

 Our businesses face significant risks. If any of the events or circumstances described as risks below occur, our businesses, results of operations and/or financial condition could be materially and adversely affected. In addition to those described below, our businesses may also be adversely affected by risks and uncertainties not currently known to us or that we currently consider immaterial.

Risks Relating to Our Industry 

Our results may fluctuate as a result of many factors, including cyclical changes in the insurance and reinsurance industry.

The results of companies in the property casualty insurance industry historically have been subject to significant fluctuations and uncertainties in demand and pricing, causing cyclical changes in the insurance and reinsurance industry. The demand for insurance is influenced primarily by general economic conditions, while the supply of insurance is often directly related to available capacity or the perceived profitability of the business. In recent years, we have faced significant competition in our business, as a result of new entrants and capital providers, as well as existing insurers seeking to gain market share. As a result, premium rates have increased at a modest pace for certain lines of business, while they have decreased in others. The adequacy of premium rates is affected mainly by the severity and frequency of claims, which are influenced by many factors, including natural disasters, regulatory measures and court decisions that define and expand the extent of coverage and the effects of economic inflation on the amount of compensation due for injuries or losses. In addition, investment rates of return have impacted rate adequacy, with interest rates remaining at or near historic lows. These factors can have a significant impact on ultimate profitability because a property casualty insurance policy is priced before its costs are known as premiums usually are determined long before claims are reported. These factors could produce results that would have a negative impact on our results of operations and financial condition.

We face significant competitive pressures in our businesses, which have pressured premium rates in certain areas and could harm our ability to maintain or increase our profitability and premium volume. 

We compete with a large number of other companies in our selected lines of business. We compete, and will continue to compete, with major U.S. and non-U.S. insurers and reinsurers, other regional companies, as well as mutual companies, specialty insurance companies, underwriting agencies and diversified financial services companies. Competitiveness in our businesses is based on many factors, including premium charges, ratings assigned by independent rating agencies, commissions paid to producers, the perceived financial strength of the company, other terms and conditions offered, services provided (including ease of doing business over the internet), speed of claims payment and reputation and experience in the lines to be written. In recent years, the insurance industry has undergone increasing consolidation, which may further increase competition.

Some of our competitors, particularly in the Reinsurance business, have greater financial and/or marketing resources than we do. These competitors within the reinsurance segment include Swiss Re, Munich Re, Berkshire Hathaway, Transatlantic Reinsurance, and Partner Re. We expect that perceived financial strength, in particular, will become more important as customers seek high quality reinsurers.

Over the past several years, increased supply has led to significant competition in our business. Our E&S operating units have also encountered competition from admitted companies seeking to increase market share. Although insurance prices have generally increased for most lines of business since 2011, the rate of increase declined in more recent years before beginning to modestly accelerate again. Loss costs have also increased over that period of time. With the low level of interest rates available, current price levels for certain lines of business remain below the prices required for us to achieve our long-term return objectives. We expect to continue to face strong competition in these and our other lines of business and, as a result, pressure on pricing and policy terms and conditions.

In recent years, various types of investors have increasingly sought to participate in the property and casualty insurance and reinsurance industries. Well-capitalized new entrants to the property and casualty insurance and reinsurance industries, or existing competitors that receive substantial infusions of capital or access to third-party capital, provide increasing competition, which may adversely impact our business and profitability. Further, an expanded supply of reinsurance capital may lower costs for insurers that rely on reinsurance and, as a consequence, those insurers may be able to price their products more competitively.  In addition, technology companies or other third parties have created, and may in the future create, technology-enabled business models, processes, platforms or alternate distribution channels that may adversely impact our competitive position.

This intense competition could cause the supply and/or demand for insurance or reinsurance to change, which affect our ability to price our products at attractive rates and retain existing business or write new products at adequate rates or on terms

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and conditions acceptable to us. If we are unable to retain existing business or write new business at adequate rates or on terms and conditions acceptable to us, our results of operations could be materially and adversely affected.

Our actual claims losses may exceed our reserves for claims, which may require us to establish additional reserves. 

Our gross reserves for losses and loss expenses were approximately $12.0 billion as of December 31, 2018. Our loss reserves reflect our best estimates of the cost of settling claims and related expenses with respect to insured events that have occurred. 

Reserves do not represent an exact calculation of liability. Rather, reserves represent an estimate of what management expects the ultimate settlement and claims administration will cost for claims that have occurred, whether known or unknown. The major assumptions about anticipated loss emergence patterns are subject to unanticipated fluctuation. These estimates, which generally involve actuarial projections, are based on management's assessment of facts and circumstances then known, as well as estimates of future trends in claims severity and frequency, inflation, judicial theories of liability, reinsurance coverage, legislative changes and other factors, including the actions of third parties, which are beyond our control. 

The inherent uncertainties of estimating reserves are greater for certain types of liabilities, where long periods of time elapse before a definitive determination of liability is made and settlement is reached. In periods with increased economic volatility, it becomes more difficult to accurately predict claim costs. It is especially difficult to estimate the impact of inflation on loss reserves given the current economic environment and related government actions. Both inflation overall and medical cost inflation, which has historically been greater than inflation overall, can have an adverse impact.

Reserve estimates are continually refined in an ongoing process as experience develops and further claims are reported and settled. Adjustments to reserves are reflected in the results of the periods in which such estimates are changed. Because setting reserves is inherently uncertain, we cannot assure that our current reserves will prove adequate in light of subsequent events. Should we need to increase our reserves, our pre-tax income for the reporting period would decrease by a corresponding amount. 

We discount our reserves for excess and assumed workers' compensation business because of the long period of time over which losses are paid. Discounting is intended to appropriately match losses and loss expenses to income earned on investment securities supporting liabilities. The expected loss and loss expense payout pattern subject to discounting is derived from our loss payout experience. Changes in the loss and loss expense payout pattern are recorded in the period they are determined. If the actual loss payout pattern is shorter than anticipated, the discount will be reduced and pre-tax income will decrease by a corresponding amount.

The effects of emerging claim and coverage issues on our business are uncertain.    

As industry practices and economic, legal, judicial, social and other environmental conditions change, unexpected and unintended issues related to claim and coverage may emerge. These issues may adversely affect our business by either extending coverage beyond our underwriting intent or by increasing the number or size of claims. Examples of emerging claims and coverage issues include, but are not limited to:

• judicial expansion of policy coverage and a greater propensity to grant claimants more favorable amounts and the impact of new theories of liability;

• plaintiffs targeting property and casualty insurers, including us, in purported class action litigation relating to claims-handling and other practices;

• social inflation trends, including higher and more frequent claims, more favorable judgments and legislated increases;

• medical developments that link health issues to particular causes, resulting in liability claims; and

• claims relating to unanticipated consequences of current or new technologies, including cyber security related risks;    and claims relating to potentially changing climate conditions; and

• increased claims due to third party funding of litigation.

In some instances, these emerging issues may not become apparent for some time after we have issued the affected insurance policies. As a result, the full extent of liability under our insurance policies may not be known until many years after the policies are issued.

In addition, the potential passage of new legislation designed to expand the right to sue, to remove limitations on recovery, to extend the statutes of limitations or otherwise to repeal or weaken tort reforms could have an adverse impact on our business.

The effects of these and other unforeseen emerging claim and coverage issues are difficult to predict and could harm our business and materially and adversely affect our results of operations.

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As a property casualty insurer, we face losses from natural and man-made catastrophes. 

Property casualty insurers are subject to claims arising out of catastrophes that may have a significant effect on their results of operations, liquidity and financial condition. Catastrophe losses have had a significant impact on our results. For example, catastrophe losses net of reinsurance recoveries were $105 million in 2018, $184 million in 2017, and $105 million in 2016. Similarly, man-made catastrophes can also have a material impact on our financial results.

Catastrophes can be caused by various events, including hurricanes, windstorms, earthquakes, tsunamis, hailstorms, explosions, severe winter weather and fires, as well as terrorist and other man-made activities, including drilling, mining and other industrial accidents, cyber events or terrorist activities. The incidence and severity of catastrophes are inherently unpredictable. The extent of losses from a catastrophe is a function of both the total amount of insured exposure in the area affected by the event and the severity of the event. Some catastrophes are restricted to small geographic areas; however, hurricanes, earthquakes, tsunamis and other disasters may produce significant damage in large, heavily populated areas. Catastrophes can cause losses in a variety of our property and casualty lines, and most of our past catastrophe-related claims have resulted from severe storms. Seasonal weather variations or the impact of climate change may affect the severity and frequency of our losses. Insurance companies are not permitted to reserve for a catastrophe until it has occurred. It is therefore possible that a catastrophic event or multiple catastrophic events could produce significant losses and have a material adverse effect on our results of operations and financial condition.

Changing climate conditions may increase the frequency and severity of catastrophic events and thereby adversely affect our financial condition and results.    

Over the past several years, changing weather patterns and climatic conditions, such as global warming, appear to have contributed to the unpredictability, frequency and severity of natural disasters and created additional uncertainty as to future trends and exposures.  There is a growing scientific consensus that global warming and other climate change are increasing the frequency and severity of catastrophic weather  events, such as hurricanes, tornadoes, windstorms, floods and other natural disasters.  Such changes make it more difficult for us to predict and model catastrophic events, reducing our ability to accurately price our exposure to such events and mitigate our risks. Any increase in the frequency or severity of natural disasters may adversely affect our financial condition and results.

We, as a primary insurer, may have significant exposure for terrorist acts. 

To the extent an act of terrorism, whether a domestic or foreign act, is certified by the Secretary of Treasury, we may be covered under the Terrorism Risk Insurance Program Reauthorization Act of 2015 (“TRIPRA”), for up to 82% of our losses for certain property/casualty lines of insurance. However, any such coverage would be subject to a mandatory deductible based on 20% of earned premium for the prior year for the covered lines of commercial property and casualty insurance. Based on our 2018 earned premiums, our aggregate deductible under TRIPRA during 2019 is approximately $969 million. TRIPRA is currently in effect through December 31, 2020. In addition, the coverage provided under TRIPRA does not apply to reinsurance that we write.  

We are subject to extensive governmental regulation, which increases our costs and could restrict the conduct of our business. 

We are subject to extensive governmental regulation and supervision in both the United States and foreign jurisdictions. Most insurance regulations are designed to protect the interests of policyholders rather than stockholders and other investors. This system of regulation, generally administered in the United States by a department of insurance in each state in which we do business, relates to, among other things:

• standards of solvency, including risk-based capital measurements;

• restrictions on the nature, quality and concentration of investments;

• requirements pertaining to certain methods of accounting;

• evaluating enterprise risk to an insurer;

• rate and form regulation pertaining to certain of our insurance businesses; 

• potential assessments for the provision of funds necessary for the settlement of covered claims under certain policies provided by impaired, insolvent or failed insurance companies; and

• involvement in the payment or adjudication of catastrophe or other claims beyond the terms of the policies.

State insurance departments conduct periodic examinations of the affairs of insurance companies and require the filing of annual and other reports relating to the financial condition of insurance companies, holding company issues and other matters. Our Insurance business internationally is also generally subject to a similar regulatory scheme in each of the jurisdictions where we conduct operations outside the United States.

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Federal financial services modernization legislation and legislative and regulatory initiatives taken or which may be taken in response to conditions in the financial markets, global insurance supervision and other factors may lead to additional federal regulation of the insurance industry in the coming years.

The Dodd-Frank Act effected sweeping changes to financial services regulation in the United States. The Dodd-Frank Act established the Financial Stability Oversight Council (“FSOC”), which is authorized to recommend that certain systemically significant non-bank financial companies, including insurance companies, be regulated by the Board of Governors of the Federal Reserve. The Dodd-Frank Act also established a Federal Insurance Office (“FIO”) which is authorized to study, monitor and report to Congress on the U.S. insurance industry and the significance of global reinsurance to the U.S. insurance market. The FIO also can recommend to the FSOC that it designate an insurer as an entity posing risks to the United States financial stability in the event of the insurer's material financial distress or failure. The potential impact of the Dodd-Frank Act, as amended by the recent Economic Growth Act, on the U.S. insurance business is not clear. Our business could be affected by changes, whether as a result of the Dodd-Frank Act or otherwise, to the U.S. system of insurance regulation or our designation or the designation of insurers or reinsurers with which we do business as systemically significant non-bank financial companies.

Although state regulation is the primary form of regulation of insurance and reinsurance in the United States, in addition to the changes brought about by the Dodd-Frank Act, Congress has considered various proposals relating to the creation of an optional federal charter and repeal of the insurance company antitrust exemption from the McCarran-Ferguson Act. We may be subject to potentially increased federal oversight as a financial institution. In addition, the current administration and the volatile political environment may increase the chance of other federal legislative and regulatory changes that could affect us in ways we cannot predict.

With respect to international measures, Solvency II, the EU regime concerning the capital adequacy, risk management and regulatory reporting for insurers and reinsurers may affect our insurance businesses. Implementation of Solvency II in EU member states occurred on January 1, 2016, and as the Solvency II regime evolves over time, we may be required to utilize a significant amount of resources to ensure compliance. In addition, despite the waiver of the Solvency II group capital requirements we received, Solvency II may have the effect of increasing the capital requirements of our EU domiciled insurers. Additionally, our capital requirements and compliance requirements may be adversely affected if the EU commission does not deem the insurance regulatory regimes of the jurisdictions outside the EU in which we have insurance or reinsurance companies domiciled to be "equivalent" to Solvency II. If our compliance with Solvency II or any other regulatory regime is challenged, we may be subject to monetary or other penalties. In addition, in order to ensure compliance with applicable regulatory requirements or as a result of any investigation, including remediation efforts, we could be required to incur significant expenses and undertake additional work, which in turn may divert resources from our business.

We may be unable to maintain all required licenses and approvals and our business may not fully comply with the wide variety of applicable laws and regulations or the relevant authority's interpretation of the laws and regulations. Also, some regulatory authorities have relatively broad discretion to grant, renew or revoke licenses and approvals. If we do not have the requisite licenses and approvals or do not comply with applicable regulatory requirements, the insurance regulatory authorities could preclude or temporarily suspend us from carrying on some or all of our activities or monetarily penalize us. Also, changes in the level of regulation of the insurance industry, whether federal, state or foreign, or changes in laws or regulations themselves or interpretations by regulatory authorities, may further restrict the conduct of our business. 

Risks Relating to Our Business

Our international operations expose us to investment, political and economic risks, including foreign currency and credit risk.

Our expanding international operations in the United Kingdom, Continental Europe, South America, Canada, Mexico, Scandinavia, the Asia-Pacific region, Africa and Australia expose us to increased investment, political and economic risks, including foreign currency and credit risk. Changes in the value of the U.S. dollar relative to other currencies could have an adverse effect on our results of operations and financial condition. 

Our investments in non-U.S.-denominated assets are subject to fluctuations in non-U.S. securities and currency markets, and those markets can be volatile. Non-U.S. currency fluctuations also affect the value of any dividends paid by our non-U.S. subsidiaries to their parent companies in the U.S.

The United Kingdom leaving the EU could adversely affect our business.

The 2016 U.K. referendum on its membership in the EU resulted in a majority of U.K. voters voting in favor of the U.K. leaving the EU (“Brexit”). On March 29, 2017, the U.K. government formally notified the European Council of the U.K.’s intention to withdraw from the EU. The member withdrawal provisions in the EU treaty provide that the U.K. and the EU will negotiate a withdrawal agreement by March 29, 2019 (unless such deadline is extended by unanimous vote of the EU member

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states). As part of the sequenced approach to the talks set out by the EU, sufficient progress needs to be made on the withdrawal arrangements before any talks on a future trade deal between the EU and the U.K. can begin. In November 2018, the U.K. and EU announced agreement on a draft text of a withdrawal agreement, which would include the application of transitional provisions under which EU law would broadly remain in force in the U.K. until the end of 2020. However, there is uncertainty as to whether the withdrawal agreement, which is subject to approval of the U.K. Parliament and has been rejected in its current form, will actually be entered. In the absence of such an agreement, there would be no transitional provisions and a "hard" Brexit would occur on March 29, 2019, unless the U.K. Government were to revoke its withdrawal notice or if the two year period to reach agreement were extended.

Depending on the terms of the withdrawal, the U.K. could lose access to the single EU market and to free trade deals with several countries that already have agreements with the EU. Such a decline in trade could affect the attractiveness of the U.K. and impact our U.K. business. We also face risks associated with the potential uncertainty and consequences related to Brexit, including with respect to volatility in financial markets, exchange rates and interest rates. These uncertainties could increase the volatility of, or reduce, our investment results in particular periods or over time.  Brexit could adversely affect European or worldwide political, regulatory, economic or market conditions and could contribute to instability in political institutions and regulatory agencies. Brexit could also lead to legal uncertainty and differing laws and regulations between the U.K. and the EU. Any of these potential effects, and others we cannot anticipate, could adversely affect our results of operations or financial condition.

We may be unable to attract and retain key personnel and qualified employees.

We depend on our ability to attract and retain key personnel, including our President and CEO, Executive Chairman, senior executive officers, presidents of our operating units, experienced underwriters and other skilled employees who are knowledgeable about our business. If the quality of our underwriting team and other personnel decreases, we may be unable to maintain our current competitive position in the specialized markets in which we operate, and be unable to expand our operations into new products and markets.

We cannot guarantee that our reinsurers will pay in a timely fashion, if at all, and, as a result, we could experience losses. 

We purchase reinsurance by transferring part of the risk that we have assumed, known as ceding, to a reinsurance company in exchange for part of the premium we receive in connection with the risk. Although reinsurance makes the reinsurer contractually liable to us to the extent the risk is transferred or ceded to the reinsurer, it does not relieve us, the reinsured, of our liability to our policyholders. Our reinsurers may not pay the reinsurance recoverables that they owe to us or they may not pay such recoverables on a timely basis. Accordingly, we bear credit risk with respect to our reinsurers, and if our reinsurers fail to pay us, our financial results would be adversely affected. Underwriting results and investment returns of some of our reinsurers may affect their future ability to pay claims. As of December 31, 2018, the amount due from our reinsurers was approximately $1,932 million, including amounts due from state funds and industry pools where it was intended that we would bear no risk. Certain of these amounts are secured by letters of credit or by funds held in trust on our behalf.

We are subject to credit risk relating to our policyholders, independent agents and brokers.

In addition to exposure to credit risk related to our reinsurance recoverables and investment portfolio, we are exposed to credit risk in several other areas of our business, including credit risk relating to policyholders, independent agents and brokers. For example our policyholders, independent agents or brokers may not pay a part of or the full amount of premiums owed to us or our brokers or other third party claim administrators may not deliver amounts owed on claims under our insurance and reinsurance contracts for which we have provided funds.

As credit risk is generally a function of the economy, we face a greater credit risk in an economic downturn. While we attempt to manage credit risks through underwriting guidelines, collateral requirements and other oversight mechanisms, our efforts may not be successful. For example, to reduce such credit risk, we require certain third parties to post collateral for some or all of their obligations to us. In cases where we receive pledged securities and the applicable counterparty is unable to honor its obligations, we may be exposed to credit risk on the securities pledged and/or the risk that our access to that collateral may be stayed as a result of bankruptcy. In cases where we receive letters of credit from banks as collateral and one of our counterparties is unable to honor its obligations, we are exposed to the credit risk of the banks that issued the letters of credit.

We are rated by A.M. Best, Standard & Poor's, and Moody's, and a decline in these ratings could affect our standing in the insurance industry and cause our sales and earnings to decrease.

Ratings have become an increasingly important factor in establishing the competitive position of insurance companies. Certain of our insurance company subsidiaries are rated by A.M. Best, Standard & Poor's and Moody's. Our ratings are subject to periodic review, and we cannot assure you that we will be able to retain our current or any future ratings.

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If our ratings are reduced from their current levels by A.M. Best, Standard & Poor's or Moody's, our competitive position in the insurance industry could suffer and it would be more difficult for us to market our products. A ratings downgrade could also adversely limit our access to capital markets, which may increase the cost of debt. A significant downgrade could result in a substantial loss of business as policyholders move to other companies with higher claims-paying and financial strength ratings.

If market conditions cause reinsurance to be more costly or unavailable, we may be required to bear increased risks or reduce the level of our underwriting commitments.

As part of our overall risk and capacity management strategy, we purchase reinsurance for certain amounts of risk underwritten by our insurance company subsidiaries, especially catastrophe risks and those risks with relatively high policy limits. We also purchase reinsurance on risks underwritten by others which we reinsure. Market conditions beyond our control determine the availability and cost of the reinsurance protection we seek to purchase, which may affect the level of our business and profitability. Our reinsurance contracts are generally subject to annual renewal, and we may be unable to maintain our current reinsurance contracts or to obtain other reinsurance contracts in adequate amounts and at favorable rates. In addition, we may be unable to obtain reinsurance on terms acceptable to us relating to certain lines of business that we intend to begin writing. If we are unable to renew our expiring contracts or to obtain new reinsurance contracts, either our net exposures would increase or, if we are unwilling to bear an increase in net exposures, we would have to reduce the level of our underwriting commitments, especially catastrophe exposed risks.

Depending on conditions in the financial markets and the general economy, we may be unable to raise debt or equity capital if needed.

If conditions in the financial markets and the general economy are unfavorable, which may result from disruptions, uncertainty or volatility in the capital and credit markets, we may be unable to access debt or equity capital on acceptable terms if needed, which could have a negative impact on our ability to invest in our insurance company subsidiaries and/or to take advantage of opportunities to expand our business, such as possible acquisitions and the creation of new ventures, and inhibit our ability to refinance our existing indebtedness if we desire to do so, on terms acceptable to us.

We may not find suitable acquisition candidates or new insurance ventures and even if we do, we may not successfully integrate any such acquired companies or successfully invest in such ventures.

As part of our present strategy, we continue to evaluate possible acquisition transactions and the start-up of complementary businesses on an ongoing basis, and at any given time we may be engaged in discussions with respect to possible acquisitions and new ventures. We cannot assure you that we will be able to identify suitable acquisition targets or insurance ventures, that such transactions will be financed and completed on acceptable terms or that our future acquisitions or start-up ventures will be successful. The process of integrating any companies we do acquire or investing in new ventures may have a material adverse effect on our results of operations and financial condition.

If we experience difficulties with our information technology, telecommunications or other computer systems, our ability to conduct our business could be negatively or severely impacted.    

Our business is highly dependent upon our employees' ability to perform necessary business functions in an efficient and uninterrupted fashion. A shut-down of, or inability to access, one or more of our facilities, a power outage or a failure of one or more of our information technology, telecommunications or other computer systems could significantly impair our employees' ability to perform such functions on a timely basis. In the event of a disaster such as a natural catastrophe, terrorist attack or industrial accident, or the infection of our systems by a malicious computer virus, our systems could be inaccessible for an extended period of time. In addition, because our information technology and telecommunications systems interface with and depend on third-party systems, we could experience service denials or failures of controls if demand for our service exceeds capacity or a third-party system fails or experiences an interruption. If our business continuity plans or system security does not sufficiently address such a business interruption, system failure or service denial, our ability to write and process new and renewal business, provide customer service, pay claims in a timely manner or perform other necessary business functions could be significantly impaired and our business could be harmed.

Failure to maintain the security of our networks and confidential data may expose us to liability.

Our operations rely on the secure processing, storage and transmission of confidential and other information in our computer systems and networks. Computer viruses, hackers, employee misconduct and other external hazards could expose our data systems to security breaches. Our electronic transmission of personal, confidential and proprietary information to third parties with whom we have business relationships and our outsourcing of certain technology and business process functions to third parties may expose us to enhanced risk related to data security. While we attempt to develop secure data transmission capabilities with these third-party vendors and others with whom we do business, our vendors and third parties could still suffer data breaches that could result in the exposure of sensitive data and the infiltration of our computer systems. Our failure to protect sensitive personal and our proprietary information, whether owing to breaches of our own systems or those of our

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vendors, could result in significant monetary and reputational damages. These increased risks, and expanding regulatory requirements regarding data security, could expose us to data loss, monetary and reputational damages and significant increases in compliance costs. As a result, our ability to conduct our business could be materially and adversely affected.

We could be adversely affected if our controls to ensure compliance with guidelines, policies and legal and regulatory standards are not effective.    

Our business is highly dependent on our ability to engage on a daily basis in a large number of insurance underwriting, claim processing and investment activities, many of which are highly complex. These activities often are subject to internal guidelines and policies, as well as legal and regulatory standards, including those related to privacy, anti-corruption, anti-bribery and global finance and insurance matters. Our continued expansion into new international markets has brought about additional requirements. A control system, no matter how well designed and operated, can provide only reasonable assurance that the control system's objectives will be met. If our controls are not effective, it could lead to financial loss, unanticipated risk exposure (including underwriting, credit and investment risk) or damage to our reputation.

We could be adversely affected by recent and future changes in U.S. Federal income tax laws.

Tax legislation commonly referred to as the Tax Cuts and Jobs Act, which was signed into law on December 22, 2017, fundamentally overhauled the U.S. tax system by, among other things, reducing the U.S. corporate income tax rate to 21%, repealing the corporate alternative minimum tax, limiting the deductibility of business interest expense, introducing a base erosion and anti-avoidance tax aimed at cross-border deductible payments to related foreign persons, moving closer to a territorial system of taxing earnings generated through foreign subsidiaries and imposing a one-time deemed repatriation tax on certain post-1986 undistributed earnings of foreign subsidiaries. In the context of the taxation of U.S. property/casualty insurance companies such as the Company, the Act also modifies the loss reserve discounting rules and the proration rules that apply to reduce reserve deductions to reflect the lower corporate income tax rate. Although we believe that the changes introduced by the Act should generally benefit us, we are unable to predict the ultimate impact of the Act and its implementing regulations. In addition, it is possible that other legislation could be introduced and enacted by the current Congress or future Congresses that could have an adverse impact on us. New regulations or pronouncements interpreting or clarifying provisions of the Act may be forthcoming. We cannot predict if, when or in what form such regulations or pronouncements may be provided, whether such guidance will have a retroactive effect or their potential impact on us.

Risks Relating to Our Investments 

A significant amount of our assets is invested in fixed maturity securities and is subject to market fluctuations. 

Our investment portfolio consists substantially of fixed maturity securities. As of December 31, 2018, our investment in fixed maturity securities was approximately $13.6 billion, or 73.5% of our total investment portfolio, including cash and cash equivalents. As of that date, our portfolio of fixed maturity securities consisted of the following types of securities: U.S. Government securities (5.2%); state and municipal securities (28.9%); corporate securities (30.3%); asset-backed securities (17.9%); mortgage-backed securities (11.8%) and foreign government (5.9%). 

The fair value of these assets and the investment income from these assets fluctuate depending on general economic and market conditions. The fair value of fixed maturity securities generally decreases as interest rates rise. If significant inflation or an increase in interest rates were to occur, the fair value of our fixed maturity securities would be negatively impacted. Conversely, if interest rates decline, investment income earned from future investments in fixed maturity securities will be lower. Some fixed maturity securities, such as mortgage-backed and other asset-backed securities, also carry prepayment risk as a result of interest rate fluctuations. Additionally, given the low interest rate environment, we may not be able to successfully reinvest the proceeds from maturing securities at yields commensurate with our target performance goals.

The value of investments in fixed maturity securities is subject to impairment as a result of deterioration in the credit worthiness of the issuer, default by the issuer (including states and municipalities) in the performance of its obligations in respect of the securities and/or increases in market interest rates. To a large degree, the credit risk we face is a function of the economy; accordingly, we face a greater risk in an economic downturn or recession. During periods of market disruption, it may be difficult to value certain of our securities, particularly if trading becomes less frequent and/or market data becomes less observable. There may be certain asset classes that were in active markets with significant observable data that become illiquid due to the current financial environment. In such cases, more securities may require additional subjectivity and management judgment.

Although the historical rates of default on state and municipal securities have been relatively low, our state and municipal fixed maturity securities could be subject to a higher risk of default or impairment due to declining municipal tax bases and revenue. Many states and municipalities operate under deficits or projected deficits, the severity and duration of which could have an adverse impact on both the valuation of our state and municipal fixed maturity securities and the issuer's

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ability to perform its obligations thereunder. Additionally, our investments are subject to losses as a result of a general decrease in commercial and economic activity for an industry sector in which we invest, as well as risks inherent in particular securities.

Although we attempt to manage these risks through the use of investment guidelines and other oversight mechanisms and by diversifying our portfolio and emphasizing preservation of principal, our efforts may not be successful. Impairments, defaults and/or rate increases could reduce our net investment income and net realized investment gains or result in investment losses. Investment returns are currently, and will likely continue to remain, under pressure due to the continued low inflation, actions by the Federal Reserve, economic uncertainty, more generally, and the shape of the yield curve. As a result, our exposure to the risks described above could materially and adversely affect our results of operations, liquidity and financial condition.

We have invested a portion of our assets in equity securities, merger arbitrage securities, investment funds, private equity, loans and real estate related assets, which are subject to significant volatility and may decline in value.

We invest a portion of our investment portfolio in equity securities, merger arbitrage securities, investment funds, private equity, loans and real estate related assets. At December 31, 2018, our investment in these assets was approximately $4.1 billion, or 22.1%, of our investment portfolio, including cash and cash equivalents.

Merger and arbitrage trading securities were $452.6 million, or 2.4% of our investment portfolio, including cash and cash equivalents at December 31, 2018. Merger arbitrage involves investing in the securities of publicly held companies that are the targets in announced tender offers and mergers. Merger arbitrage differs from other types of investments in its focus on transactions and events believed likely to bring about a change in value over a relatively short time period, usually four months or less. Our merger arbitrage positions are exposed to the risk associated with the completion of announced deals, which are subject to regulatory as well as political and other risks.

Real estate related investments, including directly owned, investment funds and loans receivable, were $2.7 billion, or 14.4% of our investment portfolio, including cash and cash equivalents, at December 31, 2018. We also invest in aviation and rail equipment funds, credit-related funds and energy and other investment funds. The values of these investments are subject to fluctuations based on changes in the economy and interest rates in general and the related asset valuations in particular. In addition, our investments in real estate related assets and other alternative investments are less liquid than our other investments.

These investments are subject to significant volatility as a result of the conditions in the financial and commodity markets and the global economy.

Risks Relating to Purchasing Our Securities

We are an insurance holding company and, therefore, may not be able to receive dividends in needed amounts.

As an insurance holding company, our principal assets are the shares of capital stock of our insurance company subsidiaries. We have to rely on dividends from our insurance company subsidiaries to meet our obligations for paying principal and interest on outstanding debt obligations, paying dividends to stockholders and repurchasing our shares and paying corporate expenses. The payment of dividends by our insurance company subsidiaries is subject to regulatory restrictions and will depend on the surplus and future earnings of these subsidiaries. During 2019, the maximum amount of dividends that can be paid without regulatory approval is approximately $1.1 billion. As a result, in the future we may not be able to receive dividends from these subsidiaries at times and in amounts necessary to meet our obligations, pay dividends or repurchase shares.

Laws and regulations of the jurisdictions in which we conduct business could delay, deter or prevent an attempt to acquire control of us that stockholders might consider to be desirable, and may restrict a stockholder's ability to purchase our common stock.

Generally, United States insurance holding company laws require that, before a person can acquire control of an insurance company, prior written approval must be obtained from the insurance regulatory authorities in the state in which that insurance company is domiciled. Pursuant to applicable laws and regulations, “control” over an insurer is generally presumed to exist if any person, directly or indirectly, owns, controls, holds the power to vote, or holds proxies representing 10% or more of the voting securities of that insurer or any parent company of such insurer. Indirect ownership includes ownership of the shares of our common stock. Thus, the insurance regulatory authorities of the states in which our insurance subsidiaries are domiciled are likely to apply these restrictions on acquisition of control to any proposed acquisition of our common stock. Some states require a person seeking to acquire control of an insurer licensed but not domiciled in that state to make a filing prior to completing an acquisition if the acquirer and its affiliates, on the one hand, and the target insurer and its affiliates, on the other hand, have specified market shares in the same lines of insurance in that state. Additionally, many foreign jurisdictions where we conduct business impose similar restrictions and requirements.

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These provisions can also lead to the imposition of conditions on an acquisition that could delay or prevent its consummation. These laws may discourage potential acquisition proposals and may delay, deter or prevent a change in control of us through transactions, and in particular unsolicited transactions, that some or all of our stockholders might consider to be desirable. 

Certain provisions in our organizational documents may have the effect of hindering, delaying or preventing third party takeovers and thus may prevent our stockholders from receiving premium prices for their shares in an unsolicited takeover or make it more difficult for third parties to replace our current management.

Provisions of our Restated Certificate of Incorporation and By-Laws, as well as state insurance statutes, may hinder, delay or prevent unsolicited acquisitions or changes of our control. These provisions may also have the effect of making it more difficult for third parties to cause the replacement of our current management without the concurrence of our board of directors. 

These provisions include:

• our classified board of directors and the ability of our board to increase its size and to appoint directors to fill newly created directorships;

• the requirement that 80% of our stockholders must approve mergers and other transactions between us and the holder of 5% or more of our shares, unless the transaction was approved by our board of directors prior to such holder's acquisition of 5% of our shares; and

• the need for advance notice in order to raise business or make nominations at stockholders' meetings.

These provisions may discourage potential acquisition proposals and may delay, deter or prevent a change in control of us through transactions, and in particular unsolicited transactions, that some or all of our stockholders might consider to be desirable.

ITEM 1B. UNRESOLVED STAFF COMMENTS

There are no unresolved written comments that were received from the SEC staff 180 days or more before the end of our fiscal year relating to our periodic or current reports under the Securities Exchange Act of 1934.

ITEM 2. PROPERTIES

W. R. Berkley and its subsidiaries own or lease office buildings or office space suitable to conduct their operations. At December 31, 2018, the Company had aggregate office space of 4,074,969 square feet, of which 1,153,563 were owned and 2,921,406 were leased.

Rental expense for the Company's operations was approximately $45,778,000, $52,925,000 and $47,453,000 for 2018, 2017 and 2016, respectively. Future minimum lease payments, without provision for sublease income, are $46,592,000 in 2019, $43,504,000 in 2020 and $180,126,000 thereafter.

ITEM 3. LEGAL PROCEEDINGS

The Company's subsidiaries are subject to disputes, including litigation and arbitration, arising in the ordinary course of their insurance and reinsurance businesses. The Company's estimates of the costs of settling such matters are reflected in its aggregate reserves for losses and loss expenses, and the Company does not believe that the ultimate outcome of such matters will have a material adverse effect on its financial condition or results of operations.

ITEM 4. MINE SAFETY DISCLOSURES

Not applicable.

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PART II

ITEM 5. MARKET FOR THE REGISTRANT'S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES

The common stock of the Company is traded on the New York Stock Exchange under the symbol “WRB”.

In 2018, the Board declared regular quarterly cash dividends of $0.14 per share in first quarter, and $0.15 per share in each of the remaining three quarters, plus three additional special dividends of $0.50 per share each. Subject to availability, the Board currently expects to continue such regular quarterly cash dividends.

The approximate number of record holders of the common stock on February 19, 2019 was 323.

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The chart below shows a comparison of 5 year cumulative total return.

Comparison of 5 Year Cumulative Total Return

Assumes initial investment of $100 on January 1, 2014, with dividends reinvested.

The S&P 500® Property and Casualty Insurance Index consists of Allstate Corporation, Chubb, Ltd., Cincinnati Financial Corporation, Progressive Corporation, and The Travelers Companies, Inc.

		2013	2014	2015	2016	2017	2018
W. R. Berkley Corporation	Cum $	100.00	121.61	131.05	163.48	180.12	188.43
S&P 500 Index - Total Returns	Cum $	100.00	113.69	115.26	129.05	157.22	150.32
S&P 500 Property and Casualty Insurance Index	Cum $	100.00	115.74	126.77	146.68	179.52	171.10

Set forth below is a summary of the shares repurchased by the Company during the fourth quarter of 2018 and the remaining number of shares authorized for purchase by the Company during such period.

	Total Number of Shares Purchased	Average Price Paid per Share	Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs	Maximum Number of Shares that may yet be Purchased Under the Plans or Programs
October 2018	—	—	—	9,167,997
November 2018	—	—	—	9,167,997
December 2018	256,600	69.96	256,600	8,911,397

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ITEM 6. SELECTED FINANCIAL DATA

	Year Ended December 31,
(In thousands, except per share data)	2018			2017			2016			2015			2014
Net premiums written	$	6,433,227		$	6,260,508		$	6,423,913		$	6,189,515		$	5,996,947
Net premiums earned	6,371,505			6,311,419			6,293,348			6,040,609			5,744,418
Net investment income	674,235			575,788			564,163			512,645			600,885
Net realized and unrealized gains on investments	154,488			335,858			267,005			92,324			254,852
Revenues from non-insurance businesses	372,985			326,165			390,348			421,102			410,022
Insurance service fees	117,757			134,729			138,944			139,440			117,443
Total revenues	7,691,651			7,684,764			7,654,184			7,206,457			7,128,928
Interest expense	157,185			147,297			140,896			130,946			128,174
Income before income taxes	812,094			772,770			896,438			732,030			952,196
Income tax expense	(163,028		)	(219,433		)	(292,953		)	(227,923		)	(302,593		)
Noncontrolling interests	(8,317		)	(4,243		)	(1,569		)	(413		)	(719		)
Net income to common stockholders	640,749			549,094			601,916			503,694			648,884
Data per common share:
Net income per basic share	5.06			4.40			4.91			4.06			5.07
Net income per diluted share	5.00			4.26			4.68			3.87			4.86
Common stockholders’ equity	44.57			44.53			41.65			37.31			36.21
Cash dividends declared	2.09			1.55			1.51			0.47			1.43
Weighted average shares outstanding:
Basic	126,699			124,843			122,651			124,040			127,874
Diluted	128,264			129,018			128,553			130,189			133,652
Investments	$	17,723,089		$	17,450,508		$	16,649,792		$	15,351,467		$	15,591,824
Total assets	24,895,977			24,299,917			23,364,844			21,730,967			21,716,691
Reserves for losses and loss expenses	11,966,448			11,670,408			11,197,195			10,669,150			10,369,701
Senior notes and other debt	1,882,028			1,769,052			1,760,595			1,844,621			2,115,527
Subordinated debentures	907,491			728,218			727,630			340,320			340,060
Common stockholders’ equity	5,437,851			5,411,344			5,047,208			4,600,246			4,589,945

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ITEM 7. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Overview

W. R. Berkley Corporation is an insurance holding company that is among the largest commercial lines writers in the United States and operates worldwide in two business segments of the property and casualty business: Insurance and Reinsurance. Our decentralized structure provides us with the flexibility to respond quickly and efficiently to local or specific market conditions and to pursue specialty business niches. It also allows us to be closer to our customers in order to better understand their individual needs and risk characteristics. While providing our business units with certain operating autonomy, our structure allows us to capitalize on the benefits of economies of scale through centralized capital, investment, reinsurance and enterprise risk management, and actuarial, financial and corporate legal staff support. The Company's primary sources of revenues and earnings are its insurance operations and its investments.

An important part of our strategy is to form new operating units to capitalize on various business opportunities. Over the years, the Company has formed numerous new operating units that are focused on important parts of the economy in the U.S., including healthcare, cyber security, energy and agriculture, and on growing international markets, including the Asia-Pacific region, South America and Mexico.

The profitability of the Company’s insurance business is affected primarily by the adequacy of premium rates. The ultimate adequacy of premium rates is not known with certainty at the time an insurance policy is issued because premiums are determined before claims are reported. The ultimate adequacy of premium rates is affected mainly by the severity and frequency of claims, which are influenced by many factors, including natural and other disasters, regulatory measures and court decisions that define and change the extent of coverage and the effects of economic inflation on the amount of compensation for injuries or losses. General insurance prices are also influenced by available insurance capacity, i.e., the level of capital employed in the industry, and the industry’s willingness to deploy that capital.

The Company’s profitability is also affected by its investment income and investment gains. The Company’s invested assets are invested principally in fixed maturity securities. The return on fixed maturity securities is affected primarily by general interest rates, as well as the credit quality and duration of the securities. Returns available on fixed maturity investments have been at low levels for an extended period, although recently interest rates have increased.

The Company also invests in equity securities, merger arbitrage securities, investment funds (including energy related funds), private equity, loans and real estate related assets. The Company's investments in investment funds and its other alternative investments have experienced, and the Company expects to continue to experience, greater fluctuations in investment income.

Through the second quarter of 2018, the Company used the Argentine peso (“ARS”) as its functional currency for its business in Argentina and translated the financial statements of its Argentine operations into U.S. dollars ("USD"). Exchange rate movements through the second quarter of 2018 between the ARS and USD had been recorded as a currency translation gain or loss, which is a component of AOCI. Based on recent ARS inflation rate movements, the Company concluded that, effective July 1, 2018, the Argentine economy is considered highly inflationary under GAAP. This conclusion required the Company to change the functional currency of its Argentine operations to USD commencing July 1, 2018, and accordingly, the Company recognized foreign exchange gains and losses in earnings for any transactions in the Argentine operations that are not USD denominated.

Effective January 1, 2018, the Company adopted new accounting standards including ASU 2014-09, Revenue from Customers, ASU 2016-01, Financial Instruments and ASU 2018-02, Reporting Comprehensive Income. Refer to Note 1 in the financial statements for further information on the accounting guidance and impact of its adoption on the Company's results and financial position.

On February 21, 2019, the Company announced that its Board of Directors approved a 3-for-2 common stock split to be paid in the form of a stock dividend to holders of record on March 14, 2019. The additional shares are expected to be issued on April 2, 2019.

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Critical Accounting Estimates

The following presents a discussion of accounting policies and estimates relating to reserves for losses and loss expenses, assumed premiums and other-than-temporary impairments of investments. Management believes these policies and estimates are the most critical to its operations and require the most difficult, subjective and complex judgments.

Reserves for Losses and Loss Expenses. To recognize liabilities for unpaid losses, either known or unknown, insurers establish reserves, which is a balance sheet account representing estimates of future amounts needed to pay claims and related expenses with respect to insured events which have occurred. Estimates and assumptions relating to reserves for losses and loss expenses are based on complex and subjective judgments, often including the interplay of specific uncertainties with related accounting and actuarial measurements. Such estimates are also susceptible to change as significant periods of time may elapse between the occurrence of an insured loss, the report of the loss to the insurer, the ultimate determination of the cost of the loss and the insurer’s payment of that loss.

In general, when a claim is reported, claims personnel establish a “case reserve” for the estimated amount of the ultimate payment based upon known information about the claim at that time. The estimate represents an informed judgment based on general reserving practices and reflects the experience and knowledge of the claims personnel regarding the nature and value of the specific type of claim. Reserves are also established on an aggregate basis to provide for losses incurred but not reported (“IBNR”) to the insurer, potential inadequacy of case reserves and the estimated expenses of settling claims, including legal and other fees and general expenses of administrating the claims adjustment process. Reserves are established based upon the then current legal interpretation of coverage provided.

In examining reserve adequacy, several factors are considered in estimating the ultimate economic value of losses. These factors include, among other things, historical data, legal developments, changes in social attitudes and economic conditions, including the effects of inflation. The actuarial process relies on the basic assumption that past experience, adjusted judgmentally for the effects of current developments and anticipated trends, is an appropriate basis for predicting future outcomes. Reserve amounts are based on management’s informed estimates and judgments using currently available data. As additional experience and other data become available and are reviewed, these estimates and judgments may be revised. This may result in reserve increases or decreases that would be reflected in our results in periods in which such estimates and assumptions are changed.

Reserves do not represent a certain calculation of liability. Rather, reserves represent an estimate of what management expects the ultimate settlement and claim administration will cost. While the methods for establishing reserves are well tested over time, the major assumptions about anticipated loss emergence patterns are subject to uncertainty. These estimates, which generally involve actuarial projections, are based on management’s assessment of facts and circumstances then known, as well as estimates of trends in claims severity and frequency, judicial theories of liability and other factors, including the actions of third parties which are beyond the Company’s control. These variables are affected by external and internal events, such as inflation and economic volatility, judicial and litigation trends, reinsurance coverage, legislative changes and claim handling and reserving practices, which make it more difficult to accurately predict claim costs. The inherent uncertainties of estimating reserves are greater for certain types of liabilities where long periods of time elapse before a definitive determination of liability is made. Because setting reserves is inherently uncertain, the Company cannot provide assurance that its current reserves will prove adequate in light of subsequent events.

Loss reserves included in the Company’s financial statements represent management’s best estimates based upon an actuarially derived point estimate and other considerations. The Company uses a variety of actuarial techniques and methods to derive an actuarial point estimate for each operating unit. These methods include paid loss development, incurred loss development, paid and incurred Bornhuetter-Ferguson methods and frequency and severity methods. In circumstances where one actuarial method is considered more credible than the others, that method is used to set the point estimate. For example, the paid loss and incurred loss development methods rely on historical paid and incurred loss data. For new lines of business, where there is insufficient history of paid and incurred claims data, or in circumstances where there have been significant changes in claim practices, the paid and incurred loss development methods would be less credible than other actuarial methods. The actuarial point estimate may also be based on a judgmental weighting of estimates produced from each of the methods considered. Industry loss experience is used to supplement the Company’s own data in selecting “tail factors” and in areas where the Company’s own data is limited. The actuarial data is analyzed by line of business, coverage and accident or policy year, as appropriate, for each operating unit.

The establishment of the actuarially derived loss reserve point estimate also includes consideration of qualitative factors that may affect the ultimate losses. These qualitative considerations include, among others, the impact of re-underwriting initiatives, changes in the mix of business, changes in distribution sources and changes in policy terms and conditions. Examples of changes in terms and conditions that can have a significant impact on reserve levels are the use of aggregate policy limits, the expansion of coverage exclusions, whether or not defense costs are within policy limits, and changes in deductibles and attachment points.

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The key assumptions used to arrive at the best estimate of loss reserves are the expected loss ratios, rate of loss cost inflation, and reported and paid loss emergence patterns. Expected loss ratios represent management’s expectation of losses at the time the business is priced and written, before any actual claims experience has emerged. This expectation is a significant determinant of the estimate of loss reserves for recently written business where there is little paid or incurred loss data to consider. Expected loss ratios are generally derived from historical loss ratios adjusted for the impact of rate changes, loss cost trends and known changes in the type of risks underwritten. Expected loss ratios are estimated for each key line of business within each operating unit. Expected loss cost inflation is particularly important for the long-tail lines, such as excess casualty, and claims with a high medical component, such as workers’ compensation. Reported and paid loss emergence patterns are used to project current reported or paid loss amounts to their ultimate settlement value. Loss development factors are based on the historical emergence patterns of paid and incurred losses, and are derived from the Company’s own experience and industry data. The paid loss emergence pattern is also significant to excess and assumed workers’ compensation reserves because those reserves are discounted to their estimated present value based upon such estimated payout patterns. Management believes the estimates and assumptions it makes in the reserving process provide the best estimate of the ultimate cost of settling claims and related expenses with respect to insured events which have occurred; however, different assumptions and variables could lead to significantly different reserve estimates.

Loss frequency and severity are measures of loss activity that are considered in determining the key assumptions described in our discussion of loss and loss expense reserves, including expected loss ratios, rate of loss cost inflation and reported and paid loss emergence patterns. Loss frequency is a measure of the number of claims per unit of insured exposure, and loss severity is a measure of the average size of claims. Factors affecting loss frequency include the effectiveness of loss controls and safety programs and changes in economic activity or weather patterns. Factors affecting loss severity include changes in policy limits, retentions, rate of inflation and judicial interpretations.

Another factor affecting estimates of loss frequency and severity is the loss reporting lag, which is the period of time between the occurrence of a loss and the date the loss is reported to the Company. The length of the loss reporting lag affects our ability to accurately predict loss frequency (loss frequencies are more predictable for lines with short reporting lags) as well as the amount of reserves needed for incurred but not reported losses (less IBNR is required for lines with short reporting lags). As a result, loss reserves for lines with short reporting lags are likely to have less variation from initial loss estimates. For lines with short reporting lags, which include commercial automobile, primary workers’ compensation, other liability (claims-made) and property business, the key assumption is the loss emergence pattern used to project ultimate loss estimates from known losses paid or reported to date. For lines of business with long reporting lags, which include other liability (occurrence), products liability, excess workers’ compensation and liability reinsurance, the key assumption is the expected loss ratio since there is often little paid or incurred loss data to consider. Historically, the Company has experienced less variation from its initial loss estimates for lines of businesses with short reporting lags than for lines of business with long reporting lags.

The key assumptions used in calculating the most recent estimate of the loss reserves are reviewed each quarter and adjusted, to the extent necessary, to reflect the latest reported loss data, current trends and other factors observed. If the actual level of loss frequency and severity are higher or lower than expected, the ultimate losses will be different than management’s estimate. The following table reflects the impact of changes (which could be favorable or unfavorable) in frequency and severity, relative to our assumptions, on our loss estimate for claims occurring in 2018:

(In thousands)	Frequency (+/-)
Severity (+/-)	1%		5%		10%
1%	$	78,922	$	237,553	$	435,840
5%	237,553		402,465		608,606
10%	435,840		608,606		824,563

Our net reserves for losses and loss expenses of approximately $10.2 billion as of December 31, 2018 relate to multiple accident years. Therefore, the impact of changes in frequency or severity for more than one accident year could be higher or lower than the amounts reflected above. The impact of such changes would likely be manifested gradually over the course of many years, as the magnitude of the changes became evident.

Approximately $1.6 billion, or 15%, of the Company’s net loss reserves as of December 31, 2018 relate to the Reinsurance segment. There is a higher degree of uncertainty and greater variability regarding estimates of assumed loss reserves because those estimates are based, in part, upon information received from ceding companies. If information received from ceding companies is not timely or correct, the Company’s estimate of ultimate losses may not be accurate. Furthermore, due to delayed reporting of claim information by ceding companies, the claim settlement tail for assumed reinsurance is extended. Management considers the impact of delayed reporting in its selection of assumed loss development factors.

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Information received from ceding companies is used to set initial expected loss ratios, to establish case reserves and to estimate reserves for incurred but not reported losses on assumed reinsurance business. This information, which is generally provided through reinsurance intermediaries, is gathered through the underwriting process and from periodic claim reports and other correspondence with ceding companies. The Company performs underwriting and claim audits of selected ceding companies to determine the accuracy and completeness of information provided to the Company. The information received from the ceding companies is supplemented by the Company’s own loss development experience with similar lines of business as well as industry loss trends and loss development benchmarks.

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Following is a summary of the Company’s reserves for losses and loss expenses by business segment as of December 31, 2018 and 2017:

 

(In thousands)	2018		2017
Insurance	$	8,675,042	$	8,341,622
Reinsurance	1,573,841		1,715,292
Net reserves for losses and loss expenses	10,248,883		10,056,914
Ceded reserves for losses and loss expenses	1,717,565		1,613,494
Gross reserves for losses and loss expenses	$	11,966,448	$	11,670,408

Following is a summary of the Company’s net reserves for losses and loss expenses by major line of business as of December 31, 2018 and 2017:

 

(In thousands)	Reported Case Reserves		Incurred But Not Reported		Total
December 31, 2018
Other liability	$	1,307,068	$	2,359,978	$	3,667,046
Workers’ compensation (1)	1,570,200		1,262,627		2,832,827
Professional liability	306,018		659,595		965,613
Commercial automobile	365,253		290,218		655,471
Short-tail lines (2)	294,122		259,963		554,085
Total Insurance	3,842,661		4,832,381		8,675,042
Reinsurance (1)	872,068		701,773		1,573,841
Total	$	4,714,729	$	5,534,154	$	10,248,883
December 31, 2017
Other liability	$	1,261,957	$	2,189,596	$	3,451,553
Workers’ compensation (1)	1,543,379		1,242,501		2,785,880
Professional liability	295,269		618,107		913,376
Commercial automobile	364,900		269,942		634,842
Short-tail lines (2)	297,777		258,194		555,971
Total Insurance	3,763,282		4,578,340		8,341,622
Reinsurance (1)	919,497		795,795		1,715,292
Total	$	4,682,779	$	5,374,135	$	10,056,914

____________________

(1) Reserves for excess and assumed workers’ compensation business are net of an aggregate net discount of $563 million and $591 million as of December 31, 2018 and 2017, respectively.

(2) Short-tail lines include commercial multi-peril (non-liability), inland marine, accident and health, fidelity and surety, boiler and machinery and other lines.

The Company evaluates reserves for losses and loss expenses on a quarterly basis. Changes in estimates of prior year losses are reported when such changes are made. The changes in prior year loss reserve estimates are generally the result of ongoing analysis of recent loss development trends. Original estimates are increased or decreased as additional information becomes known regarding individual claims and aggregate claim trends.

Certain of the Company's insurance and reinsurance contracts are retrospectively rated, whereby the Company collects more or less premiums based on the level of loss activity. For those contracts, changes in loss and loss expenses for prior years may be fully or partially offset by additional or return premiums.

Net prior year development (i.e, the sum of prior year reserve changes and prior year earned premiums changes) for each of the last three years ended December 31, are as follows:

(In thousands)	2018			2017		2016
(Increase) decrease in prior year loss reserves	$	(6,831	)	$	5,165	$	29,904
Increase in prior year earned premiums	45,638			32,162		29,000
Net favorable prior year development	$	38,807		$	37,327	$	58,904

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Favorable prior year development (net of additional and return premiums) was $39 million in 2018.

Insurance - Reserves for the Insurance segment developed favorably by $43 million in 2018. The favorable development was primarily attributable to workers' compensation business, partially offset by unfavorable development for professional liability business.

For workers' compensation, the favorable development was spread across many accident years, including prior to 2009, but was most significant in accident years 2015 through 2017. The favorable workers' compensation development reflects a continuation during 2018 of the benign loss cost trends experienced during recent years, particularly the favorable claim frequency trends (i.e., number of reported claims per unit of exposure). The long term trend of declining workers' compensation frequency can be attributable to improved workplace safety. Loss severity trends were also aided by our continued investment in claims handling initiatives such as medical case management services and vendor savings through usage of preferred provider networks. Reported workers' compensation losses in 2018 continued to be better than our expectations at most of our operating units, and were below the assumptions underlying our previous reserve estimates.

For professional liability business, adverse development was primarily related to unexpected large directors and officers (“D&O”) liability losses at one of our U.S. operating units, as well as lawyers professional liability losses at another operating unit. The adverse development stemmed primarily from accident years 2015 and 2016, and was driven by a higher frequency of large losses than we had experienced in previous years.

Reinsurance - Reserves for the Reinsurance segment developed unfavorably by $4 million in 2018. The unfavorable development was primarily due to U.S. casualty facultative business from accident years 2009 and prior related to construction projects, and was largely offset by favorable development on assumed excess of loss workers' compensation business.

Favorable prior year development (net of additional and return premiums) was $37 million in 2017.

Insurance - Reserves for the Insurance segment developed favorably by $68 million in 2017. The favorable development was primarily attributable to workers' compensation business, and was partially offset by unfavorable development for professional liability business.

For workers' compensation, the favorable development was related to both primary and excess business and was spread across many accident years, including those prior to 2008, but was most significant in accident years 2014 through 2016. The favorable workers' compensation development reflects a continuation during 2017 of the generally benign loss cost trends experienced in recent years, particularly the favorable claim frequency trends (i.e. number of reported claims per unit of exposure). Reported workers' compensation losses in 2017 continued to be better than our expectations at most of our operating units, and were below the assumptions underlying our previous reserve estimates. The favorable severity trends were also impacted by our continued investment in medical case management services and the higher usage of preferred provider networks. The long term trend of declining workers' compensation frequency can be attributed to improved workplace safety.

For professional liability business, adverse development was primarily related to unexpected large D&O liability losses at one of our U.S. operating units, and large professional indemnity and D&O losses in the U.K. The adverse development stemmed mainly from accident years 2013 through 2016 in the U.S. and 2011 through 2016 in the U.K.

Reinsurance - Reserves for the Reinsurance segment developed unfavorably by $31 million in 2017. This adverse development was due to reserve strengthening associated with claims impacted by the change in the Ogden discount rate in the U.K., as well as adverse development on the U.S. facultative casualty excess of loss business. The Ogden rate is the discount rate used to calculate lump-sum bodily injury payouts in the U.K., and was reduced by the U.K. Ministry of Justice from +2.5% to -0.75% in 2017; the adverse development mostly related to U.K. motor bodily injury claims which we reinsured on an excess of loss basis in accident years 2012 through 2016. The adverse development on U.S. facultative casualty business was due to construction related risks in accident years 2008 and prior.

Favorable prior year development (net of additional and return premiums) was $59 million in 2016.

Insurance - Reserves for the Insurance segment developed favorably by $53 million in 2016. The favorable development was primarily related to workers' compensation business, and was partially offset by unfavorable development for medical professional liability business.

For workers' compensation, the favorable development was related to both primary and excess business and to many accident years, including those prior to 2007. During 2016, reported workers' compensation losses continued to be better than our expectations at most of our operating units. Loss frequency and severity trends continued to be better than the assumptions underlying our previous reserve estimates. Loss severity trends also benefited from our continued investment in medical case management services and from our preferred provider networks. The long term trend of declining workers' compensation frequency can be attributed to improved workplace safety.

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For medical professional liability business, unfavorable development was primarily related to a class of business that has been discontinued. The adverse development for that business stemmed mainly from accident years 2010 through 2015.

Reinsurance - Reserves for the Reinsurance segment developed favorably by $6 million in 2016. The favorable development was primarily related to direct facultative reinsurance business and to accident years 2008 through 2014.

Reserve Discount. The Company discounts its liabilities for certain workers’ compensation reserves. The amount of workers’ compensation reserves that were discounted was $1,793 million and $1,855 million at December 31, 2018 and December 31, 2017, respectively. The aggregate net discount for those reserves, after reflecting the effects of ceded reinsurance, was $563 million and $591 million at December 31, 2018 and 2017, respectively. At December 31, 2018, discount rates by year ranged from 2.0% to 6.5%, with a weighted average discount rate of 3.8%.

Substantially all discounted workers’ compensation reserves (97% of total discounted reserves at December 31, 2018) are excess workers’ compensation reserves. In order to properly match loss expenses with income earned on investment securities supporting the liabilities, reserves for excess workers’ compensation business are discounted using risk-free discount rates determined by reference to the U.S. Treasury yield curve. These rates are determined annually based on the weighted average rate for the period. Once established, no adjustments are made to the discount rate for that period, and any increases or decreases in loss reserves in subsequent years are discounted at the same rate, without regard to when any such adjustments are recognized. The expected loss and loss expense payout patterns subject to discounting are derived from the Company’s loss payout experience.

The Company also discounts reserves for certain other long-duration workers’ compensation reserves (representing approximately 3% of total discounted reserves at December 31, 2018), including reserves for quota share reinsurance and reserves related to losses regarding occupational lung disease. These reserves are discounted at statutory rates prescribed or permitted by the Department of Insurance of the State of Delaware.

Assumed Reinsurance Premiums. The Company estimates the amount of assumed reinsurance premiums that it will receive under treaty reinsurance agreements at the inception of the contracts. These premium estimates are revised as the actual amount of assumed premiums is reported to the Company by the ceding companies. As estimates of assumed premiums are made or revised, the related amount of earned premiums, commissions and incurred losses associated with those premiums are recorded. Estimated assumed premiums receivable were approximately $41 million and $56 million at December 31, 2018 and 2017, respectively. The assumed premium estimates are based upon terms set forth in reinsurance agreements, information received from ceding companies during the underwriting and negotiation of agreements, reports received from ceding companies and discussions and correspondence with reinsurance intermediaries. The Company also considers its own view of market conditions, economic trends and experience with similar lines of business. These premium estimates represent management’s best estimate of the ultimate amount of premiums to be received under its assumed reinsurance agreements.

Other-Than-Temporary Impairments (OTTI) of Investments. The cost of securities is adjusted where appropriate to include a provision for decline in value which is considered to be other-than-temporary. An other-than-temporary decline is considered to occur in investments where there has been a sustained reduction in fair value and where the Company does not expect the fair value to recover prior to the time of sale or maturity.

The Company classifies its fixed maturity securities by credit rating, primarily based on ratings assigned by credit rating agencies. For purposes of classifying securities with different ratings, the Company uses the average of the credit ratings assigned, unless in limited situations the Company's own analysis indicates an internal rating is more appropriate. Securities that are not rated by a rating agency are evaluated and classified by the Company on a case-by-case basis.

Fixed Maturity Securities – For securities that we intend to sell or, more likely than not, would be required to sell, a decline in value below amortized cost is considered to be OTTI. The amount of OTTI is equal to the difference between amortized cost and fair value at the balance sheet date. For securities that we do not intend to sell or expect to be required to sell, a decline in value below amortized cost is considered to be an OTTI if we do not expect to recover the entire amortized cost basis of a security (i.e., the present value of cash flows expected to be collected is less than the amortized cost basis of the security).

The portion of the decline in value considered to be a credit loss (i.e., the difference between the present value of cash flows expected to be collected and the amortized cost basis of the security) is recognized in earnings. The portion of the decline in value not considered to be a credit loss (i.e., the difference in the present value of cash flows expected to be collected and the fair value of the security) is recognized in other comprehensive income.

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Impairment assessments for structured securities, including mortgage-backed securities and asset-backed securities, collateralized debt obligations and corporate debt, are generally evaluated based on the performance of the underlying collateral under various economic and default scenarios that may involve subjective judgments and estimates by management. Modeling these securities involves various factors, such as projected default rates, the nature and realizable value of the collateral, if any, the ability of the issuer to make scheduled payments, historical performance and other relevant economic and performance factors. If an OTTI determination is made, a discounted cash flow analysis is used to ascertain the amount of the credit impairment.

The following table provides a summary of fixed maturity securities in an unrealized loss position as of December 31, 2018:

($ in thousands)	Number of Securities	Aggregate Fair Value		Unrealized Loss
Unrealized loss less than 20% of amortized cost	1,068	$	7,823,120	$	201,258
Unrealized loss of 20% or greater of amortized cost:
Less than twelve months	6	14,553		6,435
Twelve months and longer	4	23,837		7,870
Total	1,078	$	7,861,510	$	215,563

A summary of the Company’s non-investment grade fixed maturity securities that were in an unrealized loss position at December 31, 2018 is presented in the table below.

 

($ in thousands)	Number of Securities	Aggregate Fair Value		Unrealized Loss
Foreign government	13	$	140,854	$	21,411
Corporate	13	120,078		13,111
Asset-backed securities	5	14,662		2,593
Mortgage-backed securities	5	8,741		69
Total	36	$	284,335	$	37,184

The Company has evaluated its fixed maturity securities in an unrealized loss position and believes the unrealized loss is due primarily to temporary market and sector-related factors rather than to issuer-specific factors. None of these securities are delinquent or in default under financial covenants. Based on its assessment of these issuers, the Company expects them to continue to meet their contractual payment obligations as they become due and does not consider any of these securities to be OTTI. For the year ended December 31, 2018, OTTI for fixed maturity securities recognized in earnings were $5.7 million. For the year ended December 31, 2017, there were no OTTI for fixed maturity securities.

Loans Receivable – The Company monitors the performance of its loans receivable, including current market conditions for each loan and the ability to collect principal and interest. For loans where the Company determines it is probable that the contractual terms will not be met, an analysis is performed and a valuation reserve is established, if necessary, with a charge to earnings. Loans receivable are reported net of a valuation reserve of $3 million for both December 31, 2018 and 2017.

The Company monitors the performance of its loans receivable and assesses the ability of each borrower to pay principal and interest based upon loan structure, underlying property values, cash flow and related financial and operating performance of the property and market conditions. Loans receivable with a potential for default are further assessed using discounted cash flow analysis and comparable cost and sales methodologies, if appropriate.

Fair Value Measurements. The Company’s fixed maturity available for sale securities, equity securities, and its trading account securities are carried at fair value. Fair value is defined as "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". The Company utilizes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value into three broad levels. Level 1 inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities that the reporting entity has the ability to access at the measurement date. Level 2 inputs are inputs other than quoted prices included within Level 1 that are observable for similar assets in active markets. Level 3 inputs are unobservable inputs for the asset or liability. Unobservable inputs may only be used to measure fair value to the extent that observable inputs are not available. The fair value of the vast majority of the Company’s portfolio is based on observable data (other than quoted prices) and, accordingly, is classified as Level 2.

In classifying particular financial securities in the fair value hierarchy, the Company uses its judgment to determine whether the market for a security is active and whether significant pricing inputs are observable. The Company determines the

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existence of an active market by assessing whether transactions occur with sufficient frequency and volume to provide reliable pricing information. The Company determines whether inputs are observable based on the use of such information by pricing services and external investment managers, the uninterrupted availability of such inputs, the need to make significant adjustments to such inputs and the volatility of such inputs over time. If the market for a security is determined to be inactive or if significant inputs used to price a security are determined to be unobservable, the security is categorized in Level 3 of the fair value hierarchy.

Because many fixed maturity securities do not trade on a daily basis, the Company utilizes pricing models and processes which may include benchmark curves, benchmarking of like securities, sector groupings and matrix pricing. Market inputs used to evaluate securities include benchmark yields, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers and reference data. Quoted prices are often unavailable for recently issued securities that are infrequently traded or securities that are only traded in private transactions. For publicly traded securities for which quoted prices are unavailable, the Company determines fair value based on independent broker quotations and other observable market data. For securities traded only in private negotiations, the Company determines fair value based primarily on the cost of such securities, which is adjusted to reflect prices of recent placements of securities of the same issuer, financial data, projections and business developments of the issuer and other relevant information.

The following is a summary of pricing sources for the Company's fixed maturity securities available for sale as of December 31, 2018:

 

(In thousands)	Carrying Value		Percent of Total
Pricing source:
Independent pricing services	$	13,351,637	98.7	%
Syndicate manager	34,304		0.3
Directly by the Company based on:
Observable data	142,137		1.0
Cash flow model	99		—
Total	$	13,528,177	100.0	%

Independent pricing services - Substantially all of the Company’s fixed maturity securities available for sale were priced by independent pricing services (generally one U.S. pricing service plus additional pricing services with respect to a limited number of foreign securities held by the Company). The prices provided by the independent pricing services are generally based on observable market data in active markets (e.g., broker quotes and prices observed for comparable securities). The determination of whether markets are active or inactive is based upon the volume and level of activity for a particular asset class. The Company reviews the prices provided by pricing services for reasonableness based upon current trading levels for similar securities. If the prices appear unusual to the Company, they are re-examined and the value is either confirmed or revised. In addition, the Company periodically performs independent price tests of a sample of securities to ensure proper valuation and to verify our understanding of how securities are priced. As of December 31, 2018, the Company did not make any adjustments to the prices provided by the pricing services. Based upon the Company’s review of the methodologies used by the independent pricing services, these securities were classified as Level 2.

Syndicate manager – The Company has a 15% participation in a Lloyd’s syndicate, and the Company’s share of the securities owned by the syndicate is priced by the syndicate’s manager. The majority of the securities are liquid, short duration fixed maturity securities. The Company reviews the syndicate manager’s pricing methodology and audited financial statements and holds discussions with the syndicate manager as necessary to confirm its understanding and agreement with security prices. Based upon the Company’s review of the methodologies used by the syndicate manager, these securities were classified as Level 2.

Observable data – If independent pricing is not available, the Company prices the securities directly. Prices are based on observable market data where available, including current trading levels for similar securities and non-binding quotations from brokers. The Company generally requests two or more quotes. If more than one quote is received, the Company sets a price within the range of quotes received based on its assessment of the credibility of the quote and its own evaluation of the security. The Company generally does not adjust quotes obtained from brokers. Since these securities were priced based on observable data, they were classified as Level 2.

Cash flow model – If the above methodologies are not available, the Company prices securities using a discounted cash flow model based upon assumptions as to prevailing credit spreads, interest rates and interest rate volatility, time to maturity and subordination levels. Discount rates are adjusted to reflect illiquidity where appropriate. These securities were classified as Level 3.

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Results of Operations for the Years Ended December 31, 2018 and 2017

Business Segment Results

Following is a summary of gross and net premiums written, net premiums earned, loss ratios (losses and loss expenses incurred expressed as a percentage of net premiums earned), expense ratios (underwriting expenses expressed as a percentage of net premiums earned) and GAAP combined ratios (sum of loss ratio and expense ratio) for each of our business segments for the years ended December 31, 2018 and 2017. The GAAP combined ratio represents a measure of underwriting profitability, excluding investment income. A GAAP combined ratio in excess of 100 indicates an underwriting loss; a number below 100 indicates an underwriting profit. 

(In thousands)	2018			2017
Insurance
Gross premiums written	$	7,157,370		$	6,869,831
Net premiums written	5,952,861			5,715,871
Net premiums earned	5,864,981			5,706,443
Loss ratio	61.8		%	61.6		%
Expense ratio	32.5			32.9
GAAP combined ratio	94.3			94.5
Reinsurance
Gross premiums written	$	545,124		$	607,132
Net premiums written	480,366			544,637
Net premiums earned	506,524			604,976
Loss ratio	68.7		%	80.2		%
Expense ratio	37.7			37.4
GAAP combined ratio	106.4			117.6
Consolidated
Gross premiums written	$	7,702,494		$	7,476,963
Net premiums written	6,433,227			6,260,508
Net premiums earned	6,371,505			6,311,419
Loss ratio	62.4		%	63.4		%
Expense ratio	32.9			33.3
GAAP combined ratio	95.3			96.7

Net Income to Common Stockholders. The following table presents the Company’s net income to common stockholders and net income per diluted share for the years ended December 31, 2018 and 2017.

(In thousands, except per share data)	2018		2017
Net income to common stockholders	$	640,749	$	549,094
Weighted average diluted shares	128,264		129,018
Net income per diluted share	$	5.00	$	4.26

The Company reported net income of $641 million in 2018 compared to $549 million in 2017. The 17% increase in net income was primarily due to an after-tax increase in net investment income of $79 million, mainly driven by growth in the fixed maturity security portfolio, higher interest rates and an increase in investment funds, an after-tax increase in underwriting income of $72 million, a $34 million increase in after-tax foreign currency gains, an after-tax increase in non-insurance businesses of $6 million, and a $60 million decrease in tax expense primarily due to the reduction of the federal corporate tax rate from 35% to 21%, partially offset by a decrease in after-tax net investment gains of $145 million, an after-tax increase in interest expense of $8 million, an after-tax reduction in insurance service fee income of $4 million, and an after-tax increase in corporate expenses of $2 million. The number of weighted average diluted shares decreased slightly primarily due to share repurchases.

Premiums. Gross premiums written were $7,702 million in 2018, an increase of 3% from $7,477 million in 2017. The increase was due to an increase in the Insurance segment of $287 million, partially offset by a decrease in the Reinsurance segment of $62 million. Approximately 78% of policies expiring in 2018 were renewed and 79% of policies expiring in 2017 were renewed.

Average renewal premium rates (adjusted for change in exposures) increased 2.5% in 2018, 0.9% in 2017 and 0.3% in 2016.

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A summary of gross premiums written in 2018 compared with 2017 by line of business within each business segment follows:

• Insurance gross premiums increased 4% to $7,157 million in 2018 from $6,870 million in 2017. Gross premiums increased $156 million (7%) for other liability, $87 million (12%) for professional liability, $64 million (4%) for short-tail lines and $54 million (7%) for commercial auto, and decreased $74 million (4%) for workers' compensation.

• Reinsurance gross premiums decreased 10% to $545 million in 2018 from $607 million in 2017. Gross premiums written decreased $38 million (19%) for property lines and decreased $24 million (6%) for casualty lines.

Net premiums written were $6,433 million in 2018, an increase of 3% from $6,261 million in 2017. Ceded reinsurance premiums as a percentage of gross written premiums were 17% and 16% in 2018 and 2017, respectively.

Premiums earned increased 1% to $6,372 million in 2018 from $6,311 million in 2017. Insurance premiums (including the impact of rate changes) are generally earned evenly over the policy term, and accordingly recent rate increases will be earned over the upcoming quarters. Premiums earned in 2018 are related to business written during both 2018 and 2017. Audit premiums were $192 million in 2018 compared with $172 million in 2017.

Net Investment Income. Following is a summary of net investment income for the years ended December 31, 2018 and 2017:

	Amount						Average Annualized Yield
(In thousands)	2018			2017			2018		2017
Fixed maturity securities, including cash and cash equivalents and loans receivable	$	519,269		$	473,101		3.6	%	3.3	%
Investment funds	109,349			68,169			8.8		5.7
Arbitrage trading account	28,157			19,145			4.7		3.6
Real estate	18,591			19,975			1.0		1.5
Equity securities	3,230			2,350			1.4		1.1
Gross investment income	678,596			582,740			3.7		3.3
Investment expenses	(4,361		)	(6,952		)	—		—
Total	$	674,235		$	575,788		3.7	%	3.3	%

Net investment income increased 17% to $674 million in 2018 from $576 million in 2017 primarily due to an increase in income from fixed maturity securities of $46 million, a $41 million increase in investment funds, a $9 million increase in arbitrage trading account and a decrease in investment expenses of $2 million, partially offset by a decrease in real estate of $1 million. Investment funds are reported on a one quarter lag. The average annualized yield for fixed maturity securities was 3.6% in 2018 and 3.3% in 2017; accordingly, the increase in fixed maturity securities income was mainly the result of a larger investment portfolio and higher interest rates. The effective duration of the fixed maturity portfolio was 2.8 years at December 31, 2018, down from 3.0 years at December 31, 2017. The Company has maintained a shortened duration of its fixed maturity security portfolio. This has reduced the potential impact of mark-to-market adjustments on the portfolio and positioned the Company to take advantage of rising interest rates. Average invested assets, at cost (including cash and cash equivalents), were $18.4 billion in 2018 and $17.5 billion in 2017.

Insurance Service Fees. The Company earns fees from an insurance distribution business, a third-party administrator, and as a servicing carrier of workers' compensation assigned risk plans for certain states. Insurance service fees were $118 million in 2018 and $135 million in 2017. The decrease is primarily due to the sale of a third party administration business in third quarter of 2018.

Net Realized and Unrealized Gains on Investments. The Company buys and sells securities and other investment assets on a regular basis in order to maximize its total return on investments. Decisions to sell securities and other investment assets are based on management’s view of the underlying fundamentals of specific investments as well as management’s expectations regarding interest rates, credit spreads, currency values and general economic conditions. Effective January 1, 2018, the Company adopted new accounting guidance that requires all equity investments with readily determinable fair values to be measured at fair value with changes in the fair value recognized through net income (other than those equity securities accounted for under the equity method of accounting or those that result in consolidation of the investee). Net realized and unrealized gains on investments were $154 million in 2018 compared with $336 million in 2017. In 2018, the gains reflected net realized gains on investment sales of $480 million reduced by a change in unrealized gains on equity securities of $320

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million as well as $6 million in OTTI. In 2017, realized gains were primarily related to the sale of an investment in an office building located in Washington, D.C. and the sale of shares of a publicly traded common stock.

Other-Than-Temporary Impairments. The cost of securities is adjusted when appropriate to include a provision for a decline in value that is considered to be other-than-temporary. In 2018, there was $6 million other-than-temporary impairments. There was no other-than-temporary impairments in 2017.

Revenues from Non-Insurance Businesses. Revenues from non-insurance businesses were derived from businesses engaged in the distribution of promotional merchandise, world-wide textile solutions, and aviation-related businesses that provide services to aviation markets, including (i) the distribution, manufacturing, repair and overhaul of aircraft parts and components, (ii) the sale of new and used aircraft, and (iii) avionics, fuel, maintenance, storage and charter services. Revenues from non-insurance businesses increased to $373 million in 2018 from $326 million in 2017, primarily due to the purchase of a business in the second half of 2018 and revenues from a textile business purchased in March 2017.

Losses and Loss Expenses. Losses and loss expenses decreased to $3,975 million in 2018 from $4,002 million in 2017. The consolidated loss ratio was 62.4% in 2018 and 63.4% in 2017. Catastrophe losses, net of reinsurance recoveries and reinstatement premiums, were $105 million in 2018 compared with $184 million in 2017. The more significant 2017 catastrophe losses largely related to hurricanes Harvey, Irma, and Maria, along with two earthquakes in Mexico. Favorable prior year reserve development (net of premium offsets) was $39 million in 2018 compared with $37 million in 2017. The loss ratio excluding catastrophe losses and prior year reserve development increased 0.2 points to 61.3% in 2018 from 61.1% in 2017.

A summary of loss ratios in 2018 compared with 2017 by business segment follows:

• Insurance - The loss ratio of 61.8% in 2018 was 0.2 points higher than the loss ratio of 61.6% in 2017. Catastrophe losses were $76 million in 2018 compared with $107 million in 2017. Favorable prior year reserve development was $43 million in 2018 compared with $68 million in 2017. The loss ratio excluding catastrophe losses and prior year reserve development increased 0.3 points to 61.2% in 2018 from 60.9% in 2017.

• Reinsurance - The loss ratio of 68.7% in 2018 was 11.5 points lower than the loss ratio of 80.2% in 2017. Catastrophe losses were $29 million in 2018 compared with $77 million in 2017. Adverse prior year reserve development was $4 million in 2018 compared with adverse prior year reserve development $31 million in 2017. Adverse prior year development in 2017 was largely due to the impact of the change in Ogden discount rate in the U.K. and adverse development related to the U.S. facultative excess of loss business. The loss ratio excluding catastrophe losses and prior year reserve development decreased 0.2 points to 62.1% in 2018 from 62.3% in 2017.

Other Operating Costs and Expenses. Following is a summary of other operating costs and expenses:

(In thousands)	2018			2017
Policy acquisition and insurance operating expenses	$	2,098,881		$	2,101,024
Insurance service expenses	118,357			129,776
Net foreign currency (gains) losses	(27,067		)	15,267
Other costs and expenses	193,050			190,865
Total	$	2,383,221		$	2,436,932

Policy acquisition and insurance operating expenses are comprised of commissions paid to agents and brokers, premium taxes and other assessments and internal underwriting costs. Policy acquisition and insurance operating expenses remained flat and net premiums earned increased 1% from 2017. The expense ratio (policy acquisition and insurance operating expenses expressed as a percentage of premiums earned) was 32.9% in 2018 and 33.3% in 2017.

Service expenses, which represent the costs associated with the fee-based businesses, decreased 9% to $118 million in 2018 from $130 million in 2017. The decrease is primarily due to the sale of a third party administration business in third quarter of 2018.

Net foreign currency (gains) losses result from transactions denominated in a currency other than an operating unit’s functional currency. Net foreign currency gains were $27 million in 2018 compared to losses of $15 million in 2017, resulting from the strengthening U.S. dollar and the change of functional currency for the Company's Argentine operations to the U.S. dollar as of July 1, 2018. The Argentine economy was determined to be highly inflationary under GAAP requiring the change in functional currency beginning with the third quarter of 2018.

Other costs and expenses represent general and administrative expenses of the parent company and other expenses not allocated to business segments, including the cost of certain long-term incentive plans and new business ventures. Other costs and expenses increased to $193 million in 2018 from $191 million in 2017.

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Expenses from Non-Insurance Businesses. Expenses from non-insurance businesses represent costs associated with businesses engaged in the distribution of promotional merchandise, world-wide textile solutions, and aviation-related businesses that include (i) cost of goods sold related to aircraft and products sold and services provided, and (ii) general and administrative expenses. Expenses from non-insurance businesses were $364 million in 2018 compared to $325 million in 2017. The increase mainly relates to a new business purchased in the second half of 2018 as well as the textile business purchased in March 2017.

Interest Expense. Interest expense was $157 million in 2018 compared with $147 million in 2017. In March 2018, the Company issued $175 million aggregate principal amount of 5.70% subordinated debentures due 2058, and in April 2018, the Company issued another $10 million principal amount of such debentures. Additionally in 2018, the Company issued subsidiary debt of $116 million, which was primarily attributable to a non-recourse mortgage loan on a real estate property in Florida.

Income Taxes. The effective income tax rate was 20% in 2018 compared to 28% in 2017. The decrease in the effective tax rate in 2018 from 2017 was primarily due to the Tax Cuts and Jobs Act of 2017, which reduced the federal corporate tax rate from 35% to 21%.

The Company has not provided U.S. deferred income taxes on the undistributed earnings of approximately $70 million of its non-U.S. subsidiaries since these earnings are intended to be permanently reinvested in the non-U.S. subsidiaries. In the future, if such earnings were distributed the Company projects that the incremental tax, if any, will be immaterial.

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Results of Operations for the Years Ended December 31, 2017 and 2016

Business Segment Results

Following is a summary of gross and net premiums written, net premiums earned, loss ratios (losses and loss expenses incurred expressed as a percentage of net premiums earned), expense ratios (underwriting expenses expressed as a percentage of net premiums earned) and GAAP combined ratios (sum of loss ratio and expense ratio) for each of our business segments for the years ended December 31, 2017 and 2016. The GAAP combined ratio represents a measure of underwriting profitability, excluding investment income. A GAAP combined ratio in excess of 100 indicates an underwriting loss; a number below 100 indicates an underwriting profit. 

(In thousands)	2017			2016
Insurance
Gross premiums written	$	6,869,831		$	6,795,506
Net premiums written	5,715,871			5,743,620
Net premiums earned	5,706,443			5,618,842
Loss ratio	61.6		%	61.0		%
Expense ratio	32.9			32.5
GAAP combined ratio	94.5			93.5
Reinsurance
Gross premiums written	$	607,132		$	748,195
Net premiums written	544,637			680,293
Net premiums earned	604,976			674,506
Loss ratio	80.2		%	61.6		%
Expense ratio	37.4			39.0
GAAP combined ratio	117.6			100.6
Consolidated
Gross premiums written	$	7,476,963		$	7,543,701
Net premiums written	6,260,508			6,423,913
Net premiums earned	6,311,419			6,293,348
Loss ratio	63.4		%	61.1		%
Expense ratio	33.3			33.2
GAAP combined ratio	96.7			94.3

Net Income to Common Stockholders. The following table presents the Company’s net income to common stockholders and net income per diluted share for the years ended December 31, 2017 and 2016.

(In thousands, except per share data)	2017		2016
Net income to common stockholders	$	549,094	$	601,916
Weighted average diluted shares	129,018		128,553
Net income per diluted share	$	4.26	$	4.68

The Company reported net income of $549 million in 2017 compared to $602 million in 2016. The 9% decrease in net income was primarily due to a decrease in after-tax underwriting income of $98 million (mainly driven by increased catastrophe losses from hurricanes Harvey, Irma, and Maria, two earthquakes in Mexico, and wildfires in California), an after-tax increase of $18 million in net foreign currency losses, an after-tax decrease in income from non-insurance businesses of $9 million, an increase in after-tax interest expense of $4 million, and an increase in after-tax other expenses of $7 million, partially offset by an increase in after-tax net investment gains of $45 million, a net benefit from tax reform of $21 million, an increase in after-tax net investment income of $8 million, an after-tax increase of $3 million in service fee income and an increase in income from other various sources of $6 million. The number of weighted average diluted shares remained relatively unchanged for 2017 and 2016.

Premiums. Gross premiums written were $7,477 million in 2017, a decrease of 1% from $7,544 million in 2016. The decrease was due to a decrease in the Reinsurance segment of $141 million, partially offset by an increase in the Insurance segment of $74 million. Approximately 79% of policies expiring in 2017 were renewed and 77% of policies expiring in 2016 were renewed.

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Average renewal premium rates (adjusted for change in exposures) increased 0.9% in 2017, 0.3% in 2016 and 1.2% in 2015. However, overall loss costs are also increasing, and current market price levels for certain lines of business remain below the prices required for the Company to achieve its long-term return objectives.

A summary of gross premiums written in 2017 compared with 2016 by line of business within each business segment follows:

• Insurance gross premiums increased 1% to $6,870 million in 2017 from $6,796 million in 2016. Gross premiums increased $40 million (6%) for commercial auto, $37 million (5%) for professional liability, $6 million (less than 1%) for other liability, and $4 million (less than 1%) for short-tail lines, partially offset by a decrease of $13 million (1%) for workers' compensation.

• Reinsurance gross premiums decreased 19% to $607 million in 2017 from $748 million in 2016. Gross premiums written decreased $108 million (35%) for property lines and decreased $33 million (7%) for casualty lines.

Net premiums written were $6,261 million in 2017, a decrease of 3% from $6,424 million in 2016. Ceded reinsurance premiums as a percentage of gross written premiums were 16% in 2017 and 15% in 2016.

Premiums earned increased less than 1% to $6,311 million in 2017 from $6,293 million in 2016. Insurance premiums (including the impact of rate changes) are generally earned evenly over the policy term, and accordingly recent rate increases will be earned over the upcoming quarters. Premiums earned in 2017 are related to business written during both 2017 and 2016. Audit premiums were $172 million in 2017 compared with $156 million in 2016.

Net Investment Income. Following is a summary of net investment income for the years ended December 31, 2017 and 2016:

	Amount						Average Annualized Yield
(In thousands)	2017			2016			2017		2016
Fixed maturity securities, including cash and cash equivalents and loans receivable	$	473,101		$	444,247		3.3	%	3.2	%
Investment funds	68,169			99,301			5.7		8.1
Real estate	19,975			7,054			1.5		0.7
Arbitrage trading account	19,145			18,693			3.6		4.8
Equity securities available for sale	2,350			4,028			1.1		2.1
Gross investment income	582,740			573,323			3.3		3.4
Investment expenses	(6,952		)	(9,160		)	—		—
Total	$	575,788		$	564,163		3.3	%	3.4	%

Net investment income increased 2% to $576 million in 2017 from $564 million in 2016 primarily due to an increase in income from fixed maturity securities of $29 million, as well as real estate of $13 million and a decrease in investment expenses of $2 million, partially offset by a decrease in investment funds of $31 million. Investment funds are reported on a one quarter lag. The average annualized yield for fixed maturity securities was 3.3% in 2017 and 3.2% in 2016; accordingly the increase in fixed maturity securities income was mainly the result of a larger investment portfolio. The effective duration of the fixed maturity portfolio was 3.0 years at December 31, 2017, down from 3.1 years at December 31, 2016. Average invested assets, at cost (including cash and cash equivalents), were $17.5 billion in 2017 and $16.7 billion in 2016.

Insurance Service Fees. The Company earns fees from an insurance distribution business, a third-party administrator, and as a servicing carrier of workers' compensation assigned risk plans for certain states. Insurance service fees were $135 million in 2017 and $139 million in 2016.

Net Realized Gains on Investment Sales. The Company buys and sells securities and other investment assets on a regular basis in order to maximize its total return on investments. Decisions to sell securities and other investment assets are based on management’s view of the underlying fundamentals of specific investments as well as management’s expectations regarding interest rates, credit spreads, currency values and general economic conditions. Net realized gains on investment sales were $336 million in 2017 compared with $285 million in 2016. In 2017, realized gains were primarily related to the sale of an investment in an office building located in Washington, D.C. and the sale of some shares of a publicly traded common stock. In 2016, realized gains were primarily related to the sale of Aero Precision Industries and the sale of some shares of a publicly traded common stock.

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Other-Than-Temporary Impairments. The cost of securities is adjusted where appropriate to include a provision for a decline in value that is considered to be other-than-temporary. There were no other-than-temporary impairments in 2017 as compared to $18 million in 2016 primarily related to common stocks.

Revenues from Non-Insurance Businesses. Revenues from non-insurance businesses were derived from businesses engaged in the distribution of promotional merchandise, world-wide textile solutions, and aviation-related businesses that provide services to aviation markets, including (i) the distribution, manufacturing, repair and overhaul of aircraft parts and components, (ii) the sale of new and used aircraft, and (iii) avionics, fuel, maintenance, storage and charter services. Revenues from non-insurance businesses decreased to $326 million in 2017 from $390 million in 2016, primarily due to the sale of Aero Precision Industries in August 2016, partially offset by revenues from the textile business purchased in March 2017.

Losses and Loss Expenses. Losses and loss expenses increased to $4,002 million in 2017 from $3,846 million in 2016. The consolidated loss ratio was 63.4% in 2017 and 61.1% in 2016. Catastrophe losses, net of reinsurance recoveries and reinstatement premiums, were $184 million in 2017 compared with $105 million in 2016, an increase of 1.2 loss ratio points. Favorable prior year reserve development (net of premium offsets) was $37 million in 2017 compared with $59 million in 2016, a difference of 0.3 loss ratio points (see "- Critical Accounting Estimates - Reserves for Losses and Loss Expenses"). The loss ratio excluding catastrophe losses and prior year reserve development increased 0.8 points to 61.1% in 2017 from 60.3% in 2016.

A summary of loss ratios in 2017 compared with 2016 by business segment follows:

• Insurance - The loss ratio of 61.6% in 2017 was 0.6 points higher than the loss ratio of 61.0% in 2016. Catastrophe losses were $107 million in 2017 compared with $89 million in 2016, an increase of 0.4 loss ratio points. Favorable prior year reserve development was $68 million in 2017 compared with $53 million in 2016, a decrease of 0.3 loss ratio points. The loss ratio excluding catastrophe losses and prior year reserve development increased 0.5 points to 60.9% in 2017 from 60.4% in 2016.

• Reinsurance - The loss ratio of 80.2% in 2017 was 18.6 points higher than the loss ratio of 61.6% in 2016. Catastrophe losses were $77 million in 2017 compared with $16 million in 2016, an increase of 10.3 loss ratio points. Adverse prior year reserve development was $31 million in 2017 compared with favorable prior year reserve development of $6 million in 2016, a difference of 6.0 loss ratio points. Adverse prior year development in 2017 was largely due to the impact of the change in Ogden discount rate in the U.K. and adverse development related to the U.S. facultative excess of loss business. The loss ratio excluding catastrophe losses and prior year reserve development increased 2.3 points to 62.3% in 2017 from 60.0% in 2016.

Other Operating Costs and Expenses. Following is a summary of other operating costs and expenses:

(In thousands)	2017		2016
Policy acquisition and insurance operating expenses	$	2,101,024	$	2,089,203
Insurance service expenses	129,776		138,908
Net foreign currency losses (gains)	15,267		(11,904		)
Other costs and expenses	190,865		179,412
Total	$	2,436,932	$	2,395,619

Policy acquisition and insurance operating expenses are comprised of commissions paid to agents and brokers, premium taxes and other assessments and internal underwriting costs. Policy acquisition and insurance operating expenses increased less than 1% compared with the increase in net premiums earned of less than 1%. The expense ratio (policy acquisition and insurance operating expenses expressed as a percentage of premiums earned) was 33.3% in 2017 and 33.2% in 2016.

Insurance service expenses, which represent the costs associated with the fee-based businesses, decreased 7% to $130 million from $139 million in 2016.

Net foreign currency (gains) losses result from transactions denominated in a currency other than an operating unit’s functional currency. Net foreign currency losses were $15 million in 2017 compared to gains of $12 million in 2016.

Other costs and expenses represent general and administrative expenses of the parent company and other expenses not allocated to business segments, including the cost of certain long-term incentive plans and new business ventures. Other costs and expenses increased to $191 million in 2017 from $179 million in 2016 primarily because of startup costs for new business ventures.

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Expenses from Non-Insurance Businesses. Expenses from non-insurance businesses represent costs associated with businesses engaged in the distribution of promotional merchandise, world-wide textile solutions, and aviation-related businesses that include (i) cost of goods sold related to aircraft and products sold and services provided, and (ii) general and administrative expenses. Expenses from non-insurance businesses were $325 million in 2017 compared to $375 million in 2016. The decline mainly relates to the sale of Aero Precision Industries in August 2016, partially offset by expenses from the textile business purchased in March 2017.

Interest Expense. Interest expense was $147 million in 2017 compared with $141 million in 2016. During 2016, the Company repaid $83 million of debt mainly in connection with the sale of Aero Precision Industries. In February 2016, the company issued $110 million of 5.9% subordinated debentures maturing in 2056, and in May 2016, the Company issued $290 million of 5.75% subordinated debentures maturing in 2056. During 2017, one of the Company's non-insurance subsidiaries issued $7 million of debt.

Income Taxes. The effective income tax rate was 28% in 2017 compared to 33% in 2016. The lower tax rate in 2017 was due, in part, to tax reform (the Tax Cuts and Jobs Act of 2017) as well as the new requirement under U.S. GAAP in 2017 to recognize tax benefits for stock compensation in income tax expense. The effective income tax rate differs from the federal income tax rate of 35% primarily because of tax-exempt investment income and previously mentioned additional 2017 tax impacts.

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Investments

As part of its investment strategy, the Company establishes a level of cash and highly liquid short-term and intermediate-term securities that, combined with expected cash flow, it believes is adequate to meet its payment obligations. Due to the low fixed maturity investment returns, the Company invests in equity securities, merger arbitrage securities, investment funds, private equity, loans and real estate related assets. The Company's investments in investment funds and its other alternative investments have experienced, and the Company expects to continue to experience, greater fluctuations in investment income.

The Company also attempts to maintain an appropriate relationship between the effective duration of the investment portfolio and the approximate duration of its liabilities (i.e., policy claims and debt obligations). The effective duration of the investment portfolio was 2.8 years and 3.0 years at December 31, 2018 and 2017, respectively. The Company’s investment portfolio and investment-related assets as of December 31, 2018 were as follows:

($ in thousands)	Carrying Value		Percent of Total
Fixed maturity securities:
U.S. government and government agencies	$	702,240	3.8	%
State and municipal:
Special revenue	2,425,868		13.1
Pre-refunded (1)	430,169		2.3
Local general obligation	425,337		2.3
State general obligation	384,706		2.1
Corporate backed	274,409		1.5
Total state and municipal	3,940,489		21.3
Mortgage-backed securities:
Agency	920,496		5.0
Commercial	342,666		1.8
Residential-Prime	303,229		1.6
Residential-Alt A	38,899		0.2
Total mortgage-backed securities	1,605,290		8.6
Asset-backed securities	2,438,747		13.2
Corporate:
Industrial	2,257,821		12.2
Financial	1,463,922		7.9
Utilities	329,175		1.8
Other	60,393		0.3
Total corporate	4,111,311		22.2
Foreign government	808,735		4.4
Total fixed maturity securities	13,606,812		73.5
Equity securities available for sale:
Preferred stocks	180,814		1.0
Common stocks	98,192		0.5
Total equity securities available for sale	279,006		1.5
Real estate	1,957,092		10.5
Investment funds	1,332,818		7.2
Cash and cash equivalents	817,602		4.4
Arbitrage trading account	452,548		2.4
Loans receivable	94,813		0.5
Total investments	$	18,540,691	100.0	%

  ______________

(1) Pre-refunded securities are securities for which an escrow account has been established to fund the remaining payments of principal and interest through maturity. Such escrow accounts are funded almost exclusively with U.S. Treasury and U.S. government agency securities.

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Fixed Maturity Securities. The Company’s investment policy with respect to fixed maturity securities is generally to purchase instruments with the expectation of holding them to their maturity. However, management of the available for sale portfolio is considered necessary to maintain an approximate matching of assets and liabilities as well as to adjust the portfolio as a result of changes in financial market conditions and tax considerations.

The Company’s philosophy related to holding or selling fixed maturity securities is based on its objective of maximizing total return. The key factors that management considers in its investment decisions as to whether to hold or sell fixed maturity securities are its view of the underlying fundamentals of specific securities as well as its expectations regarding interest rates, credit spreads and currency values. In a period in which management expects interest rates to rise, the Company may sell longer duration securities in order to mitigate the impact of an interest rate rise on the fair value of the portfolio. Similarly, in a period in which management expects credit spreads to widen, the Company may sell lower quality securities, and in a period in which management expects certain foreign currencies to decline in value, the Company may sell securities denominated in those foreign currencies. The sale of fixed maturity securities in order to achieve the objective of maximizing total return may result in realized gains; however, there is no reason to expect these gains to continue in future periods.

Equity Securities. Equity securities primarily represent investments in common and preferred stocks in companies with potential growth opportunities in different sectors, mainly in the financial institutions sector.

Investment Funds. At December 31, 2018, the carrying value of investment funds was $1,333 million, including investments in real estate funds of $642 million, energy funds of $75 million, and other funds of $616 million. Investment funds are primarily reported on a one-quarter lag.

Real Estate. Real estate is directly owned property held for investment. At December 31, 2018, real estate properties in operation included a long-term ground lease in Washington D.C., a hotel in Memphis, Tennessee, two office complexes in New York City, office buildings in West Palm Beach and Palm Beach, Florida, and an office building in London. In addition, there is a mixed-use project in Washington D.C. under development. The Company expects to fund further development costs for the project with a combination of its own funds and external financing.

Arbitrage Trading Account. The arbitrage trading account is comprised of direct investments in arbitrage securities. Merger arbitrage is the business of investing in the securities of publicly held companies that are the targets in announced tender offers and mergers.

Loans Receivable. Loans receivable, which are carried at amortized cost, had an amortized cost of $95 million and an aggregate fair value of $97 million at December 31, 2018. The amortized cost of loans receivable is net of a valuation allowance of $3 million as of December 31, 2018. Loans receivable include real estate loans of $62 million that are secured by commercial real estate located primarily in New York. Real estate loans receivable generally earn interest at floating LIBOR-based interest rates and have maturities (inclusive of extension options) through August 2025. Loans receivable include commercial loans of $33 million that are secured by business assets and have fixed interest rates and varying maturities not exceeding 10 years.

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Liquidity and Capital Resources

Cash Flow. Cash flow provided from operating activities decreased to $620 million in 2018 from $711 million in 2017, primarily due to the timing of loss and loss expense payments, certain long-term incentive plan payments and payments to tax authorities.

The Company's insurance subsidiaries' principal sources of cash are premiums, investment income, service fees and proceeds from sales and maturities of portfolio investments. The principal uses of cash are payments for claims, taxes, operating expenses and dividends. The Company expects its insurance subsidiaries to fund the payment of losses with cash received from premiums, investment income and fees. The Company generally targets an average duration for its investment portfolio that is within one year of the average duration of its liabilities so that portions of its investment portfolio mature throughout the claim cycle and are available for the payment of claims if necessary. In the event operating cash flow and proceeds from maturities and prepayments of fixed income securities are not sufficient to fund claim payments and other cash requirements, the remainder of the Company's cash and investments is available to pay claims and other obligations as they become due. The Company's investment portfolio is highly liquid, with approximately 78% invested in cash, cash equivalents and marketable fixed maturity securities as of December 31, 2018. If the sale of fixed maturity securities were to become necessary, a realized gain or loss equal to the difference between the cost and sales price of securities sold would be recognized.

Debt. At December 31, 2018, the Company had senior notes, subordinated debentures and other debt outstanding with a carrying value of $2,790 million and a face amount of $2,826 million. The maturities of the outstanding debt are $447 million in 2019, $315 million in 2020, $427 million in 2022, $102 million in 2028, $250 million in 2037, $350 million in 2044, $350 million in 2053, $400 million in 2056 and $185 million in 2058.

In March 2018, the Company issued $175 million aggregate principal amount of 5.70% subordinated debentures due 2058, and in April 2018, the Company issued another $10 million principal amount of such debentures. Additionally in 2018, the Company issued subsidiary debt of $116 million, which was primarily attributable to a non-recourse mortgage loan on a real estate property in Florida.

Equity. The Company repurchased 357,600, 731,003 and 2,395,892 shares of its common stock in 2018, 2017 and 2016, respectively. The aggregate cost of the repurchases was $25 million in 2018, $48 million in 2017 and $132 million in 2016. In 2018, the Board declared regular quarterly cash dividends of $0.14 per share in first quarter, and $0.15 per share in each of the remaining three quarters, plus three additional special dividends of $0.50 per share each. At December 31, 2018, total common stockholders’ equity was $5.4 billion, common shares outstanding were 121,995,760 and stockholders’ equity per outstanding share was $44.57.

Total Capital. Total capitalization (equity, debt and subordinated debentures) was $8.2 billion at December 31, 2018. The percentage of the Company’s capital attributable to senior notes, subordinated debentures and other debt was 34% at December 31, 2018 and 32% at December 31, 2017.

Federal and Foreign Income Taxes

The Company files a consolidated income tax return in the U.S. and foreign tax returns in each of the countries in which it has overseas operations. At December 31, 2018, the Company had a gross deferred tax asset (net of valuation allowance) of $370 million (which primarily relates to loss and loss expense reserves and unearned premium reserves) and a gross deferred tax liability of $334 million (which primarily relates to deferred policy acquisition costs and investment funds). The realization of the deferred tax asset is dependent upon the Company's ability to generate sufficient taxable income in future periods. Based on historical results and the prospects for future operations, management anticipates that it is more likely than not that future taxable income will be sufficient for the realization of this asset.

50

Reinsurance

The Company follows customary industry practice of reinsuring a portion of its exposures in exchange for paying reinsurers a part of the premiums received on the policies it writes. Reinsurance is purchased by the Company principally to reduce its net liability on individual risks and to protect it against catastrophic losses. Although reinsurance does not legally discharge an insurer from its primary liability for the full amount of the policies, it does make the assuming reinsurer liable to the insurer to the extent of the reinsurance coverage. The Company monitors the financial condition of its reinsurers and attempts to place its coverages only with financially sound carriers. Reinsurance coverage and retentions vary depending on the line of business, location of the risk and nature of loss. The Company’s reinsurance purchases include the following:

• Property reinsurance treaties - The Company purchases property reinsurance to reduce its exposure to large individual property losses and catastrophe events. Following is a summary of significant property reinsurance treaties in effect as of January 1, 2019: The Company’s property per risk reinsurance generally covers losses between $2.5 million and $60 million. The Company’s catastrophe excess of loss reinsurance program provides protection for net losses between $15 million and $395 million for the majority of business written by its U.S. Insurance segment operating units and Lloyd's Syndicate, excluding offshore energy. The Company’s catastrophe reinsurance agreements are subject to certain limits, exclusions and reinstatement premiums.

• Casualty reinsurance treaties - The Company purchases casualty reinsurance to reduce its exposure to large individual casualty losses, workers’ compensation catastrophe losses and casualty losses involving multiple claimants or insureds for the majority of business written by its U.S. companies. A significant casualty treaty (casualty catastrophe) in effect as of January 1, 2019 provides protection for losses between $5 million and $75 million from single events with claims involving two or more insurable interests or for systemic events involving multiple insureds and/or policy years. The treaty also covers casualty contingency losses in excess of $1.5 million and up to $101.5 million. For losses involving two or more claimants for primary workers’ compensation business, coverage is generally in place for losses between $5 million and $270 million. For excess workers’ compensation business, such coverage is generally in place for losses between $25 million and $545 million.

• Facultative reinsurance - The Company also purchases facultative reinsurance on certain individual policies or risks that are in excess of treaty reinsurance capacity.

• Other reinsurance - Depending on the operating unit, the Company purchases specific additional reinsurance to supplement the above programs.

The Company places a number of its casualty treaties on a “risk attaching” basis. Under risk attaching treaties, all claims from policies incepting during the period of the reinsurance contract are covered even if they occur after the expiration date of the reinsurance contract. If the Company is unable to renew or replace its existing reinsurance coverage, protection for unexpired policies would remain in place until their expiration. In such case, the Company could revise its underwriting strategy for new business to reflect the absence of reinsurance protection. The casualty catastrophe treaty highlighted above was purchased on a claims made basis. Property catastrophe and workers’ compensation catastrophe reinsurance is generally placed on a “losses occurring basis,” whereby only claims occurring during the period are covered. If the Company is unable to renew or replace these reinsurance coverages, unexpired policies would not be protected, though we frequently have the option to purchase run-off coverage in our treaties.

Following is a summary of earned premiums and loss and loss expenses ceded to reinsurers for each of the three years ended December 31, 2018:

	Year Ended December 31,
(In thousands)	2018		2017		2016
Earned premiums	$	1,236,049	$	1,161,936	$	1,099,462
Losses and loss expenses	829,742		601,769		707,336

Ceded earned premiums increased 6.4% in 2018 to $1,236 million. The ceded losses and loss expenses ratio increased 15 points to 67% in 2018 from 52% in 2017.

51

The following table presents the credit quality of amounts due from reinsurers as of December 31, 2018. Amounts due from reinsurers are net of reserves for uncollectible reinsurance of $1 million in the aggregate.

(In thousands)
Reinsurer	Rating	(1)	Amount
Amounts due in excess of $20 million:
Lloyd’s of London	A+		$	215,370
Munich Re	AA-		164,131
Alleghany Group	A+		150,438
Swiss Re	AA-		150,280
Partner Re	A+		103,837
Berkshire Hathaway	AA+		87,314
Axis Capital	A+		85,377
Hannover Re Group	AA-		77,351
Everest Re	A+		62,113
Korean Re	A		52,746
Renaissance Re	A+		39,944
Liberty Mutual	A		32,118
Qatar Re	A		27,731
Chubb Limited	AA		24,628
Arch Capital Group	A+		21,260
Other reinsurers:
Rated A- or better			161,251
Secured (2)			109,143
All Others			18,911
Subtotal			1,583,943
Residual markets pools (3)			348,348
Total			$	1,932,291

_________________

(1) S&P rating, or if not rated by S&P, A.M. Best rating.

(2) Secured by letters of credit or other forms of collateral.

(3) Many states require licensed insurers that provide workers' compensation insurance to participate in programs that provide workers' compensation to employers that cannot procure coverage from an insurer on a voluntary basis. Insurers can fulfill this residual market obligation by participating in pools where results are shared by the participating companies. The Company acts as a servicing carrier for workers' compensation pools in certain states. As a servicing carrier, the Company writes residual market business directly and then cedes 100% of this business to the respective pool. As a servicing carrier, the Company receives fee income for its services. The Company does not retain underwriting risk, and credit risk is limited as ceded balances are jointly shared by all the pool members.

52

Contractual Obligations

Following is a summary of the Company's contractual obligations as of December 31, 2018:

(In thousands)
Estimated Payments By Periods	2019		2020		2021		2022		2023		Thereafter
Gross reserves for losses	$	3,137,565	$	2,154,391	$	1,609,899	$	1,161,065	$	848,536	$	3,637,803
Operating lease obligations	46,592		43,504		39,061		34,444		30,881		75,740
Purchase obligations	87,976		46,676		39,191		39,200		37,869		—
Subordinated debentures	—		—		—		—		—		935,000
Debt maturities	447,433		315,461		—		426,503		—		701,750
Interest payments	155,391		124,616		108,491		105,163		85,647		2,253,250
Other long-term liabilities	3,617		3,317		2,972		2,627		2,362		26,608
Total	$	3,878,574	$	2,687,965	$	1,799,614	$	1,769,002	$	1,005,295	$	7,630,151

The estimated payments for reserves for losses and loss expenses in the above table represent the projected (undiscounted) payments for gross loss and loss expense reserves related to losses incurred as of December 31, 2018. The estimated payments in the above table do not consider payments for losses to be incurred in future periods. These amounts include reserves for reported losses and reserves for incurred but not reported losses. Estimated amounts recoverable from reinsurers are not reflected. The estimated payments by year are based on historical loss payment patterns.The actual payments may differ from the estimated amounts due to changes in ultimate loss reserves and in the timing of the settlement of those reserves. In addition, at December 31, 2018, the Company had commitments to invest up to $270.2 million and $253.4 million in certain investment funds and real estate construction projects, respectively. These amounts are not included in the above table.

The Company utilizes letters of credit to back certain reinsurance payments and obligations. Outstanding letters of credit were $3 million as of December 31, 2018. The Company has made certain guarantees to state regulators that the statutory capital of certain subsidiaries will be maintained above certain minimum levels.

Off-Balance Sheet Arrangements

An off-balance sheet arrangement is any transaction, agreement or other contractual arrangement involving an unconsolidated entity under which a company has (1) made guarantees, (2) a retained or contingent interest in transferred assets, (3) an obligation under derivative instruments classified as equity or (4) any obligation arising out of a material variable interest in an unconsolidated entity that provides financing, liquidity, market risk or credit risk support to the Company, or that engages in leasing, hedging or research and development arrangements with the Company. The Company has no arrangements of these types that management believes may have a material current or future effect on our financial condition, liquidity or results of operations.

53

ITEM 7A. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Market Risk. The fair value of the Company’s investments is subject to risks of fluctuations in credit quality and interest rates. The Company uses various models and stress test scenarios to monitor and manage interest rate risk. The Company attempts to manage its interest rate risk by maintaining an appropriate relationship between the effective duration of the investment portfolio and the approximate duration of its liabilities (i.e., policy claims and debt obligations). The effective duration for the fixed maturity portfolio (including cash and cash equivalents) was 2.8 years and 3.0 years at December 31, 2018 and 2017, respectively.

In addition, the fair value of the Company’s international investments is subject to currency risk. The Company attempts to manage its currency risk by matching its foreign currency assets and liabilities where considered appropriate.

The following table outlines the groups of fixed maturity securities and their effective duration at December 31, 2018:

	Effective
	Duration
($ in thousands)	(Years)	Fair Value
State and municipal	3.7	$	3,952,038
Mortgage-backed securities	3.7	1,606,549
Corporate	3.4	4,111,311
U.S. government and government agencies	2.7	702,240
Foreign government	2.1	808,735
Loans receivable	1.0	97,073
Asset-backed securities	1.0	2,438,747
Cash and cash equivalents	—	817,602
Total	2.8	$	14,534,295

Duration is a common measure of the price sensitivity of fixed maturity securities to changes in interest rates. The Company determines the estimated change in fair value of the fixed maturity securities, assuming parallel shifts in

the yield curve for treasury securities while keeping spreads between individual securities and treasury securities static. The estimated fair value at specified levels at December 31, 2018 would be as follows:

(In thousands)	Estimated Fair Value		Change in Fair Value
Change in interest rates:
300 basis point rise	$	13,284,688	$	(1,249,608	)
200 basis point rise	13,689,482		(844,814		)
100 basis point rise	14,101,454		(432,842		)
Base scenario	14,534,295		—
100 basis point decline	14,912,897		378,601
200 basis point decline	15,291,638		757,342
300 basis point decline	15,449,791		915,495

Arbitrage investing differs from other types of investments in that its focus is on transactions and events believed likely to bring about a change in value over a relatively short time period (usually four months or less). The Company believes that this makes arbitrage investments less vulnerable to changes in general stock market conditions. Potential changes in market conditions are also mitigated by the implementation of hedging strategies, including short sales.

Additionally, the arbitrage positions are generally hedged against market declines by purchasing put options, selling call options or entering into swap contracts. The Company's merger arbitrage securities are primarily exposed to the risk of completion of announced deals, which are subject to regulatory as well as transactional and other risks.

54

ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

Report of Independent Registered Public Accounting Firm

To the Stockholders and Board of Directors

W. R. Berkley Corporation:

Opinion on the Consolidated Financial Statements

We have audited the accompanying consolidated balance sheets of W. R. Berkley Corporation and Subsidiaries (the “Company”) as of December 31, 2018 and 2017, the related consolidated statements of income, comprehensive income, stockholders’ equity, and cash flows for each of the years in the three‑year period ended December 31, 2018, and the related notes and financial statement schedules II to VI (collectively, the “consolidated financial statements”). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2018 and 2017, and the results of its operations and its cash flows for each of the years in the three‑year period ended December 31, 2018, in conformity with U.S. generally accepted accounting principles.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (“PCAOB”), the Company’s internal control over financial reporting as of December 31, 2018, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission, and our report dated February 22, 2019 expressed an unqualified opinion on the effectiveness of the Company’s internal control over financial reporting.

Change in Accounting Principle

As discussed in Note 1 to the consolidated financial statements, the Company has changed its method of accounting for equity investments measured at fair value with changes in the fair value recognized through net income (other than those accounted for under equity method of accounting or those that result in consolidation of the investee) effective January 1, 2018 due to the adoption of ASU 2016-01, Financial Instruments.

Basis for Opinion

These consolidated financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on these consolidated financial statements based on our audits. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the consolidated financial statements are free of material misstatement, whether due to error or fraud. Our audits included performing procedures to assess the risks of material misstatement of the consolidated financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the consolidated financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the consolidated financial statements. We believe that our audits provide a reasonable basis for our opinion.

/S/ KPMG LLP

We have served as the Company’s auditor since 1972.

New York, New York

February 22, 2019

55

W. R. BERKLEY CORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF INCOME

	Year Ended December 31,
(In thousands, except per share data)	2018			2017			2016
REVENUES:
Net premiums written	$	6,433,227		$	6,260,508		$	6,423,913
Change in net unearned premiums	(61,722		)	50,911			(130,565		)
Net premiums earned	6,371,505			6,311,419			6,293,348
Net investment income	674,235			575,788			564,163
Net realized and unrealized gains on investments:
Net realized and unrealized gains before OTTI	160,175			335,858			285,119
Other-than-temporary impairments ("OTTI")	(5,687		)	—			(18,114		)
Net realized and unrealized gains on investments	154,488			335,858			267,005
Revenues from non-insurance businesses	372,985			326,165			390,348
Insurance service fees	117,757			134,729			138,944
Other income	681			805			376
Total revenues	7,691,651			7,684,764			7,654,184
OPERATING COSTS AND EXPENSES:
Losses and loss expenses	3,974,702			4,002,348			3,845,800
Other operating costs and expenses	2,383,221			2,436,932			2,395,619
Expenses from non-insurance businesses	364,449			325,417			375,431
Interest expense	157,185			147,297			140,896
Total operating costs and expenses	6,879,557			6,911,994			6,757,746
Income before income taxes	812,094			772,770			896,438
Income tax expense	(163,028		)	(219,433		)	(292,953		)
Net income before noncontrolling interests	649,066			553,337			603,485
Noncontrolling interests	(8,317		)	(4,243		)	(1,569		)
Net income to common stockholders	$	640,749		$	549,094		$	601,916
NET INCOME PER SHARE:
Basic	$	5.06		$	4.40		$	4.91
Diluted	$	5.00		$	4.26		$	4.68

See accompanying notes to consolidated financial statements.

56

W. R. BERKLEY CORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

	Year Ended December 31,
(In thousands)	2018			2017			2016
Net income before noncontrolling interests	$	649,066		$	553,337		$	603,485
Other comprehensive (loss) gain:
Change in unrealized translation adjustments	(112,099		)	64,706			(124,193		)
Change in unrealized investment (losses) gains, net of taxes	(252,327		)	(51,752		)	246,518
Other comprehensive (loss) gain	(364,426		)	12,954			122,325
Comprehensive income	284,640			566,291			725,810
Comprehensive income to the noncontrolling interest	(8,271		)	(4,262		)	(1,510		)
Comprehensive income to common stockholders	$	276,369		$	562,029		$	724,300

See accompanying notes to consolidated financial statements.

57

W. R. BERKLEY CORPORATION AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

	December 31,
(In thousands, except share data)	2018			2017
Assets
Investments:
Fixed maturity securities	$	13,606,812		$	13,551,250
Investment funds	1,332,818			1,155,677
Real estate	1,957,092			1,469,601
Arbitrage trading account	452,548			617,649
Equity securities	279,006			576,647
Loans receivable	94,813			79,684
Total investments	17,723,089			17,450,508
Cash and cash equivalents	817,602			950,471
Premiums and fees receivable	1,807,762			1,773,844
Due from reinsurers	1,932,291			1,783,200
Deferred policy acquisition costs	497,629			507,549
Prepaid reinsurance premiums	498,880			472,009
Trading account receivable from brokers and clearing organizations	347,228			189,280
Property, furniture and equipment	416,372			422,960
Goodwill	173,037			178,945
Accrued investment income	144,481			136,597
Current federal and foreign income taxes	703			—
Deferred federal and foreign income taxes	35,490			—
Other assets	501,413			434,554
Total assets	$	24,895,977		$	24,299,917
Liabilities and Equity
Liabilities:
Reserves for losses and loss expenses	$	11,966,448		$	11,670,408
Unearned premiums	3,359,991			3,290,180
Due to reinsurers	256,917			246,460
Trading account securities sold but not yet purchased	38,120			64,358
Current federal and foreign income taxes	—			11,327
Deferred federal and foreign income taxes	—			86,764
Other liabilities	1,005,184			981,987
Senior notes and other debt	1,882,028			1,769,052
Subordinated debentures	907,491			728,218
Total liabilities	19,416,179			18,848,754
Equity:
Preferred stock, par value $.10 per share:
Authorized 5,000,000 shares; issued and outstanding — none	—			—
Common stock, par value $.20 per share:
Authorized 500,000,000 shares, issued and outstanding, net of treasury shares, 121,995,760 and 121,514,852 shares, respectively	47,024			47,024
Additional paid-in capital	1,063,144			1,048,283
Retained earnings	7,558,619			6,956,882
Accumulated other comprehensive (loss) income	(510,470		)	68,541
Treasury stock, at cost, 113,122,158 and 113,603,066 shares, respectively	(2,720,466		)	(2,709,386		)
Total common stockholders’ equity	5,437,851			5,411,344
Noncontrolling interests	41,947			39,819
Total equity	5,479,798			5,451,163
Total liabilities and equity	$	24,895,977		$	24,299,917

See accompanying notes to consolidated financial statements.

58

W. R. BERKLEY CORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY

	Year Ended December 31,
(In thousands)	2018			2017			2016
COMMON STOCK:
Beginning and end of period	$	47,024		$	47,024		$	47,024
ADDITIONAL PAID IN CAPITAL:
Beginning of period	$	1,048,283		$	1,037,446		$	1,005,455
Restricted stock units issued	(19,547		)	(27,959		)	(3,594		)
Restricted stock units expensed	34,408			38,796			35,585
End of period	$	1,063,144		$	1,048,283		$	1,037,446
RETAINED EARNINGS:
Beginning of period	$	6,956,882		$	6,595,987		$	6,178,070
Cumulative effect adjustment resulting from changes in accounting principles	215,939			—			—
Net income to common stockholders	640,749			549,094			601,916
Dividends	(254,951		)	(188,199		)	(183,999		)
End of period	$	7,558,619		$	6,956,882		$	6,595,987
ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME:
Unrealized investment (losses) gains:
Beginning of period	$	375,421		$	427,154		$	180,695
Cumulative effect adjustment resulting from changes in accounting principles	(214,539		)	—			—
Unrealized (losses) gains on securities not other-than-temporarily impaired	(252,241		)	(52,628		)	246,872
Unrealized (losses) gains on other-than-temporarily impaired securities	(132		)	895			(413		)
End of period	(91,491		)	375,421			427,154
Currency translation adjustments:
Beginning of period	(306,880		)	(371,586		)	(247,393		)
Net change in period	(112,099		)	64,706			(124,193		)
End of period	(418,979		)	(306,880		)	(371,586		)
Total accumulated other comprehensive (loss) income	$	(510,470	)	$	68,541		$	55,568
TREASURY STOCK:
Beginning of period	$	(2,709,386	)	$	(2,688,817	)	$	(2,563,605	)
Stock exercised/vested	12,981			26,511			6,495
Stock issued	689			727			685
Stock repurchased	(24,750		)	(47,807		)	(132,392		)
End of period	$	(2,720,466	)	$	(2,709,386	)	$	(2,688,817	)
NONCONTROLLING INTERESTS:
Beginning of period	$	39,819		$	33,926		$	32,962
(Distributions) contributions	(6,143		)	1,631			(546		)
Net income	8,317			4,243			1,569
Other comprehensive (loss) income, net of tax	(46		)	19			(59		)
End of period	$	41,947		$	39,819		$	33,926

See accompanying notes to consolidated financial statements.

59

W. R. BERKLEY CORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS

	Year Ended December 31,
(In thousands)	2018			2017			2016
CASH FROM OPERATING ACTIVITIES:
Net income to common stockholders	$	640,749		$	549,094		$	601,916
Adjustments to reconcile net income to net cash from operating activities:
Net realized and unrealized gains on investments	(154,488		)	(335,858		)	(267,005		)
Depreciation and amortization	131,108			112,956			86,051
Noncontrolling interests	8,317			4,243			1,569
Investment funds	(109,349		)	(69,333		)	(99,301		)
Stock incentive plans	36,591			40,490			37,174
Change in:
Arbitrage trading account	(19,093		)	(4,896		)	(10,633		)
Premiums and fees receivable	(43,813		)	(67,752		)	(60,403		)
Reinsurance accounts	(165,287		)	(66,542		)	(235,455		)
Deferred policy acquisition costs	7,788			30,343			(25,912		)
Current income taxes	(11,950		)	25,859			42,632
Deferred income taxes	(74,761		)	(16,893		)	9,012
Reserves for losses and loss expenses	339,015			438,530			572,196
Unearned premiums	84,142			4,160			149,683
Other	(48,770		)	66,482			46,852
Net cash from operating activities	620,199			710,883			848,376
CASH FLOWS USED IN INVESTING ACTIVITIES:
Proceeds from sale of fixed maturity securities	3,525,149			4,035,162			2,440,310
Proceeds from sale of equity securities	497,989			195,270			143,042
(Contributions) distributions from investment funds	(79,635		)	247,404			142,601
Proceeds from maturities and prepayments of fixed maturity securities	2,676,455			3,556,744			2,189,365
Purchase of fixed maturity securities	(6,677,753		)	(7,940,957		)	(5,541,202		)
Purchase of equity securities	(85,610		)	(27,522		)	(202,736		)
Real estate purchased	(514,064		)	(236,039		)	(299,123		)
Change in loans receivable	(13,204		)	27,135			166,327
Net additions to property, furniture and equipment	(49,860		)	(115,719		)	(50,829		)
Change in balances due from security brokers	4,262			(4,372		)	20,992
Cash received in connection with business disposition	8,664			—			250,216
Payment for business purchased, net of cash acquired	(6,637		)	(70,570		)	(53,451		)
Net cash used in investing activities	(714,244		)	(333,464		)	(794,488		)
CASH FLOWS USED IN FINANCING ACTIVITIES:
Net proceeds from issuance of debt	294,562			6,983			388,769
Repayment of senior notes and other debt	(4,524		)	(20		)	(75,487		)
Cash dividends to common stockholders	(254,951		)	(188,199		)	(183,999		)
Purchase of common treasury shares	(24,750		)	(47,807		)	(132,392		)
Other, net	(17,740		)	(6,043		)	(3,823		)
Net cash used in financing activities	(7,403		)	(235,086		)	(6,932		)
Net impact on cash due to change in foreign exchange rates	(31,421		)	12,853			(15,302		)
Net (decrease) increase in cash and cash equivalents	(132,869		)	155,186			31,654
Cash and cash equivalents at beginning of year	950,471			795,285			763,631
Cash and cash equivalents at end of year	$	817,602		$	950,471		$	795,285

See accompanying notes to consolidated financial statements.

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W. R. BERKLEY CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

For the years ended December 31, 2018, 2017 and 2016

(1) Summary of Significant Accounting Policies

(A) Principles of consolidation and basis of presentation

The consolidated financial statements, which include the accounts of W. R. Berkley Corporation and its subsidiaries (the "Company"), have been prepared on the basis of U.S. generally accepted accounting principles ("GAAP"). All significant intercompany transactions and balances have been eliminated. Reclassifications have been made in the 2017 and 2016 financial statements to conform to the presentation of the 2018 financial statements. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the revenues and expenses reflected during the reporting period. The most significant items on our balance sheet that involve a greater degree of accounting estimates that are subject to change in the future are the valuation of investments, other-than-temporary impairments, loss and loss expense reserves and premium estimates. Actual results could differ from those estimates.

(B) Revenue recognition

Insurance premiums are recognized as written at the inception of the policy. Reinsurance premiums are estimated based upon information received from ceding companies, and subsequent differences from such estimates are recorded in the period they are determined. Insurance and reinsurance premiums are primarily earned on a pro rata basis over the policy term. Fees for services are earned over the period that the services are provided.

Audit premiums are recognized when they are reliably determinable. The change in accruals for earned but unbilled audit premiums (decreased) increased net premiums written and premiums earned by $(4) million, $8 million and $8 million in 2018, 2017 and 2016, respectively.

Revenues from non-insurance businesses are derived from businesses engaged in the distribution of promotional merchandise, world-wide textile solutions, and aircraft services provided to the general, commercial and military aviation markets. These aircraft services include (i) the distribution, manufacturing, repair and overhaul of aircraft parts and components, (ii) the sale of new and used aircraft, and (iii) avionics, fuel, maintenance, storage and charter services. Revenue is recognized upon the shipment of products and parts, the delivery of aircraft, the delivery of fuel, and over the completion period of services.

Insurance service fee revenue represents servicing fees for program administration and claims management services provided by the Company, including workers' compensation assigned risk plans, as well as insurance brokerage and risk management services. Fees for program administration, claims management and risk management services are primarily recognized ratably over the related contract period for which the underlying services are rendered. Commissions for insurance brokerage are generally recognized when the underlying insurance policy is effective.

(C) Cash and cash equivalents

Cash equivalents consist of funds invested in money market accounts and investments with an effective maturity of three months or less when purchased.

(D) Investments

Fixed maturity securities classified as available for sale are carried at estimated fair value, with unrealized gains and losses, net of applicable income taxes, excluded from earnings and reported as a component of comprehensive income and a separate component of stockholders' equity. Fixed maturity securities that the Company has the positive intent and ability to hold to maturity are classified as held to maturity and reported at amortized cost. Investment income from fixed maturity securities is recognized based on the constant effective yield method. Premiums and discounts on mortgage-backed securities are adjusted for the effects of actual and anticipated prepayments on a retrospective basis.

Equity securities with readily determinable fair values are measured at fair value, with changes in the fair value recognized in net income within net realized and unrealized gains on investments. (See (Q) Recent accounting pronouncements.)

Fixed maturity securities that the Company purchased with the intent to sell in the near-term are classified as trading account securities and are reported at estimated fair value. Realized and unrealized gains and losses from trading activity are reported as net investment income and are recorded at the trade date. Short sales and short call options are presented as trading

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securities sold but not yet purchased. Unsettled trades and the net margin balances held by the clearing broker are presented as a trading account receivable from brokers and clearing organizations.

Investment funds are carried under the equity method of accounting. The Company's share of the earnings or losses of investment funds is primarily reported on a one-quarter lag in order to facilitate the timely completion of the Company's consolidated financial statements.

Loans receivable primarily represent commercial real estate mortgage loans and bank loans and are carried at amortized cost. The Company monitors the performance of its loans receivable and establishes an allowance for loan losses for loans where the Company determines it is probable that the contractual terms will not be met, with a corresponding charge to earnings. For loans that are evaluated individually and deemed to be impaired, the Company establishes a specific allowance based on a discounted cash flow analysis and comparable cost and sales methodologies, if appropriate. Individual loans that are not considered impaired and smaller-balance homogeneous loans are evaluated collectively and a general allowance is established if it is considered probable that a loss has been incurred.

The accrual of interest on loans receivable is discontinued if the loan is 90 days past due based on the contractual terms of the loan unless the loan is adequately secured and in process of collection. In general, loans are placed on non-accrual status or charged off at an earlier date if collection of principal or interest is considered doubtful. Interest on these loans is accounted for on a cash basis until qualifying for return to accrual status. Loans are returned to accrual status when all principal and interest amounts contractually due are brought current and future payments are reasonably assured.

Fair value is defined as “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.” Fair value of investments is determined based on a fair value hierarchy that prioritizes the use of observable inputs over the use of unobservable inputs and requires the use of observable inputs when available. (See Note 12 of the Notes to Consolidated Financial Statements.)

Realized gains or losses represent the difference between the cost of securities sold and the proceeds realized upon sale and are recorded at the trade date. The Company uses primarily the first-in, first-out method to determine the cost of securities sold.

The cost of securities is adjusted where appropriate to include a provision for a decline in value which is considered to be other than temporary. An other-than-temporary decline is considered to occur in investments where there has been a sustained reduction in fair value and where the Company does not expect to recover the cost basis of the investment prior to the time of sale or maturity.

For fixed maturity securities that the Company intends to sell or, more likely than not, would be required to sell, a decline in value below amortized cost is considered to be an other-than-temporary impairment (“OTTI”). The amount of OTTI is equal to the difference between amortized cost and fair value at the balance sheet date. For fixed maturity securities that the Company does not intend to sell or believes that it is more likely than not it would not be required to sell, a decline in value below amortized cost is considered to be an OTTI if the Company does not expect to recover the entire amortized cost basis of a security (i.e., the present value of cash flows expected to be collected is less than the amortized cost basis of the security). The portion of the decline in value considered to be a credit loss (i.e., the difference between the present value of cash flows expected to be collected and the amortized cost basis of the security) is recognized in earnings. The portion of the decline in value not considered to be a credit loss (i.e., the difference in the present value of cash flows expected to be collected and the fair value of the security) is recognized in other comprehensive income.

Impairment assessments for structured securities, including mortgage-backed securities and asset-backed securities, collateralized debt obligations and corporate debt, are generally evaluated based on the performance of the underlying collateral under various economic and default scenarios that may involve subjective judgments and estimates by management. Modeling these securities involves various factors, such as projected default rates, the nature and realizable value of the collateral, if any, the ability of the issuer to make scheduled payments, historical performance and other relevant economic and performance factors. If an OTTI determination is made, a discounted cash flow analysis is used to ascertain the amount of the credit impairment.

Real estate held for investment purposes is initially recorded at the purchase price, which is generally fair value, and is subsequently reported at cost less accumulated depreciation. Real estate taxes, interest and other costs incurred during development and construction are capitalized. Buildings are depreciated on a straight-line basis over the estimated useful lives of the building. Minimum rental income is recognized on a straight-line basis over the lease term. Income and expenses from real estate are reported as net investment income. The carrying value of real estate is reviewed for impairment and an impairment loss is recognized if the estimated undiscounted cash flows from the use and disposition of the property are less than the carrying value of the property.

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(E) Per share data

The Company presents both basic and diluted net income per share (“EPS”) amounts. Basic EPS is calculated by dividing net income by weighted average number of common shares outstanding during the year (including 4,926,521 common shares held in a grantor trust). The common shares held in the grantor trust are for delivery upon settlement of vested but mandatorily deferred restricted stock units ("RSUs"). Shares held by the grantor trust do not affect diluted shares outstanding since the shares deliverable under vested RSUs were already included in diluted shares outstanding. Diluted EPS is based upon the weighted average number of basic and common equivalent shares outstanding during the year and is calculated using the treasury stock method for stock incentive plans. Common equivalent shares are excluded from the computation in periods in which they have an anti-dilutive effect.

(F) Deferred policy acquisition costs

Acquisition costs associated with the successful acquisition of new and renewed insurance and reinsurance contracts are deferred and amortized ratably over the terms of the related contracts. Ceding commissions received on reinsurance contracts are netted against acquisition costs and are recognized ratably over the life of the contract. Deferred policy acquisition costs are presented net of unearned ceding commissions. Deferred policy acquisition costs are comprised primarily of commissions, as well as employment-related underwriting costs and premium taxes. Deferred policy acquisition costs are reviewed to determine if they are recoverable from future income and, if not, are charged to expense. The recoverability of deferred policy acquisition costs is evaluated separately by each of our operating companies. Future investment income is taken into account in measuring the recoverability of deferred policy acquisition costs.

(G) Reserves for losses and loss expenses

Reserves for losses and loss expenses are an accumulation of amounts determined on the basis of (1) evaluation of claims for business written directly by the Company; (2) estimates received from other companies for reinsurance assumed by the Company; and (3) estimates for losses incurred but not reported (based on Company and industry experience). These estimates are periodically reviewed and, as experience develops and new information becomes known, the reserves are adjusted as necessary. Such adjustments are reflected in the statements of income in the period in which they are determined. The Company discounts its reserves for excess and assumed workers' compensation claims using a risk-free or statutory rate. (See Note 13 of Notes to Consolidated Financial Statements.)

(H) Reinsurance ceded

The unearned portion of premiums ceded to reinsurers is reported as prepaid reinsurance premiums and earned ratably over the policy term. The estimated amounts of reinsurance recoverable on unpaid losses are reported as due from reinsurers. To the extent any reinsurer does not meet its obligations under reinsurance agreements, the Company must discharge its liability. Amounts due from reinsurers are reflected net of funds held where the right of offset is present. The Company has provided reserves for estimated uncollectible reinsurance.

(I) Deposit accounting

Contracts that do not meet the risk transfer requirements of GAAP are accounted for using the deposit accounting method. Under this method, an asset or liability is recognized at the inception of the contract based on consideration paid or received. The amount of the deposit asset or liability is adjusted at subsequent reporting dates using the interest method with a corresponding credit or charge to interest income or expense. Deposit liabilities for assumed reinsurance contracts were $45 million and $47 million at December 31, 2018 and 2017, respectively.

(J) Federal and foreign income taxes

The Company files a consolidated income tax return in the U.S. and foreign tax returns in countries where it has overseas operations. The Company's method of accounting for income taxes is the asset and liability method. Under this method, deferred tax assets and liabilities are measured using tax rates currently in effect or expected to apply in the years in which those temporary differences are expected to reverse. Interest and penalties, if any, are reported as income tax expense. The Company believes there are no tax positions that would require disclosure under GAAP. Deferred tax assets are reduced by a valuation allowance if it is more likely than not that all or a portion of the deferred tax assets will not be realized.

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(K) Foreign currency

Gains and losses resulting from foreign currency transactions (transactions denominated in a currency other than the entity's functional currency) are reported on the statements of income as other operating costs and expenses. Unrealized gains or losses resulting from translating the results of non-U.S. dollar denominated operations are reported in accumulated other comprehensive income. Revenues and expenses denominated in currencies other than U.S. dollars are generally translated at the weighted average exchange rate during the year. Assets and liabilities are translated at the rate of exchange in effect at the balance sheet date.

(L) Property, furniture and equipment

Property, furniture and equipment are carried at cost less accumulated depreciation. Depreciation is calculated using the estimated useful lives of the respective assets. Depreciation expense was $54 million, $50 million and $47 million for 2018, 2017 and 2016, respectively.

(M) Comprehensive income

Comprehensive income encompasses all changes in stockholders' equity (except those arising from transactions with stockholders) and includes net income, net unrealized holding gains or losses on available for sale securities and unrealized foreign currency translation adjustments.

(N) Goodwill and other intangible assets

Goodwill and other intangible assets are tested for impairment on an annual basis and at interim periods where circumstances require. The Company's impairment test as of December 31, 2018 indicated that there were no material impairment losses related to goodwill and other intangible assets. Intangible assets of $104 million and $107 million are included in other assets as of December 31, 2018 and 2017, respectively.

(O) Restricted stock units

The costs resulting from all share-based payment transactions with employees are recognized in the consolidated financial statements using a fair-value-based measurement method. Compensation cost is recognized for financial reporting purposes over the period in which the employee is required to provide service in exchange for the award (generally the vesting period).

(P) Statements of cash flows

Interest payments were $155 million, $145 million and $137 million in 2018, 2017 and 2016, respectively. Income taxes paid were $186 million, $207 million and $232 million in 2018, 2017 and 2016, respectively. Other non-cash items include unrealized investment gains and losses. (See Note 10 of Notes to Consolidated Financial Statements.)

(Q) Recent accounting pronouncements

Recently adopted accounting pronouncements:

In May 2014, the Financial Accounting Standards Board ("FASB") issued ASU 2014-09, Revenue from Customers. ASU 2014-09 clarifies the principles for recognizing revenue. While insurance contracts are not within the scope of this updated guidance, the Company’s insurance service fee revenue and non-insurance business revenue are subject to this updated guidance. The updated guidance requires an entity to recognize revenue as performance obligations are met, in order to reflect the transfer of promised goods or services to customers in an amount that reflects the consideration the entity is entitled to receive for those goods or services. The updated guidance, as amended by ASU 2015-14, was effective for public business entities for annual and interim reporting periods beginning after December 15, 2017. The Company adopted this guidance on January 1, 2018 on a prospective basis. The impact of applying this guidance prospectively was a cumulative effect adjustment that increased retained earnings, a component of stockholders' equity, by $1 million after-tax.

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In January 2016, the FASB issued ASU 2016-01, Financial Instruments.  ASU 2016-01 amends the accounting guidance for financial instruments to require all equity investments with readily determinable fair values to be measured at fair value with changes in the fair value recognized in net income (other than those accounted for under equity method of accounting or those that result in consolidation of the investee).  The updated guidance was effective for public business entities for annual reporting periods beginning after December 15, 2017 and interim periods within those years. The Company adopted this updated guidance on January 1, 2018 on a prospective basis. The impact of applying this guidance prospectively was a cumulative effect adjustment that increased retained earnings and decreased accumulated other comprehensive income ("AOCI") by offsetting amounts of $291 million, resulting in no net impact to total stockholders' equity. Following the adoption, the Company reports changes in fair value related to equity securities within net realized and unrealized gains on investments.

In February 2018, the FASB issued ASU 2018-02, Reporting Comprehensive Income, which amends previous guidance to allow a reclassification to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act of 2017 (the “Tax Act”). The amount of the reclassification includes the effect of the change in the U.S. federal corporate income tax rate on the gross deferred tax amounts and related valuation allowances, if any, at the date of the enactment of the Tax Act related to items in AOCI. The updated guidance was effective for reporting periods beginning after December 15, 2018, and was eligible for early adoption. The Company adopted this updated guidance on January 1, 2018. The impact of applying this guidance was a cumulative effect adjustment that decreased retained earnings and increased AOCI by offsetting amounts of $76 million, resulting in no net impact to total stockholders' equity.

All other accounting and reporting standards that became effective in 2018 were either not applicable to the Company or their adoption did not have a material impact on the Company. 

Accounting and reporting standards that are not yet effective:

In February 2016, the FASB issued ASU 2016-02, Leases, which amends the accounting and disclosure guidance for leases.  This guidance retains the two classifications of a lease, as either an operating or finance lease, both of which will require lessees to recognize a right-of-use asset and a lease liability for leases with terms of more than 12 months. The right-of-use asset and the lease liability will be determined based upon the present value of cash flows. Finance leases will reflect the financial arrangement by recognizing interest expense on the lease liability separately from the amortization expense of the right-of-use asset. Operating leases will recognize lease expense (with no separate recognition of interest expense) on a straight-line basis over the term of the lease. The accounting by lessors is not significantly changed by the updated guidance.  The updated guidance is effective for reporting periods beginning after December 15, 2018, and can be adopted prospectively or requires that the earliest comparative period presented include the measurement and recognition of existing leases with an adjustment to equity as if the updated guidance had always been applied. The Company will adopt the new guidance prospectively as of January 1, 2019. The Company does not expect the adoption of this guidance will have a material impact on its results of operations, financial position and liquidity. The adoption of this guidance will result in the recognition of an offsetting right-of-use asset and lease liability which will be less than 1% of total assets and approximately 1% of total liabilities.

In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses, which amends the accounting guidance for credit losses on financial instruments. The updated guidance amends the current other-than-temporary impairment model for available-for-sale debt securities by requiring the recognition of impairments relating to credit losses through an allowance account and limits the amount of credit loss to the difference between a security’s amortized cost basis and its fair value. This guidance also applies a new current expected credit loss model for determining credit-related impairments for financial instruments measured at amortized cost. The updated guidance is effective for reporting periods beginning after December 15, 2019. The Company will not be able to determine the impact the adoption of this guidance will have on its results of operations, financial position or liquidity until the year the guidance becomes effective.

All other recently issued but not yet effective accounting and reporting standards are either not applicable to the Company or are not expected to have a material impact on the Company.

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(2)    Consolidated Statement of Comprehensive (Loss) Income

The following tables present the components of the changes in accumulated other comprehensive (loss) income ("AOCI") as of and for the years ended December 31, 2018 and 2017:

(In thousands)
December 31, 2018	Unrealized investment (losses) gains				Currency translation adjustments			Accumulated other comprehensive (loss) income
Changes in AOCI
Beginning of period	$	375,421			$	(306,880	)	$	68,541
Cumulative effect adjustment resulting from changes in accounting principles	(214,539		)		—			(214,539		)
Restated beginning of period	160,882				(306,880		)	(145,998		)
Other comprehensive loss before reclassifications	(246,535		)		(112,099		)	(358,634		)
Amounts reclassified from AOCI	(5,792		)		—			(5,792		)
Other comprehensive loss	(252,327		)		(112,099		)	(364,426		)
Unrealized investment loss related to non-controlling interest	(46		)		—			(46		)
Ending balance	$	(91,491	)		$	(418,979	)	$	(510,470	)
Amounts reclassified from AOCI
Pre-tax	$	(7,332	)	(1)	$	—		$	(7,332	)
Tax effect	1,540			(2)	—			1,540
After-tax amounts reclassified	$	(5,792	)		$	—		$	(5,792	)
Other comprehensive loss
Pre-tax	$	(302,737	)		$	(112,099	)	$	(414,836	)
Tax effect	50,410				—			50,410
Other comprehensive loss	$	(252,327	)		$	(112,099	)	$	(364,426	)

(In thousands)
December 31, 2017	Unrealized investment gains (losses)				Currency translation adjustments			Accumulated other comprehensive income (loss)
Changes in AOCI
Beginning of period	$	427,154			$	(371,586	)	$	55,568
Other comprehensive income before reclassifications	63,567				64,706			128,273
Amounts reclassified from AOCI	(115,319		)		—			(115,319		)
Other comprehensive (loss) income	(51,752		)		64,706			12,954
Unrealized investment gain related to non-controlling interest	19				—			19
Ending balance	$	375,421			$	(306,880	)	$	68,541
Amounts reclassified from AOCI
Pre-tax	$	(177,414	)	(1)	$	—		$	(177,414	)
Tax effect	62,095			(2)	—			62,095
After-tax amounts reclassified	$	(115,319	)		$	—		$	(115,319	)
Other comprehensive income (loss)
Pre-tax	$	(69,425	)		$	64,706		$	(4,719	)
Tax effect	17,673				—			17,673
Other comprehensive income (loss)	$	(51,752	)		$	64,706		$	12,954

_______________

(1) Net realized and unrealized gains on investments in the consolidated statements of income.

(2) Income tax expense in the consolidated statements of income.

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(3)    Investments in Fixed Maturity Securities

At December 31, 2018 and 2017, investments in fixed maturity securities were as follows:

(In thousands)	Amortized Cost		Gross Unrealized					Fair Value		Carrying Value
			Gains		Losses
December 31, 2018
Held to maturity:
State and municipal	$	67,891	$	11,549	$	—		$	79,440	$	67,891
Residential mortgage-backed	10,744		1,259		—			12,003		10,744
Total held to maturity	78,635		12,808		—			91,443		78,635
Available for sale:
U.S. government and government agency	697,931		9,219		(4,910		)	702,240		702,240
State and municipal:
Special revenue	2,396,089		30,507		(19,790		)	2,406,806		2,406,806
State general obligation	335,626		11,951		(1,103		)	346,474		346,474
Pre-refunded	408,141		16,568		(30		)	424,679		424,679
Corporate backed	272,440		4,319		(2,350		)	274,409		274,409
Local general obligation	403,219		18,350		(1,339		)	420,230		420,230
Total state and municipal	3,815,515		81,695		(24,612		)	3,872,598		3,872,598
Mortgage-backed securities:
Residential (1)	1,264,376		7,729		(20,225		)	1,251,880		1,251,880
Commercial	345,070		1,304		(3,708		)	342,666		342,666
Total mortgage-backed securities	1,609,446		9,033		(23,933		)	1,594,546		1,594,546
Asset-backed securities	2,462,303		10,131		(33,687		)	2,438,747		2,438,747
Corporate:
Industrial	2,295,778		15,355		(53,312		)	2,257,821		2,257,821
Financial	1,502,427		7,178		(45,683		)	1,463,922		1,463,922
Utilities	330,326		2,997		(4,148		)	329,175		329,175
Other	60,238		322		(167		)	60,393		60,393
Total corporate	4,188,769		25,852		(103,310		)	4,111,311		4,111,311
Foreign government	822,093		11,753		(25,111		)	808,735		808,735
Total available for sale	13,596,057		147,683		(215,563		)	13,528,177		13,528,177
Total investments in fixed maturity securities	$	13,674,692	$	160,491	$	(215,563	)	$	13,619,620	$	13,606,812

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(In thousands)	Amortized Cost		Gross Unrealized					Fair Value		Carrying Value
			Gains		Losses
December 31, 2017
Held to maturity:
State and municipal	$	65,882	$	14,499	$	—		$	80,381	$	65,882
Residential mortgage-backed	13,450		1,227		—			14,677		13,450
Total held to maturity	79,332		15,726		—			95,058		79,332
Available for sale:
U.S. government and government agency	372,748		8,824		(3,832		)	377,740		377,740
State and municipal:
Special revenue	2,663,245		53,512		(10,027		)	2,706,730		2,706,730
State general obligation	439,358		16,087		(711		)	454,734		454,734
Pre-refunded	436,241		22,701		(9		)	458,933		458,933
Corporate backed	375,268		10,059		(860		)	384,467		384,467
Local general obligation	417,955		23,242		(967		)	440,230		440,230
Total state and municipal	4,332,067		125,601		(12,574		)	4,445,094		4,445,094
Mortgage-backed securities:
Residential (1)	1,043,629		9,304		(13,547		)	1,039,386		1,039,386
Commercial	261,652		1,521		(2,628		)	260,545		260,545
Total mortgage-backed securities	1,305,281		10,825		(16,175		)	1,299,931		1,299,931
Asset-backed securities	2,111,132		11,024		(10,612		)	2,111,544		2,111,544
Corporate:
Industrial	2,574,400		52,210		(7,718		)	2,618,892		2,618,892
Financial	1,402,161		37,744		(5,138		)	1,434,767		1,434,767
Utilities	284,886		11,316		(1,248		)	294,954		294,954
Other	40,560		5		(66		)	40,499		40,499
Total corporate	4,302,007		101,275		(14,170		)	4,389,112		4,389,112
Foreign government	819,345		32,018		(2,866		)	848,497		848,497
Total available for sale	13,242,580		289,567		(60,229		)	13,471,918		13,471,918
Total investments in fixed maturity securities	$	13,321,912	$	305,293	$	(60,229	)	$	13,566,976	$	13,551,250

____________________

(1) Gross unrealized (losses) gains for mortgage-backed securities include ($55,090) and $76,467 as of December 31, 2018 and 2017, respectively, related to the non-credit portion of OTTI recognized in other comprehensive income.

The amortized cost and fair value of fixed maturity securities at December 31, 2018, by contractual maturity, are shown below. Actual maturities may differ from contractual maturities because certain issuers may have the right to call or prepay obligations.

(In thousands)	Amortized Cost		Fair Value
Due in one year or less	$	935,354	$	935,894
Due after one year through five years	4,666,934		4,669,502
Due after five years through ten years	3,037,450		3,045,868
Due after ten years	3,414,764		3,361,807
Mortgage-backed securities	1,620,190		1,606,549
Total	$	13,674,692	$	13,619,620

At December 31, 2018 and 2017, there were no investments, other than investments in United States government and government agency securities, which exceeded 10% of common stockholders’ equity. At December 31, 2018, investments with a carrying value of $1,700 million were on deposit in custodial or trust accounts, of which $1,332 million was on deposit with insurance regulators, $328 million was on deposit in support of the Company’s underwriting activities at Lloyd’s, $37 million was on deposit as security for reinsurance clients and $3 million was on deposit as security for letters of credit issued in support of the Company’s reinsurance operations.

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(4)    Investments in Equity Securities

At December 31, 2018 and 2017, investments in equity securities were as follows:

(In thousands)	Cost		Gross Unrealized (1)					Fair Value		Carrying Value
			Gains		Losses
December 31, 2018
Common stocks	$	113,576	$	4,335	$	(19,719	)	$	98,192	$	98,192
Preferred stocks	115,201		72,364		(6,751		)	180,814		180,814
Total	$	228,777	$	76,699	$	(26,470	)	$	279,006	$	279,006
December 31, 2017
Common stocks	$	81,855	$	272,309	$	(1,960	)	$	352,204	$	352,204
Preferred stocks	124,150		102,890		(2,597		)	224,443		224,443
Total	$	206,005	$	375,199	$	(4,557	)	$	576,647	$	576,647

(1) Effective January 1, 2018, the Company adopted new accounting guidance that requires all equity investments with readily determinable fair values (subject to certain exceptions) to be measured at fair value, with changes in the fair value recognized through net income within net realized and unrealized gains on investments. Refer to Note 1 for additional information.

(5)    Arbitrage Trading Account

At December 31, 2018 and 2017, the fair value and carrying value of the arbitrage trading account were $453 million and $618 million, respectively. The primary focus of the trading account is merger arbitrage. Merger arbitrage is the business of investing in the securities of publicly held companies which are the targets in announced tender offers and mergers. Arbitrage investing differs from other types of investing in its focus on transactions and events believed likely to bring about a change in value over a relatively short time period (usually four months or less).

The Company uses put options, call options and swap contracts in order to mitigate the impact of potential changes in market conditions on the merger arbitrage trading account. These options and contracts are reported at fair value. As of December 31, 2018, the fair value of long option contracts outstanding was $37 thousand (notional amount of $18.4 million) and the fair value of short option contracts outstanding was $58 thousand (notional amount of $11.6 million). Other than with respect to the use of these trading account securities, the Company does not make use of derivatives.

(6)    Net Investment Income

Net investment income consists of the following:

(In thousands)	2018			2017			2016
Investment income earned on:
Fixed maturity securities, including cash and cash equivalents and loans receivable	$	519,269		$	473,101		$	444,247
Investment funds	109,349			68,169			99,301
Arbitrage trading account	28,157			19,145			18,693
Real estate	18,591			19,975			7,054
Equity securities	3,230			2,350			4,028
Gross investment income	678,596			582,740			573,323
Investment expense	(4,361		)	(6,952		)	(9,160		)
Net investment income	$	674,235		$	575,788		$	564,163

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(7)    Investment Funds

The Company evaluates whether it is an investor in a variable interest entity ("VIE").  Such entities do not have sufficient equity at risk to finance their activities without additional subordinated financial support, or the equity investors, as a group, do not have the characteristics of a controlling financial interest (primary beneficiary).  The Company determines whether it is the primary beneficiary of an entity subject to consolidation based on a qualitative assessment of the VIE's capital structure, contractual terms, nature of the VIE's operations and purpose, and the Company's relative exposure to the related risks of the VIE on the date it becomes initially involved in the VIE and on an ongoing basis.  The Company is not the primary beneficiary in any of its investment funds, and accordingly, carries its interests in investments funds under the equity method of accounting.

The Company’s maximum exposure to loss with respect to these investments is limited to the carrying amount reported on the Company’s consolidated balance sheet and its unfunded commitments of $270.2 million as of December 31, 2018.

Investment funds consist of the following:

	Carrying Value as of December 31,				Income (Losses)
(In thousands)	2018		2017		2018		2017			2016
Real estate	$	642,137	$	606,995	$	61,453	$	45,068		$	50,415
Energy	75,213		82,882		645		(15,764		)	19,747
Other funds	615,468		465,800		47,251		38,865			29,139
Total	$	1,332,818	$	1,155,677	$	109,349	$	68,169		$	99,301

The Company's share of the earnings or losses of investment funds is primarily reported on a one-quarter lag in order to facilitate the timely completion of the Company's consolidated financial statements.

(8)    Real Estate

Investment in real estate represents directly owned property held for investment, as follows:    

	As of December 31,
(In thousands)	2018		2017
Properties in operation	$	1,279,584	$	451,691
Properties under development	677,508		1,017,910
Total	$	1,957,092	$	1,469,601

In 2018, properties in operation included a long-term ground lease in Washington, D.C., a hotel in Memphis, Tennessee, two office complexes in New York City, office buildings in West Palm Beach and Palm Beach, Florida, and an office building in London, U.K. The office building in London, previously under development, transferred to properties in operation in 2018. Properties in operation are net of accumulated depreciation and amortization of $44,340,000 and $25,646,000 as of December 31, 2018 and 2017, respectively. Related depreciation expense was $20,644,000 and $9,212,000 for the years ended December 31, 2018 and 2017, respectively. Future minimum rental income expected on operating leases relating to properties in operation is $61,458,048 in 2019, $62,141,471 in 2020, $61,325,176 in 2021, $61,077,419 in 2022, $54,362,011 in 2023 and $584,592,072 thereafter.

The Company borrowed $101,750,000 through a non-recourse loan secured by the West Palm Beach office building in 2018. The loan matures in November 2028 and carries a fixed interest rate of 4.21%. The carrying value does not reflect the outstanding financing, but rather is reflected in subsidiary debt referenced in Note 15, Indebtedness.

A mixed-use project in Washington, D.C. has been under development in 2017 and 2018.    

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(9)    Loans Receivable

Loans receivable are as follows:

	As of December 31,
(In thousands)	2018		2017
Amortized cost (net of valuation allowance):
Real estate loans	$	62,289	$	66,057
Commercial loans	32,524		13,627
Total	$	94,813	$	79,684
Fair value:
Real estate loans	$	63,047	$	66,917
Commercial loans	34,026		15,130
Total	$	97,073	$	82,047
Valuation allowance:
Specific	$	1,200	$	1,200
General	2,183		2,183
Total	$	3,383	$	3,383
	For the Year Ended December 31,
	2018		2017
Increase (decrease) in valuation allowance	$	—	$	(14	)

Loans receivable in non-accrual status were $1.2 million and $4.3 million as of December 31, 2018 and 2017, respectively.

The Company monitors the performance of its loans receivable and assesses the ability of the borrower to pay principal and interest based upon loan structure, underlying property values, cash flow and related financial and operating performance of the property and market conditions. Loans receivable with a potential for default are further assessed using discounted cash flow analysis and comparable cost and sales methodologies, if appropriate.

The real estate loans are secured by commercial real estate primarily located in New York. These loans generally earn interest at floating LIBOR-based interest rates and have maturities (inclusive of extension options) through August 2025. The commercial loans are with small business owners who have secured the related financing with the assets of the business. Commercial loans generally earn interest on a fixed basis and have varying maturities not exceeding 10 years.

In evaluating the real estate loans, the Company considers their credit quality indicators, including loan to value ratios, which compare the outstanding loan amount to the estimated value of the property, the borrower’s financial condition and performance with respect to loan terms, the position in the capital structure, the overall leverage in the capital structure and other market conditions. Based on these considerations, none of the real estate loans were considered to be impaired at December 31, 2018, and accordingly, the Company determined that a specific valuation allowance was not required.

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(10)    Net Realized and Unrealized Gains (Losses) on Investments

Net realized and unrealized gains (losses) on investments are as follows:

(In thousands)	2018			2017			2016
Net realized and unrealized gains (losses) on investments in earnings
Fixed maturity securities:
Gains	$	26,752		$	28,217		$	72,215
Losses	(13,733		)	(5,342		)	(6,434		)
Equity securities (1):
Net realized gains on investment sales	435,150			154,539			14,201
Change in unrealized gains	(320,413		)	—			—
Investment funds (2)	(212		)	125,423			58,861
Real estate	27,816			12,880			7,757
Loans receivable	2,838			—			—
Other (3)	1,977			20,141			138,519
Net realized and unrealized gains on investments in earnings before OTTI	160,175			335,858			285,119
Other-than-temporary impairments (4)	(5,687		)	—			(18,114		)
Net realized and unrealized gains on investments in earnings	154,488			335,858			267,005
Income tax expense	(32,442		)	(117,550		)	(93,452		)
After-tax net realized and unrealized gains on investments in earnings	$	122,046		$	218,308		$	173,553

Change in unrealized investment (losses) gains of available for sales securities:
Fixed maturity securities	$	(297,084	)	$	(2,192	)	$	(107,094	)
Previously impaired fixed maturity securities	(132		)	895			451
Equity securities available for sale (5)	—			(77,971		)	465,727
Investment funds	(5,521		)	9,843			12,631
Total change in unrealized investment (losses) gains	(302,737		)	(69,425		)	371,715
Income tax benefit (expense)	50,410			17,673			(125,315		)
Noncontrolling interests	(46		)	19			59
After-tax change in unrealized investment (losses) gains of available for sale securities	$	(252,373	)	$	(51,733	)	$	246,459

____________________

(1) The net realized gains or losses on investment sales represent the total gains or losses from the purchase dates of the equity securities. The change in unrealized gains consists of two components: (i) the reversal of the gain or loss recognized in previous periods on equity securities sold and (ii) the change in unrealized gain or loss resulting from mark-to-market adjustments on equity securities still held.

(2) Investment funds includes a gain of $124 million from the sale of an investment in an office building located in Washington, D.C. for the year ended December 31, 2017.

(3) Other includes a gain of $135 million from the sale of Aero Precision Industries and certain related aviation services business for the year ended December 31, 2016.

(4) For the year ended December 31, 2018, OTTI related to fixed maturity securities was $6 million. There were no OTTI for the year ended December 31, 2017. For the year ended December 31, 2016, OTTI related to equity securities was $18 million.

(5) Effective January 1, 2018, the Company adopted new accounting guidance that requires all equity investments with readily determinable fair values (subject to certain exceptions) to be measured at fair value with changes in the fair value recognized in net income. The Company recorded an adjustment of $291 million to opening AOCI net of tax as a result of this guidance. Refer to Note 1 for further information.

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(11)    Securities in an Unrealized Loss Position

The following tables summarize all fixed maturity securities in an unrealized loss position at December 31, 2018 and 2017 by the length of time those securities have been continuously in an unrealized loss position.

	Less Than 12 Months				12 Months or Greater				Total
(In thousands)	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
December 31, 2018
U.S. government and government agency	$	195,359	$	933	$	130,815	$	3,977	$	326,174	$	4,910
State and municipal	701,700		6,874		744,905		17,738		1,446,605		24,612
Mortgage-backed securities	334,063		2,911		712,595		21,022		1,046,658		23,933
Asset-backed securities	1,687,665		28,965		342,855		4,722		2,030,520		33,687
Corporate	1,730,513		54,181		954,763		49,129		2,685,276		103,310
Foreign government	246,273		24,197		80,004		914		326,277		25,111
Fixed maturity securities	$	4,895,573	$	118,061	$	2,965,937	$	97,502	$	7,861,510	$	215,563
December 31, 2017
U.S. government and government agency	$	92,167	$	1,491	$	72,055	$	2,341	$	164,222	$	3,832
State and municipal	735,972		5,944		345,755		6,630		1,081,727		12,574
Mortgage-backed securities	480,435		5,110		373,956		11,065		854,391		16,175
Asset-backed securities	1,127,309		8,298		167,412		2,314		1,294,721		10,612
Corporate	1,103,747		8,224		170,858		5,946		1,274,605		14,170
Foreign government	244,139		2,615		25,824		251		269,963		2,866
Fixed maturity securities	$	3,783,769	$	31,682	$	1,155,860	$	28,547	$	4,939,629	$	60,229

Fixed Maturity Securities — A summary of the Company’s non-investment grade fixed maturity securities that were in an unrealized loss position at December 31, 2018 is presented in the table below:

($ in thousands)	Number of Securities	Aggregate Fair Value		Gross Unrealized Loss
Foreign government	13	$	140,854	$	21,411
Corporate	13	120,078		13,111
Asset-backed securities	5	14,662		2,593
Mortgage-backed securities	5	8,741		69
Total	36	$	284,335	$	37,184

For OTTI of fixed maturity securities that management does not intend to sell or, more likely than not, would not be required to sell, the portion of the decline in value considered to be due to credit factors is recognized in earnings and the portion of the decline in value considered to be due to non-credit factors is recognized in other comprehensive income.

For the year ended December 31, 2018, OTTI recognized in earnings for fixed maturity securities was $6 million. For the year ended December 31, 2017, there were no OTTI on fixed maturity securities.

The Company has evaluated its fixed maturity securities in an unrealized loss position and believes the unrealized losses are due primarily to temporary market and sector-related factors rather than to issuer-specific factors. None of these securities are delinquent or in default on financial covenants. Based on its assessment of these issuers, the Company expects them to continue to meet their contractual payment obligations as they become due and does not consider any of these securities to be OTTI.

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(12)    Fair Value Measurements

The Company’s fixed maturity and equity securities classified as available for sale and its trading account securities are carried at fair value. Fair value is defined as “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”. The Company utilizes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value into three broad levels, as follows:

Level 1 - Quoted prices (unadjusted) in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date.  

Level 2 - Quoted prices for similar assets or valuations based on inputs that are observable.

Level 3 - Estimates of fair value based on internal pricing methodologies using unobservable inputs. Unobservable inputs are only used to measure fair value to the extent that observable inputs are not available.

Substantially all of the Company’s fixed maturity securities were priced by independent pricing services. The prices provided by the independent pricing services are estimated based on observable market data in active markets utilizing pricing models and processes, which may include benchmark yields, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers, sector groupings, matrix pricing and reference data. The pricing services may prioritize inputs differently on any given day for any security based on market conditions, and not all inputs are available for each security evaluation on any given day. The pricing services used by the Company have indicated that they will only produce an estimate of fair value if objectively verifiable information is available. The determination of whether markets are active or inactive is based upon the volume and level of activity for a particular asset class. The Company reviews the prices provided by pricing services for reasonableness and periodically performs independent price tests of a sample of securities to ensure proper valuation.

If prices from independent pricing services are not available for fixed maturity securities, the Company estimates the fair value. For Level 2 securities, the Company utilizes pricing models and processes which may include benchmark yields, sector groupings, matrix pricing, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, bids, offers and reference data. Where broker quotes are used, the Company generally requests two or more quotes and sets a price within the range of quotes received based on its assessment of the credibility of the quote and its own evaluation of the security. The Company generally does not adjust quotes received from brokers. For securities traded only in private negotiations, the Company determines fair value based primarily on the cost of such securities, which is adjusted to reflect prices of recent placements of securities of the same issuer, financial projections, credit quality and business developments of the issuer and other relevant information.

For Level 3 securities, the Company generally uses a discounted cash flow model to estimate the fair value of fixed maturity securities. The cash flow models are based upon assumptions as to prevailing credit spreads, interest rate and interest rate volatility, time to maturity and subordination levels. Projected cash flows are discounted at rates that are adjusted to reflect illiquidity, where appropriate.

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The following tables present the assets and liabilities measured at fair value as of December 31, 2018 and 2017 by level:

(In thousands)	Total		Level 1		Level 2		Level 3
December 31, 2018
Assets:
Fixed maturity securities available for sale:
U.S. government and government agency	$	702,240	$	—	$	702,240	$	—
State and municipal	3,872,598		—		3,872,598		—
Mortgage-backed securities	1,594,546		—		1,594,546		—
Asset-backed securities	2,438,747		—		2,438,648		99
Corporate	4,111,311		—		4,111,311		—
Foreign government	808,735		—		808,735		—
Total fixed maturity securities available for sale	13,528,177		—		13,528,078		99
Equity securities:
Common stocks	98,192		89,596		—		8,596
Preferred stocks	180,814		—		176,869		3,945
Total equity securities	279,006		89,596		176,869		12,541
Arbitrage trading account	452,548		353,335		81,905		17,308
Total	$	14,259,731	$	442,931	$	13,786,852	$	29,948
Liabilities:
Trading account securities sold but not yet purchased	$	38,120	$	37,327	$	—	$	793
December 31, 2017
Assets:
Fixed maturity securities available for sale:
U.S. government and government agency	$	377,740	$	—	$	377,740	$	—
State and municipal	4,445,094		—		4,445,094		—
Mortgage-backed securities	1,299,931		—		1,299,931		—
Asset-backed securities	2,111,544		—		2,111,372		172
Corporate	4,389,112		—		4,389,112		—
Foreign government	848,497		—		848,497		—
Total fixed maturity securities available for sale	13,471,918		—		13,471,746		172
Equity securities:
Common stocks	352,204		342,834		—		9,370
Preferred stocks	224,443		—		213,600		10,843
Total equity securities	576,647		342,834		213,600		20,213
Arbitrage trading account	617,649		471,420		146,229		—
Total	$	14,666,214	$	814,254	$	13,831,575	$	20,385
Liabilities:
Trading account securities sold but not yet purchased	$	64,358	$	64,358	$	—	$	—

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The following tables summarize changes in Level 3 assets and liabilities for the years ended December 31, 2018 and 2017:

	Gains (Losses) Included in:
(In thousands)	Beginning Balance		Earnings (Losses)			Other Comprehensive Income (Losses)		Impairments		Purchases		Sales			Paydowns/Maturities		Transfers In / Out		Ending Balance
Year ended December 31, 2018
Assets:
Fixed maturity securities available for sale:
Asset-backed securities	$	172	$	(2	)	$	46	$	—	$	—	$	(117	)	$	—	$	—	$	99
Total	172		(2		)	46		—		—		(117		)	—		—		99
Equity securities:
Common stocks	9,370		(548		)			—		—		(227		)	—		1		8,596
Preferred stocks	10,843		100			—		—				(6,998		)	—		—		3,945
Total	20,213		(448		)	—		—		—		(7,225		)	—		1		12,541
Arbitrage trading account	—		(6		)	—		—		11,523		(11		)	—		5,802		17,308
Total	$	20,385	$	(456	)	$	46	$	—	$	11,523	$	(7,353	)	$	—	$	5,803	$	29,948
Year ended December 31, 2017
Assets:
Fixed maturity securities available for sale:
Asset-backed securities	$	183	$	3		$	34	$	—	$	—	$	(48	)	$	—	$	—	$	172
Total	183		3			34		—		—		(48		)	—		—		172
Equity securities:
Common stocks	8,754		—			616		—		—		—			—		—		9,370
Preferred stocks	3,662		8			—		—		7,173		—			—		—		10,843
Total	12,416		8			616		—		7,173		—			—		—		20,213
Arbitrage trading account	—		8			—		—		—		(8		)	—		—		—
Total	$	12,599	$	19		$	650	$	—	$	7,173	$	(56	)	$	—	$	—	$	20,385

For the year ended December 31, 2018, one common stock in the arbitrage trading account was transferred into Level 3 and one common stock was transferred out of Level 3. In the case of the transfer into Level 3, a publicly traded price was no longer available and in the case of the transfer out, a publicly traded price became available. For the year ended December 31, 2017, there were no transfers in or out of Level 3.

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(13)    Reserves for Losses and Loss Expenses

The Company's reserves for losses and loss expenses are comprised of case reserves and incurred but not reported liabilities (IBNR). When a claim is reported, a case reserve is established for the estimated ultimate payment based upon known information about the claim. As more information about the claim becomes available over time, case reserves are adjusted up or down as appropriate. Reserves are also established on an aggregate basis to provide for IBNR liabilities and expected loss reserve development on reported claims.

Loss reserves included in the Company’s financial statements represent management’s best estimates based upon an actuarially derived point estimate and other considerations. The Company uses a variety of actuarial techniques and methods to derive an actuarial point estimate for each operating unit. These methods include paid loss development, incurred loss development, paid and incurred Bornhuetter-Ferguson methods and frequency and severity methods. In circumstances where one actuarial method is considered more credible than the others, that method is used to set the point estimate. The actuarial point estimate may also be based on a judgmental weighting of estimates produced from each of the methods considered. Industry loss experience is used to supplement the Company’s own data in selecting “tail factors” in areas where the Company’s own data is limited. The actuarial data is analyzed by line of business, coverage and accident or policy year, as appropriate, for each operating unit.

The establishment of the actuarially derived loss reserve point estimate also includes consideration of qualitative factors that may affect the ultimate losses. These qualitative considerations include, among others, the impact of re-underwriting initiatives, changes in the mix of business, changes in distribution sources and changes in policy terms and conditions.

The key assumptions used to arrive at the best estimate of loss reserves are the expected loss ratios, rate of loss cost inflation, and reported and paid loss emergence patterns. Expected loss ratios represent management’s expectation of losses at the time the business is priced and written, before any actual claims experience has emerged. This expectation is a significant determinant of the estimate of loss reserves for recently written business where there is little paid or incurred loss data to consider. Expected loss ratios are generally derived from historical loss ratios adjusted for the impact of rate changes, loss cost trends and known changes in the type of risks underwritten. Expected loss ratios are estimated for each key line of business within each operating unit. Expected loss cost inflation is particularly important for the long-tail lines, such as excess casualty, and claims with a high medical component, such as workers’ compensation. Reported and paid loss emergence patterns are used to project current reported or paid loss amounts to their ultimate settlement value. Loss development factors are based on the historical emergence patterns of paid and incurred losses, and are derived from the Company’s own experience and industry data. The paid loss emergence pattern is also significant to excess and assumed workers’ compensation reserves because those reserves are discounted to their estimated present value based upon such estimated payout patterns.

Loss frequency and severity are measures of loss activity that are considered in determining the key assumptions described in our discussion of loss and loss expense reserves, including expected loss ratios, rate of loss cost inflation and reported and paid loss emergence patterns. Loss frequency is a measure of the number of claims per unit of insured exposure, and loss severity is a measure of the average size of claims. Factors affecting loss frequency include the effectiveness of loss controls and safety programs and changes in economic activity or weather patterns. Factors affecting loss severity include changes in policy limits, retentions, rate of inflation and judicial interpretations.

Another factor affecting estimates of loss frequency and severity is the loss reporting lag, which is the period of time between the occurrence of a loss and the date the loss is reported to the Company. The length of the loss reporting lag affects our ability to accurately predict loss frequency (loss frequencies are more predictable for lines with short reporting lags) as well as the amount of reserves needed for incurred but not reported losses (less IBNR is required for lines with short reporting lags). As a result, loss reserves for lines with short reporting lags are likely to have less variation from initial loss estimates. For lines with short reporting lags, which include commercial automobile, primary workers’ compensation, other liability (claims-made) and property business, the key assumption is the loss emergence pattern used to project ultimate loss estimates from known losses paid or reported to date. For lines of business with long reporting lags, which include other liability (occurrence), products liability, excess workers’ compensation and liability reinsurance, the key assumption is the expected loss ratio since there is often little paid or incurred loss data to consider. Historically, the Company has experienced less variation from its initial loss estimates for lines of businesses with short reporting lags than for lines of business with long reporting lags.

The key assumptions used in calculating the most recent estimate of the loss reserves are reviewed each quarter and adjusted, to the extent necessary, to reflect the latest reported loss data, current trends and other factors observed.

A claim may be defined as an event, as a claimant (number of parties claiming damages from an event) or by exposure type (e.g., an event may give rise to two parties, each claiming loss for bodily injury and property damage).

The most commonly used claim count method is by event. Most of the Company's operating units use the number of events to define and quantify the number of claims. However, in certain lines of business, where it is common for multiple parties to claim

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damages arising from a single event, an operating unit may quantify claims on the basis of the number of separate parties involved in an event. This may be the case with businesses writing substantial automobile or transportation exposure.

Claim counts for assumed reinsurance will vary based on whether the business is written on a facultative or treaty basis. Further variability as respects treaty claim counts may be reflective of the nature of the treaty, line of business coverage, and type of participation such as quota share or excess of loss contracts. Accordingly, the claim counts have been excluded from the below Reinsurance segment tables due to this variability.

The claim count information set forth in the tables presented below may not provide an accurate reflection of ultimate loss payouts by product line.

The following tables present undiscounted incurred and paid claims development as of December 31, 2018, net of reinsurance, as well as cumulative claim frequency and the total of incurred but not reported liabilities (IBNR). The information about incurred and paid claims development for the years ended December 31, 2009 to 2017 is presented as supplementary information. To enhance the comparability of the loss development data, the Company has removed the impact of foreign exchange rate movements by using the December 31, 2018 exchange rate for all periods. Beginning with accident year 2012, the Company's U.K. and European insurance business is included in the Insurance segment's tables for Other Liability, Professional Liability, Commercial Automobile and Short-Tail Lines. Prior to 2012, the actuarial analysis for its U.K. and European insurance business was performed on an underwriting year basis and accident year data is not available for those years.

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Insurance

Other Liability

(In thousands)

Loss and Loss Expenses Incurred, Net of Reinsurance																					As of December 31, 2018
For the Year Ended December 31,
	Unaudited
Accident Year	2009		2010		2011		2012		2013		2014		2015		2016		2017		2018		IBNR		Cumulative Number of Reported Claims
2009	$	689,634	$	656,788	$	624,991	$	599,235	$	589,659	$	561,784	$	557,661	$	553,058	$	546,746	$	542,568	$	18,690	23
2010	—		612,210		615,797		592,117		590,818		577,679		574,780		573,532		571,305		566,695		26,658		23
2011	—		—		665,035		673,730		660,023		659,026		653,864		649,055		645,123		634,264		30,381		24
2012	—		—		—		693,447		702,342		703,118		709,026		713,266		723,610		718,166		47,001		24
2013	—		—		—		—		751,544		792,464		784,906		784,342		805,288		811,592		78,784		26
2014	—		—		—		—		—		847,207		848,947		847,008		851,503		864,157		128,856		26
2015	—		—		—		—		—		—		951,041		986,792		961,289		964,415		217,570		26
2016	—		—		—		—		—		—		—		1,018,454		1,011,368		1,019,749		375,609		25
2017	—		—		—		—		—		—		—		—		1,067,376		1,100,243		567,982		23
2018	—		—		—		—		—		—		—		—		—		1,104,518		837,548		18
Total																			$	8,326,367

Cumulative Paid Claims and Claim Adjustment Expenses, Net of Reinsurance
For the Year Ended December 31,
	Unaudited
Accident Year	2009		2010		2011		2012		2013		2014		2015		2016		2017		2018
2009	$	44,801	$	122,850	$	214,498	$	311,979	$	385,068	$	429,128	$	470,830	$	486,893	$	500,953	$	510,474
2010	—		45,193		128,946		248,698		336,243		417,166		461,442		491,104		508,359		525,016
2011	—		—		48,825		142,713		266,780		379,845		470,849		524,314		556,110		575,194
2012	—		—		—		58,108		158,869		299,842		417,686		513,644		580,750		622,687
2013	—		—		—		—		63,868		189,936		332,871		473,933		589,564		650,428
2014	—		—		—		—		—		79,078		191,394		338,961		481,039		595,024
2015	—		—		—		—		—		—		82,829		210,940		382,498		538,502
2016	—		—		—		—		—		—		—		69,620		209,212		390,552
2017	—		—		—		—		—		—		—		—		80,174		256,448
2018	—		—		—		—		—		—		—		—		—		87,075
Total																			$	4,751,400
	Reserves for loss and loss adjustment expenses before 2009, net of reinsurance																		121,405
	Reserves for loss and loss adjustment expenses, net of reinsurance																		$	3,696,372

79

Primary Workers' Compensation

(In thousands)

Loss and Loss Expenses Incurred, Net of Reinsurance																					As of December 31, 2018
For the Year Ended December 31,
	Unaudited
Accident Year	2009		2010		2011		2012		2013		2014		2015		2016		2017		2018		IBNR		Cumulative Number of Reported Claims
2009	$	327,537	$	332,303	$	326,766	$	386,870	$	392,158	$	394,303	$	392,287	$	395,288	$	398,994	$	401,431	$	10,693	43
2010	—		358,734		361,808		409,237		418,315		426,622		429,952		429,762		427,698		424,374		13,958		45
2011	—		—		419,364		442,550		454,797		470,026		472,087		474,076		475,729		471,471		17,942		46
2012	—		—		—		499,752		499,882		503,956		503,863		509,167		512,707		508,169		26,626		48
2013	—		—		—		—		551,342		547,295		546,995		543,238		547,000		542,274		35,177		53
2014	—		—		—		—		—		639,436		637,307		627,767		617,242		615,435		57,455		57
2015	—		—		—		—		—		—		712,800		690,525		650,997		641,169		83,941		58
2016	—		—		—		—		—		—		—		702,716		696,339		684,700		117,425		57
2017	—		—		—		—		—		—		—		—		762,093		733,505		191,034		57
2018	—		—		—		—		—		—		—		—		—		778,964		359,337		53
Total																			$	5,801,492

Cumulative Paid Claims and Claim Adjustment Expenses, Net of Reinsurance
For the Year Ended December 31,
	Unaudited
Accident Year	2009		2010		2011		2012		2013		2014		2015		2016		2017		2018
2009	$	93,647	$	197,736	$	257,972	$	297,079	$	317,796	$	333,793	$	344,771	$	352,516	$	360,289	$	364,712
2010	—		107,742		214,034		279,226		317,986		344,631		362,078		374,013		382,665		388,405
2011	—		—		106,157		234,694		307,873		355,909		385,759		408,304		420,945		428,811
2012	—		—		—		114,998		253,781		339,560		387,368		419,588		437,196		451,991
2013	—		—		—		—		117,502		277,538		363,028		414,160		447,894		466,580
2014	—		—		—		—		—		148,405		319,743		412,611		471,235		503,915
2015	—		—		—		—		—		—		139,320		323,744		421,734		477,541
2016	—		—		—		—		—		—		—		142,998		338,835		446,072
2017	—		—		—		—		—		—		—		—		153,456		362,299
2018	—		—		—		—		—		—		—		—		—		171,006
Total																			$	4,061,332
			Reserves for loss and loss adjustment expenses before 2009, net of reinsurance																170,897
			Reserves for loss and loss adjustment expenses, net of reinsurance																$	1,911,057

80

Excess Workers' Compensation

(In thousands)

Loss and Loss Expenses Incurred, Net of Reinsurance																					As of December 31, 2018
For the Year Ended December 31,
	Unaudited
Accident Year	2009		2010		2011		2012		2013		2014		2015		2016		2017		2018		IBNR		Cumulative Number of Reported Claims
2009	$	168,762	$	153,766	$	153,912	$	148,223	$	148,189	$	138,765	$	142,768	$	134,716	$	129,249	$	130,790	$	21,734	1
2010	—		135,639		123,497		120,272		118,712		100,331		104,732		100,065		94,986		95,374		14,497		1
2011	—		—		88,650		93,993		98,051		87,064		85,299		83,850		78,246		74,109		17,280		1
2012	—		—		—		72,366		73,230		71,780		73,653		72,441		67,878		69,361		16,293		1
2013	—		—		—		—		63,995		48,493		46,025		42,419		38,551		35,120		16,473		1
2014	—		—		—		—		—		63,465		57,558		49,478		45,758		41,671		18,448		1
2015	—		—		—		—		—		—		69,977		57,897		50,099		45,115		25,425		—
2016	—		—		—		—		—		—		—		72,657		70,281		71,404		37,500		—
2017	—		—		—		—		—		—		—		—		76,701		80,508		42,652		1
2018	—		—		—		—		—		—		—		—		—		77,820		46,840		1
Total																			$	721,272

Cumulative Paid Claims and Claim Adjustment Expenses, Net of Reinsurance
For the Year Ended December 31,
	Unaudited
Accident Year	2009		2010		2011		2012		2013		2014		2015		2016		2017		2018
2009	$	5,060	$	8,402	$	11,037	$	14,138	$	20,729	$	25,272	$	29,150	$	33,573	$	37,817	$	41,243
2010	—		2,867		4,003		5,571		8,701		9,084		11,699		14,261		18,821		22,355
2011	—		—		2,593		4,848		6,395		12,104		15,684		18,638		20,164		21,463
2012	—		—		—		1,127		6,097		9,480		11,167		13,234		15,738		17,982
2013	—		—		—		—		647		630		2,158		3,008		3,396		4,418
2014	—		—		—		—		—		358		1,729		3,354		4,175		5,808
2015	—		—		—		—		—		—		2,069		2,481		3,272		4,099
2016	—		—		—		—		—		—		—		2,498		4,783		5,573
2017	—		—		—		—		—		—		—		—		6,282		12,810
2018	—		—		—		—		—		—		—		—		—		6,141
Total																			$	141,892
	Reserves for loss and loss adjustment expenses before 2009, net of reinsurance																		740,877
	Reserves for loss and loss adjustment expenses, net of reinsurance																		$	1,320,257

81

Professional Liability

(In thousands)

Loss and Loss Expenses Incurred, Net of Reinsurance																					As of December 31, 2018
For the Year Ended December 31,
	Unaudited
Accident Year	2009		2010		2011		2012		2013		2014		2015		2016		2017		2018		IBNR		Cumulative Number of Reported Claims
2009	$	134,784	$	139,091	$	145,515	$	148,899	$	147,994	$	150,452	$	150,783	$	153,492	$	152,711	$	157,451	$	1,087	3
2010	—		147,649		165,755		179,383		177,957		176,723		172,585		174,883		177,844		182,818		1,807		4
2011	—		—		179,875		165,233		186,918		190,096		177,128		173,545		176,865		175,963		3,185		4
2012	—		—		—		238,233		241,944		264,808		250,457		238,704		245,076		243,893		9,507		7
2013	—		—		—		—		269,280		247,320		242,792		248,974		270,449		279,092		15,395		7
2014	—		—		—		—		—		253,284		246,668		259,964		243,936		239,555		19,315		8
2015	—		—		—		—		—		—		259,569		258,251		274,950		276,406		47,934		9
2016	—		—		—		—		—		—		—		310,678		324,979		361,929		90,872		10
2017	—		—		—		—		—		—		—		—		333,803		333,194		178,091		9
2018	—		—		—		—		—		—		—		—		—		335,751		260,095		9
Total																			$	2,586,052

Cumulative Paid Claims and Claim Adjustment Expenses, Net of Reinsurance
For the Year Ended December 31,
	Unaudited
Accident Year	2009		2010		2011		2012		2013		2014		2015		2016		2017		2018
2009	$	12,604	$	52,583	$	85,902	$	117,683	$	127,728	$	138,876	$	143,950	$	144,713	$	147,599	$	151,499
2010	—		14,832		58,916		108,566		129,757		144,474		160,598		165,018		171,330		178,879
2011	—		—		18,779		62,442		103,097		134,608		150,840		159,014		167,286		168,874
2012	—		—		—		21,875		87,008		128,281		159,183		190,295		214,315		223,424
2013	—		—		—		—		24,232		64,030		119,552		177,343		206,655		248,520
2014	—		—		—		—		—		19,545		83,856		138,753		176,181		199,245
2015	—		—		—		—		—		—		20,478		85,561		139,952		187,767
2016	—		—		—		—		—		—		—		28,702		102,853		202,131
2017	—		—		—		—		—		—		—		—		36,733		96,814
2018	—		—		—		—		—		—		—		—		—		28,307
Total																			$	1,685,460
	Reserves for loss and loss adjustment expenses before 2009, net of reinsurance																		4,198
	Reserves for loss and loss adjustment expenses, net of reinsurance																		$	904,790

82

Commercial Automobile

(In thousands)

Loss and Loss Expenses Incurred, Net of Reinsurance																					As of December 31, 2018
For the Year Ended December 31,
	Unaudited
Accident Year	2009		2010		2011		2012		2013		2014		2015		2016		2017		2018		IBNR		Cumulative Number of Reported Claims
2009	$	362,302	$	345,139	$	340,967	$	335,851	$	337,915	$	336,855	$	334,652	$	335,089	$	334,977	$	334,926	$	398	39
2010	—		310,591		320,098		330,190		328,854		332,716		331,581		330,552		330,263		329,942		372		37
2011	—		—		312,224		320,898		328,269		331,694		341,362		341,162		342,052		343,524		1,232		37
2012	—		—		—		314,073		326,585		342,379		355,433		364,175		364,437		366,662		1,539		40
2013	—		—		—		—		326,789		348,513		368,318		376,569		366,976		366,565		3,013		42
2014	—		—		—		—		—		363,308		384,692		418,215		416,194		413,697		6,431		45
2015	—		—		—		—		—		—		389,101		417,403		423,601		431,857		18,247		50
2016	—		—		—		—		—		—		—		431,633		431,680		443,030		35,867		49
2017	—		—		—		—		—		—		—		—		430,352		428,601		70,289		44
2018	—		—		—		—		—		—		—		—		—		442,862		145,744		39
Total																			$	3,901,666

Cumulative Paid Claims and Claim Adjustment Expenses, Net of Reinsurance
For the Year Ended December 31,
	Unaudited
Accident Year	2009		2010		2011		2012		2013		2014		2015		2016		2017		2018
2009	$	136,433	$	209,553	$	257,326	$	291,925	$	312,902	$	328,843	$	331,482	$	333,143	$	333,605	$	333,677
2010	—		136,029		208,790		263,639		295,347		313,253		324,963		326,770		327,206		327,829
2011	—		—		135,350		211,756		262,659		296,332		321,786		333,949		338,283		340,319
2012	—		—		—		136,844		215,078		273,277		312,178		344,428		355,740		360,799
2013	—		—		—		—		142,480		218,005		266,694		322,141		343,274		353,159
2014	—		—		—		—		—		155,065		237,118		328,156		365,424		394,147
2015	—		—		—		—		—		—		159,679		265,396		325,369		370,450
2016	—		—		—		—		—		—		—		185,045		280,146		342,214
2017	—		—		—		—		—		—		—		—		180,627		267,469
2018	—		—		—		—		—		—		—		—		—		180,213
Total																			$	3,270,276
			Reserves for loss and loss adjustment expenses before 2009, net of reinsurance																2,482
			Reserves for loss and loss adjustment expenses, net of reinsurance																$	633,872

83

Short-tail lines

(In thousands)

Loss and Loss Expenses Incurred, Net of Reinsurance																					As of December 31, 2018
For the Year Ended December 31,
	Unaudited
Accident Year	2009		2010		2011		2012		2013		2014		2015		2016		2017		2018		IBNR		Cumulative Number of Reported Claims
2009	$	346,870	$	335,921	$	326,440	$	318,111	$	318,349	$	314,290	$	314,117	$	314,010	$	316,220	$	317,098	$	550	18
2010	—		385,541		370,291		358,373		355,916		346,226		346,719		346,885		346,463		346,172		833		19
2011	—		—		478,556		471,555		463,006		459,814		457,011		450,115		449,320		451,211		1,093		21
2012	—		—		—		526,312		535,500		535,885		531,729		507,646		506,705		508,565		3,083		25
2013	—		—		—		—		572,103		583,603		575,582		553,621		552,137		548,730		5,740		26
2014	—		—		—		—		—		701,335		709,832		664,303		663,282		664,350		6,562		30
2015	—		—		—		—		—		—		743,872		731,468		727,677		726,606		15,079		32
2016	—		—		—		—		—		—		—		771,416		774,514		761,891		20,857		34
2017	—		—		—		—		—		—		—		—		750,786		752,193		34,275		38
2018	—		—		—		—		—		—		—		—		—		759,340		161,107		36
Total																			$	5,836,156

Cumulative Paid Claims and Claim Adjustment Expenses, Net of Reinsurance
For the Year Ended December 31,
	Unaudited
Accident Year	2009		2010		2011		2012		2013		2014		2015		2016		2017		2018
2009	$	212,521	$	291,338	$	304,634	$	306,020	$	309,916	$	310,428	$	311,079	$	311,357	$	311,655	$	315,966
2010	—		245,036		325,156		337,686		346,768		340,210		342,918		344,102		345,085		345,106
2011	—		—		303,012		417,701		436,585		440,777		445,073		446,745		447,342		450,155
2012	—		—		—		281,456		453,157		503,364		513,733		498,506		499,446		503,738
2013	—		—		—		—		312,945		486,692		534,939		531,386		538,158		539,443
2014	—		—		—		—		—		371,194		596,829		613,621		633,020		648,373
2015	—		—		—		—		—		—		396,086		612,335		667,846		689,875
2016	—		—		—		—		—		—		—		416,144		669,029		710,618
2017	—		—		—		—		—		—		—		—		444,407		688,821
2018	—		—		—		—		—		—		—		—		—		415,206
Total																			$	5,307,301
	Reserves for loss and loss adjustment expenses before 2009, net of reinsurance																		2,362
	Reserves for loss and loss adjustment expenses, net of reinsurance																		$	531,217

84

Reinsurance

Casualty

(In thousands)

Loss and Loss Expenses Incurred, Net of Reinsurance																					As of December 31, 2018
For the Year Ended December 31,
	Unaudited
Accident Year	2009		2010		2011		2012		2013		2014		2015		2016		2017		2018		IBNR
2009	$	334,804	$	328,321	$	327,236	$	309,228	$	301,495	$	293,275	$	282,411	$	288,115	$	281,592	$	279,372	$	17,086
2010	—		290,285		298,300		288,141		276,234		265,771		254,550		251,308		249,062		248,145		18,428
2011	—		—		290,635		309,621		304,409		299,628		306,911		303,867		295,576		292,162		21,264
2012	—		—		—		331,603		335,661		331,006		324,014		332,932		335,636		333,889		25,536
2013	—		—		—		—		319,159		270,221		273,528		283,580		292,447		298,061		33,269
2014	—		—		—		—		—		320,250		320,176		319,855		331,836		326,251		49,301
2015	—		—		—		—		—		—		259,609		232,203		231,020		253,264		30,511
2016	—		—		—		—		—		—		—		241,282		253,450		246,235		62,140
2017	—		—		—		—		—		—		—		—		231,826		221,820		122,752
2018	—		—		—		—		—		—		—		—		—		221,945		184,317
Total																			$	2,721,144

Cumulative Paid Claims and Claim Adjustment Expenses, Net of Reinsurance
For the Year Ended December 31,
	Unaudited
Accident Year	2009		2010		2011		2012		2013		2014		2015		2016		2017		2018
2009	$	21,332	$	53,636	$	85,761	$	124,030	$	155,124	$	181,946	$	196,775	$	211,143	$	221,141	$	228,990
2010	—		17,964		45,626		77,191		106,381		129,041		149,322		165,027		180,544		190,295
2011	—		—		17,876		52,365		97,702		134,285		168,244		191,864		207,692		220,011
2012	—		—		—		22,390		62,198		111,928		151,635		186,483		219,106		240,926
2013	—		—		—		—		28,920		63,849		109,202		143,268		177,101		204,820
2014	—		—		—		—		—		21,306		69,134		116,266		155,764		198,993
2015	—		—		—		—		—		—		17,865		48,593		91,548		141,834
2016	—		—		—		—		—		—		—		19,923		61,930		100,587
2017	—		—		—		—		—		—		—		—		16,493		40,338
2018	—		—		—		—		—		—		—		—		—		11,152
Total																			$	1,577,946
	Reserves for loss and loss adjustment expenses before 2009, net of reinsurance																		369,801
			Reserves for loss and loss adjustment expenses, net of reinsurance																$	1,512,999

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Property

(In thousands)

Loss and Loss Expenses Incurred, Net of Reinsurance																					As of December 31, 2018
For the Year Ended December 31,
	Unaudited
Accident Year	2009		2010		2011		2012		2013		2014		2015		2016		2017		2018		IBNR
2009	$	48,029	$	43,193	$	42,352	$	38,711	$	38,124	$	37,505	$	36,913	$	36,263	$	35,293	$	35,763	$	—
2010	—		58,576		55,647		52,561		51,448		51,500		50,971		50,871		50,699		50,932		201
2011	—		—		95,217		87,970		85,118		86,544		85,006		84,739		84,471		84,882		314
2012	—		—		—		103,744		94,720		86,426		85,451		83,925		83,938		84,875		626
2013	—		—		—		—		141,298		112,590		114,063		111,915		112,555		111,876		1,192
2014	—		—		—		—		—		112,987		96,668		97,363		100,148		99,410		1,739
2015	—		—		—		—		—		—		127,039		117,582		131,777		130,452		4,367
2016	—		—		—		—		—		—		—		167,989		174,562		181,858		11,130
2017	—		—		—		—		—		—		—		—		206,604		200,535		24,102
2018	—		—		—		—		—		—		—		—		—		108,281		40,135
Total																			$	1,088,864

Cumulative Paid Claims and Claim Adjustment Expenses, Net of Reinsurance
For the Year Ended December 31,
	Unaudited
Accident Year	2009		2010		2011		2012		2013		2014		2015		2016		2017		2018
2009	$	9,766	$	21,945	$	28,226	$	29,444	$	31,248	$	31,238	$	32,540	$	34,759	$	34,027	$	35,158
2010	—		23,654		37,739		42,413		43,898		44,824		46,419		49,048		49,303		50,053
2011	—		—		31,478		58,875		73,359		76,010		78,577		81,780		82,322		83,401
2012	—		—		—		15,675		51,774		64,238		70,672		77,540		79,099		81,808
2013	—		—		—		—		36,609		74,602		92,646		101,553		104,333		106,051
2014	—		—		—		—		—		38,919		67,000		82,329		88,507		91,646
2015	—		—		—		—		—		—		53,498		89,228		109,187		118,686
2016	—		—		—		—		—		—		—		78,969		133,653		157,622
2017	—		—		—		—		—		—		—		—		72,157		141,458
2018	—		—		—		—		—		—		—		—		—		34,125
Total																			$	900,008
	Reserves for loss and loss adjustment expenses before 2009, net of reinsurance																		776
	Reserves for loss and loss adjustment expenses, net of reinsurance																		$	189,632

86

The reconciliation of the net incurred and paid claims development tables to the reserves for loss and loss adjustment expenses in the consolidated balance sheet is as follows:

(In thousands)		December 31, 2018
Undiscounted reserves for loss and loss expenses, net of reinsurance:
	Other liability	$	3,696,372
	Primary workers' compensation	1,911,057
	Excess workers' compensation	1,320,257
	Professional liability	904,790
	Commercial automobile	633,872
	Short-tail lines	531,217
	Other	111,779
	Insurance	9,109,344
	Casualty	1,512,999
	Property	189,632
	Reinsurance	1,702,631
Total undiscounted reserves for loss and loss expenses, net of reinsurance		$	10,811,975

(In thousands)		December 31, 2018
Due from reinsurers on unpaid claims:
	Other liability	$	451,073
	Primary workers' compensation	374,805
	Excess workers' compensation	37,405
	Professional liability	344,958
	Commercial automobile	15,405
	Short-tail lines	293,376
	Other	34,260
	Insurance	1,551,282
	Casualty	116,782
	Property	49,501
	Reinsurance	166,283
Total due from reinsurers on unpaid claims		$	1,717,565

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(In thousands)		December 31, 2018
Loss reserve discount:
	Other liability	$	—
	Primary workers' compensation	—
	Excess workers' compensation	(434,302		)
	Professional liability	—
	Commercial automobile	—
	Short-tail lines	—
	Other	—
	Insurance	(434,302		)
	Casualty	(128,790		)
	Property	—
	Reinsurance	(128,790		)
Total loss reserve discount		$	(563,092	)
Total gross reserves for loss and loss expenses		$	11,966,448

The following is supplementary information regarding average historical claims duration as of December 31, 2018:

Insurance
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance
Years	1		2		3		4		5		6		7		8		9		10
Other liability	8.0	%	14.4	%	18.4	%	16.8	%	13.8	%	8.2	%	5.9	%	3.0	%	2.8	%	1.8	%
Primary workers' compensation	22.5	%	27.6	%	15.6	%	9.4	%	5.9	%	4.0	%	2.8	%	1.9	%	1.6	%	1.1	%
Excess workers' compensation	3.8	%	3.3	%	2.7	%	3.1	%	3.0	%	3.3	%	2.7	%	3.3	%	3.5	%	2.6	%
Professional liability	8.7	%	22.7	%	22.3	%	16.6	%	9.4	%	9.1	%	3.5	%	1.6	%	4.3	%	2.5	%
Commercial automobile	39.7	%	21.6	%	15.6	%	10.7	%	6.8	%	3.5	%	1.0	%	0.4	%	0.2	%	—	%
Short-tail lines	59.6	%	29.8	%	5.8	%	1.6	%	0.1	%	0.3	%	0.4	%	0.3	%	—	%	1.4	%
Reinsurance
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance
Years	1		2		3		4		5		6		7		8		9		10
Casualty	7.2	%	12.5	%	14.6	%	13.3	%	11.2	%	9.0	%	5.9	%	5.2	%	3.8	%	2.8	%
Property	35.3	%	32.3	%	14.8	%	5.5	%	3.9	%	2.0	%	3.2	%	2.7	%	—	%	3.2	%

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The table below provides a reconciliation of the beginning and ending reserve balances:

(In thousands)	2018			2017			2016
Net reserves at beginning of year	$	10,056,914		$	9,590,265		$	9,244,872
Net provision for losses and loss expenses:
Claims occurring during the current year (1)	3,926,489			3,963,543			3,826,620
Increase (decrease) in estimates for claims occurring in prior years (2)	6,831			(5,165		)	(29,904		)
Loss reserve discount accretion	41,382			43,970			49,084
Total	3,974,702			4,002,348			3,845,800
Net payments for claims:
Current year	964,808			1,027,405			1,052,452
Prior year	2,700,077			2,562,550			2,401,722
Total	3,664,885			3,589,955			3,454,174
Foreign currency translation	(117,848		)	54,256			(46,233		)
Net reserves at end of year	10,248,883			10,056,914			9,590,265
Ceded reserve at end of year	1,717,565			1,613,494			1,606,930
Gross reserves at end of year	$	11,966,448		$	11,670,408		$	11,197,195

_______________________________________

(1) Claims occurring during the current year are net of loss reserve discounts of $24,381,000, $22,064,000 and $18,929,000 in 2018, 2017, and 2016, respectively.

(2) The increase (decrease) in estimates for claims occurring in prior years is net of loss reserve discount. On an undiscounted basis, the estimates for claims occurring in prior years decreased by $3,738,000, $32,132,000 and $59,175,000 in 2018, 2017 and 2016, respectively.

Favorable prior year development (net of additional and return premiums) was $39 million in 2018.

Insurance - Reserves for the Insurance segment developed favorably by $43 million in 2018. The favorable development was primarily attributable to workers' compensation business, partially offset by unfavorable development for professional liability business.

For workers' compensation, the favorable development was spread across many accident years, including prior to 2009, but was most significant in accident years 2015 through 2017. The favorable workers' compensation development reflects a continuation during 2018 of the benign loss cost trends experienced during recent years, particularly the favorable claim frequency trends (i.e., number of reported claims per unit of exposure). The long term trend of declining workers' compensation frequency can be attributable to improved workplace safety. Loss severity trends were also aided by our continued investment in claims handling initiatives such as medical case management services and vendor savings through usage of preferred provider networks. Reported workers' compensation losses in 2018 continued to be better than our expectations at most of our operating units, and were below the assumptions underlying our previous reserve estimates.

For professional liability business, adverse development was primarily related to unexpected large directors and officers (“D&O”) liability losses at one of our U.S. operating units, as well as lawyers professional liability losses at another operating unit. The adverse development stemmed primarily from accident years 2015 and 2016, and was driven by a higher frequency of large losses than we had experienced in previous years.

Reinsurance - Reserves for the Reinsurance segment developed unfavorably by $4 million in 2018. The unfavorable development was primarily due to U.S. casualty facultative business from accident years 2009 and prior related to construction projects, and was largely offset by favorable development on assumed excess of loss workers compensation business.

89

Favorable prior year development (net of additional and return premiums) was $37 million in 2017.

Insurance - Reserves for the Insurance segment developed favorably by $68 million in 2017. The favorable development was primarily attributable to workers' compensation business, and was partially offset by unfavorable development for professional liability business.

For workers' compensation, the favorable development was related to both primary and excess business and was spread across many accident years, including those prior to 2008, but was most significant in accident years 2014 through 2016. The favorable workers' compensation development reflects a continuation during 2017 of the generally benign loss cost trends experienced in recent years, particularly the favorable claim frequency trends (i.e. number of reported claims per unit of exposure). Reported workers' compensation losses in 2017 continued to be better than our expectations at most of our operating units, and were below the assumptions underlying our previous reserve estimates. The favorable severity trends were also impacted by our continued investment in medical case management services and the higher usage of preferred provider networks. The long term trend of declining workers' compensation frequency can be attributed to improved workplace safety.

For professional liability business, adverse development was primarily related to unexpected large D&O liability losses at one of our U.S. operating units, and large professional indemnity and D&O losses in the U.K. The adverse development stemmed mainly from accident years 2013 through 2016 in the U.S. and 2011 through 2016 in the U.K.

Reinsurance - Reserves for the Reinsurance segment developed unfavorably by $31 million in 2017. This adverse development was due to reserve strengthening associated with claims impacted by the change in the Ogden discount rate in the U.K., as well as adverse development on the U.S. facultative casualty excess of loss business. The Ogden rate is the discount rate used to calculate lump-sum bodily injury payouts in the U.K., and was reduced by the U.K. Ministry of Justice from +2.5% to -0.75% in 2017; the adverse development mostly related to U.K. motor bodily injury claims which we reinsured on an excess of loss basis in accident years 2012 through 2016. The adverse development on U.S. facultative casualty business was due to construction related risks in accident years 2008 and prior.

Favorable prior year development (net of additional and return premiums) was $59 million in 2016.

    Insurance - Reserves for the Insurance segment developed favorably by $53 million in 2016. The favorable development was primarily related to workers' compensation business, and was partially offset by unfavorable development for medical professional liability business.

For workers' compensation, the favorable development was related to both primary and excess business and to many accident years, including those prior to 2007. During 2016, reported workers' compensation losses continued to be better than our expectations at most of our operating units. Loss frequency and severity trends continued to be better than the assumptions underlying our previous reserve estimates. Loss severity trends also benefited from our continued investment in medical case management services and from our preferred provider networks. The long term trend of declining workers' compensation frequency can be attributed to improved workplace safety.

For medical professional liability business, unfavorable development was primarily related to a class of business that has been discontinued. The adverse development for that business stemmed mainly from accident years 2010 through 2015.

Reinsurance - Reserves for the Reinsurance segment developed favorably by $6 million in 2016. The favorable development was primarily related to direct facultative reinsurance business and to accident years 2008 through 2014.

Environmental and Asbestos — To date, known environmental and asbestos claims have not had a material impact on the Company’s operations, because its subsidiaries generally did not insure large industrial companies that are subject to significant environmental or asbestos exposures prior to 1986 when an absolute exclusion was incorporated into standard policy language.

The Company’s net reserves for losses and loss expenses relating to asbestos and environmental claims on policies written before adoption of the absolute exclusion was $28 million at December 31, 2018 and $30 million at December 31, 2017. The estimation of these liabilities is subject to significantly greater than normal variation and uncertainty because it is difficult to make an actuarial estimate of these liabilities due to the absence of a generally accepted actuarial methodology for these exposures and the potential effect of significant unresolved legal matters, including coverage issues, as well as the cost of litigating the legal issues. Additionally, the determination of ultimate damages and the final allocation of such damages to financially responsible parties are highly uncertain.

Discounting — The Company discounts its liabilities for certain workers’ compensation reserves. The amount of workers’ compensation reserves that were discounted was $1,793 million and $1,855 million at December 31, 2018 and 2017, respectively. The aggregate net discount for those reserves, after reflecting the effects of ceded reinsurance, was $563 million and $591 million at

90

December 31, 2018 and 2017, respectively. At December 31, 2018, discount rates by year ranged from 2.0% to 6.5%, with a weighted average discount rate of 3.8%.

Substantially all discounted workers’ compensation reserves (97% of total discounted reserves at December 31, 2018) are excess workers’ compensation reserves. In order to properly match loss expenses with income earned on investment securities supporting the liabilities, reserves for excess workers’ compensation business are discounted using risk-free discount rates determined by reference to the U.S. Treasury yield curve. These rates are determined annually based on the weighted average rate for the period. Once established, no adjustments are made to the discount rate for that period, and any increases or decreases in loss reserves in subsequent years are discounted at the same rate, without regard to when any such adjustments are recognized. The expected loss and loss expense payout patterns subject to discounting are derived from the Company’s loss payout experience.  

The Company also discounts reserves for certain other long-duration workers’ compensation reserves (representing approximately 3% of total discounted reserves at December 31, 2018), including reserves for quota share reinsurance and reserves related to losses regarding occupational lung disease. These reserves are discounted at statutory rates prescribed or permitted by the Department of Insurance of the State of Delaware.

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(14)    Reinsurance

The Company reinsures a portion of its insurance exposures in order to reduce its net liability on individual risks and catastrophe losses. Reinsurance coverage and retentions vary depending on the line of business, location of the risk and nature of loss. The Company’s reinsurance purchases include the following: property reinsurance treaties that reduce exposure to large individual property losses and catastrophe events; casualty reinsurance treaties that reduce its exposure to large individual casualty losses, workers’ compensation catastrophe losses and casualty losses involving multiple claimants or insureds; and facultative reinsurance that reduces exposure on individual policies or risks for losses that exceed treaty reinsurance capacity. Depending on the operating unit, the Company purchases specific additional reinsurance to supplement the above programs.

The following is a summary of reinsurance financial information:

(In thousands)	2018			2017			2016
Written premiums:
Direct	$	6,973,216		$	6,726,029		$	6,647,600
Assumed	729,278			750,934			896,101
Ceded	(1,269,267		)	(1,216,455		)	(1,119,788		)
Total net written premiums	$	6,433,227		$	6,260,508		$	6,423,913
Earned premiums:
Direct	$	6,851,795		$	6,661,046		$	6,492,240
Assumed	755,759			812,309			900,570
Ceded	(1,236,049		)	(1,161,936		)	(1,099,462		)
Total net earned premiums	$	6,371,505		$	6,311,419		$	6,293,348
Ceded losses and loss expenses incurred	$	829,742		$	601,769		$	707,336
Ceded commission earned	$	268,037		$	241,983		$	201,957

The Company reinsures a portion of its exposures principally to reduce its net liability on individual risks and to protect against catastrophic losses. Estimated amounts due from reinsurers are reported net of reserves for uncollectible reinsurance of $946,965, $1,010,000 and $1,049,000 as of December 31, 2018, 2017 and 2016, respectively.

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The following table presents the amounts due from reinsurers as of December 31, 2018:

(In thousands)
Lloyd’s of London	$	215,370
Munich Re	164,131
Alleghany Group	150,438
Swiss Re	150,280
Partner Re	103,837
Berkshire Hathaway	87,314
Axis Capital	85,377
Hannover Re Group	77,351
Everest Re	62,113
Korean Re	52,746
Renaissance Re	39,944
Liberty Mutual	32,118
Qatar Re GRP	27,731
Chubb Limited	24,628
Arch Capital Group	21,260
Other reinsurers less than $20,000	289,305
Subtotal	1,583,943
Residual market pools	348,348
Total	$	1,932,291

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(15)    Indebtedness

Indebtedness consisted of the following as of December 31, 2018 (the difference between the face value and the carrying value is unamortized discount and debt issuance costs):

				Carrying Value
(In thousands)	Interest Rate	Face Value		2018		2017
Senior notes due on:
August 15, 2019	6.15%	$	140,651	$	140,568	$	140,434
September 15, 2019	7.375%	300,000		299,816		299,562
September 15, 2020	5.375%	300,000		299,420		299,083
January 1, 2022	8.7%	76,503		76,273		76,210
March 15, 2022	4.625%	350,000		348,670		348,252
February 15, 2037	6.25%	250,000		248,006		247,896
August 1, 2044	4.75%	350,000		345,283		345,099
Subsidiary debt (1) (2)	Various	123,992		123,992		12,516
Total senior notes and other debt		$	1,891,146	$	1,882,028	$	1,769,052
Subordinated debentures due on:
April 30, 2053	5.625%	$	350,000	$	341,097	$	340,838
March 1, 2056	5.9%	110,000		106,159		106,055
June 1, 2056	5.75%	290,000		281,551		281,325
March 30, 2058	5.70%	185,000		178,684		—
Total subordinated debentures		$	935,000	$	907,491	$	728,218

________________

(1) Subsidiary debt is due as follows: $7 million in 2019, $15 million in 2020, and $102 million in 2028.

(2) Includes non-recourse loan in the amount of $102 million secured by an office building. See Note 8, Real Estate, for more details.

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(16)    Income Taxes

Income tax expense (benefit) consists of:

(In thousands)	Current Expense (Benefit)		Deferred Expense (Benefit)			Total
December 31, 2018
Domestic	$	188,712	$	(63,134	)	$	125,578
Foreign	13,963		23,487			37,450
Total expense (benefit)	$	202,675	$	(39,647	)	$	163,028
December 31, 2017
Domestic	$	225,694	$	(27,601	)	$	198,093
Foreign	8,803		12,537			21,340
Total expense (benefit)	$	234,497	$	(15,064	)	$	219,433
December 31, 2016
Domestic	$	259,539	$	3,355		$	262,894
Foreign	23,634		6,425			30,059
Total expense	$	283,173	$	9,780		$	292,953

Income before income taxes from domestic operations was $755 million, $797 million and $837 million for the years ended December 31, 2018, 2017 and 2016, respectively. Income (loss) before income taxes from foreign operations was $57 million, ($25) million and $59 million for the years ended December 31, 2018, 2017 and 2016, respectively.

A reconciliation of the income tax expense and the amounts computed by applying the Federal and foreign income tax rate of 21% for 2018 and 35% for 2017 and 2016 to pre-tax income are as follows:

(In thousands)	2018			2017			2016
Computed “expected” tax expense	$	170,540		$	270,470		$	313,753
Tax-exempt investment income	(18,833		)	(37,209		)	(37,379		)
Change in valuation allowance	18,576			11,161			1,420
Impact of foreign tax rates	7,683			3,508			1,984
State and local taxes	3,901			1,644			7,748
Impact of change in U.S. tax rate	(10,950		)	(30,531		)	—
Other, net	(7,889		)	390			5,427
Total expense	$	163,028		$	219,433		$	292,953

95

At December 31, 2018 and 2017, the tax effects of differences that give rise to significant portions of the deferred tax asset and deferred tax liability are as follows:

(In thousands)	2018			2017
Deferred tax asset:
Loss reserve discounting	$	130,513		$	70,206
Unearned premiums	112,190			110,854
Net operating losses	37,463			33,043
Other-than-temporary impairments	9,910			8,204
Employee compensation plans	56,027			59,037
Other	58,809			49,346
Gross deferred tax asset	404,912			330,690
Less valuation allowance	(35,195		)	(16,619		)
Deferred tax asset	369,717			314,071
Deferred tax liability:
Amortization of intangibles	13,641			12,826
Loss reserve discounting - transition rule	41,088			—
Deferred policy acquisition costs	99,293			100,020
Unrealized investment gains	35,430			151,162
Property, furniture and equipment	39,239			31,865
Investment funds	51,712			41,104
Other	53,824			63,858
Deferred tax liability	334,227			400,835
Net deferred tax (asset) liability	$	(35,490	)	$	86,764

The Company had a current tax receivable of $0.7 million and a payable of $11.3 million at December 31, 2018 and 2017, respectively. At December 31, 2018, the Company had foreign net operating loss carryforwards of $8.8 million that expire beginning in 2027, and an additional $181.0 million that have no expiration date. At December 31, 2018, the Company had a valuation allowance of $35.2 million, as compared to $16.6 million at December 31, 2017. The Company has provided a valuation allowance against the utilization of foreign tax credits and the future net operating loss carryforward benefits of certain foreign operations. The statute of limitations has closed for the Company’s U.S. Federal tax returns through December 31, 2013.

The realization of the deferred tax asset is dependent upon the Company’s ability to generate sufficient taxable income in future periods. Based on historical results and the prospects for future current operations, management anticipates that it is more likely than not that future taxable income will be sufficient for the realization of this asset.

The Tax Cuts and Jobs Act of 2017 (the "Tax Act") was enacted on December 22, 2017. The Tax Act provides for a reduction of the U.S. corporate income tax rate from 35% to 21% effective January 1, 2018. In 2018, the Company reported a net tax rate reduction benefit in the amount of $11.0 million. Additionally, the U.S. tax law requires insurance reserves to be discounted for tax purposes. The Tax Act modified this computation. At the end of 2018, the IRS issued revised discount factors to be applied to the 2017 reserves. This increased the beginning of year 2018 deferred tax asset for loss reserve discounting by $47 million. Under the related transition rule, a deferred tax liability was established which will be included in taxable income over eight years beginning in 2018.

The Tax Act included a global intangible low-taxed income tax ("GILTI"). The Company has made an accounting policy election to treat any GILTI taxes as a current period expense when incurred (the "period cost method"). The 2018 tax provision includes a GILTI tax of $2.8 million as a current tax expense.

The Company has not provided U.S. deferred income taxes on the undistributed earnings of approximately $70 million of its non-U.S. subsidiaries since these earnings are intended to be permanently reinvested in the non-U.S. subsidiaries. In the future, if such earnings were distributed the Company projects that the incremental tax, if any, will be immaterial.

96

(17)    Dividends from Subsidiaries and Statutory Financial Information

The Company’s insurance subsidiaries are restricted by law as to the amount of dividends they may pay without the approval of regulatory authorities. The Company’s lead insurer, Berkley Insurance Company ("BIC"), directly or indirectly owns all of the Company’s other insurance companies. During 2019, the maximum amount of dividends that can be paid by BIC without such approval is approximately $1.1 billion.

BIC’s combined net income and statutory capital and surplus, as determined in accordance with statutory accounting practices (SAP), are as follows:

(In thousands)	2018		2017		2016
Net income	$	1,099,953	$	698,862	$	702,830
Statutory capital and surplus	$	5,587,930	$	5,479,603	$	5,493,044

The significant variances between SAP and GAAP are that for statutory purposes bonds are carried at amortized cost, unrealized gains and losses on equity securities are recorded in surplus, acquisition costs are charged to income as incurred, deferred Federal income taxes are subject to limitations, excess and assumed workers’ compensation reserves are discounted at different discount rates and certain assets designated as “non-admitted assets” are charged against surplus. The Commissioner of Insurance of the State of Delaware has allowed BIC to discount non-tabular workers' compensation loss reserves, which is a permitted practice that differs from SAP. The effect of using this permitted practice was an increase to BIC’s statutory capital and surplus by $282 million at December 31, 2018.

The National Association of Insurance Commissioners (“NAIC”) has risk-based capital (“RBC”) requirements that require insurance companies to calculate and report information under a risk-based formula which measures statutory capital and surplus needs based on a regulatory definition of risk in a company’s mix of products and its balance sheet. This guidance is used to calculate two capital measurements: Total Adjusted Capital and RBC Authorized Control Level. Total Adjusted Capital is equal to the Company’s statutory capital and surplus excluding capital and surplus derived from the use of permitted practices that differ from statutory accounting practices. RBC Authorized Control Level is the capital level used by regulatory authorities to determine whether remedial action is required. Generally, no remedial action is required if Total Adjusted Capital is 200% or more of the RBC Authorized Control Level. At December 31, 2018, BIC’s Total Adjusted Capital of $5.306 billion was 384% of its RBC Authorized Control Level.

See Note 3, Investments in Fixed Maturity Securities, for a description of assets held on deposit as security.

97

(18)    Common Stockholders’ Equity

The weighted average number of shares used in the computation of net income per share was as follows:

	2018	2017	2016
Basic	126,698,927	124,843,240	122,650,997
Diluted	128,263,558	129,017,613	128,552,838

Treasury shares have been excluded from average outstanding shares from the date of acquisition. The weighted average number of basic shares outstanding includes the impact of 4,926,521 common shares held in a grantor trust. The common shares held in the grantor trust are for delivery upon settlement of vested but mandatorily deferred restricted stock units ("RSUs"). Shares held by the grantor trust do not affect diluted shares outstanding since shares deliverable under vested RSUs were already included in diluted shares outstanding. The difference in calculating basic and diluted net income per share is attributable entirely to the dilutive effect of stock-based compensation plans. Changes in shares of common stock outstanding, net of treasury shares, are presented below. Shares of common stock issued and outstanding do not include shares related to unissued restricted stock units (including shares held in the grantor trust).

	2018		2017		2016
Balance, beginning of year	121,514,852		121,193,599		123,307,837
Shares issued	838,508		1,052,256		281,654
Shares repurchased	(357,600	)	(731,003	)	(2,395,892)
Balance, end of year	121,995,760		121,514,852		121,193,599

The amount of dividends paid is dependent upon factors such as the receipt of dividends from our subsidiaries, our results of operations, cash flow, financial condition and business needs, the capital and surplus requirements of our subsidiaries, and applicable insurance regulations that limit the amount of dividends that may be paid by our regulated insurance subsidiaries.

(19)    Fair Value of Financial Instruments

The following table presents the carrying amounts and estimated fair values of the Company’s financial instruments as of December 31, 2018 and 2017:

	2018				2017
(In thousands)	Carrying Value		Fair Value		Carrying Value		Fair Value
Assets:
Fixed maturity securities	$	13,606,812	$	13,619,620	$	13,551,250	$	13,566,976
Equity securities	279,006		279,006		576,647		576,647
Arbitrage trading account	452,548		452,548		617,649		617,649
Loans receivable	94,813		97,073		79,684		82,047
Cash and cash equivalents	817,602		817,602		950,471		950,471
Trading accounts receivable from brokers and clearing organizations	347,228		347,228		189,280		189,280
Liabilities:
Due to broker	20,144		20,144		15,920		15,920
Trading account securities sold but not yet purchased	38,120		38,120		64,358		64,358
Subordinated debentures	907,491		840,002		728,218		769,060
Senior notes and other debt	1,882,028		1,968,996		1,769,052		1,945,313

The estimated fair values of the Company’s fixed maturity securities, equity securities available for sale and arbitrage trading account securities are based on various valuation techniques that rely on fair value measurements as described in Note 12 above. The fair value of loans receivable is estimated by using current institutional purchaser yield requirements for loans with similar credit characteristics, which is considered a Level 2 input. The fair value of the senior notes and other debt and the subordinated debentures is based on spreads for similar securities, which is considered a Level 2 input.

98

(20)    Lease Obligations

The Company and its subsidiaries use office space and equipment under leases expiring at various dates. These leases are considered operating leases for financial reporting purposes. Some of these leases have options to extend the length of the leases and contain clauses for cost of living, operating expense and real estate tax adjustments. Future minimum lease payments, without provision for sublease income, are: $46,592,000 in 2019; $43,504,000 in 2020; $39,061,000 in 2021; $34,444,000 in 2022, $30,881,000 in 2023 and $75,740,000 thereafter. Rental expense was $45,778,000, $52,925,000, and $47,453,000 for 2018, 2017, and 2016 respectively.

(21)    Commitments, Litigation and Contingent Liabilities

In the ordinary course of business, the Company is subject to disputes, litigation and arbitration arising from its insurance and reinsurance businesses. These matters are generally related to insurance and reinsurance claims and are considered in the establishment of loss and loss expense reserves. In addition, the Company may also become involved in legal actions which seek extra-contractual damages, punitive damages or penalties, including claims alleging bad faith in handling of insurance claims. The Company expects its ultimate liability with respect to such matters will not be material to its financial condition. However, adverse outcomes on such matters are possible, from time to time, and could be material to the Company’s results of operations in any particular financial reporting period.

At December 31, 2018, the Company had commitments to invest up to $270.2 million and $253.4 million in certain investment funds and real estate construction projects, respectively.

(22)    Stock Incentive Plan

Pursuant to the Company's stock incentive plan, the Company may issue restricted stock units ("RSUs") to employees of the Company and its subsidiaries. The RSUs generally vest three to five years from the award date and are subject to other vesting and forfeiture provisions contained in the award agreement. The following table summarizes RSU information for the three years ended December 31, 2018:

	2018		2017		2016
RSUs granted and unvested at beginning of period:	3,477,981		4,862,098		4,158,325
Granted	760,032		855,984		1,000,559
Vested	(600,169	)	(1,993,507	)	(77,250	)
Canceled	(263,411	)	(246,594	)	(219,536	)
RSUs granted and unvested at end of period:	3,374,433		3,477,981		4,862,098

Upon vesting, shares of the Company’s common stock equal to the number of vested RSUs are issued or deferred to a later date, depending on the terms of the specific award agreement. As of December 31, 2018, 4,709,318 RSUs had been deferred. RSUs that have not yet vested and vested RSUs that have been deferred are not considered to be issued and outstanding shares.

The fair value of RSUs at the date of grant are recorded as unearned compensation, a component of stockholders’ equity, and expensed over the vesting period. Following is a summary of changes in unearned compensation for the three years ended December 31, 2018:

(In thousands)	2018			2017			2016
Unearned compensation at beginning of year	$	122,910		$	115,965		$	103,538
RSUs granted, net of cancellations	52,204			52,897			52,697
RSUs expensed	(34,408		)	(38,796		)	(35,585		)
RSUs forfeitures	(11,037		)	(7,156		)	(4,685		)
Unearned compensation at end of year	$	129,669		$	122,910		$	115,965

99

(23)    Compensation Plans

The Company and its subsidiaries have profit sharing plans in which substantially all employees participate. The plans provide for minimum annual contributions of 5% of eligible compensation; contributions above the minimum are discretionary and vary with each participating subsidiary’s profitability. Employees become eligible to participate in the plan on the first day of the calendar quarter following the first full calendar quarter after the employee's date of hire provided the employee has completed 250 hours of service during the calendar quarter. The plans provide that 40% of the contributions vest immediately and that the remaining 60% vest at varying percentages based upon years of service. Profit sharing expense was $42 million, $42 million and $39 million in 2018, 2017 and 2016, respectively.

The Company has a long-term incentive compensation plan ("LTIP") that provides for compensation to key executives based on the growth in the Company's book value per share over a five year period.

The following table summarizes the outstanding LTIP awards as of December 31, 2018:

	Units Outstanding	Maximum Value		Inception to date earned through December 31, 2018 on outstanding units
2014 grant	181,750	$	18,175,000	$	15,328,795
2015 grant	194,750	19,475,000		15,272,295
2016 grant	217,500	21,750,000		12,371,400
2017 grant	223,250	22,325,000		7,822,680
2018 grant	222,750	22,750,000		4,316,895

The following table summarizes the LTIP expense for each of the three years ended December 31, 2018:

(In thousands)	2018			2017		2016
2011 grant	$	—		$	—	$	(82	)
2013 grant	(1,124		)	7,667		8,918
2014 grant	3,227			3,167		3,503
2015 grant	5,170			3,667		4,072
2016 grant	5,148			3,601		4,002
2017 grant	4,700			3,162		—
2018 grant	4,317			—		—
Total	$	21,438		$	21,264	$	20,413

(24)    Supplemental Financial Statement Data

Other operating costs and expenses consist of the following:

(In thousands)	2018			2017		2016
Amortization of deferred policy acquisition costs	$	915,246		$	1,111,489	$	1,155,954
Insurance operating expenses	1,183,635			989,535		933,249
Insurance service expenses	118,357			129,776		138,908
Net foreign currency (gains) losses	(27,067		)	15,267		(11,904		)
Other costs and expenses	193,050			190,865		179,412
Total	$	2,383,221		$	2,436,932	$	2,395,619

100

(25)    Industry Segments

The Company’s reportable segments include the following two business segments, plus a corporate segment:

• Insurance - predominantly commercial insurance business, including excess and surplus lines, admitted lines and specialty personal lines throughout the United States, as well as insurance business in the United Kingdom, Continental Europe, South America, Canada, Mexico, Scandinavia, Asia and Australia.

• Reinsurance - reinsurance business on a facultative and treaty basis, primarily in the United States, United Kingdom, Continental Europe, Australia, the Asia-Pacific region and South Africa.

The accounting policies of the segments are the same as those described in the summary of significant accounting policies. Income tax expense and benefits are calculated based upon the Company’s overall effective tax rate.

Summary financial information about the Company’s reporting segments is presented in the following table. Income before income taxes by segment includes allocated investment income. Identifiable assets by segment are those assets used in or allocated to the operation of each segment.

	Revenues
(In thousands)	Earned Premiums		Investment Income		Other		Total (1)		Pre-Tax Income (Loss)			Net Income (Loss) to Common Stockholders
Year ended December 31, 2018
Insurance	$	5,864,981	$	518,733	$	72,727	$	6,456,441	$	856,011		$	682,028
Reinsurance	506,524		94,291		—		600,815		62,144			50,144
Corporate, other and eliminations (2)	—		61,211		418,696		479,907		(260,549		)	(213,469		)
Net investment gains	—		—		154,488		154,488		154,488			122,046
Consolidated	$	6,371,505	$	674,235	$	645,911	$	7,691,651	$	812,094		$	640,749
Year ended December 31, 2017
Insurance	$	5,706,443	$	436,178	$	86,864	$	6,229,485	$	756,153		$	535,186
Reinsurance	604,976		91,146		—		696,122		(15,276		)	(5,131		)
Corporate, other and eliminations (2)	—		48,464		374,835		423,299		(303,965		)	(199,269		)
Net investment gains	—		—		335,858		335,858		335,858			218,308
Consolidated	$	6,311,419	$	575,788	$	797,557	$	7,684,764	$	772,770		$	549,094
Year ended December 31, 2016
Insurance	$	5,618,842	$	431,489	$	97,879	$	6,148,210	$	799,139		$	534,613
Reinsurance	674,506		102,617		—		777,123		98,277			68,400
Corporate, other and eliminations (2)	—		30,057		431,789		461,846		(267,983		)	(174,650		)
Net investment gains	—		—		267,005		267,005		267,005			173,553
Consolidated	$	6,293,348	$	564,163	$	796,673	$	7,654,184	$	896,438		$	601,916

101

Identifiable Assets
(In thousands)	December 31,
	2018		2017
Insurance	$	19,634,329	$	19,263,193
Reinsurance	2,951,115		3,169,731
Corporate, other and eliminations (2)	2,310,533		1,866,993
Consolidated	$	24,895,977	$	24,299,917

_______________________________________

(1) Revenues for Insurance includes $714.2 million, $688.2 million and $733.3 million in 2018, 2017 and 2016, respectively, from foreign countries. Revenues for Reinsurance includes $228.1 million, $201.3 million and $200.5 million in 2018, 2017 and 2016, respectively, from foreign countries.

(2) Corporate, other and eliminations represent corporate revenues and expenses and other items that are not allocated to business segments.

Net premiums earned by major line of business are as follows:

(In thousands)	2018		2017		2016
Insurance
Other liability	$	1,912,071	$	1,843,826	$	1,761,748
Workers' compensation	1,489,805		1,481,507		1,402,611
Short-tail lines	1,184,755		1,149,977		1,237,917
Commercial automobile	722,236		685,263		684,626
Professional liability	556,114		545,870		531,940
Total Insurance	5,864,981		5,706,443		5,618,842
Reinsurance
Casualty	362,886		377,650		405,470
Property	143,638		227,326		269,036
Total Reinsurance	506,524		604,976		674,506
Total	$	6,371,505	$	6,311,419	$	6,293,348

102

(26)    Quarterly Financial Information (Unaudited)

The following is a summary of quarterly financial data:

(In thousands, except per share data)	2018
Three months ended	March 31		June 30		September 30		December 31
Revenues	$	1,891,247	$	1,910,916	$	1,937,902	$	1,951,586
Net income	166,397		180,075		161,920		132,357
Net income per share (1)
Basic (2)	1.32		1.42		1.28		1.04
Diluted	1.30		1.40		1.26		1.03

	2017
Three months ended	March 31		June 30		September 30		December 31
Revenues	$	1,870,418	$	1,848,049	$	2,031,342	$	1,934,956
Net income	123,447		109,004		162,054		154,589
Net income per share (1)
Basic (2)	1.01		0.87		1.29		1.22
Diluted	0.96		0.85		1.26		1.21

_______________________________________

(1) Net income per share (“EPS”) in each quarter is computed using the weighted-average number of shares outstanding during that quarter, while EPS for the full year is computed using the weighted-average number of shares outstanding during the year. Thus, the sum of the four quarters EPS does not necessarily equal the full-year EPS.

(2) Basic shares outstanding includes shares held in a grantor trust.

(27)    Subsequent Event

On February 21, 2019, the Company announced that its Board of Directors approved a 3-for-2 common stock split to be paid in the form of a stock dividend to holders of record on March 14, 2019. The additional shares are expected to be issued on April 2, 2019.

103

ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE

None.

ITEM 9A. CONTROLS AND PROCEDURES

The Company's management, including its Chief Executive Officer and Chief Financial Officer, have conducted an evaluation of the effectiveness of the Company's disclosure controls and procedures pursuant to Exchange Act Rule 13a-15(b) as of the end of the period covered by this annual report. Based on that evaluation, the Chief Executive Officer and Chief Financial Officer concluded that the Company has in place effective controls and procedures designed to ensure that information required to be disclosed by the Company in the reports it files or submits under the Exchange Act and the rules thereunder, is recorded, processed, summarized and reported within the time periods specified in the Commission's rules and forms.

During the quarter ended December 31, 2018, there have been no changes in our internal controls over financial reporting that have materially affected, or are reasonably likely to materially affect, our internal controls over financial reporting.

Management's Report On Internal Control Over Financial Reporting

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

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

Our management is responsible for establishing and maintaining adequate internal control over financial reporting. Under the supervision and with the participation of our management, including our principal executive officer and principal financial officer, we conducted an evaluation of the effectiveness of our internal control over financial reporting based on the framework in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of Treadway Commission. Based on our evaluation under the framework in Internal Control - Integrated Framework, our management concluded that our internal control over financial reporting was effective as of December 31, 2018.

104

Report of Independent Registered Public Accounting Firm

To the Stockholders and Board of Directors

W. R. Berkley Corporation:

Opinion on Internal Control Over Financial Reporting

We have audited W. R. Berkley Corporation and Subsidiaries’ (the “Company”) internal control over financial reporting as of December 31, 2018, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission. In our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2018, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (“PCAOB”), the consolidated balance sheets of the Company as of December 31, 2018 and 2017, the related consolidated statements of income, comprehensive income, stockholders’ equity, and cash flows for each of the years in the three-year period ended December 31, 2018, and the related notes and financial statement schedules II to VI (collectively, the "consolidated financial statements”), and our report dated February 22, 2019 expressed an unqualified opinion on those consolidated financial statements.

Basis for Opinion

The Company’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying Managements’s Report on Internal Control over Financial Reporting. Our responsibility is to express an opinion on the Company’s internal control over financial reporting based on our audit. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

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

Definition and Limitations of Internal Control Over Financial Reporting

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

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

/S/ KPMG LLP

New York, New York

February 22, 2019

105

ITEM 9B. OTHER INFORMATION

None.

106

PART III

ITEM 10. DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE

Reference is made to the registrant's definitive proxy statement, which will be filed with the Securities and Exchange Commission within 120 days after December 31, 2018, and which is incorporated herein by reference.

ITEM 11. EXECUTIVE COMPENSATION

Reference is made to the registrant's definitive proxy statement, which will be filed with the Securities and Exchange Commission within 120 days after December 31, 2018, and which is incorporated herein by reference.

ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS

(a) Security ownership of certain beneficial owners

Reference is made to the registrant's definitive proxy statement, which will be filed with the Securities and Exchange Commission within 120 days after December 31, 2018, and which is incorporated herein by reference.

(b) Security ownership of management

Reference is made to the registrant's definitive proxy statement, which will be filed with the Securities and Exchange Commission within 120 days after December 31, 2018, and which is incorporated herein by reference.

(c) Changes in control

Reference is made to the registrant's definitive proxy statement, which will be filed with the Securities and Exchange Commission within 120 days after December 31, 2018, and which is incorporated herein by reference.

(d) Equity compensation plan information

Reference is made to the registrant's definitive proxy statement, which will be filed with the Securities and Exchange Commission within 120 days after December 31, 2018, and which is incorporated herein by reference.

ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE

Reference is made to the registrant's definitive proxy statement, which will be filed with the Securities and Exchange Commission within 120 days after December 31, 2018, and which is incorporated herein by reference.

ITEM 14. PRINCIPAL ACCOUNTING FEES AND SERVICES

Reference is made to the registrant's definitive proxy statement, which will be filed with the Securities and Exchange Commission within 120 days after December 31, 2018, and which is incorporated herein by reference.

107

PART IV

ITEM 15. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES

(a) Index to Financial Statements

The schedules to the consolidated financial statements listed below should be read in conjunction with the consolidated financial statements included in this Annual Report on Form 10-K. Financial statement schedules not included in this Annual Report on Form 10-K have been omitted because they are not applicable or required information is shown in the financial statements or notes thereto.

Index to Financial Statement Schedules	Page
Schedule II — Condensed Financial Information of Registrant	114
Schedule III — Supplementary Insurance Information	118
Schedule IV — Reinsurance	119
Schedule V — Valuation and Qualifying Accounts	120
Schedule VI — Supplementary Information Concerning Property — Casualty Insurance Operations	121

108

(b) Exhibits

EXHIBITS

Number
(3.1)	The Company’s Restated Certificate of Incorporation, as amended through May 10, 2004 (incorporated by reference to Exhibits 3.1 and 3.2 of the Company’s Quarterly Report on Form 10-Q (File No. 1-15202) filed with the Commission on August 6, 2003).
(3.2)	Amendment, dated May 11, 2004, to the Company’s Restated Certificate of Incorporation, as amended (incorporated by reference to Exhibit 3.2 of the Company’s Quarterly report on Form 10-Q (File No. 1-15202) filed with the Commission on August 5, 2004).
(3.3)	Amendment, dated May 16, 2006, to the Company’s Restated Certificate of Incorporation, as amended (incorporated by reference to Exhibit 3.2 of the Company’s Current Report on Form 8-K (File No. 1-15202) filed with the Commission on May 17, 2006).
(3.4)	Amended and Restated By-Laws (incorporated by reference to Exhibit 3 (ii) of the Company’s Current Report on Form 8-K (File No. 1-15202) filed with the Commission on August 5, 2015).
(4.1)	Indenture, dated as of February 14, 2003, between the Company and The Bank of New York, as trustee (incorporated by reference to Exhibit 4.1 of the Company’s Annual Report on Form 10-K (File No. 1-15202) filed with the Commission of March 31, 2003).
(4.2)	Third Supplemental Indenture, dated as of August 24, 2004, between the Company and The Bank of New York, as Trustee, relating to $150,000,000 principal amount of the Company’s 6.150% Senior Notes due 2019, including form of the Notes as Exhibit A (incorporated by reference to Exhibit 4.4 of the Company’s Annual Report on Form 10-K (File No. 1-15202) filed with the Commission on March 14, 2005).
(4.3)	Fifth Supplemental Indenture, dated as of February 9, 2007, between the Company and The Bank of New York, as Trustee, relating to $250,000,000 principal amount of the Company’s 6.25% Senior Notes due 2037, including form of the Notes as Exhibit A (incorporated by reference to Exhibit 4.7 of the Company’s Annual Report on Form 10-K (File No. 1-15202) filed with the Commission on March 1, 2007).
(4.4)	Sixth Supplemental Indenture, dated as of September 14, 2009, between the Company and The Bank of New York Mellon, as Trustee, relating to $300,000,000 principal amount of the Company’s 7.375% Senior Notes due 2019, including form of the Notes as Exhibit A (incorporated by reference to Exhibit 4.7 of the Company’s Annual Report on Form 10-K (File No. 1-15202) filed with the Commission on February 26, 2010).
(4.5)	Seventh Supplemental Indenture, dated as of September 16, 2010, between the Company and The Bank of New York Mellon, as Trustee, relating to $300,000,000 principal amount of the Company’s 5.375% Senior Notes due 2020, including form of the Notes as Exhibit A (incorporated by reference to Exhibit 4.2 of the Company’s Current Report on Form 8-K (File No. 1-15202) filed with the Commission on September 16, 2010).
(4.6)	Eighth Supplemental Indenture, dated as of March 16, 2012, between the Company and The Bank of New York Mellon, as Trustee, relating to $350,000,000 principal amount of the Company’s 4.625% Senior Notes due 2022, including form of the Notes as Exhibit A (incorporated by reference to Exhibit 4.2 of the Company's Current Report on Form 8-K (File No. 1-15202) filed with the Commission on March 16, 2012).
(4.7)	Ninth Supplemental Indenture, dated as of August 6, 2014, between the Company and The Bank of New York Mellon, as Trustee, relating to $350,000,000 principal amount of the Company’s 4.75% Senior Notes due 2044, including form of the Notes as Exhibit A (incorporated by reference to Exhibit 4.2 of the Company's Current Report on Form 8-K (File No. 1-15202) filed with the Commission on August 6, 2014).
(4.8)	Subordinated Indenture, dated as of May 2, 2013, between the Company and The Bank of New York Mellon, as Trustee (incorporated by reference to Exhibit 4.1 of the Company's Current Report on Form 8-K (File No. 1-15202) filed with the Commission on May 2, 2013).
(4.9)	First Supplemental Indenture, dated as of May 2, 2013, between the Company and The Bank of New York Mellon, as Trustee, relating to $350,000,000 principal amount of the Company's 5.625% Subordinated Debentures due 2053, including the form of the Securities as Exhibit A (incorporated by reference to Exhibit 4.2 of the Company's Current Report on Form 8-K (File No. 1-15202) filed with the Commission on May 2, 2013).

109

(4.10)	Subordinated Indenture, dated as of March 1, 2016, between the Company and The Bank of New York Mellon, as Trustee (incorporated by reference to Exhibit 4.1 of the Company's Current Report on Form 8-K (File No. 1-15202) filed with the Commission on March 1, 2016).
(4.11)	First Supplemental Indenture, dated as of March 1, 2016, between the Company and The Bank of New York Mellon, as Trustee, relating to $110,000,000 principal amount of the Company's 5.9% Subordinated Debentures due 2056, including the form of the Securities as Exhibit A (incorporated by reference to Exhibit 4.2 of the Company's Current Report on Form 8-K (File No. 1-15202) filed with the Commission on March 1, 2016).
(4.12)	Second Supplemental Indenture, dated as of May 25, 2016, between the Company and The Bank of New York Mellon, as Trustee, relating to $290,000,000 principal amount of the Company's 5.75% Subordinated Debentures due 2056, including the form of the Securities as Exhibit A (incorporated by reference to Exhibit 4.2 of the Company's Current Report on Form 8-K (File No. 1-15202) filed with the Commission on May 25, 2016).
(4.13)	Subordinated Indenture, dated as of March 26, 2018, between the Company and The Bank of New York Mellon, as Trustee (incorporated by reference to Exhibit 4.1 of the Company’s Current Report on Form 8-K (File No. 1-15202) filed with the Commission on March 26, 2018).
(4.14)	First Supplemental Indenture, dated as of March 26, 2018, between the Company and The Bank of New York Mellon, as Trustee, relating to $175,000,000 principal amount of the Company’s 5.7% Subordinated Debentures due 2058, including the form of the Securities as Exhibit A (incorporated by reference to Exhibit 4.2 of the Company’s Current Report on Form 8-K (File No. 1-15202) filed with the Commission on March 26, 2018).
(4.15)	The instruments defining the rights of holders of the other long term debt securities of the Company are omitted pursuant to Section (b)(4)(iii)(A) of Item 601 of Regulation S-K. The Company agrees to furnish supplementally copies of these instruments to the Commission upon request.
(10.1)	W. R. Berkley Corporation 2012 Stock Incentive Plan (incorporated by reference to Annex A of the Company’s 2015 Proxy Statement (File No. 1-15202) filed with the Commission on April 20, 2015).
(10.2)	W. R. Berkley Corporation 2018 Stock Incentive Plan (incorporated by reference to Annex A of the Company’s 2018 Proxy Statement (File No. 1-15202) filed with the Commission on April 19, 2018).
(10.3)	Form of 2014 Performance-Based Restricted Stock Unit Agreement under the W. R. Berkley Corporation 2012 Stock Incentive Plan (incorporated by reference to Exhibit 10.1 of the Company's Quarterly Report on Form 10-Q (File No. 1-15202) filed with the Commission on November 7, 2014).
(10.4)	Form of 2015 Performance-Based Restricted Stock Unit Agreement under the W. R. Berkley Corporation 2012 Stock Incentive Plan (incorporated by reference to Exhibit 10.1 of the Company's Quarterly Report on Form 10-Q (File No. 1-15202) filed with the Commission on November 9, 2015).
(10.5)	Form of Restricted Stock Unit Agreement under the W. R. Berkley Corporation 2012 Stock Incentive Plan (incorporated by reference to Exhibit 10.1 of the Company's Quarterly Report on Form 10-Q (File No. 1-15202) filed with the Commission on November 8, 2012).
(10.6)	Form of Restricted Stock Unit Agreement under the W. R. Berkley Corporation 2003 Stock Incentive Plan (incorporated by reference to Exhibit 10.2 of the Company’s Quarterly Report on Form 10-Q (File No. 1-15202) filed with the Commission on May 3, 2005).
(10.7)	Form of Restricted Stock Unit Agreement under the W. R. Berkley Corporation 2003 Stock Incentive Plan (incorporated by reference to Exhibit 10.1 of the Company’s Quarterly Report on Form 10-Q (File No. 1-15202) filed with the Commission on August 6, 2010).
(10.8)	W. R. Berkley Corporation Deferred Compensation Plan for Officers as amended and restated November 2, 2016 (incorporated by reference to Exhibit 10.2 of the Company’s Quarterly Report on Form 10-Q (File No. 1-15202) filed with the Commission on November 7, 2018).
(10.9)	Form of Restricted Stock Unit Agreement for grant of April 4, 2003 (incorporated by reference to Exhibit 10.2 of the Company’s Quarterly Report on Form 10-Q (File No. 1-15202) filed with the Commission on August 6, 2003).

110

(10.10)	W. R. Berkley Corporation Deferred Compensation Plan for Officers as amended and restated November 2, 2016 (incorporated by reference to Exhibit 10.2 of the Company’s Quarterly Report on Form 10-Q (File No. 1-15202) filed with the Commission on November 7, 2018).
(10.11)	W. R. Berkley Corporation Deferred Compensation Plan for Directors as amended and restated effective December 3, 2007 (incorporated by reference to Exhibit 10.2 of the Company’s Current Report on Form 8-K (File No. 1-15202) filed with the Commission on December 19, 2007).
(10.12)	W. R. Berkley Corporation Amended and Restated Annual Incentive Compensation Plan (incorporated by reference to Annex A of the Company's 2016 Proxy Statement (File No. 1-15202) filed with the Commission on April 15, 2016).
(10.13)	W. R. Berkley Corporation 2014 Long-Term Incentive Plan (incorporated by reference to Annex A of the Company’s 2014 Proxy Statement (File No. 1-15202) filed with the Commission on April 7, 2014).
(10.14)	Form of 2014 Performance Unit Award Agreement under the W. R. Berkley Corporation 2014 Long-Term Incentive Plan (incorporated by reference to Exhibit 10.1 of the Company’s Quarterly Report on Form 10-Q (File No. 1-15202) filed with the Commission on May 12, 2014).
(10.15)	Form of 2018 Performance Unit Award Agreement under the W. R. Berkley Corporation 2014 Long-Term Incentive Plan (incorporated by reference to Exhibit 10.1 of the Company’s Quarterly Report on Form 10-Q (File No. 1-15202) filed with the Commission on May 7, 2018).
(10.16)	Form of 2015 Performance Unit Award Agreement under the W. R. Berkley Corporation 2014 Long-Term Incentive Plan (incorporated by reference to Exhibit 10.1 of the Company’s Quarterly Report on Form 10-Q (File No. 1-15202) filed with the Commission on May 4, 2015).
(10.17)	Form of 2016 Performance Unit Award Agreement under the W. R. Berkley Corporation 2014 Long-Term Incentive Plan (incorporated by reference to Exhibit 10.1 of the Company’s Quarterly Report on Form 10-Q (File No. 1-15202) filed with the Commission on May 10, 2016).
(10.18)	W. R. Berkley Corporation 2009 Directors Stock Plan (incorporated by reference to Annex B of the Company’s 2015 Proxy Statement (File No. 1-15202) filed with the Commission on April 20, 2015).
(10.19)	Form of 2018 Performance-Based Restricted Stock Unit Agreement Under the W. R. Berkley Corporation 2018 Stock Incentive Plan (incorporated by reference to Exhibit 10.1 of the Company’s Quarterly Report on Form 10-Q (File No. 1-15202) filed with the Commission on November 7, 2018).
(10.20)	Supplemental Benefits Agreement between William R. Berkley and the Company as amended and restated as of December 21, 2011 (incorporated by reference to Exhibit 10.14 of the Company's Annual Report on Form 10-K (File No. 1-15202) filed with the Commission on February 28, 2012).
(10.21)	Form of Dividend Equivalent Rights Award Agreement Under the W. R. Berkley Corporation 2012 Stock Incentive Plan (incorporated by reference to Exhibit 10.1 of the Company’s Quarterly Report on Form 10-Q (File No. 1-15202) filed with the Commission on August 7, 2015).
(10.22)	Form of 2017 Performance-Based Restricted Stock Unit Agreement Under the W. R. Berkley Corporation 2012 Stock Incentive Plan (incorporated by reference to Exhibit 10.1 of the Company’s Quarterly Report on Form 10-Q (File No. 1-15202) filed with the Commission on November 8, 2017).
(14)	Code of Ethics for Senior Financial Officers (incorporated by reference to Exhibit 14 of the Company’s Annual Report on Form 10-K (File No. 1-15202) filed with the Commission on March 14, 2005).
(21)	List of the Company’s subsidiaries.
(23)	Consent of Independent Registered Public Accounting Firm.
(31.1)	Certification of the Chief Executive Officer pursuant to Rule 13a-14(a)/ 15d-14(a).

111

(31.2)	Certification of the Chief Financial Officer pursuant to Rule 13a-14(a)/ 15d-14(a).
(32.1)	Certification of the Chief Executive Officer and Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.

ITEM 16. FORM 10-K Summary

None.

112

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

W. R. BERKLEY CORPORATION

By	/s/ W. Robert Berkley, Jr.
	W. Robert Berkley, Jr., President and Chief Executive Officer

February 22, 2019

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

Signature	Title	Date
/s/ William R. Berkley	Executive Chairman	February 22, 2019
William R. Berkley	of the Board of Directors
/s/ W. Robert Berkley, Jr.	President, Chief Executive Officer	February 22, 2019
W. Robert Berkley, Jr.	and Director
	(Principal executive officer)
/s/ Christopher L. Augostini	Director	February 22, 2019
Christopher L. Augostini
/s/ Ronald E. Blaylock	Director	February 22, 2019
Ronald E. Blaylock
/s/ Mark E. Brockbank	Director	February 22, 2019
Mark E. Brockbank
/s/ Mary C. Farrell	Director	February 22, 2019
Mary C. Farrell
/s/ María Luisa Ferré	Director	February 22, 2019
María Luisa Ferré
/s/ Jack H. Nusbaum	Director	February 22, 2019
Jack H. Nusbaum
/s/ Leigh A. Pusey	Director	February 22, 2019
Leigh Ann Pusey
/s/ Mark L. Shapiro	Director	February 22, 2019
Mark L. Shapiro
/s/ Richard M. Baio	Senior Vice President,	February 22, 2019
Richard M. Baio	Chief Financial Officer and Treasurer
	(Principal financial officer and principal accounting officer)

113

Schedule II

W. R. Berkley Corporation

Condensed Financial Information of Registrant

Balance Sheets (Parent Company)

	December 31,
(In thousands)	2018			2017
Assets:
Cash and cash equivalents	$	83,950		$	45,062
Fixed maturity securities available for sale at fair value (cost $1,317,058 and $1,059,834 at December 31, 2018 and 2017, respectively)	1,307,347			1,052,240
Loans receivable	51,544			53,019
Equity securities, at fair value (cost $3,430 in 2018 and 2017)	3,430			3,430
Investment in subsidiaries	6,786,999			7,140,108
Current federal income taxes	9,068			—
Deferred federal income taxes	66,995			—
Property, furniture and equipment at cost, less accumulated depreciation	13,391			14,421
Other assets	12,340			10,819
Total assets	$	8,335,064		$	8,319,099
Liabilities and stockholders’ equity
Liabilities:
Due to subsidiaries	$	116,125		$	232,756
Other liabilities	115,562			128,002
Current federal income taxes	—			10,486
Deferred federal income taxes	—			51,757
Subordinated debentures	907,491			728,218
Senior notes	1,758,035			1,756,536
Total liabilities	2,897,213			2,907,755
Stockholders’ equity:
Preferred stock	—			—
Common stock	47,024			47,024
Additional paid-in capital	1,063,144			1,048,283
Retained earnings (including accumulated undistributed net income of subsidiaries of $5,068,139 and $5,073,268 at December 31, 2018 and 2017, respectively)	7,558,619			6,956,882
Accumulated other comprehensive income	(510,470		)	68,541
Treasury stock, at cost	(2,720,466		)	(2,709,386		)
Total stockholders’ equity	5,437,851			5,411,344
Total liabilities and stockholders’ equity	$	8,335,064		$	8,319,099

________________

See Report of Independent Registered Public Accounting Firm and note to condensed financial statements.

114

Schedule II, Continued

W. R. Berkley Corporation

Condensed Financial Information of Registrant, Continued

Statements of Income (Parent Company)

	Year Ended December 31,
(In thousands)	2018			2017			2016
Management fees and investment income including dividends from subsidiaries of $639,477, $694,462 and $700,664 for the years ended December 31, 2018, 2017 and 2016, respectively	$	697,687		$	738,923		$	726,742
Net investment (losses) gains	(1,685		)	(4,286		)	909
Other income	530			805			376
Total revenues	696,532			735,442			728,027
Operating costs and expense	191,873			182,145			171,967
Interest expense	155,082			146,929			139,216
Income before federal income taxes	349,577			406,368			416,844
Federal income taxes:
Federal income taxes provided by subsidiaries on a separate return basis	409,439			115,597			327,520
Federal income tax expense on a consolidated return basis	(113,138		)	(195,261		)	(246,389		)
Net expense (benefit)	296,301			(79,664		)	81,131
Income before undistributed equity in net income of subsidiaries	645,878			326,704			497,975
Equity in undistributed net (loss) income of subsidiaries	(5,129		)	222,390			103,941
Net income	$	640,749		$	549,094		$	601,916

________________

See Report of Independent Registered Public Accounting Firm and note to condensed financial statements.

115

Schedule II, Continued

W. R. Berkley Corporation

Condensed Financial Information of Registrant, Continued

Statements of Cash Flows (Parent Company)

	Year Ended December 31,
(In thousands)	2018			2017			2016
Cash flows from operating activities:
Net income	$	640,749		$	549,094		$	601,916
Adjustments to reconcile net income to net cash from operating activities:
Net investment losses	1,685			4,286			3,649
Depreciation and amortization	9,441			2,039			2,744
Equity in undistributed earnings of subsidiaries	5,129			(222,390		)	(103,941		)
Tax payments received from subsidiaries	282,084			98,313			414,386
Federal income taxes provided by subsidiaries on a separate return basis	(409,439		)	(115,597		)	(327,520		)
Stock incentive plans	28,531			38,075			37,174
Change in:
Federal income taxes	(77,415		)	2,711			44,839
Other assets	1,348			(877		)	1,772
Other liabilities	109,016			18,661			(88,282		)
Accrued investment income	(2,870		)	(2,818		)	(2,743		)
Net cash from operating activities	588,259			371,497			583,994
Cash used in investing activities:
Proceeds from sales of fixed maturity securities	668,447			849,330			373,252
Proceeds from maturities and prepayments of fixed maturity securities	255,528			316,611			210,904
Cost of purchases of fixed maturity securities	(1,188,821		)	(1,329,379		)	(1,285,101		)
Change in loans receivable	1,475			(29,600		)	(23,419		)
Investments in and advances to subsidiaries, net	(184,597		)	(21,139		)	11,471
Net additions to real estate, furniture & equipment	(264		)	(1,055		)	(3,042		)
Net cash used in investing activities	(448,232		)	(215,232		)	(715,935		)
Cash (used in) from financing activities:
Net proceeds from issuance of senior notes	178,562			—			386,830
Repayment of senior notes	—			—			(9,353		)
Purchase of common treasury shares	(24,750		)	(47,807		)	(132,392		)
Cash dividends to common stockholders	(254,951		)	(188,199		)	(183,999		)
Net cash (used in) from financing activities	(101,139		)	(236,006		)	61,086
Net increase (decrease) in cash and cash equivalents	38,888			(79,741		)	(70,855		)
Cash and cash equivalents at beginning of year	45,062			124,803			195,658
Cash and cash equivalents at end of year	$	83,950		$	45,062		$	124,803

________________

See Report of Independent Registered Public Accounting Firm and note to condensed financial statements.

116

W. R. Berkley Corporation

Condensed Financial Information of Registrant, Continued

December 31, 2018

Note to Condensed Financial Statements (Parent Company)

The accompanying condensed financial statements should be read in conjunction with the notes to consolidated financial statements included elsewhere herein. Reclassifications have been made in the 2017 and 2016 financial statements as originally reported to conform them to the presentation of the 2018 financial statements.

The Company files a consolidated federal tax return with the results of its domestic insurance subsidiaries included on a statutory basis. Under present Company policy, federal income taxes payable by subsidiary companies on a separate-return basis are paid to W. R. Berkley Corporation, and the Company pays the tax due on a consolidated return basis.

117

Schedule III

W. R. Berkley Corporation and Subsidiaries

Supplementary Insurance Information

December 31, 2018, 2017 and 2016

(In thousands)	Deferred Policy Acquisition Cost		Reserve for Losses and Loss Expenses		Unearned Premiums		Net Premiums Earned		Net Investment Income		Loss and Loss Expenses		Amortization of Deferred Policy Acquisition Cost		Other Operating Costs and Expenses		Net Premiums Written
December 31, 2018
Insurance	$	439,945	$	10,226,324	$	3,131,018	$	5,864,981	$	518,733	$	3,626,924	$	811,178	$	1,162,328	$	5,952,861
Reinsurance	57,684		1,740,124		228,973		506,524		94,291		347,778		104,068		86,826		480,366
Corporate and adjustments	—		—		—		—		61,211		—		—		218,821		—
Total	$	497,629	$	11,966,448	$	3,359,991	$	6,371,505	$	674,235	$	3,974,702	$	915,246	$	1,467,975	$	6,433,227
December 31, 2017
Insurance	$	435,967	$	9,820,258	$	3,039,343	$	5,706,443	$	436,178	$	3,516,996	$	929,793	$	1,026,545	$	5,715,871
Reinsurance	71,582		1,850,150		250,837		604,976		91,146		485,352		181,696		44,349		544,637
Corporate and adjustments	—		—		—		—		48,464		—		—		254,549		—
Total	$	507,549	$	11,670,408	$	3,290,180	$	6,311,419	$	575,788	$	4,002,348	$	1,111,489	$	1,325,443	$	6,260,508
December 31, 2016
Insurance	$	442,317	$	9,445,210	$	2,975,060	$	5,618,842	$	431,489	$	3,430,139	$	964,064	$	954,858	$	5,743,620
Reinsurance	95,573		1,751,985		308,240		674,506		102,617		415,661		191,890		71,305		680,293
Corporate and adjustments	—		—		—		—		30,057		—		—		213,502		—
Total	$	537,890	$	11,197,195	$	3,283,300	$	6,293,348	$	564,163	$	3,845,800	$	1,155,954	$	1,239,665	$	6,423,913

__________________________

See Report of Independent Registered Public Accounting Firm.

118

Schedule IV

W. R. Berkley Corporation and Subsidiaries

Reinsurance

Years ended December 31, 2018, 2017 and 2016

	Premiums Written
(In thousands, other than percentages)	Direct Amount		Ceded to Other Companies		Assumed from Other Companies		Net Amount		Percentage of Amount Assumed to Net
Year ended December 31, 2018
Insurance	$	6,959,830	$	1,204,509	$	197,540	$	5,952,861	3.3	%
Reinsurance	13,386		64,758		531,738		480,366		110.7	%
Total	$	6,973,216	$	1,269,267	$	729,278	$	6,433,227	11.3	%
Year ended December 31, 2017
Insurance	$	6,707,916	$	1,153,960	$	161,915	$	5,715,871	2.8	%
Reinsurance	18,113		62,495		589,019		544,637		108.1	%
Total	$	6,726,029	$	1,216,455	$	750,934	$	6,260,508	12.0	%
Year ended December 31, 2016
Insurance	$	6,634,540	$	1,051,887	$	160,967	$	5,743,620	2.8	%
Reinsurance	13,060		67,901		735,134		680,293		108.1	%
Total	$	6,647,600	$	1,119,788	$	896,101	$	6,423,913	13.9	%

___________________________

See Report of Independent Registered Public Accounting Firm.

119

Schedule V

W. R. Berkley Corporation and Subsidiaries

Valuation and Qualifying Accounts

Years ended December 31, 2018, 2017 and 2016

(In thousands)	Opening Balance		Additions- Charged to Expense			Deduction- Amounts Written Off			Ending Balance
Year ended December 31, 2018
Premiums and fees receivable	$	39,926	$	6,985		$	(7,817	)	$	39,093
Due from reinsurers	1,010		65			(128		)	947
Deferred federal and foreign income taxes	16,619		18,772			(196		)	35,195
Loan loss reserves	3,383		—			—			3,383
Total	$	60,938	$	25,822		$	(8,141	)	$	78,618
Year ended December 31, 2017
Premiums and fees receivable	$	26,569	$	20,720		$	(7,363	)	$	39,926
Due from reinsurers	1,049		(29		)	(10		)	1,010
Deferred federal and foreign income taxes	5,457		12,663			(1,501		)	16,619
Loan loss reserves	3,397		(14		)	—			3,383
Total	$	36,472	$	33,340		$	(8,874	)	$	60,938
Year ended December 31, 2016
Premiums and fees receivable	$	22,524	$	10,006		$	(5,961	)	$	26,569
Due from reinsurers	1,020		20			9			1,049
Deferred federal and foreign income taxes	4,037		1,420			—			5,457
Loan loss reserves	2,094		1,303			—			3,397
Total	$	29,675	$	12,749		$	(5,952	)	$	36,472

_______________________

See Report of Independent Registered Public Accounting Firm.

120

Schedule VI

W. R. Berkley Corporation and Subsidiaries

Supplementary Information Concerning Property-Casualty Insurance Operations

Years Ended December 31, 2018, 2017 and 2016

(In thousands)	2018		2017			2016
Deferred policy acquisition costs	$	497,629	$	507,549		$	537,890
Reserves for losses and loss expenses	11,966,448		11,670,408			11,197,195
Unearned premiums	3,359,991		3,290,180			3,283,300
Net premiums earned	6,371,505		6,311,419			6,293,348
Net investment income	674,235		575,788			564,163
Losses and loss expenses incurred:
Current year	3,926,489		3,963,543			3,826,620
Prior years	6,831		(5,165		)	(29,904		)
Loss reserve discount accretion	41,382		43,970			49,084
Amortization of deferred policy acquisition costs	915,246		1,111,489			1,155,954
Paid losses and loss expenses	3,664,885		3,589,955			3,454,174
Net premiums written	6,433,227		6,260,508			6,423,913

___________________

See Report of Independent Registered Public Accounting Firm.

121

EX-21

Exhibit 21

Subsidiaries of the Registrant (as of December 31, 2018). Ownership is 100% unless otherwise indicated.

Entity Name	Domicile
120dB Films Capital, LLC (90% ownership)	Delaware
120dB Films Lending, LLC	Delaware
27 Leadenhall Street Properties Limited	Jersey
34 Leadenhall Street Limited	Jersey
52 Lime Street Management Limited	United Kingdom
860 Development Co LLC	Delaware
860 Washington Street LLC (75% ownership)	Delaware
Acadia Insurance Company	Iowa
Acadia Insurance Group, LLC	Delaware
Admiral Indemnity Company	Delaware
Admiral Insurance Company	Delaware
Admiral Insurance Group, LLC	Delaware
All American Agency Facilities, Inc.	Delaware
All Claims of Nevada, Inc.	Nevada
American Mining Insurance Company	Iowa
American Mining Insurance Group, LLC	Delaware
Armada Insurance Services, Inc.	California
ARS Investors II 2012-1 HVB, LLC (99% ownership)	Delaware
Banner Aerospace, Inc.	Delaware
Berkley Accident and Health, LLC	Delaware
Berkley Administrators of Connecticut, Inc.	Delaware
Berkley Alliance Managers, LLC	Delaware
Berkley Alternative Markets Insurance Services, LLC	Delaware
Berkley Argentina de Reaseguros S.A.	Argentina
Berkley Asset Protection Underwriters, LLC	Delaware
Berkley Assurance Company	Iowa
Berkley Aviation, LLC	Delaware
Berkley Canada Inc.	Canada
Berkley Capital Investors, LP	Delaware
Berkley Capital, LLC	Delaware
Berkley Custom Insurance Managers, LLC	Delaware
Berkley Dean & Company, Inc.	New Jersey
Berkley Facultative Reinsurance Services, LLC	Delaware
Berkley FinSecure, LLC	Delaware
Berkley Global Underwriters, LLC	Delaware
Berkley Healthcare Professional Insurance Services, LLC	Delaware
Berkley Insurance Company	Delaware
Berkley Insurance Company - Escritorio De Representacao do Brasil Ltda.	Brazil
Berkley Insurance Services, LLC	Delaware
Berkley International Aseguradora de Riesgos del Trabajo S. A.	Argentina
Berkley International Brasil Participacoes Ltda.	Brazil
Berkley International Compania de Servicios Mexico, S. A de C. V.	Mexico
Berkley International do Brasil Seguros S. A.	Brazil
Berkley International Holdings, LLC	Delaware
Berkley International Latinoamerica S. A.	Argentina
Berkley International Puerto Rico, LLC	Puerto Rico

Berkley International Seguros Colombia S.A.	Colombia
Berkley International Seguros, S. A. (99.59% ownership)	Argentina
Berkley International Seguros, S. A. (Uruguay)	Uruguay
Berkley International  Fianzas Mexico S.A. de C.V.	Mexico
Berkley International  Seguros Mexico S.A. de C.V.	Mexico
Berkley International, LLC	New York
Berkley Latin America and Caribbean Managers, LLC	Delaware
Berkley Life and Health Insurance Company	Iowa
Berkley Life Sciences, LLC	Delaware
Berkley London Holdings, Inc.	Delaware
Berkley LS Insurance Solutions, LLC	Delaware
Berkley Managers Insurance Services, LLC	Delaware
Berkley Mid-Atlantic Group, LLC	Delaware
Berkley National Insurance Company	Iowa
Berkley Net Underwriters, LLC	Delaware
Berkley North Pacific Group, LLC	Delaware
Berkley Offshore Underwriting Managers UK, Limited	United Kingdom
Berkley Offshore Underwriting Managers, LLC	Delaware
Berkley Oil & Gas Specialty Services, LLC	Delaware
Berkley Product Recall Insurance Agency, LLC	Delaware
Berkley Professional Liability UK, Limited	United Kingdom
Berkley Professional Liability, LLC	Delaware
Berkley Program Specialists, LLC	Delaware
Berkley Public Entity Managers, LLC	Delaware
Berkley Re America, LLC	Delaware
Berkley Re Direct, LLC	Delaware
Berkley Re UK Limited	United Kingdom
Berkley Regional Insurance Company	Iowa
Berkley Regional Insurance Services, LLC	Delaware
Berkley Regional Specialty, LLC	Delaware
Berkley Risk Administrators Company, LLC	Minnesota
Berkley Risk Administrators of Texas, Inc.	Texas
Berkley Risk Services of Vermont, Inc.	Delaware
Berkley Risk Solutions, LLC	Delaware
Berkley Select, LLC	Delaware
Berkley Southeast Insurance Group, LLC	Delaware
Berkley Specialty Insurance Company	Delaware
Berkley Specialty Insurance Services, LLC	Delaware
Berkley Specialty Underwriting Managers, LLC	Delaware
Berkley Surety Group, LLC	Delaware
Berkley Technology Services LLC	Delaware
Berkley Technology Underwriters, LLC	Delaware
Berkley Ventures, LLC	Delaware
BI China, Limited	Hong Kong
BIA Japan Services GK	Japan
BIL Advisors, LLC	Delaware
Breckenridge Insurance Group, Inc.	Colorado
Breckenridge Insurance Services, LLC	California
Breckenridge IS, Inc.	Delaware
BXM Insurance Services, Inc.	Delaware

Carolina Casualty Insurance Company	Iowa
Carolina Casualty Insurance Group, LLC	Delaware
CC Equity Holdings, LLC	Delaware
CC Investors, LLC	Delaware
Center Place Holdings LLC (92.59% ownership)	Delaware
CGH Claims Service, Inc.	Pennsylvania
CGH Insurance Group, LLC	Alabama
Clermont Insurance Company	Iowa
Clermont Specialty Managers, Ltd	New Jersey
Commodore Re Management Corporation	New Jersey
Continental Western Group, LLC	Delaware
Continental Western Insurance Company	Iowa
Corporate Imaging Concepts, LLC (82.06% ownership)	Delaware
Cotasy Corporation S. A.	Uruguay
CPT Equity LLC	Delaware
Crypton Investment Holdings LLC (89.5% Owned)	Delaware
Crypton LLC	Michigan
Crypton-NewCo Real Estate LLC	Delaware
East Isles Reinsurance, Ltd.	Bermuda
Facultative Resources, Inc.	Connecticut
Firemen's Insurance Company of Washington, D.C.	Delaware
Franchise Credit LLC	Delaware
Gemini Insurance Company	Delaware
Gemini Transportation Underwriters, LLC	Delaware
Great Divide Insurance Company	North Dakota
Greenwich AeroGroup Brazil Holdings, Inc.	Delaware
Greenwich AeroGroup Brazil Leasing, Inc.	Delaware
Greenwich AeroGroup International, Inc.	Delaware
Greenwich AeroGroup Serviços de Aviação do Brazil SA	Brazil
Greenwich AeroGroup, Inc.	Delaware
Greenwich Knight Insurance Company	Bermuda
GRG Investment Holdings, Ltd	Cayman Islands
Guangzhou Meridian Chemical Limited	China
Helivia Aero Taxi SA	Brazil
Helivia Participações do Brasil Ltda	Brazil
HVB-CT Sub, LLC	Delaware
Independent Plan Administrators, LLC	Nevada
Insurance Networks Alliance, LLC	Delaware
Interlaken Capital Aviation Holdings, Inc.	Delaware
Interlaken Capital Aviation Services, Inc.	Delaware
Intrepid Direct Insurance Agency, LLC	Kansas
Intrepid Insurance Company	Iowa
Jersey International Brokerage Corporation	New Jersey
Key Care, LLC	North Carolina
Key Risk Insurance Company	Iowa
Key Risk Management Services, LLC	Delaware
Key Risk Underwriting Managers, LLC	Delaware
Lavalier Insurance Services, LLC	Delaware
Lex NY Equities LLC	Delaware
Loan Opportunity Fund I, LLC	Delaware

MADA Reciprocal Services, Inc.	Minnesota
Magaverse, Limited	Hong Kong
Maine Compensation Services, Inc.	Maine
Masterclass, Limited	Hong Kong
Merrill Management Corporation	Delaware
Mgaero LLC	Delaware
Middle Patent Capital, LLC	Delaware
Midwest Employers Casualty Company	Delaware
Midwest Employers Casualty Group, LLC	Delaware
Midwest Employers Services, LLC	Delaware
Mining Insurance Markets, Inc.	Alabama
Monitor Liability Managers, LLC	Delaware
MPC Bloomington LLC	Delaware
MPC Memphis HI LLC	Delaware
Nano-Tex Asia Limited	Hong Kong
Nano-Tex LLC	Michigan
Nautilus Excess Insurance Agency, LLC	Delaware
Nautilus Insurance Company	Arizona
Nautilus Insurance Group, LLC	Delaware
Northwest International Underwriting Manager, Inc.	Washington
Overby-Seawell Company	Georgia
Platinum Program Managers & Insurance Services, Inc.	California
Preferred Employers Group, LLC	Delaware
Preferred Employers Insurance Company	California
Professional Aircraft Accessories, Inc.	Delaware
Professional Aviation Associates, Inc.	Georgia
Queen's Island Insurance Company, Ltd.	Bermuda
Rasmussen Agency, Inc.	New Jersey
Regional Excess Underwriters, LLC	Delaware
Reinserco, Inc.	New Jersey
Riverport Insurance Company	Iowa
Riverport Insurance Services, LLC	Delaware
RPW Equity LLC	Delaware
Select Marketing Insurance Services, LLC	California
Signet Star Holdings, Inc.	Delaware
SilverCap-Greenwich, LLC (98.8% ownership)	Delaware
Southeastern Underwriters, Inc.	Virginia
StarNet Insurance Company	Delaware
Starnet Insurance Services, LLC	Delaware
Steamboat Asset Management, LLC	Delaware
Steamboat Opportunity Partners, LLC	Delaware
Summit Aviation, Inc.	Delaware
Surety-Pro Services, Inc.	Delaware
Target Markets, LLC	Delaware
Target Programs, LLC	Delaware
Tri-State Insurance Company of Minnesota	Iowa
Union Insurance Company	Iowa
Union Standard Insurance Group, LLC	Delaware
Union Standard Management Company, Inc.	Texas
Vela Insurance Services, LLC	Delaware

Verus Underwriting Managers, LLC	Delaware
W. R. Berkley Europe AG	Liechtenstein
W. R. Berkley European Holdings AG	Switzerland
W. R. Berkley European Services GmbH	Switzerland
W. R. Berkley Insurance (Europe), SE	Liechtenstein
W. R. Berkley London Holdings, Limited	United Kingdom
W. R. Berkley London Staff, Limited	United Kingdom
W. R. Berkley Mexico, S. A. de C. V.	Mexico
W. R. Berkley Spain, S. L. U.	Spain
W. R. Berkley Syndicate Holdings Limited	United Kingdom
W. R. Berkley Syndicate Limited	United Kingdom
W. R. Berkley Syndicate Management Limited	United Kingdom
W. R. Berkley UK Limited	United Kingdom
Western Aircraft, Inc.	Nevada
Western Pinnacle Insurance Services, Inc.	California
WRBC Aviation Leasing, LLC	Delaware
WRBC Corporate Member Limited	United Kingdom
WRBC Development UK Limited	United Kingdom
WRBC Services, Limited	United Kingdom
WRBC Support Services, LLC	Delaware
WRBC Transportation, Inc.	Delaware
ZES Insurance Agency, LLC	Delaware

EX-23

Consent of Independent Registered Public Accounting Firm

The Board of Directors and Stockholders

W. R. Berkley Corporation:

We consent to the incorporation by reference in the registration statement on Form S-3 (No. 333-221559) and on Forms S-8 (No. 333-225579, No. 33-88640, No. 333-127598, No. 333-183191 and No. 333-205226) of W. R. Berkley Corporation of our reports dated February 22, 2019, with respect to the consolidated balance sheets of W. R. Berkley Corporation as of December 31, 2018 and 2017, the related consolidated statements of income, comprehensive income, stockholders’ equity, and cash flows for each of the years in the three-year period ended December 31, 2018, and the related notes (and financial statement schedules II to VI) (collectively, the “consolidated financial statements”), and the effectiveness of internal control over financial reporting as of December 31, 2018, which reports appear in the December 31, 2018 annual report on Form 10‑K of W. R. Berkley Corporation. Our report refers to a change in the method of accounting for equity investments measured at fair value with changes in the fair value recognized through net income (other than those accounted for under equity method of accounting or those that result in consolidation of the investee) effective January 1, 2018 due to the adoption of ASU 2016-01, Financial Instruments

/S/ KPMG LLP

New York, New York

February 22, 2019

EX-31.1

Exhibit 31.1

CERTIFICATIONS

I, W. Robert Berkley, Jr., President and Chief Executive Officer of W. R. Berkley Corporation (the “registrant”), certify that:

1. I have reviewed this annual report on Form 10-K of the registrant;

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.

Date: February 22, 2019

/s/ W. Robert Berkley, Jr. 

W. Robert Berkley, Jr.

President and Chief Executive Officer 

EX-31.2

Exhibit 31.2

CERTIFICATIONS

I, Richard M. Baio, Senior Vice President - Chief Financial Officer and Treasurer of W. R. Berkley Corporation (the “registrant”), certify that:

1. I have reviewed this annual report on Form 10-K of the registrant;

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.

Date: February 22, 2019

/s/ Richard M. Baio

Richard M. Baio

Senior Vice President,

Chief Financial Officer and Treasurer

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report of W. R. Berkley Corporation (the “Company”) on Form 10-K for the fiscal year ended December 31, 2018 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), we, W. Robert Berkley, Jr., President and Chief Executive Officer of the Company, and Richard M. Baio, Senior Vice President-Chief Financial Officer and Treasurer of the Company, certify, pursuant to 18 U.S.C. §1350, as adopted pursuant to §906 of the Sarbanes-Oxley Act of 2002, that:

(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/ W. Robert Berkley, Jr.

W. Robert Berkley, Jr.

President and Chief Executive Officer

/s/ Richard M. Baio

Richard M. Baio

Senior Vice President — Chief Financial Officer and Treasurer

February 22, 2019

A signed original of this written statement required by Section 906 has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.

XML

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2018	Feb. 19, 2019	Jun. 30, 2018
Document and Entity Information [Abstract]
Entity Registrant Name	BERKLEY W R CORP
Entity Central Index Key	0000011544
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		122,013,621
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 7,014,828,524

XML

Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
REVENUES:
Net premiums written	$ 6,433,227	$ 6,260,508	$ 6,423,913
Change in net unearned premiums	(61,722)	50,911	(130,565)
Net premiums earned	6,371,505	6,311,419	6,293,348
Net investment income	674,235	575,788	564,163
Net realized and unrealized gains on investments:
Net realized and unrealized gains before OTTI	160,175	335,858	285,119
Other-than-temporary impairments (OTTI)	(5,687)	0	(18,114)
Net realized and unrealized gains on investments	154,488	335,858	267,005
Revenues from non-insurance businesses	372,985	326,165	390,348
Insurance service fees	117,757	134,729	138,944
Other income	681	805	376
Total revenues	7,691,651	7,684,764	7,654,184
OPERATING COSTS AND EXPENSES:
Losses and loss expenses	3,974,702	4,002,348	3,845,800
Other operating costs and expenses	2,383,221	2,436,932	2,395,619
Expenses from non-insurance businesses	364,449	325,417	375,431
Interest expense	157,185	147,297	140,896
Total operating costs and expenses	6,879,557	6,911,994	6,757,746
Income before income taxes	812,094	772,770	896,438
Income tax expense	(163,028)	(219,433)	(292,953)
Net income before noncontrolling interests	649,066	553,337	603,485
Noncontrolling interests	(8,317)	(4,243)	(1,569)
Net income to common stockholders	$ 640,749	$ 549,094	$ 601,916
NET INCOME PER SHARE:
Basic (dollars per share)	$ 5.06	$ 4.40	$ 4.91
Diluted (dollars per share)	$ 5.00	$ 4.26	$ 4.68

XML

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Investments:
Fixed maturity securities	$ 13,606,812	$ 13,551,250
Investment funds	1,332,818	1,155,677
Real estate	1,957,092	1,469,601
Arbitrage trading account	452,548	617,649
Equity securities	279,006	576,647
Loans receivable	94,813	79,684
Total investments	17,723,089	17,450,508
Cash and cash equivalents	817,602	950,471
Premiums and fees receivable	1,807,762	1,773,844
Due from reinsurers	1,932,291	1,783,200
Deferred policy acquisition costs	497,629	507,549
Prepaid reinsurance premiums	498,880	472,009
Trading account receivable from brokers and clearing organizations	347,228	189,280
Property, furniture and equipment	416,372	422,960
Goodwill	173,037	178,945
Accrued investment income	144,481	136,597
Current federal and foreign income taxes	703	0
Deferred federal and foreign income taxes	35,490	0
Other assets	501,413	434,554
Total assets	24,895,977	24,299,917
Liabilities:
Reserves for losses and loss expenses	11,966,448	11,670,408
Unearned premiums	3,359,991	3,290,180
Due to reinsurers	256,917	246,460
Trading account securities sold but not yet purchased	38,120	64,358
Current federal and foreign income taxes	0	11,327
Deferred federal and foreign income taxes	0	86,764
Other liabilities	1,005,184	981,987
Senior notes and other debt	1,882,028	1,769,052
Subordinated debentures	907,491	728,218
Total liabilities	19,416,179	18,848,754
Equity:
Preferred stock, par value $.10 per share: Authorized 5,000,000 shares; issued and outstanding - none	0	0
Common stock, par value $.20 per share: Authorized 500,000,000 shares, issued and outstanding, net of treasury shares, 121,995,760 and 121,514,852 shares, respectively	47,024	47,024
Additional paid-in capital	1,063,144	1,048,283
Retained earnings	7,558,619	6,956,882
Accumulated other comprehensive (loss) income	(510,470)	68,541
Treasury stock, at cost, 113,122,158 and 113,603,066 shares, respectively	(2,720,466)	(2,709,386)
Total common stockholders’ equity	5,437,851	5,411,344
Noncontrolling interests	41,947	39,819
Total equity	5,479,798	5,451,163
Total liabilities and equity	$ 24,895,977	$ 24,299,917

XML

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Preferred stock, par value (dollars per share)	$ 0.10	$ 0.10
Preferred stock, authorized (shares)	5,000,000	5,000,000
Preferred stock, issued (shares)	0	0
Preferred stock, outstanding (shares)	0	0
Common stock, par value (dollars per share)	$ 0.20	$ 0.20
Common stock, authorized (shares)	500,000,000	500,000,000
Common stock, issued (shares)	121,995,760	121,514,852
Common stock, outstanding (shares)	121,995,760	121,514,852
Treasury stock, at cost (shares)	113,122,158	113,603,066

XML

Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common stocks	Additional Paid In Capital	Retained earnings	Accumulated Other Comprehensive (Loss) Income	Unrealized investment (losses) gains	Currency translation adjustments	Treasury Stock	Noncontrolling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect adjustment resulting from changes in accounting principles				$ 0		$ 0
Beginning of period at Dec. 31, 2015		$ 47,024	$ 1,005,455	6,178,070		180,695	$ (247,393)	$ (2,563,605)	$ 32,962
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted stock units issued			(3,594)
Restricted stock units expensed			35,585
Unrealized (losses) gains on securities not other-than-temporarily impaired	$ 246,518					246,872
Unrealized (losses) gains on other-than-temporarily impaired securities						(413)
Net change in period	(124,193)						(124,193)
Stock exercised/vested								6,495
Stock issued								685
Stock repurchased								(132,392)
(Distributions) contributions									(546)
Net income	603,485			601,916					1,569
Dividends				(183,999)
Other comprehensive (loss) income, net of tax	122,325								(59)
End of period at Dec. 31, 2016		47,024	1,037,446	6,595,987	$ 55,568	427,154	(371,586)	(2,688,817)	33,926
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect adjustment resulting from changes in accounting principles				0		0
Restricted stock units issued			(27,959)
Restricted stock units expensed			38,796
Unrealized (losses) gains on securities not other-than-temporarily impaired	(51,752)					(52,628)
Unrealized (losses) gains on other-than-temporarily impaired securities						895
Net change in period	64,706						64,706
Stock exercised/vested								26,511
Stock issued								727
Stock repurchased								(47,807)
(Distributions) contributions									1,631
Net income	553,337			549,094					4,243
Dividends				(188,199)
Other comprehensive (loss) income, net of tax	12,954				12,954		64,706		19
End of period at Dec. 31, 2017	5,451,163	$ 47,024	1,048,283	6,956,882	68,541	375,421	(306,880)	(2,709,386)	39,819
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect adjustment resulting from changes in accounting principles				215,939	(214,539)	(214,539)	0
Restricted stock units issued			(19,547)
Restricted stock units expensed			34,408
Unrealized (losses) gains on securities not other-than-temporarily impaired	(252,327)					(252,241)
Unrealized (losses) gains on other-than-temporarily impaired securities						(132)
Net change in period	(112,099)						(112,099)
Stock exercised/vested								12,981
Stock issued								689
Stock repurchased								(24,750)
(Distributions) contributions									(6,143)
Net income	649,066			640,749					8,317
Dividends				(254,951)
Other comprehensive (loss) income, net of tax	(364,426)				(364,426)		(112,099)		(46)
End of period at Dec. 31, 2018	$ 5,479,798		$ 1,063,144	$ 7,558,619	$ (510,470)	$ (91,491)	$ (418,979)	$ (2,720,466)	$ 41,947

XML

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income before noncontrolling interests	$ 649,066	$ 553,337	$ 603,485
Other comprehensive (loss) gain:
Change in unrealized translation adjustments	(112,099)	64,706	(124,193)
Change in unrealized investment (losses) gains, net of taxes	(252,327)	(51,752)	246,518
Other comprehensive (loss) gain	(364,426)	12,954	122,325
Comprehensive income	284,640	566,291	725,810
Comprehensive income to the noncontrolling interest	(8,271)	(4,262)	(1,510)
Comprehensive income to common stockholders	$ 276,369	$ 562,029	$ 724,300

XML

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
CASH FROM OPERATING ACTIVITIES:
Net income to common stockholders	$ 640,749	$ 549,094	$ 601,916
Adjustments to reconcile net income to net cash from operating activities:
Net realized and unrealized gains on investments	(154,488)	(335,858)	(267,005)
Depreciation and amortization	131,108	112,956	86,051
Noncontrolling interests	8,317	4,243	1,569
Investment funds	(109,349)	(69,333)	(99,301)
Stock incentive plans	36,591	40,490	37,174
Change in:
Arbitrage trading account	(19,093)	(4,896)	(10,633)
Premiums and fees receivable	(43,813)	(67,752)	(60,403)
Reinsurance accounts	(165,287)	(66,542)	(235,455)
Deferred policy acquisition costs	7,788	30,343	(25,912)
Current income taxes	(11,950)	25,859	42,632
Deferred income taxes	(74,761)	(16,893)	9,012
Reserves for losses and loss expenses	339,015	438,530	572,196
Unearned premiums	84,142	4,160	149,683
Other	(48,770)	66,482	46,852
Net cash from operating activities	620,199	710,883	848,376
CASH FLOWS USED IN INVESTING ACTIVITIES:
Proceeds from sale of fixed maturity securities	3,525,149	4,035,162	2,440,310
Proceeds from sale of equity securities	497,989	195,270	143,042
(Contributions) distributions from investment funds	(79,635)	247,404	142,601
Proceeds from maturities and prepayments of fixed maturity securities	2,676,455	3,556,744	2,189,365
Purchase of fixed maturity securities	(6,677,753)	(7,940,957)	(5,541,202)
Purchase of equity securities	(85,610)	(27,522)	(202,736)
Real estate purchased	(514,064)	(236,039)	(299,123)
Change in loans receivable	(13,204)	27,135	166,327
Net additions to property, furniture and equipment	(49,860)	(115,719)	(50,829)
Change in balances due from security brokers	4,262	(4,372)	20,992
Cash received in connection with business disposition	8,664	0	250,216
Payment for business purchased, net of cash acquired	(6,637)	(70,570)	(53,451)
Net cash used in investing activities	(714,244)	(333,464)	(794,488)
CASH FLOWS USED IN FINANCING ACTIVITIES:
Net proceeds from issuance of debt	294,562	6,983	388,769
Repayment of senior notes and other debt	(4,524)	(20)	(75,487)
Cash dividends to common stockholders	(254,951)	(188,199)	(183,999)
Purchase of common treasury shares	(24,750)	(47,807)	(132,392)
Other, net	(17,740)	(6,043)	(3,823)
Net cash used in financing activities	(7,403)	(235,086)	(6,932)
Net impact on cash due to change in foreign exchange rates	(31,421)	12,853	(15,302)
Net (decrease) increase in cash and cash equivalents	(132,869)	155,186	31,654
Cash and cash equivalents at beginning of year	950,471	795,285	763,631
Cash and cash equivalents at end of year	$ 817,602	$ 950,471	$ 795,285

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Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2018

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Summary of Significant Accounting Policies

(A) Principles of consolidation and basis of presentation

The consolidated financial statements, which include the accounts of W. R. Berkley Corporation and its subsidiaries (the "Company"), have been prepared on the basis of U.S. generally accepted accounting principles ("GAAP"). All significant intercompany transactions and balances have been eliminated. Reclassifications have been made in the 2017 and 2016 financial statements to conform to the presentation of the 2018 financial statements. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the revenues and expenses reflected during the reporting period. The most significant items on our balance sheet that involve a greater degree of accounting estimates that are subject to change in the future are the valuation of investments, other-than-temporary impairments, loss and loss expense reserves and premium estimates. Actual results could differ from those estimates.

(B) Revenue recognition

Insurance premiums are recognized as written at the inception of the policy. Reinsurance premiums are estimated based upon information received from ceding companies, and subsequent differences from such estimates are recorded in the period they are determined. Insurance and reinsurance premiums are primarily earned on a pro rata basis over the policy term. Fees for services are earned over the period that the services are provided.

Audit premiums are recognized when they are reliably determinable. The change in accruals for earned but unbilled audit premiums (decreased) increased net premiums written and premiums earned by $(4) million, $8 million and $8 million in 2018, 2017 and 2016, respectively.

Revenues from non-insurance businesses are derived from businesses engaged in the distribution of promotional merchandise, world-wide textile solutions, and aircraft services provided to the general, commercial and military aviation markets. These aircraft services include (i) the distribution, manufacturing, repair and overhaul of aircraft parts and components, (ii) the sale of new and used aircraft, and (iii) avionics, fuel, maintenance, storage and charter services. Revenue is recognized upon the shipment of products and parts, the delivery of aircraft, the delivery of fuel, and over the completion period of services.

Insurance service fee revenue represents servicing fees for program administration and claims management services provided by the Company, including workers' compensation assigned risk plans, as well as insurance brokerage and risk management services. Fees for program administration, claims management and risk management services are primarily recognized ratably over the related contract period for which the underlying services are rendered. Commissions for insurance brokerage are generally recognized when the underlying insurance policy is effective.

(C) Cash and cash equivalents

Cash equivalents consist of funds invested in money market accounts and investments with an effective maturity of three months or less when purchased.

(D) Investments

Fixed maturity securities classified as available for sale are carried at estimated fair value, with unrealized gains and losses, net of applicable income taxes, excluded from earnings and reported as a component of comprehensive income and a separate component of stockholders' equity. Fixed maturity securities that the Company has the positive intent and ability to hold to maturity are classified as held to maturity and reported at amortized cost. Investment income from fixed maturity securities is recognized based on the constant effective yield method. Premiums and discounts on mortgage-backed securities are adjusted for the effects of actual and anticipated prepayments on a retrospective basis.

Equity securities with readily determinable fair values are measured at fair value, with changes in the fair value recognized in net income within net realized and unrealized gains on investments. (See (Q) Recent accounting pronouncements.)

Fixed maturity securities that the Company purchased with the intent to sell in the near-term are classified as trading account securities and are reported at estimated fair value. Realized and unrealized gains and losses from trading activity are reported as net investment income and are recorded at the trade date. Short sales and short call options are presented as trading

securities sold but not yet purchased. Unsettled trades and the net margin balances held by the clearing broker are presented as a trading account receivable from brokers and clearing organizations.

Investment funds are carried under the equity method of accounting. The Company's share of the earnings or losses of investment funds is primarily reported on a one-quarter lag in order to facilitate the timely completion of the Company's consolidated financial statements.

Loans receivable primarily represent commercial real estate mortgage loans and bank loans and are carried at amortized cost. The Company monitors the performance of its loans receivable and establishes an allowance for loan losses for loans where the Company determines it is probable that the contractual terms will not be met, with a corresponding charge to earnings. For loans that are evaluated individually and deemed to be impaired, the Company establishes a specific allowance based on a discounted cash flow analysis and comparable cost and sales methodologies, if appropriate. Individual loans that are not considered impaired and smaller-balance homogeneous loans are evaluated collectively and a general allowance is established if it is considered probable that a loss has been incurred.

The accrual of interest on loans receivable is discontinued if the loan is 90 days past due based on the contractual terms of the loan unless the loan is adequately secured and in process of collection. In general, loans are placed on non-accrual status or charged off at an earlier date if collection of principal or interest is considered doubtful. Interest on these loans is accounted for on a cash basis until qualifying for return to accrual status. Loans are returned to accrual status when all principal and interest amounts contractually due are brought current and future payments are reasonably assured.

Fair value is defined as “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.” Fair value of investments is determined based on a fair value hierarchy that prioritizes the use of observable inputs over the use of unobservable inputs and requires the use of observable inputs when available. (See Note 12 of the Notes to Consolidated Financial Statements.)

Realized gains or losses represent the difference between the cost of securities sold and the proceeds realized upon sale and are recorded at the trade date. The Company uses primarily the first-in, first-out method to determine the cost of securities sold.

The cost of securities is adjusted where appropriate to include a provision for a decline in value which is considered to be other than temporary. An other-than-temporary decline is considered to occur in investments where there has been a sustained reduction in fair value and where the Company does not expect to recover the cost basis of the investment prior to the time of sale or maturity.

For fixed maturity securities that the Company intends to sell or, more likely than not, would be required to sell, a decline in value below amortized cost is considered to be an other-than-temporary impairment (“OTTI”). The amount of OTTI is equal to the difference between amortized cost and fair value at the balance sheet date. For fixed maturity securities that the Company does not intend to sell or believes that it is more likely than not it would not be required to sell, a decline in value below amortized cost is considered to be an OTTI if the Company does not expect to recover the entire amortized cost basis of a security (i.e., the present value of cash flows expected to be collected is less than the amortized cost basis of the security). The portion of the decline in value considered to be a credit loss (i.e., the difference between the present value of cash flows expected to be collected and the amortized cost basis of the security) is recognized in earnings. The portion of the decline in value not considered to be a credit loss (i.e., the difference in the present value of cash flows expected to be collected and the fair value of the security) is recognized in other comprehensive income.

Impairment assessments for structured securities, including mortgage-backed securities and asset-backed securities, collateralized debt obligations and corporate debt, are generally evaluated based on the performance of the underlying collateral under various economic and default scenarios that may involve subjective judgments and estimates by management. Modeling these securities involves various factors, such as projected default rates, the nature and realizable value of the collateral, if any, the ability of the issuer to make scheduled payments, historical performance and other relevant economic and performance factors. If an OTTI determination is made, a discounted cash flow analysis is used to ascertain the amount of the credit impairment.

Real estate held for investment purposes is initially recorded at the purchase price, which is generally fair value, and is subsequently reported at cost less accumulated depreciation. Real estate taxes, interest and other costs incurred during development and construction are capitalized. Buildings are depreciated on a straight-line basis over the estimated useful lives of the building. Minimum rental income is recognized on a straight-line basis over the lease term. Income and expenses from real estate are reported as net investment income. The carrying value of real estate is reviewed for impairment and an impairment loss is recognized if the estimated undiscounted cash flows from the use and disposition of the property are less than the carrying value of the property.

(E) Per share data

The Company presents both basic and diluted net income per share (“EPS”) amounts. Basic EPS is calculated by dividing net income by weighted average number of common shares outstanding during the year (including 4,926,521 common shares held in a grantor trust). The common shares held in the grantor trust are for delivery upon settlement of vested but mandatorily deferred restricted stock units ("RSUs"). Shares held by the grantor trust do not affect diluted shares outstanding since the shares deliverable under vested RSUs were already included in diluted shares outstanding. Diluted EPS is based upon the weighted average number of basic and common equivalent shares outstanding during the year and is calculated using the treasury stock method for stock incentive plans. Common equivalent shares are excluded from the computation in periods in which they have an anti-dilutive effect.

(F) Deferred policy acquisition costs

Acquisition costs associated with the successful acquisition of new and renewed insurance and reinsurance contracts are deferred and amortized ratably over the terms of the related contracts. Ceding commissions received on reinsurance contracts are netted against acquisition costs and are recognized ratably over the life of the contract. Deferred policy acquisition costs are presented net of unearned ceding commissions. Deferred policy acquisition costs are comprised primarily of commissions, as well as employment-related underwriting costs and premium taxes. Deferred policy acquisition costs are reviewed to determine if they are recoverable from future income and, if not, are charged to expense. The recoverability of deferred policy acquisition costs is evaluated separately by each of our operating companies. Future investment income is taken into account in measuring the recoverability of deferred policy acquisition costs.

(G) Reserves for losses and loss expenses

Reserves for losses and loss expenses are an accumulation of amounts determined on the basis of (1) evaluation of claims for business written directly by the Company; (2) estimates received from other companies for reinsurance assumed by the Company; and (3) estimates for losses incurred but not reported (based on Company and industry experience). These estimates are periodically reviewed and, as experience develops and new information becomes known, the reserves are adjusted as necessary. Such adjustments are reflected in the statements of income in the period in which they are determined. The Company discounts its reserves for excess and assumed workers' compensation claims using a risk-free or statutory rate. (See Note 13 of Notes to Consolidated Financial Statements.)

(H) Reinsurance ceded

The unearned portion of premiums ceded to reinsurers is reported as prepaid reinsurance premiums and earned ratably over the policy term. The estimated amounts of reinsurance recoverable on unpaid losses are reported as due from reinsurers. To the extent any reinsurer does not meet its obligations under reinsurance agreements, the Company must discharge its liability. Amounts due from reinsurers are reflected net of funds held where the right of offset is present. The Company has provided reserves for estimated uncollectible reinsurance.

(I) Deposit accounting

Contracts that do not meet the risk transfer requirements of GAAP are accounted for using the deposit accounting method. Under this method, an asset or liability is recognized at the inception of the contract based on consideration paid or received. The amount of the deposit asset or liability is adjusted at subsequent reporting dates using the interest method with a corresponding credit or charge to interest income or expense. Deposit liabilities for assumed reinsurance contracts were $45 million and $47 million at December 31, 2018 and 2017, respectively.

(J) Federal and foreign income taxes

The Company files a consolidated income tax return in the U.S. and foreign tax returns in countries where it has overseas operations. The Company's method of accounting for income taxes is the asset and liability method. Under this method, deferred tax assets and liabilities are measured using tax rates currently in effect or expected to apply in the years in which those temporary differences are expected to reverse. Interest and penalties, if any, are reported as income tax expense. The Company believes there are no tax positions that would require disclosure under GAAP. Deferred tax assets are reduced by a valuation allowance if it is more likely than not that all or a portion of the deferred tax assets will not be realized.

(K) Foreign currency

Gains and losses resulting from foreign currency transactions (transactions denominated in a currency other than the entity's functional currency) are reported on the statements of income as other operating costs and expenses. Unrealized gains or losses resulting from translating the results of non-U.S. dollar denominated operations are reported in accumulated other comprehensive income. Revenues and expenses denominated in currencies other than U.S. dollars are generally translated at the weighted average exchange rate during the year. Assets and liabilities are translated at the rate of exchange in effect at the balance sheet date.

(L) Property, furniture and equipment

Property, furniture and equipment are carried at cost less accumulated depreciation. Depreciation is calculated using the estimated useful lives of the respective assets. Depreciation expense was $54 million, $50 million and $47 million for 2018, 2017 and 2016, respectively.

(M) Comprehensive income

Comprehensive income encompasses all changes in stockholders' equity (except those arising from transactions with stockholders) and includes net income, net unrealized holding gains or losses on available for sale securities and unrealized foreign currency translation adjustments.

(N) Goodwill and other intangible assets

Goodwill and other intangible assets are tested for impairment on an annual basis and at interim periods where circumstances require. The Company's impairment test as of December 31, 2018 indicated that there were no material impairment losses related to goodwill and other intangible assets. Intangible assets of $104 million and $107 million are included in other assets as of December 31, 2018 and 2017, respectively.

(O) Restricted stock units

The costs resulting from all share-based payment transactions with employees are recognized in the consolidated financial statements using a fair-value-based measurement method. Compensation cost is recognized for financial reporting purposes over the period in which the employee is required to provide service in exchange for the award (generally the vesting period).

(P) Statements of cash flows

Interest payments were $155 million, $145 million and $137 million in 2018, 2017 and 2016, respectively. Income taxes paid were $186 million, $207 million and $232 million in 2018, 2017 and 2016, respectively. Other non-cash items include unrealized investment gains and losses. (See Note 10 of Notes to Consolidated Financial Statements.)

(Q) Recent accounting pronouncements

Recently adopted accounting pronouncements:

In May 2014, the Financial Accounting Standards Board ("FASB") issued ASU 2014-09, Revenue from Customers. ASU 2014-09 clarifies the principles for recognizing revenue. While insurance contracts are not within the scope of this updated guidance, the Company’s insurance service fee revenue and non-insurance business revenue are subject to this updated guidance. The updated guidance requires an entity to recognize revenue as performance obligations are met, in order to reflect the transfer of promised goods or services to customers in an amount that reflects the consideration the entity is entitled to receive for those goods or services. The updated guidance, as amended by ASU 2015-14, was effective for public business entities for annual and interim reporting periods beginning after December 15, 2017. The Company adopted this guidance on January 1, 2018 on a prospective basis. The impact of applying this guidance prospectively was a cumulative effect adjustment that increased retained earnings, a component of stockholders' equity, by $1 million after-tax.

In January 2016, the FASB issued ASU 2016-01, Financial Instruments.  ASU 2016-01 amends the accounting guidance for financial instruments to require all equity investments with readily determinable fair values to be measured at fair value with changes in the fair value recognized in net income (other than those accounted for under equity method of accounting or those that result in consolidation of the investee).  The updated guidance was effective for public business entities for annual reporting periods beginning after December 15, 2017 and interim periods within those years. The Company adopted this updated guidance on January 1, 2018 on a prospective basis. The impact of applying this guidance prospectively was a cumulative effect adjustment that increased retained earnings and decreased accumulated other comprehensive income ("AOCI") by offsetting amounts of $291 million, resulting in no net impact to total stockholders' equity. Following the adoption, the Company reports changes in fair value related to equity securities within net realized and unrealized gains on investments.

In February 2018, the FASB issued ASU 2018-02, Reporting Comprehensive Income, which amends previous guidance to allow a reclassification to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act of 2017 (the “Tax Act”). The amount of the reclassification includes the effect of the change in the U.S. federal corporate income tax rate on the gross deferred tax amounts and related valuation allowances, if any, at the date of the enactment of the Tax Act related to items in AOCI. The updated guidance was effective for reporting periods beginning after December 15, 2018, and was eligible for early adoption. The Company adopted this updated guidance on January 1, 2018. The impact of applying this guidance was a cumulative effect adjustment that decreased retained earnings and increased AOCI by offsetting amounts of $76 million, resulting in no net impact to total stockholders' equity.

All other accounting and reporting standards that became effective in 2018 were either not applicable to the Company or their adoption did not have a material impact on the Company. 

Accounting and reporting standards that are not yet effective:

In February 2016, the FASB issued ASU 2016-02, Leases, which amends the accounting and disclosure guidance for leases.  This guidance retains the two classifications of a lease, as either an operating or finance lease, both of which will require lessees to recognize a right-of-use asset and a lease liability for leases with terms of more than 12 months. The right-of-use asset and the lease liability will be determined based upon the present value of cash flows. Finance leases will reflect the financial arrangement by recognizing interest expense on the lease liability separately from the amortization expense of the right-of-use asset. Operating leases will recognize lease expense (with no separate recognition of interest expense) on a straight-line basis over the term of the lease. The accounting by lessors is not significantly changed by the updated guidance.  The updated guidance is effective for reporting periods beginning after December 15, 2018, and can be adopted prospectively or requires that the earliest comparative period presented include the measurement and recognition of existing leases with an adjustment to equity as if the updated guidance had always been applied. The Company will adopt the new guidance prospectively as of January 1, 2019. The Company does not expect the adoption of this guidance will have a material impact on its results of operations, financial position and liquidity. The adoption of this guidance will result in the recognition of an offsetting right-of-use asset and lease liability which will be less than 1% of total assets and approximately 1% of total liabilities.

In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses, which amends the accounting guidance for credit losses on financial instruments. The updated guidance amends the current other-than-temporary impairment model for available-for-sale debt securities by requiring the recognition of impairments relating to credit losses through an allowance account and limits the amount of credit loss to the difference between a security’s amortized cost basis and its fair value. This guidance also applies a new current expected credit loss model for determining credit-related impairments for financial instruments measured at amortized cost. The updated guidance is effective for reporting periods beginning after December 15, 2019. The Company will not be able to determine the impact the adoption of this guidance will have on its results of operations, financial position or liquidity until the year the guidance becomes effective.

All other recently issued but not yet effective accounting and reporting standards are either not applicable to the Company or are not expected to have a material impact on the Company.

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Consolidated Statement of Comprehensive (Loss) Income

12 Months Ended

Dec. 31, 2018

Equity [Abstract]

Consolidated Statement of Comprehensive (Loss) Income

Consolidated Statement of Comprehensive (Loss) Income

The following tables present the components of the changes in accumulated other comprehensive (loss) income ("AOCI") as of and for the years ended December 31, 2018 and 2017:

(In thousands)
December 31, 2018	Unrealized investment (losses) gains				Currency translation adjustments			Accumulated other comprehensive (loss) income
Changes in AOCI
Beginning of period	$	375,421			$	(306,880	)	$	68,541
Cumulative effect adjustment resulting from changes in accounting principles	(214,539		)		—			(214,539		)
Restated beginning of period	160,882				(306,880		)	(145,998		)
Other comprehensive loss before reclassifications	(246,535		)		(112,099		)	(358,634		)
Amounts reclassified from AOCI	(5,792		)		—			(5,792		)
Other comprehensive loss	(252,327		)		(112,099		)	(364,426		)
Unrealized investment loss related to non-controlling interest	(46		)		—			(46		)
Ending balance	$	(91,491	)		$	(418,979	)	$	(510,470	)
Amounts reclassified from AOCI
Pre-tax	$	(7,332	)	(1)	$	—		$	(7,332	)
Tax effect	1,540			(2)	—			1,540
After-tax amounts reclassified	$	(5,792	)		$	—		$	(5,792	)
Other comprehensive loss
Pre-tax	$	(302,737	)		$	(112,099	)	$	(414,836	)
Tax effect	50,410				—			50,410
Other comprehensive loss	$	(252,327	)		$	(112,099	)	$	(364,426	)

(In thousands)
December 31, 2017	Unrealized investment gains (losses)				Currency translation adjustments			Accumulated other comprehensive income (loss)
Changes in AOCI
Beginning of period	$	427,154			$	(371,586	)	$	55,568
Other comprehensive income before reclassifications	63,567				64,706			128,273
Amounts reclassified from AOCI	(115,319		)		—			(115,319		)
Other comprehensive (loss) income	(51,752		)		64,706			12,954
Unrealized investment gain related to non-controlling interest	19				—			19
Ending balance	$	375,421			$	(306,880	)	$	68,541
Amounts reclassified from AOCI
Pre-tax	$	(177,414	)	(1)	$	—		$	(177,414	)
Tax effect	62,095			(2)	—			62,095
After-tax amounts reclassified	$	(115,319	)		$	—		$	(115,319	)
Other comprehensive income (loss)
Pre-tax	$	(69,425	)		$	64,706		$	(4,719	)
Tax effect	17,673				—			17,673
Other comprehensive income (loss)	$	(51,752	)		$	64,706		$	12,954

_______________

(1) Net realized and unrealized gains on investments in the consolidated statements of income.

(2) Income tax expense in the consolidated statements of income.

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Investments In Fixed Maturity Securities

12 Months Ended

Dec. 31, 2018

Debt Securities

Schedule of Marketable Securities [Line Items]

Investments In Fixed Maturity Securities

Investments in Fixed Maturity Securities

At December 31, 2018 and 2017, investments in fixed maturity securities were as follows:

(In thousands)	Amortized Cost		Gross Unrealized					Fair Value		Carrying Value
			Gains		Losses
December 31, 2018
Held to maturity:
State and municipal	$	67,891	$	11,549	$	—		$	79,440	$	67,891
Residential mortgage-backed	10,744		1,259		—			12,003		10,744
Total held to maturity	78,635		12,808		—			91,443		78,635
Available for sale:
U.S. government and government agency	697,931		9,219		(4,910		)	702,240		702,240
State and municipal:
Special revenue	2,396,089		30,507		(19,790		)	2,406,806		2,406,806
State general obligation	335,626		11,951		(1,103		)	346,474		346,474
Pre-refunded	408,141		16,568		(30		)	424,679		424,679
Corporate backed	272,440		4,319		(2,350		)	274,409		274,409
Local general obligation	403,219		18,350		(1,339		)	420,230		420,230
Total state and municipal	3,815,515		81,695		(24,612		)	3,872,598		3,872,598
Mortgage-backed securities:
Residential (1)	1,264,376		7,729		(20,225		)	1,251,880		1,251,880
Commercial	345,070		1,304		(3,708		)	342,666		342,666
Total mortgage-backed securities	1,609,446		9,033		(23,933		)	1,594,546		1,594,546
Asset-backed securities	2,462,303		10,131		(33,687		)	2,438,747		2,438,747
Corporate:
Industrial	2,295,778		15,355		(53,312		)	2,257,821		2,257,821
Financial	1,502,427		7,178		(45,683		)	1,463,922		1,463,922
Utilities	330,326		2,997		(4,148		)	329,175		329,175
Other	60,238		322		(167		)	60,393		60,393
Total corporate	4,188,769		25,852		(103,310		)	4,111,311		4,111,311
Foreign government	822,093		11,753		(25,111		)	808,735		808,735
Total available for sale	13,596,057		147,683		(215,563		)	13,528,177		13,528,177
Total investments in fixed maturity securities	$	13,674,692	$	160,491	$	(215,563	)	$	13,619,620	$	13,606,812

(In thousands)	Amortized Cost		Gross Unrealized					Fair Value		Carrying Value
			Gains		Losses
December 31, 2017
Held to maturity:
State and municipal	$	65,882	$	14,499	$	—		$	80,381	$	65,882
Residential mortgage-backed	13,450		1,227		—			14,677		13,450
Total held to maturity	79,332		15,726		—			95,058		79,332
Available for sale:
U.S. government and government agency	372,748		8,824		(3,832		)	377,740		377,740
State and municipal:
Special revenue	2,663,245		53,512		(10,027		)	2,706,730		2,706,730
State general obligation	439,358		16,087		(711		)	454,734		454,734
Pre-refunded	436,241		22,701		(9		)	458,933		458,933
Corporate backed	375,268		10,059		(860		)	384,467		384,467
Local general obligation	417,955		23,242		(967		)	440,230		440,230
Total state and municipal	4,332,067		125,601		(12,574		)	4,445,094		4,445,094
Mortgage-backed securities:
Residential (1)	1,043,629		9,304		(13,547		)	1,039,386		1,039,386
Commercial	261,652		1,521		(2,628		)	260,545		260,545
Total mortgage-backed securities	1,305,281		10,825		(16,175		)	1,299,931		1,299,931
Asset-backed securities	2,111,132		11,024		(10,612		)	2,111,544		2,111,544
Corporate:
Industrial	2,574,400		52,210		(7,718		)	2,618,892		2,618,892
Financial	1,402,161		37,744		(5,138		)	1,434,767		1,434,767
Utilities	284,886		11,316		(1,248		)	294,954		294,954
Other	40,560		5		(66		)	40,499		40,499
Total corporate	4,302,007		101,275		(14,170		)	4,389,112		4,389,112
Foreign government	819,345		32,018		(2,866		)	848,497		848,497
Total available for sale	13,242,580		289,567		(60,229		)	13,471,918		13,471,918
Total investments in fixed maturity securities	$	13,321,912	$	305,293	$	(60,229	)	$	13,566,976	$	13,551,250

____________________

(1) Gross unrealized (losses) gains for mortgage-backed securities include ($55,090) and $76,467 as of December 31, 2018 and 2017, respectively, related to the non-credit portion of OTTI recognized in other comprehensive income.

The amortized cost and fair value of fixed maturity securities at December 31, 2018, by contractual maturity, are shown below. Actual maturities may differ from contractual maturities because certain issuers may have the right to call or prepay obligations.

(In thousands)	Amortized Cost		Fair Value
Due in one year or less	$	935,354	$	935,894
Due after one year through five years	4,666,934		4,669,502
Due after five years through ten years	3,037,450		3,045,868
Due after ten years	3,414,764		3,361,807
Mortgage-backed securities	1,620,190		1,606,549
Total	$	13,674,692	$	13,619,620

At December 31, 2018 and 2017, there were no investments, other than investments in United States government and government agency securities, which exceeded 10% of common stockholders’ equity. At December 31, 2018, investments with a carrying value of $1,700 million were on deposit in custodial or trust accounts, of which $1,332 million was on deposit with insurance regulators, $328 million was on deposit in support of the Company’s underwriting activities at Lloyd’s, $37 million was on deposit as security for reinsurance clients and $3 million was on deposit as security for letters of credit issued in support of the Company’s reinsurance operations.

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Investments In Equity Securities

12 Months Ended

Dec. 31, 2018

Equity securities

Schedule of Available-for-sale Securities [Line Items]

Investments in Equity Securities

Investments in Equity Securities

At December 31, 2018 and 2017, investments in equity securities were as follows:

(In thousands)	Cost		Gross Unrealized (1)					Fair Value		Carrying Value
			Gains		Losses
December 31, 2018
Common stocks	$	113,576	$	4,335	$	(19,719	)	$	98,192	$	98,192
Preferred stocks	115,201		72,364		(6,751		)	180,814		180,814
Total	$	228,777	$	76,699	$	(26,470	)	$	279,006	$	279,006
December 31, 2017
Common stocks	$	81,855	$	272,309	$	(1,960	)	$	352,204	$	352,204
Preferred stocks	124,150		102,890		(2,597		)	224,443		224,443
Total	$	206,005	$	375,199	$	(4,557	)	$	576,647	$	576,647

(1) Effective January 1, 2018, the Company adopted new accounting guidance that requires all equity investments with readily determinable fair values (subject to certain exceptions) to be measured at fair value, with changes in the fair value recognized through net income within net realized and unrealized gains on investments. Refer to Note 1 for additional information.

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Arbitrage Trading Account

12 Months Ended

Dec. 31, 2018

Trading Securities and Derivative Instruments [Abstract]

Arbitrage Trading Account

Arbitrage Trading Account

At December 31, 2018 and 2017, the fair value and carrying value of the arbitrage trading account were $453 million and $618 million, respectively. The primary focus of the trading account is merger arbitrage. Merger arbitrage is the business of investing in the securities of publicly held companies which are the targets in announced tender offers and mergers. Arbitrage investing differs from other types of investing in its focus on transactions and events believed likely to bring about a change in value over a relatively short time period (usually four months or less).

The Company uses put options, call options and swap contracts in order to mitigate the impact of potential changes in market conditions on the merger arbitrage trading account. These options and contracts are reported at fair value. As of December 31, 2018, the fair value of long option contracts outstanding was $37 thousand (notional amount of $18.4 million) and the fair value of short option contracts outstanding was $58 thousand (notional amount of $11.6 million). Other than with respect to the use of these trading account securities, the Company does not make use of derivatives.

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Net Investment Income

12 Months Ended

Dec. 31, 2018

Net Investment Income [Abstract]

Net Investment Income

Net Investment Income

Net investment income consists of the following:

(In thousands)	2018			2017			2016
Investment income earned on:
Fixed maturity securities, including cash and cash equivalents and loans receivable	$	519,269		$	473,101		$	444,247
Investment funds	109,349			68,169			99,301
Arbitrage trading account	28,157			19,145			18,693
Real estate	18,591			19,975			7,054
Equity securities	3,230			2,350			4,028
Gross investment income	678,596			582,740			573,323
Investment expense	(4,361		)	(6,952		)	(9,160		)
Net investment income	$	674,235		$	575,788		$	564,163

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Investment Funds

12 Months Ended

Dec. 31, 2018

Equity Method Investments and Joint Ventures [Abstract]

Investment Funds

Investment Funds

The Company evaluates whether it is an investor in a variable interest entity ("VIE").  Such entities do not have sufficient equity at risk to finance their activities without additional subordinated financial support, or the equity investors, as a group, do not have the characteristics of a controlling financial interest (primary beneficiary).  The Company determines whether it is the primary beneficiary of an entity subject to consolidation based on a qualitative assessment of the VIE's capital structure, contractual terms, nature of the VIE's operations and purpose, and the Company's relative exposure to the related risks of the VIE on the date it becomes initially involved in the VIE and on an ongoing basis.  The Company is not the primary beneficiary in any of its investment funds, and accordingly, carries its interests in investments funds under the equity method of accounting.

The Company’s maximum exposure to loss with respect to these investments is limited to the carrying amount reported on the Company’s consolidated balance sheet and its unfunded commitments of $270.2 million as of December 31, 2018.

Investment funds consist of the following:

	Carrying Value as of December 31,				Income (Losses)
(In thousands)	2018		2017		2018		2017			2016
Real estate	$	642,137	$	606,995	$	61,453	$	45,068		$	50,415
Energy	75,213		82,882		645		(15,764		)	19,747
Other funds	615,468		465,800		47,251		38,865			29,139
Total	$	1,332,818	$	1,155,677	$	109,349	$	68,169		$	99,301

The Company's share of the earnings or losses of investment funds is primarily reported on a one-quarter lag in order to facilitate the timely completion of the Company's consolidated financial statements.

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Real Estate

12 Months Ended

Dec. 31, 2018

Real Estate [Abstract]

Real Estate

Real Estate

Investment in real estate represents directly owned property held for investment, as follows:    

	As of December 31,
(In thousands)	2018		2017
Properties in operation	$	1,279,584	$	451,691
Properties under development	677,508		1,017,910
Total	$	1,957,092	$	1,469,601

In 2018, properties in operation included a long-term ground lease in Washington, D.C., a hotel in Memphis, Tennessee, two office complexes in New York City, office buildings in West Palm Beach and Palm Beach, Florida, and an office building in London, U.K. The office building in London, previously under development, transferred to properties in operation in 2018. Properties in operation are net of accumulated depreciation and amortization of $44,340,000 and $25,646,000 as of December 31, 2018 and 2017, respectively. Related depreciation expense was $20,644,000 and $9,212,000 for the years ended December 31, 2018 and 2017, respectively. Future minimum rental income expected on operating leases relating to properties in operation is $61,458,048 in 2019, $62,141,471 in 2020, $61,325,176 in 2021, $61,077,419 in 2022, $54,362,011 in 2023 and $584,592,072 thereafter.

The Company borrowed $101,750,000 through a non-recourse loan secured by the West Palm Beach office building in 2018. The loan matures in November 2028 and carries a fixed interest rate of 4.21%. The carrying value does not reflect the outstanding financing, but rather is reflected in subsidiary debt referenced in Note 15, Indebtedness.

A mixed-use project in Washington, D.C. has been under development in 2017 and 2018.

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Loans Receivable

12 Months Ended

Dec. 31, 2018

Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]

Loans Receivable

Loans Receivable

Loans receivable are as follows:

	As of December 31,
(In thousands)	2018		2017
Amortized cost (net of valuation allowance):
Real estate loans	$	62,289	$	66,057
Commercial loans	32,524		13,627
Total	$	94,813	$	79,684
Fair value:
Real estate loans	$	63,047	$	66,917
Commercial loans	34,026		15,130
Total	$	97,073	$	82,047
Valuation allowance:
Specific	$	1,200	$	1,200
General	2,183		2,183
Total	$	3,383	$	3,383
	For the Year Ended December 31,
	2018		2017
Increase (decrease) in valuation allowance	$	—	$	(14	)

Loans receivable in non-accrual status were $1.2 million and $4.3 million as of December 31, 2018 and 2017, respectively.

The Company monitors the performance of its loans receivable and assesses the ability of the borrower to pay principal and interest based upon loan structure, underlying property values, cash flow and related financial and operating performance of the property and market conditions. Loans receivable with a potential for default are further assessed using discounted cash flow analysis and comparable cost and sales methodologies, if appropriate.

The real estate loans are secured by commercial real estate primarily located in New York. These loans generally earn interest at floating LIBOR-based interest rates and have maturities (inclusive of extension options) through August 2025. The commercial loans are with small business owners who have secured the related financing with the assets of the business. Commercial loans generally earn interest on a fixed basis and have varying maturities not exceeding 10 years.

In evaluating the real estate loans, the Company considers their credit quality indicators, including loan to value ratios, which compare the outstanding loan amount to the estimated value of the property, the borrower’s financial condition and performance with respect to loan terms, the position in the capital structure, the overall leverage in the capital structure and other market conditions. Based on these considerations, none of the real estate loans were considered to be impaired at December 31, 2018, and accordingly, the Company determined that a specific valuation allowance was not required.

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Realized And Unrealized Investment Gains and Losses

12 Months Ended

Dec. 31, 2018

Realized and Unrealized Investment Gains (Losses) [Abstract]

Realized and Unrealized Investment Gains and Losses

Net Realized and Unrealized Gains (Losses) on Investments

Net realized and unrealized gains (losses) on investments are as follows:

(In thousands)	2018			2017			2016
Net realized and unrealized gains (losses) on investments in earnings
Fixed maturity securities:
Gains	$	26,752		$	28,217		$	72,215
Losses	(13,733		)	(5,342		)	(6,434		)
Equity securities (1):
Net realized gains on investment sales	435,150			154,539			14,201
Change in unrealized gains	(320,413		)	—			—
Investment funds (2)	(212		)	125,423			58,861
Real estate	27,816			12,880			7,757
Loans receivable	2,838			—			—
Other (3)	1,977			20,141			138,519
Net realized and unrealized gains on investments in earnings before OTTI	160,175			335,858			285,119
Other-than-temporary impairments (4)	(5,687		)	—			(18,114		)
Net realized and unrealized gains on investments in earnings	154,488			335,858			267,005
Income tax expense	(32,442		)	(117,550		)	(93,452		)
After-tax net realized and unrealized gains on investments in earnings	$	122,046		$	218,308		$	173,553

Change in unrealized investment (losses) gains of available for sales securities:
Fixed maturity securities	$	(297,084	)	$	(2,192	)	$	(107,094	)
Previously impaired fixed maturity securities	(132		)	895			451
Equity securities available for sale (5)	—			(77,971		)	465,727
Investment funds	(5,521		)	9,843			12,631
Total change in unrealized investment (losses) gains	(302,737		)	(69,425		)	371,715
Income tax benefit (expense)	50,410			17,673			(125,315		)
Noncontrolling interests	(46		)	19			59
After-tax change in unrealized investment (losses) gains of available for sale securities	$	(252,373	)	$	(51,733	)	$	246,459

____________________

(1) The net realized gains or losses on investment sales represent the total gains or losses from the purchase dates of the equity securities. The change in unrealized gains consists of two components: (i) the reversal of the gain or loss recognized in previous periods on equity securities sold and (ii) the change in unrealized gain or loss resulting from mark-to-market adjustments on equity securities still held.

(2) Investment funds includes a gain of $124 million from the sale of an investment in an office building located in Washington, D.C. for the year ended December 31, 2017.

(3) Other includes a gain of $135 million from the sale of Aero Precision Industries and certain related aviation services business for the year ended December 31, 2016.

(4) For the year ended December 31, 2018, OTTI related to fixed maturity securities was $6 million. There were no OTTI for the year ended December 31, 2017. For the year ended December 31, 2016, OTTI related to equity securities was $18 million.

(5) Effective January 1, 2018, the Company adopted new accounting guidance that requires all equity investments with readily determinable fair values (subject to certain exceptions) to be measured at fair value with changes in the fair value recognized in net income. The Company recorded an adjustment of $291 million to opening AOCI net of tax as a result of this guidance. Refer to Note 1 for further information.

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Securities In An Unrealized Loss Position

12 Months Ended

Dec. 31, 2018

Investments, Debt and Equity Securities [Abstract]

Securities In An Unrealized Loss Position

Securities in an Unrealized Loss Position

The following tables summarize all fixed maturity securities in an unrealized loss position at December 31, 2018 and 2017 by the length of time those securities have been continuously in an unrealized loss position.

	Less Than 12 Months				12 Months or Greater				Total
(In thousands)	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
December 31, 2018
U.S. government and government agency	$	195,359	$	933	$	130,815	$	3,977	$	326,174	$	4,910
State and municipal	701,700		6,874		744,905		17,738		1,446,605		24,612
Mortgage-backed securities	334,063		2,911		712,595		21,022		1,046,658		23,933
Asset-backed securities	1,687,665		28,965		342,855		4,722		2,030,520		33,687
Corporate	1,730,513		54,181		954,763		49,129		2,685,276		103,310
Foreign government	246,273		24,197		80,004		914		326,277		25,111
Fixed maturity securities	$	4,895,573	$	118,061	$	2,965,937	$	97,502	$	7,861,510	$	215,563
December 31, 2017
U.S. government and government agency	$	92,167	$	1,491	$	72,055	$	2,341	$	164,222	$	3,832
State and municipal	735,972		5,944		345,755		6,630		1,081,727		12,574
Mortgage-backed securities	480,435		5,110		373,956		11,065		854,391		16,175
Asset-backed securities	1,127,309		8,298		167,412		2,314		1,294,721		10,612
Corporate	1,103,747		8,224		170,858		5,946		1,274,605		14,170
Foreign government	244,139		2,615		25,824		251		269,963		2,866
Fixed maturity securities	$	3,783,769	$	31,682	$	1,155,860	$	28,547	$	4,939,629	$	60,229

Fixed Maturity Securities — A summary of the Company’s non-investment grade fixed maturity securities that were in an unrealized loss position at December 31, 2018 is presented in the table below:

($ in thousands)	Number of Securities	Aggregate Fair Value		Gross Unrealized Loss
Foreign government	13	$	140,854	$	21,411
Corporate	13	120,078		13,111
Asset-backed securities	5	14,662		2,593
Mortgage-backed securities	5	8,741		69
Total	36	$	284,335	$	37,184

For OTTI of fixed maturity securities that management does not intend to sell or, more likely than not, would not be required to sell, the portion of the decline in value considered to be due to credit factors is recognized in earnings and the portion of the decline in value considered to be due to non-credit factors is recognized in other comprehensive income.

For the year ended December 31, 2018, OTTI recognized in earnings for fixed maturity securities was $6 million. For the year ended December 31, 2017, there were no OTTI on fixed maturity securities.

The Company has evaluated its fixed maturity securities in an unrealized loss position and believes the unrealized losses are due primarily to temporary market and sector-related factors rather than to issuer-specific factors. None of these securities are delinquent or in default on financial covenants. Based on its assessment of these issuers, the Company expects them to continue to meet their contractual payment obligations as they become due and does not consider any of these securities to be OTTI.

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Fair Value Measurements

12 Months Ended

Dec. 31, 2018

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements

The Company’s fixed maturity and equity securities classified as available for sale and its trading account securities are carried at fair value. Fair value is defined as “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”. The Company utilizes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value into three broad levels, as follows:

Level 1 - Quoted prices (unadjusted) in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date.  

Level 2 - Quoted prices for similar assets or valuations based on inputs that are observable.

Level 3 - Estimates of fair value based on internal pricing methodologies using unobservable inputs. Unobservable inputs are only used to measure fair value to the extent that observable inputs are not available.

Substantially all of the Company’s fixed maturity securities were priced by independent pricing services. The prices provided by the independent pricing services are estimated based on observable market data in active markets utilizing pricing models and processes, which may include benchmark yields, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers, sector groupings, matrix pricing and reference data. The pricing services may prioritize inputs differently on any given day for any security based on market conditions, and not all inputs are available for each security evaluation on any given day. The pricing services used by the Company have indicated that they will only produce an estimate of fair value if objectively verifiable information is available. The determination of whether markets are active or inactive is based upon the volume and level of activity for a particular asset class. The Company reviews the prices provided by pricing services for reasonableness and periodically performs independent price tests of a sample of securities to ensure proper valuation.

If prices from independent pricing services are not available for fixed maturity securities, the Company estimates the fair value. For Level 2 securities, the Company utilizes pricing models and processes which may include benchmark yields, sector groupings, matrix pricing, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, bids, offers and reference data. Where broker quotes are used, the Company generally requests two or more quotes and sets a price within the range of quotes received based on its assessment of the credibility of the quote and its own evaluation of the security. The Company generally does not adjust quotes received from brokers. For securities traded only in private negotiations, the Company determines fair value based primarily on the cost of such securities, which is adjusted to reflect prices of recent placements of securities of the same issuer, financial projections, credit quality and business developments of the issuer and other relevant information.

For Level 3 securities, the Company generally uses a discounted cash flow model to estimate the fair value of fixed maturity securities. The cash flow models are based upon assumptions as to prevailing credit spreads, interest rate and interest rate volatility, time to maturity and subordination levels. Projected cash flows are discounted at rates that are adjusted to reflect illiquidity, where appropriate.

The following tables present the assets and liabilities measured at fair value as of December 31, 2018 and 2017 by level:

(In thousands)	Total		Level 1		Level 2		Level 3
December 31, 2018
Assets:
Fixed maturity securities available for sale:
U.S. government and government agency	$	702,240	$	—	$	702,240	$	—
State and municipal	3,872,598		—		3,872,598		—
Mortgage-backed securities	1,594,546		—		1,594,546		—
Asset-backed securities	2,438,747		—		2,438,648		99
Corporate	4,111,311		—		4,111,311		—
Foreign government	808,735		—		808,735		—
Total fixed maturity securities available for sale	13,528,177		—		13,528,078		99
Equity securities:
Common stocks	98,192		89,596		—		8,596
Preferred stocks	180,814		—		176,869		3,945
Total equity securities	279,006		89,596		176,869		12,541
Arbitrage trading account	452,548		353,335		81,905		17,308
Total	$	14,259,731	$	442,931	$	13,786,852	$	29,948
Liabilities:
Trading account securities sold but not yet purchased	$	38,120	$	37,327	$	—	$	793
December 31, 2017
Assets:
Fixed maturity securities available for sale:
U.S. government and government agency	$	377,740	$	—	$	377,740	$	—
State and municipal	4,445,094		—		4,445,094		—
Mortgage-backed securities	1,299,931		—		1,299,931		—
Asset-backed securities	2,111,544		—		2,111,372		172
Corporate	4,389,112		—		4,389,112		—
Foreign government	848,497		—		848,497		—
Total fixed maturity securities available for sale	13,471,918		—		13,471,746		172
Equity securities:
Common stocks	352,204		342,834		—		9,370
Preferred stocks	224,443		—		213,600		10,843
Total equity securities	576,647		342,834		213,600		20,213
Arbitrage trading account	617,649		471,420		146,229		—
Total	$	14,666,214	$	814,254	$	13,831,575	$	20,385
Liabilities:
Trading account securities sold but not yet purchased	$	64,358	$	64,358	$	—	$	—

The following tables summarize changes in Level 3 assets and liabilities for the years ended December 31, 2018 and 2017:

	Gains (Losses) Included in:
(In thousands)	Beginning Balance		Earnings (Losses)			Other Comprehensive Income (Losses)		Impairments		Purchases		Sales			Paydowns/Maturities		Transfers In / Out		Ending Balance
Year ended December 31, 2018
Assets:
Fixed maturity securities available for sale:
Asset-backed securities	$	172	$	(2	)	$	46	$	—	$	—	$	(117	)	$	—	$	—	$	99
Total	172		(2		)	46		—		—		(117		)	—		—		99
Equity securities:
Common stocks	9,370		(548		)			—		—		(227		)	—		1		8,596
Preferred stocks	10,843		100			—		—				(6,998		)	—		—		3,945
Total	20,213		(448		)	—		—		—		(7,225		)	—		1		12,541
Arbitrage trading account	—		(6		)	—		—		11,523		(11		)	—		5,802		17,308
Total	$	20,385	$	(456	)	$	46	$	—	$	11,523	$	(7,353	)	$	—	$	5,803	$	29,948
Year ended December 31, 2017
Assets:
Fixed maturity securities available for sale:
Asset-backed securities	$	183	$	3		$	34	$	—	$	—	$	(48	)	$	—	$	—	$	172
Total	183		3			34		—		—		(48		)	—		—		172
Equity securities:
Common stocks	8,754		—			616		—		—		—			—		—		9,370
Preferred stocks	3,662		8			—		—		7,173		—			—		—		10,843
Total	12,416		8			616		—		7,173		—			—		—		20,213
Arbitrage trading account	—		8			—		—		—		(8		)	—		—		—
Total	$	12,599	$	19		$	650	$	—	$	7,173	$	(56	)	$	—	$	—	$	20,385

For the year ended December 31, 2018, one common stock in the arbitrage trading account was transferred into Level 3 and one common stock was transferred out of Level 3. In the case of the transfer into Level 3, a publicly traded price was no longer available and in the case of the transfer out, a publicly traded price became available. For the year ended December 31, 2017, there were no transfers in or out of Level 3.Fair Value of Financial Instruments

The following table presents the carrying amounts and estimated fair values of the Company’s financial instruments as of December 31, 2018 and 2017:

	2018				2017
(In thousands)	Carrying Value		Fair Value		Carrying Value		Fair Value
Assets:
Fixed maturity securities	$	13,606,812	$	13,619,620	$	13,551,250	$	13,566,976
Equity securities	279,006		279,006		576,647		576,647
Arbitrage trading account	452,548		452,548		617,649		617,649
Loans receivable	94,813		97,073		79,684		82,047
Cash and cash equivalents	817,602		817,602		950,471		950,471
Trading accounts receivable from brokers and clearing organizations	347,228		347,228		189,280		189,280
Liabilities:
Due to broker	20,144		20,144		15,920		15,920
Trading account securities sold but not yet purchased	38,120		38,120		64,358		64,358
Subordinated debentures	907,491		840,002		728,218		769,060
Senior notes and other debt	1,882,028		1,968,996		1,769,052		1,945,313

The estimated fair values of the Company’s fixed maturity securities, equity securities available for sale and arbitrage trading account securities are based on various valuation techniques that rely on fair value measurements as described in Note 12 above. The fair value of loans receivable is estimated by using current institutional purchaser yield requirements for loans with similar credit characteristics, which is considered a Level 2 input. The fair value of the senior notes and other debt and the subordinated debentures is based on spreads for similar securities, which is considered a Level 2 input.

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Reserves For Losses And Loss Expenses

12 Months Ended

Dec. 31, 2018

Insurance [Abstract]

Reserves For Losses And Loss Expenses

Reserves for Losses and Loss Expenses

The Company's reserves for losses and loss expenses are comprised of case reserves and incurred but not reported liabilities (IBNR). When a claim is reported, a case reserve is established for the estimated ultimate payment based upon known information about the claim. As more information about the claim becomes available over time, case reserves are adjusted up or down as appropriate. Reserves are also established on an aggregate basis to provide for IBNR liabilities and expected loss reserve development on reported claims.

Loss reserves included in the Company’s financial statements represent management’s best estimates based upon an actuarially derived point estimate and other considerations. The Company uses a variety of actuarial techniques and methods to derive an actuarial point estimate for each operating unit. These methods include paid loss development, incurred loss development, paid and incurred Bornhuetter-Ferguson methods and frequency and severity methods. In circumstances where one actuarial method is considered more credible than the others, that method is used to set the point estimate. The actuarial point estimate may also be based on a judgmental weighting of estimates produced from each of the methods considered. Industry loss experience is used to supplement the Company’s own data in selecting “tail factors” in areas where the Company’s own data is limited. The actuarial data is analyzed by line of business, coverage and accident or policy year, as appropriate, for each operating unit.

The establishment of the actuarially derived loss reserve point estimate also includes consideration of qualitative factors that may affect the ultimate losses. These qualitative considerations include, among others, the impact of re-underwriting initiatives, changes in the mix of business, changes in distribution sources and changes in policy terms and conditions.

The key assumptions used to arrive at the best estimate of loss reserves are the expected loss ratios, rate of loss cost inflation, and reported and paid loss emergence patterns. Expected loss ratios represent management’s expectation of losses at the time the business is priced and written, before any actual claims experience has emerged. This expectation is a significant determinant of the estimate of loss reserves for recently written business where there is little paid or incurred loss data to consider. Expected loss ratios are generally derived from historical loss ratios adjusted for the impact of rate changes, loss cost trends and known changes in the type of risks underwritten. Expected loss ratios are estimated for each key line of business within each operating unit. Expected loss cost inflation is particularly important for the long-tail lines, such as excess casualty, and claims with a high medical component, such as workers’ compensation. Reported and paid loss emergence patterns are used to project current reported or paid loss amounts to their ultimate settlement value. Loss development factors are based on the historical emergence patterns of paid and incurred losses, and are derived from the Company’s own experience and industry data. The paid loss emergence pattern is also significant to excess and assumed workers’ compensation reserves because those reserves are discounted to their estimated present value based upon such estimated payout patterns.

Loss frequency and severity are measures of loss activity that are considered in determining the key assumptions described in our discussion of loss and loss expense reserves, including expected loss ratios, rate of loss cost inflation and reported and paid loss emergence patterns. Loss frequency is a measure of the number of claims per unit of insured exposure, and loss severity is a measure of the average size of claims. Factors affecting loss frequency include the effectiveness of loss controls and safety programs and changes in economic activity or weather patterns. Factors affecting loss severity include changes in policy limits, retentions, rate of inflation and judicial interpretations.

Another factor affecting estimates of loss frequency and severity is the loss reporting lag, which is the period of time between the occurrence of a loss and the date the loss is reported to the Company. The length of the loss reporting lag affects our ability to accurately predict loss frequency (loss frequencies are more predictable for lines with short reporting lags) as well as the amount of reserves needed for incurred but not reported losses (less IBNR is required for lines with short reporting lags). As a result, loss reserves for lines with short reporting lags are likely to have less variation from initial loss estimates. For lines with short reporting lags, which include commercial automobile, primary workers’ compensation, other liability (claims-made) and property business, the key assumption is the loss emergence pattern used to project ultimate loss estimates from known losses paid or reported to date. For lines of business with long reporting lags, which include other liability (occurrence), products liability, excess workers’ compensation and liability reinsurance, the key assumption is the expected loss ratio since there is often little paid or incurred loss data to consider. Historically, the Company has experienced less variation from its initial loss estimates for lines of businesses with short reporting lags than for lines of business with long reporting lags.

The key assumptions used in calculating the most recent estimate of the loss reserves are reviewed each quarter and adjusted, to the extent necessary, to reflect the latest reported loss data, current trends and other factors observed.

A claim may be defined as an event, as a claimant (number of parties claiming damages from an event) or by exposure type (e.g., an event may give rise to two parties, each claiming loss for bodily injury and property damage).

The most commonly used claim count method is by event. Most of the Company's operating units use the number of events to define and quantify the number of claims. However, in certain lines of business, where it is common for multiple parties to claim

damages arising from a single event, an operating unit may quantify claims on the basis of the number of separate parties involved in an event. This may be the case with businesses writing substantial automobile or transportation exposure.

Claim counts for assumed reinsurance will vary based on whether the business is written on a facultative or treaty basis. Further variability as respects treaty claim counts may be reflective of the nature of the treaty, line of business coverage, and type of participation such as quota share or excess of loss contracts. Accordingly, the claim counts have been excluded from the below Reinsurance segment tables due to this variability.

The claim count information set forth in the tables presented below may not provide an accurate reflection of ultimate loss payouts by product line.

The following tables present undiscounted incurred and paid claims development as of December 31, 2018, net of reinsurance, as well as cumulative claim frequency and the total of incurred but not reported liabilities (IBNR). The information about incurred and paid claims development for the years ended December 31, 2009 to 2017 is presented as supplementary information. To enhance the comparability of the loss development data, the Company has removed the impact of foreign exchange rate movements by using the December 31, 2018 exchange rate for all periods. Beginning with accident year 2012, the Company's U.K. and European insurance business is included in the Insurance segment's tables for Other Liability, Professional Liability, Commercial Automobile and Short-Tail Lines. Prior to 2012, the actuarial analysis for its U.K. and European insurance business was performed on an underwriting year basis and accident year data is not available for those years.

Insurance

Other Liability

(In thousands)

Loss and Loss Expenses Incurred, Net of Reinsurance																					As of December 31, 2018
For the Year Ended December 31,
	Unaudited
Accident Year	2009		2010		2011		2012		2013		2014		2015		2016		2017		2018		IBNR		Cumulative Number of Reported Claims
2009	$	689,634	$	656,788	$	624,991	$	599,235	$	589,659	$	561,784	$	557,661	$	553,058	$	546,746	$	542,568	$	18,690	23
2010	—		612,210		615,797		592,117		590,818		577,679		574,780		573,532		571,305		566,695		26,658		23
2011	—		—		665,035		673,730		660,023		659,026		653,864		649,055		645,123		634,264		30,381		24
2012	—		—		—		693,447		702,342		703,118		709,026		713,266		723,610		718,166		47,001		24
2013	—		—		—		—		751,544		792,464		784,906		784,342		805,288		811,592		78,784		26
2014	—		—		—		—		—		847,207		848,947		847,008		851,503		864,157		128,856		26
2015	—		—		—		—		—		—		951,041		986,792		961,289		964,415		217,570		26
2016	—		—		—		—		—		—		—		1,018,454		1,011,368		1,019,749		375,609		25
2017	—		—		—		—		—		—		—		—		1,067,376		1,100,243		567,982		23
2018	—		—		—		—		—		—		—		—		—		1,104,518		837,548		18
Total																			$	8,326,367

Cumulative Paid Claims and Claim Adjustment Expenses, Net of Reinsurance
For the Year Ended December 31,
	Unaudited
Accident Year	2009		2010		2011		2012		2013		2014		2015		2016		2017		2018
2009	$	44,801	$	122,850	$	214,498	$	311,979	$	385,068	$	429,128	$	470,830	$	486,893	$	500,953	$	510,474
2010	—		45,193		128,946		248,698		336,243		417,166		461,442		491,104		508,359		525,016
2011	—		—		48,825		142,713		266,780		379,845		470,849		524,314		556,110		575,194
2012	—		—		—		58,108		158,869		299,842		417,686		513,644		580,750		622,687
2013	—		—		—		—		63,868		189,936		332,871		473,933		589,564		650,428
2014	—		—		—		—		—		79,078		191,394		338,961		481,039		595,024
2015	—		—		—		—		—		—		82,829		210,940		382,498		538,502
2016	—		—		—		—		—		—		—		69,620		209,212		390,552
2017	—		—		—		—		—		—		—		—		80,174		256,448
2018	—		—		—		—		—		—		—		—		—		87,075
Total																			$	4,751,400
	Reserves for loss and loss adjustment expenses before 2009, net of reinsurance																		121,405
	Reserves for loss and loss adjustment expenses, net of reinsurance																		$	3,696,372

Primary Workers' Compensation

(In thousands)

Loss and Loss Expenses Incurred, Net of Reinsurance																					As of December 31, 2018
For the Year Ended December 31,
	Unaudited
Accident Year	2009		2010		2011		2012		2013		2014		2015		2016		2017		2018		IBNR		Cumulative Number of Reported Claims
2009	$	327,537	$	332,303	$	326,766	$	386,870	$	392,158	$	394,303	$	392,287	$	395,288	$	398,994	$	401,431	$	10,693	43
2010	—		358,734		361,808		409,237		418,315		426,622		429,952		429,762		427,698		424,374		13,958		45
2011	—		—		419,364		442,550		454,797		470,026		472,087		474,076		475,729		471,471		17,942		46
2012	—		—		—		499,752		499,882		503,956		503,863		509,167		512,707		508,169		26,626		48
2013	—		—		—		—		551,342		547,295		546,995		543,238		547,000		542,274		35,177		53
2014	—		—		—		—		—		639,436		637,307		627,767		617,242		615,435		57,455		57
2015	—		—		—		—		—		—		712,800		690,525		650,997		641,169		83,941		58
2016	—		—		—		—		—		—		—		702,716		696,339		684,700		117,425		57
2017	—		—		—		—		—		—		—		—		762,093		733,505		191,034		57
2018	—		—		—		—		—		—		—		—		—		778,964		359,337		53
Total																			$	5,801,492

Cumulative Paid Claims and Claim Adjustment Expenses, Net of Reinsurance
For the Year Ended December 31,
	Unaudited
Accident Year	2009		2010		2011		2012		2013		2014		2015		2016		2017		2018
2009	$	93,647	$	197,736	$	257,972	$	297,079	$	317,796	$	333,793	$	344,771	$	352,516	$	360,289	$	364,712
2010	—		107,742		214,034		279,226		317,986		344,631		362,078		374,013		382,665		388,405
2011	—		—		106,157		234,694		307,873		355,909		385,759		408,304		420,945		428,811
2012	—		—		—		114,998		253,781		339,560		387,368		419,588		437,196		451,991
2013	—		—		—		—		117,502		277,538		363,028		414,160		447,894		466,580
2014	—		—		—		—		—		148,405		319,743		412,611		471,235		503,915
2015	—		—		—		—		—		—		139,320		323,744		421,734		477,541
2016	—		—		—		—		—		—		—		142,998		338,835		446,072
2017	—		—		—		—		—		—		—		—		153,456		362,299
2018	—		—		—		—		—		—		—		—		—		171,006
Total																			$	4,061,332
			Reserves for loss and loss adjustment expenses before 2009, net of reinsurance																170,897
			Reserves for loss and loss adjustment expenses, net of reinsurance																$	1,911,057

Excess Workers' Compensation

(In thousands)

Loss and Loss Expenses Incurred, Net of Reinsurance																					As of December 31, 2018
For the Year Ended December 31,
	Unaudited
Accident Year	2009		2010		2011		2012		2013		2014		2015		2016		2017		2018		IBNR		Cumulative Number of Reported Claims
2009	$	168,762	$	153,766	$	153,912	$	148,223	$	148,189	$	138,765	$	142,768	$	134,716	$	129,249	$	130,790	$	21,734	1
2010	—		135,639		123,497		120,272		118,712		100,331		104,732		100,065		94,986		95,374		14,497		1
2011	—		—		88,650		93,993		98,051		87,064		85,299		83,850		78,246		74,109		17,280		1
2012	—		—		—		72,366		73,230		71,780		73,653		72,441		67,878		69,361		16,293		1
2013	—		—		—		—		63,995		48,493		46,025		42,419		38,551		35,120		16,473		1
2014	—		—		—		—		—		63,465		57,558		49,478		45,758		41,671		18,448		1
2015	—		—		—		—		—		—		69,977		57,897		50,099		45,115		25,425		—
2016	—		—		—		—		—		—		—		72,657		70,281		71,404		37,500		—
2017	—		—		—		—		—		—		—		—		76,701		80,508		42,652		1
2018	—		—		—		—		—		—		—		—		—		77,820		46,840		1
Total																			$	721,272

Cumulative Paid Claims and Claim Adjustment Expenses, Net of Reinsurance
For the Year Ended December 31,
	Unaudited
Accident Year	2009		2010		2011		2012		2013		2014		2015		2016		2017		2018
2009	$	5,060	$	8,402	$	11,037	$	14,138	$	20,729	$	25,272	$	29,150	$	33,573	$	37,817	$	41,243
2010	—		2,867		4,003		5,571		8,701		9,084		11,699		14,261		18,821		22,355
2011	—		—		2,593		4,848		6,395		12,104		15,684		18,638		20,164		21,463
2012	—		—		—		1,127		6,097		9,480		11,167		13,234		15,738		17,982
2013	—		—		—		—		647		630		2,158		3,008		3,396		4,418
2014	—		—		—		—		—		358		1,729		3,354		4,175		5,808
2015	—		—		—		—		—		—		2,069		2,481		3,272		4,099
2016	—		—		—		—		—		—		—		2,498		4,783		5,573
2017	—		—		—		—		—		—		—		—		6,282		12,810
2018	—		—		—		—		—		—		—		—		—		6,141
Total																			$	141,892
	Reserves for loss and loss adjustment expenses before 2009, net of reinsurance																		740,877
	Reserves for loss and loss adjustment expenses, net of reinsurance																		$	1,320,257

Professional Liability

(In thousands)

Loss and Loss Expenses Incurred, Net of Reinsurance																					As of December 31, 2018
For the Year Ended December 31,
	Unaudited
Accident Year	2009		2010		2011		2012		2013		2014		2015		2016		2017		2018		IBNR		Cumulative Number of Reported Claims
2009	$	134,784	$	139,091	$	145,515	$	148,899	$	147,994	$	150,452	$	150,783	$	153,492	$	152,711	$	157,451	$	1,087	3
2010	—		147,649		165,755		179,383		177,957		176,723		172,585		174,883		177,844		182,818		1,807		4
2011	—		—		179,875		165,233		186,918		190,096		177,128		173,545		176,865		175,963		3,185		4
2012	—		—		—		238,233		241,944		264,808		250,457		238,704		245,076		243,893		9,507		7
2013	—		—		—		—		269,280		247,320		242,792		248,974		270,449		279,092		15,395		7
2014	—		—		—		—		—		253,284		246,668		259,964		243,936		239,555		19,315		8
2015	—		—		—		—		—		—		259,569		258,251		274,950		276,406		47,934		9
2016	—		—		—		—		—		—		—		310,678		324,979		361,929		90,872		10
2017	—		—		—		—		—		—		—		—		333,803		333,194		178,091		9
2018	—		—		—		—		—		—		—		—		—		335,751		260,095		9
Total																			$	2,586,052

Cumulative Paid Claims and Claim Adjustment Expenses, Net of Reinsurance
For the Year Ended December 31,
	Unaudited
Accident Year	2009		2010		2011		2012		2013		2014		2015		2016		2017		2018
2009	$	12,604	$	52,583	$	85,902	$	117,683	$	127,728	$	138,876	$	143,950	$	144,713	$	147,599	$	151,499
2010	—		14,832		58,916		108,566		129,757		144,474		160,598		165,018		171,330		178,879
2011	—		—		18,779		62,442		103,097		134,608		150,840		159,014		167,286		168,874
2012	—		—		—		21,875		87,008		128,281		159,183		190,295		214,315		223,424
2013	—		—		—		—		24,232		64,030		119,552		177,343		206,655		248,520
2014	—		—		—		—		—		19,545		83,856		138,753		176,181		199,245
2015	—		—		—		—		—		—		20,478		85,561		139,952		187,767
2016	—		—		—		—		—		—		—		28,702		102,853		202,131
2017	—		—		—		—		—		—		—		—		36,733		96,814
2018	—		—		—		—		—		—		—		—		—		28,307
Total																			$	1,685,460
	Reserves for loss and loss adjustment expenses before 2009, net of reinsurance																		4,198
	Reserves for loss and loss adjustment expenses, net of reinsurance																		$	904,790

Commercial Automobile

(In thousands)

Loss and Loss Expenses Incurred, Net of Reinsurance																					As of December 31, 2018
For the Year Ended December 31,
	Unaudited
Accident Year	2009		2010		2011		2012		2013		2014		2015		2016		2017		2018		IBNR		Cumulative Number of Reported Claims
2009	$	362,302	$	345,139	$	340,967	$	335,851	$	337,915	$	336,855	$	334,652	$	335,089	$	334,977	$	334,926	$	398	39
2010	—		310,591		320,098		330,190		328,854		332,716		331,581		330,552		330,263		329,942		372		37
2011	—		—		312,224		320,898		328,269		331,694		341,362		341,162		342,052		343,524		1,232		37
2012	—		—		—		314,073		326,585		342,379		355,433		364,175		364,437		366,662		1,539		40
2013	—		—		—		—		326,789		348,513		368,318		376,569		366,976		366,565		3,013		42
2014	—		—		—		—		—		363,308		384,692		418,215		416,194		413,697		6,431		45
2015	—		—		—		—		—		—		389,101		417,403		423,601		431,857		18,247		50
2016	—		—		—		—		—		—		—		431,633		431,680		443,030		35,867		49
2017	—		—		—		—		—		—		—		—		430,352		428,601		70,289		44
2018	—		—		—		—		—		—		—		—		—		442,862		145,744		39
Total																			$	3,901,666

Cumulative Paid Claims and Claim Adjustment Expenses, Net of Reinsurance
For the Year Ended December 31,
	Unaudited
Accident Year	2009		2010		2011		2012		2013		2014		2015		2016		2017		2018
2009	$	136,433	$	209,553	$	257,326	$	291,925	$	312,902	$	328,843	$	331,482	$	333,143	$	333,605	$	333,677
2010	—		136,029		208,790		263,639		295,347		313,253		324,963		326,770		327,206		327,829
2011	—		—		135,350		211,756		262,659		296,332		321,786		333,949		338,283		340,319
2012	—		—		—		136,844		215,078		273,277		312,178		344,428		355,740		360,799
2013	—		—		—		—		142,480		218,005		266,694		322,141		343,274		353,159
2014	—		—		—		—		—		155,065		237,118		328,156		365,424		394,147
2015	—		—		—		—		—		—		159,679		265,396		325,369		370,450
2016	—		—		—		—		—		—		—		185,045		280,146		342,214
2017	—		—		—		—		—		—		—		—		180,627		267,469
2018	—		—		—		—		—		—		—		—		—		180,213
Total																			$	3,270,276
			Reserves for loss and loss adjustment expenses before 2009, net of reinsurance																2,482
			Reserves for loss and loss adjustment expenses, net of reinsurance																$	633,872

Short-tail lines

(In thousands)

Loss and Loss Expenses Incurred, Net of Reinsurance																					As of December 31, 2018
For the Year Ended December 31,
	Unaudited
Accident Year	2009		2010		2011		2012		2013		2014		2015		2016		2017		2018		IBNR		Cumulative Number of Reported Claims
2009	$	346,870	$	335,921	$	326,440	$	318,111	$	318,349	$	314,290	$	314,117	$	314,010	$	316,220	$	317,098	$	550	18
2010	—		385,541		370,291		358,373		355,916		346,226		346,719		346,885		346,463		346,172		833		19
2011	—		—		478,556		471,555		463,006		459,814		457,011		450,115		449,320		451,211		1,093		21
2012	—		—		—		526,312		535,500		535,885		531,729		507,646		506,705		508,565		3,083		25
2013	—		—		—		—		572,103		583,603		575,582		553,621		552,137		548,730		5,740		26
2014	—		—		—		—		—		701,335		709,832		664,303		663,282		664,350		6,562		30
2015	—		—		—		—		—		—		743,872		731,468		727,677		726,606		15,079		32
2016	—		—		—		—		—		—		—		771,416		774,514		761,891		20,857		34
2017	—		—		—		—		—		—		—		—		750,786		752,193		34,275		38
2018	—		—		—		—		—		—		—		—		—		759,340		161,107		36
Total																			$	5,836,156

Cumulative Paid Claims and Claim Adjustment Expenses, Net of Reinsurance
For the Year Ended December 31,
	Unaudited
Accident Year	2009		2010		2011		2012		2013		2014		2015		2016		2017		2018
2009	$	212,521	$	291,338	$	304,634	$	306,020	$	309,916	$	310,428	$	311,079	$	311,357	$	311,655	$	315,966
2010	—		245,036		325,156		337,686		346,768		340,210		342,918		344,102		345,085		345,106
2011	—		—		303,012		417,701		436,585		440,777		445,073		446,745		447,342		450,155
2012	—		—		—		281,456		453,157		503,364		513,733		498,506		499,446		503,738
2013	—		—		—		—		312,945		486,692		534,939		531,386		538,158		539,443
2014	—		—		—		—		—		371,194		596,829		613,621		633,020		648,373
2015	—		—		—		—		—		—		396,086		612,335		667,846		689,875
2016	—		—		—		—		—		—		—		416,144		669,029		710,618
2017	—		—		—		—		—		—		—		—		444,407		688,821
2018	—		—		—		—		—		—		—		—		—		415,206
Total																			$	5,307,301
	Reserves for loss and loss adjustment expenses before 2009, net of reinsurance																		2,362
	Reserves for loss and loss adjustment expenses, net of reinsurance																		$	531,217

Reinsurance

Casualty

(In thousands)

Loss and Loss Expenses Incurred, Net of Reinsurance																					As of December 31, 2018
For the Year Ended December 31,
	Unaudited
Accident Year	2009		2010		2011		2012		2013		2014		2015		2016		2017		2018		IBNR
2009	$	334,804	$	328,321	$	327,236	$	309,228	$	301,495	$	293,275	$	282,411	$	288,115	$	281,592	$	279,372	$	17,086
2010	—		290,285		298,300		288,141		276,234		265,771		254,550		251,308		249,062		248,145		18,428
2011	—		—		290,635		309,621		304,409		299,628		306,911		303,867		295,576		292,162		21,264
2012	—		—		—		331,603		335,661		331,006		324,014		332,932		335,636		333,889		25,536
2013	—		—		—		—		319,159		270,221		273,528		283,580		292,447		298,061		33,269
2014	—		—		—		—		—		320,250		320,176		319,855		331,836		326,251		49,301
2015	—		—		—		—		—		—		259,609		232,203		231,020		253,264		30,511
2016	—		—		—		—		—		—		—		241,282		253,450		246,235		62,140
2017	—		—		—		—		—		—		—		—		231,826		221,820		122,752
2018	—		—		—		—		—		—		—		—		—		221,945		184,317
Total																			$	2,721,144

Cumulative Paid Claims and Claim Adjustment Expenses, Net of Reinsurance
For the Year Ended December 31,
	Unaudited
Accident Year	2009		2010		2011		2012		2013		2014		2015		2016		2017		2018
2009	$	21,332	$	53,636	$	85,761	$	124,030	$	155,124	$	181,946	$	196,775	$	211,143	$	221,141	$	228,990
2010	—		17,964		45,626		77,191		106,381		129,041		149,322		165,027		180,544		190,295
2011	—		—		17,876		52,365		97,702		134,285		168,244		191,864		207,692		220,011
2012	—		—		—		22,390		62,198		111,928		151,635		186,483		219,106		240,926
2013	—		—		—		—		28,920		63,849		109,202		143,268		177,101		204,820
2014	—		—		—		—		—		21,306		69,134		116,266		155,764		198,993
2015	—		—		—		—		—		—		17,865		48,593		91,548		141,834
2016	—		—		—		—		—		—		—		19,923		61,930		100,587
2017	—		—		—		—		—		—		—		—		16,493		40,338
2018	—		—		—		—		—		—		—		—		—		11,152
Total																			$	1,577,946
	Reserves for loss and loss adjustment expenses before 2009, net of reinsurance																		369,801
			Reserves for loss and loss adjustment expenses, net of reinsurance																$	1,512,999

Property

(In thousands)

Loss and Loss Expenses Incurred, Net of Reinsurance																					As of December 31, 2018
For the Year Ended December 31,
	Unaudited
Accident Year	2009		2010		2011		2012		2013		2014		2015		2016		2017		2018		IBNR
2009	$	48,029	$	43,193	$	42,352	$	38,711	$	38,124	$	37,505	$	36,913	$	36,263	$	35,293	$	35,763	$	—
2010	—		58,576		55,647		52,561		51,448		51,500		50,971		50,871		50,699		50,932		201
2011	—		—		95,217		87,970		85,118		86,544		85,006		84,739		84,471		84,882		314
2012	—		—		—		103,744		94,720		86,426		85,451		83,925		83,938		84,875		626
2013	—		—		—		—		141,298		112,590		114,063		111,915		112,555		111,876		1,192
2014	—		—		—		—		—		112,987		96,668		97,363		100,148		99,410		1,739
2015	—		—		—		—		—		—		127,039		117,582		131,777		130,452		4,367
2016	—		—		—		—		—		—		—		167,989		174,562		181,858		11,130
2017	—		—		—		—		—		—		—		—		206,604		200,535		24,102
2018	—		—		—		—		—		—		—		—		—		108,281		40,135
Total																			$	1,088,864

Cumulative Paid Claims and Claim Adjustment Expenses, Net of Reinsurance
For the Year Ended December 31,
	Unaudited
Accident Year	2009		2010		2011		2012		2013		2014		2015		2016		2017		2018
2009	$	9,766	$	21,945	$	28,226	$	29,444	$	31,248	$	31,238	$	32,540	$	34,759	$	34,027	$	35,158
2010	—		23,654		37,739		42,413		43,898		44,824		46,419		49,048		49,303		50,053
2011	—		—		31,478		58,875		73,359		76,010		78,577		81,780		82,322		83,401
2012	—		—		—		15,675		51,774		64,238		70,672		77,540		79,099		81,808
2013	—		—		—		—		36,609		74,602		92,646		101,553		104,333		106,051
2014	—		—		—		—		—		38,919		67,000		82,329		88,507		91,646
2015	—		—		—		—		—		—		53,498		89,228		109,187		118,686
2016	—		—		—		—		—		—		—		78,969		133,653		157,622
2017	—		—		—		—		—		—		—		—		72,157		141,458
2018	—		—		—		—		—		—		—		—		—		34,125
Total																			$	900,008
	Reserves for loss and loss adjustment expenses before 2009, net of reinsurance																		776
	Reserves for loss and loss adjustment expenses, net of reinsurance																		$	189,632

The reconciliation of the net incurred and paid claims development tables to the reserves for loss and loss adjustment expenses in the consolidated balance sheet is as follows:

(In thousands)		December 31, 2018
Undiscounted reserves for loss and loss expenses, net of reinsurance:
	Other liability	$	3,696,372
	Primary workers' compensation	1,911,057
	Excess workers' compensation	1,320,257
	Professional liability	904,790
	Commercial automobile	633,872
	Short-tail lines	531,217
	Other	111,779
	Insurance	9,109,344
	Casualty	1,512,999
	Property	189,632
	Reinsurance	1,702,631
Total undiscounted reserves for loss and loss expenses, net of reinsurance		$	10,811,975

(In thousands)		December 31, 2018
Due from reinsurers on unpaid claims:
	Other liability	$	451,073
	Primary workers' compensation	374,805
	Excess workers' compensation	37,405
	Professional liability	344,958
	Commercial automobile	15,405
	Short-tail lines	293,376
	Other	34,260
	Insurance	1,551,282
	Casualty	116,782
	Property	49,501
	Reinsurance	166,283
Total due from reinsurers on unpaid claims		$	1,717,565

(In thousands)		December 31, 2018
Loss reserve discount:
	Other liability	$	—
	Primary workers' compensation	—
	Excess workers' compensation	(434,302		)
	Professional liability	—
	Commercial automobile	—
	Short-tail lines	—
	Other	—
	Insurance	(434,302		)
	Casualty	(128,790		)
	Property	—
	Reinsurance	(128,790		)
Total loss reserve discount		$	(563,092	)
Total gross reserves for loss and loss expenses		$	11,966,448

The following is supplementary information regarding average historical claims duration as of December 31, 2018:

Insurance
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance
Years	1		2		3		4		5		6		7		8		9		10
Other liability	8.0	%	14.4	%	18.4	%	16.8	%	13.8	%	8.2	%	5.9	%	3.0	%	2.8	%	1.8	%
Primary workers' compensation	22.5	%	27.6	%	15.6	%	9.4	%	5.9	%	4.0	%	2.8	%	1.9	%	1.6	%	1.1	%
Excess workers' compensation	3.8	%	3.3	%	2.7	%	3.1	%	3.0	%	3.3	%	2.7	%	3.3	%	3.5	%	2.6	%
Professional liability	8.7	%	22.7	%	22.3	%	16.6	%	9.4	%	9.1	%	3.5	%	1.6	%	4.3	%	2.5	%
Commercial automobile	39.7	%	21.6	%	15.6	%	10.7	%	6.8	%	3.5	%	1.0	%	0.4	%	0.2	%	—	%
Short-tail lines	59.6	%	29.8	%	5.8	%	1.6	%	0.1	%	0.3	%	0.4	%	0.3	%	—	%	1.4	%
Reinsurance
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance
Years	1		2		3		4		5		6		7		8		9		10
Casualty	7.2	%	12.5	%	14.6	%	13.3	%	11.2	%	9.0	%	5.9	%	5.2	%	3.8	%	2.8	%
Property	35.3	%	32.3	%	14.8	%	5.5	%	3.9	%	2.0	%	3.2	%	2.7	%	—	%	3.2	%

The table below provides a reconciliation of the beginning and ending reserve balances:

(In thousands)	2018			2017			2016
Net reserves at beginning of year	$	10,056,914		$	9,590,265		$	9,244,872
Net provision for losses and loss expenses:
Claims occurring during the current year (1)	3,926,489			3,963,543			3,826,620
Increase (decrease) in estimates for claims occurring in prior years (2)	6,831			(5,165		)	(29,904		)
Loss reserve discount accretion	41,382			43,970			49,084
Total	3,974,702			4,002,348			3,845,800
Net payments for claims:
Current year	964,808			1,027,405			1,052,452
Prior year	2,700,077			2,562,550			2,401,722
Total	3,664,885			3,589,955			3,454,174
Foreign currency translation	(117,848		)	54,256			(46,233		)
Net reserves at end of year	10,248,883			10,056,914			9,590,265
Ceded reserve at end of year	1,717,565			1,613,494			1,606,930
Gross reserves at end of year	$	11,966,448		$	11,670,408		$	11,197,195

_______________________________________

(1) Claims occurring during the current year are net of loss reserve discounts of $24,381,000, $22,064,000 and $18,929,000 in 2018, 2017, and 2016, respectively.

(2) The increase (decrease) in estimates for claims occurring in prior years is net of loss reserve discount. On an undiscounted basis, the estimates for claims occurring in prior years decreased by $3,738,000, $32,132,000 and $59,175,000 in 2018, 2017 and 2016, respectively.

Favorable prior year development (net of additional and return premiums) was $39 million in 2018.

Insurance - Reserves for the Insurance segment developed favorably by $43 million in 2018. The favorable development was primarily attributable to workers' compensation business, partially offset by unfavorable development for professional liability business.

For workers' compensation, the favorable development was spread across many accident years, including prior to 2009, but was most significant in accident years 2015 through 2017. The favorable workers' compensation development reflects a continuation during 2018 of the benign loss cost trends experienced during recent years, particularly the favorable claim frequency trends (i.e., number of reported claims per unit of exposure). The long term trend of declining workers' compensation frequency can be attributable to improved workplace safety. Loss severity trends were also aided by our continued investment in claims handling initiatives such as medical case management services and vendor savings through usage of preferred provider networks. Reported workers' compensation losses in 2018 continued to be better than our expectations at most of our operating units, and were below the assumptions underlying our previous reserve estimates.

For professional liability business, adverse development was primarily related to unexpected large directors and officers (“D&O”) liability losses at one of our U.S. operating units, as well as lawyers professional liability losses at another operating unit. The adverse development stemmed primarily from accident years 2015 and 2016, and was driven by a higher frequency of large losses than we had experienced in previous years.

Reinsurance - Reserves for the Reinsurance segment developed unfavorably by $4 million in 2018. The unfavorable development was primarily due to U.S. casualty facultative business from accident years 2009 and prior related to construction projects, and was largely offset by favorable development on assumed excess of loss workers compensation business.

Favorable prior year development (net of additional and return premiums) was $37 million in 2017.

Insurance - Reserves for the Insurance segment developed favorably by $68 million in 2017. The favorable development was primarily attributable to workers' compensation business, and was partially offset by unfavorable development for professional liability business.

For workers' compensation, the favorable development was related to both primary and excess business and was spread across many accident years, including those prior to 2008, but was most significant in accident years 2014 through 2016. The favorable workers' compensation development reflects a continuation during 2017 of the generally benign loss cost trends experienced in recent years, particularly the favorable claim frequency trends (i.e. number of reported claims per unit of exposure). Reported workers' compensation losses in 2017 continued to be better than our expectations at most of our operating units, and were below the assumptions underlying our previous reserve estimates. The favorable severity trends were also impacted by our continued investment in medical case management services and the higher usage of preferred provider networks. The long term trend of declining workers' compensation frequency can be attributed to improved workplace safety.

For professional liability business, adverse development was primarily related to unexpected large D&O liability losses at one of our U.S. operating units, and large professional indemnity and D&O losses in the U.K. The adverse development stemmed mainly from accident years 2013 through 2016 in the U.S. and 2011 through 2016 in the U.K.

Reinsurance - Reserves for the Reinsurance segment developed unfavorably by $31 million in 2017. This adverse development was due to reserve strengthening associated with claims impacted by the change in the Ogden discount rate in the U.K., as well as adverse development on the U.S. facultative casualty excess of loss business. The Ogden rate is the discount rate used to calculate lump-sum bodily injury payouts in the U.K., and was reduced by the U.K. Ministry of Justice from +2.5% to -0.75% in 2017; the adverse development mostly related to U.K. motor bodily injury claims which we reinsured on an excess of loss basis in accident years 2012 through 2016. The adverse development on U.S. facultative casualty business was due to construction related risks in accident years 2008 and prior.

Favorable prior year development (net of additional and return premiums) was $59 million in 2016.

    Insurance - Reserves for the Insurance segment developed favorably by $53 million in 2016. The favorable development was primarily related to workers' compensation business, and was partially offset by unfavorable development for medical professional liability business.

For workers' compensation, the favorable development was related to both primary and excess business and to many accident years, including those prior to 2007. During 2016, reported workers' compensation losses continued to be better than our expectations at most of our operating units. Loss frequency and severity trends continued to be better than the assumptions underlying our previous reserve estimates. Loss severity trends also benefited from our continued investment in medical case management services and from our preferred provider networks. The long term trend of declining workers' compensation frequency can be attributed to improved workplace safety.

For medical professional liability business, unfavorable development was primarily related to a class of business that has been discontinued. The adverse development for that business stemmed mainly from accident years 2010 through 2015.

Reinsurance - Reserves for the Reinsurance segment developed favorably by $6 million in 2016. The favorable development was primarily related to direct facultative reinsurance business and to accident years 2008 through 2014.

Environmental and Asbestos — To date, known environmental and asbestos claims have not had a material impact on the Company’s operations, because its subsidiaries generally did not insure large industrial companies that are subject to significant environmental or asbestos exposures prior to 1986 when an absolute exclusion was incorporated into standard policy language.

The Company’s net reserves for losses and loss expenses relating to asbestos and environmental claims on policies written before adoption of the absolute exclusion was $28 million at December 31, 2018 and $30 million at December 31, 2017. The estimation of these liabilities is subject to significantly greater than normal variation and uncertainty because it is difficult to make an actuarial estimate of these liabilities due to the absence of a generally accepted actuarial methodology for these exposures and the potential effect of significant unresolved legal matters, including coverage issues, as well as the cost of litigating the legal issues. Additionally, the determination of ultimate damages and the final allocation of such damages to financially responsible parties are highly uncertain.

Discounting — The Company discounts its liabilities for certain workers’ compensation reserves. The amount of workers’ compensation reserves that were discounted was $1,793 million and $1,855 million at December 31, 2018 and 2017, respectively. The aggregate net discount for those reserves, after reflecting the effects of ceded reinsurance, was $563 million and $591 million at

December 31, 2018 and 2017, respectively. At December 31, 2018, discount rates by year ranged from 2.0% to 6.5%, with a weighted average discount rate of 3.8%.

Substantially all discounted workers’ compensation reserves (97% of total discounted reserves at December 31, 2018) are excess workers’ compensation reserves. In order to properly match loss expenses with income earned on investment securities supporting the liabilities, reserves for excess workers’ compensation business are discounted using risk-free discount rates determined by reference to the U.S. Treasury yield curve. These rates are determined annually based on the weighted average rate for the period. Once established, no adjustments are made to the discount rate for that period, and any increases or decreases in loss reserves in subsequent years are discounted at the same rate, without regard to when any such adjustments are recognized. The expected loss and loss expense payout patterns subject to discounting are derived from the Company’s loss payout experience.  

The Company also discounts reserves for certain other long-duration workers’ compensation reserves (representing approximately 3% of total discounted reserves at December 31, 2018), including reserves for quota share reinsurance and reserves related to losses regarding occupational lung disease. These reserves are discounted at statutory rates prescribed or permitted by the Department of Insurance of the State of Delaware.

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Reinsurance

12 Months Ended

Dec. 31, 2018

Reinsurance Disclosures [Abstract]

Reinsurance

Reinsurance

The Company reinsures a portion of its insurance exposures in order to reduce its net liability on individual risks and catastrophe losses. Reinsurance coverage and retentions vary depending on the line of business, location of the risk and nature of loss. The Company’s reinsurance purchases include the following: property reinsurance treaties that reduce exposure to large individual property losses and catastrophe events; casualty reinsurance treaties that reduce its exposure to large individual casualty losses, workers’ compensation catastrophe losses and casualty losses involving multiple claimants or insureds; and facultative reinsurance that reduces exposure on individual policies or risks for losses that exceed treaty reinsurance capacity. Depending on the operating unit, the Company purchases specific additional reinsurance to supplement the above programs.

The following is a summary of reinsurance financial information:

(In thousands)	2018			2017			2016
Written premiums:
Direct	$	6,973,216		$	6,726,029		$	6,647,600
Assumed	729,278			750,934			896,101
Ceded	(1,269,267		)	(1,216,455		)	(1,119,788		)
Total net written premiums	$	6,433,227		$	6,260,508		$	6,423,913
Earned premiums:
Direct	$	6,851,795		$	6,661,046		$	6,492,240
Assumed	755,759			812,309			900,570
Ceded	(1,236,049		)	(1,161,936		)	(1,099,462		)
Total net earned premiums	$	6,371,505		$	6,311,419		$	6,293,348
Ceded losses and loss expenses incurred	$	829,742		$	601,769		$	707,336
Ceded commission earned	$	268,037		$	241,983		$	201,957

The Company reinsures a portion of its exposures principally to reduce its net liability on individual risks and to protect against catastrophic losses. Estimated amounts due from reinsurers are reported net of reserves for uncollectible reinsurance of $946,965, $1,010,000 and $1,049,000 as of December 31, 2018, 2017 and 2016, respectively.

The following table presents the amounts due from reinsurers as of December 31, 2018:

(In thousands)
Lloyd’s of London	$	215,370
Munich Re	164,131
Alleghany Group	150,438
Swiss Re	150,280
Partner Re	103,837
Berkshire Hathaway	87,314
Axis Capital	85,377
Hannover Re Group	77,351
Everest Re	62,113
Korean Re	52,746
Renaissance Re	39,944
Liberty Mutual	32,118
Qatar Re GRP	27,731
Chubb Limited	24,628
Arch Capital Group	21,260
Other reinsurers less than $20,000	289,305
Subtotal	1,583,943
Residual market pools	348,348
Total	$	1,932,291

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Indebtedness

12 Months Ended

Dec. 31, 2018

Debt Disclosure [Abstract]

Indebtedness

Indebtedness

Indebtedness consisted of the following as of December 31, 2018 (the difference between the face value and the carrying value is unamortized discount and debt issuance costs):

				Carrying Value
(In thousands)	Interest Rate	Face Value		2018		2017
Senior notes due on:
August 15, 2019	6.15%	$	140,651	$	140,568	$	140,434
September 15, 2019	7.375%	300,000		299,816		299,562
September 15, 2020	5.375%	300,000		299,420		299,083
January 1, 2022	8.7%	76,503		76,273		76,210
March 15, 2022	4.625%	350,000		348,670		348,252
February 15, 2037	6.25%	250,000		248,006		247,896
August 1, 2044	4.75%	350,000		345,283		345,099
Subsidiary debt (1) (2)	Various	123,992		123,992		12,516
Total senior notes and other debt		$	1,891,146	$	1,882,028	$	1,769,052
Subordinated debentures due on:
April 30, 2053	5.625%	$	350,000	$	341,097	$	340,838
March 1, 2056	5.9%	110,000		106,159		106,055
June 1, 2056	5.75%	290,000		281,551		281,325
March 30, 2058	5.70%	185,000		178,684		—
Total subordinated debentures		$	935,000	$	907,491	$	728,218

________________

(1) Subsidiary debt is due as follows: $7 million in 2019, $15 million in 2020, and $102 million in 2028.

(2) Includes non-recourse loan in the amount of $102 million secured by an office building. See Note 8, Real Estate, for more details.

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Income Taxes

12 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

Income tax expense (benefit) consists of:

(In thousands)	Current Expense (Benefit)		Deferred Expense (Benefit)			Total
December 31, 2018
Domestic	$	188,712	$	(63,134	)	$	125,578
Foreign	13,963		23,487			37,450
Total expense (benefit)	$	202,675	$	(39,647	)	$	163,028
December 31, 2017
Domestic	$	225,694	$	(27,601	)	$	198,093
Foreign	8,803		12,537			21,340
Total expense (benefit)	$	234,497	$	(15,064	)	$	219,433
December 31, 2016
Domestic	$	259,539	$	3,355		$	262,894
Foreign	23,634		6,425			30,059
Total expense	$	283,173	$	9,780		$	292,953

Income before income taxes from domestic operations was $755 million, $797 million and $837 million for the years ended December 31, 2018, 2017 and 2016, respectively. Income (loss) before income taxes from foreign operations was $57 million, ($25) million and $59 million for the years ended December 31, 2018, 2017 and 2016, respectively.

A reconciliation of the income tax expense and the amounts computed by applying the Federal and foreign income tax rate of 21% for 2018 and 35% for 2017 and 2016 to pre-tax income are as follows:

(In thousands)	2018			2017			2016
Computed “expected” tax expense	$	170,540		$	270,470		$	313,753
Tax-exempt investment income	(18,833		)	(37,209		)	(37,379		)
Change in valuation allowance	18,576			11,161			1,420
Impact of foreign tax rates	7,683			3,508			1,984
State and local taxes	3,901			1,644			7,748
Impact of change in U.S. tax rate	(10,950		)	(30,531		)	—
Other, net	(7,889		)	390			5,427
Total expense	$	163,028		$	219,433		$	292,953

At December 31, 2018 and 2017, the tax effects of differences that give rise to significant portions of the deferred tax asset and deferred tax liability are as follows:

(In thousands)	2018			2017
Deferred tax asset:
Loss reserve discounting	$	130,513		$	70,206
Unearned premiums	112,190			110,854
Net operating losses	37,463			33,043
Other-than-temporary impairments	9,910			8,204
Employee compensation plans	56,027			59,037
Other	58,809			49,346
Gross deferred tax asset	404,912			330,690
Less valuation allowance	(35,195		)	(16,619		)
Deferred tax asset	369,717			314,071
Deferred tax liability:
Amortization of intangibles	13,641			12,826
Loss reserve discounting - transition rule	41,088			—
Deferred policy acquisition costs	99,293			100,020
Unrealized investment gains	35,430			151,162
Property, furniture and equipment	39,239			31,865
Investment funds	51,712			41,104
Other	53,824			63,858
Deferred tax liability	334,227			400,835
Net deferred tax (asset) liability	$	(35,490	)	$	86,764

The Company had a current tax receivable of $0.7 million and a payable of $11.3 million at December 31, 2018 and 2017, respectively. At December 31, 2018, the Company had foreign net operating loss carryforwards of $8.8 million that expire beginning in 2027, and an additional $181.0 million that have no expiration date. At December 31, 2018, the Company had a valuation allowance of $35.2 million, as compared to $16.6 million at December 31, 2017. The Company has provided a valuation allowance against the utilization of foreign tax credits and the future net operating loss carryforward benefits of certain foreign operations. The statute of limitations has closed for the Company’s U.S. Federal tax returns through December 31, 2013.

The realization of the deferred tax asset is dependent upon the Company’s ability to generate sufficient taxable income in future periods. Based on historical results and the prospects for future current operations, management anticipates that it is more likely than not that future taxable income will be sufficient for the realization of this asset.

The Tax Cuts and Jobs Act of 2017 (the "Tax Act") was enacted on December 22, 2017. The Tax Act provides for a reduction of the U.S. corporate income tax rate from 35% to 21% effective January 1, 2018. In 2018, the Company reported a net tax rate reduction benefit in the amount of $11.0 million. Additionally, the U.S. tax law requires insurance reserves to be discounted for tax purposes. The Tax Act modified this computation. At the end of 2018, the IRS issued revised discount factors to be applied to the 2017 reserves. This increased the beginning of year 2018 deferred tax asset for loss reserve discounting by $47 million. Under the related transition rule, a deferred tax liability was established which will be included in taxable income over eight years beginning in 2018.

The Tax Act included a global intangible low-taxed income tax ("GILTI"). The Company has made an accounting policy election to treat any GILTI taxes as a current period expense when incurred (the "period cost method"). The 2018 tax provision includes a GILTI tax of $2.8 million as a current tax expense.

The Company has not provided U.S. deferred income taxes on the undistributed earnings of approximately $70 million of its non-U.S. subsidiaries since these earnings are intended to be permanently reinvested in the non-U.S. subsidiaries. In the future, if such earnings were distributed the Company projects that the incremental tax, if any, will be immaterial.

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Dividends From Subsidiaries And Statutory Financial Information

12 Months Ended

Dec. 31, 2018

Insurance [Abstract]

Dividends From Subsidiaries And Statutory Financial Information

Dividends from Subsidiaries and Statutory Financial Information

The Company’s insurance subsidiaries are restricted by law as to the amount of dividends they may pay without the approval of regulatory authorities. The Company’s lead insurer, Berkley Insurance Company ("BIC"), directly or indirectly owns all of the Company’s other insurance companies. During 2019, the maximum amount of dividends that can be paid by BIC without such approval is approximately $1.1 billion.

BIC’s combined net income and statutory capital and surplus, as determined in accordance with statutory accounting practices (SAP), are as follows:

(In thousands)	2018		2017		2016
Net income	$	1,099,953	$	698,862	$	702,830
Statutory capital and surplus	$	5,587,930	$	5,479,603	$	5,493,044

The significant variances between SAP and GAAP are that for statutory purposes bonds are carried at amortized cost, unrealized gains and losses on equity securities are recorded in surplus, acquisition costs are charged to income as incurred, deferred Federal income taxes are subject to limitations, excess and assumed workers’ compensation reserves are discounted at different discount rates and certain assets designated as “non-admitted assets” are charged against surplus. The Commissioner of Insurance of the State of Delaware has allowed BIC to discount non-tabular workers' compensation loss reserves, which is a permitted practice that differs from SAP. The effect of using this permitted practice was an increase to BIC’s statutory capital and surplus by $282 million at December 31, 2018.

The National Association of Insurance Commissioners (“NAIC”) has risk-based capital (“RBC”) requirements that require insurance companies to calculate and report information under a risk-based formula which measures statutory capital and surplus needs based on a regulatory definition of risk in a company’s mix of products and its balance sheet. This guidance is used to calculate two capital measurements: Total Adjusted Capital and RBC Authorized Control Level. Total Adjusted Capital is equal to the Company’s statutory capital and surplus excluding capital and surplus derived from the use of permitted practices that differ from statutory accounting practices. RBC Authorized Control Level is the capital level used by regulatory authorities to determine whether remedial action is required. Generally, no remedial action is required if Total Adjusted Capital is 200% or more of the RBC Authorized Control Level. At December 31, 2018, BIC’s Total Adjusted Capital of $5.306 billion was 384% of its RBC Authorized Control Level.

See Note 3, Investments in Fixed Maturity Securities, for a description of assets held on deposit as security.

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Common Stockholders' Equity

12 Months Ended

Dec. 31, 2018

Equity [Abstract]

Common Stockholders' Equity

Common Stockholders’ Equity

The weighted average number of shares used in the computation of net income per share was as follows:

	2018	2017	2016
Basic	126,698,927	124,843,240	122,650,997
Diluted	128,263,558	129,017,613	128,552,838

Treasury shares have been excluded from average outstanding shares from the date of acquisition. The weighted average number of basic shares outstanding includes the impact of 4,926,521 common shares held in a grantor trust. The common shares held in the grantor trust are for delivery upon settlement of vested but mandatorily deferred restricted stock units ("RSUs"). Shares held by the grantor trust do not affect diluted shares outstanding since shares deliverable under vested RSUs were already included in diluted shares outstanding. The difference in calculating basic and diluted net income per share is attributable entirely to the dilutive effect of stock-based compensation plans. Changes in shares of common stock outstanding, net of treasury shares, are presented below. Shares of common stock issued and outstanding do not include shares related to unissued restricted stock units (including shares held in the grantor trust).

	2018		2017		2016
Balance, beginning of year	121,514,852		121,193,599		123,307,837
Shares issued	838,508		1,052,256		281,654
Shares repurchased	(357,600	)	(731,003	)	(2,395,892)
Balance, end of year	121,995,760		121,514,852		121,193,599

The amount of dividends paid is dependent upon factors such as the receipt of dividends from our subsidiaries, our results of operations, cash flow, financial condition and business needs, the capital and surplus requirements of our subsidiaries, and applicable insurance regulations that limit the amount of dividends that may be paid by our regulated insurance subsidiaries.

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Fair Value Of Financial Instruments

12 Months Ended

Dec. 31, 2018

Fair Value Disclosures [Abstract]

Fair Value Of Financial Instruments

Fair Value Measurements

The Company’s fixed maturity and equity securities classified as available for sale and its trading account securities are carried at fair value. Fair value is defined as “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”. The Company utilizes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value into three broad levels, as follows:

Level 1 - Quoted prices (unadjusted) in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date.  

Level 2 - Quoted prices for similar assets or valuations based on inputs that are observable.

Level 3 - Estimates of fair value based on internal pricing methodologies using unobservable inputs. Unobservable inputs are only used to measure fair value to the extent that observable inputs are not available.

Substantially all of the Company’s fixed maturity securities were priced by independent pricing services. The prices provided by the independent pricing services are estimated based on observable market data in active markets utilizing pricing models and processes, which may include benchmark yields, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers, sector groupings, matrix pricing and reference data. The pricing services may prioritize inputs differently on any given day for any security based on market conditions, and not all inputs are available for each security evaluation on any given day. The pricing services used by the Company have indicated that they will only produce an estimate of fair value if objectively verifiable information is available. The determination of whether markets are active or inactive is based upon the volume and level of activity for a particular asset class. The Company reviews the prices provided by pricing services for reasonableness and periodically performs independent price tests of a sample of securities to ensure proper valuation.

If prices from independent pricing services are not available for fixed maturity securities, the Company estimates the fair value. For Level 2 securities, the Company utilizes pricing models and processes which may include benchmark yields, sector groupings, matrix pricing, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, bids, offers and reference data. Where broker quotes are used, the Company generally requests two or more quotes and sets a price within the range of quotes received based on its assessment of the credibility of the quote and its own evaluation of the security. The Company generally does not adjust quotes received from brokers. For securities traded only in private negotiations, the Company determines fair value based primarily on the cost of such securities, which is adjusted to reflect prices of recent placements of securities of the same issuer, financial projections, credit quality and business developments of the issuer and other relevant information.

For Level 3 securities, the Company generally uses a discounted cash flow model to estimate the fair value of fixed maturity securities. The cash flow models are based upon assumptions as to prevailing credit spreads, interest rate and interest rate volatility, time to maturity and subordination levels. Projected cash flows are discounted at rates that are adjusted to reflect illiquidity, where appropriate.

The following tables present the assets and liabilities measured at fair value as of December 31, 2018 and 2017 by level:

(In thousands)	Total		Level 1		Level 2		Level 3
December 31, 2018
Assets:
Fixed maturity securities available for sale:
U.S. government and government agency	$	702,240	$	—	$	702,240	$	—
State and municipal	3,872,598		—		3,872,598		—
Mortgage-backed securities	1,594,546		—		1,594,546		—
Asset-backed securities	2,438,747		—		2,438,648		99
Corporate	4,111,311		—		4,111,311		—
Foreign government	808,735		—		808,735		—
Total fixed maturity securities available for sale	13,528,177		—		13,528,078		99
Equity securities:
Common stocks	98,192		89,596		—		8,596
Preferred stocks	180,814		—		176,869		3,945
Total equity securities	279,006		89,596		176,869		12,541
Arbitrage trading account	452,548		353,335		81,905		17,308
Total	$	14,259,731	$	442,931	$	13,786,852	$	29,948
Liabilities:
Trading account securities sold but not yet purchased	$	38,120	$	37,327	$	—	$	793
December 31, 2017
Assets:
Fixed maturity securities available for sale:
U.S. government and government agency	$	377,740	$	—	$	377,740	$	—
State and municipal	4,445,094		—		4,445,094		—
Mortgage-backed securities	1,299,931		—		1,299,931		—
Asset-backed securities	2,111,544		—		2,111,372		172
Corporate	4,389,112		—		4,389,112		—
Foreign government	848,497		—		848,497		—
Total fixed maturity securities available for sale	13,471,918		—		13,471,746		172
Equity securities:
Common stocks	352,204		342,834		—		9,370
Preferred stocks	224,443		—		213,600		10,843
Total equity securities	576,647		342,834		213,600		20,213
Arbitrage trading account	617,649		471,420		146,229		—
Total	$	14,666,214	$	814,254	$	13,831,575	$	20,385
Liabilities:
Trading account securities sold but not yet purchased	$	64,358	$	64,358	$	—	$	—

The following tables summarize changes in Level 3 assets and liabilities for the years ended December 31, 2018 and 2017:

	Gains (Losses) Included in:
(In thousands)	Beginning Balance		Earnings (Losses)			Other Comprehensive Income (Losses)		Impairments		Purchases		Sales			Paydowns/Maturities		Transfers In / Out		Ending Balance
Year ended December 31, 2018
Assets:
Fixed maturity securities available for sale:
Asset-backed securities	$	172	$	(2	)	$	46	$	—	$	—	$	(117	)	$	—	$	—	$	99
Total	172		(2		)	46		—		—		(117		)	—		—		99
Equity securities:
Common stocks	9,370		(548		)			—		—		(227		)	—		1		8,596
Preferred stocks	10,843		100			—		—				(6,998		)	—		—		3,945
Total	20,213		(448		)	—		—		—		(7,225		)	—		1		12,541
Arbitrage trading account	—		(6		)	—		—		11,523		(11		)	—		5,802		17,308
Total	$	20,385	$	(456	)	$	46	$	—	$	11,523	$	(7,353	)	$	—	$	5,803	$	29,948
Year ended December 31, 2017
Assets:
Fixed maturity securities available for sale:
Asset-backed securities	$	183	$	3		$	34	$	—	$	—	$	(48	)	$	—	$	—	$	172
Total	183		3			34		—		—		(48		)	—		—		172
Equity securities:
Common stocks	8,754		—			616		—		—		—			—		—		9,370
Preferred stocks	3,662		8			—		—		7,173		—			—		—		10,843
Total	12,416		8			616		—		7,173		—			—		—		20,213
Arbitrage trading account	—		8			—		—		—		(8		)	—		—		—
Total	$	12,599	$	19		$	650	$	—	$	7,173	$	(56	)	$	—	$	—	$	20,385

For the year ended December 31, 2018, one common stock in the arbitrage trading account was transferred into Level 3 and one common stock was transferred out of Level 3. In the case of the transfer into Level 3, a publicly traded price was no longer available and in the case of the transfer out, a publicly traded price became available. For the year ended December 31, 2017, there were no transfers in or out of Level 3.Fair Value of Financial Instruments

The following table presents the carrying amounts and estimated fair values of the Company’s financial instruments as of December 31, 2018 and 2017:

	2018				2017
(In thousands)	Carrying Value		Fair Value		Carrying Value		Fair Value
Assets:
Fixed maturity securities	$	13,606,812	$	13,619,620	$	13,551,250	$	13,566,976
Equity securities	279,006		279,006		576,647		576,647
Arbitrage trading account	452,548		452,548		617,649		617,649
Loans receivable	94,813		97,073		79,684		82,047
Cash and cash equivalents	817,602		817,602		950,471		950,471
Trading accounts receivable from brokers and clearing organizations	347,228		347,228		189,280		189,280
Liabilities:
Due to broker	20,144		20,144		15,920		15,920
Trading account securities sold but not yet purchased	38,120		38,120		64,358		64,358
Subordinated debentures	907,491		840,002		728,218		769,060
Senior notes and other debt	1,882,028		1,968,996		1,769,052		1,945,313

The estimated fair values of the Company’s fixed maturity securities, equity securities available for sale and arbitrage trading account securities are based on various valuation techniques that rely on fair value measurements as described in Note 12 above. The fair value of loans receivable is estimated by using current institutional purchaser yield requirements for loans with similar credit characteristics, which is considered a Level 2 input. The fair value of the senior notes and other debt and the subordinated debentures is based on spreads for similar securities, which is considered a Level 2 input.

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Lease Obligations	12 Months Ended
	Dec. 31, 2018
Leases [Abstract]
Lease Obligations	Lease ObligationsThe Company and its subsidiaries use office space and equipment under leases expiring at various dates. These leases are considered operating leases for financial reporting purposes. Some of these leases have options to extend the length of the leases and contain clauses for cost of living, operating expense and real estate tax adjustments. Future minimum lease payments, without provision for sublease income, are: $46,592,000 in 2019; $43,504,000 in 2020; $39,061,000 in 2021; $34,444,000 in 2022, $30,881,000 in 2023 and $75,740,000 thereafter. Rental expense was $45,778,000, $52,925,000, and $47,453,000 for 2018, 2017, and 2016 respectively.

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Commitments, Litigation And Contingent Liabilities

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments, Litigation And Contingent Liabilities

Commitments, Litigation and Contingent Liabilities

In the ordinary course of business, the Company is subject to disputes, litigation and arbitration arising from its insurance and reinsurance businesses. These matters are generally related to insurance and reinsurance claims and are considered in the establishment of loss and loss expense reserves. In addition, the Company may also become involved in legal actions which seek extra-contractual damages, punitive damages or penalties, including claims alleging bad faith in handling of insurance claims. The Company expects its ultimate liability with respect to such matters will not be material to its financial condition. However, adverse outcomes on such matters are possible, from time to time, and could be material to the Company’s results of operations in any particular financial reporting period.

At December 31, 2018, the Company had commitments to invest up to $270.2 million and $253.4 million in certain investment funds and real estate construction projects, respectively.

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Stock Incentive Plan

12 Months Ended

Dec. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock Incentive Plan

Stock Incentive Plan

Pursuant to the Company's stock incentive plan, the Company may issue restricted stock units ("RSUs") to employees of the Company and its subsidiaries. The RSUs generally vest three to five years from the award date and are subject to other vesting and forfeiture provisions contained in the award agreement. The following table summarizes RSU information for the three years ended December 31, 2018:

	2018		2017		2016
RSUs granted and unvested at beginning of period:	3,477,981		4,862,098		4,158,325
Granted	760,032		855,984		1,000,559
Vested	(600,169	)	(1,993,507	)	(77,250	)
Canceled	(263,411	)	(246,594	)	(219,536	)
RSUs granted and unvested at end of period:	3,374,433		3,477,981		4,862,098

Upon vesting, shares of the Company’s common stock equal to the number of vested RSUs are issued or deferred to a later date, depending on the terms of the specific award agreement. As of December 31, 2018, 4,709,318 RSUs had been deferred. RSUs that have not yet vested and vested RSUs that have been deferred are not considered to be issued and outstanding shares.

The fair value of RSUs at the date of grant are recorded as unearned compensation, a component of stockholders’ equity, and expensed over the vesting period. Following is a summary of changes in unearned compensation for the three years ended December 31, 2018:

(In thousands)	2018			2017			2016
Unearned compensation at beginning of year	$	122,910		$	115,965		$	103,538
RSUs granted, net of cancellations	52,204			52,897			52,697
RSUs expensed	(34,408		)	(38,796		)	(35,585		)
RSUs forfeitures	(11,037		)	(7,156		)	(4,685		)
Unearned compensation at end of year	$	129,669		$	122,910		$	115,965

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Compensation Plans

12 Months Ended

Dec. 31, 2018

Compensation Related Costs [Abstract]

Compensation Plans

Compensation Plans

The Company and its subsidiaries have profit sharing plans in which substantially all employees participate. The plans provide for minimum annual contributions of 5% of eligible compensation; contributions above the minimum are discretionary and vary with each participating subsidiary’s profitability. Employees become eligible to participate in the plan on the first day of the calendar quarter following the first full calendar quarter after the employee's date of hire provided the employee has completed 250 hours of service during the calendar quarter. The plans provide that 40% of the contributions vest immediately and that the remaining 60% vest at varying percentages based upon years of service. Profit sharing expense was $42 million, $42 million and $39 million in 2018, 2017 and 2016, respectively.

The Company has a long-term incentive compensation plan ("LTIP") that provides for compensation to key executives based on the growth in the Company's book value per share over a five year period.

The following table summarizes the outstanding LTIP awards as of December 31, 2018:

	Units Outstanding	Maximum Value		Inception to date earned through December 31, 2018 on outstanding units
2014 grant	181,750	$	18,175,000	$	15,328,795
2015 grant	194,750	19,475,000		15,272,295
2016 grant	217,500	21,750,000		12,371,400
2017 grant	223,250	22,325,000		7,822,680
2018 grant	222,750	22,750,000		4,316,895

The following table summarizes the LTIP expense for each of the three years ended December 31, 2018:

(In thousands)	2018			2017		2016
2011 grant	$	—		$	—	$	(82	)
2013 grant	(1,124		)	7,667		8,918
2014 grant	3,227			3,167		3,503
2015 grant	5,170			3,667		4,072
2016 grant	5,148			3,601		4,002
2017 grant	4,700			3,162		—
2018 grant	4,317			—		—
Total	$	21,438		$	21,264	$	20,413

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Supplemental Financial Statement Data

12 Months Ended

Dec. 31, 2018

Other Income and Expenses [Abstract]

Supplemental Financial Statement Data

Supplemental Financial Statement Data

Other operating costs and expenses consist of the following:

(In thousands)	2018			2017		2016
Amortization of deferred policy acquisition costs	$	915,246		$	1,111,489	$	1,155,954
Insurance operating expenses	1,183,635			989,535		933,249
Insurance service expenses	118,357			129,776		138,908
Net foreign currency (gains) losses	(27,067		)	15,267		(11,904		)
Other costs and expenses	193,050			190,865		179,412
Total	$	2,383,221		$	2,436,932	$	2,395,619

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Industry Segments

12 Months Ended

Dec. 31, 2018

Segment Reporting [Abstract]

Industry Segments

Industry Segments

The Company’s reportable segments include the following two business segments, plus a corporate segment:

• Insurance - predominantly commercial insurance business, including excess and surplus lines, admitted lines and specialty personal lines throughout the United States, as well as insurance business in the United Kingdom, Continental Europe, South America, Canada, Mexico, Scandinavia, Asia and Australia.

• Reinsurance - reinsurance business on a facultative and treaty basis, primarily in the United States, United Kingdom, Continental Europe, Australia, the Asia-Pacific region and South Africa.

The accounting policies of the segments are the same as those described in the summary of significant accounting policies. Income tax expense and benefits are calculated based upon the Company’s overall effective tax rate.

Summary financial information about the Company’s reporting segments is presented in the following table. Income before income taxes by segment includes allocated investment income. Identifiable assets by segment are those assets used in or allocated to the operation of each segment.

	Revenues
(In thousands)	Earned Premiums		Investment Income		Other		Total (1)		Pre-Tax Income (Loss)			Net Income (Loss) to Common Stockholders
Year ended December 31, 2018
Insurance	$	5,864,981	$	518,733	$	72,727	$	6,456,441	$	856,011		$	682,028
Reinsurance	506,524		94,291		—		600,815		62,144			50,144
Corporate, other and eliminations (2)	—		61,211		418,696		479,907		(260,549		)	(213,469		)
Net investment gains	—		—		154,488		154,488		154,488			122,046
Consolidated	$	6,371,505	$	674,235	$	645,911	$	7,691,651	$	812,094		$	640,749
Year ended December 31, 2017
Insurance	$	5,706,443	$	436,178	$	86,864	$	6,229,485	$	756,153		$	535,186
Reinsurance	604,976		91,146		—		696,122		(15,276		)	(5,131		)
Corporate, other and eliminations (2)	—		48,464		374,835		423,299		(303,965		)	(199,269		)
Net investment gains	—		—		335,858		335,858		335,858			218,308
Consolidated	$	6,311,419	$	575,788	$	797,557	$	7,684,764	$	772,770		$	549,094
Year ended December 31, 2016
Insurance	$	5,618,842	$	431,489	$	97,879	$	6,148,210	$	799,139		$	534,613
Reinsurance	674,506		102,617		—		777,123		98,277			68,400
Corporate, other and eliminations (2)	—		30,057		431,789		461,846		(267,983		)	(174,650		)
Net investment gains	—		—		267,005		267,005		267,005			173,553
Consolidated	$	6,293,348	$	564,163	$	796,673	$	7,654,184	$	896,438		$	601,916

Identifiable Assets
(In thousands)	December 31,
	2018		2017
Insurance	$	19,634,329	$	19,263,193
Reinsurance	2,951,115		3,169,731
Corporate, other and eliminations (2)	2,310,533		1,866,993
Consolidated	$	24,895,977	$	24,299,917

_______________________________________

(1) Revenues for Insurance includes $714.2 million, $688.2 million and $733.3 million in 2018, 2017 and 2016, respectively, from foreign countries. Revenues for Reinsurance includes $228.1 million, $201.3 million and $200.5 million in 2018, 2017 and 2016, respectively, from foreign countries.

(2) Corporate, other and eliminations represent corporate revenues and expenses and other items that are not allocated to business segments.

Net premiums earned by major line of business are as follows:

(In thousands)	2018		2017		2016
Insurance
Other liability	$	1,912,071	$	1,843,826	$	1,761,748
Workers' compensation	1,489,805		1,481,507		1,402,611
Short-tail lines	1,184,755		1,149,977		1,237,917
Commercial automobile	722,236		685,263		684,626
Professional liability	556,114		545,870		531,940
Total Insurance	5,864,981		5,706,443		5,618,842
Reinsurance
Casualty	362,886		377,650		405,470
Property	143,638		227,326		269,036
Total Reinsurance	506,524		604,976		674,506
Total	$	6,371,505	$	6,311,419	$	6,293,348

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Quarterly Financial Information (Unaudited)

12 Months Ended

Dec. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Information (Unaudited)

Quarterly Financial Information (Unaudited)

The following is a summary of quarterly financial data:

(In thousands, except per share data)	2018
Three months ended	March 31		June 30		September 30		December 31
Revenues	$	1,891,247	$	1,910,916	$	1,937,902	$	1,951,586
Net income	166,397		180,075		161,920		132,357
Net income per share (1)
Basic (2)	1.32		1.42		1.28		1.04
Diluted	1.30		1.40		1.26		1.03

	2017
Three months ended	March 31		June 30		September 30		December 31
Revenues	$	1,870,418	$	1,848,049	$	2,031,342	$	1,934,956
Net income	123,447		109,004		162,054		154,589
Net income per share (1)
Basic (2)	1.01		0.87		1.29		1.22
Diluted	0.96		0.85		1.26		1.21

_______________________________________

(1) Net income per share (“EPS”) in each quarter is computed using the weighted-average number of shares outstanding during that quarter, while EPS for the full year is computed using the weighted-average number of shares outstanding during the year. Thus, the sum of the four quarters EPS does not necessarily equal the full-year EPS.

(2) Basic shares outstanding includes shares held in a grantor trust.

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Schedule II - Condensed Financial Information of Registrant

12 Months Ended

Dec. 31, 2016

Condensed Financial Information of Parent Company Only Disclosure [Abstract]

Schedule II - Condensed Financial Information of Registrant

Schedule II

W. R. Berkley Corporation

Condensed Financial Information of Registrant

Balance Sheets (Parent Company)

	December 31,
(In thousands)	2018			2017
Assets:
Cash and cash equivalents	$	83,950		$	45,062
Fixed maturity securities available for sale at fair value (cost $1,317,058 and $1,059,834 at December 31, 2018 and 2017, respectively)	1,307,347			1,052,240
Loans receivable	51,544			53,019
Equity securities, at fair value (cost $3,430 in 2018 and 2017)	3,430			3,430
Investment in subsidiaries	6,786,999			7,140,108
Current federal income taxes	9,068			—
Deferred federal income taxes	66,995			—
Property, furniture and equipment at cost, less accumulated depreciation	13,391			14,421
Other assets	12,340			10,819
Total assets	$	8,335,064		$	8,319,099
Liabilities and stockholders’ equity
Liabilities:
Due to subsidiaries	$	116,125		$	232,756
Other liabilities	115,562			128,002
Current federal income taxes	—			10,486
Deferred federal income taxes	—			51,757
Subordinated debentures	907,491			728,218
Senior notes	1,758,035			1,756,536
Total liabilities	2,897,213			2,907,755
Stockholders’ equity:
Preferred stock	—			—
Common stock	47,024			47,024
Additional paid-in capital	1,063,144			1,048,283
Retained earnings (including accumulated undistributed net income of subsidiaries of $5,068,139 and $5,073,268 at December 31, 2018 and 2017, respectively)	7,558,619			6,956,882
Accumulated other comprehensive income	(510,470		)	68,541
Treasury stock, at cost	(2,720,466		)	(2,709,386		)
Total stockholders’ equity	5,437,851			5,411,344
Total liabilities and stockholders’ equity	$	8,335,064		$	8,319,099

________________

See Report of Independent Registered Public Accounting Firm and note to condensed financial statements.

Schedule II, Continued

W. R. Berkley Corporation

Condensed Financial Information of Registrant, Continued

Statements of Income (Parent Company)

	Year Ended December 31,
(In thousands)	2018			2017			2016
Management fees and investment income including dividends from subsidiaries of $639,477, $694,462 and $700,664 for the years ended December 31, 2018, 2017 and 2016, respectively	$	697,687		$	738,923		$	726,742
Net investment (losses) gains	(1,685		)	(4,286		)	909
Other income	530			805			376
Total revenues	696,532			735,442			728,027
Operating costs and expense	191,873			182,145			171,967
Interest expense	155,082			146,929			139,216
Income before federal income taxes	349,577			406,368			416,844
Federal income taxes:
Federal income taxes provided by subsidiaries on a separate return basis	409,439			115,597			327,520
Federal income tax expense on a consolidated return basis	(113,138		)	(195,261		)	(246,389		)
Net expense (benefit)	296,301			(79,664		)	81,131
Income before undistributed equity in net income of subsidiaries	645,878			326,704			497,975
Equity in undistributed net (loss) income of subsidiaries	(5,129		)	222,390			103,941
Net income	$	640,749		$	549,094		$	601,916

________________

See Report of Independent Registered Public Accounting Firm and note to condensed financial statements.

Schedule II, Continued

W. R. Berkley Corporation

Condensed Financial Information of Registrant, Continued

Statements of Cash Flows (Parent Company)

	Year Ended December 31,
(In thousands)	2018			2017			2016
Cash flows from operating activities:
Net income	$	640,749		$	549,094		$	601,916
Adjustments to reconcile net income to net cash from operating activities:
Net investment losses	1,685			4,286			3,649
Depreciation and amortization	9,441			2,039			2,744
Equity in undistributed earnings of subsidiaries	5,129			(222,390		)	(103,941		)
Tax payments received from subsidiaries	282,084			98,313			414,386
Federal income taxes provided by subsidiaries on a separate return basis	(409,439		)	(115,597		)	(327,520		)
Stock incentive plans	28,531			38,075			37,174
Change in:
Federal income taxes	(77,415		)	2,711			44,839
Other assets	1,348			(877		)	1,772
Other liabilities	109,016			18,661			(88,282		)
Accrued investment income	(2,870		)	(2,818		)	(2,743		)
Net cash from operating activities	588,259			371,497			583,994
Cash used in investing activities:
Proceeds from sales of fixed maturity securities	668,447			849,330			373,252
Proceeds from maturities and prepayments of fixed maturity securities	255,528			316,611			210,904
Cost of purchases of fixed maturity securities	(1,188,821		)	(1,329,379		)	(1,285,101		)
Change in loans receivable	1,475			(29,600		)	(23,419		)
Investments in and advances to subsidiaries, net	(184,597		)	(21,139		)	11,471
Net additions to real estate, furniture & equipment	(264		)	(1,055		)	(3,042		)
Net cash used in investing activities	(448,232		)	(215,232		)	(715,935		)
Cash (used in) from financing activities:
Net proceeds from issuance of senior notes	178,562			—			386,830
Repayment of senior notes	—			—			(9,353		)
Purchase of common treasury shares	(24,750		)	(47,807		)	(132,392		)
Cash dividends to common stockholders	(254,951		)	(188,199		)	(183,999		)
Net cash (used in) from financing activities	(101,139		)	(236,006		)	61,086
Net increase (decrease) in cash and cash equivalents	38,888			(79,741		)	(70,855		)
Cash and cash equivalents at beginning of year	45,062			124,803			195,658
Cash and cash equivalents at end of year	$	83,950		$	45,062		$	124,803

________________

See Report of Independent Registered Public Accounting Firm and note to condensed financial statements.

W. R. Berkley Corporation

Condensed Financial Information of Registrant, Continued

December 31, 2018

Note to Condensed Financial Statements (Parent Company)

The accompanying condensed financial statements should be read in conjunction with the notes to consolidated financial statements included elsewhere herein. Reclassifications have been made in the 2017 and 2016 financial statements as originally reported to conform them to the presentation of the 2018 financial statements.

The Company files a consolidated federal tax return with the results of its domestic insurance subsidiaries included on a statutory basis. Under present Company policy, federal income taxes payable by subsidiary companies on a separate-return basis are paid to W. R. Berkley Corporation, and the Company pays the tax due on a consolidated return basis.

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Schedule III - Supplementary Insurance Information

12 Months Ended

Dec. 31, 2018

Supplementary Insurance Information [Abstract]

Schedule III - Supplementary Insurance Information

Schedule III

W. R. Berkley Corporation and Subsidiaries

Supplementary Insurance Information

December 31, 2018, 2017 and 2016

(In thousands)	Deferred Policy Acquisition Cost		Reserve for Losses and Loss Expenses		Unearned Premiums		Net Premiums Earned		Net Investment Income		Loss and Loss Expenses		Amortization of Deferred Policy Acquisition Cost		Other Operating Costs and Expenses		Net Premiums Written
December 31, 2018
Insurance	$	439,945	$	10,226,324	$	3,131,018	$	5,864,981	$	518,733	$	3,626,924	$	811,178	$	1,162,328	$	5,952,861
Reinsurance	57,684		1,740,124		228,973		506,524		94,291		347,778		104,068		86,826		480,366
Corporate and adjustments	—		—		—		—		61,211		—		—		218,821		—
Total	$	497,629	$	11,966,448	$	3,359,991	$	6,371,505	$	674,235	$	3,974,702	$	915,246	$	1,467,975	$	6,433,227
December 31, 2017
Insurance	$	435,967	$	9,820,258	$	3,039,343	$	5,706,443	$	436,178	$	3,516,996	$	929,793	$	1,026,545	$	5,715,871
Reinsurance	71,582		1,850,150		250,837		604,976		91,146		485,352		181,696		44,349		544,637
Corporate and adjustments	—		—		—		—		48,464		—		—		254,549		—
Total	$	507,549	$	11,670,408	$	3,290,180	$	6,311,419	$	575,788	$	4,002,348	$	1,111,489	$	1,325,443	$	6,260,508
December 31, 2016
Insurance	$	442,317	$	9,445,210	$	2,975,060	$	5,618,842	$	431,489	$	3,430,139	$	964,064	$	954,858	$	5,743,620
Reinsurance	95,573		1,751,985		308,240		674,506		102,617		415,661		191,890		71,305		680,293
Corporate and adjustments	—		—		—		—		30,057		—		—		213,502		—
Total	$	537,890	$	11,197,195	$	3,283,300	$	6,293,348	$	564,163	$	3,845,800	$	1,155,954	$	1,239,665	$	6,423,913

__________________________

See Report of Independent Registered Public Accounting Firm.

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Schedule IV - Reinsurance

12 Months Ended

Dec. 31, 2018

Supplemental Schedule of Reinsurance Premiums for Insurance Companies [Abstract]

Schedule IV - Reinsurance

Schedule IV

W. R. Berkley Corporation and Subsidiaries

Reinsurance

Years ended December 31, 2018, 2017 and 2016

	Premiums Written
(In thousands, other than percentages)	Direct Amount		Ceded to Other Companies		Assumed from Other Companies		Net Amount		Percentage of Amount Assumed to Net
Year ended December 31, 2018
Insurance	$	6,959,830	$	1,204,509	$	197,540	$	5,952,861	3.3	%
Reinsurance	13,386		64,758		531,738		480,366		110.7	%
Total	$	6,973,216	$	1,269,267	$	729,278	$	6,433,227	11.3	%
Year ended December 31, 2017
Insurance	$	6,707,916	$	1,153,960	$	161,915	$	5,715,871	2.8	%
Reinsurance	18,113		62,495		589,019		544,637		108.1	%
Total	$	6,726,029	$	1,216,455	$	750,934	$	6,260,508	12.0	%
Year ended December 31, 2016
Insurance	$	6,634,540	$	1,051,887	$	160,967	$	5,743,620	2.8	%
Reinsurance	13,060		67,901		735,134		680,293		108.1	%
Total	$	6,647,600	$	1,119,788	$	896,101	$	6,423,913	13.9	%

___________________________

See Report of Independent Registered Public Accounting Firm.

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Schedule V - Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2018

Valuation and Qualifying Accounts [Abstract]

Schedule V - Valuation and Qualifying Accounts

Schedule V

W. R. Berkley Corporation and Subsidiaries

Valuation and Qualifying Accounts

Years ended December 31, 2018, 2017 and 2016

(In thousands)	Opening Balance		Additions- Charged to Expense			Deduction- Amounts Written Off			Ending Balance
Year ended December 31, 2018
Premiums and fees receivable	$	39,926	$	6,985		$	(7,817	)	$	39,093
Due from reinsurers	1,010		65			(128		)	947
Deferred federal and foreign income taxes	16,619		18,772			(196		)	35,195
Loan loss reserves	3,383		—			—			3,383
Total	$	60,938	$	25,822		$	(8,141	)	$	78,618
Year ended December 31, 2017
Premiums and fees receivable	$	26,569	$	20,720		$	(7,363	)	$	39,926
Due from reinsurers	1,049		(29		)	(10		)	1,010
Deferred federal and foreign income taxes	5,457		12,663			(1,501		)	16,619
Loan loss reserves	3,397		(14		)	—			3,383
Total	$	36,472	$	33,340		$	(8,874	)	$	60,938
Year ended December 31, 2016
Premiums and fees receivable	$	22,524	$	10,006		$	(5,961	)	$	26,569
Due from reinsurers	1,020		20			9			1,049
Deferred federal and foreign income taxes	4,037		1,420			—			5,457
Loan loss reserves	2,094		1,303			—			3,397
Total	$	29,675	$	12,749		$	(5,952	)	$	36,472

_______________________

See Report of Independent Registered Public Accounting Firm.

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Schedule VI - Supplementary Information Concerning Property-Casualty Insurance Operations

12 Months Ended

Dec. 31, 2018

Supplemental Information for Property, Casualty Insurance Underwriters [Abstract]

Schedule VI - Supplementary Information Concerning Property-Casualty Insurance Operations

Schedule VI

W. R. Berkley Corporation and Subsidiaries

Supplementary Information Concerning Property-Casualty Insurance Operations

Years Ended December 31, 2018, 2017 and 2016

(In thousands)	2018		2017			2016
Deferred policy acquisition costs	$	497,629	$	507,549		$	537,890
Reserves for losses and loss expenses	11,966,448		11,670,408			11,197,195
Unearned premiums	3,359,991		3,290,180			3,283,300
Net premiums earned	6,371,505		6,311,419			6,293,348
Net investment income	674,235		575,788			564,163
Losses and loss expenses incurred:
Current year	3,926,489		3,963,543			3,826,620
Prior years	6,831		(5,165		)	(29,904		)
Loss reserve discount accretion	41,382		43,970			49,084
Amortization of deferred policy acquisition costs	915,246		1,111,489			1,155,954
Paid losses and loss expenses	3,664,885		3,589,955			3,454,174
Net premiums written	6,433,227		6,260,508			6,423,913

___________________

See Report of Independent Registered Public Accounting Firm.

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Subsequent Event	12 Months Ended
	Dec. 31, 2018
Subsequent Events [Abstract]
Subsequent Event	Subsequent EventOn February 21, 2019, the Company announced that its Board of Directors approved a 3-for-2 common stock split to be paid in the form of a stock dividend to holders of record on March 14, 2019. The additional shares are expected to be issued on April 2, 2019.

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Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2018

Accounting Policies [Abstract]

Principles of consolidation and basis of presentation

Principles of consolidation and basis of presentation The consolidated financial statements, which include the accounts of W. R. Berkley Corporation and its subsidiaries (the "Company"), have been prepared on the basis of U.S. generally accepted accounting principles ("GAAP"). All significant intercompany transactions and balances have been eliminated. Reclassifications have been made in the 2017 and 2016 financial statements to conform to the presentation of the 2018 financial statements. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the revenues and expenses reflected during the reporting period. The most significant items on our balance sheet that involve a greater degree of accounting estimates that are subject to change in the future are the valuation of investments, other-than-temporary impairments, loss and loss expense reserves and premium estimates. Actual results could differ from those estimates.

Revenue recognition

Revenue recognition

Insurance premiums are recognized as written at the inception of the policy. Reinsurance premiums are estimated based upon information received from ceding companies, and subsequent differences from such estimates are recorded in the period they are determined. Insurance and reinsurance premiums are primarily earned on a pro rata basis over the policy term. Fees for services are earned over the period that the services are provided.

Audit premiums are recognized when they are reliably determinable. The change in accruals for earned but unbilled audit premiums (decreased) increased net premiums written and premiums earned by $(4) million, $8 million and $8 million in 2018, 2017 and 2016, respectively.

Revenues from non-insurance businesses are derived from businesses engaged in the distribution of promotional merchandise, world-wide textile solutions, and aircraft services provided to the general, commercial and military aviation markets. These aircraft services include (i) the distribution, manufacturing, repair and overhaul of aircraft parts and components, (ii) the sale of new and used aircraft, and (iii) avionics, fuel, maintenance, storage and charter services. Revenue is recognized upon the shipment of products and parts, the delivery of aircraft, the delivery of fuel, and over the completion period of services.

Insurance service fee revenue represents servicing fees for program administration and claims management services provided by the Company, including workers' compensation assigned risk plans, as well as insurance brokerage and risk management services. Fees for program administration, claims management and risk management services are primarily recognized ratably over the related contract period for which the underlying services are rendered. Commissions for insurance brokerage are generally recognized when the underlying insurance policy is effective.

Cash and cash equivalents

Cash and cash equivalentsCash equivalents consist of funds invested in money market accounts and investments with an effective maturity of three months or less when purchased.

Investments

Investments

Fixed maturity securities classified as available for sale are carried at estimated fair value, with unrealized gains and losses, net of applicable income taxes, excluded from earnings and reported as a component of comprehensive income and a separate component of stockholders' equity. Fixed maturity securities that the Company has the positive intent and ability to hold to maturity are classified as held to maturity and reported at amortized cost. Investment income from fixed maturity securities is recognized based on the constant effective yield method. Premiums and discounts on mortgage-backed securities are adjusted for the effects of actual and anticipated prepayments on a retrospective basis.

Equity securities with readily determinable fair values are measured at fair value, with changes in the fair value recognized in net income within net realized and unrealized gains on investments. (See (Q) Recent accounting pronouncements.)

Fixed maturity securities that the Company purchased with the intent to sell in the near-term are classified as trading account securities and are reported at estimated fair value. Realized and unrealized gains and losses from trading activity are reported as net investment income and are recorded at the trade date. Short sales and short call options are presented as trading

securities sold but not yet purchased. Unsettled trades and the net margin balances held by the clearing broker are presented as a trading account receivable from brokers and clearing organizations.

Investment funds are carried under the equity method of accounting. The Company's share of the earnings or losses of investment funds is primarily reported on a one-quarter lag in order to facilitate the timely completion of the Company's consolidated financial statements.

Loans receivable primarily represent commercial real estate mortgage loans and bank loans and are carried at amortized cost. The Company monitors the performance of its loans receivable and establishes an allowance for loan losses for loans where the Company determines it is probable that the contractual terms will not be met, with a corresponding charge to earnings. For loans that are evaluated individually and deemed to be impaired, the Company establishes a specific allowance based on a discounted cash flow analysis and comparable cost and sales methodologies, if appropriate. Individual loans that are not considered impaired and smaller-balance homogeneous loans are evaluated collectively and a general allowance is established if it is considered probable that a loss has been incurred.

The accrual of interest on loans receivable is discontinued if the loan is 90 days past due based on the contractual terms of the loan unless the loan is adequately secured and in process of collection. In general, loans are placed on non-accrual status or charged off at an earlier date if collection of principal or interest is considered doubtful. Interest on these loans is accounted for on a cash basis until qualifying for return to accrual status. Loans are returned to accrual status when all principal and interest amounts contractually due are brought current and future payments are reasonably assured.

Fair value is defined as “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.” Fair value of investments is determined based on a fair value hierarchy that prioritizes the use of observable inputs over the use of unobservable inputs and requires the use of observable inputs when available. (See Note 12 of the Notes to Consolidated Financial Statements.)

Realized gains or losses represent the difference between the cost of securities sold and the proceeds realized upon sale and are recorded at the trade date. The Company uses primarily the first-in, first-out method to determine the cost of securities sold.

The cost of securities is adjusted where appropriate to include a provision for a decline in value which is considered to be other than temporary. An other-than-temporary decline is considered to occur in investments where there has been a sustained reduction in fair value and where the Company does not expect to recover the cost basis of the investment prior to the time of sale or maturity.

For fixed maturity securities that the Company intends to sell or, more likely than not, would be required to sell, a decline in value below amortized cost is considered to be an other-than-temporary impairment (“OTTI”). The amount of OTTI is equal to the difference between amortized cost and fair value at the balance sheet date. For fixed maturity securities that the Company does not intend to sell or believes that it is more likely than not it would not be required to sell, a decline in value below amortized cost is considered to be an OTTI if the Company does not expect to recover the entire amortized cost basis of a security (i.e., the present value of cash flows expected to be collected is less than the amortized cost basis of the security). The portion of the decline in value considered to be a credit loss (i.e., the difference between the present value of cash flows expected to be collected and the amortized cost basis of the security) is recognized in earnings. The portion of the decline in value not considered to be a credit loss (i.e., the difference in the present value of cash flows expected to be collected and the fair value of the security) is recognized in other comprehensive income.

Impairment assessments for structured securities, including mortgage-backed securities and asset-backed securities, collateralized debt obligations and corporate debt, are generally evaluated based on the performance of the underlying collateral under various economic and default scenarios that may involve subjective judgments and estimates by management. Modeling these securities involves various factors, such as projected default rates, the nature and realizable value of the collateral, if any, the ability of the issuer to make scheduled payments, historical performance and other relevant economic and performance factors. If an OTTI determination is made, a discounted cash flow analysis is used to ascertain the amount of the credit impairment.

Real estate held for investment purposes is initially recorded at the purchase price, which is generally fair value, and is subsequently reported at cost less accumulated depreciation. Real estate taxes, interest and other costs incurred during development and construction are capitalized. Buildings are depreciated on a straight-line basis over the estimated useful lives of the building. Minimum rental income is recognized on a straight-line basis over the lease term. Income and expenses from real estate are reported as net investment income. The carrying value of real estate is reviewed for impairment and an impairment loss is recognized if the estimated undiscounted cash flows from the use and disposition of the property are less than the carrying value of the property.

Per share data

Per share data The Company presents both basic and diluted net income per share (“EPS”) amounts. Basic EPS is calculated by dividing net income by weighted average number of common shares outstanding during the year (including 4,926,521 common shares held in a grantor trust). The common shares held in the grantor trust are for delivery upon settlement of vested but mandatorily deferred restricted stock units ("RSUs"). Shares held by the grantor trust do not affect diluted shares outstanding since the shares deliverable under vested RSUs were already included in diluted shares outstanding. Diluted EPS is based upon the weighted average number of basic and common equivalent shares outstanding during the year and is calculated using the treasury stock method for stock incentive plans. Common equivalent shares are excluded from the computation in periods in which they have an anti-dilutive effect.

Deferred policy acquisition costs

Deferred policy acquisition costs

Acquisition costs associated with the successful acquisition of new and renewed insurance and reinsurance contracts are deferred and amortized ratably over the terms of the related contracts. Ceding commissions received on reinsurance contracts are netted against acquisition costs and are recognized ratably over the life of the contract. Deferred policy acquisition costs are presented net of unearned ceding commissions. Deferred policy acquisition costs are comprised primarily of commissions, as well as employment-related underwriting costs and premium taxes. Deferred policy acquisition costs are reviewed to determine if they are recoverable from future income and, if not, are charged to expense. The recoverability of deferred policy acquisition costs is evaluated separately by each of our operating companies. Future investment income is taken into account in measuring the recoverability of deferred policy acquisition costs.

Reserves for losses and loss expenses

Reserves for losses and loss expenses Reserves for losses and loss expenses are an accumulation of amounts determined on the basis of (1) evaluation of claims for business written directly by the Company; (2) estimates received from other companies for reinsurance assumed by the Company; and (3) estimates for losses incurred but not reported (based on Company and industry experience). These estimates are periodically reviewed and, as experience develops and new information becomes known, the reserves are adjusted as necessary. Such adjustments are reflected in the statements of income in the period in which they are determined. The Company discounts its reserves for excess and assumed workers' compensation claims using a risk-free or statutory rate. (See Note 13 of Notes to Consolidated Financial Statements.)

Reinsurance ceded

Reinsurance ceded The unearned portion of premiums ceded to reinsurers is reported as prepaid reinsurance premiums and earned ratably over the policy term. The estimated amounts of reinsurance recoverable on unpaid losses are reported as due from reinsurers. To the extent any reinsurer does not meet its obligations under reinsurance agreements, the Company must discharge its liability. Amounts due from reinsurers are reflected net of funds held where the right of offset is present. The Company has provided reserves for estimated uncollectible reinsurance.

Deposit accounting

Deposit accounting Contracts that do not meet the risk transfer requirements of GAAP are accounted for using the deposit accounting method. Under this method, an asset or liability is recognized at the inception of the contract based on consideration paid or received. The amount of the deposit asset or liability is adjusted at subsequent reporting dates using the interest method with a corresponding credit or charge to interest income or expense.

Federal and foreign income taxes

Federal and foreign income taxes

The Company files a consolidated income tax return in the U.S. and foreign tax returns in countries where it has overseas operations. The Company's method of accounting for income taxes is the asset and liability method. Under this method, deferred tax assets and liabilities are measured using tax rates currently in effect or expected to apply in the years in which those temporary differences are expected to reverse. Interest and penalties, if any, are reported as income tax expense. The Company believes there are no tax positions that would require disclosure under GAAP. Deferred tax assets are reduced by a valuation allowance if it is more likely than not that all or a portion of the deferred tax assets will not be realized.

Foreign currency

Foreign currency

Gains and losses resulting from foreign currency transactions (transactions denominated in a currency other than the entity's functional currency) are reported on the statements of income as other operating costs and expenses. Unrealized gains or losses resulting from translating the results of non-U.S. dollar denominated operations are reported in accumulated other comprehensive income. Revenues and expenses denominated in currencies other than U.S. dollars are generally translated at the weighted average exchange rate during the year. Assets and liabilities are translated at the rate of exchange in effect at the balance sheet date.

Property, furniture and equipment

Property, furniture and equipment Property, furniture and equipment are carried at cost less accumulated depreciation. Depreciation is calculated using the estimated useful lives of the respective assets.

Comprehensive income

Comprehensive income

Comprehensive income encompasses all changes in stockholders' equity (except those arising from transactions with stockholders) and includes net income, net unrealized holding gains or losses on available for sale securities and unrealized foreign currency translation adjustments.

Goodwill and other intangible assets

Goodwill and other intangible assets Goodwill and other intangible assets are tested for impairment on an annual basis and at interim periods where circumstances require.

Stock options

Restricted stock units The costs resulting from all share-based payment transactions with employees are recognized in the consolidated financial statements using a fair-value-based measurement method. Compensation cost is recognized for financial reporting purposes over the period in which the employee is required to provide service in exchange for the award (generally the vesting period).

Recent accounting pronouncements

Recent accounting pronouncements

Recently adopted accounting pronouncements:

In May 2014, the Financial Accounting Standards Board ("FASB") issued ASU 2014-09, Revenue from Customers. ASU 2014-09 clarifies the principles for recognizing revenue. While insurance contracts are not within the scope of this updated guidance, the Company’s insurance service fee revenue and non-insurance business revenue are subject to this updated guidance. The updated guidance requires an entity to recognize revenue as performance obligations are met, in order to reflect the transfer of promised goods or services to customers in an amount that reflects the consideration the entity is entitled to receive for those goods or services. The updated guidance, as amended by ASU 2015-14, was effective for public business entities for annual and interim reporting periods beginning after December 15, 2017. The Company adopted this guidance on January 1, 2018 on a prospective basis. The impact of applying this guidance prospectively was a cumulative effect adjustment that increased retained earnings, a component of stockholders' equity, by $1 million after-tax.

In January 2016, the FASB issued ASU 2016-01, Financial Instruments.  ASU 2016-01 amends the accounting guidance for financial instruments to require all equity investments with readily determinable fair values to be measured at fair value with changes in the fair value recognized in net income (other than those accounted for under equity method of accounting or those that result in consolidation of the investee).  The updated guidance was effective for public business entities for annual reporting periods beginning after December 15, 2017 and interim periods within those years. The Company adopted this updated guidance on January 1, 2018 on a prospective basis. The impact of applying this guidance prospectively was a cumulative effect adjustment that increased retained earnings and decreased accumulated other comprehensive income ("AOCI") by offsetting amounts of $291 million, resulting in no net impact to total stockholders' equity. Following the adoption, the Company reports changes in fair value related to equity securities within net realized and unrealized gains on investments.

In February 2018, the FASB issued ASU 2018-02, Reporting Comprehensive Income, which amends previous guidance to allow a reclassification to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act of 2017 (the “Tax Act”). The amount of the reclassification includes the effect of the change in the U.S. federal corporate income tax rate on the gross deferred tax amounts and related valuation allowances, if any, at the date of the enactment of the Tax Act related to items in AOCI. The updated guidance was effective for reporting periods beginning after December 15, 2018, and was eligible for early adoption. The Company adopted this updated guidance on January 1, 2018. The impact of applying this guidance was a cumulative effect adjustment that decreased retained earnings and increased AOCI by offsetting amounts of $76 million, resulting in no net impact to total stockholders' equity.

All other accounting and reporting standards that became effective in 2018 were either not applicable to the Company or their adoption did not have a material impact on the Company. 

Accounting and reporting standards that are not yet effective:

In February 2016, the FASB issued ASU 2016-02, Leases, which amends the accounting and disclosure guidance for leases.  This guidance retains the two classifications of a lease, as either an operating or finance lease, both of which will require lessees to recognize a right-of-use asset and a lease liability for leases with terms of more than 12 months. The right-of-use asset and the lease liability will be determined based upon the present value of cash flows. Finance leases will reflect the financial arrangement by recognizing interest expense on the lease liability separately from the amortization expense of the right-of-use asset. Operating leases will recognize lease expense (with no separate recognition of interest expense) on a straight-line basis over the term of the lease. The accounting by lessors is not significantly changed by the updated guidance.  The updated guidance is effective for reporting periods beginning after December 15, 2018, and can be adopted prospectively or requires that the earliest comparative period presented include the measurement and recognition of existing leases with an adjustment to equity as if the updated guidance had always been applied. The Company will adopt the new guidance prospectively as of January 1, 2019. The Company does not expect the adoption of this guidance will have a material impact on its results of operations, financial position and liquidity. The adoption of this guidance will result in the recognition of an offsetting right-of-use asset and lease liability which will be less than 1% of total assets and approximately 1% of total liabilities.

In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses, which amends the accounting guidance for credit losses on financial instruments. The updated guidance amends the current other-than-temporary impairment model for available-for-sale debt securities by requiring the recognition of impairments relating to credit losses through an allowance account and limits the amount of credit loss to the difference between a security’s amortized cost basis and its fair value. This guidance also applies a new current expected credit loss model for determining credit-related impairments for financial instruments measured at amortized cost. The updated guidance is effective for reporting periods beginning after December 15, 2019. The Company will not be able to determine the impact the adoption of this guidance will have on its results of operations, financial position or liquidity until the year the guidance becomes effective.

All other recently issued but not yet effective accounting and reporting standards are either not applicable to the Company or are not expected to have a material impact on the Company.

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Consolidated Statement of Comprehensive (Loss) Income (Tables)

12 Months Ended

Dec. 31, 2018

Equity [Abstract]

Schedule of Accumulated Other Comprehensive (Loss) Income

The following tables present the components of the changes in accumulated other comprehensive (loss) income ("AOCI") as of and for the years ended December 31, 2018 and 2017:

(In thousands)
December 31, 2018	Unrealized investment (losses) gains				Currency translation adjustments			Accumulated other comprehensive (loss) income
Changes in AOCI
Beginning of period	$	375,421			$	(306,880	)	$	68,541
Cumulative effect adjustment resulting from changes in accounting principles	(214,539		)		—			(214,539		)
Restated beginning of period	160,882				(306,880		)	(145,998		)
Other comprehensive loss before reclassifications	(246,535		)		(112,099		)	(358,634		)
Amounts reclassified from AOCI	(5,792		)		—			(5,792		)
Other comprehensive loss	(252,327		)		(112,099		)	(364,426		)
Unrealized investment loss related to non-controlling interest	(46		)		—			(46		)
Ending balance	$	(91,491	)		$	(418,979	)	$	(510,470	)
Amounts reclassified from AOCI
Pre-tax	$	(7,332	)	(1)	$	—		$	(7,332	)
Tax effect	1,540			(2)	—			1,540
After-tax amounts reclassified	$	(5,792	)		$	—		$	(5,792	)
Other comprehensive loss
Pre-tax	$	(302,737	)		$	(112,099	)	$	(414,836	)
Tax effect	50,410				—			50,410
Other comprehensive loss	$	(252,327	)		$	(112,099	)	$	(364,426	)

(In thousands)
December 31, 2017	Unrealized investment gains (losses)				Currency translation adjustments			Accumulated other comprehensive income (loss)
Changes in AOCI
Beginning of period	$	427,154			$	(371,586	)	$	55,568
Other comprehensive income before reclassifications	63,567				64,706			128,273
Amounts reclassified from AOCI	(115,319		)		—			(115,319		)
Other comprehensive (loss) income	(51,752		)		64,706			12,954
Unrealized investment gain related to non-controlling interest	19				—			19
Ending balance	$	375,421			$	(306,880	)	$	68,541
Amounts reclassified from AOCI
Pre-tax	$	(177,414	)	(1)	$	—		$	(177,414	)
Tax effect	62,095			(2)	—			62,095
After-tax amounts reclassified	$	(115,319	)		$	—		$	(115,319	)
Other comprehensive income (loss)
Pre-tax	$	(69,425	)		$	64,706		$	(4,719	)
Tax effect	17,673				—			17,673
Other comprehensive income (loss)	$	(51,752	)		$	64,706		$	12,954

_______________

(1) Net realized and unrealized gains on investments in the consolidated statements of income.

(2) Income tax expense in the consolidated statements of income.

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Investments In Fixed Maturity Securities (Tables) - Debt Securities

12 Months Ended

Dec. 31, 2018

Schedule of Marketable Securities [Line Items]

Investments In Fixed Maturity Securities

At December 31, 2018 and 2017, investments in fixed maturity securities were as follows:

(In thousands)	Amortized Cost		Gross Unrealized					Fair Value		Carrying Value
			Gains		Losses
December 31, 2018
Held to maturity:
State and municipal	$	67,891	$	11,549	$	—		$	79,440	$	67,891
Residential mortgage-backed	10,744		1,259		—			12,003		10,744
Total held to maturity	78,635		12,808		—			91,443		78,635
Available for sale:
U.S. government and government agency	697,931		9,219		(4,910		)	702,240		702,240
State and municipal:
Special revenue	2,396,089		30,507		(19,790		)	2,406,806		2,406,806
State general obligation	335,626		11,951		(1,103		)	346,474		346,474
Pre-refunded	408,141		16,568		(30		)	424,679		424,679
Corporate backed	272,440		4,319		(2,350		)	274,409		274,409
Local general obligation	403,219		18,350		(1,339		)	420,230		420,230
Total state and municipal	3,815,515		81,695		(24,612		)	3,872,598		3,872,598
Mortgage-backed securities:
Residential (1)	1,264,376		7,729		(20,225		)	1,251,880		1,251,880
Commercial	345,070		1,304		(3,708		)	342,666		342,666
Total mortgage-backed securities	1,609,446		9,033		(23,933		)	1,594,546		1,594,546
Asset-backed securities	2,462,303		10,131		(33,687		)	2,438,747		2,438,747
Corporate:
Industrial	2,295,778		15,355		(53,312		)	2,257,821		2,257,821
Financial	1,502,427		7,178		(45,683		)	1,463,922		1,463,922
Utilities	330,326		2,997		(4,148		)	329,175		329,175
Other	60,238		322		(167		)	60,393		60,393
Total corporate	4,188,769		25,852		(103,310		)	4,111,311		4,111,311
Foreign government	822,093		11,753		(25,111		)	808,735		808,735
Total available for sale	13,596,057		147,683		(215,563		)	13,528,177		13,528,177
Total investments in fixed maturity securities	$	13,674,692	$	160,491	$	(215,563	)	$	13,619,620	$	13,606,812

(In thousands)	Amortized Cost		Gross Unrealized					Fair Value		Carrying Value
			Gains		Losses
December 31, 2017
Held to maturity:
State and municipal	$	65,882	$	14,499	$	—		$	80,381	$	65,882
Residential mortgage-backed	13,450		1,227		—			14,677		13,450
Total held to maturity	79,332		15,726		—			95,058		79,332
Available for sale:
U.S. government and government agency	372,748		8,824		(3,832		)	377,740		377,740
State and municipal:
Special revenue	2,663,245		53,512		(10,027		)	2,706,730		2,706,730
State general obligation	439,358		16,087		(711		)	454,734		454,734
Pre-refunded	436,241		22,701		(9		)	458,933		458,933
Corporate backed	375,268		10,059		(860		)	384,467		384,467
Local general obligation	417,955		23,242		(967		)	440,230		440,230
Total state and municipal	4,332,067		125,601		(12,574		)	4,445,094		4,445,094
Mortgage-backed securities:
Residential (1)	1,043,629		9,304		(13,547		)	1,039,386		1,039,386
Commercial	261,652		1,521		(2,628		)	260,545		260,545
Total mortgage-backed securities	1,305,281		10,825		(16,175		)	1,299,931		1,299,931
Asset-backed securities	2,111,132		11,024		(10,612		)	2,111,544		2,111,544
Corporate:
Industrial	2,574,400		52,210		(7,718		)	2,618,892		2,618,892
Financial	1,402,161		37,744		(5,138		)	1,434,767		1,434,767
Utilities	284,886		11,316		(1,248		)	294,954		294,954
Other	40,560		5		(66		)	40,499		40,499
Total corporate	4,302,007		101,275		(14,170		)	4,389,112		4,389,112
Foreign government	819,345		32,018		(2,866		)	848,497		848,497
Total available for sale	13,242,580		289,567		(60,229		)	13,471,918		13,471,918
Total investments in fixed maturity securities	$	13,321,912	$	305,293	$	(60,229	)	$	13,566,976	$	13,551,250

____________________

(1) Gross unrealized (losses) gains for mortgage-backed securities include ($55,090) and $76,467 as of December 31, 2018 and 2017, respectively, related to the non-credit portion of OTTI recognized in other comprehensive income.

The Amortized Cost And Fair Value of Fixed Maturity Securities

The amortized cost and fair value of fixed maturity securities at December 31, 2018, by contractual maturity, are shown below. Actual maturities may differ from contractual maturities because certain issuers may have the right to call or prepay obligations.

(In thousands)	Amortized Cost		Fair Value
Due in one year or less	$	935,354	$	935,894
Due after one year through five years	4,666,934		4,669,502
Due after five years through ten years	3,037,450		3,045,868
Due after ten years	3,414,764		3,361,807
Mortgage-backed securities	1,620,190		1,606,549
Total	$	13,674,692	$	13,619,620

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Investments In Equity Securities (Tables)

12 Months Ended

Dec. 31, 2018

Equity securities

Schedule of Available-for-sale Securities [Line Items]

Schedule of Investments in Equity Securities

At December 31, 2018 and 2017, investments in equity securities were as follows:

(In thousands)	Cost		Gross Unrealized (1)					Fair Value		Carrying Value
			Gains		Losses
December 31, 2018
Common stocks	$	113,576	$	4,335	$	(19,719	)	$	98,192	$	98,192
Preferred stocks	115,201		72,364		(6,751		)	180,814		180,814
Total	$	228,777	$	76,699	$	(26,470	)	$	279,006	$	279,006
December 31, 2017
Common stocks	$	81,855	$	272,309	$	(1,960	)	$	352,204	$	352,204
Preferred stocks	124,150		102,890		(2,597		)	224,443		224,443
Total	$	206,005	$	375,199	$	(4,557	)	$	576,647	$	576,647

(1) Effective January 1, 2018, the Company adopted new accounting guidance that requires all equity investments with readily determinable fair values (subject to certain exceptions) to be measured at fair value, with changes in the fair value recognized through net income within net realized and unrealized gains on investments. Refer to Note 1 for additional information.

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Net Investment Income (Tables)

12 Months Ended

Dec. 31, 2018

Net Investment Income [Abstract]

Net Investment Income

Net investment income consists of the following:

(In thousands)	2018			2017			2016
Investment income earned on:
Fixed maturity securities, including cash and cash equivalents and loans receivable	$	519,269		$	473,101		$	444,247
Investment funds	109,349			68,169			99,301
Arbitrage trading account	28,157			19,145			18,693
Real estate	18,591			19,975			7,054
Equity securities	3,230			2,350			4,028
Gross investment income	678,596			582,740			573,323
Investment expense	(4,361		)	(6,952		)	(9,160		)
Net investment income	$	674,235		$	575,788		$	564,163

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Investment Funds (Tables)

12 Months Ended

Dec. 31, 2018

Equity Method Investments and Joint Ventures [Abstract]

Schedule of Investment Funds

Investment funds consist of the following:

	Carrying Value as of December 31,				Income (Losses)
(In thousands)	2018		2017		2018		2017			2016
Real estate	$	642,137	$	606,995	$	61,453	$	45,068		$	50,415
Energy	75,213		82,882		645		(15,764		)	19,747
Other funds	615,468		465,800		47,251		38,865			29,139
Total	$	1,332,818	$	1,155,677	$	109,349	$	68,169		$	99,301

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Real Estate (Tables)

12 Months Ended

Dec. 31, 2018

Real Estate [Abstract]

Schedule of real estate properties

Investment in real estate represents directly owned property held for investment, as follows:    

	As of December 31,
(In thousands)	2018		2017
Properties in operation	$	1,279,584	$	451,691
Properties under development	677,508		1,017,910
Total	$	1,957,092	$	1,469,601

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Loans Receivable (Tables)

12 Months Ended

Dec. 31, 2018

Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]

Schedule of Loans Receivable

Loans receivable are as follows:

	As of December 31,
(In thousands)	2018		2017
Amortized cost (net of valuation allowance):
Real estate loans	$	62,289	$	66,057
Commercial loans	32,524		13,627
Total	$	94,813	$	79,684
Fair value:
Real estate loans	$	63,047	$	66,917
Commercial loans	34,026		15,130
Total	$	97,073	$	82,047
Valuation allowance:
Specific	$	1,200	$	1,200
General	2,183		2,183
Total	$	3,383	$	3,383
	For the Year Ended December 31,
	2018		2017
Increase (decrease) in valuation allowance	$	—	$	(14	)

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Realized And Unrealized Investment Gains and Losses (Tables)

12 Months Ended

Dec. 31, 2018

Realized and Unrealized Investment Gains (Losses) [Abstract]

Realized and Unrealized Investment Gains (Losses)

Net realized and unrealized gains (losses) on investments are as follows:

(In thousands)	2018			2017			2016
Net realized and unrealized gains (losses) on investments in earnings
Fixed maturity securities:
Gains	$	26,752		$	28,217		$	72,215
Losses	(13,733		)	(5,342		)	(6,434		)
Equity securities (1):
Net realized gains on investment sales	435,150			154,539			14,201
Change in unrealized gains	(320,413		)	—			—
Investment funds (2)	(212		)	125,423			58,861
Real estate	27,816			12,880			7,757
Loans receivable	2,838			—			—
Other (3)	1,977			20,141			138,519
Net realized and unrealized gains on investments in earnings before OTTI	160,175			335,858			285,119
Other-than-temporary impairments (4)	(5,687		)	—			(18,114		)
Net realized and unrealized gains on investments in earnings	154,488			335,858			267,005
Income tax expense	(32,442		)	(117,550		)	(93,452		)
After-tax net realized and unrealized gains on investments in earnings	$	122,046		$	218,308		$	173,553

Change In Unrealized Gains (Losses)

Change in unrealized investment (losses) gains of available for sales securities:
Fixed maturity securities	$	(297,084	)	$	(2,192	)	$	(107,094	)
Previously impaired fixed maturity securities	(132		)	895			451
Equity securities available for sale (5)	—			(77,971		)	465,727
Investment funds	(5,521		)	9,843			12,631
Total change in unrealized investment (losses) gains	(302,737		)	(69,425		)	371,715
Income tax benefit (expense)	50,410			17,673			(125,315		)
Noncontrolling interests	(46		)	19			59
After-tax change in unrealized investment (losses) gains of available for sale securities	$	(252,373	)	$	(51,733	)	$	246,459

____________________

(1) The net realized gains or losses on investment sales represent the total gains or losses from the purchase dates of the equity securities. The change in unrealized gains consists of two components: (i) the reversal of the gain or loss recognized in previous periods on equity securities sold and (ii) the change in unrealized gain or loss resulting from mark-to-market adjustments on equity securities still held.

(2) Investment funds includes a gain of $124 million from the sale of an investment in an office building located in Washington, D.C. for the year ended December 31, 2017.

(3) Other includes a gain of $135 million from the sale of Aero Precision Industries and certain related aviation services business for the year ended December 31, 2016.

(4) For the year ended December 31, 2018, OTTI related to fixed maturity securities was $6 million. There were no OTTI for the year ended December 31, 2017. For the year ended December 31, 2016, OTTI related to equity securities was $18 million.

(5) Effective January 1, 2018, the Company adopted new accounting guidance that requires all equity investments with readily determinable fair values (subject to certain exceptions) to be measured at fair value with changes in the fair value recognized in net income. The Company recorded an adjustment of $291 million to opening AOCI net of tax as a result of this guidance. Refer to Note 1 for further information.

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Securities In An Unrealized Loss Position (Tables)

12 Months Ended

Dec. 31, 2018

Investments, Debt and Equity Securities [Abstract]

Securities In An Unrealized Loss Position

The following tables summarize all fixed maturity securities in an unrealized loss position at December 31, 2018 and 2017 by the length of time those securities have been continuously in an unrealized loss position.

	Less Than 12 Months				12 Months or Greater				Total
(In thousands)	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
December 31, 2018
U.S. government and government agency	$	195,359	$	933	$	130,815	$	3,977	$	326,174	$	4,910
State and municipal	701,700		6,874		744,905		17,738		1,446,605		24,612
Mortgage-backed securities	334,063		2,911		712,595		21,022		1,046,658		23,933
Asset-backed securities	1,687,665		28,965		342,855		4,722		2,030,520		33,687
Corporate	1,730,513		54,181		954,763		49,129		2,685,276		103,310
Foreign government	246,273		24,197		80,004		914		326,277		25,111
Fixed maturity securities	$	4,895,573	$	118,061	$	2,965,937	$	97,502	$	7,861,510	$	215,563
December 31, 2017
U.S. government and government agency	$	92,167	$	1,491	$	72,055	$	2,341	$	164,222	$	3,832
State and municipal	735,972		5,944		345,755		6,630		1,081,727		12,574
Mortgage-backed securities	480,435		5,110		373,956		11,065		854,391		16,175
Asset-backed securities	1,127,309		8,298		167,412		2,314		1,294,721		10,612
Corporate	1,103,747		8,224		170,858		5,946		1,274,605		14,170
Foreign government	244,139		2,615		25,824		251		269,963		2,866
Fixed maturity securities	$	3,783,769	$	31,682	$	1,155,860	$	28,547	$	4,939,629	$	60,229

Non-Investment Grade Fixed Maturity Securities

A summary of the Company’s non-investment grade fixed maturity securities that were in an unrealized loss position at December 31, 2018 is presented in the table below:

($ in thousands)	Number of Securities	Aggregate Fair Value		Gross Unrealized Loss
Foreign government	13	$	140,854	$	21,411
Corporate	13	120,078		13,111
Asset-backed securities	5	14,662		2,593
Mortgage-backed securities	5	8,741		69
Total	36	$	284,335	$	37,184

XML

Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2018

Fair Value Disclosures [Abstract]

Assets And Liabilities Measured At Fair value, On A Recurring Basis

The following tables present the assets and liabilities measured at fair value as of December 31, 2018 and 2017 by level:

(In thousands)	Total		Level 1		Level 2		Level 3
December 31, 2018
Assets:
Fixed maturity securities available for sale:
U.S. government and government agency	$	702,240	$	—	$	702,240	$	—
State and municipal	3,872,598		—		3,872,598		—
Mortgage-backed securities	1,594,546		—		1,594,546		—
Asset-backed securities	2,438,747		—		2,438,648		99
Corporate	4,111,311		—		4,111,311		—
Foreign government	808,735		—		808,735		—
Total fixed maturity securities available for sale	13,528,177		—		13,528,078		99
Equity securities:
Common stocks	98,192		89,596		—		8,596
Preferred stocks	180,814		—		176,869		3,945
Total equity securities	279,006		89,596		176,869		12,541
Arbitrage trading account	452,548		353,335		81,905		17,308
Total	$	14,259,731	$	442,931	$	13,786,852	$	29,948
Liabilities:
Trading account securities sold but not yet purchased	$	38,120	$	37,327	$	—	$	793
December 31, 2017
Assets:
Fixed maturity securities available for sale:
U.S. government and government agency	$	377,740	$	—	$	377,740	$	—
State and municipal	4,445,094		—		4,445,094		—
Mortgage-backed securities	1,299,931		—		1,299,931		—
Asset-backed securities	2,111,544		—		2,111,372		172
Corporate	4,389,112		—		4,389,112		—
Foreign government	848,497		—		848,497		—
Total fixed maturity securities available for sale	13,471,918		—		13,471,746		172
Equity securities:
Common stocks	352,204		342,834		—		9,370
Preferred stocks	224,443		—		213,600		10,843
Total equity securities	576,647		342,834		213,600		20,213
Arbitrage trading account	617,649		471,420		146,229		—
Total	$	14,666,214	$	814,254	$	13,831,575	$	20,385
Liabilities:
Trading account securities sold but not yet purchased	$	64,358	$	64,358	$	—	$	—

Summarize Changes In Level 3 Assets and Liabilities

The following tables summarize changes in Level 3 assets and liabilities for the years ended December 31, 2018 and 2017:

	Gains (Losses) Included in:
(In thousands)	Beginning Balance		Earnings (Losses)			Other Comprehensive Income (Losses)		Impairments		Purchases		Sales			Paydowns/Maturities		Transfers In / Out		Ending Balance
Year ended December 31, 2018
Assets:
Fixed maturity securities available for sale:
Asset-backed securities	$	172	$	(2	)	$	46	$	—	$	—	$	(117	)	$	—	$	—	$	99
Total	172		(2		)	46		—		—		(117		)	—		—		99
Equity securities:
Common stocks	9,370		(548		)			—		—		(227		)	—		1		8,596
Preferred stocks	10,843		100			—		—				(6,998		)	—		—		3,945
Total	20,213		(448		)	—		—		—		(7,225		)	—		1		12,541
Arbitrage trading account	—		(6		)	—		—		11,523		(11		)	—		5,802		17,308
Total	$	20,385	$	(456	)	$	46	$	—	$	11,523	$	(7,353	)	$	—	$	5,803	$	29,948
Year ended December 31, 2017
Assets:
Fixed maturity securities available for sale:
Asset-backed securities	$	183	$	3		$	34	$	—	$	—	$	(48	)	$	—	$	—	$	172
Total	183		3			34		—		—		(48		)	—		—		172
Equity securities:
Common stocks	8,754		—			616		—		—		—			—		—		9,370
Preferred stocks	3,662		8			—		—		7,173		—			—		—		10,843
Total	12,416		8			616		—		7,173		—			—		—		20,213
Arbitrage trading account	—		8			—		—		—		(8		)	—		—		—
Total	$	12,599	$	19		$	650	$	—	$	7,173	$	(56	)	$	—	$	—	$	20,385

XML

Reserves For Losses And Loss Expenses (Tables)

12 Months Ended

Dec. 31, 2018

Insurance [Abstract]

Loss and loss expenses incurred, net of reinsurance, and cumulative paid claims and claim adjustment expenses, net of reinsurance

The following tables present undiscounted incurred and paid claims development as of December 31, 2018, net of reinsurance, as well as cumulative claim frequency and the total of incurred but not reported liabilities (IBNR). The information about incurred and paid claims development for the years ended December 31, 2009 to 2017 is presented as supplementary information. To enhance the comparability of the loss development data, the Company has removed the impact of foreign exchange rate movements by using the December 31, 2018 exchange rate for all periods. Beginning with accident year 2012, the Company's U.K. and European insurance business is included in the Insurance segment's tables for Other Liability, Professional Liability, Commercial Automobile and Short-Tail Lines. Prior to 2012, the actuarial analysis for its U.K. and European insurance business was performed on an underwriting year basis and accident year data is not available for those years.

Insurance

Other Liability

(In thousands)

Loss and Loss Expenses Incurred, Net of Reinsurance																					As of December 31, 2018
For the Year Ended December 31,
	Unaudited
Accident Year	2009		2010		2011		2012		2013		2014		2015		2016		2017		2018		IBNR		Cumulative Number of Reported Claims
2009	$	689,634	$	656,788	$	624,991	$	599,235	$	589,659	$	561,784	$	557,661	$	553,058	$	546,746	$	542,568	$	18,690	23
2010	—		612,210		615,797		592,117		590,818		577,679		574,780		573,532		571,305		566,695		26,658		23
2011	—		—		665,035		673,730		660,023		659,026		653,864		649,055		645,123		634,264		30,381		24
2012	—		—		—		693,447		702,342		703,118		709,026		713,266		723,610		718,166		47,001		24
2013	—		—		—		—		751,544		792,464		784,906		784,342		805,288		811,592		78,784		26
2014	—		—		—		—		—		847,207		848,947		847,008		851,503		864,157		128,856		26
2015	—		—		—		—		—		—		951,041		986,792		961,289		964,415		217,570		26
2016	—		—		—		—		—		—		—		1,018,454		1,011,368		1,019,749		375,609		25
2017	—		—		—		—		—		—		—		—		1,067,376		1,100,243		567,982		23
2018	—		—		—		—		—		—		—		—		—		1,104,518		837,548		18
Total																			$	8,326,367

Cumulative Paid Claims and Claim Adjustment Expenses, Net of Reinsurance
For the Year Ended December 31,
	Unaudited
Accident Year	2009		2010		2011		2012		2013		2014		2015		2016		2017		2018
2009	$	44,801	$	122,850	$	214,498	$	311,979	$	385,068	$	429,128	$	470,830	$	486,893	$	500,953	$	510,474
2010	—		45,193		128,946		248,698		336,243		417,166		461,442		491,104		508,359		525,016
2011	—		—		48,825		142,713		266,780		379,845		470,849		524,314		556,110		575,194
2012	—		—		—		58,108		158,869		299,842		417,686		513,644		580,750		622,687
2013	—		—		—		—		63,868		189,936		332,871		473,933		589,564		650,428
2014	—		—		—		—		—		79,078		191,394		338,961		481,039		595,024
2015	—		—		—		—		—		—		82,829		210,940		382,498		538,502
2016	—		—		—		—		—		—		—		69,620		209,212		390,552
2017	—		—		—		—		—		—		—		—		80,174		256,448
2018	—		—		—		—		—		—		—		—		—		87,075
Total																			$	4,751,400
	Reserves for loss and loss adjustment expenses before 2009, net of reinsurance																		121,405
	Reserves for loss and loss adjustment expenses, net of reinsurance																		$	3,696,372

Primary Workers' Compensation

(In thousands)

Loss and Loss Expenses Incurred, Net of Reinsurance																					As of December 31, 2018
For the Year Ended December 31,
	Unaudited
Accident Year	2009		2010		2011		2012		2013		2014		2015		2016		2017		2018		IBNR		Cumulative Number of Reported Claims
2009	$	327,537	$	332,303	$	326,766	$	386,870	$	392,158	$	394,303	$	392,287	$	395,288	$	398,994	$	401,431	$	10,693	43
2010	—		358,734		361,808		409,237		418,315		426,622		429,952		429,762		427,698		424,374		13,958		45
2011	—		—		419,364		442,550		454,797		470,026		472,087		474,076		475,729		471,471		17,942		46
2012	—		—		—		499,752		499,882		503,956		503,863		509,167		512,707		508,169		26,626		48
2013	—		—		—		—		551,342		547,295		546,995		543,238		547,000		542,274		35,177		53
2014	—		—		—		—		—		639,436		637,307		627,767		617,242		615,435		57,455		57
2015	—		—		—		—		—		—		712,800		690,525		650,997		641,169		83,941		58
2016	—		—		—		—		—		—		—		702,716		696,339		684,700		117,425		57
2017	—		—		—		—		—		—		—		—		762,093		733,505		191,034		57
2018	—		—		—		—		—		—		—		—		—		778,964		359,337		53
Total																			$	5,801,492

Cumulative Paid Claims and Claim Adjustment Expenses, Net of Reinsurance
For the Year Ended December 31,
	Unaudited
Accident Year	2009		2010		2011		2012		2013		2014		2015		2016		2017		2018
2009	$	93,647	$	197,736	$	257,972	$	297,079	$	317,796	$	333,793	$	344,771	$	352,516	$	360,289	$	364,712
2010	—		107,742		214,034		279,226		317,986		344,631		362,078		374,013		382,665		388,405
2011	—		—		106,157		234,694		307,873		355,909		385,759		408,304		420,945		428,811
2012	—		—		—		114,998		253,781		339,560		387,368		419,588		437,196		451,991
2013	—		—		—		—		117,502		277,538		363,028		414,160		447,894		466,580
2014	—		—		—		—		—		148,405		319,743		412,611		471,235		503,915
2015	—		—		—		—		—		—		139,320		323,744		421,734		477,541
2016	—		—		—		—		—		—		—		142,998		338,835		446,072
2017	—		—		—		—		—		—		—		—		153,456		362,299
2018	—		—		—		—		—		—		—		—		—		171,006
Total																			$	4,061,332
			Reserves for loss and loss adjustment expenses before 2009, net of reinsurance																170,897
			Reserves for loss and loss adjustment expenses, net of reinsurance																$	1,911,057

Excess Workers' Compensation

(In thousands)

Loss and Loss Expenses Incurred, Net of Reinsurance																					As of December 31, 2018
For the Year Ended December 31,
	Unaudited
Accident Year	2009		2010		2011		2012		2013		2014		2015		2016		2017		2018		IBNR		Cumulative Number of Reported Claims
2009	$	168,762	$	153,766	$	153,912	$	148,223	$	148,189	$	138,765	$	142,768	$	134,716	$	129,249	$	130,790	$	21,734	1
2010	—		135,639		123,497		120,272		118,712		100,331		104,732		100,065		94,986		95,374		14,497		1
2011	—		—		88,650		93,993		98,051		87,064		85,299		83,850		78,246		74,109		17,280		1
2012	—		—		—		72,366		73,230		71,780		73,653		72,441		67,878		69,361		16,293		1
2013	—		—		—		—		63,995		48,493		46,025		42,419		38,551		35,120		16,473		1
2014	—		—		—		—		—		63,465		57,558		49,478		45,758		41,671		18,448		1
2015	—		—		—		—		—		—		69,977		57,897		50,099		45,115		25,425		—
2016	—		—		—		—		—		—		—		72,657		70,281		71,404		37,500		—
2017	—		—		—		—		—		—		—		—		76,701		80,508		42,652		1
2018	—		—		—		—		—		—		—		—		—		77,820		46,840		1
Total																			$	721,272

Cumulative Paid Claims and Claim Adjustment Expenses, Net of Reinsurance
For the Year Ended December 31,
	Unaudited
Accident Year	2009		2010		2011		2012		2013		2014		2015		2016		2017		2018
2009	$	5,060	$	8,402	$	11,037	$	14,138	$	20,729	$	25,272	$	29,150	$	33,573	$	37,817	$	41,243
2010	—		2,867		4,003		5,571		8,701		9,084		11,699		14,261		18,821		22,355
2011	—		—		2,593		4,848		6,395		12,104		15,684		18,638		20,164		21,463
2012	—		—		—		1,127		6,097		9,480		11,167		13,234		15,738		17,982
2013	—		—		—		—		647		630		2,158		3,008		3,396		4,418
2014	—		—		—		—		—		358		1,729		3,354		4,175		5,808
2015	—		—		—		—		—		—		2,069		2,481		3,272		4,099
2016	—		—		—		—		—		—		—		2,498		4,783		5,573
2017	—		—		—		—		—		—		—		—		6,282		12,810
2018	—		—		—		—		—		—		—		—		—		6,141
Total																			$	141,892
	Reserves for loss and loss adjustment expenses before 2009, net of reinsurance																		740,877
	Reserves for loss and loss adjustment expenses, net of reinsurance																		$	1,320,257

Professional Liability

(In thousands)

Loss and Loss Expenses Incurred, Net of Reinsurance																					As of December 31, 2018
For the Year Ended December 31,
	Unaudited
Accident Year	2009		2010		2011		2012		2013		2014		2015		2016		2017		2018		IBNR		Cumulative Number of Reported Claims
2009	$	134,784	$	139,091	$	145,515	$	148,899	$	147,994	$	150,452	$	150,783	$	153,492	$	152,711	$	157,451	$	1,087	3
2010	—		147,649		165,755		179,383		177,957		176,723		172,585		174,883		177,844		182,818		1,807		4
2011	—		—		179,875		165,233		186,918		190,096		177,128		173,545		176,865		175,963		3,185		4
2012	—		—		—		238,233		241,944		264,808		250,457		238,704		245,076		243,893		9,507		7
2013	—		—		—		—		269,280		247,320		242,792		248,974		270,449		279,092		15,395		7
2014	—		—		—		—		—		253,284		246,668		259,964		243,936		239,555		19,315		8
2015	—		—		—		—		—		—		259,569		258,251		274,950		276,406		47,934		9
2016	—		—		—		—		—		—		—		310,678		324,979		361,929		90,872		10
2017	—		—		—		—		—		—		—		—		333,803		333,194		178,091		9
2018	—		—		—		—		—		—		—		—		—		335,751		260,095		9
Total																			$	2,586,052

Cumulative Paid Claims and Claim Adjustment Expenses, Net of Reinsurance
For the Year Ended December 31,
	Unaudited
Accident Year	2009		2010		2011		2012		2013		2014		2015		2016		2017		2018
2009	$	12,604	$	52,583	$	85,902	$	117,683	$	127,728	$	138,876	$	143,950	$	144,713	$	147,599	$	151,499
2010	—		14,832		58,916		108,566		129,757		144,474		160,598		165,018		171,330		178,879
2011	—		—		18,779		62,442		103,097		134,608		150,840		159,014		167,286		168,874
2012	—		—		—		21,875		87,008		128,281		159,183		190,295		214,315		223,424
2013	—		—		—		—		24,232		64,030		119,552		177,343		206,655		248,520
2014	—		—		—		—		—		19,545		83,856		138,753		176,181		199,245
2015	—		—		—		—		—		—		20,478		85,561		139,952		187,767
2016	—		—		—		—		—		—		—		28,702		102,853		202,131
2017	—		—		—		—		—		—		—		—		36,733		96,814
2018	—		—		—		—		—		—		—		—		—		28,307
Total																			$	1,685,460
	Reserves for loss and loss adjustment expenses before 2009, net of reinsurance																		4,198
	Reserves for loss and loss adjustment expenses, net of reinsurance																		$	904,790

Commercial Automobile

(In thousands)

Loss and Loss Expenses Incurred, Net of Reinsurance																					As of December 31, 2018
For the Year Ended December 31,
	Unaudited
Accident Year	2009		2010		2011		2012		2013		2014		2015		2016		2017		2018		IBNR		Cumulative Number of Reported Claims
2009	$	362,302	$	345,139	$	340,967	$	335,851	$	337,915	$	336,855	$	334,652	$	335,089	$	334,977	$	334,926	$	398	39
2010	—		310,591		320,098		330,190		328,854		332,716		331,581		330,552		330,263		329,942		372		37
2011	—		—		312,224		320,898		328,269		331,694		341,362		341,162		342,052		343,524		1,232		37
2012	—		—		—		314,073		326,585		342,379		355,433		364,175		364,437		366,662		1,539		40
2013	—		—		—		—		326,789		348,513		368,318		376,569		366,976		366,565		3,013		42
2014	—		—		—		—		—		363,308		384,692		418,215		416,194		413,697		6,431		45
2015	—		—		—		—		—		—		389,101		417,403		423,601		431,857		18,247		50
2016	—		—		—		—		—		—		—		431,633		431,680		443,030		35,867		49
2017	—		—		—		—		—		—		—		—		430,352		428,601		70,289		44
2018	—		—		—		—		—		—		—		—		—		442,862		145,744		39
Total																			$	3,901,666

Cumulative Paid Claims and Claim Adjustment Expenses, Net of Reinsurance
For the Year Ended December 31,
	Unaudited
Accident Year	2009		2010		2011		2012		2013		2014		2015		2016		2017		2018
2009	$	136,433	$	209,553	$	257,326	$	291,925	$	312,902	$	328,843	$	331,482	$	333,143	$	333,605	$	333,677
2010	—		136,029		208,790		263,639		295,347		313,253		324,963		326,770		327,206		327,829
2011	—		—		135,350		211,756		262,659		296,332		321,786		333,949		338,283		340,319
2012	—		—		—		136,844		215,078		273,277		312,178		344,428		355,740		360,799
2013	—		—		—		—		142,480		218,005		266,694		322,141		343,274		353,159
2014	—		—		—		—		—		155,065		237,118		328,156		365,424		394,147
2015	—		—		—		—		—		—		159,679		265,396		325,369		370,450
2016	—		—		—		—		—		—		—		185,045		280,146		342,214
2017	—		—		—		—		—		—		—		—		180,627		267,469
2018	—		—		—		—		—		—		—		—		—		180,213
Total																			$	3,270,276
			Reserves for loss and loss adjustment expenses before 2009, net of reinsurance																2,482
			Reserves for loss and loss adjustment expenses, net of reinsurance																$	633,872

Short-tail lines

(In thousands)

Loss and Loss Expenses Incurred, Net of Reinsurance																					As of December 31, 2018
For the Year Ended December 31,
	Unaudited
Accident Year	2009		2010		2011		2012		2013		2014		2015		2016		2017		2018		IBNR		Cumulative Number of Reported Claims
2009	$	346,870	$	335,921	$	326,440	$	318,111	$	318,349	$	314,290	$	314,117	$	314,010	$	316,220	$	317,098	$	550	18
2010	—		385,541		370,291		358,373		355,916		346,226		346,719		346,885		346,463		346,172		833		19
2011	—		—		478,556		471,555		463,006		459,814		457,011		450,115		449,320		451,211		1,093		21
2012	—		—		—		526,312		535,500		535,885		531,729		507,646		506,705		508,565		3,083		25
2013	—		—		—		—		572,103		583,603		575,582		553,621		552,137		548,730		5,740		26
2014	—		—		—		—		—		701,335		709,832		664,303		663,282		664,350		6,562		30
2015	—		—		—		—		—		—		743,872		731,468		727,677		726,606		15,079		32
2016	—		—		—		—		—		—		—		771,416		774,514		761,891		20,857		34
2017	—		—		—		—		—		—		—		—		750,786		752,193		34,275		38
2018	—		—		—		—		—		—		—		—		—		759,340		161,107		36
Total																			$	5,836,156

Cumulative Paid Claims and Claim Adjustment Expenses, Net of Reinsurance
For the Year Ended December 31,
	Unaudited
Accident Year	2009		2010		2011		2012		2013		2014		2015		2016		2017		2018
2009	$	212,521	$	291,338	$	304,634	$	306,020	$	309,916	$	310,428	$	311,079	$	311,357	$	311,655	$	315,966
2010	—		245,036		325,156		337,686		346,768		340,210		342,918		344,102		345,085		345,106
2011	—		—		303,012		417,701		436,585		440,777		445,073		446,745		447,342		450,155
2012	—		—		—		281,456		453,157		503,364		513,733		498,506		499,446		503,738
2013	—		—		—		—		312,945		486,692		534,939		531,386		538,158		539,443
2014	—		—		—		—		—		371,194		596,829		613,621		633,020		648,373
2015	—		—		—		—		—		—		396,086		612,335		667,846		689,875
2016	—		—		—		—		—		—		—		416,144		669,029		710,618
2017	—		—		—		—		—		—		—		—		444,407		688,821
2018	—		—		—		—		—		—		—		—		—		415,206
Total																			$	5,307,301
	Reserves for loss and loss adjustment expenses before 2009, net of reinsurance																		2,362
	Reserves for loss and loss adjustment expenses, net of reinsurance																		$	531,217

Reinsurance

Casualty

(In thousands)

Loss and Loss Expenses Incurred, Net of Reinsurance																					As of December 31, 2018
For the Year Ended December 31,
	Unaudited
Accident Year	2009		2010		2011		2012		2013		2014		2015		2016		2017		2018		IBNR
2009	$	334,804	$	328,321	$	327,236	$	309,228	$	301,495	$	293,275	$	282,411	$	288,115	$	281,592	$	279,372	$	17,086
2010	—		290,285		298,300		288,141		276,234		265,771		254,550		251,308		249,062		248,145		18,428
2011	—		—		290,635		309,621		304,409		299,628		306,911		303,867		295,576		292,162		21,264
2012	—		—		—		331,603		335,661		331,006		324,014		332,932		335,636		333,889		25,536
2013	—		—		—		—		319,159		270,221		273,528		283,580		292,447		298,061		33,269
2014	—		—		—		—		—		320,250		320,176		319,855		331,836		326,251		49,301
2015	—		—		—		—		—		—		259,609		232,203		231,020		253,264		30,511
2016	—		—		—		—		—		—		—		241,282		253,450		246,235		62,140
2017	—		—		—		—		—		—		—		—		231,826		221,820		122,752
2018	—		—		—		—		—		—		—		—		—		221,945		184,317
Total																			$	2,721,144

Cumulative Paid Claims and Claim Adjustment Expenses, Net of Reinsurance
For the Year Ended December 31,
	Unaudited
Accident Year	2009		2010		2011		2012		2013		2014		2015		2016		2017		2018
2009	$	21,332	$	53,636	$	85,761	$	124,030	$	155,124	$	181,946	$	196,775	$	211,143	$	221,141	$	228,990
2010	—		17,964		45,626		77,191		106,381		129,041		149,322		165,027		180,544		190,295
2011	—		—		17,876		52,365		97,702		134,285		168,244		191,864		207,692		220,011
2012	—		—		—		22,390		62,198		111,928		151,635		186,483		219,106		240,926
2013	—		—		—		—		28,920		63,849		109,202		143,268		177,101		204,820
2014	—		—		—		—		—		21,306		69,134		116,266		155,764		198,993
2015	—		—		—		—		—		—		17,865		48,593		91,548		141,834
2016	—		—		—		—		—		—		—		19,923		61,930		100,587
2017	—		—		—		—		—		—		—		—		16,493		40,338
2018	—		—		—		—		—		—		—		—		—		11,152
Total																			$	1,577,946
	Reserves for loss and loss adjustment expenses before 2009, net of reinsurance																		369,801
			Reserves for loss and loss adjustment expenses, net of reinsurance																$	1,512,999

Property

(In thousands)

Loss and Loss Expenses Incurred, Net of Reinsurance																					As of December 31, 2018
For the Year Ended December 31,
	Unaudited
Accident Year	2009		2010		2011		2012		2013		2014		2015		2016		2017		2018		IBNR
2009	$	48,029	$	43,193	$	42,352	$	38,711	$	38,124	$	37,505	$	36,913	$	36,263	$	35,293	$	35,763	$	—
2010	—		58,576		55,647		52,561		51,448		51,500		50,971		50,871		50,699		50,932		201
2011	—		—		95,217		87,970		85,118		86,544		85,006		84,739		84,471		84,882		314
2012	—		—		—		103,744		94,720		86,426		85,451		83,925		83,938		84,875		626
2013	—		—		—		—		141,298		112,590		114,063		111,915		112,555		111,876		1,192
2014	—		—		—		—		—		112,987		96,668		97,363		100,148		99,410		1,739
2015	—		—		—		—		—		—		127,039		117,582		131,777		130,452		4,367
2016	—		—		—		—		—		—		—		167,989		174,562		181,858		11,130
2017	—		—		—		—		—		—		—		—		206,604		200,535		24,102
2018	—		—		—		—		—		—		—		—		—		108,281		40,135
Total																			$	1,088,864

Cumulative Paid Claims and Claim Adjustment Expenses, Net of Reinsurance
For the Year Ended December 31,
	Unaudited
Accident Year	2009		2010		2011		2012		2013		2014		2015		2016		2017		2018
2009	$	9,766	$	21,945	$	28,226	$	29,444	$	31,248	$	31,238	$	32,540	$	34,759	$	34,027	$	35,158
2010	—		23,654		37,739		42,413		43,898		44,824		46,419		49,048		49,303		50,053
2011	—		—		31,478		58,875		73,359		76,010		78,577		81,780		82,322		83,401
2012	—		—		—		15,675		51,774		64,238		70,672		77,540		79,099		81,808
2013	—		—		—		—		36,609		74,602		92,646		101,553		104,333		106,051
2014	—		—		—		—		—		38,919		67,000		82,329		88,507		91,646
2015	—		—		—		—		—		—		53,498		89,228		109,187		118,686
2016	—		—		—		—		—		—		—		78,969		133,653		157,622
2017	—		—		—		—		—		—		—		—		72,157		141,458
2018	—		—		—		—		—		—		—		—		—		34,125
Total																			$	900,008
	Reserves for loss and loss adjustment expenses before 2009, net of reinsurance																		776
	Reserves for loss and loss adjustment expenses, net of reinsurance																		$	189,632

Reconciliation of net incurred and paid claims development to reserves for loss and loss adjustment expenses

The reconciliation of the net incurred and paid claims development tables to the reserves for loss and loss adjustment expenses in the consolidated balance sheet is as follows:

(In thousands)		December 31, 2018
Undiscounted reserves for loss and loss expenses, net of reinsurance:
	Other liability	$	3,696,372
	Primary workers' compensation	1,911,057
	Excess workers' compensation	1,320,257
	Professional liability	904,790
	Commercial automobile	633,872
	Short-tail lines	531,217
	Other	111,779
	Insurance	9,109,344
	Casualty	1,512,999
	Property	189,632
	Reinsurance	1,702,631
Total undiscounted reserves for loss and loss expenses, net of reinsurance		$	10,811,975

(In thousands)		December 31, 2018
Due from reinsurers on unpaid claims:
	Other liability	$	451,073
	Primary workers' compensation	374,805
	Excess workers' compensation	37,405
	Professional liability	344,958
	Commercial automobile	15,405
	Short-tail lines	293,376
	Other	34,260
	Insurance	1,551,282
	Casualty	116,782
	Property	49,501
	Reinsurance	166,283
Total due from reinsurers on unpaid claims		$	1,717,565

(In thousands)		December 31, 2018
Loss reserve discount:
	Other liability	$	—
	Primary workers' compensation	—
	Excess workers' compensation	(434,302		)
	Professional liability	—
	Commercial automobile	—
	Short-tail lines	—
	Other	—
	Insurance	(434,302		)
	Casualty	(128,790		)
	Property	—
	Reinsurance	(128,790		)
Total loss reserve discount		$	(563,092	)
Total gross reserves for loss and loss expenses		$	11,966,448

Supplementary information regarding average historical claims duration

The following is supplementary information regarding average historical claims duration as of December 31, 2018:

Insurance
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance
Years	1		2		3		4		5		6		7		8		9		10
Other liability	8.0	%	14.4	%	18.4	%	16.8	%	13.8	%	8.2	%	5.9	%	3.0	%	2.8	%	1.8	%
Primary workers' compensation	22.5	%	27.6	%	15.6	%	9.4	%	5.9	%	4.0	%	2.8	%	1.9	%	1.6	%	1.1	%
Excess workers' compensation	3.8	%	3.3	%	2.7	%	3.1	%	3.0	%	3.3	%	2.7	%	3.3	%	3.5	%	2.6	%
Professional liability	8.7	%	22.7	%	22.3	%	16.6	%	9.4	%	9.1	%	3.5	%	1.6	%	4.3	%	2.5	%
Commercial automobile	39.7	%	21.6	%	15.6	%	10.7	%	6.8	%	3.5	%	1.0	%	0.4	%	0.2	%	—	%
Short-tail lines	59.6	%	29.8	%	5.8	%	1.6	%	0.1	%	0.3	%	0.4	%	0.3	%	—	%	1.4	%
Reinsurance
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance
Years	1		2		3		4		5		6		7		8		9		10
Casualty	7.2	%	12.5	%	14.6	%	13.3	%	11.2	%	9.0	%	5.9	%	5.2	%	3.8	%	2.8	%
Property	35.3	%	32.3	%	14.8	%	5.5	%	3.9	%	2.0	%	3.2	%	2.7	%	—	%	3.2	%

Reconciliation of beginning and ending reserve balance

The table below provides a reconciliation of the beginning and ending reserve balances:

(In thousands)	2018			2017			2016
Net reserves at beginning of year	$	10,056,914		$	9,590,265		$	9,244,872
Net provision for losses and loss expenses:
Claims occurring during the current year (1)	3,926,489			3,963,543			3,826,620
Increase (decrease) in estimates for claims occurring in prior years (2)	6,831			(5,165		)	(29,904		)
Loss reserve discount accretion	41,382			43,970			49,084
Total	3,974,702			4,002,348			3,845,800
Net payments for claims:
Current year	964,808			1,027,405			1,052,452
Prior year	2,700,077			2,562,550			2,401,722
Total	3,664,885			3,589,955			3,454,174
Foreign currency translation	(117,848		)	54,256			(46,233		)
Net reserves at end of year	10,248,883			10,056,914			9,590,265
Ceded reserve at end of year	1,717,565			1,613,494			1,606,930
Gross reserves at end of year	$	11,966,448		$	11,670,408		$	11,197,195

_______________________________________

(1) Claims occurring during the current year are net of loss reserve discounts of $24,381,000, $22,064,000 and $18,929,000 in 2018, 2017, and 2016, respectively.

(2)

The increase (decrease) in estimates for claims occurring in prior years is net of loss reserve discount. On an undiscounted basis, the estimates for claims occurring in prior years decreased by $3,738,000, $32,132,000 and $59,175,000 in 2018, 2017 and 2016, respectively.

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Reinsurance (Tables)

12 Months Ended

Dec. 31, 2018

Reinsurance Disclosures [Abstract]

Reinsurance Financial Information

The following is a summary of reinsurance financial information:

(In thousands)	2018			2017			2016
Written premiums:
Direct	$	6,973,216		$	6,726,029		$	6,647,600
Assumed	729,278			750,934			896,101
Ceded	(1,269,267		)	(1,216,455		)	(1,119,788		)
Total net written premiums	$	6,433,227		$	6,260,508		$	6,423,913
Earned premiums:
Direct	$	6,851,795		$	6,661,046		$	6,492,240
Assumed	755,759			812,309			900,570
Ceded	(1,236,049		)	(1,161,936		)	(1,099,462		)
Total net earned premiums	$	6,371,505		$	6,311,419		$	6,293,348
Ceded losses and loss expenses incurred	$	829,742		$	601,769		$	707,336
Ceded commission earned	$	268,037		$	241,983		$	201,957

Schedule of Ceded Credit Risk by Reinsurer

The following table presents the amounts due from reinsurers as of December 31, 2018:

(In thousands)
Lloyd’s of London	$	215,370
Munich Re	164,131
Alleghany Group	150,438
Swiss Re	150,280
Partner Re	103,837
Berkshire Hathaway	87,314
Axis Capital	85,377
Hannover Re Group	77,351
Everest Re	62,113
Korean Re	52,746
Renaissance Re	39,944
Liberty Mutual	32,118
Qatar Re GRP	27,731
Chubb Limited	24,628
Arch Capital Group	21,260
Other reinsurers less than $20,000	289,305
Subtotal	1,583,943
Residual market pools	348,348
Total	$	1,932,291

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Indebtedness (Tables)

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Schedule of Debt

Indebtedness consisted of the following as of December 31, 2018 (the difference between the face value and the carrying value is unamortized discount and debt issuance costs):

				Carrying Value
(In thousands)	Interest Rate	Face Value		2018		2017
Senior notes due on:
August 15, 2019	6.15%	$	140,651	$	140,568	$	140,434
September 15, 2019	7.375%	300,000		299,816		299,562
September 15, 2020	5.375%	300,000		299,420		299,083
January 1, 2022	8.7%	76,503		76,273		76,210
March 15, 2022	4.625%	350,000		348,670		348,252
February 15, 2037	6.25%	250,000		248,006		247,896
August 1, 2044	4.75%	350,000		345,283		345,099
Subsidiary debt (1) (2)	Various	123,992		123,992		12,516
Total senior notes and other debt		$	1,891,146	$	1,882,028	$	1,769,052
Subordinated debentures due on:
April 30, 2053	5.625%	$	350,000	$	341,097	$	340,838
March 1, 2056	5.9%	110,000		106,159		106,055
June 1, 2056	5.75%	290,000		281,551		281,325
March 30, 2058	5.70%	185,000		178,684		—
Total subordinated debentures		$	935,000	$	907,491	$	728,218

________________

(1) Subsidiary debt is due as follows:

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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expense (Benefit)

Income tax expense (benefit) consists of:

(In thousands)	Current Expense (Benefit)		Deferred Expense (Benefit)			Total
December 31, 2018
Domestic	$	188,712	$	(63,134	)	$	125,578
Foreign	13,963		23,487			37,450
Total expense (benefit)	$	202,675	$	(39,647	)	$	163,028
December 31, 2017
Domestic	$	225,694	$	(27,601	)	$	198,093
Foreign	8,803		12,537			21,340
Total expense (benefit)	$	234,497	$	(15,064	)	$	219,433
December 31, 2016
Domestic	$	259,539	$	3,355		$	262,894
Foreign	23,634		6,425			30,059
Total expense	$	283,173	$	9,780		$	292,953

Schedule of Effective Income Tax Rate Reconciliation

A reconciliation of the income tax expense and the amounts computed by applying the Federal and foreign income tax rate of 21% for 2018 and 35% for 2017 and 2016 to pre-tax income are as follows:

(In thousands)	2018			2017			2016
Computed “expected” tax expense	$	170,540		$	270,470		$	313,753
Tax-exempt investment income	(18,833		)	(37,209		)	(37,379		)
Change in valuation allowance	18,576			11,161			1,420
Impact of foreign tax rates	7,683			3,508			1,984
State and local taxes	3,901			1,644			7,748
Impact of change in U.S. tax rate	(10,950		)	(30,531		)	—
Other, net	(7,889		)	390			5,427
Total expense	$	163,028		$	219,433		$	292,953

Schedule of Deferred Tax Assets and Liabilities

(In thousands)	2018			2017			2016
Computed “expected” tax expense	$	170,540		$	270,470		$	313,753
Tax-exempt investment income	(18,833		)	(37,209		)	(37,379		)
Change in valuation allowance	18,576			11,161			1,420
Impact of foreign tax rates	7,683			3,508			1,984
State and local taxes	3,901			1,644			7,748
Impact of change in U.S. tax rate	(10,950		)	(30,531		)	—
Other, net	(7,889		)	390			5,427
Total expense	$	163,028		$	219,433		$	292,953

At December 31, 2018 and 2017, the tax effects of differences that give rise to significant portions of the deferred tax asset and deferred tax liability are as follows:

(In thousands)	2018			2017
Deferred tax asset:
Loss reserve discounting	$	130,513		$	70,206
Unearned premiums	112,190			110,854
Net operating losses	37,463			33,043
Other-than-temporary impairments	9,910			8,204
Employee compensation plans	56,027			59,037
Other	58,809			49,346
Gross deferred tax asset	404,912			330,690
Less valuation allowance	(35,195		)	(16,619		)
Deferred tax asset	369,717			314,071
Deferred tax liability:
Amortization of intangibles	13,641			12,826
Loss reserve discounting - transition rule	41,088			—
Deferred policy acquisition costs	99,293			100,020
Unrealized investment gains	35,430			151,162
Property, furniture and equipment	39,239			31,865
Investment funds	51,712			41,104
Other	53,824			63,858
Deferred tax liability	334,227			400,835
Net deferred tax (asset) liability	$	(35,490	)	$	86,764

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Dividends From Subsidiaries And Statutory Financial Information (Tables)

12 Months Ended

Dec. 31, 2018

Insurance [Abstract]

Schedule of Combined Net Income and Policyholders' Surplus in Accordance with Statutory Accounting Practices

BIC’s combined net income and statutory capital and surplus, as determined in accordance with statutory accounting practices (SAP), are as follows:

(In thousands)	2018		2017		2016
Net income	$	1,099,953	$	698,862	$	702,830
Statutory capital and surplus	$	5,587,930	$	5,479,603	$	5,493,044

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Common Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2018

Equity [Abstract]

Weighted Average Number of Common Shares Used In the Computation of Basic and Diluted Earnings per Share

The weighted average number of shares used in the computation of net income per share was as follows:

	2018	2017	2016
Basic	126,698,927	124,843,240	122,650,997
Diluted	128,263,558	129,017,613	128,552,838

Schedule of Changes in Shares of Common Stock Outstanding

Changes in shares of common stock outstanding, net of treasury shares, are presented below. Shares of common stock issued and outstanding do not include shares related to unissued restricted stock units (including shares held in the grantor trust).

	2018		2017		2016
Balance, beginning of year	121,514,852		121,193,599		123,307,837
Shares issued	838,508		1,052,256		281,654
Shares repurchased	(357,600	)	(731,003	)	(2,395,892)
Balance, end of year	121,995,760		121,514,852		121,193,599

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Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2018

Fair Value Disclosures [Abstract]

Carrying Amounts and Estimated Fair Values of Financial Insruments

The following table presents the carrying amounts and estimated fair values of the Company’s financial instruments as of December 31, 2018 and 2017:

	2018				2017
(In thousands)	Carrying Value		Fair Value		Carrying Value		Fair Value
Assets:
Fixed maturity securities	$	13,606,812	$	13,619,620	$	13,551,250	$	13,566,976
Equity securities	279,006		279,006		576,647		576,647
Arbitrage trading account	452,548		452,548		617,649		617,649
Loans receivable	94,813		97,073		79,684		82,047
Cash and cash equivalents	817,602		817,602		950,471		950,471
Trading accounts receivable from brokers and clearing organizations	347,228		347,228		189,280		189,280
Liabilities:
Due to broker	20,144		20,144		15,920		15,920
Trading account securities sold but not yet purchased	38,120		38,120		64,358		64,358
Subordinated debentures	907,491		840,002		728,218		769,060
Senior notes and other debt	1,882,028		1,968,996		1,769,052		1,945,313

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Stock Incentive Plan (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Nonvested Restricted Stock Units Activity

The following table summarizes RSU information for the three years ended December 31, 2018:

	2018		2017		2016
RSUs granted and unvested at beginning of period:	3,477,981		4,862,098		4,158,325
Granted	760,032		855,984		1,000,559
Vested	(600,169	)	(1,993,507	)	(77,250	)
Canceled	(263,411	)	(246,594	)	(219,536	)
RSUs granted and unvested at end of period:	3,374,433		3,477,981		4,862,098

Schedule of Share-based Compensation, Unearned Compensation Related to RSU's

The fair value of RSUs at the date of grant are recorded as unearned compensation, a component of stockholders’ equity, and expensed over the vesting period. Following is a summary of changes in unearned compensation for the three years ended December 31, 2018:

(In thousands)	2018			2017			2016
Unearned compensation at beginning of year	$	122,910		$	115,965		$	103,538
RSUs granted, net of cancellations	52,204			52,897			52,697
RSUs expensed	(34,408		)	(38,796		)	(35,585		)
RSUs forfeitures	(11,037		)	(7,156		)	(4,685		)
Unearned compensation at end of year	$	129,669		$	122,910		$	115,965

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Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2018

Compensation Related Costs [Abstract]

Long-Term Incentive Compensation Plan Expense

The following table summarizes the outstanding LTIP awards as of December 31, 2018:

	Units Outstanding	Maximum Value		Inception to date earned through December 31, 2018 on outstanding units
2014 grant	181,750	$	18,175,000	$	15,328,795
2015 grant	194,750	19,475,000		15,272,295
2016 grant	217,500	21,750,000		12,371,400
2017 grant	223,250	22,325,000		7,822,680
2018 grant	222,750	22,750,000		4,316,895

The following table summarizes the LTIP expense for each of the three years ended December 31, 2018:

(In thousands)	2018			2017		2016
2011 grant	$	—		$	—	$	(82	)
2013 grant	(1,124		)	7,667		8,918
2014 grant	3,227			3,167		3,503
2015 grant	5,170			3,667		4,072
2016 grant	5,148			3,601		4,002
2017 grant	4,700			3,162		—
2018 grant	4,317			—		—
Total	$	21,438		$	21,264	$	20,413

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Supplemental Financial Statement Data (Tables)

12 Months Ended

Dec. 31, 2018

Other Income and Expenses [Abstract]

Schedule of Other Operating Cost and Expense, by Component

Other operating costs and expenses consist of the following:

(In thousands)	2018			2017		2016
Amortization of deferred policy acquisition costs	$	915,246		$	1,111,489	$	1,155,954
Insurance operating expenses	1,183,635			989,535		933,249
Insurance service expenses	118,357			129,776		138,908
Net foreign currency (gains) losses	(27,067		)	15,267		(11,904		)
Other costs and expenses	193,050			190,865		179,412
Total	$	2,383,221		$	2,436,932	$	2,395,619

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Industry Segments (Tables)

12 Months Ended

Dec. 31, 2018

Segment Reporting [Abstract]

Financial Information Of Company Operating Segments

Summary financial information about the Company’s reporting segments is presented in the following table. Income before income taxes by segment includes allocated investment income. Identifiable assets by segment are those assets used in or allocated to the operation of each segment.

	Revenues
(In thousands)	Earned Premiums		Investment Income		Other		Total (1)		Pre-Tax Income (Loss)			Net Income (Loss) to Common Stockholders
Year ended December 31, 2018
Insurance	$	5,864,981	$	518,733	$	72,727	$	6,456,441	$	856,011		$	682,028
Reinsurance	506,524		94,291		—		600,815		62,144			50,144
Corporate, other and eliminations (2)	—		61,211		418,696		479,907		(260,549		)	(213,469		)
Net investment gains	—		—		154,488		154,488		154,488			122,046
Consolidated	$	6,371,505	$	674,235	$	645,911	$	7,691,651	$	812,094		$	640,749
Year ended December 31, 2017
Insurance	$	5,706,443	$	436,178	$	86,864	$	6,229,485	$	756,153		$	535,186
Reinsurance	604,976		91,146		—		696,122		(15,276		)	(5,131		)
Corporate, other and eliminations (2)	—		48,464		374,835		423,299		(303,965		)	(199,269		)
Net investment gains	—		—		335,858		335,858		335,858			218,308
Consolidated	$	6,311,419	$	575,788	$	797,557	$	7,684,764	$	772,770		$	549,094
Year ended December 31, 2016
Insurance	$	5,618,842	$	431,489	$	97,879	$	6,148,210	$	799,139		$	534,613
Reinsurance	674,506		102,617		—		777,123		98,277			68,400
Corporate, other and eliminations (2)	—		30,057		431,789		461,846		(267,983		)	(174,650		)
Net investment gains	—		—		267,005		267,005		267,005			173,553
Consolidated	$	6,293,348	$	564,163	$	796,673	$	7,654,184	$	896,438		$	601,916

Identifiable Assets by Segments

Identifiable Assets
(In thousands)	December 31,
	2018		2017
Insurance	$	19,634,329	$	19,263,193
Reinsurance	2,951,115		3,169,731
Corporate, other and eliminations (2)	2,310,533		1,866,993
Consolidated	$	24,895,977	$	24,299,917

_______________________________________

(1) Revenues for Insurance includes $714.2 million, $688.2 million and $733.3 million in 2018, 2017 and 2016, respectively, from foreign countries. Revenues for Reinsurance includes $228.1 million, $201.3 million and $200.5 million in 2018, 2017 and 2016, respectively, from foreign countries.

(2) Corporate, other and eliminations represent corporate revenues and expenses and other items that are not allocated to business segments.

Net Premiums Earned By Major Line Of Business

Net premiums earned by major line of business are as follows:

(In thousands)	2018		2017		2016
Insurance
Other liability	$	1,912,071	$	1,843,826	$	1,761,748
Workers' compensation	1,489,805		1,481,507		1,402,611
Short-tail lines	1,184,755		1,149,977		1,237,917
Commercial automobile	722,236		685,263		684,626
Professional liability	556,114		545,870		531,940
Total Insurance	5,864,981		5,706,443		5,618,842
Reinsurance
Casualty	362,886		377,650		405,470
Property	143,638		227,326		269,036
Total Reinsurance	506,524		604,976		674,506
Total	$	6,371,505	$	6,311,419	$	6,293,348

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Quarterly Financial Information (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information

The following is a summary of quarterly financial data:

(In thousands, except per share data)	2018
Three months ended	March 31		June 30		September 30		December 31
Revenues	$	1,891,247	$	1,910,916	$	1,937,902	$	1,951,586
Net income	166,397		180,075		161,920		132,357
Net income per share (1)
Basic (2)	1.32		1.42		1.28		1.04
Diluted	1.30		1.40		1.26		1.03

	2017
Three months ended	March 31		June 30		September 30		December 31
Revenues	$	1,870,418	$	1,848,049	$	2,031,342	$	1,934,956
Net income	123,447		109,004		162,054		154,589
Net income per share (1)
Basic (2)	1.01		0.87		1.29		1.22
Diluted	0.96		0.85		1.26		1.21

_______________________________________

(1) Net income per share (“EPS”) in each quarter is computed using the weighted-average number of shares outstanding during that quarter, while EPS for the full year is computed using the weighted-average number of shares outstanding during the year. Thus, the sum of the four quarters EPS does not necessarily equal the full-year EPS.

(2) Basic shares outstanding includes shares held in a grantor trust.

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Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accounting Policies [Abstract]
Unbilled Audit Premiums	$ (4)	$ (4)	$ 8	$ 8
Indefinite-lived Intangible Assets [Line Items]
Basic weighted average number of shares outstanding (in shares)		126,698,927	124,843,240	122,650,997
Deposit contracts, liabilities	45	$ 45	$ 47
Depreciation		54	50	$ 47
Interest payments		155	145	137
Income taxes paid		186	207	$ 232
Other Assets
Indefinite-lived Intangible Assets [Line Items]
Intangible assets, net (excluding goodwill)	$ 104	$ 104	$ 107
Grantor Trust | Restricted Stock Units (RSUs)
Indefinite-lived Intangible Assets [Line Items]
Basic weighted average number of shares outstanding (in shares)	4,926,521

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Summary of Significant Accounting Policies (Recent accounting change) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings	$ 7,558,619		$ 6,956,882
Retained earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment resulting from changes in accounting principles			$ 215,939	$ 0	$ 0
Accounting Standards Update 2016-01 | Retained earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment resulting from changes in accounting principles		$ 291,000
Accounting Standards Update 2018-02 | Retained earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment resulting from changes in accounting principles		(76,000)
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings		$ 1,000

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Consolidated Statement of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning of period	$ 5,451,163
Other comprehensive (loss) gain	(364,426)	$ 12,954	$ 122,325
End of period	5,479,798	5,451,163
Net investment gains	154,488	335,858	267,005
Federal and foreign income taxes	(163,028)	(219,433)	(292,953)
Net income before noncontrolling interests	649,066	553,337	603,485
Unrealized investment gains, before tax	(302,737)	(69,425)
Currency translation adjustments, before tax	(112,099)	64,706
Other comprehensive income (loss), before tax	(414,836)	(4,719)
Unrealized investment gains, tax	50,410	17,673
Currency translation adjustments, tax	0	0
Other comprehensive income (loss), tax	50,410	17,673
Unrealized investment gains, net of tax	(252,327)	(51,752)
Change in unrealized translation adjustments	(112,099)	64,706	(124,193)
Unrealized investment (losses) gains
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning of period	375,421	427,154
Cumulative effect adjustment resulting from changes in accounting principles		(214,539)
Restated beginning of period		160,882
Other comprehensive loss before reclassifications	(246,535)	63,567
Amounts reclassified from AOCI	(5,792)	(115,319)
Other comprehensive (loss) gain	(252,327)	(51,752)
Unrealized investment loss related to non-controlling interest	(46)	19
End of period	(91,491)	375,421	427,154
Unrealized investment (losses) gains | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net investment gains	(7,332)	(177,414)
Federal and foreign income taxes	1,540	62,095
Net income before noncontrolling interests	(5,792)	(115,319)
Currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning of period	(306,880)	(371,586)	(247,393)
Cumulative effect adjustment resulting from changes in accounting principles		0
Restated beginning of period		(306,880)
Other comprehensive loss before reclassifications	(112,099)	64,706
Amounts reclassified from AOCI	0	0
Other comprehensive (loss) gain	(112,099)	64,706
Unrealized investment loss related to non-controlling interest	0	0
End of period	(418,979)	(306,880)	(371,586)
Change in unrealized translation adjustments	(112,099)	64,706	(124,193)
Currency translation adjustments | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net investment gains	0	0
Federal and foreign income taxes	0	0
Net income before noncontrolling interests	0	0
Accumulated other comprehensive (loss) income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning of period	68,541	55,568
Cumulative effect adjustment resulting from changes in accounting principles		(214,539)
Restated beginning of period		(145,998)
Other comprehensive loss before reclassifications	(358,634)	128,273
Amounts reclassified from AOCI	(5,792)	(115,319)
Other comprehensive (loss) gain	(364,426)	12,954
Unrealized investment loss related to non-controlling interest	(46)	19
End of period	(510,470)	68,541	$ 55,568
Accumulated other comprehensive (loss) income | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net investment gains	(7,332)	(177,414)
Federal and foreign income taxes	1,540	62,095
Net income before noncontrolling interests	$ (5,792)	$ (115,319)

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Investments in Fixed Maturity Securities (Investments in Fixed Maturity Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]
Total held to maturity, Amortized Cost	$ 78,635	$ 79,332
Total held to maturity, Gross Unrealized Gains	12,808	15,726
Total held to maturity, Gross Unrealized Losses	0	0
Total held to maturity, Fair Value	91,443	95,058
Total held to maturity, Carrying Value	78,635	79,332
Total available for sale, Amortized Cost	13,596,057	13,242,580
Total available for sale, Gross Unrealized Gains	147,683	289,567
Total available for sale, Gross Unrealized Losses	(215,563)	(60,229)
Total available for sale, Fair Value	13,528,177	13,471,918
Total available for sale, Carrying Value	13,528,177	13,471,918
Total investment in fixed maturity securities, Amortized Cost	13,674,692	13,321,912
Total investments in fixed maturity securities, Gross Unrealized Gains	160,491	305,293
Total investments in fixed maturity securities, Gross Unrealized Losses	(215,563)	(60,229)
Total investments in fixed maturity securities, Fair Value	13,619,620	13,566,976
Total investments in fixed maturity securities, carrying value	13,606,812	13,551,250
U.S. government and government agency
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]
Total available for sale, Amortized Cost	697,931	372,748
Total available for sale, Gross Unrealized Gains	9,219	8,824
Total available for sale, Gross Unrealized Losses	(4,910)	(3,832)
Total available for sale, Fair Value	702,240	377,740
Total available for sale, Carrying Value	702,240	377,740
State and municipal
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]
Total available for sale, Amortized Cost	3,815,515	4,332,067
Total available for sale, Gross Unrealized Gains	81,695	125,601
Total available for sale, Gross Unrealized Losses	(24,612)	(12,574)
Total available for sale, Fair Value	3,872,598	4,445,094
Total available for sale, Carrying Value	3,872,598	4,445,094
Special revenue
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]
Total available for sale, Amortized Cost	2,396,089	2,663,245
Total available for sale, Gross Unrealized Gains	30,507	53,512
Total available for sale, Gross Unrealized Losses	(19,790)	(10,027)
Total available for sale, Fair Value	2,406,806	2,706,730
Total available for sale, Carrying Value	2,406,806	2,706,730
State general obligation
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]
Total available for sale, Amortized Cost	335,626	439,358
Total available for sale, Gross Unrealized Gains	11,951	16,087
Total available for sale, Gross Unrealized Losses	(1,103)	(711)
Total available for sale, Fair Value	346,474	454,734
Total available for sale, Carrying Value	346,474	454,734
Pre-refunded
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]
Total available for sale, Amortized Cost	408,141	436,241
Total available for sale, Gross Unrealized Gains	16,568	22,701
Total available for sale, Gross Unrealized Losses	(30)	(9)
Total available for sale, Fair Value	424,679	458,933
Total available for sale, Carrying Value	424,679	458,933
Corporate backed
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]
Total available for sale, Amortized Cost	272,440	375,268
Total available for sale, Gross Unrealized Gains	4,319	10,059
Total available for sale, Gross Unrealized Losses	(2,350)	(860)
Total available for sale, Fair Value	274,409	384,467
Total available for sale, Carrying Value	274,409	384,467
Local general obligation
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]
Total available for sale, Amortized Cost	403,219	417,955
Total available for sale, Gross Unrealized Gains	18,350	23,242
Total available for sale, Gross Unrealized Losses	(1,339)	(967)
Total available for sale, Fair Value	420,230	440,230
Total available for sale, Carrying Value	420,230	440,230
Total mortgage-backed securities
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]
Total available for sale, Amortized Cost	1,609,446	1,305,281
Total available for sale, Gross Unrealized Gains	9,033	10,825
Total available for sale, Gross Unrealized Losses	(23,933)	(16,175)
Total available for sale, Fair Value	1,594,546	1,299,931
Total available for sale, Carrying Value	1,594,546	1,299,931
Residential mortgage-backed
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]
Total available for sale, Amortized Cost	1,264,376	1,043,629
Total available for sale, Gross Unrealized Gains	7,729	9,304
Total available for sale, Gross Unrealized Losses	(20,225)	(13,547)
Total available for sale, Fair Value	1,251,880	1,039,386
Total available for sale, Carrying Value	1,251,880	1,039,386
Commercial
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]
Total available for sale, Amortized Cost	345,070	261,652
Total available for sale, Gross Unrealized Gains	1,304	1,521
Total available for sale, Gross Unrealized Losses	(3,708)	(2,628)
Total available for sale, Fair Value	342,666	260,545
Total available for sale, Carrying Value	342,666	260,545
Asset-backed securities
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]
Total available for sale, Amortized Cost	2,462,303	2,111,132
Total available for sale, Gross Unrealized Gains	10,131	11,024
Total available for sale, Gross Unrealized Losses	(33,687)	(10,612)
Total available for sale, Fair Value	2,438,747	2,111,544
Total available for sale, Carrying Value	2,438,747	2,111,544
Total corporate
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]
Total available for sale, Amortized Cost	4,188,769	4,302,007
Total available for sale, Gross Unrealized Gains	25,852	101,275
Total available for sale, Gross Unrealized Losses	(103,310)	(14,170)
Total available for sale, Fair Value	4,111,311	4,389,112
Total available for sale, Carrying Value	4,111,311	4,389,112
Industrial
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]
Total available for sale, Amortized Cost	2,295,778	2,574,400
Total available for sale, Gross Unrealized Gains	15,355	52,210
Total available for sale, Gross Unrealized Losses	(53,312)	(7,718)
Total available for sale, Fair Value	2,257,821	2,618,892
Total available for sale, Carrying Value	2,257,821	2,618,892
Financial
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]
Total available for sale, Amortized Cost	1,502,427	1,402,161
Total available for sale, Gross Unrealized Gains	7,178	37,744
Total available for sale, Gross Unrealized Losses	(45,683)	(5,138)
Total available for sale, Fair Value	1,463,922	1,434,767
Total available for sale, Carrying Value	1,463,922	1,434,767
Utilities
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]
Total available for sale, Amortized Cost	330,326	284,886
Total available for sale, Gross Unrealized Gains	2,997	11,316
Total available for sale, Gross Unrealized Losses	(4,148)	(1,248)
Total available for sale, Fair Value	329,175	294,954
Total available for sale, Carrying Value	329,175	294,954
Other
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]
Total available for sale, Amortized Cost	60,238	40,560
Total available for sale, Gross Unrealized Gains	322	5
Total available for sale, Gross Unrealized Losses	(167)	(66)
Total available for sale, Fair Value	60,393	40,499
Total available for sale, Carrying Value	60,393	40,499
Foreign government
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]
Total available for sale, Amortized Cost	822,093	819,345
Total available for sale, Gross Unrealized Gains	11,753	32,018
Total available for sale, Gross Unrealized Losses	(25,111)	(2,866)
Total available for sale, Fair Value	808,735	848,497
Total available for sale, Carrying Value	808,735	848,497
State and municipal
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]
Total held to maturity, Amortized Cost	67,891	65,882
Total held to maturity, Gross Unrealized Gains	11,549	14,499
Total held to maturity, Gross Unrealized Losses	0	0
Total held to maturity, Fair Value	79,440	80,381
Total held to maturity, Carrying Value	67,891	65,882
Residential mortgage-backed
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]
Total held to maturity, Amortized Cost	10,744	13,450
Total held to maturity, Gross Unrealized Gains	1,259	1,227
Total held to maturity, Gross Unrealized Losses	0	0
Total held to maturity, Fair Value	12,003	14,677
Total held to maturity, Carrying Value	$ 10,744	$ 13,450

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Investments in Fixed Maturity Securities (The Amortized Cost and Fair Value of Fixed Maturity Securities) (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Investments, Debt and Equity Securities [Abstract]
Amortized Cost, Due in one year or less	$ 935,354
Amortized Cost, Due after one year through five years	4,666,934
Amortized Cost, Due after five years through ten years	3,037,450
Amortized Cost, Due after ten years	3,414,764
Amortized Cost, Mortgage-backed securities	1,620,190
Total investment in fixed maturity securities, Amortized Cost	13,674,692
Fair Value, Due in one year or less	935,894
Fair Value, Due after one year through five years	4,669,502
Fair Value, Due after five years through ten years	3,045,868
Fair Value, Due after ten years	3,361,807
Fair Value, Mortgage-backed securities	1,606,549
Total investments in fixed maturity securities, Fair Value	$ 13,619,620

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Investments in Fixed Maturity Securities (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]
Held-to-maturity Securities, Restricted	$ 1,332,000,000
Insurance-related Assessments
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]
Held-to-maturity Securities, Restricted	328,000,000
Reinsurance
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]
Held-to-maturity Securities, Restricted	37,000,000
Letters of Credit Outstanding, Amount	3,000,000
523991 Trust, Fiduciary, and Custody Activities
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]
Held-to-maturity Securities, Restricted	1,700,000,000
Residential mortgage-backed
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]
Gross unrealized (losses) gains for debt securities	$ (55,090)	$ 76,467

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Investments in Equity Securities (Investments in Equity Securities Available for Sale) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Equity securities	$ 279,006	$ 576,647
Fair Value
Schedule of Available-for-sale Securities [Line Items]
Cost	228,777	206,005
Gross unrealized gains	76,699	375,199
Gross unrealized losses	(26,470)	(4,557)
Equity securities	279,006	576,647
Fair Value | Common stocks
Schedule of Available-for-sale Securities [Line Items]
Cost	113,576	81,855
Gross unrealized gains	4,335	272,309
Gross unrealized losses	(19,719)	(1,960)
Equity securities	98,192	352,204
Fair Value | Preferred stocks
Schedule of Available-for-sale Securities [Line Items]
Cost	115,201	124,150
Gross unrealized gains	72,364	102,890
Gross unrealized losses	(6,751)	(2,597)
Equity securities	180,814	224,443
Carrying Value
Schedule of Available-for-sale Securities [Line Items]
Equity securities	279,006	576,647
Carrying Value | Common stocks
Schedule of Available-for-sale Securities [Line Items]
Equity securities	98,192	352,204
Carrying Value | Preferred stocks
Schedule of Available-for-sale Securities [Line Items]
Equity securities	$ 180,814	$ 224,443

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Arbitrage Trading Account (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Trading Securities and Derivative Instruments [Abstract]
Arbitrage trading account	$ 452,548	$ 617,649
Options Held | Long
Derivative [Line Items]
Other derivatives not designated as hedging instruments at fair value, net	37
Derivative, notional amount	18,400
Options Held | Short
Derivative [Line Items]
Other derivatives not designated as hedging instruments at fair value, net	58
Derivative, notional amount	$ 11,600

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Net Investment Income (Net Investment Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net Investment Income [Line Items]
Gross investment income	$ 678,596	$ 582,740	$ 573,323
Investment expense	(4,361)	(6,952)	(9,160)
Net investment income	674,235	575,788	564,163
Fixed maturity securities, including cash and cash equivalents and loans receivable
Net Investment Income [Line Items]
Gross investment income	519,269	473,101	444,247
Investment funds
Net Investment Income [Line Items]
Gross investment income	109,349	68,169	99,301
Arbitrage trading account
Net Investment Income [Line Items]
Gross investment income	28,157	19,145	18,693
Real estate
Net Investment Income [Line Items]
Gross investment income	18,591	19,975	7,054
Equity securities
Net Investment Income [Line Items]
Gross investment income	$ 3,230	$ 2,350	$ 4,028

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Investment Funds (Schedule of Investment Funds) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]
Maximum loss exposure	$ 270,200
Investment funds	1,332,818	$ 1,155,677
Income (Losses)	109,349	68,169	$ 99,301
Real estate
Schedule of Equity Method Investments [Line Items]
Investment funds	642,137	606,995
Income (Losses)	61,453	45,068	50,415
Energy
Schedule of Equity Method Investments [Line Items]
Investment funds	75,213	82,882
Income (Losses)	645	(15,764)	19,747
Other funds
Schedule of Equity Method Investments [Line Items]
Investment funds	615,468	465,800
Income (Losses)	$ 47,251	$ 38,865	$ 29,139

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Real Estate (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Real Estate [Abstract]
Properties in operation	$ 1,279,584	$ 451,691
Properties under development	677,508	1,017,910
Total	$ 1,957,092	$ 1,469,601

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Real Estate (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Real Estate [Abstract]
Accumulated depreciation and amortization on properites	$ 44,340,000	$ 25,646,000
Depreciation	20,644,000	$ 9,212,000
Lease future minimum payments 2019	61,458,048
Lease future minimum payments 2020	62,141,471
Lease future minimum payments 2021	61,325,176
Lease future minimum payments 2022	61,077,419
Lease future minimum payments 2023	54,362,011
Lease future minimum payments thereafter	584,592,072
Non-recourse loan
Debt Instrument [Line Items]
Face value of debt	$ 101,750,000
Interest rate	4.21%

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Loans Receivable (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Loans Receivable [Line Items]
Loans receivable	$ 97,073	$ 82,047
Maturity period	10 years
Valuation allowance, Specific	$ 1,200	1,200
Valuation allowance, General	2,183	2,183
Valuation allowance	3,383	3,383
Increase (decrease) in valuation allowance	0	(14)
Loans in nonaccrual status	1,200	4,300
Real Estate
Loans Receivable [Line Items]
Loans receivable	62,289	66,057
Loans receivable	63,047	66,917
Commercial
Loans Receivable [Line Items]
Loans receivable	32,524	13,627
Loans receivable	34,026	15,130
Loans Receivable
Loans Receivable [Line Items]
Loans receivable	$ 94,813	$ 79,684

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Realized and Unrealized Investment Gains and Losses (Realized and Unrealized Investment Gains (Losses)) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Realized and Unrealized Investment Gains (Losses) [Abstract]
Fixed maturity securities, Gains	$ 26,752,000	$ 28,217,000	$ 72,215,000
Fixed maturity securities, Losses	(13,733,000)	(5,342,000)	(6,434,000)
Net realized gains on investment sales	435,150,000	154,539,000	14,201,000
Change in unrealized gains	(320,413,000)	0	0
Investment funds	(212,000)	125,423,000	58,861,000
Real estate	27,816,000	12,880,000	7,757,000
Loans receivable	2,838,000	0	0
Other	1,977,000	20,141,000	138,519,000
Net realized and unrealized gains on investments in earnings before OTTI	160,175,000	335,858,000	285,119,000
Other-than-temporary impairments	5,687,000	0	18,114,000
Net investment gains	154,488,000	335,858,000	267,005,000
Income tax expense	(32,442,000)	(117,550,000)	(93,452,000)
After-tax net realized and unrealized gains on investments in earnings	$ 122,046,000	$ 218,308,000	$ 173,553,000

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Realized and Unrealized Investment Gains and Losses (Change in Unrealized Gains (Losses) of Available For Sales Securities) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018	Dec. 31, 2015
Realized and Unrealized Investment Gains Losses [Line Items]
Total change in unrealized gains (losses) before income taxes and noncontrolling interests	$ (302,737,000)	$ (69,425,000)	$ 371,715,000
Income tax benefit (expense)	50,410,000	17,673,000	(125,315,000)
Noncontrolling interests	(46,000)	19,000	59,000
Total change in unrealized gains and losses	(252,373,000)	(51,733,000)	246,459,000
Investment funds	(212,000)	125,423,000	58,861,000
Gain on sale of other investments	1,977,000	20,141,000	138,519,000
Other-than-temporary impairments	5,687,000	0	18,114,000
Retained earnings
Realized and Unrealized Investment Gains Losses [Line Items]
Cumulative effect adjustment resulting from changes in accounting principles		215,939,000	0		$ 0
Accounting Standards Update 2016-01 | Retained earnings
Realized and Unrealized Investment Gains Losses [Line Items]
Cumulative effect adjustment resulting from changes in accounting principles				$ 291,000,000
Fixed maturity securities
Realized and Unrealized Investment Gains Losses [Line Items]
Total change in unrealized gains (losses) before income taxes and noncontrolling interests	(297,084,000)	(2,192,000)	(107,094,000)
Other-than-temporary impairments	6,000,000
Previously impaired fixed maturity securities
Realized and Unrealized Investment Gains Losses [Line Items]
Total change in unrealized gains (losses) before income taxes and noncontrolling interests	(132,000)	895,000	451,000
Equity securities
Realized and Unrealized Investment Gains Losses [Line Items]
Total change in unrealized gains (losses) before income taxes and noncontrolling interests	0	(77,971,000)	465,727,000
Other-than-temporary impairments			18,000,000
Investment funds
Realized and Unrealized Investment Gains Losses [Line Items]
Total change in unrealized gains (losses) before income taxes and noncontrolling interests	$ (5,521,000)	9,843,000	12,631,000
Office Building in Washington, D.C.
Realized and Unrealized Investment Gains Losses [Line Items]
Investment funds		$ 124,000,000
Aero Precision Industries and Certain Related Aviation Services
Realized and Unrealized Investment Gains Losses [Line Items]
Gain on sale of other investments			$ 135,000,000

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Securities in an Unrealized Loss Position (Securities in an Unrealized Loss Position) (Details) - External Credit Rating, Investment Grade - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
U.S. government and government agency
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Less Than 12 Months, Fair Value	$ 195,359	$ 92,167
Available-for-sale Securities, Less Than 12 Months, Gross Unrealized Losses	933	1,491
Available-for-sale Securities, 12 Months or Greater, Fair Value	130,815	72,055
Available-for-sale Securities, 12 Months or Greater, Gross Unrealized Losses	3,977	2,341
Available-for-sale Securities, Fair Value	326,174	164,222
Available For Sale Securities, Gross Unrealized Losses	4,910	3,832
State and municipal
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Less Than 12 Months, Fair Value	701,700	735,972
Available-for-sale Securities, Less Than 12 Months, Gross Unrealized Losses	6,874	5,944
Available-for-sale Securities, 12 Months or Greater, Fair Value	744,905	345,755
Available-for-sale Securities, 12 Months or Greater, Gross Unrealized Losses	17,738	6,630
Available-for-sale Securities, Fair Value	1,446,605	1,081,727
Available For Sale Securities, Gross Unrealized Losses	24,612	12,574
Mortgage-backed securities
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Less Than 12 Months, Fair Value	334,063	480,435
Available-for-sale Securities, Less Than 12 Months, Gross Unrealized Losses	2,911	5,110
Available-for-sale Securities, 12 Months or Greater, Fair Value	712,595	373,956
Available-for-sale Securities, 12 Months or Greater, Gross Unrealized Losses	21,022	11,065
Available-for-sale Securities, Fair Value	1,046,658	854,391
Available For Sale Securities, Gross Unrealized Losses	23,933	16,175
Asset-backed securities
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Less Than 12 Months, Fair Value	1,687,665	1,127,309
Available-for-sale Securities, Less Than 12 Months, Gross Unrealized Losses	28,965	8,298
Available-for-sale Securities, 12 Months or Greater, Fair Value	342,855	167,412
Available-for-sale Securities, 12 Months or Greater, Gross Unrealized Losses	4,722	2,314
Available-for-sale Securities, Fair Value	2,030,520	1,294,721
Available For Sale Securities, Gross Unrealized Losses	33,687	10,612
Total corporate
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Less Than 12 Months, Fair Value	1,730,513	1,103,747
Available-for-sale Securities, Less Than 12 Months, Gross Unrealized Losses	54,181	8,224
Available-for-sale Securities, 12 Months or Greater, Fair Value	954,763	170,858
Available-for-sale Securities, 12 Months or Greater, Gross Unrealized Losses	49,129	5,946
Available-for-sale Securities, Fair Value	2,685,276	1,274,605
Available For Sale Securities, Gross Unrealized Losses	103,310	14,170
Foreign government
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Less Than 12 Months, Fair Value	246,273	244,139
Available-for-sale Securities, Less Than 12 Months, Gross Unrealized Losses	24,197	2,615
Available-for-sale Securities, 12 Months or Greater, Fair Value	80,004	25,824
Available-for-sale Securities, 12 Months or Greater, Gross Unrealized Losses	914	251
Available-for-sale Securities, Fair Value	326,277	269,963
Available For Sale Securities, Gross Unrealized Losses	25,111	2,866
Fixed maturity securities
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Less Than 12 Months, Fair Value	4,895,573	3,783,769
Available-for-sale Securities, Less Than 12 Months, Gross Unrealized Losses	118,061	31,682
Available-for-sale Securities, 12 Months or Greater, Fair Value	2,965,937	1,155,860
Available-for-sale Securities, 12 Months or Greater, Gross Unrealized Losses	97,502	28,547
Available-for-sale Securities, Fair Value	7,861,510	4,939,629
Available For Sale Securities, Gross Unrealized Losses	$ 215,563	$ 60,229

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Securities in an Unrealized Loss Position (Non-Investment Grade Fixed Maturity Securities) (Details) - External Credit Rating, Non Investment Grade $ in Thousands	Dec. 31, 2018 USD ($)
Foreign government
Schedule of Available-for-sale Securities [Line Items]
Number of Securities	13
Aggregate Fair Value	$ 140,854
Gross Unrealized Loss	$ 21,411
Total corporate
Schedule of Available-for-sale Securities [Line Items]
Number of Securities	13
Aggregate Fair Value	$ 120,078
Gross Unrealized Loss	$ 13,111
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Number of Securities	5
Aggregate Fair Value	$ 8,741
Gross Unrealized Loss	$ 69
Asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Number of Securities	5
Aggregate Fair Value	$ 14,662
Gross Unrealized Loss	$ 2,593
Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Number of Securities	36
Aggregate Fair Value	$ 284,335
Gross Unrealized Loss	$ 37,184

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Securities in an Unrealized Loss Position (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Other-than-temporary impairments	$ 5,687,000	$ 0	$ 18,114,000
Fixed Maturity Securities
Schedule of Available-for-sale Securities [Line Items]
Other-than-temporary impairments	$ 6,000,000	$ 0

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Fair Value Measurements (Assets and Liabilities Measured At Fair Value, On a Recurring Basis) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities available for sale	$ 13,528,177	$ 13,471,918
Equity securities	279,006	576,647
Arbitrage trading account	452,548	617,649
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	29,948	20,385	$ 12,599
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	(456)	19
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	46	650
Impairment of Intangible Assets (Excluding Goodwill)	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	11,523	7,173
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	(7,353)	(56)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net	5,803	0
Asset-backed securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	99	172	183
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	(2)	3
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	46	34
Impairment of Intangible Assets (Excluding Goodwill)	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	(117)	(48)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net	0	0
Debt Securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	99	172	183
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	(2)	3
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	46	34
Impairment of Intangible Assets (Excluding Goodwill)	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	(117)	(48)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net	0	0
Common stocks | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	8,596	9,370	8,754
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	(548)	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)		616
Impairment of Intangible Assets (Excluding Goodwill)	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	(227)	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net	1	0
Preferred stocks | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	3,945	10,843	3,662
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	100	8
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	0	0
Impairment of Intangible Assets (Excluding Goodwill)	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases		7,173
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	(6,998)	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net	0	0
Equity securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	12,541	20,213	12,416
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	(448)	8
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	0	616
Impairment of Intangible Assets (Excluding Goodwill)	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0	7,173
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	(7,225)	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net	1	0
Trading Assets, Excluding Debt and Equity Securities [Member] | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	17,308	0	$ 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	(6)	8
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	0	0
Impairment of Intangible Assets (Excluding Goodwill)	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	11,523	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	(11)	(8)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net	5,802	0
Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities available for sale	13,528,177	13,471,918
Equity securities	279,006	576,647
Arbitrage trading account	452,548	617,649
Total	14,259,731	14,666,214
Securities sold but not yet purchased	38,120	64,358
Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities available for sale	0	0
Equity securities	89,596	342,834
Arbitrage trading account	353,335	471,420
Total	442,931	814,254
Securities sold but not yet purchased	37,327	64,358
Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities available for sale	13,528,078	13,471,746
Equity securities	176,869	213,600
Arbitrage trading account	81,905	146,229
Total	13,786,852	13,831,575
Securities sold but not yet purchased	0	0
Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities available for sale	99	172
Equity securities	12,541	20,213
Arbitrage trading account	17,308	0
Total	29,948	20,385
Securities sold but not yet purchased	793	0
Recurring | U.S. government and government agency
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities available for sale	702,240	377,740
Recurring | U.S. government and government agency | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities available for sale	0	0
Recurring | U.S. government and government agency | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities available for sale	702,240	377,740
Recurring | U.S. government and government agency | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities available for sale	0	0
Recurring | State and municipal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities available for sale	3,872,598	4,445,094
Recurring | State and municipal | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities available for sale	0	0
Recurring | State and municipal | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities available for sale	3,872,598	4,445,094
Recurring | State and municipal | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities available for sale	0	0
Recurring | Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities available for sale	1,594,546	1,299,931
Recurring | Mortgage-backed securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities available for sale	0	0
Recurring | Mortgage-backed securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities available for sale	1,594,546	1,299,931
Recurring | Mortgage-backed securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities available for sale	0	0
Recurring | Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities available for sale	2,438,747	2,111,544
Recurring | Asset-backed securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities available for sale	0	0
Recurring | Asset-backed securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities available for sale	2,438,648	2,111,372
Recurring | Asset-backed securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities available for sale	99	172
Recurring | Corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities available for sale	4,111,311	4,389,112
Recurring | Corporate | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities available for sale	0	0
Recurring | Corporate | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities available for sale	4,111,311	4,389,112
Recurring | Corporate | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities available for sale	0	0
Recurring | Foreign government
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities available for sale	808,735	848,497
Recurring | Foreign government | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities available for sale	0	0
Recurring | Foreign government | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities available for sale	808,735	848,497
Recurring | Foreign government | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities available for sale	0	0
Recurring | Common stocks
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	98,192	352,204
Recurring | Common stocks | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	89,596	342,834
Recurring | Common stocks | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	0	0
Recurring | Common stocks | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	8,596	9,370
Recurring | Preferred stocks
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	180,814	224,443
Recurring | Preferred stocks | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	0	0
Recurring | Preferred stocks | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	176,869	213,600
Recurring | Preferred stocks | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	$ 3,945	$ 10,843

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Reserves For Losses And Loss Expenses (Loss and Loss Expenses Incurred, Net of Reinsurance, and Cumulative Paid Claims and Claim Adjustment Expenses, Net of Reinsurance) (Details) $ in Thousands	Dec. 31, 2018 USD ($) claim	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)
Claims Development [Line Items]
Reserves for loss and loss adjustment expenses, net of reinsurance	$ 10,811,975
Other liability
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	8,326,367
Cumulative paid claims and claim adjustment expenses, net of reinsurance	4,751,400
Reserves for loss and loss adjustment expenses before 2009, net of reinsurance	121,405
Reserves for loss and loss adjustment expenses, net of reinsurance	3,696,372
Primary workers' compensation
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	5,801,492
Cumulative paid claims and claim adjustment expenses, net of reinsurance	4,061,332
Reserves for loss and loss adjustment expenses before 2009, net of reinsurance	170,897
Reserves for loss and loss adjustment expenses, net of reinsurance	1,911,057
Excess workers' compensation
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	721,272
Cumulative paid claims and claim adjustment expenses, net of reinsurance	141,892
Reserves for loss and loss adjustment expenses before 2009, net of reinsurance	740,877
Reserves for loss and loss adjustment expenses, net of reinsurance	1,320,257
Professional liability
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	2,586,052
Cumulative paid claims and claim adjustment expenses, net of reinsurance	1,685,460
Reserves for loss and loss adjustment expenses before 2009, net of reinsurance	4,198
Reserves for loss and loss adjustment expenses, net of reinsurance	904,790
Commercial automobile
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	3,901,666
Cumulative paid claims and claim adjustment expenses, net of reinsurance	3,270,276
Reserves for loss and loss adjustment expenses before 2009, net of reinsurance	2,482
Reserves for loss and loss adjustment expenses, net of reinsurance	633,872
Short-tail lines
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	5,836,156
Cumulative paid claims and claim adjustment expenses, net of reinsurance	5,307,301
Reserves for loss and loss adjustment expenses before 2009, net of reinsurance	2,362
Reserves for loss and loss adjustment expenses, net of reinsurance	531,217
Casualty
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	2,721,144
Cumulative paid claims and claim adjustment expenses, net of reinsurance	1,577,946
Reserves for loss and loss adjustment expenses before 2009, net of reinsurance	369,801
Reserves for loss and loss adjustment expenses, net of reinsurance	1,512,999
Property
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	1,088,864
Cumulative paid claims and claim adjustment expenses, net of reinsurance	900,008
Reserves for loss and loss adjustment expenses before 2009, net of reinsurance	776
Reserves for loss and loss adjustment expenses, net of reinsurance	189,632
Accident Year 2009 | Other liability
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	542,568	$ 546,746	$ 553,058	$ 557,661	$ 561,784	$ 589,659	$ 599,235	$ 624,991	$ 656,788	$ 689,634
Cumulative paid claims and claim adjustment expenses, net of reinsurance	510,474	500,953	486,893	470,830	429,128	385,068	311,979	214,498	122,850	44,801
IBNR	$ 18,690
Cumulative Number of Reported Claims | claim	23,000
Accident Year 2009 | Primary workers' compensation
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 401,431	398,994	395,288	392,287	394,303	392,158	386,870	326,766	332,303	327,537
Cumulative paid claims and claim adjustment expenses, net of reinsurance	364,712	360,289	352,516	344,771	333,793	317,796	297,079	257,972	197,736	93,647
IBNR	$ 10,693
Cumulative Number of Reported Claims | claim	43,000
Accident Year 2009 | Excess workers' compensation
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 130,790	129,249	134,716	142,768	138,765	148,189	148,223	153,912	153,766	168,762
Cumulative paid claims and claim adjustment expenses, net of reinsurance	41,243	37,817	33,573	29,150	25,272	20,729	14,138	11,037	8,402	5,060
IBNR	$ 21,734
Cumulative Number of Reported Claims | claim	1,000
Accident Year 2009 | Professional liability
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 157,451	152,711	153,492	150,783	150,452	147,994	148,899	145,515	139,091	134,784
Cumulative paid claims and claim adjustment expenses, net of reinsurance	151,499	147,599	144,713	143,950	138,876	127,728	117,683	85,902	52,583	12,604
IBNR	$ 1,087
Cumulative Number of Reported Claims | claim	3,000
Accident Year 2009 | Commercial automobile
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 334,926	334,977	335,089	334,652	336,855	337,915	335,851	340,967	345,139	362,302
Cumulative paid claims and claim adjustment expenses, net of reinsurance	333,677	333,605	333,143	331,482	328,843	312,902	291,925	257,326	209,553	136,433
IBNR	$ 398
Cumulative Number of Reported Claims | claim	39,000
Accident Year 2009 | Short-tail lines
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 317,098	316,220	314,010	314,117	314,290	318,349	318,111	326,440	335,921	346,870
Cumulative paid claims and claim adjustment expenses, net of reinsurance	315,966	311,655	311,357	311,079	310,428	309,916	306,020	304,634	291,338	212,521
IBNR	$ 550
Cumulative Number of Reported Claims | claim	18,000
Accident Year 2009 | Casualty
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 279,372	281,592	288,115	282,411	293,275	301,495	309,228	327,236	328,321	334,804
Cumulative paid claims and claim adjustment expenses, net of reinsurance	228,990	221,141	211,143	196,775	181,946	155,124	124,030	85,761	53,636	21,332
IBNR	17,086
Accident Year 2009 | Property
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	35,763	35,293	36,263	36,913	37,505	38,124	38,711	42,352	43,193	48,029
Cumulative paid claims and claim adjustment expenses, net of reinsurance	35,158	34,027	34,759	32,540	31,238	31,248	29,444	28,226	21,945	$ 9,766
IBNR	0
Accident Year 2010 | Other liability
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	566,695	571,305	573,532	574,780	577,679	590,818	592,117	615,797	612,210
Cumulative paid claims and claim adjustment expenses, net of reinsurance	525,016	508,359	491,104	461,442	417,166	336,243	248,698	128,946	45,193
IBNR	$ 26,658
Cumulative Number of Reported Claims | claim	23,000
Accident Year 2010 | Primary workers' compensation
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 424,374	427,698	429,762	429,952	426,622	418,315	409,237	361,808	358,734
Cumulative paid claims and claim adjustment expenses, net of reinsurance	388,405	382,665	374,013	362,078	344,631	317,986	279,226	214,034	107,742
IBNR	$ 13,958
Cumulative Number of Reported Claims | claim	45,000
Accident Year 2010 | Excess workers' compensation
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 95,374	94,986	100,065	104,732	100,331	118,712	120,272	123,497	135,639
Cumulative paid claims and claim adjustment expenses, net of reinsurance	22,355	18,821	14,261	11,699	9,084	8,701	5,571	4,003	2,867
IBNR	$ 14,497
Cumulative Number of Reported Claims | claim	1,000
Accident Year 2010 | Professional liability
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 182,818	177,844	174,883	172,585	176,723	177,957	179,383	165,755	147,649
Cumulative paid claims and claim adjustment expenses, net of reinsurance	178,879	171,330	165,018	160,598	144,474	129,757	108,566	58,916	14,832
IBNR	$ 1,807
Cumulative Number of Reported Claims | claim	4,000
Accident Year 2010 | Commercial automobile
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 329,942	330,263	330,552	331,581	332,716	328,854	330,190	320,098	310,591
Cumulative paid claims and claim adjustment expenses, net of reinsurance	327,829	327,206	326,770	324,963	313,253	295,347	263,639	208,790	136,029
IBNR	$ 372
Cumulative Number of Reported Claims | claim	37,000
Accident Year 2010 | Short-tail lines
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 346,172	346,463	346,885	346,719	346,226	355,916	358,373	370,291	385,541
Cumulative paid claims and claim adjustment expenses, net of reinsurance	345,106	345,085	344,102	342,918	340,210	346,768	337,686	325,156	245,036
IBNR	$ 833
Cumulative Number of Reported Claims | claim	19,000
Accident Year 2010 | Casualty
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 248,145	249,062	251,308	254,550	265,771	276,234	288,141	298,300	290,285
Cumulative paid claims and claim adjustment expenses, net of reinsurance	190,295	180,544	165,027	149,322	129,041	106,381	77,191	45,626	17,964
IBNR	18,428
Accident Year 2010 | Property
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	50,932	50,699	50,871	50,971	51,500	51,448	52,561	55,647	58,576
Cumulative paid claims and claim adjustment expenses, net of reinsurance	50,053	49,303	49,048	46,419	44,824	43,898	42,413	37,739	$ 23,654
IBNR	201
Accident Year 2011 | Other liability
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	634,264	645,123	649,055	653,864	659,026	660,023	673,730	665,035
Cumulative paid claims and claim adjustment expenses, net of reinsurance	575,194	556,110	524,314	470,849	379,845	266,780	142,713	48,825
IBNR	$ 30,381
Cumulative Number of Reported Claims | claim	24,000
Accident Year 2011 | Primary workers' compensation
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 471,471	475,729	474,076	472,087	470,026	454,797	442,550	419,364
Cumulative paid claims and claim adjustment expenses, net of reinsurance	428,811	420,945	408,304	385,759	355,909	307,873	234,694	106,157
IBNR	$ 17,942
Cumulative Number of Reported Claims | claim	46,000
Accident Year 2011 | Excess workers' compensation
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 74,109	78,246	83,850	85,299	87,064	98,051	93,993	88,650
Cumulative paid claims and claim adjustment expenses, net of reinsurance	21,463	20,164	18,638	15,684	12,104	6,395	4,848	2,593
IBNR	$ 17,280
Cumulative Number of Reported Claims | claim	1,000
Accident Year 2011 | Professional liability
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 175,963	176,865	173,545	177,128	190,096	186,918	165,233	179,875
Cumulative paid claims and claim adjustment expenses, net of reinsurance	168,874	167,286	159,014	150,840	134,608	103,097	62,442	18,779
IBNR	$ 3,185
Cumulative Number of Reported Claims | claim	4,000
Accident Year 2011 | Commercial automobile
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 343,524	342,052	341,162	341,362	331,694	328,269	320,898	312,224
Cumulative paid claims and claim adjustment expenses, net of reinsurance	340,319	338,283	333,949	321,786	296,332	262,659	211,756	135,350
IBNR	$ 1,232
Cumulative Number of Reported Claims | claim	37,000
Accident Year 2011 | Short-tail lines
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 451,211	449,320	450,115	457,011	459,814	463,006	471,555	478,556
Cumulative paid claims and claim adjustment expenses, net of reinsurance	450,155	447,342	446,745	445,073	440,777	436,585	417,701	303,012
IBNR	$ 1,093
Cumulative Number of Reported Claims | claim	21,000
Accident Year 2011 | Casualty
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 292,162	295,576	303,867	306,911	299,628	304,409	309,621	290,635
Cumulative paid claims and claim adjustment expenses, net of reinsurance	220,011	207,692	191,864	168,244	134,285	97,702	52,365	17,876
IBNR	21,264
Accident Year 2011 | Property
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	84,882	84,471	84,739	85,006	86,544	85,118	87,970	95,217
Cumulative paid claims and claim adjustment expenses, net of reinsurance	83,401	82,322	81,780	78,577	76,010	73,359	58,875	$ 31,478
IBNR	314
Accident Year 2012 | Other liability
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	718,166	723,610	713,266	709,026	703,118	702,342	693,447
Cumulative paid claims and claim adjustment expenses, net of reinsurance	622,687	580,750	513,644	417,686	299,842	158,869	58,108
IBNR	$ 47,001
Cumulative Number of Reported Claims | claim	24,000
Accident Year 2012 | Primary workers' compensation
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 508,169	512,707	509,167	503,863	503,956	499,882	499,752
Cumulative paid claims and claim adjustment expenses, net of reinsurance	451,991	437,196	419,588	387,368	339,560	253,781	114,998
IBNR	$ 26,626
Cumulative Number of Reported Claims | claim	48,000
Accident Year 2012 | Excess workers' compensation
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 69,361	67,878	72,441	73,653	71,780	73,230	72,366
Cumulative paid claims and claim adjustment expenses, net of reinsurance	17,982	15,738	13,234	11,167	9,480	6,097	1,127
IBNR	$ 16,293
Cumulative Number of Reported Claims | claim	1,000
Accident Year 2012 | Professional liability
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 243,893	245,076	238,704	250,457	264,808	241,944	238,233
Cumulative paid claims and claim adjustment expenses, net of reinsurance	223,424	214,315	190,295	159,183	128,281	87,008	21,875
IBNR	$ 9,507
Cumulative Number of Reported Claims | claim	7,000
Accident Year 2012 | Commercial automobile
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 366,662	364,437	364,175	355,433	342,379	326,585	314,073
Cumulative paid claims and claim adjustment expenses, net of reinsurance	360,799	355,740	344,428	312,178	273,277	215,078	136,844
IBNR	$ 1,539
Cumulative Number of Reported Claims | claim	40,000
Accident Year 2012 | Short-tail lines
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 508,565	506,705	507,646	531,729	535,885	535,500	526,312
Cumulative paid claims and claim adjustment expenses, net of reinsurance	503,738	499,446	498,506	513,733	503,364	453,157	281,456
IBNR	$ 3,083
Cumulative Number of Reported Claims | claim	25,000
Accident Year 2012 | Casualty
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 333,889	335,636	332,932	324,014	331,006	335,661	331,603
Cumulative paid claims and claim adjustment expenses, net of reinsurance	240,926	219,106	186,483	151,635	111,928	62,198	22,390
IBNR	25,536
Accident Year 2012 | Property
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	84,875	83,938	83,925	85,451	86,426	94,720	103,744
Cumulative paid claims and claim adjustment expenses, net of reinsurance	81,808	79,099	77,540	70,672	64,238	51,774	$ 15,675
IBNR	626
Accident Year 2013 | Other liability
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	811,592	805,288	784,342	784,906	792,464	751,544
Cumulative paid claims and claim adjustment expenses, net of reinsurance	650,428	589,564	473,933	332,871	189,936	63,868
IBNR	$ 78,784
Cumulative Number of Reported Claims | claim	26,000
Accident Year 2013 | Primary workers' compensation
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 542,274	547,000	543,238	546,995	547,295	551,342
Cumulative paid claims and claim adjustment expenses, net of reinsurance	466,580	447,894	414,160	363,028	277,538	117,502
IBNR	$ 35,177
Cumulative Number of Reported Claims | claim	53,000
Accident Year 2013 | Excess workers' compensation
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 35,120	38,551	42,419	46,025	48,493	63,995
Cumulative paid claims and claim adjustment expenses, net of reinsurance	4,418	3,396	3,008	2,158	630	647
IBNR	$ 16,473
Cumulative Number of Reported Claims | claim	1,000
Accident Year 2013 | Professional liability
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 279,092	270,449	248,974	242,792	247,320	269,280
Cumulative paid claims and claim adjustment expenses, net of reinsurance	248,520	206,655	177,343	119,552	64,030	24,232
IBNR	$ 15,395
Cumulative Number of Reported Claims | claim	7,000
Accident Year 2013 | Commercial automobile
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 366,565	366,976	376,569	368,318	348,513	326,789
Cumulative paid claims and claim adjustment expenses, net of reinsurance	353,159	343,274	322,141	266,694	218,005	142,480
IBNR	$ 3,013
Cumulative Number of Reported Claims | claim	42,000
Accident Year 2013 | Short-tail lines
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 548,730	552,137	553,621	575,582	583,603	572,103
Cumulative paid claims and claim adjustment expenses, net of reinsurance	539,443	538,158	531,386	534,939	486,692	312,945
IBNR	$ 5,740
Cumulative Number of Reported Claims | claim	26,000
Accident Year 2013 | Casualty
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 298,061	292,447	283,580	273,528	270,221	319,159
Cumulative paid claims and claim adjustment expenses, net of reinsurance	204,820	177,101	143,268	109,202	63,849	28,920
IBNR	33,269
Accident Year 2013 | Property
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	111,876	112,555	111,915	114,063	112,590	141,298
Cumulative paid claims and claim adjustment expenses, net of reinsurance	106,051	104,333	101,553	92,646	74,602	$ 36,609
IBNR	1,192
Accident Year 2014 | Other liability
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	864,157	851,503	847,008	848,947	847,207
Cumulative paid claims and claim adjustment expenses, net of reinsurance	595,024	481,039	338,961	191,394	79,078
IBNR	$ 128,856
Cumulative Number of Reported Claims | claim	26,000
Accident Year 2014 | Primary workers' compensation
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 615,435	617,242	627,767	637,307	639,436
Cumulative paid claims and claim adjustment expenses, net of reinsurance	503,915	471,235	412,611	319,743	148,405
IBNR	$ 57,455
Cumulative Number of Reported Claims | claim	57,000
Accident Year 2014 | Excess workers' compensation
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 41,671	45,758	49,478	57,558	63,465
Cumulative paid claims and claim adjustment expenses, net of reinsurance	5,808	4,175	3,354	1,729	358
IBNR	$ 18,448
Cumulative Number of Reported Claims | claim	1,000
Accident Year 2014 | Professional liability
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 239,555	243,936	259,964	246,668	253,284
Cumulative paid claims and claim adjustment expenses, net of reinsurance	199,245	176,181	138,753	83,856	19,545
IBNR	$ 19,315
Cumulative Number of Reported Claims | claim	8,000
Accident Year 2014 | Commercial automobile
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 413,697	416,194	418,215	384,692	363,308
Cumulative paid claims and claim adjustment expenses, net of reinsurance	394,147	365,424	328,156	237,118	155,065
IBNR	$ 6,431
Cumulative Number of Reported Claims | claim	45,000
Accident Year 2014 | Short-tail lines
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 664,350	663,282	664,303	709,832	701,335
Cumulative paid claims and claim adjustment expenses, net of reinsurance	648,373	633,020	613,621	596,829	371,194
IBNR	$ 6,562
Cumulative Number of Reported Claims | claim	30,000
Accident Year 2014 | Casualty
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 326,251	331,836	319,855	320,176	320,250
Cumulative paid claims and claim adjustment expenses, net of reinsurance	198,993	155,764	116,266	69,134	21,306
IBNR	49,301
Accident Year 2014 | Property
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	99,410	100,148	97,363	96,668	112,987
Cumulative paid claims and claim adjustment expenses, net of reinsurance	91,646	88,507	82,329	67,000	$ 38,919
IBNR	1,739
Accident Year 2015 | Other liability
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	964,415	961,289	986,792	951,041
Cumulative paid claims and claim adjustment expenses, net of reinsurance	538,502	382,498	210,940	82,829
IBNR	$ 217,570
Cumulative Number of Reported Claims | claim	26,000
Accident Year 2015 | Primary workers' compensation
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 641,169	650,997	690,525	712,800
Cumulative paid claims and claim adjustment expenses, net of reinsurance	477,541	421,734	323,744	139,320
IBNR	$ 83,941
Cumulative Number of Reported Claims | claim	58,000
Accident Year 2015 | Excess workers' compensation
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 45,115	50,099	57,897	69,977
Cumulative paid claims and claim adjustment expenses, net of reinsurance	4,099	3,272	2,481	2,069
IBNR	$ 25,425
Cumulative Number of Reported Claims | claim	0
Accident Year 2015 | Professional liability
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 276,406	274,950	258,251	259,569
Cumulative paid claims and claim adjustment expenses, net of reinsurance	187,767	139,952	85,561	20,478
IBNR	$ 47,934
Cumulative Number of Reported Claims | claim	9,000
Accident Year 2015 | Commercial automobile
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 431,857	423,601	417,403	389,101
Cumulative paid claims and claim adjustment expenses, net of reinsurance	370,450	325,369	265,396	159,679
IBNR	$ 18,247
Cumulative Number of Reported Claims | claim	50,000
Accident Year 2015 | Short-tail lines
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 726,606	727,677	731,468	743,872
Cumulative paid claims and claim adjustment expenses, net of reinsurance	689,875	667,846	612,335	396,086
IBNR	$ 15,079
Cumulative Number of Reported Claims | claim	32,000
Accident Year 2015 | Casualty
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 253,264	231,020	232,203	259,609
Cumulative paid claims and claim adjustment expenses, net of reinsurance	141,834	91,548	48,593	17,865
IBNR	30,511
Accident Year 2015 | Property
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	130,452	131,777	117,582	127,039
Cumulative paid claims and claim adjustment expenses, net of reinsurance	118,686	109,187	89,228	$ 53,498
IBNR	4,367
Accident Year 2016 | Other liability
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	1,019,749	1,011,368	1,018,454
Cumulative paid claims and claim adjustment expenses, net of reinsurance	390,552	209,212	69,620
IBNR	$ 375,609
Cumulative Number of Reported Claims | claim	25,000
Accident Year 2016 | Primary workers' compensation
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 684,700	696,339	702,716
Cumulative paid claims and claim adjustment expenses, net of reinsurance	446,072	338,835	142,998
IBNR	$ 117,425
Cumulative Number of Reported Claims | claim	57,000
Accident Year 2016 | Excess workers' compensation
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 71,404	70,281	72,657
Cumulative paid claims and claim adjustment expenses, net of reinsurance	5,573	4,783	2,498
IBNR	$ 37,500
Cumulative Number of Reported Claims | claim	0
Accident Year 2016 | Professional liability
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 361,929	324,979	310,678
Cumulative paid claims and claim adjustment expenses, net of reinsurance	202,131	102,853	28,702
IBNR	$ 90,872
Cumulative Number of Reported Claims | claim	10,000
Accident Year 2016 | Commercial automobile
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 443,030	431,680	431,633
Cumulative paid claims and claim adjustment expenses, net of reinsurance	342,214	280,146	185,045
IBNR	$ 35,867
Cumulative Number of Reported Claims | claim	49,000
Accident Year 2016 | Short-tail lines
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 761,891	774,514	771,416
Cumulative paid claims and claim adjustment expenses, net of reinsurance	710,618	669,029	416,144
IBNR	$ 20,857
Cumulative Number of Reported Claims | claim	34,000
Accident Year 2016 | Casualty
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 246,235	253,450	241,282
Cumulative paid claims and claim adjustment expenses, net of reinsurance	100,587	61,930	19,923
IBNR	62,140
Accident Year 2016 | Property
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	181,858	174,562	167,989
Cumulative paid claims and claim adjustment expenses, net of reinsurance	157,622	133,653	$ 78,969
IBNR	11,130
Accident Year 2017 | Other liability
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	1,100,243	1,067,376
Cumulative paid claims and claim adjustment expenses, net of reinsurance	256,448	80,174
IBNR	$ 567,982
Cumulative Number of Reported Claims | claim	23,000
Accident Year 2017 | Primary workers' compensation
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 733,505	762,093
Cumulative paid claims and claim adjustment expenses, net of reinsurance	362,299	153,456
IBNR	$ 191,034
Cumulative Number of Reported Claims | claim	57,000
Accident Year 2017 | Excess workers' compensation
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 80,508	76,701
Cumulative paid claims and claim adjustment expenses, net of reinsurance	12,810	6,282
IBNR	$ 42,652
Cumulative Number of Reported Claims | claim	1,000
Accident Year 2017 | Professional liability
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 333,194	333,803
Cumulative paid claims and claim adjustment expenses, net of reinsurance	96,814	36,733
IBNR	$ 178,091
Cumulative Number of Reported Claims | claim	9,000
Accident Year 2017 | Commercial automobile
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 428,601	430,352
Cumulative paid claims and claim adjustment expenses, net of reinsurance	267,469	180,627
IBNR	$ 70,289
Cumulative Number of Reported Claims | claim	44,000
Accident Year 2017 | Short-tail lines
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 752,193	750,786
Cumulative paid claims and claim adjustment expenses, net of reinsurance	688,821	444,407
IBNR	$ 34,275
Cumulative Number of Reported Claims | claim	38,000
Accident Year 2017 | Casualty
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 221,820	231,826
Cumulative paid claims and claim adjustment expenses, net of reinsurance	40,338	16,493
IBNR	122,752
Accident Year 2017 | Property
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	200,535	206,604
Cumulative paid claims and claim adjustment expenses, net of reinsurance	141,458	$ 72,157
IBNR	24,102
Accident Year 2018 | Other liability
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	1,104,518
Cumulative paid claims and claim adjustment expenses, net of reinsurance	87,075
IBNR	$ 837,548
Cumulative Number of Reported Claims | claim	18,000
Accident Year 2018 | Primary workers' compensation
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 778,964
Cumulative paid claims and claim adjustment expenses, net of reinsurance	171,006
IBNR	$ 359,337
Cumulative Number of Reported Claims | claim	53,000
Accident Year 2018 | Excess workers' compensation
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 77,820
Cumulative paid claims and claim adjustment expenses, net of reinsurance	6,141
IBNR	$ 46,840
Cumulative Number of Reported Claims | claim	1,000
Accident Year 2018 | Professional liability
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 335,751
Cumulative paid claims and claim adjustment expenses, net of reinsurance	28,307
IBNR	$ 260,095
Cumulative Number of Reported Claims | claim	9,000
Accident Year 2018 | Commercial automobile
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 442,862
Cumulative paid claims and claim adjustment expenses, net of reinsurance	180,213
IBNR	$ 145,744
Cumulative Number of Reported Claims | claim	39,000
Accident Year 2018 | Short-tail lines
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 759,340
Cumulative paid claims and claim adjustment expenses, net of reinsurance	415,206
IBNR	$ 161,107
Cumulative Number of Reported Claims | claim	36,000
Accident Year 2018 | Casualty
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	$ 221,945
Cumulative paid claims and claim adjustment expenses, net of reinsurance	11,152
IBNR	184,317
Accident Year 2018 | Property
Claims Development [Line Items]
Loss and loss expenses incurred, net of reinsurance	108,281
Cumulative paid claims and claim adjustment expenses, net of reinsurance	34,125
IBNR	$ 40,135

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Reserves For Losses And Loss Expenses (Reconciliation of Net Incurred and Paid Claims Development to Reserves for Loss and Loss Adjustment Expenses) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Total undiscounted reserves for loss and loss expenses, net of reinsurance	$ 10,811,975
Total due from reinsurers on unpaid claims	1,717,565
Total loss reserve discount	(563,092)
Total gross reserves for loss and loss expenses	11,966,448	$ 11,670,408	$ 11,197,195
Other liability
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Total undiscounted reserves for loss and loss expenses, net of reinsurance	3,696,372
Primary workers' compensation
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Total undiscounted reserves for loss and loss expenses, net of reinsurance	1,911,057
Excess workers' compensation
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Total undiscounted reserves for loss and loss expenses, net of reinsurance	1,320,257
Professional liability
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Total undiscounted reserves for loss and loss expenses, net of reinsurance	904,790
Commercial automobile
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Total undiscounted reserves for loss and loss expenses, net of reinsurance	633,872
Short-tail lines
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Total undiscounted reserves for loss and loss expenses, net of reinsurance	531,217
Casualty
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Total undiscounted reserves for loss and loss expenses, net of reinsurance	1,512,999
Property
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Total undiscounted reserves for loss and loss expenses, net of reinsurance	189,632
Insurance
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Total undiscounted reserves for loss and loss expenses, net of reinsurance	9,109,344
Total due from reinsurers on unpaid claims	1,551,282
Total loss reserve discount	(434,302)
Insurance | Other liability
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Total undiscounted reserves for loss and loss expenses, net of reinsurance	3,696,372
Total due from reinsurers on unpaid claims	451,073
Total loss reserve discount	0
Insurance | Primary workers' compensation
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Total undiscounted reserves for loss and loss expenses, net of reinsurance	1,911,057
Total due from reinsurers on unpaid claims	374,805
Total loss reserve discount	0
Insurance | Excess workers' compensation
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Total undiscounted reserves for loss and loss expenses, net of reinsurance	1,320,257
Total due from reinsurers on unpaid claims	37,405
Total loss reserve discount	(434,302)
Insurance | Professional liability
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Total undiscounted reserves for loss and loss expenses, net of reinsurance	904,790
Total due from reinsurers on unpaid claims	344,958
Total loss reserve discount	0
Insurance | Commercial automobile
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Total undiscounted reserves for loss and loss expenses, net of reinsurance	633,872
Total due from reinsurers on unpaid claims	15,405
Total loss reserve discount	0
Insurance | Short-tail lines
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Total undiscounted reserves for loss and loss expenses, net of reinsurance	531,217
Total due from reinsurers on unpaid claims	293,376
Total loss reserve discount	0
Insurance | Other
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Total undiscounted reserves for loss and loss expenses, net of reinsurance	111,779
Total due from reinsurers on unpaid claims	34,260
Total loss reserve discount	0
Reinsurance
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Total undiscounted reserves for loss and loss expenses, net of reinsurance	1,702,631
Total due from reinsurers on unpaid claims	166,283
Total loss reserve discount	(128,790)
Reinsurance | Casualty
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Total undiscounted reserves for loss and loss expenses, net of reinsurance	1,512,999
Total due from reinsurers on unpaid claims	116,782
Total loss reserve discount	(128,790)
Reinsurance | Property
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Total undiscounted reserves for loss and loss expenses, net of reinsurance	189,632
Total due from reinsurers on unpaid claims	49,501
Total loss reserve discount	$ 0

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Reserves For Losses And Loss Expenses (Supplementary Information Regarding Average Historical Claims Duration) (Details)	Dec. 31, 2018
Insurance | Other liability
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 1	8.00%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2	14.40%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3	18.40%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 4	16.80%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5	13.80%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6	8.20%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 7	5.90%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 8	3.00%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 9	2.80%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10	1.80%
Insurance | Primary workers' compensation
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 1	22.50%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2	27.60%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3	15.60%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 4	9.40%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5	5.90%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6	4.00%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 7	2.80%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 8	1.90%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 9	1.60%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10	1.10%
Insurance | Excess workers' compensation
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 1	3.80%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2	3.30%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3	2.70%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 4	3.10%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5	3.00%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6	3.30%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 7	2.70%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 8	3.30%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 9	3.50%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10	2.60%
Insurance | Professional liability
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 1	8.70%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2	22.70%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3	22.30%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 4	16.60%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5	9.40%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6	9.10%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 7	3.50%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 8	1.60%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 9	4.30%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10	2.50%
Insurance | Commercial automobile
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 1	39.70%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2	21.60%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3	15.60%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 4	10.70%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5	6.80%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6	3.50%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 7	1.00%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 8	0.40%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 9	0.20%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10	0.00%
Insurance | Short-tail lines
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 1	59.60%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2	29.80%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3	5.80%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 4	1.60%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5	0.10%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6	0.30%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 7	0.40%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 8	0.30%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 9	0.00%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10	1.40%
Reinsurance | Casualty
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 1	7.20%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2	12.50%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3	14.60%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 4	13.30%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5	11.20%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6	9.00%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 7	5.90%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 8	5.20%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 9	3.80%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10	2.80%
Reinsurance | Property
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 1	35.30%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2	32.30%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3	14.80%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 4	5.50%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5	3.90%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6	2.00%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 7	3.20%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 8	2.70%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 9	0.00%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10	3.20%

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Reserves For Losses And Loss Expenses (Schedule of Liability for Unpaid Claims and Claims Adjustment Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Net reserves at beginning of year	$ 10,056,914	$ 9,590,265	$ 9,244,872
Net provision for losses and loss expenses:
Claims occuring during the current year	3,926,489	3,963,543	3,826,620
Decrease in estimates for claims occurring in prior years	6,831	(5,165)	(29,904)
Loss reserve discount accretion	41,382	43,970	49,084
Total	3,974,702	4,002,348	3,845,800
Net payments for claims:
Current year	964,808	1,027,405	1,052,452
Prior year	2,700,077	2,562,550	2,401,722
Total	3,664,885	3,589,955	3,454,174
Foreign currency translation	(117,848)	54,256	(46,233)
Net reserves at end of year	10,248,883	10,056,914	9,590,265
Ceded reserve at end of year	1,717,565	1,613,494	1,606,930
Gross reserves at end of year	11,966,448	11,670,408	11,197,195
Workers' Compensation Discount, Amount	24,381	22,064	18,929
Decrease in estimates for claims occurring in prior years, undiscounted basis	$ 3,738	$ 32,132	$ 59,175

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Reserves For Losses And Loss Expenses (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reserves For Losses And Loss Expenses [Line Items]
Workers' Compensation Discount, Amount	$ 24,381	$ 22,064	$ 18,929
Workers' Compensation Discount, Prior Year Amount		1,855,000
Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims Undiscounted Basis Prior Years, Increase (Decrease)	3,738	32,132	59,175
Prior year	2,700,077	2,562,550	2,401,722
Favorable Reserve Development Net Of Premium Offsets	39,000	37,000	59,000
Reserve for losses and loss adjustment expenses relating to asbestos and environmental claims, net	28,000	30,000
Workers' compensation discount after effects of ceded reinsurance, amount	$ 563,000	591,000
Minimum
Reserves For Losses And Loss Expenses [Line Items]
Workers' compensation discount, percent	2.00%
Maximum
Reserves For Losses And Loss Expenses [Line Items]
Workers' compensation discount, percent	6.50%
Weighted Average
Reserves For Losses And Loss Expenses [Line Items]
Workers' compensation discount, percent	3.80%
Discounted [Member] | Weighted Average
Reserves For Losses And Loss Expenses [Line Items]
Workers' compensation discount, percent	3.00%
Insurance
Reserves For Losses And Loss Expenses [Line Items]
Favorable Reserve Development Net Of Premium Offsets	$ 43,000	68,000	53,000
Reinsurance
Reserves For Losses And Loss Expenses [Line Items]
Favorable Reserve Development Net Of Premium Offsets			$ 6,000
Unfavorable Reserve Development Net Of Premium Offsets	4,000	$ 31,000
Reinsurance Reserves, Ogden Discount Rate		(0.75%)	2.50%
Workers' compensation
Reserves For Losses And Loss Expenses [Line Items]
Workers' Compensation Discount, Amount	$ 1,793,000
Excess workers' compensation
Reserves For Losses And Loss Expenses [Line Items]
Workers' compensation discount, percent	97.00%

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Reinsurance (Reinsurance Financial Information) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reinsurance Disclosures [Abstract]
Written premiums, Direct	$ 6,973,216,000	$ 6,726,029,000	$ 6,647,600,000
Written premiums, Assumed	729,278,000	750,934,000	896,101,000
Written premiums, Ceded	(1,269,267,000)	(1,216,455,000)	(1,119,788,000)
Total net premiums written	6,433,227,000	6,260,508,000	6,423,913,000
Earned premiums, Direct	6,851,795,000	6,661,046,000	6,492,240,000
Earned premiums, Assumed	755,759,000	812,309,000	900,570,000
Earned premiums, Ceded	(1,236,049,000)	(1,161,936,000)	(1,099,462,000)
Net premiums earned	6,371,505,000	6,311,419,000	6,293,348,000
Ceded losses and loss expenses incurred	829,742,000	601,769,000	707,336,000
Ceded commission earned	268,037,000	241,983,000	201,957,000
Uncollectible reinsurance	$ 946,965	$ 1,010,000	$ 1,049,000

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Reinsurance (Schedule Of Ceded Credit Risk by Reinsurer) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Ceded Credit Risk [Line Items]
Ceded reserve at end of year	$ 1,932,291	$ 1,783,200
Credit Risk Reinsurers, Subtotal, Excluding Residual Market Pools [Member]
Ceded Credit Risk [Line Items]
Ceded reserve at end of year	1,583,943
Lloyds of London
Ceded Credit Risk [Line Items]
Ceded reserve at end of year	215,370
Munich Re
Ceded Credit Risk [Line Items]
Ceded reserve at end of year	164,131
Alleghany Group
Ceded Credit Risk [Line Items]
Ceded reserve at end of year	150,438
Swiss Re
Ceded Credit Risk [Line Items]
Ceded reserve at end of year	150,280
Partner Re
Ceded Credit Risk [Line Items]
Ceded reserve at end of year	103,837
Berkshire Hathaway
Ceded Credit Risk [Line Items]
Ceded reserve at end of year	87,314
Axis Capital
Ceded Credit Risk [Line Items]
Ceded reserve at end of year	85,377
Hannover Re Group
Ceded Credit Risk [Line Items]
Ceded reserve at end of year	77,351
Everest Re
Ceded Credit Risk [Line Items]
Ceded reserve at end of year	62,113
Korean Re
Ceded Credit Risk [Line Items]
Ceded reserve at end of year	52,746
Renaissance Re
Ceded Credit Risk [Line Items]
Ceded reserve at end of year	39,944
Liberty Mutual
Ceded Credit Risk [Line Items]
Ceded reserve at end of year	32,118
Qatar Re GRP
Ceded Credit Risk [Line Items]
Ceded reserve at end of year	27,731
Chubb Limited
Ceded Credit Risk [Line Items]
Ceded reserve at end of year	24,628
Arch Capital Group
Ceded Credit Risk [Line Items]
Ceded reserve at end of year	21,260
Other Reinsurers
Ceded Credit Risk [Line Items]
Ceded reserve at end of year	289,305
Residual Market Pools
Ceded Credit Risk [Line Items]
Ceded reserve at end of year	$ 348,348

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Indebtedness (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Subsidiary Debt
Debt Instrument [Line Items]
Face Value	$ 123,992,000
Carrying Value	123,992,000	$ 12,516,000
Repayments in 2019	7,000,000
Repayments in 2020	15,000,000
Repayments thereafter	102,000,000
Total senior notes and other debt
Debt Instrument [Line Items]
Face Value	1,891,146,000
Carrying Value	$ 1,882,028,000	1,769,052,000
Senior Notes | Senior Notes due August 15, 2019
Debt Instrument [Line Items]
Interest Rate	6.15%
Face Value	$ 140,651,000
Carrying Value	$ 140,568,000	140,434,000
Senior Notes | Senior Notes due September 15, 2019
Debt Instrument [Line Items]
Interest Rate	7.375%
Face Value	$ 300,000,000
Carrying Value	$ 299,816,000	299,562,000
Senior Notes | Senior Notes due September 15, 2020
Debt Instrument [Line Items]
Interest Rate	5.375%
Face Value	$ 300,000,000
Carrying Value	$ 299,420,000	299,083,000
Senior Notes | Senior Notes due January 1, 2022
Debt Instrument [Line Items]
Interest Rate	8.70%
Face Value	$ 76,503,000
Carrying Value	$ 76,273,000	76,210,000
Senior Notes | Senior Notes due March 15, 2022
Debt Instrument [Line Items]
Interest Rate	4.625%
Face Value	$ 350,000,000
Carrying Value	$ 348,670,000	348,252,000
Senior Notes | Senior Notes due February 15, 2037
Debt Instrument [Line Items]
Interest Rate	6.25%
Face Value	$ 250,000,000
Carrying Value	$ 248,006,000	247,896,000
Senior Notes | Senior Notes due August 1, 2044
Debt Instrument [Line Items]
Interest Rate	4.75%
Face Value	$ 350,000,000
Carrying Value	345,283,000	345,099,000
Total subordinated debentures
Debt Instrument [Line Items]
Face Value	935,000,000
Carrying Value	$ 907,491,000	728,218,000
Total subordinated debentures | Subordinated Debt due April 30,2053
Debt Instrument [Line Items]
Interest Rate	5.625%
Face Value	$ 350,000,000
Carrying Value	$ 341,097,000	340,838,000
Total subordinated debentures | Subordinated Debt due March 1, 2056
Debt Instrument [Line Items]
Interest Rate	5.90%
Face Value	$ 110,000,000
Carrying Value	$ 106,159,000	106,055,000
Total subordinated debentures | Subordinated Debt due June1, 2056
Debt Instrument [Line Items]
Interest Rate	5.75%
Face Value	$ 290,000,000
Carrying Value	$ 281,551,000	281,325,000
Total subordinated debentures | Subordinated Debt due March 30, 2058
Debt Instrument [Line Items]
Interest Rate	5.70%
Face Value	$ 185,000,000
Carrying Value	$ 178,684,000	$ 0
Non-recourse loan
Debt Instrument [Line Items]
Interest Rate	4.21%
Face Value	$ 101,750,000

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Income Taxes (Schedule of Components of Income Tax Expense (Benefit)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Current Expense, Domestic	$ 188,712	$ 225,694	$ 259,539
Deferred Expense (Benefit), Domestic	(63,134)	(27,601)	3,355
Domestic, Total	125,578	198,093	262,894
Current Expense, Foreign	13,963	8,803	23,634
Deferred Expense (Benefit), Foreign	23,487	12,537	6,425
Foreign, Total	37,450	21,340	30,059
Current Expense, Total	202,675	234,497	283,173
Deferred Expense (Benefit), Total	(39,647)	(15,064)	9,780
Total expense	163,028	219,433	292,953
Income (Loss) from Continuing Operations before Income Taxes, Domestic	755,000	797,000	837,000
Income (Loss) from Continuing Operations before Income Taxes, Foreign	$ 57,000	$ (25,000)	$ 59,000

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Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Computed “expected” tax expense	$ 170,540	$ 270,470	$ 313,753
Tax-exempt investment income	(18,833)	(37,209)	(37,379)
Change in valuation allowance	18,576	11,161	1,420
Impact of foreign tax rates	7,683	3,508	1,984
State and local taxes	3,901	1,644	7,748
Impact of change in U.S. tax rate	(10,950)	(30,531)	0
Other, net	(7,889)	390	5,427
Total expense	$ 163,028	$ 219,433	$ 292,953

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Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Deferred tax asset:
Loss reserve discounting	$ 130,513	$ 47,000	$ 70,206
Unearned premiums	112,190		110,854
Net operating losses	37,463		33,043
Other-than-temporary impairments	9,910		8,204
Employee compensation plans	56,027		59,037
Other	58,809		49,346
Gross deferred tax asset	404,912		330,690
Less valuation allowance	(35,195)		(16,619)
Deferred tax asset	369,717		314,071
Deferred tax liability:
Amortization of intangibles	13,641		12,826
Loss reserve discounting - transition rule	41,088		0
Deferred policy acquisition costs	99,293		100,020
Unrealized investment gains	35,430		151,162
Property, furniture and equipment	39,239		31,865
Investment funds	51,712		41,104
Other	53,824		63,858
Deferred tax liability	334,227		400,835
Net deferred tax (asset) liability	35,490
Net deferred tax (asset) liability			86,764
Operating Loss Carryforwards [Line Items]
Current federal and foreign income taxes	703		0
Current federal income taxes	0		11,327
Valuation allowance	35,200		$ 16,600
Foreign Tax Authority
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, subject to expire	8,800
Operating loss carryforwards, not subject to expire	$ 181,000

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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Net tax benefit related to Tax Act	$ 11,000
Loss reserve discounting	130,513	$ 47,000	$ 70,206
GILTI tax	2,800
undistributed earnings of non-U.S. subsidiaries	$ 70,000

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Dividends From Subsidiaries And Statutory Financial Information (Schedule of Combined Net Income and Policyholders' Surplus in Accordance with Statutory Accounting Practices) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Insurance [Abstract]
Amount available for dividend distribution without prior approval from regulatory authorities	$ 1,100,000
Net income	1,099,953	$ 698,862	$ 702,830
Policyholders' surplus	5,587,930	$ 5,479,603	$ 5,493,044
Increase in BIC's statutory capital and surplus	$ 282,000
Total Adjusted Capital percentage threshold	200.00%
BIC's Total Adjusted Capital balance	$ 5,306,000
BIC's Total Adjusted Capital balance as percentage of RBC Authorized Control Level	384.00%

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Common Stockholders' Equity (Weighted Average Number of Common Shares Used In the Computation of Basic and Diluted Earnings per Share) (Details) - shares	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Class of Stock [Line Items]
Basic		126,698,927	124,843,240	122,650,997
Diluted		128,263,558	129,017,613	128,552,838
Restricted Stock Units (RSUs) | Grantor Trust
Class of Stock [Line Items]
Basic	4,926,521

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Common Stockholders' Equity (Schedule of Changes in Shares of Common Stock Outstanding) (Details) - shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Common Stock Shares Outstanding [Roll Forward]
Balance, beginning of year	121,514,852	121,193,599	123,307,837
Shares issued	838,508	1,052,256	281,654
Shares repurchased	(357,600)	(731,003)	(2,395,892)
Balance, end of year	121,995,760	121,514,852	121,193,599

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Fair Value of Financial Instruments (Carrying Amounts and Estimated Fair Values of Financial Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Assets:
Arbitrage trading account	$ 452,548	$ 617,649
Loans receivable	97,073	82,047
Liabilities:
Due to broker	20,144	15,920
Due to broker	20,144	15,920
Carrying Value
Assets:
Fixed maturity securities	13,606,812	13,551,250
Equity securities	279,006	576,647
Arbitrage trading account	452,548	617,649
Loans receivable	94,813	79,684
Cash and cash equivalents	817,602	950,471
Trading accounts receivable from brokers and clearing organizations	347,228	189,280
Liabilities:
Trading account securities sold but not yet purchased	38,120	64,358
Subordinated debentures	907,491	728,218
Senior notes and other debt	1,882,028	1,769,052
Fair Value
Assets:
Fixed maturity securities	13,619,620	13,566,976
Equity securities	279,006	576,647
Arbitrage trading account	452,548	617,649
Loans receivable	97,073	82,047
Cash and cash equivalents	817,602	950,471
Trading accounts receivable from brokers and clearing organizations	347,228	189,280
Liabilities:
Trading account securities sold but not yet purchased	38,120	64,358
Subordinated debentures	840,002	769,060
Senior notes and other debt	$ 1,968,996	$ 1,945,313

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Lease Obligations (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Leases [Abstract]
Future minimum lease payment - due in 2019	$ 46,592,000
Future minimum lease payment - due in 2020	43,504,000
Future minimum lease payment - due in 2021	39,061,000
Future minimum lease payment - due in 2022	34,444,000
Future minimum lease payment - due in 2023	30,881,000
Future minimum lease payment - due thereafter	75,740,000
Rental expense	$ 45,778,000	$ 52,925,000	$ 47,453,000

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Commitments, Litigation And Contingent Liabilities (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Commitment to Invest in Certain Investment Funds	$ 270.2
Commitment to Invest in Real Estate Construction Projects	$ 253.4

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Stock Incentive Plan (Schedule of Share-based Compensation, Stock Options, Activity) (Details)	12 Months Ended
	Dec. 31, 2018 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred shares	4,709,318
Restricted Stock Units (RSUs) | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Restricted Stock Units (RSUs) | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	5 years

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Stock Incentive Plan (Schedule of Nonvested Restricted Stock Units Activity) (Details) - Restricted Stock Units (RSUs) - shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
RSUs granted and unvested at beginning of period:	3,477,981	4,862,098	4,158,325
Granted	760,032	855,984	1,000,559
Vested	(600,169)	(1,993,507)	(77,250)
Canceled	(263,411)	(246,594)	(219,536)
RSUs granted and unvested at end of period:	3,374,433	3,477,981	4,862,098

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Stock Incentive Plan (Schedule of Share-based Compensation, Unearned Compensation Related to RSU's) (Details) - Restricted Stock Units (RSUs) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Changes In Unearned Compensation [Roll Forward]
Unearned compensation at beginning of year	$ 122,910	$ 115,965	$ 103,538
RSUs granted, net of cancellations	52,204	52,897	52,697
RSUs expensed	34,408	(38,796)	(35,585)
RSUs forfeitures	11,037	(7,156)	(4,685)
Unearned compensation at end of year	$ 129,669	$ 122,910	$ 115,965

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Compensation Plans (Details)	12 Months Ended
	Dec. 31, 2018 USD ($) hour shares	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
LTIP Expense	$ 21,438,000	$ 21,264,000	$ 20,413,000
Deferred Profit Sharing
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Profit Sharing Plan Minimum Contribution, Percent	5.00%
Number of service hours required (in hours) | hour	250
Profit Sharing Plan, Contributions Vesting Immediately, Percent	40.00%
Profit Sharing Plan, Contributions Vesting Based on Years of Service, Percent	60.00%
Profit sharing expense	$ 42,000,000	42,000,000	39,000,000
2011 grant
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
LTIP Expense	$ 0	0	(82,000)
2013 grant
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Deferred Compensation Arrangement With Individual, Company Growth Performance Period	5 years
LTIP Expense	$ (1,124,000)	7,667,000	8,918,000
2014 grant
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Long-Term Incentive Compensation Plan, Number of Units Oustanding | shares	181,750
Long-Term Incentive Compensation Plan, Maximum Value	$ 18,175,000
Long-Term Incentive Compensation Plan, Earned	15,328,795
LTIP Expense	$ 3,227,000	3,167,000	3,503,000
2015 grant
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Long-Term Incentive Compensation Plan, Number of Units Oustanding | shares	194,750
Long-Term Incentive Compensation Plan, Maximum Value	$ 19,475,000
Long-Term Incentive Compensation Plan, Earned	15,272,295
LTIP Expense	$ 5,170,000	3,667,000	4,072,000
2016 grant
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Long-Term Incentive Compensation Plan, Number of Units Oustanding | shares	217,500
Long-Term Incentive Compensation Plan, Maximum Value	$ 21,750,000
Long-Term Incentive Compensation Plan, Earned	12,371,400
LTIP Expense	$ 5,148,000	3,601,000	4,002,000
2017 grant
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Long-Term Incentive Compensation Plan, Number of Units Oustanding | shares	223,250,000
Long-Term Incentive Compensation Plan, Maximum Value	$ 22,325,000
Long-Term Incentive Compensation Plan, Earned	7,822,680
LTIP Expense	$ 4,700,000	3,162,000	0
2018 grant
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Long-Term Incentive Compensation Plan, Number of Units Oustanding | shares	222,750,000
Long-Term Incentive Compensation Plan, Maximum Value	$ 22,750,000
Long-Term Incentive Compensation Plan, Earned	4,316,895
LTIP Expense	$ 4,317,000	$ 0	$ 0

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Supplemental Financial Statement Data (Schedule of Other Operating Cost and Expense, by Component) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Income and Expenses [Abstract]
Amortization of deferred policy acquisition costs	$ 915,246	$ 1,111,489	$ 1,155,954
Insurance operating expenses	1,183,635	989,535	933,249
Insurance service expenses	118,357	129,776	138,908
Net foreign currency (gains) losses	(27,067)	15,267	(11,904)
Other costs and expenses	193,050	190,865	179,412
Total	$ 2,383,221	$ 2,436,932	$ 2,395,619

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Industry Segments (Financial Information of Company Operating Segments) (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) segment	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment									2
Earned Premiums									$ 6,371,505	$ 6,311,419	$ 6,293,348
Investment Income									674,235	575,788	564,163
Net investment gains									154,488	335,858	267,005
Other Revenues									645,911	797,557	796,673
Total revenues	$ 1,951,586	$ 1,937,902	$ 1,910,916	$ 1,891,247	$ 1,934,956	$ 2,031,342	$ 1,848,049	$ 1,870,418	7,691,651	7,684,764	7,654,184
Pre-Tax Income (Loss)									812,094	772,770	896,438
Net investment gains									122,046	218,308	173,553
Net income to common stockholders	$ 132,357	$ 161,920	$ 180,075	$ 166,397	$ 154,589	$ 162,054	$ 109,004	$ 123,447	640,749	549,094	601,916
Insurance
Segment Reporting Information [Line Items]
Earned Premiums									5,864,981	5,706,443	5,618,842
Reinsurance
Segment Reporting Information [Line Items]
Earned Premiums									506,524	604,976	674,506
Operating Segments | Insurance
Segment Reporting Information [Line Items]
Earned Premiums									5,864,981	5,706,443	5,618,842
Investment Income									518,733	436,178	431,489
Other Revenues									72,727	86,864	97,879
Total revenues									6,456,441	6,229,485	6,148,210
Pre-Tax Income (Loss)									856,011	756,153	799,139
Net income to common stockholders									682,028	535,186	534,613
Operating Segments | Reinsurance
Segment Reporting Information [Line Items]
Earned Premiums									506,524	604,976	674,506
Investment Income									94,291	91,146	102,617
Other Revenues									0	0	0
Total revenues									600,815	696,122	777,123
Pre-Tax Income (Loss)									62,144	(15,276)	98,277
Net income to common stockholders									50,144	(5,131)	68,400
Corporate, other and eliminations
Segment Reporting Information [Line Items]
Investment Income									61,211	48,464	30,057
Other Revenues									418,696	374,835	431,789
Total revenues									479,907	423,299	461,846
Pre-Tax Income (Loss)									(260,549)	(303,965)	(267,983)
Net income to common stockholders									$ (213,469)	$ (199,269)	$ (174,650)

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Industry Segments (Identifiable Assets by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting, Asset Reconciling Item [Line Items]
Identifiable Assets	$ 24,895,977				$ 24,299,917				$ 24,895,977	$ 24,299,917
Revenues	1,951,586	$ 1,937,902	$ 1,910,916	$ 1,891,247	1,934,956	$ 2,031,342	$ 1,848,049	$ 1,870,418	7,691,651	7,684,764	$ 7,654,184
Operating Segments | Insurance
Segment Reporting, Asset Reconciling Item [Line Items]
Identifiable Assets	19,634,329				19,263,193				19,634,329	19,263,193
Revenues									6,456,441	6,229,485	6,148,210
Operating Segments | Insurance | Foreign countries
Segment Reporting, Asset Reconciling Item [Line Items]
Revenues									714,200	688,200	733,300
Operating Segments | Reinsurance
Segment Reporting, Asset Reconciling Item [Line Items]
Identifiable Assets	2,951,115				3,169,731				2,951,115	3,169,731
Revenues									600,815	696,122	777,123
Operating Segments | Reinsurance | Foreign countries
Segment Reporting, Asset Reconciling Item [Line Items]
Revenues									228,100	201,300	200,500
Corporate, other and eliminations
Segment Reporting, Asset Reconciling Item [Line Items]
Identifiable Assets	$ 2,310,533				$ 1,866,993				2,310,533	1,866,993
Revenues									$ 479,907	$ 423,299	$ 461,846

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Industry Segments (Net Premiums Earned By Major Line of Business) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net premiums earned	$ 6,371,505	$ 6,311,419	$ 6,293,348
Insurance
Segment Reporting Information [Line Items]
Net premiums earned	5,864,981	5,706,443	5,618,842
Insurance | Other liability
Segment Reporting Information [Line Items]
Net premiums earned	1,912,071	1,843,826	1,761,748
Insurance | Workers' compensation
Segment Reporting Information [Line Items]
Net premiums earned	1,489,805	1,481,507	1,402,611
Insurance | Short-tail lines
Segment Reporting Information [Line Items]
Net premiums earned	1,184,755	1,149,977	1,237,917
Insurance | Commercial automobile
Segment Reporting Information [Line Items]
Net premiums earned	722,236	685,263	684,626
Insurance | Professional liability
Segment Reporting Information [Line Items]
Net premiums earned	556,114	545,870	531,940
Reinsurance
Segment Reporting Information [Line Items]
Net premiums earned	506,524	604,976	674,506
Reinsurance | Casualty
Segment Reporting Information [Line Items]
Net premiums earned	362,886	377,650	405,470
Reinsurance | Property
Segment Reporting Information [Line Items]
Net premiums earned	$ 143,638	$ 227,326	$ 269,036

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Quarterly Financial Information (Unaudited) (Schedule of Quarterly Financial Information) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 1,951,586	$ 1,937,902	$ 1,910,916	$ 1,891,247	$ 1,934,956	$ 2,031,342	$ 1,848,049	$ 1,870,418	$ 7,691,651	$ 7,684,764	$ 7,654,184
Net income	$ 132,357	$ 161,920	$ 180,075	$ 166,397	$ 154,589	$ 162,054	$ 109,004	$ 123,447	$ 640,749	$ 549,094	$ 601,916
Net income per share
Basic (dollars per share)	$ 1.04	$ 1.28	$ 1.42	$ 1.32	$ 1.22	$ 1.29	$ 0.87	$ 1.01	$ 5.06	$ 4.40	$ 4.91
Diluted (dollars per share)	$ 1.03	$ 1.26	$ 1.40	$ 1.30	$ 1.21	$ 1.26	$ 0.85	$ 0.96	$ 5.00	$ 4.26	$ 4.68

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Schedule II - Condensed Financial Information of Registrant (Balance Sheets (Parent Company)) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 30, 2011
Assets:
Cash and cash equivalents	$ 817,602	$ 950,471	$ 795,285	$ 763,631
Fixed maturity securities available for sale at fair value (cost $1,317,058 and $1,059,834 at December 31, 2018 and 2017, respectively)	13,606,812	13,551,250
Equity securities, at fair value (cost $3,430 in 2018 and 2017)	279,006	576,647
Current federal income taxes	703	0
Deferred federal income taxes	35,490	0
Property, furniture and equipment at cost, less accumulated depreciation	416,372	422,960
Other assets	501,413	434,554
Total assets	24,895,977	24,299,917
Liabilities:
Other liabilities	1,005,184	981,987
Current federal income taxes	0	11,327
Deferred federal income taxes	0	86,764
Subordinated debentures	907,491	728,218
Total liabilities	19,416,179	18,848,754
Stockholders' equity:
Preferred stock	0	0
Common stock	47,024	47,024
Additional paid-in capital	1,063,144	1,048,283
Retained earnings (including accumulated undistributed net income of subsidiaries of $5,068,139 and $5,073,268 at December 31, 2018 and 2017, respectively)	7,558,619	6,956,882
Accumulated other comprehensive (loss) income	(510,470)	68,541
Treasury stock, at cost	(2,720,466)	(2,709,386)
Total common stockholders’ equity	5,437,851	5,411,344
Total liabilities and equity	24,895,977	24,299,917
Fixed maturity securities available for sale at cost	13,596,057	13,242,580
Parent Company
Assets:
Cash and cash equivalents	83,950	45,062	$ 124,803		$ 195,658
Fixed maturity securities available for sale at fair value (cost $1,317,058 and $1,059,834 at December 31, 2018 and 2017, respectively)	1,307,347	1,052,240
Loans receivable	51,544	53,019
Equity securities, at fair value (cost $3,430 in 2018 and 2017)	3,430	3,430
Investment in subsidiaries	6,786,999	7,140,108
Current federal income taxes	9,068	0
Deferred federal income taxes	66,995	0
Property, furniture and equipment at cost, less accumulated depreciation	13,391	14,421
Other assets	12,340	10,819
Total assets	8,335,064	8,319,099
Liabilities:
Due to subsidiaries	116,125	232,756
Other liabilities	115,562	128,002
Current federal income taxes	0	10,486
Deferred federal income taxes	0	51,757
Subordinated debentures	907,491	728,218
Senior notes	1,758,035	1,756,536
Total liabilities	2,897,213	2,907,755
Stockholders' equity:
Preferred stock	0	0
Common stock	47,024	47,024
Additional paid-in capital	1,063,144	1,048,283
Retained earnings (including accumulated undistributed net income of subsidiaries of $5,068,139 and $5,073,268 at December 31, 2018 and 2017, respectively)	7,558,619	6,956,882
Accumulated other comprehensive (loss) income	(510,470)	68,541
Treasury stock, at cost	(2,720,466)	(2,709,386)
Total common stockholders’ equity	5,437,851	5,411,344
Total liabilities and equity	8,335,064	8,319,099
Fixed maturity securities available for sale at cost	1,317,058	1,059,834
Equity securities available for sale at cost	3,430	3,430
Accumulated undistributed net income of subsidiaries	$ 5,068,139	$ 5,073,268

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Schedule II - Condensed Financial Information of Registrant (Statements of Income (Parent Company)) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Condensed Income Statements, Captions [Line Items]
Net investment (losses) gains									$ 154,488	$ 335,858	$ 267,005
Other income									681	805	376
Total revenues	$ 1,951,586	$ 1,937,902	$ 1,910,916	$ 1,891,247	$ 1,934,956	$ 2,031,342	$ 1,848,049	$ 1,870,418	7,691,651	7,684,764	7,654,184
Operating costs and expense									6,879,557	6,911,994	6,757,746
Income before income taxes									812,094	772,770	896,438
Federal income taxes:
Net expense (benefit)									(163,028)	(219,433)	(292,953)
Net income to common stockholders	$ 132,357	$ 161,920	$ 180,075	$ 166,397	$ 154,589	$ 162,054	$ 109,004	$ 123,447	640,749	549,094	601,916
Dividends from subsidiaries									639,477	694,462	700,664
Parent Company
Condensed Income Statements, Captions [Line Items]
Management fees and investment income including dividends from subsidiaries of $639,477, $694,462 and $700,664 for the years ended December 31, 2018, 2017 and 2016, respectively									697,687	738,923	726,742
Net investment (losses) gains									(1,685)	(4,286)	909
Other income									530	805	376
Total revenues									696,532	735,442	728,027
Operating costs and expense									191,873	182,145	171,967
Interest expense									155,082	146,929	139,216
Income before income taxes									349,577	406,368	416,844
Federal income taxes:
Federal income taxes provided by subsidiaries on a separate return basis									409,439	115,597	327,520
Federal income tax expense on a consolidated return basis									(113,138)	(195,261)	(246,389)
Net expense (benefit)									296,301	(79,664)	81,131
Income before undistributed equity in net income of subsidiaries									645,878	326,704	497,975
Equity in undistributed net (loss) income of subsidiaries									(5,129)	222,390	103,941
Net income to common stockholders									$ 640,749	$ 549,094	$ 601,916

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Schedule II - Condensed Financial Information of Registrant (Statements of Cash Flows (Parent Company)) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities:
Net income	$ 132,357	$ 161,920	$ 180,075	$ 166,397	$ 154,589	$ 162,054	$ 109,004	$ 123,447	$ 640,749	$ 549,094	$ 601,916
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization									131,108	112,956	86,051
Stock incentive plans									36,591	40,490	37,174
Change in:
Other liabilities									(48,770)	66,482	46,852
Net cash from operating activities									620,199	710,883	848,376
Cash used in investing activities:
Proceeds from sale of fixed maturity securities									3,525,149	4,035,162	2,440,310
Proceeds from maturities and prepayments of fixed maturity securities									2,676,455	3,556,744	2,189,365
Proceeds from sales of equity securities									497,989	195,270	143,042
Cost of purchases of fixed maturity securities									(6,677,753)	(7,940,957)	(5,541,202)
Change in loans receivable									(13,204)	27,135	166,327
Net additions to real estate, furniture & equipment									(49,860)	(115,719)	(50,829)
Net cash used in investing activities									(714,244)	(333,464)	(794,488)
Cash (used in) from financing activities:
Purchase of common treasury shares									(24,750)	(47,807)	(132,392)
Cash dividends to common stockholders									(254,951)	(188,199)	(183,999)
Net cash used in financing activities									(7,403)	(235,086)	(6,932)
Net (decrease) increase in cash and cash equivalents									(132,869)	155,186	31,654
Cash and cash equivalents at beginning of year				950,471				795,285	950,471	795,285	763,631
Cash and cash equivalents at end of year	817,602				950,471				817,602	950,471	795,285
Parent Company
Cash flows from operating activities:
Net income									640,749	549,094	601,916
Adjustments to reconcile net income to net cash from operating activities:
Net investment losses									1,685	4,286	3,649
Depreciation and amortization									9,441	2,039	2,744
Equity in undistributed earnings of subsidiaries									5,129	(222,390)	(103,941)
Tax payments received from subsidiaries									282,084	98,313	414,386
Federal income taxes provided by subsidiaries on a separate return basis									(409,439)	(115,597)	(327,520)
Stock incentive plans									28,531	38,075	37,174
Change in:
Federal income taxes									(77,415)	2,711	44,839
Other assets									1,348	(877)	1,772
Other liabilities									109,016	18,661	(88,282)
Accrued investment income									(2,870)	(2,818)	(2,743)
Net cash from operating activities									588,259	371,497	583,994
Cash used in investing activities:
Proceeds from sale of fixed maturity securities									668,447	849,330	373,252
Proceeds from maturities and prepayments of fixed maturity securities									255,528	316,611	210,904
Cost of purchases of fixed maturity securities									(1,188,821)	(1,329,379)	(1,285,101)
Change in loans receivable									1,475	(29,600)	(23,419)
Investments in and advances to subsidiaries, net									(184,597)	(21,139)	11,471
Net additions to real estate, furniture & equipment									(264)	(1,055)	(3,042)
Net cash used in investing activities									(448,232)	(215,232)	(715,935)
Cash (used in) from financing activities:
Net proceeds from issuance of senior notes									178,562	0	386,830
Repayment of senior notes									0	0	(9,353)
Purchase of common treasury shares									(24,750)	(47,807)	(132,392)
Cash dividends to common stockholders									(254,951)	(188,199)	(183,999)
Net cash used in financing activities									(101,139)	(236,006)	61,086
Net (decrease) increase in cash and cash equivalents									38,888	(79,741)	(70,855)
Cash and cash equivalents at beginning of year				$ 45,062				$ 124,803	45,062	124,803
Cash and cash equivalents at end of year	$ 83,950				$ 45,062				$ 83,950	$ 45,062	$ 124,803

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Schedule III - Supplementary Insurance Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Supplementary Insurance Information, by Segment [Line Items]
Deferred Policy Acquisition Cost	$ 497,629	$ 507,549	$ 537,890
Reserve for Losses and Loss Expenses	11,966,448	11,670,408	11,197,195
Unearned Premiums	3,359,991	3,290,180	3,283,300
Net Premiums Earned	6,371,505	6,311,419	6,293,348
Net Investment Income	674,235	575,788	564,163
Loss and Loss Expenses	3,974,702	4,002,348	3,845,800
Amortization of Deferred Policy Acquisition Cost	915,246	1,111,489	1,155,954
Other Operating Costs and Expenses	1,467,975	1,325,443	1,239,665
Net Premiums Written	6,433,227	6,260,508	6,423,913
Operating Segments | Insurance
Supplementary Insurance Information, by Segment [Line Items]
Deferred Policy Acquisition Cost	439,945	435,967	442,317
Reserve for Losses and Loss Expenses	10,226,324	9,820,258	9,445,210
Unearned Premiums	3,131,018	3,039,343	2,975,060
Net Premiums Earned	5,864,981	5,706,443	5,618,842
Net Investment Income	518,733	436,178	431,489
Loss and Loss Expenses	3,626,924	3,516,996	3,430,139
Amortization of Deferred Policy Acquisition Cost	811,178	929,793	964,064
Other Operating Costs and Expenses	1,162,328	1,026,545	954,858
Net Premiums Written	5,952,861	5,715,871	5,743,620
Operating Segments | Reinsurance
Supplementary Insurance Information, by Segment [Line Items]
Deferred Policy Acquisition Cost	57,684	71,582	95,573
Reserve for Losses and Loss Expenses	1,740,124	1,850,150	1,751,985
Unearned Premiums	228,973	250,837	308,240
Net Premiums Earned	506,524	604,976	674,506
Net Investment Income	94,291	91,146	102,617
Loss and Loss Expenses	347,778	485,352	415,661
Amortization of Deferred Policy Acquisition Cost	104,068	181,696	191,890
Other Operating Costs and Expenses	86,826	44,349	71,305
Net Premiums Written	480,366	544,637	680,293
Corporate, other and eliminations
Supplementary Insurance Information, by Segment [Line Items]
Deferred Policy Acquisition Cost	0	0	0
Reserve for Losses and Loss Expenses	0	0	0
Unearned Premiums	0	0	0
Net Premiums Earned	0	0	0
Net Investment Income	61,211	48,464	30,057
Loss and Loss Expenses	0	0	0
Amortization of Deferred Policy Acquisition Cost	0	0	0
Other Operating Costs and Expenses	218,821	254,549	213,502
Net Premiums Written	$ 0	$ 0	$ 0

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Schedule IV - Reinsurance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Direct Amount	$ 6,973,216	$ 6,726,029	$ 6,647,600
Ceded to Other Companies	1,269,267	1,216,455	1,119,788
Assumed from Other Companies	729,278	750,934	896,101
Total net premiums written	$ 6,433,227	$ 6,260,508	$ 6,423,913
Percentage of Amount Assumed to Net	11.30%	12.00%	13.90%
Insurance
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Direct Amount	$ 6,959,830	$ 6,707,916	$ 6,634,540
Ceded to Other Companies	1,204,509	1,153,960	1,051,887
Assumed from Other Companies	197,540	161,915	160,967
Total net premiums written	$ 5,952,861	$ 5,715,871	$ 5,743,620
Percentage of Amount Assumed to Net	3.30%	2.80%	2.80%
Reinsurance
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Direct Amount	$ 13,386	$ 18,113	$ 13,060
Ceded to Other Companies	64,758	62,495	67,901
Assumed from Other Companies	531,738	589,019	735,134
Total net premiums written	$ 480,366	$ 544,637	$ 680,293
Percentage of Amount Assumed to Net	110.70%	108.10%	108.10%

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Schedule V - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Premiums and fees receivable
Movement in Valuation Allowances and Reserves [Roll Forward]
Opening Balance	$ 39,926	$ 26,569	$ 22,524
Additions - Charged to Expense	6,985	20,720	10,006
Deductions - Amounts Written Off	(7,817)	(7,363)	(5,961)
Ending Balance	39,093	39,926	26,569
Due from reinsurers
Movement in Valuation Allowances and Reserves [Roll Forward]
Opening Balance	1,010	1,049	1,020
Additions - Charged to Expense	65	(29)	20
Deductions - Amounts Written Off	(128)	(10)	9
Ending Balance	947	1,010	1,049
Deferred federal and foreign income taxes
Movement in Valuation Allowances and Reserves [Roll Forward]
Opening Balance	16,619	5,457	4,037
Additions - Charged to Expense	18,772	12,663	1,420
Deductions - Amounts Written Off	(196)	(1,501)	0
Ending Balance	35,195	16,619	5,457
Loan loss reserves
Movement in Valuation Allowances and Reserves [Roll Forward]
Opening Balance	3,383	3,397	2,094
Additions - Charged to Expense	0	(14)	1,303
Deductions - Amounts Written Off	0	0	0
Ending Balance	3,383	3,383	3,397
General Valuation Allowance
Movement in Valuation Allowances and Reserves [Roll Forward]
Opening Balance	60,938	36,472	29,675
Additions - Charged to Expense	25,822	33,340	12,749
Deductions - Amounts Written Off	(8,141)	(8,874)	(5,952)
Ending Balance	$ 78,618	$ 60,938	$ 36,472

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Schedule VI - Supplementary Information Concerning Property-Casualty Insurance Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Supplemental Information for Property, Casualty Insurance Underwriters [Abstract]
Deferred policy acquisition costs	$ 497,629	$ 507,549	$ 537,890
Reserves for losses and loss expenses	11,966,448	11,670,408	11,197,195
Unearned premiums	3,359,991	3,290,180	3,283,300
Net premiums earned	6,371,505	6,311,419	6,293,348
Net investment income	674,235	575,788	564,163
Losses and loss expenses incurred:
Current year	3,926,489	3,963,543	3,826,620
Prior years	6,831	(5,165)	(29,904)
Loss reserve discount accretion	41,382	43,970	49,084
Amortization of deferred policy acquisition costs	915,246	1,111,489	1,155,954
Paid losses and loss expenses	3,664,885	3,589,955	3,454,174
Net premiums written	$ 6,433,227	$ 6,260,508	$ 6,423,913

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Subsequent Event (Details)	Feb. 21, 2019
Subsequent Event
Subsequent Event [Line Items]
Conversion ratio	1.5