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, 2015

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

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 SNo 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 and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).  Yes 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 Annual Report on Form 10-K or any amendment to this Annual Report on Form 10-K. S

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

Large accelerated filer S		Accelerated filer o
Non-accelerated filer o	(Do not check if a smaller reporting company)	Smaller reporting company 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 $5,048,029,512.

Number of shares of common stock, $.20 par value, outstanding as of February 17, 2016: 122,586,752

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, 2015, are incorporated herein by reference in Part III.

			Page
SAFE HARBOR STATEMENT
	PART I
ITEM	1.	BUSINESS	1
ITEM	1A.	RISK FACTORS	20
ITEM	1B.	UNRESOLVED STAFF COMMENTS	27
ITEM	2.	PROPERTIES	28
ITEM	3.	LEGAL PROCEEDINGS	28
ITEM	4.	MINE SAFETY DISCLOSURES	28
	PART II
ITEM	5.	MARKET FOR REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES	29
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	89
ITEM	9A.	CONTROLS AND PROCEDURES	90
ITEM	9B.	OTHER INFORMATION	93
	PART III
ITEM	10.	DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE	93
ITEM	11.	EXECUTIVE COMPENSATION	93
ITEM	12.	SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS	93
ITEM	13.	CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE	93
ITEM	14.	PRINCIPAL ACCOUNTING FEES AND SERVICES	93
	PART IV
ITEM	15.	EXHIBITS, FINANCIAL STATEMENT SCHEDULES	93
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 2016 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;

• 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 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 data security;

• 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 2016 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. It operates in the following segments of the property casualty insurance business:

• Insurance-Domestic - commercial insurance business, including excess and surplus lines and admitted lines, primarily throughout the United States;

• Insurance-International - insurance business primarily in the United Kingdom, Continental Europe, South America, Canada, Scandinavia, Asia, and Australia; and

• Reinsurance-Global - 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.

Each of our three business segments is composed of individual operating units that serve a market defined by geography, products, services or types of customers. Each of our operating units is positioned close to its customer base and participates in a niche market requiring specialized knowledge about a territory or product. This strategy of decentralized operations allows each of our units to identify and respond quickly and effectively to changing market conditions and local 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 51 operating units, 44 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)	2015		2014		2013		2012		2011
Net premiums written:
Insurance-Domestic	$	4,812,830	$	4,517,587	$	3,994,387	$	3,569,883	$	3,238,120
Insurance-International	778,567		828,076		756,185		664,459		551,910
Reinsurance-Global	598,118		651,284		749,601		664,197		567,338
Total	$	6,189,515	$	5,996,947	$	5,500,173	$	4,898,539	$	4,357,368

	Year Ended December 31,
	2015		2014		2013		2012		2011
Percentage of net premiums written:
Insurance-Domestic	77.7	%	75.3	%	72.6	%	72.8	%	74.3	%
Insurance-International	12.6		13.8		13.8		13.6		12.7
Reinsurance-Global	9.7		10.9		13.6		13.6		13.0
Total	100.0	%	100.0	%	100.0	%	100.0	%	100.0	%

Twenty-seven of our twenty-eight insurance company subsidiaries rated by A.M. Best Company, Inc. (“A.M. Best”) have ratings of A+ (Superior) (the second highest rating out of 15 possible ratings), and one is rated A (Excellent) (the third highest rating). 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.

The twenty-four 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 A2 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. Certain operating units are identified by us herein for descriptive purposes only and are not legal entities. Unless otherwise indicated, all references in this Form 10-K to “W. R. 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-Domestic

The Insurance-Domestic operating units 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 Insurance-Domestic operating units are dedicated to the 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. 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 in this segment 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. Independent agents and brokers are the primary means of distribution.

Regional: Certain Insurance-Domestic operating units offer standard insurance products and services through operating units focused on meeting the specific needs of a regionally 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 drive local communities. They are organized geographically in order to provide them with the flexibility to adapt quickly to local market conditions and customer needs. Business is sold through non-exclusive independent agents who are compensated on a commission basis.

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-Domestic 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 businesses and industries such as construction, lumber and fishing.

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 offers workers' compensation insurance as well as general liability, automobile, and excess liability coverages to a broad range of firms within the mining and aggregate industries in the United 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.

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.     

2

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. In addition to professional liability, the Berkley Construction Professional division provides pollution liability and protective coverages to contractors and owners across all forms of non-environmental construction.

Berkley Aviation offers a wide range of aviation insurance products on a global basis, including coverage for airlines, airplanes, helicopters, miscellaneous general aviation operations, non-owned aircraft, fixed-base operations, control towers, airports and other specialized niche programs. In the U.S., it places its business on an admitted and non-admitted basis nationwide.

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 FinSecure serves the insurance needs of financial institutions, credit unions, mortgage lenders, mortgage servicers and trust managers. It offers a comprehensive range of property, casualty, professional liability, and specialty lines insurance products and loss control services, including financial institution-specific commercial package policies, workers' compensation, umbrella, commercial auto, management liability and crime coverages, and financial institution bonds.

Berkley Fire & Marine offers a broad range of preferred inland marine and related property risks and services to  customers throughout the United States, both regionally and nationwide.  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 Professional provides customized, comprehensive professional liability solutions for the full spectrum of healthcare providers.

Berkley Life Sciences offers a comprehensive spectrum of property casualty products to the life sciences industry on a global basis, including primary and excess liability coverage and commercial insurance. It serves pharmaceutical and biologic/biotech companies, medical device companies, dietary supplement manufacturers, medical and research software developers, contract service organizations, research institutions and organizations, and other related businesses.

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 W. R. Berkley Corporation member companies.

Berkley North Pacific provides local underwriting, claims and risk management services from its home office in Seattle, Washington and branch offices in Boise, Idaho, Spokane, Washington and Salt Lake City, Utah. 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.

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 any size 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 Professional Liability specializes in professional liability insurance for publicly-traded and private entities based on a worldwide basis. Its liability coverages include directors and officers, fiduciary, employment practices, and sponsored insurance agents.

Berkley Program Specialists is a program management company offering both admitted and non-admitted insurance support on a nationwide basis for commercial casualty and inland marine 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.    

3

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 Regional Specialty 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 W. R. Berkley Corporation member company agents.

Berkley Risk Administrators provides insurance program management services to a variety of organizations, including self-insureds, captives, governmental entities, risk retention groups, and insurance companies. It is also a nationwide third-party claims administrator and is the nation's third largest servicing carrier for workers' compensation assigned risk plans, serving plans in 20 states.

Berkley Select specializes in underwriting professional liability insurance with a particular emphasis on large law firms, accounting firms and medical institution facilities. Its products are distributed nationwide through a limited number of brokers.    

Berkley Southeast offers a wide array of commercial lines products in six southeastern states: Alabama, Georgia, Mississippi, North Carolina, South Carolina and Tennessee.

Berkley Specialty Underwriting Managers has two underwriting divisions. Its entertainment and sports division underwrites property casualty insurance products, both on an admitted and non-admitted basis, for the entertainment industry and sports-related organizations. The environmental division underwrites specialty insurance products for environmental customers such as contractors, consultants and owners of sites and facilities.

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 16 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 Insurance provides commercial insurance products and services to the transportation industry with an emphasis on intermediate and long-haul trucking and various classes of business and public automobile coverage. It underwrites on an admitted basis in all 50 states and the District of Columbia.

Clermont Specialty Managers provides 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.    

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, public entity and implement dealers.

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.

Key Risk Insurance is a provider of workers' compensation insurance products and services for employers in the public and private sectors in select Eastern and Southeastern states. It focuses on middle-market accounts in specialty niches and on larger self-insured entities, with a special emphasis on expert claims and managed-care services. Additionally, Key Risk's affiliate, Key Risk Management Services, provides third party administration of self-insured workers' compensation programs.    

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, large deductible policies and reinsurance. 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.

Monitor Liability Managers provides executive and professional liability insurance to small to middle-market risks on a nationwide basis. Its primary professional liability products are management liability, employment practices and fiduciary coverages for private companies and nonprofit organizations, and errors and omissions policies for accounting and law firms.    

4

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.    

Riverport Insurance Services provides property casualty insurance coverages to human services organizations, including nonprofit and for-profit organizations, public schools and sports and recreational organizations. Riverport also insures 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 own risk.

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. Union Standard's strategy is built around relationships and service.

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.

5

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

	Year Ended December 31,
	2015		2014		2013		2012		2011
Acadia Insurance	7.8	%	8.4	%	8.2	%	8.6	%	9.0	%
Admiral Insurance	5.7		6.2		5.9		6.1		6.8
American Mining Insurance	0.9		0.8		0.8		0.9		1.0
Berkley Accident and Health	4.3		3.4		3.0		3.6		3.3
Berkley Agribusiness Risk Specialists	1.0		1.1		—		—		—
Berkley Alliance Managers	0.8		0.1		—		—		—
Berkley Aviation	1.4		1.0		1.0		1.5		1.7
Berkley Custom Insurance	3.3		2.8		2.8		0.7		—
Berkley FinSecure	1.2		0.8		0.9		0.8		0.8
Berkley Fire and Marine	0.4		0.2		—		—		—
Berkley Global Product Recall Managers	—		—		—		—		—
Berkley Healthcare Professional	0.2		0.2		—		—		—
Berkley Life Sciences	0.9		1.1		1.1		0.8		0.6
Berkley Medical Excess	0.9		0.8		0.9		0.9		1.0
Berkley Mid-Atlantic Group	2.1		2.8		4.4		4.9		5.4
Berkley Net Underwriters	4.6		4.3		4.0		3.5		2.5
Berkley North Pacific	1.9		1.9		1.8		1.8		1.5
Berkley Offshore Underwriting Managers	1.6		2.0		2.3		2.2		2.0
Berkley Oil & Gas	3.7		4.1		3.9		3.2		2.2
Berkley Professional Liability	2.0		2.1		1.3		1.2		1.1
Berkley Program Specialists	1.4		1.4		1.5		1.8		3.1
Berkley Public Entity	0.5		0.4		0.4		0.2		—
Berkley Regional Specialty	0.4		0.4		0.4		0.4		0.4
Berkley Risk Administrators	4.6		4.6		4.9		4.8		4.0
Berkley Select	1.8		2.1		2.7		2.9		2.6
Berkley Southeast	2.7		3.0		—		—		—
Berkley Specialty Underwriting Managers	6.6		6.2		6.6		7.9		7.0
Berkley Surety	1.4		1.4		1.3		1.3		1.6
Berkley Technology Underwriters	0.6		0.5		0.3		0.1		—
Carolina Casualty Insurance	1.4		2.2		2.4		2.3		2.3
Clermont Specialty Managers	1.5		1.5		1.5		1.6		1.7
Continental Western Group	4.6		4.5		5.9		6.4		7.0
Gemini Transportation	1.3		1.1		1.0		1.1		1.0
Key Risk Insurance	3.3		3.5		3.3		3.2		3.1
Midwest Employers Casualty	2.8		2.9		2.9		3.4		4.4
Monitor Liability Managers	2.8		2.6		3.1		3.1		3.9
Nautilus Insurance Group	5.5		5.5		5.8		6.2		6.6
Preferred Employers Insurance	2.8		2.5		2.1		2.0		1.9
Riverport Insurances Services	0.7		0.7		0.8		1.4		1.7
Union Standard	3.0		3.1		5.2		5.3		5.5
Vela Insurance Services	3.9		3.7		3.5		2.2		2.1
Verus Underwriting Managers	1.0		0.9		1.0		0.7		0.4
Other	0.7		1.2		1.1		1.0		0.8
Total	100.0	%	100.0	%	100.0	%	100.0	%	100.0	%

6

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

	Year Ended December 31,
	2015		2014		2013		2012		2011
Other liability	31.8	%	31.9	%	32.4	%	30.7	%	31.2	%
Workers' compensation	27.9		27.2		27.0		26.8		25.3
Short-tail lines (1)	21.2		21.8		22.0		23.5		23.5
Commercial auto	9.7		10.4		10.7		11.2		12.1
Professional liability	9.4		8.7		7.9		7.8		7.9
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.

Insurance-International

Through our Insurance-International operating units, we write business in more than 60 countries worldwide, with branches or offices in 19 locations outside the United States, including the United Kingdom, Continental Europe, South America, Canada, 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.

Operating units comprising the Insurance-International Segment are as follows:    

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 and life sciences.

Berkley Latinoamérica is a leading provider of property, casualty, automobile, surety, group life and health and workers' compensation products and services in its operating territories of Argentina, Brazil, Colombia and Uruguay. Its largest operation, Berkley International Seguros, offers a wide range of property casualty products in Argentina, where it is a leading provider of surety, engineering, cargo and personal accident coverages. Berkley International ART, Berkley Latinoamérica's workers' compensation carrier in Argentina, is focused on small to medium-sized risks in its operating territories. Berkley International Seguros do Brasil provides surety products to small and medium-sized risks throughout Brazil. Berkley International Seguros Uruguay and Berkley International Seguros Colombia are providers of customized property casualty insurance products and services to small and medium-sized businesses in Uruguay and Colombia, respectively.

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.

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

W. R. Berkley Insurance Asia is expected to commence operations in 2016 and intends to underwrite general insurance business in Asia, including professional liability, specialty casualty, accident and marine business for companies of all sizes.

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

W / R / B Underwriting provides a broad range of leading insurance products to the European marketplace, with a concentration in specialist classes of business including property, marine, professional indemnity, crisis management, aviation, personal accident and asset protection. The unit was established in 2015 by combining W. R. Berkley Syndicate 1967 with the U.K. and Irish branches of W. R. Berkley Insurance (Europe) Limited under a single brand.

7

The following table sets forth the percentages of gross premiums written by our Insurance-International operating units:

	Year Ended December 31,
	2015		2014		2013		2012		2011
Berkley Canada	4.5	%	3.4	%	4.4	%	4.6	%	4.9	%
Berkley Latinoamérica	33.6		29.5		32.6		34.8		38.3
W. R. Berkley Europe	13.5		15.4		15.9		15.5		13.1
W. R. Berkley Insurance Australia	5.7		8.3		8.6		5.3		4.1
W / R / B Underwriting	38.9		39.4		38.5		39.7		39.6
Lloyd's Syndicate 2791 Participation	3.8		4.0		—		0.1		—
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-International operations:

	Year Ended December 31,
	2015		2014		2013		2012		2011
Short-tail lines (1)	50.1	%	55.1	%	51.8	%	49.4	%	41.4	%
Commercial auto	15.0		13.1		15.5		18.0		19.8
Professional liability	9.5		12.8		12.9		15.1		17.6
Other liability	15.2		11.7		10.4		7.2		10.3
Workers' compensation	10.2		7.3		9.4		10.3		10.9
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-Global

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-Global 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, Sydney, 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 Direct 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. Berkley Re Direct also provides its customers value-added services across its lines, including 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.

8

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

	Year Ended December 31,
	2015		2014		2013		2012		2011
Berkley Re America	64.2	%	60.4	%	52.2	%	54.3	%	57.8	%
Berkley Re Asia Pacific	16.4		21.2		24.9		22.1		24.4
Berkley Re Direct	8.6		7.2		6.5		6.2		7.2
Berkley Re UK	10.8		11.2		9.1		6.9		0.2
Other	—		—		7.3		10.5		10.4
Total	100.0	%	100.0	%	100.0	%	100.0	%	100.0	%

_________________________

The following table sets forth the percentages of gross premiums written, by property versus casualty business, by our Reinsurance-Global operations:

	Year Ended December 31,
	2015		2014		2013		2012		2011
Casualty	66.7	%	66.9	%	65.6	%	66.9	%	70.7	%
Property	33.3		33.1		34.4		33.1		29.3
Total	100.0	%	100.0	%	100.0	%	100.0	%	100.0	%

Results by Industry Segment

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

	Year Ended December 31,
(In thousands)	2015			2014		2013			2012			2011
Insurance-Domestic
Revenue	$5,114,781			$4,807,418		$4,294,213			$3,944,942			$3,586,181
Income before income taxes	724,667			796,309		648,740			578,500			467,126
Insurance-International
Revenue	823,663			857,782		770,190			677,637			545,467
Income before income taxes	51,926			29,779		56,922			51,639			36,912
Reinsurance-Global
Revenue	683,335			758,931		810,060			731,585			628,872
Income before income taxes	94,852			115,677		110,425			103,690			85,271
Other(1)
Revenue	584,678			704,797		534,071			469,390			395,464
Income (loss) before income taxes	(139,415		)	10,431		(117,199		)	(31,901		)	(76,223		)
Total
Revenue	7,206,457			7,128,928		6,408,534			5,823,554			5,155,984
Income before income taxes	$	732,030		$	952,196	$	698,888		$	701,928		$	513,086

_______________________________________

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

9

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,
	2015		2014		2013		2012		2011
Insurance-Domestic
Loss ratio	61.2	%	60.2	%	61.3	%	63.5	%	64.9	%
Expense ratio	31.2		31.6		32.7		32.5		32.6
Combined ratio	92.4	%	91.8	%	94.0	%	96.0	%	97.5	%
Insurance-International
Loss ratio	58.2	%	62.8	%	59.4	%	59.7	%	57.4	%
Expense ratio	41.4		40.0		39.0		40.2		42.7
Combined ratio	99.6	%	102.8	%	98.4	%	99.9	%	100.1	%
Reinsurance-Global
Loss ratio	58.4	%	62.0	%	62.2	%	64.3	%	64.3	%
Expense ratio	38.2		34.0		34.8		36.3		38.0
Combined ratio	96.6	%	96.0	%	97.0	%	100.6	%	102.3	%
Total
Loss ratio	60.5	%	60.8	%	61.2	%	63.1	%	63.9	%
Expense ratio	33.2		33.0		33.9		34.1		34.6
Combined ratio	93.7	%	93.8	%	95.1	%	97.2	%	98.5	%

Investments

Investment results, before income taxes, were as follows:

	Year Ended December 31,
(In thousands)	2015			2014			2013			2012			2011
Average investments, at cost(1)	$	15,970,931		$	15,560,335		$	14,848,386		$	14,545,371		$	13,631,552
Net investment income(1)	$	512,645		$	600,885		$	544,291		$	586,763		$	526,351
Percent earned on average investments(1)	3.2		%	3.9		%	3.7		%	4.0		%	3.9		%
Net investment gains (2)	$	92,324		$	254,852		$	121,544		$	10,465		$	125,481
Change in unrealized investment gains (losses) (3)	$	(192,186	)	$	72,889		$	(399,122	)	$	135,282		$	147,998

_______________________________________

(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.

(3) Represents the change in unrealized investment gains (losses) for available for sale securities.

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,
	2015		2014		2013		2012		2011
Barclays U.S. Aggregate Bond Index	3.0	%	3.2	%	3.1	%	3.5	%	4.0	%
S&P 500® Index	2.1		2.1		2.4		2.5		2.1

10

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,
	2015		2014		2013		2012		2011
1 year or less	5.8	%	7.0	%	8.0	%	5.8	%	6.6	%
Over 1 year through 5 years	33.6		32.4		30.5		30.7		28.3
Over 5 years through 10 years	30.5		29.8		27.5		23.4		25.3
Over 10 years	20.3		20.4		22.3		25.5		25.5
Mortgage-backed securities	9.8		10.4		11.7		14.6		14.3
Total	100.0	%	100.0	%	100.0	%	100.0	%	100.0	%

At December 31, 2015, the fixed maturity portfolio had an effective duration of 3.3 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

11

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.

The Company discounts its liabilities for certain workers’ compensation reserves. The amount of workers’ compensation reserves that were discounted was $2,308 million and $2,187 million at December 31, 2015 and 2014, respectively. The aggregate net discount for those reserves, after reflecting the effects of ceded reinsurance, was $699 million and $746 million at December 31, 2015 and 2014, respectively. At December 31, 2015, discount rates by year ranged from 2.0% to 6.5%, with a weighted average discount rate of 3.9%.

Substantially all of discounted workers’ compensation reserves (98% of total discounted reserves at December 31, 2015) 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 2% of total discounted reserves at December 31, 2015), 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 was $33 million at December 31, 2015 and $36 million at December 31, 2014. The Company’s gross reserves for losses and loss expenses relating to asbestos and environmental claims were $51 million and $56 million at December 31, 2015 and 2014, respectively. Net incurred losses and loss expenses for reported asbestos and environmental claims decreased approximately $2 million in 2015 and increased by approximately $4 million and $5 million in 2014 and 2013, respectively. Net paid losses and loss expenses for asbestos and environmental claims were approximately $2 million in 2015, $3 million in 2014 and $3 million in 2013. 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.

12

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

(In thousands)	2015			2014			2013
Net reserves at beginning of year	$	8,970,641		$	8,683,797		$	8,411,851
Net provision for losses and loss expenses:
Claims occurring during the current year (1)	3,653,561			3,495,825			3,221,393
Decrease in estimates for claims occurring in prior years (2)(3)	(46,713		)	(75,764		)	(78,810		)
Loss reserve discount amortization (4)	49,422			70,506			54,441
Total	3,656,270			3,490,567			3,197,024
Net payments for claims:
Current year	914,637			898,944			822,787
Prior years	2,342,378			2,216,283			2,055,284
Total	3,257,015			3,115,227			2,878,071
Foreign currency translation	(125,024		)	(88,496		)	(47,007		)
Net reserves at end of year	9,244,872			8,970,641			8,683,797
Ceded reserves at end of year	1,424,278			1,399,060			1,397,144
Gross reserves at end of year	$	10,669,150		$	10,369,701		$	10,080,941
Net change in premiums and losses occurring in prior years:
Decrease in estimates for claims occurring in prior years (2)	$	46,713		$	75,764		$	78,810
Retrospective premium adjustments for claims occurring in prior years (3)	16,730			9,088			19,046
Net favorable premium and reserve development on prior years	$	63,443		$	84,852		$	97,856

____________________________________

(1) Claims occurring during the current year are net of discounts of $20,357,000, $21,306,000 and $22,680,000 in 2015, 2014 and 2013, respectively.

(2) The decrease in estimates for claims occurring in prior years is net of discounts. On an undiscounted basis, the estimates for claims occurring in prior years decreased by $64,971,000 in 2015, $116,866,000 in 2014 and $77,430,000 in 2013.

(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.

(4) In 2014, the Company entered into a commutation agreement that resulted in a reduction in prior year workers' compensation reserves of $30 million on an undiscounted basis and $12 million on a discounted basis.

Also, see Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations” for further information regarding the decrease in estimates for claims occurring in prior years.

A reconciliation between the reserves as of December 31, 2015 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	$	8,760,986
Reserves for non-U.S. companies	649,117
Loss reserve discounting(1)	(165,231		)
Ceded reserves	1,424,278
Gross reserves reported in the consolidated GAAP financial statements	$	10,669,150

_________________________

(1) For statutory purposes, the Company discounts its workers’ compensation reinsurance reserves at 2.7% as 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.

13

The following table presents the development of net reserves for 2005 through 2015. The top line of the table shows the estimated reserves for unpaid losses and loss expenses recorded at the balance sheet date for each of the indicated years. This represents the estimated amount of losses and loss expenses for claims arising in all prior years that are unpaid at the balance sheet date, including losses that had been incurred but not reported to us. The upper portion of the table shows the re-estimated amount of the previously recorded reserves based on experience as of the end of each succeeding year. The estimate changes as more information becomes known about the frequency and severity of claims for individual years.

The “cumulative redundancy” represents the aggregate change in the estimates over all prior years. The impact on the results of operations of the past three years of changes in reserve estimates is shown in the reconciliation tables above. It should be noted that the table presents a “run off” of balance sheet reserves, rather than accident or policy year loss development. Therefore, each amount in the table includes the effects of changes in reserves for all prior years. For example, assume a claim that occurred in 2005 is reserved for $2,000 million as of December 31, 2005. Assuming this claim estimate was changed in 2015 to $2,300 million, and was settled for $2,300 million in 2015, the $300 million deficiency would appear as a deficiency in each year from 2005 through 2015.

(In millions)
Year Ended December 31,	2005			2006		2007		2008		2009		2010		2011		2012		2013		2014		2015
Net reserves, discounted	$	5,867		$	6,948	$	7,823	$	8,123	$	8,148	$	8,000	$	8,172	$	8,412	$	8,684	$	8,971	$	9,245
Reserve discount	575			700		788		846		877		898		892		867		837		746		699
Net reserves, undiscounted	$	6,442		$	7,648	$	8,611	$	8,969	$	9,025	$	8,898	$	9,064	$	9,279	$	9,521	$	9,717	$	9,944
Net reserves re-estimated as of:
One year later	$	6,499		$	7,560	$	8,431	$	8,737	$	8,778	$	8,715	$	8,963	$	9,202	9,404		9,652
Two years later	6,578			7,494		8,239		8,560		8,596		8,624		8,866		9,140		9,345
Three years later	6,592			7,363		8,192		8,420		8,543		8,504		8,772		9,085
Four years later	6,556			7,370		8,137		8,433		8,460		8,400		8,722
Five years later	6,636			7,376		8,195		8,373		8,388		8,356
Six years later	6,677			7,437		8,144		8,343		8,355
Seven years later	6,755			7,421		8,135		8,326
Eight years later	6,762			7,428		8,120
Nine years later	6,780			7,418
Ten years later	6,763
Cumulative redundancy (deficiency), undiscounted	$	(321	)	$	230	$	491	$	643	$	670	$	542	$	342	$	194	$	176	$	65	$	—
Cumulative amount of net liability paid through:
One year later	$	1,341		$	1,437	$	1,663	$	1,751	$	1,812	$	1,722	$	2,010	$	2,055	$	2,216	$	2,342
Two years later	2,363			2,636		2,935		3,106		3,052		3,118		3,409		3,598		3,778
Three years later	3,219			3,558		3,956		4,039		4,066		4,105		4,495		4,702
Four years later	3,856			4,279		4,616		4,786		4,802		4,896		5,298
Five years later	4,327			4,733		5,152		5,337		5,413		5,478
Six years later	4,649			5,116		5,565		5,815		5,874
Seven years later	4,937			5,424		5,943		6,183
Eight years later	5,163			5,719		6,241
Nine years later	5,392			5,962
Ten years later	5,576

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. Such premiums are not reflected in the above table.

14

The following table presents the development of gross reserves for 2005 through 2015.

(In millions)
Year Ended December 31,	2005			2006		2007		2008		2009		2010		2011		2012		2013		2014		2015
Net reserves, discounted	$	5,867		$	6,947	$	7,823	$	8,123	$	8,148	$	8,000	$	8,172	$	8,412	$	8,684	$	8,971	$	9,245
Ceded reserves	845			837		855		877		924		1,017		1,165		1,339		1,397		1,399		1,424
Gross reserves, discounted	6,712			7,784		8,678		9,000		9,072		9,017		9,337		9,751		10,081		10,370		10,669
Reserve discount	654			761		867		944		944		968		953		924		888		811		759
Gross reserves, undiscounted	$	7,366		$	8,545	$	9,545	$	9,944	$	10,016	$	9,985	$	10,290	$	10,675	$	10,969	$	11,181	$	11,428
Gross reserves re-estimated as of:
One year later	$	7,406		$	8,509	$	9,396	$	9,696	$	9,810	$	9,879	$	10,179	$	10,673	$	10,823	$	11,081
Two years later	7,529			8,454		9,178		9,566		9,662		9,749		10,141		10,573		10,732
Three years later	7,561			8,300		9,163		9,445		9,580		9,681		10,029		10,479
Four years later	7,508			8,335		9,081		9,427		9,539		9,540		9,947
Five years later	7,617			8,316		9,109		9,386		9,433		9,477
Six years later	7,635			8,360		9,082		9,310		9,384
Seven years later	7,699			8,358		9,029		9,267
Eight years later	7,716			8,315		8,988
Nine years later	7,694			8,275
Ten Years later	7,652
Gross cumulative redundancy (deficiency)	$	(286	)	$	270	$	557	$	677	$	632	$	508	$	343	$	196	$	237	100		—

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. Such premiums are not reflected in the above table.

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

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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, effective 2015, 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.

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. National standard setters, such as the International Association of Insurance Supervisors, are developing capital standards for international groups, and U.S. insurance regulators are currently working on U.S. group capital standards for insurance groups. 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.

The National Association of Insurance Commissioners (“NAIC”) adopted the Risk Management and Own Risk Solvency Assessment Model Act (the “ORSA Model Act”). Most states have adopted 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

• provide a confidential high-level ORSA Summary Report annually to the lead state commissioner if the insurer is a member of an insurance group and, upon request, by the domiciliary state regulator.

We cannot predict the impact, if any, that these holding company statutes and compliance with the ORSA Model Act 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, 2015. 

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 liquidated 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 Model Post-Assessment Guaranty Fund 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. 

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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.

 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 84% 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, beginning in 2016. The insurer's deductible is based on 20% percent of earned premium for the prior year for covered lines of commercial property and casualty insurance. Based on our 2015 earned premiums, our aggregate deductible under TRIPRA during 2016 will be approximately $850 million. The federal program will not pay losses for certified acts unless such losses exceed $100 million industry-wide. This threshold will increase to $200 million on a pro-rata basis over five years beginning 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. In July 2010, President Obama signed into law the Dodd-Frank Wall Street Reform and Consumer Protection Act (the “Dodd-Frank Act”), which 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.

The FIO has a particular role in connection with international insurance matters. The FIO represents the U.S. at the International Association of Insurance Supervisors (“IAIS”); in 2012, the FIO participated in IAIS’s Financial Stability Committee and joined IAIS’s Executive Committee. 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”). On November 20, 2015, the FIO and the U.S. Trade Representative advised Congress that they intend to initiate negotiations to enter into a Covered Agreement with the European Union. We are monitoring public reports on these negotiations which may affect our U.S. and EU domiciled insurance and reinsurance

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business. Significantly, the FIO is authorized to preempt state measures that (i) are inconsistent with a Covered Agreement and (ii) disfavor non-U.S. insurers subject to a Covered Agreement.

The FIO is required to report to Congress annually on the insurance industry and any preemption actions regarding any Covered Agreement.

On December 12, 2013, the FIO delivered a report to Congress on how to modernize and improve the system of insurance regulation in the U.S. The report recommended that, in the short term, the U.S. system of insurance regulation can be modernized through state-based improvements combined with certain federal actions. The report identified areas for direct federal involvement in international standard setting, the FIO participation in supervisory colleges which monitor the regulation of large national and internationally active insurance groups and federal pursuit of international covered agreements to afford nationally uniform treatment of reinsurance collateral requirements. The report also made several recommendations for state reform of insurance regulation including changes to the state regulation of insurance company solvency, group supervision and corporate governance. The FIO report stated that the system of U.S. insurance regulation can be modernized and improved in the short-term, while warning that if the states do not act in the near term to effectively regulate matters on a consistent and cooperative basis, in the FIO’s view there will be a greater role for federal regulation of insurance.

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, 2015, three insurance groups had been so designated. 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 on the U. S. insurance industry is 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 significant non-bank financial companies.

International Regulation

Our insurance subsidiaries based in the United Kingdom are regulated by the Prudential Regulation Authority ("PRA") and 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. Our Lloyd's managing agency is also 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. Additionally, PRA and FCA regulations also impact us as “controller” (a PRA/FCA defined term) of our U.K.-regulated subsidiaries, whereby we are required to notify the PRA/FCA about significant events relating to the U.K.-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 an annual report regarding their controllers. As well, the PRA/FCA's Senior Insurance Managers Regime provides a regulatory framework for standards of fitness and propriety, conduct and accountability to be applied to individuals in positions of responsibility at insurers. In addition, certain employees are individually registered at Lloyd's.

In the European Union, a new insurance regulatory regime governing, among other things, capital adequacy and risk management called “Solvency II” 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 one-year 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.

Our international underwriting subsidiaries are also subject to varying degrees of regulation in certain countries in Scandinavia, Continental Europe, South America, Australia, Southeast Asia and Canada. 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

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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 insurance subsidiaries can gain a competitive advantage by responding quickly to changing market conditions. Our subsidiaries establish their own pricing practices based upon a Company-wide philosophy to price products with the intent of making an underwriting profit. Although insurance prices have generally increased for most lines of business since 2011, the rate of increase has declined in more recent years. 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 the Company to achieve its long-term return objectives.

Competition for Insurance-Domestic business 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-International operations compete 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-Global 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.

Additionally, competition from insurers and reinsurers based in tax-advantaged jurisdictions continues to increase, including from domestic based subsidiaries of foreign-based entities in the excess and surplus lines businesses.

Employees

 As of January 30, 2016, we employed 7,621 individuals. Of this number, our subsidiaries employed 7,481 persons and the remaining persons were employed at the parent company.

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 insurance subsidiaries develop new coverages or 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 subsidiaries. Although the effect on our business of catastrophes such as tornadoes, hurricanes, hailstorms, 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 which 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

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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.

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 increased competition in our business, as a result of new entrants and existing insurers seeking to gain market share, resulting in decreased premium rates and less favorable contract terms and conditions for certain lines of business. 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 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 reduced 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-Global 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. Certain of our competitors operate from Bermuda or other tax advantaged or less regulated jurisdictions that may provide them with additional competitive and pricing advantages.

Over the past several years, we have faced increased competition in our business, as increased supply has led to reduced prices and, at times, less favorable terms and conditions. Our specialty 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 has declined in more recent years. 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 could experience renewed pressure on pricing and policy terms and conditions.

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.  

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

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terms 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 $10.7 billion as of December 31, 2015. 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 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;

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

• claims relating to unanticipated consequences of current or new technologies, including cyber security related risks;

and

• claims relating to potentially changing climate conditions.

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.

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

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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 were $58 million in 2015, $87 million in 2014, $65 million in 2013, $80 million in 2012 and $153 million in 2011. 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 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 adversely affect our financial condition or profitability.    

There is an emerging scientific view that the earth is getting warmer. Climate change, to the extent it produces rising temperatures and changes in weather patterns, may affect the frequency and severity of storms and other weather events as well as the affordability, availability and underwriting results of commercial property insurance, and, if frequency and severity patterns increase, could negatively affect our financial results.

Conditions in the financial markets and the global economy have had and may continue to have a negative impact on our results of operations and financial condition, particularly if such conditions continue.

The significant volatility and uncertainty experienced in financial markets around the world during the past several years and the effect of the economic downturn have continued. Although the U.S. and various foreign governments have taken various actions to try to stabilize the financial markets, the ultimate effectiveness of such actions remains unclear. Therefore, volatility and uncertainty in the financial markets and the resulting negative economic impact may continue for some time. For example, financial markets have been affected by concerns over U.S. fiscal policy as well as the related concern regarding the need to reduce the federal deficit. These issues, together with the slowing of the global economy generally, could send the U.S. into a new recession, further exacerbate concerns over sovereign debt of other countries and disrupt economic activity in the U.S. and elsewhere. Similarly, concerns about the solvency of certain European Union member states, and of financial institutions that have significant direct or indirect exposure to debt issued by them, has created market volatility that continues to affect the performance of various asset classes, and likely will continue until there is an ultimate resolution of these sovereign debt related concerns. 

While we monitor conditions in the financial markets, we cannot predict future conditions or their impact on our results of operations and financial condition. Depending on conditions in the financial markets, we could incur additional realized and unrealized losses in our investment portfolio in future periods, and financial market volatility and uncertainty and an economic downturn could have a significant negative impact on third parties that we do business with, including insureds and reinsurers. 

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 84% 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 2015 earned premiums, our aggregate deductible under TRIPRA during 2016 is approximately $850 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;

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• 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-International business is also generally subject to a similar regulatory scheme in each of the jurisdictions where we conduct operations.

Federal financial services modernization legislation and legislative and regulatory initiatives taken or which may be taken in response to the current conditions in the financial markets and the recent economic downturn may lead to additional federal regulation of the insurance industry in the coming years.

In July 2010, President Obama signed into law the Dodd-Frank Wall Street Reform and Consumer Protection Act (the “Dodd-Frank Act”), which 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 insured's material financial distress or failure. The potential impact of the Dodd-Frank 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.

FSOC has designated four non-bank financial companies, including three insurance groups, as systematically significant.

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 over the past years various proposals relating to the creation of an optional federal charter, repeal of the insurance company antitrust exemption from the McCarran-Ferguson Act, and tax law changes. We may be subject to potentially increased federal oversight as a financial institution.  

With respect to international measures, Solvency II, the EU directive 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 may require us to utilize a significant amount of resources to ensure compliance. In addition, despite the one-year 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 finds that the insurance regulatory regimes of the jurisdictions outside the EU in which we have insurance or reinsurance companies domiciled are not "equivalent" to the requirements of Solvency II.

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, 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. 

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Our investments in non-U.S.-denominated securities 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.

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 Executive Chairman, our President and CEO, 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 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, 2015, the amount due from our reinsurers was approximately $1,533 million, including amounts due from state funds and industry pools where it was intended that we would bear no risk. Certain of these amounts due from reinsurers 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.

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

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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. In addition, we routinely transmit and receive personal, confidential and proprietary information by email and other electronic means. 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, we may be unable to put in place such secure capabilities with all of such vendors and third parties and, in addition, these third parties may not have appropriate controls in place to protect the confidentiality of the sensitive information being transferred. Our failure to protect sensitive personal and our proprietary information, whether owing to breaches of our own systems or those of our 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.

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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, 2015, our investment in fixed maturity securities was approximately $12.4 billion, or 77.3% 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 (5.4%); state and municipal securities (36.5%); corporate securities (27.9%); asset-backed securities (13.7%); mortgage-backed securities (9.8%) and foreign government (6.7%). 

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 historically 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. The economic downturn has resulted in many states and municipalities operating 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 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 significant volatility experienced in the financial markets, 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.

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, 2015, our investment in these assets was approximately $2.9 billion, or 18.0%, of our investment portfolio, including cash and cash equivalents. 

Merger and arbitrage trading securities were $376.7 million, or 2.3% of our investment portfolio, including cash and cash equivalents at December 31, 2015. 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 $2.4 billion, or 14.8% of our investment portfolio, including cash and cash equivalents at December 31, 2015. We also invest in aviation and rail equipment funds, hedged equity 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. 

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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 2016, the maximum amount of dividends that can be paid without regulatory approval is approximately $684 million. 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 holdingcompany laws require that, before a person can acquire control of an insurance company, prior written approvalmust be obtained from the insurance regulatory authorities in the state in which that insurance company isdomiciled. 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 ofthe voting securities of that insurer. Indirect ownership includes ownership of the shares of our common stock. Thus,the insurance regulatory authorities of the states in which our insurance operating units are domiciled are likely toapply these restrictions on acquisition of control to any proposed acquisition of our commonstock. Some states require a person seeking to acquire control of an insurer licensed but not domiciled in that state tomake a filing prior to completing an acquisition if the acquirer and its affiliates, on the one hand, and the targetinsurer 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.

While these provisions may not require acquisition approval, they can lead to the imposition of conditions on anacquisition that could delay or prevent its consummation.These laws may discourage potential acquisition proposals and may delay, deter or prevent a change in controlof us through transactions, and in particular unsolicited transactions, that some or all of our stockholders mightconsider 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.

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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, 2015, the Company had aggregate office space of 3,892,994 square feet, of which 1,066,705 were owned and 2,826,288 were leased.

Rental expense for the Company's operations was approximately $46,271,000, $45,198,000 and $44,752,000 for 2015, 2014 and 2013, respectively. Future minimum lease payments, without provision for sublease income, are $42,470,000 in 2016, $39,443,000 in 2017 and $200,636,000 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”.

	Price Range
	High		Low		Dividends Declared Per Share
2015:
Fourth Quarter	$	57.27	$	52.36	$0.12
Third Quarter	58.46		51.91		0.12
Second Quarter	53.40		48.72		0.12
First Quarter	51.78		47.45		0.11
2014:
Fourth Quarter	$	54.14	$	46.79	$1.11 (1)
Third Quarter	48.94		44.30		0.11
Second Quarter	46.36		40.56		0.11
First Quarter	43.35		37.82		0.10

__________________

(1) Includes a special dividend of $1.00 per share paid in December 2014.

The closing price of the common stock on February 18, 2016 as reported on the New York Stock Exchange was $52.17 per share. The approximate number of record holders of the common stock on February 17, 2016 was 364.

The Company did not repurchase any of its shares during the fourth quarter of 2015. The maximum number of shares the Company is authorized to repurchase as of December 31, 2015 under its current share repurchase program is 9,246,978.

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ITEM 6. SELECTED FINANCIAL DATA

	Year Ended December 31,
(In thousands, except per share data)	2015		2014		2013		2012		2011
Net premiums written	$6,189,515		$5,996,947		$5,500,173		$4,898,539		$4,357,368
Net premiums earned	6,040,609		5,744,418		5,226,537		4,673,516		4,160,867
Net investment income	512,645		600,885		544,291		586,763		526,351
Insurance service fees	139,440		117,443		107,513		103,133		92,843
Net investment gains	92,324		254,852		121,544		210,465		125,481
Revenues from wholly-owned investees	421,102		410,022		407,623		247,113		248,678
Total revenues	7,206,457		7,128,928		6,408,534		5,823,554		5,155,984
Interest expense	130,946		128,174		123,177		126,302		112,512
Income before income taxes	732,030		952,196		698,888		701,928		513,086
Income tax expense	(227,923	)	(302,593	)	(193,587	)	(191,285	)	(121,945	)
Noncontrolling interests	(413	)	(719	)	(5,376	)	(51	)	70
Net income to common stockholders	503,694		648,884		499,925		510,592		391,211
Data per common share:
Net income per basic share	4.06		5.07		3.69		3.72		2.80
Net income per diluted share	3.87		4.86		3.55		3.56		2.69
Common stockholders’ equity	37.31		36.21		32.79		31.66		28.75
Cash dividends declared	0.47		1.43		0.39		1.35		0.31
Weighted average shares outstanding:
Basic	124,040		127,874		135,305		137,097		139,688
Diluted	130,189		133,652		140,743		143,315		145,672
Investments	$15,351,467		$15,591,824		$14,548,630		$14,467,440		$13,439,518
Total assets	21,730,967		21,716,691		20,551,796		20,155,896		18,403,873
Reserves for losses and loss expenses	10,669,150		10,369,701		10,080,941		9,751,086		9,337,134
Senior notes and other debt	1,844,621		2,115,527		1,692,442		1,871,535		1,500,503
Subordinated debentures	340,320		340,060		339,800		243,206		242,997
Common stockholders’ equity	4,600,246		4,589,945		4,336,035		4,306,217		3,953,356

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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 in three business segments: Insurance-Domestic, Insurance-International and Reinsurance-Global. 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. Our 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, energy and agriculture, and on growing international markets, including Scandinavia, Australia, the Asia-Pacific region and South America.

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 statutory capital and surplus employed in the industry, and the industry’s willingness to deploy that capital.

Although insurance prices have generally increased for most lines of business since 2011, the rate of increase has declined in more recent years. 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 the Company to achieve its long-term return objectives. Part of the Company's strategy is to selectively reduce its business in areas where it believes returns are not adequate. Price changes are reflected in the Company’s results over time as premiums are earned.

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 are at historically low levels. The Company's investment income has been negatively impacted by the low fixed maturity investment returns, and will be further impacted if investment returns remain at this level.

The Company 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.

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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 2015:

(In thousands)	Frequency (+/-)
Severity (+/-)	1%		5%		10%
1%	$	73,437	$	221,040	$	405,545
5%	221,040		374,490		566,302
10%	405,545		566,302		767,248

Our net reserves for losses and loss expenses of approximately $9.2 billion as of December 31, 2015 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 $1.4 billion, or 15%, of the Company’s net loss reserves as of December 31, 2015 relate to the Reinsurance-Global 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.

Following is a summary of the Company’s reserves for losses and loss expenses by business segment as of December 31, 2015 and 2014:

(In thousands)	2015		2014
Insurance-Domestic	$	7,169,640	$	6,767,374
Insurance-International	706,553		750,613
Reinsurance-Global	1,368,679		1,452,654
Net reserves for losses and loss expenses	9,244,872		8,970,641
Ceded reserves for losses and loss expenses	1,424,278		1,399,060
Gross reserves for losses and loss expenses	$	10,669,150	$	10,369,701

Following is a summary of the Company’s net reserves for losses and loss expenses by major line of business as of December 31, 2015 and 2014:

(In thousands)	Reported Case Reserves		Incurred But Not Reported		Total
December 31, 2015
Other liability	$	1,079,641	$	1,947,637	$	3,027,278
Workers’ compensation (1)	1,655,726		1,263,508		2,919,234
Professional liability	256,783		478,796		735,579
Commercial automobile	352,208		242,071		594,279
Short-tail lines (2)	317,375		282,448		599,823
Total primary	3,661,733		4,214,460		7,876,193
Reinsurance (1)	631,666		737,013		1,368,679
Total	$	4,293,399	$	4,951,473	$	9,244,872
December 31, 2014
Other liability	$	1,035,442	$	1,785,598	$	2,821,040
Workers’ compensation (1)	1,603,310		1,201,117		2,804,427
Professional liability	308,887		453,557		762,444
Commercial automobile	319,700		203,085		522,785
Short-tail lines (2)	330,010		277,281		607,291
Total primary	3,597,349		3,920,638		7,517,987
Reinsurance (1)	603,851		848,803		1,452,654
Total	$	4,201,200	$	4,769,441	$	8,970,641

____________________

(1) Reserves for excess and assumed workers’ compensation business are net of an aggregate net discount of $699 million and $746 million as of December 31, 2015 and 2014, 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.

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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 three years ended December 31, 2015 are as follows:

(In thousands)	2015		2014		2013
Decrease in prior year loss reserves	$	46,713	$	75,764	$	78,810
Increase in prior year earned premiums	16,730		9,088		19,046
Net favorable prior year development	$	63,443	$	84,852	$	97,856

Favorable prior year development (net of additional and return premiums) was $63 million in 2015.

Insurance-Domestic - Reserves for the Insurance-Domestic segment developed favorably by $47 million in 2015. The favorable development was primarily related to workers' compensation and other liability business, and was partially offset by unfavorable development for commercial automobile 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 2006. In 2015, reported workers' compensation losses were below our expectations for many of our operating units. In addition, overall loss frequency and severity trends emerged better than the assumptions underlying our previous reserve estimates. The long term trend of declining workers' compensation claim frequency continued in 2015. The improvement is attributable to better workplace safety and to benign medical severity trends as we continue to invest in medical case management services and higher usage of preferred provider networks.

For other liability business, favorable development was concentrated in accident years 2007 through 2013. The favorable development was primarily related to our excess and surplus lines casualty business that has benefited from a persistent improvement in claim frequency trends over the past several years.

For commercial automobile business, adverse development was primarily related to large losses for long-haul trucking business and to accident years 2011 through 2014. The higher loss cost trends for the commercial automobile industry are attributable, in part, to the increase in miles driven as the economy has improved and fuel prices have declined over the past several years.

Reinsurance-Global - Reserves for the Reinsurance-Global segment developed favorably by $11 million in 2015. The favorable development was primarily related to direct facultative reinsurance business and to accident years 2005 through 2013. Loss reserves developed favorably for umbrella business and for other liability coverage for contractors.

Insurance-International - Reserves for the Insurance-International segment developed favorably by $5 million in 2015. The favorable development was related primarily to commercial property. The favorable commercial property development was attributable to accident years 2012 through 2014 and was driven by favorable frequency and severity trends on property business written in Lloyd's. The favorable property development was partially offset by unfavorable development for professional indemnity business in the U.K., primarily for accident years 2006 through 2013.

Favorable prior year development (net of additional and return premiums) was $85 million in 2014.

For the Insurance-Domestic segment, favorable development in 2014 of $92 million was driven primarily by other liability business for accident years 2006 through 2010, primarily related to our excess and surplus lines casualty business. Reported losses during these years continued to be below our initial expectations at the time the business was written, largely as a result of persistent improvement in claim frequency trends (i.e., number of reported claims per unit of exposure). As these accident years have matured, the weighting of actuarial methods has shifted from methods based on initial expected losses to

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methods based on actual reported losses. We believe the favorable claim frequency trends we have seen during this time period are due to changes in the mix of business written and to the general slowdown in the economy. Commercial automobile reported unfavorable development primarily as a result of large losses for long-haul trucking business in 2012 and 2013.

For the Reinsurance-Global segment, favorable reserve development in 2014 of $16 million was driven primarily by assumed professional liability excess of loss and umbrella treaty business, as well as direct facultative business. This was partially offset by adverse development on brokerage facultative business caused by completed operations losses associated with construction projects in accident years prior to 2009.

For the Insurance-International segment, adverse reserve development in 2014 of $23 million was driven primarily by unexpected large losses from accident years 2009-2012 in the professional indemnity line of business in the United Kingdom.

Favorable prior year reserve development (net of additional and return premiums) was $98 million in 2013.

Favorable development in 2013 was primarily attributable to accident years 2006 through 2012 and included favorable development of $39 million for other liability business, $32 million for reinsurance assumed liability business, $22 million for workers’ compensation, $18 million for commercial property and $24 million for other lines of business. The favorable development in 2013 was largely driven by loss cost trends, which were more favorable than originally anticipated. In particular, loss frequency trends have been more favorable than expected for excess & surplus lines casualty business, workers' compensation and excess of loss professional and other liability business.

The 2013 favorable development was partially offset by unfavorable development of $23 million for commercial automobile business and $14 million for products liability business. Commercial automobile development was driven by large losses for long-haul trucking business in 2011 and 2012. Product liability development stemmed from completed operations losses associated with construction projects in accident years prior to 2009.

Reserve Discount. The Company discounts its liabilities for certain workers’ compensation reserves. The amount of workers’ compensation reserves that were discounted was $2,308 million and $2,187 million at December 31, 2015 and 2014, respectively. The aggregate net discount for those reserves, after reflecting the effects of ceded reinsurance, was $699 million and $746 million at December 31, 2015 and 2014, respectively. At December 31, 2015, discount rates by year ranged from 2.0% to 6.5%, with a weighted average discount rate of 3.9%.

Substantially all of discounted workers’ compensation reserves (98% of total discounted reserves at December 31, 2015) 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 2% of total discounted reserves at December 31, 2015), 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.

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 $62 million and $85 million at December 31, 2015 and December 31, 2014, 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. Since equity securities do not have a contractual cash flow

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or maturity, the Company considers whether the price of an equity security is expected to recover within a reasonable period of time.

The Company classifies its fixed maturity securities and preferred stocks by credit rating, primarily based on ratings assigned by credit rating agencies. For purposes of classifying securities with different ratings, the Company uses the lower rating if two ratings were assigned and the middle rating if three ratings were assigned, unless the Company’s own analysis indicates that the lower 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.

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, 2015:

(Dollars in thousands)	Number of Securities	Aggregate Fair Value		Unrealized Loss
Unrealized loss less than 20% of amortized cost	543	$	4,015,415	$	58,570
Unrealized loss of 20% or greater of amortized cost:
Less than twelve months	10	56,158		17,144
Twelve months and longer	15	50,013		15,692
Total	568	$	4,121,586	$	91,406

A summary of the Company’s non-investment grade fixed maturity securities that were in an unrealized loss position at December 31, 2015 is presented in the table below.

(Dollars in thousands)	Number of Securities	Aggregate Fair Value		Unrealized Loss
Mortgage-backed securities	8	$	23,370	$	1,790
Asset-backed securities	7	19,535		264
Corporate	12	128,716		6,717
Foreign government	1	13,956		3,766
Total	28	$	185,577	$	12,537

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, 2015, OTTI for fixed maturities recognized in earnings were $9.0 million, all of

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which were considered due to credit factors. There were no OTTI of fixed maturity securities for the year ended December 31, 2014.

Preferred Stocks – At December 31, 2015, there was 1 preferred stock in an unrealized loss position, with an aggregate fair value of $22.3 million and a gross unrealized loss of $3.4 million. The preferred stock is rated investment grade. Management believes the unrealized loss is due primarily to market and sector related factors and does not consider it to be OTTI. For the year ended December 31, 2015, OTTI for preferred stocks were $13.4 million. There were no OTTI for preferred stocks for the year ended December 31, 2014.

Common Stocks – At December 31, 2015, there were two common stocks in an unrealized loss position with an aggregate fair value of $26.5 million and a gross unrealized loss of $19.2 million. Based on management's view of the underlying securities, the Company does not consider the common stocks to be OTTI. For the year ended December 31, 2015, OTTI for common stocks were $10.9 million. There were no OTTI for common stocks for the year ended December 31, 2014.

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 $2 million and $3 million at December 31, 2015 and 2014, respectively.

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 and equity securities 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. 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 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.

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The following is a summary of pricing sources for the Company's fixed maturity securities available for sale as of December 31, 2015:

(In thousands)	Carrying Value		Percent of Total
Pricing source:
Independent pricing services	$	12,132,829	98.3	%
Syndicate manager	64,758		0.5
Directly by the Company based on:
Observable data	150,187		1.2
Cash flow model	353		—
Total	$	12,348,127	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, 2015, 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, 2015 and 2014

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, 2015 and 2014. 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)	2015			2014
Insurance-Domestic
Gross premiums written	$	5,684,188		$	5,383,679
Net premiums written	4,812,830			4,517,587
Net premiums earned	4,659,359			4,271,933
Loss ratio	61.2		%	60.2		%
Expense ratio	31.2			31.6
GAAP combined ratio	92.4			91.8
Insurance-International
Gross premiums written	$	923,304		$	984,271
Net premiums written	778,567			828,076
Net premiums earned	772,141			802,375
Loss ratio	58.2		%	62.8		%
Expense ratio	41.4			40.0
GAAP combined ratio	99.6			102.8
Reinsurance-Global
Gross premiums written	$	642,501		$	694,888
Net premiums written	598,118			651,284
Net premiums earned	609,109			670,110
Loss ratio	58.4		%	62.0		%
Expense ratio	38.2			34.0
GAAP combined ratio	96.6			96.0
Consolidated
Gross premiums written	$	7,249,993		$	7,062,838
Net premiums written	6,189,515			5,996,947
Net premiums earned	6,040,609			5,744,418
Loss ratio	60.5		%	60.8		%
Expense ratio	33.2			33.0
GAAP combined ratio	93.7			93.8

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, 2015 and 2014.

(In thousands, except per share data)	2015		2014
Net income to common stockholders	$	503,694	$	648,884
Weighted average diluted shares	130,189		133,652
Net income per diluted share	$	3.87	$	4.86

The Company reported net income of $504 million in 2015 compared to $649 million in 2014. The 22% decrease in net income was primarily due to decreases in after-tax net investment gains of $106 million and after-tax net investment income of $60 million partially offset by an increase in after-tax underwriting income of $14 million. The number of weighted average diluted shares decreased as a result of the Company’s repurchases of its common stock in 2015 and 2014.

Premiums. Gross premiums written were $7,250 million in 2015, an increase of 3% from $7,063 million in 2014. The growth was due to a combination of increased exposures and higher rates. Approximately 77% of policies expiring in 2015 were renewed, compared with a 79% renewal retention rate for policies expiring in 2014.

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Average renewal premium rates (adjusted for change in exposures) increased 6.5% in 2013, 3.4% in 2014 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 2015 compared with 2014 by line of business within each business segment follows:

• Insurance-Domestic gross premiums increased 6% to $5,684 million in 2015 from$5,384 million in 2014. Gross premiums increased $120 million (8%) for workers' compensation, $86 million (5%) for other liability, $70 million (15%) for professional liability and $29 million (2%) for short-tail lines and decreased $5 million (1%) for commercial auto.

• Insurance-International gross premiums decreased 6% to $923 million in 2015 from $984 million in 2014. Gross premiums decreased $81 million (15%) for short-tail lines and $38 million (30%) for professional liability and increased $26 million (23%) for other liability, $22 million (31%) for workers' compensation and $10 million (7%) for commercial auto. In local currency terms, gross premiums increased 4%.

• Reinsurance-Global gross premiums decreased 8% to $643 million in 2015 from $695 million in 2014. Gross premiums written decreased $36 million (8%) for casualty lines and $16 million (7%) for property lines.

Net premiums written were $6,190 million in 2015, an increase of 3% from $5,997 million in 2014. Ceded reinsurance premiums as a percentage of gross written premiums were 15% in 2015 and 2014.

Premiums earned increased 5% to $6,041 million in 2015 from $5,744 million in 2014. 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 2015 are related to business written during both 2015 and 2014. Audit premiums were $153 million in 2015 compared with $118 million in 2014.

Net Investment Income. Following is a summary of net investment income for the years ended December 31, 2015 and 2014:

	Amount						Average Annualized Yield
(In thousands)	2015			2014			2015		2014
Fixed maturity securities, including cash and cash equivalents and loans receivable	$	428,325		$	439,489		3.2	%	3.4	%
Investment funds	62,228			131,649			5.2		12.7
Arbitrage trading account	16,891			22,438			3.3		3.9
Real estate	11,294			10,228			1.4		1.5
Equity securities available for sale	4,624			6,726			2.7		3.7
Gross investment income	523,362			610,530			3.3		3.9
Investment expenses	(10,717		)	(9,645		)
Total	$	512,645		$	600,885		3.2	%	3.9	%

Net investment income decreased 15% to $513 million in 2015 from $601 million in 2014 primarily due to a decrease in income from energy investment funds. Investment funds are reported on a one quarter lag. The average annualized yield for fixed maturity securities declined to 3.2% from 3.4% due to lower long-term reinvestment yields available in the market. The effective duration of the fixed maturity portfolio was 3.3 years at December 31, 2015 compared with 3.2 years at December 31, 2014. Average invested assets, at cost (including cash and cash equivalents), were $16.0 billion in 2015 and $15.6 billion in 2014.

Insurance Service Fees. The Company earns fees from an insurance distribution business and as a servicing carrier of workers' compensation assigned risk plans for certain states. Service fees increased 19% to $139 million in 2015 from $117 million in 2014 primarily as a result of an increase in fees from assigned risk plans.

Net Realized Gains on Investment Sales. The Company buys and sells securities on a regular basis in order to maximize its total return on investments. Decisions to sell securities are based on management’s view of the underlying fundamentals of specific securities as well as management’s expectations regarding interest rates, credit spreads, currency values and general economic conditions. Net realized gains on investment sales were $126 million in 2015 compared with $255 million in 2014. In 2015, realized gains were primarily related to sales of some shares of a publicly traded common stock held by one of the

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Company's investment funds. In 2014, realized gains included an $86 million gain from the sale of a commercial office building in London, England and a $39 million gain resulting from the initial public offering by the above public company.

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. Other-than-temporary impairments of $33 million in 2015 were primarily related to equity securities. There were no other-than-temporary impairments in 2014.

Revenues from Wholly-Owned Investees. Revenues from wholly-owned investees were derived from 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 wholly-owned investees increased to $421 million in 2015 from $410 million in 2014.

Losses and Loss Expenses. Losses and loss expenses increased to $3,656 million in 2015 from $3,491 million in 2014. The consolidated loss ratio was 60.5% in 2015 and 60.8% in 2014. Catastrophe losses, net of reinsurance recoveries and reinstatement premiums, were $58 million in 2015 compared with $87 million in 2014, a decrease of 0.4 loss ratio points. Favorable prior year reserve development (net of premium offsets) was $63 million in 2015 compared with $85 million in 2014, 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 decreased 0.2 points to 60.6% in 2015 from 60.8% in 2014. A summary of loss ratios in 2015 compared with 2014 by business segment follows:

• Insurance-Domestic - The loss ratio of 61.2% in 2015 was 1.0 point higher than the loss ratio of 60.2% in 2014. Catastrophe losses were $50 million in 2015 compared with $65 million in 2014, a decrease of 0.4 loss ratio points. Favorable prior year reserve development was $47 million in 2015 compared with $92 million in 2014, a difference of 1.1 loss ratio points. The loss ratio excluding catastrophe losses and prior year reserve development increased 0.3 points to 61.1% in 2015 from 60.8% in 2014.

• Insurance-International - The loss ratio of 58.2% in 2015 was 4.6 points lower than the loss ratio of 62.8% in 2014. Catastrophe losses were $5 million in 2015 compared with $20 million in 2014, a decrease of 1.9 loss ratio points. Favorable prior year reserve development was $5 million in 2015 compared with adverse development of $23 million in 2014, a difference of 3.7 loss ratio points. The loss ratio excluding catastrophe losses and prior year reserve development increased 1.0 points to 58.4% in 2015 from 57.4% in 2014.

• Reinsurance-Global - The loss ratio of 58.4% in 2015 was 3.6 points lower than the loss ratio of 62.0.% in 2014. Catastrophe losses were $3 million in 2015 compared with $2 million in 2014, an increase of 0.2 loss ratio points. Favorable prior year reserve development was $11 million in 2015 compared with $16 million in 2014, a difference of 0.6 loss ratio points. The loss ratio excluding catastrophe losses and prior year reserve development decreased 4.4 points to 59.7% in 2015 from 64.1% in 2014.

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

(In thousands)	2015		2014
Underwriting expenses	$	2,005,498	$	1,896,530
Service expenses	127,365		102,726
Net foreign currency losses (gains)	400		(27		)
Other costs and expenses	156,487		158,227
Total	$	2,289,750	$	2,157,456

Underwriting expenses are comprised of commissions paid to agents and brokers, premium taxes and other assessments and internal underwriting costs. Underwriting expenses increased 6%, compared with an increase in net premiums earned of 5%. The expense ratio (underwriting expenses expressed as a percentage of premiums earned) increased to 33.2% in 2015 from 33.0% in 2014 due primarily to lower earned premiums for the Insurance-International and Reinsurance-Global business segments.

Service expenses, which represent the costs associated with the fee-based businesses, increased 24% to $127 million, as a result of the acquisition of a specialty property and casualty insurance distribution company in late 2014.

Net foreign currency losses (gains) result from transactions denominated in a currencies other than an operating unit’s functional currency.

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. Other costs and expenses decreased to $156 million in 2015 from $158 million in 2014.

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Expenses from Wholly-Owned Investees. Expenses from wholly-owned investees represent costs associated with 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 wholly-owned investees were $397 million in 2015 compared to $401 million in 2014.

Interest Expense. Interest expense was $131 million in 2015 compared with $128 million in 2014. In August 2014, the Company issued $350 million of 4.75% senior notes due 2044. A portion of the proceeds was used to repay $200 million of 5.60% senior notes on May 15, 2015.

Income Taxes. The effective income tax rate was 31% in 2015 compared to 32% in 2014. The lower tax rate in 2015 was due, in part, to the utilization of foreign tax credits. The effective income tax rate differs from the federal income tax rate of 35% primarily because of tax-exempt investment income.

The Company has not provided U.S. deferred income taxes on the undistributed earnings of approximately $79 million of its non-U.S. subsidiaries since these earnings are intended to be permanently reinvested in the non-U.S. subsidiaries. However, in the future, if such earnings were distributed to the Company, taxes of approximately $9.8 million, assuming all tax credits are realized, would be payable on such undistributed earnings and would be reflected in the tax provision for the year in which these earnings are no longer intended to be permanently reinvested in the foreign subsidiary.

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Results of Operations for the Years Ended December 31, 2014 and 2013

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, 2014 and 2013. 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)	2014			2013
Insurance-Domestic
Gross premiums written	$	5,383,679		$	4,803,753
Net premiums written	4,517,587			3,994,387
Net premiums earned	4,271,933			3,782,416
Loss ratio	60.2		%	61.3		%
Expense ratio	31.6			32.7
GAAP combined ratio	91.8			94.0
Insurance-International
Gross premiums written	$	984,271		$	898,776
Net premiums written	828,076			756,185
Net premiums earned	802,375			723,151
Loss ratio	62.8		%	59.4		%
Expense ratio	40.0			39.0
GAAP combined ratio	102.8			98.4
Reinsurance-Global
Gross premiums written	$	694,888		$	808,562
Net premiums written	651,284			749,601
Net premiums earned	670,110			720,970
Loss ratio	62.0		%	62.2		%
Expense ratio	34.0			34.8
GAAP combined ratio	96.0			97.0
Consolidated
Gross premiums written	$	7,062,838		$	6,511,091
Net premiums written	5,996,947			5,500,173
Net premiums earned	5,744,418			5,226,537
Loss ratio	60.8		%	61.2		%
Expense ratio	33.0			33.9
GAAP combined ratio	93.8			95.1

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, 2014 and 2013.

(In thousands, except per share data)	2014		2013
Net income to common stockholders	$	648,884	$	499,925
Weighted average diluted shares	133,652		140,743
Net income per diluted share	$	4.86	$	3.55

The Company reported net income of $649 million in 2014 compared to $500 million in 2013. The 30% increase in net income was primarily due to increases in after-tax net investment gains of $92 million, after-tax underwriting income of $64 million and after-tax net investment income of $16 million. The number of weighted average diluted shares decreased as a result of the Company’s repurchases of its common stock in 2014 and 2013.

Premiums. Gross premiums written were $7,063 million in 2014, an increase of 8% from $6,511 million in 2013. The growth was due to a combination of rate increases and increased exposures. Approximately 79% of policies expiring in 2014 were renewed, compared with a 76% renewal retention rate for policies expiring in 2013.

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Average renewal premium rates (adjusted for change in exposures) increased 6.8% in 2012, 6.5% in 2013 and 3.4% in 2014. 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 2014 compared with 2013 by line of business within each business segment follows:

• Insurance-Domestic gross premiums increased 12% to $5,384 million in 2014 from $4,804 million in 2013. Gross premiums increased $169 million (13%) for workers' compensation, $160 million (10%) for other liability, $120 million (11%) for short-tail lines, $85 million (22%) for professional liability and $46 million (9%) for commercial auto.

• Insurance-International gross premiums increased 10% to $984 million in 2014 from $899 million in 2013. Gross premiums increased $77 million (16%) for short-tail lines, $21 million (23%) for other liability and $10 million (9%) for professional liability and decreased $13 million (15%) for workers' compensation and $10 million (8%) for commercial auto. In local currency terms, gross premiums increased 17%.

• Reinsurance-Global gross premiums decreased 14% to $695 million in 2014 from $809 million in 2013. Gross premiums written decreased $66 million (12%) for casualty lines and $48 million (17%) for property lines.

Net premiums written were $5,997 million in 2014, an increase of 9% from $5,500 million in 2013. Ceded reinsurance premiums as a percentage of gross written premiums were 15% in 2014 and 16% in 2013. The decrease in the percentage of business ceded was due to changes in the reinsurance terms and costs.

Premiums earned increased 10% to $5,744 million in 2014 from $5,227 million in 2013. Insurance premiums (including the impact of rate changes) are generally earned evenly over the policy term, and accordingly we expect recent rate increases will be earned over the upcoming quarters. Premiums earned in 2014 are related to business written during both 2014 and 2013. Audit premiums were $118 million in 2014 compared with $120 million in 2013.

Net Investment Income. Following is a summary of net investment income for the years ended December 31, 2014 and 2013:

	Amount						Average Annualized Yield
(In thousands)	2014			2013			2014		2013
Fixed maturity securities, including cash and cash equivalents and loans receivable	$	439,489		$	442,287		3.4	%	3.5	%
Investment funds	131,649			67,712			12.7		8.0
Arbitrage trading account	22,438			20,431			3.9		4.2
Real estate	10,228			12,498			1.5		2.0
Equity securities available for sale	6,726			11,380			3.7		3.8
Gross investment income	610,530			554,308			3.9		3.7
Investment expenses	(9,645		)	(10,017		)
Total	$	600,885		$	544,291		3.9	%	3.7	%

Net investment income increased 10% to $601 million in 2014 from $544 million in 2013 primarily due to an increase in income from investment funds, including aviation and rail equipment funds, real estate funds and energy funds. Investment funds are reported on a one quarter lag. The average annualized yield for fixed maturity securities declined to 3.4% from 3.5% due to lower long-term reinvestment yields available in the market. The effective duration of the fixed maturity portfolio was 3.2 years at December 31, 2014 compared with 3.3 years at December 31, 2013. Average invested assets, at cost (including cash and cash equivalents), were $15.6 billion in 2014 and $14.8 billion in 2013.

Insurance Service Fees. The Company earns fees from an insurance distribution business and as a servicing carrier of workers' compensation assigned risk plans for certain states. Service fees increased to $117 million in 2014 from $108 million in 2013 primarily as a result of an increase in fees from assigned risk plans.

Net Realized Gains on Investment Sales. The Company buys and sells securities on a regular basis in order to maximize its total return on investments. Decisions to sell securities are based on management’s view of the underlying fundamentals of specific securities as well as management’s expectations regarding interest rates, credit spreads, currency values and general economic conditions. Net realized gains on investment sales were $255 million in 2014 compared with $128 million in 2013. Realized gains in 2014 were related primarily to the sale of real estate, investment funds and fixed income and equity securities

45

and included an $86 million gain from the sale of a commercial office building in London, England and a gain of $39 million resulting from an initial public offering by one of the Company's private equity investees.

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 2014 compared with $6 million in 2013.

Revenues from Wholly-Owned Investees. Revenues from wholly-owned investees were derived from 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 wholly-owned investees increased to $410 million in 2014 from $408 million in 2013.

Losses and Loss Expenses. Losses and loss expenses increased to $3,491 million in 2014 from $3,197 million in 2013. The consolidated loss ratio was 60.8% in 2014 and 61.2% in 2013. Catastrophe losses, net of reinsurance recoveries and reinstatement premiums, were $87 million in 2014 compared with $65 million in 2013, an increase of 0.3 loss ratio points. Favorable prior year reserve development (net of premium offsets) was $85 million in 2014 compared with $98 million in 2013, 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 decreased 1.0 points to 60.8% in 2014 from 61.8% in 2013. A summary of loss ratios in 2014 compared with 2013 by business segment follows:

• Insurance-Domestic - The loss ratio of 60.2% in 2014 was 1.1 points lower than the loss ratio of 61.3% in 2013. Catastrophe losses were $65 million in 2014 compared with $38 million in 2013, an increase of 0.5 loss ratio points. Favorable prior year reserve development was $92 million in 2014 compared with $71 million in 2013, a difference of 0.3 loss ratio points. The loss ratio excluding catastrophe losses and prior year reserve development decreased 1.4 points to 60.8% in 2014 from 62.2% in 2013.

• Insurance-International - The loss ratio of 62.8% in 2014 was 3.4 points higher than the loss ratio of 59.4% in 2013. Catastrophe losses were $20 million in 2014 compared with $11 million in 2013, an increase of 0.9 loss ratio points. Adverse prior year reserve development was $23 million in 2014 compared with $12 million in 2013, a difference of 1.2 loss ratio points. The loss ratio excluding catastrophe losses and prior year reserve development increased 1.3 points to 57.4% in 2014 from 56.1% in 2013.

• Reinsurance-Global - The loss ratio of 62.0% in 2014 was 0.2 points lower than the loss ratio of 62.2% in 2013. Catastrophe losses were $2 million in 2014 compared with $16 million in 2013, a decrease of 1.9 loss ratio points. Favorable prior year reserve development was $16 million in 2014 compared with $39 million in 2013, a difference of 3.0 loss ratio points. The loss ratio excluding catastrophe losses and prior year reserve development decreased 1.3 points to 64.1% in 2014 from 65.4% in 2013.

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

(In thousands)	2014			2013
Underwriting expenses	$	1,896,530		$	1,771,128
Service expenses	102,726			88,662
Net foreign currency gains	(27		)	(10,120		)
Debt extinguishment costs	—			6,709
Other costs and expenses	158,227			144,305
Total	$	2,157,456		$	2,000,684

Underwriting expenses are comprised of commissions paid to agents and brokers, premium taxes and other assessments and internal underwriting costs. Underwriting expenses increased 7% compared with an increase in net premiums earned of 10%. The expense ratio (underwriting expenses expressed as a percentage of premiums earned) was 33.0% in 2014, down from 33.9% in 2013, primarily due to higher earned premiums and to the impact of expense reduction initiatives.

Service expenses, which represent the costs associated with the fee-based businesses, increased 16% to $103 million. The increase was due to an increase in general and administrative expenses and to additional costs associated with new programs.

Net foreign currency gains of $27,000 in 2014 (compared with $10 million in 2013) resulted from transactions denominated in a currencies other than an operating unit’s functional currency.

Debt extinguishment costs of $7 million in 2013 related to the prepayment of subordinated debentures that were due in 2045 and were prepaid in May 2013.

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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. Other costs and expenses increased to $158 million in 2014 from $144 million in 2013 due primarily to an increase in general and administrative expenses, including employment costs and benefits.

Expenses from Wholly-Owned Investees. Expenses from wholly-owned investees represent costs associated with 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 wholly-owned investees were $401 million in 2014 compared to $389 million in 2013, primarily due to start-up costs from a new business operation.

Interest Expense. Interest expense was $128 million in 2014 compared with $123 million in 2013. In May 2013, the Company issued $350 million of 5.625% subordinated debentures due 2053 and prepaid $250 million of 6.750% subordinated debentures that were due in 2045. In August 2014, the Company issued $350 million of 4.75% senior notes due 2044. A portion of the proceeds was used to repay $200 million of 5.60% senior notes on May 15, 2015. In addition, the Company assumed $71 million of debt in conjunction with the acquisition of an office building in West Palm Beach, Florida, that matured in August 2015.

Income Taxes. The effective income tax rate was 32% in 2014 compared to 28% in 2013. The lower tax rate in 2013 was due, in part, to the utilization of foreign tax credits. The effective income tax rate differs from the federal income tax rate of 35% primarily because of tax-exempt investment income. Tax exempt investment income comprised a lower portion of the 2014 pre-tax income and as such had a lesser impact on the effective tax rate for 2014 compared with 2013.

The Company has not provided U.S. deferred income taxes on the undistributed earnings of approximately $58 million of its non-U.S. subsidiaries since these earnings are intended to be permanently reinvested in the non-U.S. subsidiaries. However, in the future, if such earnings were distributed to the Company, taxes of approximately $3.1 million, assuming all tax credits are realized, would be payable on such undistributed earnings and would be reflected in the tax provision for the year in which these earnings are no longer intended to be permanently reinvested in the foreign subsidiary.

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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 historically 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 3.3 years and 3.2 years at December 31, 2015 and 2014, respectively. The Company’s investment portfolio and investment-related assets as of December 31, 2015 were as follows:

($ in thousands)	Carrying Value		Percent of Total
Fixed maturity securities:
U.S. government and government agencies	$	670,419	4.2	%
State and municipal:
Special revenue	2,632,626		16.4
State general obligation	641,790		4.0
Pre-refunded (1)	472,697		2.9
Corporate backed	402,541		2.5
Local general obligation	387,654		2.4
Total state and municipal	4,537,308		28.2
Mortgage-backed securities:
Agency	855,195		5.4
Residential-Prime	245,611		1.5
Commercial	65,722		0.4
Residential-Alt A	52,469		0.3
Total mortgage-backed securities	1,218,997		7.6
Asset-backed securities	1,705,172		10.6
Corporate:
Industrial	2,021,534		12.5
Financial	1,173,021		7.3
Utilities	198,651		1.2
Other	81,832		0.5
Total corporate	3,475,038		21.5
Foreign government	837,460		5.2
Total fixed maturity securities	12,444,394		77.3
Equity securities available for sale:
Preferred stocks	113,593		0.7
Common stocks	37,273		0.2
Total equity securities available for sale	150,866		0.9
Cash and cash equivalents	763,631		4.7
Investment funds	1,170,040		7.3
Real estate	936,367		5.8
Arbitrage trading account	376,697		2.3
Loans receivable	273,103		1.7
Total investments	$	16,115,098	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.

At December 31, 2015, investments in foreign government fixed maturity securities were as follows:

(In thousands)	Carrying Value
Australia	$	230,036
United Kingdom	165,114
Canada	150,501
Argentina	105,428
Germany	51,759
Brazil	51,405
Supranational (1)	36,090
Norway	31,656
Singapore	6,101
Colombia	5,502
Uruguay	3,868
Total	$	837,460

_______________

(1) Supranational represents investments in the North American Development Bank, European Investment Bank and International Bank for Reconstruction & Development.

Equity Securities Available for Sale. Equity securities available for sale primarily represent investments in high-dividend yielding common and preferred stocks issued by large market capitalization companies.

Investment Funds. At December 31, 2015, the carrying value of investment funds was $1,170 million, including investments in real estate funds of $581 million, energy funds of $94 million and hedged equity funds of $71 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, 2015, real estate properties in operation included a long-term ground lease in Washington D.C. and office buildings in West Palm Beach and Palm Beach, Florida. In addition, there are three properties under development: an office building in London, a mixed-use project in Washington D.C. and an office complex in New York City. The Company expects to fund further development costs for these projects 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 $273 million and an aggregate fair value of $276 million at December 31, 2015. The amortized cost of loans receivable is net of a valuation allowance of $2 million as of December 31, 2015. Loans receivable include real estate loans of $200 million that are secured by commercial real estate located primarily in Arizona, Maryland, New York, and Tennessee. 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 $73 million that are secured by business assets. Commercial loans have fixed interest rates and varying maturities not exceeding 10 years.

49

Liquidity and Capital Resources

Cash Flow. Cash flow provided from operating activities increased to $881 million in 2015 from $735 million in 2014. The increase in cash flow was due primarily to an increase in cash flow from underwriting activities and a decrease in income taxes paid. Paid losses as a percent of earned premiums were 54% in both 2015 and 2014.

As a holding company, the Company derives cash from its subsidiaries in the form of dividends, tax payments and management fees. Maximum amounts of dividends that our insurance companies can pay without regulatory approval are prescribed by statute. During 2016, the maximum amount of dividends which can be paid without regulatory approval is approximately $684 million. The ability of the holding company to service its debt obligations is limited by the ability of its insurance subsidiaries to pay dividends. In the event dividends, tax payments and management fees available to the holding company were inadequate to service its debt obligations, the Company would need to raise capital, sell assets or restructure its debt obligations.

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 has targeted an effective 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 80% invested in cash, cash equivalents and marketable fixed income securities as of December 31, 2015. 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, 2015, the Company had senior notes, subordinated debentures and other debt outstanding with a carrying value of $2,185 million and a face amount of $2,208 million. The maturities of the outstanding debt are $43 million in 2016, $37 million in 2017, $450 million in 2019, $300 million in 2020, $426 million in 2022, $2 million in 2029, $250 million in 2037, $350 million in 2044 and $350 million in 2053.

In August 2014, the Company issued $350 million of 4.75% senior notes due 2044. A portion of the proceeds was used to repay $200 million of 5.60% senior notes on May 15, 2015.

Equity. The Company repurchased 4,502,025, 5,816,468, and 3,924,355 shares of its common stock in 2015, 2014 and 2013, respectively. The aggregate cost of the repurchases was $224 million in 2015, $239 million in 2014, and $166 million in 2013. At December 31, 2015, total common stockholders’ equity was $4.6 billion, common shares outstanding were 123,307,837 and stockholders’ equity per outstanding share was $37.31.

Total Capital.Total capitalization (equity, senior notes and other debt and subordinated debentures) was $6.8 billion at December 31, 2015. The percentage of the Company’s capital attributable to senior notes, subordinated debentures and other debt was 32% at December 31, 2015 and 35% at December 31, 2014.

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, 2015, the Company had a deferred gross tax asset (net of valuation allowance) of $452 million (which primarily relates to loss and loss expense reserves and unearned premium reserves) and a gross deferred tax liability of $459 million (which primarily relates to deferred policy acquisition costs and unrealized investment gains). 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.

The Company has not provided U.S. deferred income taxes on the undistributed earnings of approximately $79 million of its non-U.S. subsidiaries since these earnings are intended to be permanently reinvested in the non-U.S. subsidiaries. However, in the future, if such earnings were distributed to the Company, taxes of approximately $9.8 million, assuming all tax credits are realized, would be payable on such undistributed earnings and would be reflected in the tax provision for the year in which these earnings are no longer intended to be permanently reinvested in the foreign subsidiary.

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 substantial and 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, 2016: The Company’s property per risk reinsurance generally covers losses between $2.5 million and $50 million. The Company’s catastrophe excess of loss reinsurance program provides protection for net losses between $30 million and $305 million for the majority of business written by its U.S. companies. The Company has separate catastrophe excess of loss reinsurance for business written through its Lloyd’s Syndicate that provides protection for losses between $15 million and $55 million for events in North America. For North American losses greater than $55 million, the business written through the company's Lloyd's Syndicate is protected within the U.S.program up to $305 million. 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 in effect as of January 1, 2016 provides protection for losses between $2.5 million and $70 million from single events with claims involving two or more claimants or insureds. The treaty also covers casualty contingency losses in excess of $5 million and up to $70 million. For losses involving two or more claimants for primary workers’ compensation business, coverage is generally in place for losses between $5 million and $170 million. For excess workers’ compensation business, such coverage is generally in place for losses between $25 million and $245 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 most of its significant 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. 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 this reinsurance coverage, unexpired policies would not be protected.

Following is a summary of earned premiums and loss and loss expenses ceded to reinsurers for each of the three years ended December 31, 2015:

	Years Ended December 31,
(In thousands)	2015		2014		2013
Earned premiums	$	1,050,840	$	1,030,666	$	959,537
Losses and loss expenses	501,999		475,802		556,108

Ceded earned premiums increased 2% in 2015 to $1,051 million, less than the increase in direct and assumed earned premiums of 5%. The ceded losses and loss expenses ratio increased 2 points to 48% in 2015 from 46% in 2014.

51

The following table presents the credit quality of amounts due from reinsurers as of December 31, 2015. 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:
Alleghany Group	A+		$	138,163
Munich Re	AA-		121,661
Swiss Re	AA-		115,215
Lloyd's of London	A+		92,635
Axis Capital	A+		69,840
Partner Re	A+		65,793
Hannover Re Group	AA-		48,675
Everest Re	A+		47,945
Berkshire Hathaway	AA+		47,309
Chubb Limited (2)	AA		45,645
Arch Capital Group	A+		23,273
Other reinsurers:
Rated A- or better			140,608
Secured (3)			48,399
All others			24,162
Subtotal			1,029,323
Residual market pools (4)			503,506
Total			$	1,532,829

_________________

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

(2) Includes the aggregate recoverables from Ace Group and Chubb Group.

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

(4) 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, 2015:

(In thousands)
Estimated Payments By Periods	2016		2017		2018		2019		2020		Thereafter
Gross reserves for losses	$	2,749,845	$	1,920,659	$	1,407,275	$	1,017,821	$	743,291	$	3,589,395
Operating lease obligations	42,470		39,443		35,286		30,941		28,584		105,825
Purchase obligations	152,857		76,819		47,362		39,124		38,600		12,000
Subordinated debentures	—		—		—		—		—		350,000
Debt maturities	42,794		36,908		—		450,000		300,000		1,028,553
Interest payments	124,409		122,988		122,379		112,466		86,326		2,034,162
Other long-term liabilities	4,807		4,377		4,033		3,678		3,387		29,170
Total	$	3,117,182	$	2,201,194	$	1,616,335	$	1,654,030	$	1,200,188	$	7,149,105

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, 2015. 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, 2015, the Company had commitments to invest up to $117 million and $485 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 $15 million as of December 31, 2015. 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 3.3 years and 3.2 years at December 31, 2015 and 2014, 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, 2015:

	Effective
	Duration
(Dollars in thousands)	(Years)	Fair Value
Cash and cash equivalents	—	$	763,631
U. S. government and governmental agencies	3.0	670,419
State and municipal	4.5	4,553,554
Asset-backed securities	1.1	1,705,172
Corporate	3.7	3,475,038
Foreign government	2.7	837,460
Mortgage-backed securities	3.2	1,221,204
Loans receivable	2.1	275,747
Total	3.3	13,502,225

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, 2015 would be as follows:

(In thousands)	Estimated Fair Value		Change in Fair Value
Change in interest rates:
300 basis point rise	$	12,360,508	$	(1,141,717	)
200 basis point rise	12,719,858		(782,367		)
100 basis point rise	13,100,237		(401,988		)
Base scenario	13,502,225		—
100 basis point decline	13,925,214		422,989
200 basis point decline	14,364,165		861,940
300 basis point decline	14,824,542		1,322,317

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

The Board of Directors and Stockholders

W. R. Berkley Corporation:

We have audited the accompanying consolidated balance sheets of W. R. Berkley Corporation and subsidiaries as of December 31, 2015 and 2014, and 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, 2015. These consolidated financial statements are the responsibility of the Company's management. Our responsibility is to express an opinion on these consolidated financial statements based on our audits.

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

In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of W. R. Berkley Corporation and subsidiaries as of December 31, 2015 and 2014, and the results of their operations and their cash flows for each of the years in the three-year period ended December 31, 2015, 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), W. R. Berkley Corporation's internal control over financial reporting as of December 31, 2015, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO), and our report dated February 22, 2016 expressed an unqualified opinion on the effectiveness of the Company's internal control over financial reporting.

/S/ KPMG LLP

New York, New York

February 22, 2016

55

W. R. BERKLEY CORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF INCOME

	Years Ended December 31,
(In thousands, except per share data)	2015			2014			2013
REVENUES:
Net premiums written	$	6,189,515		$	5,996,947		$	5,500,173
Change in net unearned premiums	(148,906		)	(252,529		)	(273,636		)
Net premiums earned	6,040,609			5,744,418			5,226,537
Net investment income	512,645			600,885			544,291
Insurance service fees	139,440			117,443			107,513
Net investment gains:
Net realized gains on investment sales	125,633			254,852			127,586
Other-than-temporary impairments	(33,309		)	—			(6,042		)
Net investment gains	92,324			254,852			121,544
Revenues from wholly-owned investees	421,102			410,022			407,623
Other income	337			1,308			1,026
Total revenues	7,206,457			7,128,928			6,408,534
OPERATING COSTS AND EXPENSES:
Losses and loss expenses	3,656,270			3,490,567			3,197,024
Other operating costs and expenses	2,289,750			2,157,456			2,000,684
Expenses from wholly-owned investees	397,461			400,535			388,761
Interest expense	130,946			128,174			123,177
Total operating costs and expenses	6,474,427			6,176,732			5,709,646
Income before income taxes	732,030			952,196			698,888
Income tax expense	(227,923		)	(302,593		)	(193,587		)
Net income before noncontrolling interests	504,107			649,603			505,301
Noncontrolling interests	(413		)	(719		)	(5,376		)
Net income to common stockholders	$	503,694		$	648,884		$	499,925
NET INCOME PER SHARE:
Basic	$	4.06		$	5.07		$	3.69
Diluted	$	3.87		$	4.86		$	3.55

See accompanying notes to consolidated financial statements.

56

W. R. BERKLEY CORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

	Years Ended December 31,
(In thousands)	2015			2014			2013
Net income before noncontrolling interests	$	504,107		$	649,603		$	505,301
Other comprehensive income:
Change in unrealized translation adjustments	(124,744		)	(62,125		)	(23,848		)
Change in unrealized investment gains (losses), net of taxes	(125,542		)	49,666			(261,064		)
Change in unrecognized pension obligation, net of taxes	—			6,651			8,700
Other comprehensive loss	(250,286		)	(5,808		)	(276,212		)
Comprehensive income	253,821			643,795			229,089
Comprehensive income to the noncontrolling interest	(375		)	(752		)	(5,404		)
Comprehensive income to common shareholders	$	253,446		$	643,043		$	223,685

See accompanying notes to consolidated financial statements.

57

W. R. BERKLEY CORPORATION AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

	December 31,
(In thousands, except share data)	2015			2014
Assets
Investments:
Fixed maturity securities	$	12,444,394		$	12,705,160
Investment funds	1,170,040			1,211,401
Real estate	936,367			731,612
Arbitrage trading account	376,697			450,648
Loans receivable	273,103			322,012
Equity securities available for sale	150,866			170,991
Total investments	15,351,467			15,591,824
Cash and cash equivalents	763,631			674,441
Premiums and fees receivable	1,669,186			1,651,088
Due from reinsurers	1,532,829			1,503,441
Deferred policy acquisition costs	513,128			488,525
Prepaid reinsurance premiums	394,387			395,748
Trading account receivable from brokers and clearing organizations	383,115			371,034
Property, furniture and equipment	348,224			332,098
Goodwill	153,291			150,944
Accrued investment income	123,164			120,367
Current federal and foreign income taxes	55,763			67,623
Other assets	442,782			369,558
Total assets	$	21,730,967		$	21,716,691
Liabilities and Equity
Liabilities:
Reserves for losses and loss expenses	$	10,669,150		$	10,369,701
Unearned premiums	3,137,133			3,026,732
Due to reinsurers	224,752			237,270
Trading account securities sold but not yet purchased	37,035			106,079
Deferred federal and foreign income taxes	6,811			37,452
Other liabilities	837,937			859,736
Senior notes and other debt	1,844,621			2,115,527
Subordinated debentures	340,320			340,060
Total liabilities	17,097,759			17,092,557
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, 123,307,837 and 126,748,836 shares, respectively	47,024			47,024
Additional paid-in capital	1,005,455			991,512
Retained earnings	6,178,070			5,732,410
Accumulated other comprehensive income (loss)	(66,698		)	183,550
Treasury stock, at cost, 111,810,081 and 108,369,082 shares, respectively	(2,563,605		)	(2,364,551		)
Total common stockholders’ equity	4,600,246			4,589,945
Noncontrolling interests	32,962			34,189
Total equity	4,633,208			4,624,134
Total liabilities and equity	$	21,730,967		$	21,716,691

See accompanying notes to consolidated financial statements.

58

W. R. BERKLEY CORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY

	Years Ended December 31,
(In thousands)	2015			2014			2013
COMMON STOCK:
Beginning and end of period	$	47,024		$	47,024		$	47,024
ADDITIONAL PAID IN CAPITAL:
Beginning of period	$	991,512		$	967,440		$	945,166
Stock options exercised and restricted units issued including tax benefit	(17,456		)	(4,485		)	(1,143		)
Restricted stock units expensed	30,691			27,966			22,881
Stock issued	708			591			536
End of period	$	1,005,455		$	991,512		$	967,440
RETAINED EARNINGS:
Beginning of period	$	5,732,410		$	5,265,015		$	4,817,807
Net income to common stockholders	503,694			648,884			499,925
Dividends	(58,034		)	(181,489		)	(52,717		)
End of period	$	6,178,070		$	5,732,410		$	5,265,015
ACCUMULATED OTHER COMPREHENSIVE INCOME:
Unrealized investment gains (losses):
Beginning of period	$	306,199		$	256,566		$	517,658
Unrealized gains (losses) on securities not other-than-temporarily impaired	(113		)	49,071			(261,791		)
Unrealized gains (losses) on other-than-temporarily impaired securities	(125,391		)	562			699
End of period	180,695			306,199			256,566
Currency translation adjustments:
Beginning of period	(122,649		)	(60,524		)	(36,676		)
Net change in period	(124,744		)	(62,125		)	(23,848		)
End of period	(247,393		)	(122,649		)	(60,524		)
Net pension asset:
Beginning of period	—			(6,651		)	(15,351		)
Net change in period	—			6,651			8,700
End of period	—			—			(6,651		)
Total accumulated other comprehensive income (loss)	$	(66,698	)	$	183,550		$	189,391
TREASURY STOCK:
Beginning of period	$	(2,364,551	)	$	(2,132,835	)	$	(1,969,411	)
Stock exercised/vested	23,975			6,623			2,452
Stock issued	623			594			597
Stock repurchased	(223,652		)	(238,933		)	(166,473		)
End of period	$	(2,563,605	)	$	(2,364,551	)	$	(2,132,835	)
NONCONTROLLING INTERESTS:
Beginning of period	$	34,189		$	33,359		$	29,249
Acquisition (sale) of noncontrolling interest	(1,602		)	78			(1,294		)
Net income	413			719			5,376
Other comprehensive income, net of tax	(38		)	33			28
End of period	$	32,962		$	34,189		$	33,359

See accompanying notes to consolidated financial statements.

59

W. R. BERKLEY CORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS

	Years Ended December 31,
(In thousands)	2015			2014			2013
CASH FROM OPERATING ACTIVITIES:
Net income to common stockholders	$	503,694		$	648,884		$	499,925
Adjustments to reconcile net income to net cash from operating activities:
Net investment gains	(92,324		)	(254,852		)	(121,544		)
Depreciation and amortization	85,139			88,836			103,090
Noncontrolling interests	413			719			5,376
Investment funds	(62,228		)	(131,649		)	(67,712		)
Stock incentive plans	32,123			28,068			23,784
Change in:
Arbitrage trading account	(7,173		)	(50,817		)	(10,324		)
Premiums and fees receivable	(60,942		)	(104,174		)	(138,027		)
Reinsurance accounts	(31,930		)	(33,445		)	(171,263		)
Deferred policy acquisition costs	(29,860		)	(42,789		)	(52,124		)
Current income taxes	20,428			(40,935		)	(45,613		)
Deferred income taxes	47,260			30,812			56,281
Reserves for losses and loss expenses	397,685			376,617			372,002
Unearned premiums	142,699			277,826			323,160
Other	(63,680		)	(58,254		)	42,787
Net cash from operating activities	881,304			734,847			819,798
CASH FLOWS USED IN INVESTING ACTIVITIES:
Proceeds from sale of fixed maturity securities	1,388,680			633,459			1,344,707
Proceeds from sale of equity securities	15,833			113,251			267,554
Distributions from (contributions to) investment funds	177,424			69,319			(236,580		)
Proceeds from maturities and prepayments of fixed maturity securities	2,999,339			2,605,839			2,718,156
Purchase of fixed maturity securities	(4,455,223		)	(4,292,165		)	(4,198,135		)
Purchase of equity securities	(29,526		)	(31,207		)	(156,557		)
Real estate purchased	(222,659		)	(213,159		)	(107,352		)
Proceeds from sale of real estate	—			343,723			—
Change in loans receivable	48,909			21,608			(30,974		)
Net additions to property, furniture and equipment	(63,562		)	(41,958		)	(63,150		)
Change in balances due from security brokers	(22,666		)	32,617			(26,155		)
Cash distributed in connection with business	—			15,783			—
Payment for business purchased, net of cash acquired	(7,312		)	(65,421		)	(56,878		)
Net cash used in investing activities	(170,763		)	(808,311		)	(545,364		)
CASH FLOWS USED IN FINANCING ACTIVITIES:
Net proceeds from issuance of debt	9,056			354,012			346,822
Net proceeds from stock options exercised	—			—			53
Repayment of senior notes and other debt	(281,086		)	(3,700		)	(465,389		)
Cash dividends to common stockholders	(58,034		)	(181,489		)	(52,717		)
Purchase of common treasury shares	(223,652		)	(238,933		)	(166,473		)
Other	(1,602		)	337			7,442
Net cash used in financing activities	(555,318		)	(69,773		)	(330,262		)
Net impact on cash due to change in foreign exchange rates	(66,033		)	(22,060		)	(10,104		)
Net increase (decrease) in cash and cash equivalents	89,190			(165,297		)	(65,932		)
Cash and cash equivalents at beginning of year	674,441			839,738			905,670
Cash and cash equivalents at end of year	$	763,631		$	674,441		$	839,738

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, 2015, 2014 and 2013

(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 2014 and 2013 financial statements to conform to the presentation of the 2015 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 increased net premiums written and premiums earned by $3 million, $9 million and $12 million in 2015, 2014 and 2013, respectively.

Revenues from wholly-owned investees are derived from aircraft services provided to the general, commercial and military aviation markets. These 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 parts, the delivery of aircraft, the delivery of fuel, and upon completion 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 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.

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Equity and 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. For certain investment funds, the Company's share of the earnings or losses is 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 13 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. Since equity securities do not have a contractual cash flow or a maturity, the Company considers whether the price of an equity security is expected to recover within a reasonable period of time.

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.,thepresent 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.

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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. Diluted EPS is based upon the weighted average number of common 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. Stock options for which the exercise price exceeds the average market price over the period have an anti-dilutive effect on EPS and, accordingly, are excluded from the calculation.

(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 for each of their major lines of business. 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 14 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 $54 million and $68 million at December 31, 2015 and 2014, respectively.

(J) Federal and foreign income taxes

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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 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 $45 million, $44 million and $38 million for 2015, 2014 and 2013, 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, unrealized foreign currency translation adjustments and changes in unrecognized pension obligations.

(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, 2015 indicated that there were no impairment losses related to goodwill and other intangible assets. Intangible assets of $94 million and $96 million are included in other assets as of December 31, 2015 and 2014, respectively.

(O) Stock options

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 $130 million, $120 million and $125 million in 2015, 2014 and 2013, respectively. Income taxes paid were $165 million, $314 million and $186 million in 2015, 2014 and 2013, respectively. Other non-cash items include acquisitions, unrealized investment gains and losses and pension expense. (See Note 2, Note 11 and Note 25 of Notes to Consolidated Financial Statements.)

(Q) Recent accounting pronouncements

The accounting and reporting standards that became effective in 2015 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 May 2014, the Financial Accounting Standards  Board (FASB) issued Accounting Standards Update (ASU) 2014-09, Revenue from Customers.  ASU 2014-09 clarifies the principles for recognizing revenue.  While insurance contracts

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are not within the scope of this updated guidance, the Company’s insurance service fee revenue will be 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, is effective for public business entities for annual and interim reporting periods beginning after December 15, 2017.  The adoption of this guidance is not expected to have a material effect on the Company’s financial condition or results of operations.

In February 2015, the FASB issued ASU 2015-02, Consolidation.  ASU 2015-02 makes targeted amendments to the current consolidation accounting guidance, in response to accounting complexity concerns. The guidance simplifies consolidation accounting by reducing the number of approaches to consolidation.  The updated guidance is effective for annual and interim reporting periods beginning after December 15, 2015. The adoption of this guidance is not expected to have a material effect on the Company’s financial condition or results of operations, but will result in additional disclosures.

In May 2015, the FASB issued ASU 2015-09, Disclosures about Short-Duration Contracts.   ASU 2015-09 requires companies that issue short duration insurance contracts to disclose additional information, including: (i) incurred and paid claims development tables; (ii) frequency and severity of claims; and (iii) information about material changes in judgments made in calculating the liability for unpaid claim adjustment expenses, including reasons for the change and the effects on the financial statements. ASU 2015-09 is effective for annual periods beginning after December 15, 2015, and interim periods within annual periods beginning after December 15, 2016. The amendments in ASU 2015-09 should be applied retrospectively by providing comparative disclosures for each period presented, except for those requirements that apply only to the current period. As the requirements of this literature are disclosure only, the adoption of this guidance will not impact our financial condition or results of operations.

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 to be 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).  The updated guidance is effective for public business entities for annual reporting periods beginning after December 15, 2017 and interim periods within those years.  The adoption of this guidance is not expected to have a material effect on the Company’s financial condition upon adoption, but will impact results of operations after adoption of this guidance as unrealized gains and losses on equity securities will no longer be reported directly in AOCI, but will instead be reported in net income.

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) Acquisitions / Dispositions

In 2015, the Company acquired an aviation systems company for $8 million.

In 2014, the Company acquired a specialty property and casualty insurance distribution company for $83 million. The fair values of the assets acquired and liabilities assumed have been estimated based on a valuation prepared by a third party. The estimated useful lives of the intangible assets acquired range from 7 years to 15 years, with approximately $10 million having an indefinite life.

In 2014, the Company sold an aviation-related business for $16 million. The business had a net carrying value of $15 million, comprised of $7 million of goodwill, $6 million of other assets, $4 million of furniture and equipment and $2 million of liabilities.

The following table summarizes the estimated fair value of net assets acquired and liabilities assumed for the business combination completed in 2014:    

(In thousands)	2014
Cash and cash equivalents	$	17,457
Real estate, furniture and equipment	669
Goodwill and other intangibles assets	79,646
Premium and service fee receivable	24,432
Other assets	2,590
Total assets acquired	124,794
Deferred federal income tax	(7,107		)
Debt	—
Other liabilities assumed	(34,809		)
Net assets acquired	$	82,878

(3) Consolidated Statement of Comprehensive Income (Loss)

The following table presents the components of the changes in accumulated other comprehensive income (loss) (AOCI) as of and for the year ended December 31, 2015:

(In thousands)	Unrealized investment gains (losses)				Currency translation adjustments			Net pension asset		Accumulated other comprehensive income (loss)
Changes in AOCI
Beginning of period	$	306,199			$	(122,649	)	$	—	$	183,550
Other comprehensive income (loss) before reclassifications	(119,994		)		(124,744		)	—		(244,738		)
Amounts reclassified from AOCI	(5,548		)		—			—		(5,548		)
Other comprehensive income (loss)	(125,542		)		(124,744		)	—		(250,286		)
Unrealized investment gain related to non-controlling interest	38				—			—		38
Ending balance	$	180,695			$	(247,393	)	$	—	$	(66,698	)
Amounts reclassified from AOCI
Pre-tax	$	(8,535	)	(1)	$	—		$	—	$	(8,535	)
Tax effect	2,987			(2)	—			—		2,987
After-tax amounts reclassified	$	(5,548	)		$	—		$	—	$	(5,548	)
Other comprehensive income (loss)
Pre-tax	$	(192,186	)		$	(124,744	)	$	—	$	(316,930	)
Tax effect	66,644				—			—		66,644
Other comprehensive income (loss)	$	(125,542	)		$	(124,744	)	$	—	$	(250,286	)

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The following table presents the components of the changes in accumulated other comprehensive income (loss) (AOCI) as of and for the year ended December 31, 2014:

(In thousands)	Unrealized investment gains (losses)				Currency translation adjustments			Net pension asset				Accumulated other comprehensive income (loss)
Changes in AOCI
Beginning of period	$	256,566			$	(60,524	)	$	(6,651	)		$	189,391
Other comprehensive income (loss) before reclassifications	98,294				(62,125		)	—				36,169
Amounts reclassified from AOCI	(48,628		)		—			6,651				(41,977		)
Other comprehensive income (loss)	49,666				(62,125		)	6,651				(5,808		)
Unrealized investment gain related to non-controlling interest	(33		)		—			—				(33		)
Ending balance	$	306,199			$	(122,649	)	$	—			$	183,550
Amounts reclassified from AOCI
Pre-tax	$	(74,812	)	(1)	$	—		$	10,232		(3)	$	(64,580	)
Tax effect	26,184			(2)	—			(3,581		)	(2)	22,603
After-tax amounts reclassified	$	(48,628	)		$	—		$	6,651			$	(41,977	)
Other comprehensive income (loss)
Pre-tax	$	72,889			$	(62,125	)	$	10,232			$	20,996
Tax effect	(23,223		)		—			(3,581		)		(26,804		)
Other comprehensive income (loss)	$	49,666			$	(62,125	)	$	6,651			$	(5,808	)

_______________

(1) Net investment gains in the consolidated statements of income.

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

(3) Other operating costs and expenses in the consolidated statements of income.

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(4) Investments in Fixed Maturity Securities

At December 31, 2015 and 2014, investments in fixed maturity securities were as follows:

(In thousands)	Amortized Cost		Gross Unrealized					Fair Value		Carrying Value
			Gains		Losses
December 31, 2015
Held to maturity:
State and municipal	$	77,129	$	16,246	$	—		$	93,375	$	77,129
Residential mortgage-backed	19,138		2,207		—			21,345		19,138
Corporate	—		—		—			—		—
Total held to maturity	96,267		18,453		—			114,720		96,267
Available for sale:
U.S. government and government agency	645,092		27,660		(2,333		)	670,419		670,419
State and municipal:
Special revenue	2,510,816		102,909		(3,737		)	2,609,988		2,609,988
State general obligation	583,456		28,068		(2,070		)	609,454		609,454
Pre-refunded	439,772		32,056		(31		)	471,797		471,797
Corporate backed	388,904		14,039		(402		)	402,541		402,541
Local general obligation	342,158		24,270		(29		)	366,399		366,399
Total state and municipal	4,265,106		201,342		(6,269		)	4,460,179		4,460,179
Mortgage-backed securities:
Residential (1)	1,126,382		18,935		(11,180		)	1,134,137		1,134,137
Commercial	64,975		875		(128		)	65,722		65,722
Total mortgage-backed securities	1,191,357		19,810		(11,308		)	1,199,859		1,199,859
Asset-backed securities	1,706,694		12,892		(14,414		)	1,705,172		1,705,172
Corporate:
Industrial	1,976,393		75,168		(30,027		)	2,021,534		2,021,534
Financial	1,153,096		31,744		(11,819		)	1,173,021		1,173,021
Utilities	192,857		8,321		(2,527		)	198,651		198,651
Other	81,607		245		(20		)	81,832		81,832
Total corporate	3,403,953		115,478		(44,393		)	3,475,038		3,475,038
Foreign	799,839		50,310		(12,689		)	837,460		837,460
Total available for sale	12,012,041		427,492		(91,406		)	12,348,127		12,348,127
Total investments in fixed maturity securities	$	12,108,308	$	445,945	$	(91,406	)	$	12,462,847	$	12,444,394

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(In thousands)	Amortized Cost		Gross Unrealized					Fair Value		Carrying Value
			Gains		Losses
December 31, 2014
Held to maturity:
State and municipal	$	72,901	$	17,501	$	—		$	90,402	$	72,901
Residential mortgage-backed	23,278		2,854		—			26,132		23,278
Corporate	4,998		291		—			5,289		4,998
Total held to maturity	101,177		20,646		—			121,823		101,177
Available for sale:
U.S. government and government agency	773,192		33,353		(3,157		)	803,388		803,388
State and municipal:
Special revenue	2,264,210		111,841		(2,084		)	2,373,967		2,373,967
State general obligation	674,022		37,615		(787		)	710,850		710,850
Pre-refunded	504,778		35,619		(289		)	540,108		540,108
Corporate backed	413,234		18,976		(855		)	431,355		431,355
Local general obligation	281,622		25,099		(5		)	306,716		306,716
Total state and municipal	4,137,866		229,150		(4,020		)	4,362,996		4,362,996
Mortgage-backed securities:
Residential (1)	1,201,924		27,124		(9,449		)	1,219,599		1,219,599
Commercial	74,479		1,610		(52		)	76,037		76,037
Total mortgage-backed securities	1,276,403		28,734		(9,501		)	1,295,636		1,295,636
Asset-backed securities	2,019,032		18,868		(11,974		)	2,025,926		2,025,926
Corporate:
Industrial	1,606,724		117,206		(5,131		)	1,718,799		1,718,799
Financial	1,140,801		38,080		(7,673		)	1,171,208		1,171,208
Utilities	184,107		12,436		(1		)	196,542		196,542
Other	86,294		1,370		(2		)	87,662		87,662
Total corporate	3,017,926		169,092		(12,807		)	3,174,211		3,174,211
Foreign	897,668		62,223		(18,065		)	941,826		941,826
Total available for sale	12,122,087		541,420		(59,524		)	12,603,983		12,603,983
Total investments in fixed maturity securities	$	12,223,264	$	562,066	$	(59,524	)	$	12,725,806	$	12,705,160

(1) Gross unrealized losses for mortgage-backed securities include $1,269,491 and $1,095,671, as of December 31, 2015 and 2014, 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, 2015, 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	$	711,642	$	717,075
Due after one year through five years	4,056,450		4,185,436
Due after five years through ten years	3,653,308		3,795,614
Due after ten years	2,476,413		2,543,518
Mortgage-backed securities	1,210,495		1,221,204
Total	$	12,108,308	$	12,462,847

At December 31, 2015 and 2014, 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, 2015, investments with a carrying value of $1,201 million were on deposit in custodial or trust accounts, of which $963 million was on deposit with state insurance departments, $182 million was on deposit in support of the Company’s underwriting activities at Lloyd’s, $41 million was on deposit as security for reinsurance clients and $15 million was on deposit as security for letters of credit issued in support of the Company’s reinsurance operations.

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(5) Investments in Equity Securities Available for Sale

At December 31, 2015 and 2014, investments in equity securities available for sale were as follows:

(In thousands)	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Carrying Value
December 31, 2015
Common stocks	$	56,462	$	—	$	(19,189	)	$	37,273	$	37,273
Preferred stocks	108,730		8,216		(3,353		)	113,593		113,593
Total	$	165,192	$	8,216	$	(22,542	)	$	150,866	$	150,866
December 31, 2014
Common stocks	$	69,870	$	11,929	$	(5,453	)	$	76,346	$	76,346
Preferred stocks	90,425		8,385		(4,165		)	94,645		94,645
Total	$	160,295	$	20,314	$	(9,618	)	$	170,991	$	170,991

(6) Arbitrage Trading Account

At December 31, 2015 and 2014, the fair value and carrying value of the arbitrage trading account were $377 million and $451 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, 2015, the fair value of long option contracts outstanding was $3 million (notional amount of $52 million) and the fair value of short option contracts outstanding was $1 million (notional amount of $62 million). Other than with respect to the use of these trading account securities, the Company does not make use of derivatives.

(7) Net Investment Income

Net investment income consists of the following:

(In thousands)	2015			2014			2013
Investment income earned on:
Fixed maturity securities, including cash and cash equivalents and loans receivable	$	428,325		$	439,489		$	442,287
Equity securities available for sale	4,624			6,726			11,380
Investment funds	62,228			131,649			67,712
Arbitrage trading account	16,891			22,438			20,431
Real estate	11,294			10,228			12,498
Gross investment income	523,362			610,530			554,308
Investment expense	(10,717		)	(9,645		)	(10,017		)
Net investment income	$	512,645		$	600,885		$	544,291

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(8) Investment Funds

Investment funds consist of the following:

	Carrying Value as of December 31,				Income (Losses)
(In thousands)	2015		2014		2015			2014		2013
Real estate	$	580,830	$	466,703	$	58,032		$	26,233	$	9,315
Energy	93,719		152,056		(37,373		)	12,797		29,739
Hedged equity	70,580		282,335		(2,762		)	10,760		7,655
Other funds	424,911		310,307		44,331			81,859		21,003
Total	$	1,170,040	$	1,211,401	$	62,228		$	131,649	$	67,712

Other funds include private equity investments carried on the equity method of accounting, which includes a publicly traded common stock investment in HealthEquity, Inc. (HQY). Our ownership interest in HQY as of December 31, 2015 is approximately 21% with a fair value of $300.1 million and a carrying value of $45.4 million.

(9) Real Estate

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

	As of December 31,
(In thousands)	2015		2014
Properties in operation	$	226,055	$	196,980
Properties under development	710,312		534,632
Total	$	936,367	$	731,612

In 2015, properties in operation included a long-term ground lease in Washington, D.C. and office buildings in West Palm Beach and Palm Beach, Florida. Properties in operation are net of accumulated depreciation and amortization of $9,073,000 and $1,609,000 as of December 31, 2015 and 2014, respectively. Related depreciation expense was $7,425,000 and $4,808,000 for the years ended December 31, 2015 and 2014, respectively. Future minimum rental income expected on operating leases relating to properties in operation is $13,141,756 in 2016, $15,483,248 in 2017, $14,623,307 in 2018, $11,967,190 in 2019, $9,584,128 in 2020 and $352,328,662 thereafter.

Properties under development represent the following: an office building in London, a mixed-use project in Washington D.C. and an office complex in New York City.

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(10) Loans Receivable

Loans receivable are as follows:

	As of December 31,
(In thousands)	2015			2014
Amortized cost:
Real estate loans	$	200,499		$	243,407
Commercial loans	72,604			78,605
Total	$	273,103		$	322,012
Fair value:
Real estate loans	$	201,641		$	245,112
Commercial loans	74,106			80,107
Total	$	275,747		$	325,219
Valuation allowance:
Specific	$	—		$	115
General	2,094			2,371
Total	$	2,094		$	2,486
	For the Year Ended December 31,
	2015			2014
(Decrease) increase in valuation allowance	$	(392	)	$	398

Loans receivable in non-accrual status were $3.1 million and $14.2 million as of December 31, 2015 and 2014, respectively, primarily resulting from the sale of such loans.

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 Arizona, Maryland, New York and Tennessee. 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. These loans generally earn interest on a fixed basis and have varying maturities not exceeding 10 years.

The Company utilizes a risk rating system to assign a risk to each of its real estate loans. The loan rating system takes into consideration 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 Company’s position in the capital structure, and the overall leverage in the capital structure. Based on this rating system, none of the real estate loans were considered tobe impaired at December 31, 2015, and accordingly, the Company determined that a specific valuation allowance was not required.

(11) Realized and Unrealized Investment Gains and Losses

Realized and unrealized investment gains and losses are as follows:

(In thousands)	2015			2014			2013
Realized investment gains and losses:
Fixed maturity securities:
Gains	$	23,755		$	39,113		$	48,860
Losses	(4,065		)	(4,420		)	(14,670		)
Equity securities available for sale	9,639			38,296			70,235
Investment funds	93,529			96,204			10,976
Real estate	—			85,659			—
Other gains	2,775			—			12,185
Net realized gains on investments sales	125,633			254,852			127,586
Net other-than-temporary impairments:
Other-than-temporary impairments	(33,309		)	—			(6,042		)
Net other-than-temporary impairments	(33,309		)	—			(6,042		)
Total net investment gains	92,324			254,852			121,544
Income tax expense	(32,313		)	(89,198		)	(47,426		)
After-tax realized investment gain and losses	$	60,011		$	165,654		$	74,118

Change in unrealized gains and losses of available for sales securities:
Fixed maturity securities	$	(144,445	)	$	155,765		$	(401,812	)
Previously impaired fixed maturity securities	(174		)	865			1,076
Equity securities available for sale	(27,809		)	(69,016		)	11,864
Investment funds	(19,758		)	(14,725		)	(10,250		)
Total change in unrealized gains	(192,186		)	72,889			(399,122		)
Income tax benefit (expense)	66,644			(23,223		)	138,058
Noncontrolling interests	38			(33		)	(28		)
After-tax change in unrealized investment gain and losses of available for sale securities	$	(125,504	)	$	49,633		$	(261,092	)

OTTI recognized in earnings were $33.3 million and $6 million for the years ended December 31, 2015 and December 31, 2013, respectively. There were no OTTI for the year ended December 31, 2014. For the year ended December 31, 2015, OTTI related to equity securities were $24.3 million and related to fixed maturity securities were $9 million. For the year ended December 31, 2013, OTTI related to equity securities.

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(12) Securities in an Unrealized Loss Position

The following table summarizes all securities in an unrealized loss position at December 31, 2015 and 2014 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, 2015
U.S. government and government agency	$	101,660	$	487	$	64,500	$	1,846	$	166,160	$	2,333
State and municipal	501,952		4,404		106,681		1,865		608,633		6,269
Mortgage-backed securities	381,986		3,639		184,807		7,669		566,793		11,308
Asset-backed securities	1,091,078		7,703		190,467		6,711		1,281,545		14,414
Corporate	1,232,940		35,406		76,797		8,987		1,309,737		44,393
Foreign government	169,190		8,822		19,528		3,867		188,718		12,689
Fixed maturity securities	3,478,806		60,461		642,780		30,945		4,121,586		91,406
Common stocks	18,641		18,005		7,829		1,184		26,470		19,189
Preferred stocks	—		—		22,320		3,353		22,320		3,353
Equity securities available for sale	18,641		18,005		30,149		4,537		48,790		22,542
Total	$	3,497,447	$	78,466	$	672,929	$	35,482	$	4,170,376	$	113,948
December 31, 2014
U.S. government and government agency	$	84,750	$	522	$	84,850	$	2,635	$	169,600	$	3,157
State and municipal	158,594		631		150,284		3,389		308,878		4,020
Mortgage-backed securities	75,739		332		312,922		9,169		388,661		9,501
Asset-backed securities	1,186,097		6,217		30,818		5,757		1,216,915		11,974
Corporate	400,141		2,480		183,810		10,327		583,951		12,807
Foreign government	76,471		3,907		85,025		14,158		161,496		18,065
Fixed maturity securities	1,981,792		14,089		847,709		45,435		2,829,501		59,524
Common stocks	15,929		5,453		—		—		15,929		5,453
Preferred stocks	27,126		1,139		22,648		3,026		49,774		4,165
Equity securities available for sale	43,055		6,592		22,648		3,026		65,703		9,618
Total	$	2,024,847	$	20,681	$	870,357	$	48,461	$	2,895,204	$	69,142

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, 2015 is presented in the table below:

(Dollars in thousands)	Number of Securities	Aggregate Fair Value		Gross Unrealized Loss
Mortgage-backed securities	8	$	23,370	$	1,790
Asset-backed securities	7	19,535		264
Corporate	12	128,716		6,717
Foreign government	1	13,956		3,766
Total	28	$	185,577	$	12,537

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.

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For the year ended December 31, 2015, OTTI for fixed maturities recognized in earnings were $9.0 million, all of which was considered due to credit factors. There were no OTTI of fixed maturity securities for the year ended December 31, 2014.

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.

Preferred Stocks – At December 31, 2015, there was one preferred stock in an unrealized loss position, with an aggregate fair value of $22.3 million and a gross unrealized loss of $3.4 million. The preferred stock is rated investment grade. Management believes the unrealized loss is due primarily to market and sector related factors and does not consider it to be OTTI. For the year ended December 31, 2015, OTTI for preferred stocks were $13.4 million. There were no OTTI of preferred stocks for the year ended December 31, 2014.

Common Stocks – At December 31, 2015, there were two common stocks in an unrealized loss position, with an aggregate fair value of $26.5 million and a gross unrealized loss of $19.2 million. Based on management's view on the underlying securities, the Company does not consider the common stocks to be OTTI. For the year ended December 31, 2015, OTTI for common stocks were $10.9 million. There were no OTTI of common stocks for the year ended December 31, 2014.

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 $2 million and $3 million at December 31, 2015 and 2014, respectively.

(13) 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.

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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 on a recurring basis as of December 31, 2015 and 2014 by level:

(In thousands)	Total		Level 1		Level 2		Level 3
December 31, 2015
Assets:
Fixed maturity securities available for sale:
U.S. government and government agency	$	670,419	$	—	$	670,419	$	—
State and municipal	4,460,179		—		4,460,179		—
Mortgage-backed securities	1,199,859		—		1,199,859		—
Asset-backed securities	1,705,172		—		1,704,973		199
Corporate	3,475,038		—		3,474,884		154
Foreign government	837,460		—		837,460		—
Total fixed maturity securities available for sale	12,348,127		—		12,347,774		353
Equity securities available for sale:
Common stocks	37,273		29,444		—		7,829
Preferred stocks	113,593		—		109,969		3,624
Total equity securities available for sale	150,866		29,444		109,969		11,453
Arbitrage trading account	376,697		256,914		119,607		176
Total	$	12,875,690	$	286,358	$	12,577,350	$	11,982
Liabilities:
Trading account securities sold but not yet purchased	$	37,035	$	35,559	$	1,476	$	—
December 31, 2014
Assets:
Fixed maturity securities available for sale:
U.S. government and government agency	$	803,388	$	—	$	803,388	$	—
State and municipal	4,362,996		—		4,362,996		—
Mortgage-backed securities	1,295,636		—		1,295,636		—
Asset-backed securities	2,025,926		—		2,005,315		20,611
Corporate	3,174,211		—		3,174,057		154
Foreign government	941,826		—		941,826		—
Total fixed maturity securities available for sale	12,603,983		—		12,583,218		20,765
Equity securities available for sale:
Common stocks	76,346		65,605		—		10,741
Preferred stocks	94,645		—		90,932		3,713
Total equity securities available for sale	170,991		65,605		90,932		14,454
Arbitrage trading account	450,648		295,047		154,881		720
Total	$	13,225,622	$	360,652	$	12,829,031	$	35,939
Liabilities:
Trading account securities sold but not yet purchased	$	106,079	$	106,074	$	5	$	—

There were no significant transfers between Levels 1 and 2 for the years ended December 31, 2015 and 2014.

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The following tables summarize changes in Level 3 assets and liabilities for the years ended December 31, 2015 and 2014:

	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, 2015
Assets:
Fixed maturity securities available for sale:
Asset-backed securities	$	20,611	$	19		$	191		$	—		$	—	$	—		$	(1,820	)	$	(18,802	)	$	199
Corporate	154		—			—			—			—		—			—			—			154
Total	20,765		19			191			—			—		—			(1,820		)	(18,802		)	353
Equity securities available for sale:
Common stocks	10,741		—			(273		)	(2,331		)	—		(308		)	—			—			7,829
Preferred stocks	3,713		(89		)	—			—			—		—			—			—			3,624
Total	14,454		(89		)	(273		)	(2,331		)	—		(308		)	—			—			11,453
Arbitrage trading account	720		(799		)	—			—			72,640		(71,921		)	—			(464		)	176
Total	$	35,939	$	(869	)	$	(82	)	$	(2,331	)	$	72,640	$	(72,229	)	$	(1,820	)	$	(19,266	)	$	11,982
Liabilities:
Trading account securities sold but not yet purchased	$	—	$	—		$	—		$	—		$	—	$	—		$	—		$	—		$	—
Year ended December 31, 2014
Assets:
Fixed maturity securities available for sale:
Asset-backed securities	$	42,710	$	47		$	(3,711	)	$	—		$	238	$	(15,244	)	$	(3,429	)	$	—		$	20,611
Corporate	$	154	$	—		$	—		$	—		$	—	$	—		$	—		$	—		$	154
Total	42,864		47			(3,711		)	—			238		(15,244		)	(3,429		)	—			20,765
Equity securities available for sale:
Common stocks	1,238		—			(911		)	—			11,343		(929		)	—			—			10,741
Preferred stocks	3,752		(17		)	—			—			3,430		(3,452		)	—			—			3,713
Total	4,990		(17		)	(911		)	—			14,773		(4,381		)	—			—			14,454
Arbitrage trading account	1,780		2,274			—			—			4,942		(14,073		)	—			5,797			720
Total	$	49,634	$	2,304		$	(4,622	)	$	—		$	19,953	$	(33,698	)	$	(3,429	)	$	5,797		$	35,939
Liabilities:
Trading account securities sold but not yet purchased	$	—	$	(20	)	$	—		$	—		$	31	$	(11	)	$	—		$	—		$	—

During the year ended December 31, 2015, five securities were transferred out of Level 3 as an observable price was available. During the year ended December 31, 2014, two securities were transferred into Level 3 as quoted prices were no longer available.

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(14) Reserves for Losses and Loss Expenses

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

(In thousands)	2015			2014			2013
Net reserves at beginning of year	$	8,970,641		$	8,683,797		$	8,411,851
Net provision for losses and loss expenses:
Claims occuring during the current year(1)	3,653,561			3,495,825			3,221,393
Decrease in estimates for claims occurring in prior years(2)(3)	(46,713		)	(75,764		)	(78,810		)
Loss reserve discount accretion(4)	49,422			70,506			54,441
Total	3,656,270			3,490,567			3,197,024
Net payments for claims:
Current year	914,637			898,944			822,787
Prior year	2,342,378			2,216,283			2,055,284
Total	3,257,015			3,115,227			2,878,071
Foreign currency translation	(125,024		)	(88,496		)	(47,007		)
Net reserves at end of year	9,244,872			8,970,641			8,683,797
Ceded reserve at end of year	1,424,278			1,399,060			1,397,144
Gross reserves at end of year	$	10,669,150		$	10,369,701		$	10,080,941

_______________________________________

(1) Claims occurring during the current year are net of loss reserve discounts of $20,357,000, $21,306,000, and $22,680,000 in 2015, 2014 and 2013, respectively.

(2) The 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 $64,971,000, $116,866,000 and $77,430,000 in 2015, 2014 and 2013, respectively.

(3) For certain retrospectively rated insurance polices and reinsurance agreements, reserve development is offset by additional or return premiums. Favorable reserve development, net of additional and return premiums, was $63 million, $85 million and $98 million in 2015, 2014 and 2013, respectively.

(4) In 2014, the Company entered into a commutation agreement that resulted in a reduction in prior year workers' compensation reserves of $30 million on an undiscounted basis and $12 million on a discounted basis.

Favorable prior year development (net of additional and return premiums) was $63 million in 2015.

Insurance-Domestic - Reserves for the Insurance-Domestic segment developed favorably by $47 million in 2015. The favorable development was primarily related to workers' compensation and other liability business, and was partially offset by unfavorable development for commercial automobile 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 2006. In 2015, reported workers' compensation losses were below our expectations for many of our operating units. In addition, overall loss frequency and severity trends emerged better than the assumptions underlying our previous reserve estimates. The long term trend of declining workers' compensation claim frequency continued in 2015. The improvement is attributable to better workplace safety and to benign medical severity trends as we continue to invest in medical case management services and higher usage of preferred provider networks.

For other liability business, favorable development was concentrated in accident years 2007 through 2013. The favorable development was primarily related to our excess and surplus lines casualty business that has benefited from a persistent improvement in claim frequency trends over the past several years.

For commercial automobile business, adverse development was primarily related to large losses for long-haul trucking business and to accident years 2011 through 2014. The higher loss cost trends for the commercial automobile industry are attributable, in part, to the increase in miles driven as the economy has improved and fuel prices have declined over the past several years.

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Reinsurance-Global - Reserves for the Reinsurance-Global segment developed favorably by $11 million in 2015. The favorable development was primarily related to direct facultative reinsurance business and to accident years 2005 through 2013. Loss reserves developed favorably for umbrella business and for other liability coverage for contractors.

Insurance-International - Reserves for the Insurance-International segment developed favorably by $5 million in 2015. The favorable development was related primarily to commercial property. The favorable commercial property development was attributable to accident years 2012 through 2014 and was driven by favorable frequency and severity trends on property business written in Lloyd's. The favorable property development was partially offset by unfavorable development for professional indemnity business in the U.K., primarily for accident years 2006 through 2013.

Favorable prior year development (net of additional and return premiums) was $85 million in 2014.

For the Insurance-Domestic segment, favorable development in 2014 of $92 million was driven primarily by other liability business for accident years 2006 through 2010, primarily related to our excess and surplus lines casualty business. Reported losses during these years continued to be below our initial expectations at the time the business was written, largely as a result of persistent improvement in claim frequency trends (i.e., number of reported claims per unit of exposure). As these accident years have matured, the weighting of actuarial methods has shifted from methods based on initial expected losses to methods based on actual reported losses. We believe the favorable claim frequency trends we have seen during this time period are due to changes in the mix of business written and to the general slowdown in the economy. Commercial automobile reported unfavorable development primarily as a result of large losses for long-haul trucking business in 2012 and 2013.

For the Reinsurance-Global segment, favorable reserve development in 2014 of $16 million was driven primarily by assumed professional liability excess of loss and umbrella treaty business, as well as direct facultative business. This was partially offset by adverse development on brokerage facultative business caused by completed operations losses associated with construction projects in accident years prior to 2009.

For the Insurance-International segment, adverse reserve development in 2014 of $23 million was driven primarily by unexpected large losses from accident years 2009-2012 in the professional indemnity line of business in the United Kingdom.

Favorable prior year reserve development (net of additional and return premiums) was $98 million in 2013.

Favorable development in 2013 was primarily attributable to accident years 2006 through 2012 and included favorable development of $39 million for other liability business, $32 million for reinsurance assumed liability business, $22 million for workers’ compensation, $18 million for commercial property and $24 million for other lines of business. The favorable development in 2013 was largely driven by loss cost trends, which were more favorable than originally anticipated. In particular, loss frequency trends have been more favorable than expected for excess & surplus lines casualty business, workers' compensation and excess of loss professional and other liability business.

The 2013 favorable development was partially offset by unfavorable development of $23 million for commercial automobile business and $14 million for products liability business. Commercial automobile development was driven by large losses for long-haul trucking business in 2011 and 2012. Product liability development stemmed from completed operations losses associated with construction projects in accident years prior to 2009.

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 was $33 million at December 31, 2015 and $36 million at December 31, 2014. The Company’s gross reserves for losses and loss expenses relating to asbestos and environmental claims were $51 million and $56 million at December 31, 2015 and 2014, respectively. Net incurred losses and loss expenses for reported asbestos and environmental claims decreased approximately $2 million in 2015 and increased by approximately $4 million and $5 million in 2014 and 2013, respectively. Net paid losses and loss expenses for asbestos and environmental claims were approximately $2 million in 2015, $3 million in 2014 and $3 million in 2013. 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 $2,308 million and $2,187 million at December 31, 2015 and

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December 31, 2014, respectively. The aggregate net discount for those reserves, after reflecting the effects of ceded reinsurance, was $699 million and $746 million at December 31, 2015 and December 31, 2014, respectively. At December 31, 2015, discount rates by year ranged from 2.0% to 6.5%, with a weighted average discount rate of 3.9%.

Substantially all of discounted workers’ compensation reserves (98% of total discounted reserves at December 31, 2015) 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 2% of total discounted reserves at December 31, 2015), 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.

(15) 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)	2015			2014			2013
Written premiums:
Direct	$	6,412,533		$	6,185,242		$	5,626,172
Assumed	837,460			877,596			884,919
Ceded	(1,060,478		)	(1,065,891		)	(1,010,918		)
Total net written premiums	$	6,189,515		$	5,996,947		$	5,500,173
Earned premiums:
Direct	$	6,245,714		$	5,889,021		$	5,328,955
Assumed	845,735			886,063			857,119
Ceded	(1,050,840		)	(1,030,666		)	(959,537		)
Total net earned premiums	$	6,040,609		$	5,744,418		$	5,226,537
Ceded losses and loss expenses incurred	$	501,999		$	475,802		$	556,108
Ceded commission earned	$	129,766		$	160,215		$	137,449

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 $1,020,000, $1,144,000 and $1,385,000 as of December 31, 2015, 2014 and 2013, respectively.

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The following table presents the amounts due from reinsurers as of December 31, 2015:

(In thousands)
Allegany Group	$	138,163
Munich Re	121,661
Swiss Re	115,215
Lloyd’s of London	92,635
Axis Capital	69,840
Partner Re	65,793
Hannover Re Group	48,675
Everest Re	47,945
Berkshire Hathaway	47,309
Chubb Limited (1)	45,645
Arch Capital Group	23,273
Other reinsurers less than $20,000	213,169
Subtotal	1,029,323
Residual market pools	503,506
Total	$	1,532,829

(1) Includes the aggregate recoverables from Ace Group and Chubb Group.

(16) Indebtedness

Indebtedness consisted of the following as of December 31, 2015 (the difference between the face value and the carrying value is unamortized discount):

(In thousands)	Interest Rate	Face Value		2015 Carrying Value		2014 Carrying Value
Senior notes due on:
May 15, 2015	5.6%	$	—	$	—	$	199,930
August 15, 2019	6.15%	150,000		149,484		149,342
September 15, 2019	7.375%	300,000		299,054		298,800
September 15, 2020	5.375%	300,000		298,411		298,074
January 1, 2022	8.7%	76,503		76,097		76,048
March 15, 2022	4.625%	350,000		347,417		346,999
February 15, 2037	6.25%	250,000		247,676		247,566
August 1, 2044	4.75%	350,000		344,730		344,545
Subsidiary debt (1)	Various	81,752		81,752		154,223
Total senior notes and other debt		$	1,858,255	$	1,844,621	$	2,115,527
Subordinated debentures, due on April, 30, 2053	5.625%	$	350,000	$	340,320	$	340,060

_____________

(1) Subsidiary debt is due as follows: $43 million in 2016, $37 million in 2017 and $2 million thereafter.

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(17) Income Taxes

Income tax expense consists of:

(In thousands)	Current Expense			Deferred Expense		Total
December 31, 2015
Domestic	$	179,150		$	31,145	$	210,295
Foreign	(2,318		)	19,946		17,628
Total expense	$	176,832		$	51,091	$	227,923
December 31, 2014
Domestic	$	258,337		$	28,029	$	286,366
Foreign	12,969			3,258		16,227
Total expense	$	271,306		$	31,287	$	302,593
December 31, 2013
Domestic	$	116,802		$	47,370	$	164,172
Foreign	22,362			7,053		29,415
Total expense	$	139,164		$	54,423	$	193,587

Income before income taxes from domestic operations was $689 million, $910 million and $598 million for the years ended December 31, 2015, 2014 and 2013, respectively. Income before income taxes from foreign operations was $43 million, $42 million and $101 million for the years ended December 31, 2015, 2014 and 2013, respectively.

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

(In thousands)	2015			2014			2013
Computed “expected” tax expense	$	256,210		$	333,269		$	244,611
Tax-exempt investment income	(39,283		)	(38,757		)	(40,679		)
Change in valuation allowance	2,702			1,335			—
Impact of foreign tax rates	4,447			6,239			(4,851		)
State and local taxes	940			2,375			2,906
Other, net	2,907			(1,868		)	(8,400		)
Total expense	$	227,923		$	302,593		$	193,587

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At December 31, 2015 and 2014, 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)	2015			2014
Deferred tax asset:
Loss reserve discounting	$	100,806		$	77,216
Unearned premiums	176,465			165,075
Other-than-temporary impairments	26,509			45,367
Restricted stock units	62,442			60,061
Other	89,761			101,131
Gross deferred tax asset	455,983			448,850
Less valuation allowance	(4,037		)	(1,335		)
Deferred tax asset	451,946			447,515
Deferred tax liability:
Amortization of intangibles	20,316			22,747
Deferred policy acquisition costs	162,344			152,001
Unrealized investment gains	115,499			175,111
Other	160,598			135,108
Deferred tax liability	458,757			484,967
Net deferred tax asset (liability)	$	(6,811	)	$	(37,452	)

The Company had current tax receivables of $55,763,000 and $67,623,000 at December 31, 2015 and 2014, respectively. At December 31, 2015, the Company had foreign net operating loss carryforwards $6.1 million that expire beginning in 2031, and an additional $43.2 million that have no expiration date. At December 31, 2015, the Company had a valuation allowance of $4.0 million, as compared to $1.3 million at December 31, 2014. The Company has provided a valuation allowance against future tax benefits of certain foreign operations. The statute of limitations has closed for the Company’s tax returns through December 31, 2011.

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.

(18) 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 2016, the maximum amount of dividends that can be paid by BIC without such approval is approximately $684 million.

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

(In thousands)	2015		2014		2013
Net income	$	813,303	$	757,010	$	468,850
Statutory capital and surplus	$	5,296,435	$	5,438,063	$	4,908,010

The significant variances between SAP and GAAP are that for statutory purposes bonds are carried at amortized cost, 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 to increase BIC’s statutory capital and surplus by $294 million at December 31, 2015.

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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, 2015, BIC’s Total Adjusted Capital of $5.002 billion was 456% of its RBC Authorized Control Level.

See Note 4, Investments in Fixed Maturity Securities, for a description of assets held on deposit as security.

(19) Common Stockholders’ Equity

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

	2015	2014	2013
Basic	124,040,313	127,873,708	135,304,752
Diluted	130,188,866	133,651,855	140,742,922

Treasury shares have been excluded from average outstanding shares from the date of acquisition. 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 and unexercised stock options.

	2015		2014		2013
Balance, beginning of year	126,748,836		132,233,167		136,017,732
Shares issued	1,061,026		332,137		139,790
Shares repurchased	(4,502,025	)	(5,816,468	)	(3,924,355)
Balance, end of year	123,307,837		126,748,836		132,233,167

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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(20) 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, 2015 and 2014:

	2015				2014
(In thousands)	Carrying Value		Fair Value		Carrying Value		Fair Value
Assets:
Fixed maturity securities	$	12,444,394	$	12,462,847	$	12,705,160	$	12,725,806
Equity securities available for sale	150,866		150,866		170,991		170,991
Arbitrage trading account	376,697		376,697		450,648		450,648
Loans receivable	273,103		275,747		322,012		325,219
Cash and cash equivalents	763,631		763,631		674,441		674,441
Trading accounts receivable from brokers and clearing organizations	383,115		383,115		371,034		371,034
Due from broker	1,713		1,713		—		—
Liabilities:
Due to broker	—		—		23,133		23,133
Trading account securities sold but not yet purchased	37,035		37,035		106,079		106,079
Subordinated debentures	340,320		355,880		340,060		332,640
Senior notes and other debt	1,844,621		2,029,572		2,115,527		2,344,292

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 13 above. The fair value of loans receivable are 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.

(21) 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: $42,470,000 in 2016; $39,443,000 in 2017; $35,286,000 in 2018; $30,941,000 in 2019; $28,584,000 in 2020 and $105,825,000 thereafter. Rental expense was $46,271,000, $45,198,000 and $44,752,000 for 2015, 2014 and 2013, respectively.

(22) 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, 2015, the Company had commitments to invest up to $117 million and $485 million in certain investment funds and real estate construction projects, respectively.

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(23) Stock Incentive Plan

The Company has not issued any stock options under its stock incentive plans since 2004, and there were no outstanding options at December 31, 2015 and December 31, 2014.

Pursuant to the 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, 2015:

	2015		2014		2013
RSUs granted and unvested at beginning of period:	5,330,445		4,491,520		4,701,120
Granted	997,522		1,154,950		108,400
Vested	(1,938,000	)	(81,500	)	(146,250	)
Canceled	(231,642	)	(234,525	)	(171,750	)
RSUs granted and unvested at end of period:	4,158,325		5,330,445		4,491,520

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, 2015, 4,275,474 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, 2015:

(In thousands)	2015			2014			2013
Unearned compensation at beginning of year	$	88,015		$	73,205		$	93,653
RSUs granted, net of cancellations	50,442			51,575			4,406
RSUs expensed	(30,691		)	(27,966		)	(22,881		)
RSUs forfeitures	(4,228		)	(8,799		)	(1,973		)
Unearned compensation at end of year	$	103,538		$	88,015		$	73,205

(24) 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 will 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, $38 million, and $34 million in 2015, 2014 and 2013, respectively.

The Company has a long-term incentive compensation plan ("LTIP") that provides for incentive 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, 2015:

	Units Outstanding	Maximum Value		Inception to date earned through December 31, 2015 on outstanding units
2011 grant	172,850	$	43,212,500	$	34,331,000
2013 grant	204,500	51,125,000		23,804,000
2014 grant	216,750	21,675,000		6,559,000
2015 grant	213,250	21,325,000		3,205,000

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The following table summarizes the LTIP expense for each of the three years ended December 31, 2015:

(In thousands)	2015		2014		2013
2011 grant	$	7,397	$	9,855	$	6,939
2013 grant	7,336		9,493		7,231
2014 grant	2,935		3,663		—
2015 grant	3,205		—		—
Total	$	20,873	$	23,011	$	14,170

(25) Retirement Benefits

The Company and its executive chairman of the board entered into an unfunded supplemental benefit agreement (SBA) in 2004. On March 28, 2013, the Company agreed to terminate and distribute the retirement benefit of the SBA. As a result, the Company distributed retirement benefits of $0.3 million and $4.6 million in 2013 and 2014, respectively. The final retirement benefit of $59.4 million, which was fully accrued at December 31, 2014, was distributed in 2015. Net retirement benefit expense was $13,357,000, $9,994,000 and none in 2013, 2014, and 2015 respectively.

(26) Supplemental Financial Statement Data

Other operating costs and expenses consist of the following:

(In thousands)	2015		2014			2013
Amortization of deferred policy acquisition costs	$	1,102,492	$	1,053,397		$	991,070
Other underwriting expenses	903,006		843,133			780,058
Service company expenses	127,365		102,726			88,662
Net foreign currency losses (gains)	400		(27		)	(10,120		)
Other costs and expenses	156,487		158,227			151,014
Total	$	2,289,750	$	2,157,456		$	2,000,684

(27) Industry Segments

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

• Insurance-Domestic - commercial insurance business, including excess and surplus lines and admitted lines, primarily throughout the United States;

• Insurance-International - insurance business primarily in the United Kingdom, Continental Europe, South America, Canada, Scandinavia, Asia, and Australia;

• Reinsurance-Global - 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 (loss) 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.

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Revenues
(In thousands)	Earned Premiums		Investment Income		Other		Total		Pre-Tax Income (Loss)			Net Income (Loss)
December 31, 2015:
Insurance-Domestic	$	4,659,359	$	358,935	$	96,487	$	5,114,781	$	724,667		$	495,082
Insurance-International	772,141		51,522		—		823,663		51,926			37,204
Reinsurance-Global	609,109		74,226		—		683,335		94,852			66,627
Corporate, other and eliminations(1)	—		27,962		464,392		492,354		(231,739		)	(155,230		)
Net investment gains	—		—		92,324		92,324		92,324			60,011
Consolidated	$	6,040,609	$	512,645	$	653,203	$	7,206,457	$	732,030		$	503,694
December 31, 2014:
Insurance-Domestic	$	4,271,933	$	428,632	$	106,853	$	4,807,418	$	796,309		$	539,461
Insurance-International	802,375		55,407		—		857,782		29,779			22,182
Reinsurance-Global	670,110		88,821		—		758,931		115,677			79,720
Corporate, other and eliminations(1)	—		28,025		421,920		449,945		(244,421		)	(158,133		)
Net investment gains	—		—		254,852		254,852		254,852			165,654
Consolidated	$	5,744,418	$	600,885	$	783,625	$	7,128,928	$	952,196		$	648,884
December 31, 2013:
Insurance-Domestic	$	3,782,416	$	404,280	$	107,517	$	4,294,213	$	648,740		$	449,981
Insurance-International	723,151		47,039		—		770,190		56,922			40,292
Reinsurance-Global	720,970		89,090		—		810,060		110,425			78,013
Corporate, other and eliminations(1)	—		3,882		408,645		412,527		(238,743		)	(142,479		)
Net investment gains	—		—		121,544		121,544		121,544			74,118
Consolidated	$	5,226,537	$	544,291	$	637,706	$	6,408,534	$	698,888		$	499,925

Identifiable Assets
(In thousands)	December 31, 2015		December 31, 2014
Insurance-Domestic	$	16,351,737	$	16,065,409
Insurance-International	1,711,993		1,879,438
Reinsurance-Global	2,441,340		2,713,554
Corporate, other and eliminations(1)	1,225,897		1,058,290
Consolidated	$	21,730,967	$	21,716,691

_______________________________________

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

88

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

(In thousands)	2015		2014		2013
Insurance-Domestic
Other liability	$	1,546,157	$	1,449,425	$	1,259,376
Workers' compensation	1,269,785		1,126,704		995,047
Short-tail lines	925,468		875,898		774,809
Commercial automobile	548,450		526,344		486,759
Professional liability	369,499		293,562		266,425
Total Insurance-Domestic	4,659,359		4,271,933		3,782,416
Insurance-International
Other liability	103,974		92,411		65,528
Workers' compensation	93,728		71,997		84,637
Short-tail lines	373,415		415,123		336,814
Commercial automobile	125,628		116,369		130,020
Professional liability	75,396		106,475		106,152
Total Insurance-International	772,141		802,375		723,151
Reinsurance-Global
Casualty	421,811		487,264		507,790
Property	187,298		182,846		213,180
Total Reinsurance-Global	609,109		670,110		720,970
Total	$	6,040,609	$	5,744,418	$	5,226,537

(28) Quarterly Financial Information (Unaudited)

The following is a summary of quarterly financial data:

(In thousands. except per share data)	2015
Three months ended	March 31		June 30		September 30		December 31
Revenues	$	1,744,679	$	1,789,765	$	1,860,957	$	1,811,056
Net income	118,307		123,035		152,607		109,745
Net income per share(1)
Basic	0.94		0.99		1.24		0.89
Diluted	0.89		0.95		1.18		0.85

	2014
Three months ended	March 31		June 30		September 30		December 31
Revenues	$	1,706,906	$	1,796,989	$	1,840,605	$	1,784,428
Net income	169,673		179,961		188,539		110,711
Net income per share(1)
Basic	1.31		1.41		1.48		0.87
Diluted	1.25		1.35		1.42		0.83

_______________________________________

(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.

89

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, 2015, there have been no changes in our internal control over financial reporting that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

90

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, 2015.

91

Report of Independent Registered Public Accounting Firm

The Board of Directors and Stockholders

W. R. Berkley Corporation:

We have audited W. R. Berkley Corporation's internal control over financial reporting as of December 31, 2015 based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). W. R. Berkley Corporation's management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management's Report on Internal Control over Financial Reporting. Our responsibility is to express an opinion on the Company's internal control over financial reporting based on our audit.

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

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

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

In our opinion, W. R. Berkley Corporation maintained, in all material respects, effective internal control over financial reporting as of December 31, 2015, 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), the consolidated balance sheets of W. R. Berkley Corporation as of December 31, 2015 and 2014, and 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, 2015, and our report dated February 22, 2016 expressed an unqualified opinion on those consolidated financial statements.

/S/ KPMG LLP

New York, New York

February 22, 2016

92

ITEM 9B. OTHER INFORMATION

None.

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, 2015, 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, 2015, 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, 2015, 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, 2015, 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, 2015, 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, 2015, 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, 2015, and which is incorporated herein by reference.

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.

93

Index to Financial Statement Schedules	Page
Independent Registered Public Accountants’ Report on Schedules	100
Schedule II — Condensed Financial Information of Registrant	101
Schedule III — Supplementary Insurance Information	105
Schedule IV — Reinsurance	106
Schedule V — Valuation and Qualifying Accounts	107
Schedule VI — Supplementary Information Concerning Property — Casualty Insurance Operations	108

(b) Exhibits

The exhibits filed as part of this report are listed on pages 96 - 99 hereof.

94

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, 2016

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, 2016
William R. Berkley	of the Board of Directors
/s/  W. Robert Berkley, Jr.	President, Chief Executive Officer
W. Robert Berkley, Jr.	and Director	February 22, 2016
	(Principal executive officer)
/s/  Christopher L. Augostini	Director
Christopher L. Augostini		February 22, 2016
/s/  Ronald E. Blaylock	Director
Ronald E. Blaylock		February 22, 2016
/s/  Mark E. Brockbank	Director
Mark E. Brockbank		February 22, 2016
/s/  George G. Daly	Director
George G. Daly		February 22, 2016
/s/  Mary C. Farrell	Director
Mary C. Farrell		February 22, 2016
/s/  Jack H. Nusbaum	Director
Jack H. Nusbaum		February 22, 2016
/s/  Mark L. Shapiro	Director
Mark L. Shapiro		February 22, 2016
/s/  Eugene G. Ballard	Executive Vice President and
Eugene G. Ballard	Chief Financial Officer	February 22, 2016
	(Principal financial officer and principal accounting officer)

95

ITEM 15. (b) 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).

96

(4.90)	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).
(4.10)	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 2003 Stock Incentive Plan (incorporated by reference to Annex A of the Company’s 2003 Proxy Statement (File No. 1-15202) filed with the Commission on April 14, 2003).
(10.2)	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).
(10.3)	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)	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).
(10.9)	W. R. Berkley Corporation Deferred Compensation Plan for Officers as amended and restated effective December 3, 2007 (incorporated by reference to Exhibit 10.4 of the Company’s Current Report on Form 8-K (File No. 1-15202) filed with the Commission on December 19, 2007).
(10.10)	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).
(10.11)	W. R. Berkley Corporation 2007 Annual Incentive Compensation Plan (incorporated by reference to Annex A of the Company’s 2006 Proxy Statement (File No. 1-15202) filed with the Commission on April 18, 2006).
(10.12)	W. R. Berkley Corporation 2009 Long-Term Incentive Plan (incorporated by reference to Annex A of the Company’s 2009 Proxy Statement (File No. 1-15202) filed with the Commission on April 17, 2009).
(10.13)	Form of 2011 Performance Unit Award Agreement under the W. R. Berkley Corporation 2009 Long-Term Incentive Plan (incorporated by reference to Exhibit 10.12 of the Company's Annual Report on Form 10-K (File No. 1-15202) filed with the Commission on February 28, 2012).

97

(10.14)	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).
(10.15)	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).
(10.16)	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)	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).
(10.18)	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).
(10.19)	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).
(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) Following is a list of the Company’s significant subsidiaries and other operating entities. Subsidiaries of subsidiaries are indented and the parent of each such corporation owns 100% of the outstanding voting securities of such corporation except as noted below.

98

	Jurisdiction of Incorporation	Percentage owned by the Company (1)
Berkley International, LLC (2)	New York	100	%
Queen's Island Insurance Company, Ltd.	Bermuda	100	%
Signet Star Holdings, Inc.	Delaware	100	%
Berkley Insurance Company	Delaware	100	%
Admiral Insurance Company	Delaware	100	%
Admiral Indemnity Company	Delaware	100	%
Carolina Casualty Insurance Company	Iowa	100	%
Clermont Insurance Company	Iowa	100	%
Nautilus Insurance Company	Arizona	100	%
Berkley Assurance Company	Iowa	100	%
Berkley Life and Health Insurance Company	Iowa	100	%
Berkley London Holdings, Inc.	Delaware	100	%
W. R. Berkley London Holdings, Limited	United Kingdom	100	%
W. R. Berkley Insurance (Europe), Limited	United Kingdom	100	%
W. R. Berkley Europe AG	Liechtenstein	100	%
Berkley National Insurance Company	Iowa	100	%
Berkley Regional Insurance Company	Delaware	100	%
Acadia Insurance Company	New Hampshire	100	%
American Mining Insurance Company	Iowa	100	%
Berkley Regional Specialty Insurance Company	Delaware	100	%
Continental Western Insurance Company	Iowa	100	%
Firemen’s Insurance Company of Washington, D.C.	Delaware	100	%
Tri-State Insurance Company of Minnesota	Iowa	100	%
Union Insurance Company	Iowa	100	%
Gemini Insurance Company	Delaware	100	%
Great Divide Insurance Company	North Dakota	100	%
Key Risk Insurance Company	North Carolina	100	%
Midwest Employers Casualty Company	Delaware	100	%
Preferred Employers Casualty Company	California	100	%
Riverport Insurance Company	Iowa	100	%
StarNet Insurance Company	Delaware	100	%

_______________________________________

(1) W. R. Berkley Corporation is the ultimate parent. The subsidiary of a direct parent is indicated by an indentation, and its percentage ownership is as indicated in this column.

(2) Berkley International, LLC is held by W. R. Berkley Corporation and its subsidiaries as follows: W. R. Berkley Corporation (2%), Berkley Regional Insurance Company (14%) and Berkley Insurance Company (84%).

(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).
(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.

99

Report of Independent Registered Public Accounting Firm

The Board of Directors and Stockholders

W. R. Berkley Corporation:

Under date of February 22, 2016, we reported on the consolidated balance sheets of W. R. Berkley Corporation and subsidiaries as of December 31, 2015 and 2014, and 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, 2015, which are included in the Annual Report on Form 10-K for the year ended December 31, 2015. In connection with our audits of the aforementioned consolidated financial statements, we also audited the related consolidated financial statement schedules II through VI. These financial statement schedules are the responsibility of the Company's management. Our responsibility is to express an opinion on these financial statement schedules based on our audits.

In our opinion, such financial statement schedules, when considered in relation to the basic consolidated financial statements taken as a whole, present fairly, in all material respects, the information set forth therein.

/S/ KPMG LLP

New York, New York

February 22, 2016

100

Schedule II

W. R. Berkley Corporation

Condensed Financial Information of Registrant

Balance Sheets (Parent Company)

	December 31,
(In thousands)	2015			2014
Assets:
Cash and cash equivalents	$	195,658		$	90,693
Fixed maturity securities available for sale at fair value (cost $201,256 and $272,283 at December 31, 2015 and 2014, respectively)	201,738			273,773
Equity securities available for sale, at fair value (cost $3,430 in 2015 and $3,738 in 2014)	3,430			3,738
Investment in subsidiaries	6,454,065			6,693,731
Deferred Federal income taxes	37,135			—
Current Federal income taxes	51,512			62,882
Property, furniture and equipment at cost, less accumulated depreciation	13,150			9,852
Other assets	6,153			6,978
Total assets	$	6,962,841		$	7,141,647
Liabilities and stockholders’ equity
Liabilities:
Due to subsidiaries	$	143,669		$	87,540
Other liabilities	115,737			162,648
Deferred Federal income taxes	—			149
Subordinated debentures	340,320			340,060
Senior notes	1,762,869			1,961,305
Total liabilities	2,362,595			2,551,702
Stockholders’ equity:
Preferred stock	—			—
Common stock	47,024			47,024
Additional paid-in capital	1,005,455			991,512
Retained earnings (including accumulated undistributed net income of subsidiaries of $4,746,934 and $4,700,821 at December 31, 2015 and 2014, respectively)	6,178,070			5,732,410
Accumulated other comprehensive income (loss)	(66,698		)	183,550
Treasury stock, at cost	(2,563,605		)	(2,364,551		)
Total stockholders’ equity	4,600,246			4,589,945
Total liabilities and stockholders’ equity	$	6,962,841		$	7,141,647

________________

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

101

Schedule II, Continued

W. R. Berkley Corporation

Condensed Financial Information of Registrant, Continued

Statements of Income (Parent Company)

	Years Ended December 31,
(In thousands)	2015			2014			2013
Management fees and investment income including dividends from subsidiaries of $642,421, $503,483, and $269,626 for the years ended December 31, 2015, 2014 and 2013, respectively	$	655,318		$	515,775		$	277,223
Net investment gains	696			5,487			24,550
Other income	348			450			223
Total revenues	656,362			521,712			301,996
Operating costs and expense	143,391			148,288			122,562
Interest expense	128,248			125,352			120,066
Income before federal income taxes	384,723			248,072			59,368
Federal income taxes:
Federal income taxes provided by subsidiaries on a separate return basis	272,180			366,721			225,845
Federal income tax expense on a consolidated return basis	(199,322		)	(273,310		)	(154,928		)
Net expense	72,858			93,411			70,917
Income before undistributed equity in net income of subsidiaries	457,581			341,483			130,285
Equity in undistributed net income of subsidiaries	46,113			307,401			369,640
Net income	$	503,694		$	648,884		$	499,925

________________

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

102

Schedule II, Continued

W. R. Berkley Corporation

Condensed Financial Information of Registrant, Continued

Statements of Cash Flows (Parent Company)

	Years Ended December 31,
(In thousands)	2015			2014			2013
Cash flows from (used in) from operating activities:
Net income	$	503,694		$	648,884		$	499,925
Adjustments to reconcile net income to net cash from operating activities:
Net investment gains	(696		)	(5,487		)	(24,550		)
Depreciation and amortization	2,693			2,916			10,397
Equity in undistributed earnings of subsidiaries	(46,113		)	(307,401		)	(369,640		)
Tax payments received from subsidiaries	311,482			462,809			77,305
Federal income taxes provided by subsidiaries on a separate return basis	(272,180		)	(366,721		)	(225,845		)
Stock incentive plans	29,725			28,068			23,784
Change in:
Federal income taxes	51,772			(15,239		)	21,866
Other assets	301			(364		)	(821		)
Other liabilities	(92,752		)	(39,780		)	(15,470		)
Accrued investment income	524			(820		)	967
Net cash from (used in) operating activities	488,450			406,865			(2,082		)
Cash from (used in) investing activities:
Proceeds from sales of fixed maturity securities	380,986			289,683			230,854
Proceeds from maturities and prepayments of fixed maturity securities	123,639			103,646			68,918
Proceeds from sales of equity securities	308			7,356			23,395
Cost of purchases of fixed maturity securities	(432,645		)	(605,768		)	(79,132		)
Cost of purchases of equity securities	—			—			(4,668		)
Cost of acquired companies	—			(82,879		)	—
Investments in and advances to subsidiaries, net	30,338			34,191			(58,454		)
Change in balance due to security broker	—			(2,151		)	6,918
Net additions to real estate, furniture & equipment	(4,425		)	(1,615		)	(1,896		)
Net cash from (used in) investing activities	98,201			(257,537		)	185,935
Cash from (used in) financing activities:
Net proceeds from issuance of senior notes	—			344,472			339,627
Net proceeds from stock options exercised	—			—			53
Repayment of senior notes	(200,000		)	—			(450,000		)
Purchase of common treasury shares	(223,652		)	(238,933		)	(166,473		)
Cash dividends to common stockholders	(58,034		)	(181,489		)	(52,717		)
Net cash from (used in) financing activities	(481,686		)	(75,950		)	(329,510		)
Net increase (decrease) in cash and cash equivalents	104,965			73,378			(145,657		)
Cash and cash equivalents at beginning of year	90,693			17,315			162,972
Cash and cash equivalents at end of year	$	195,658		$	90,693		$	17,315

________________

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

103

W. R. Berkley Corporation

Condensed Financial Information of Registrant,Continued

December 31, 2015

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 2014 and 2013 financial statements as originally reported to conform them to the presentation of the 2015 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.

104

Schedule III

W. R. Berkley Corporation and Subsidiaries

Supplementary Insurance Information

December 31, 2015, 2014 and 2013

(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 Cost and Expenses		Net Premiums Written
December 31, 2015
Insurance-Domestic	$	367,977	$	8,450,190	$	2,529,931	$	4,659,359	$	358,935	$	2,851,136	$	760,020	$	778,957	$	4,812,830
Insurance-International	62,687		798,116		324,530		772,141		51,522		449,147		169,962		152,629		778,567
Reinsurance-Global	82,464		1,420,844		282,672		609,109		74,226		355,987		172,510		59,986		598,118
Corporate and adjustments	—		—		—		—		27,962		—		—		195,686		—
Total	$	513,128	$	10,669,150	$	3,137,133	$	6,040,609	$	512,645	$	3,656,270	$	1,102,492	$	1,187,258	$	6,189,515
December 31, 2014
Insurance-Domestic	$	347,261	$	8,000,863	$	2,384,511	$	4,271,933	$	428,632	$	2,571,010	$	710,141	$	729,958	$	4,517,587
Insurance-International	60,900		855,852		342,746		802,375		55,407		503,997		173,877		150,129		828,076
Reinsurance-Global	80,364		1,512,986		299,475		670,110		88,821		415,560		169,379		58,315		651,284
Corporate and adjustments	—		—		—		—		28,025		—		—		165,657		—
Total	$	488,525	$	10,369,701	$	3,026,732	$	5,744,418	$	600,885	$	3,490,567	$	1,053,397	$	1,104,059	$	5,996,947
December 31, 2013
Insurance-Domestic	$	306,464	$	7,715,124	$	2,107,768	$	3,782,416	$	404,280	$	2,318,541	$	651,524	$	671,096	$	3,994,387
Insurance-International	60,751		672,009		317,691		723,151		47,039		429,900		152,843		124,497		756,185
Reinsurance-Global	84,886		1,693,808		355,978		720,970		89,090		448,583		186,703		64,567		749,601
Corporate and adjustments	—		—		—		—		3,882		—		—		149,454		—
Total	$	452,101	$	10,080,941	$	2,781,437	$	5,226,537	$	544,291	$	3,197,024	$	991,070	$	1,009,614	$	5,500,173

See accompanying Report of Independent Registered Public Accounting Firm.

105

Schedule IV

W. R. Berkley Corporation and Subsidiaries

Reinsurance

Years ended December 31, 2015, 2014 and 2013

	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, 2015:
Insurance-Domestic	$	5,521,447	$	871,358	$	162,741	$	4,812,830	3.4	%
Insurance-International	874,359		144,737		48,945		778,567		6.3	%
Reinsurance-Global	16,727		44,383		625,774		598,118		104.6	%
Total	$	6,412,533	$	1,060,478	$	837,460	$	6,189,515	13.5	%
Year ended December 31, 2014:
Insurance-Domestic	$	5,214,849	$	866,092	$	168,830	$	4,517,587	3.7	%
Insurance-International	927,799		156,195		56,472		828,076		6.8	%
Reinsurance-Global	42,594		43,604		652,294		651,284		100.2	%
Total	$	6,185,242	$	1,065,891	$	877,596	$	5,996,947	14.6	%
Year ended December 31, 2013:
Insurance-Domestic	$	4,699,348	$	809,368	$	104,407	$	3,994,387	2.6	%
Insurance-International	887,027		142,591		11,749		756,185		1.6	%
Reinsurance-Global	39,797		58,959		768,763		749,601		102.6	%
Total	$	5,626,172	$	1,010,918	$	884,919	$	5,500,173	16.1	%

See accompanying Report of Independent Registered Public Accounting Firm.

106

Schedule V

W. R. Berkley Corporation and Subsidiaries

Valuation and Qualifying Accounts

Years ended December 31, 2015, 2014 and 2013

(In thousands)	Opening Balance		Additions- Charged to Expense			Deduction- Amounts Written Off			Ending Balance
Year ended December 31, 2015:
Premiums and fees receivable	$	21,446	$	6,281		$	(5,203	)	$	22,524
Due from reinsurers	1,144		(24		)	(100		)	1,020
Deferred federal and foreign income taxes	1,335		2,702			—			4,037
Loan loss reserves	2,486		(392		)	—			2,094
Total	$	26,411	$	8,567		$	(5,303	)	$	29,675
Year ended December 31, 2014:
Premiums and fees receivable	$	20,951	$	5,944		$	(5,449	)	$	21,446
Due from reinsurers	1,385		301			(542		)	1,144
Deferred federal and foreign income taxes	—		1,335			—			1,335
Loan loss reserves	2,087		399			—			2,486
Total	$	24,423	$	7,979		$	(5,991	)	$	26,411
Year ended December 31, 2013:
Premiums and fees receivable	$	22,919	$	3,133		$	(5,101	)	$	20,951
Due from reinsurers	1,680		186			(481		)	1,385
Loan loss reserves	5,620		308			(3,841		)	2,087
Total	$	30,219	$	3,627		$	(9,423	)	$	24,423

See accompanying Report of Independent Registered Public Accounting Firm.

107

Schedule VI

W. R. Berkley Corporation and Subsidiaries

Supplementary Information Concerning Property-Casualty Insurance Operations

Years Ended December 31, 2015, 2014 and 2013

(In thousands)	2015			2014			2013
Deferred policy acquisition costs	$	513,128		$	488,525		$	452,101
Reserves for losses and loss expenses	10,669,150			10,369,701			10,080,941
Unearned premium	3,137,133			3,026,732			2,781,437
Net premiums earned	6,040,609			5,744,418			5,226,537
Net investment income	512,645			600,885			544,291
Losses and loss expenses incurred:
Current year	3,653,561			3,495,825			3,221,393
Prior years	(46,713		)	(75,764		)	(78,810		)
Loss reserve discount accretion	49,422			70,506			54,441
Amortization of deferred policy acquisition costs	1,102,492			1,053,397			991,070
Paid losses and loss expenses	3,257,015			3,115,227			2,878,071
Net premiums written	6,189,515			5,996,947			5,500,173

See accompanying Report of Independent Registered Public Accounting Firm.

108

EX-23

Consent of Independent Registered Public Accounting Firm

The Board of Directors

W. R. Berkley Corporation:

We consent to the incorporation by reference in the registration statements on Form S-3 (No. 333-200392) and on Forms S-8 (No. 333-33935, No. 33-55726, No. 33-88640, No. 333-127598, No. 333-183191 and No. 333-205226) of W. R. Berkley Corporation of our reports dated February 22, 2016 with respect to the consolidated balance sheets of W. R. Berkley Corporation as of December 31, 2015 and 2014, and 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, 2015, and all related financial statement schedules and the effectiveness of internal control over financial reporting as of December 31, 2015, which reports appear in the annual report on Form 10-K of W. R. Berkley Corporation for the year ended December 31, 2015.

/S/ KPMG LLP

New York, New York

February 22, 2016

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, 2016

/s/ W. Robert Berkley, Jr. 

W. Robert Berkley, Jr.

President and Chief Executive Officer 

EX-31.2

Exhibit 31.2

CERTIFICATIONS

I, Eugene G. Ballard, Executive Vice President - Chief Financial 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, 2016

/s/ Eugene G. Ballard

Eugene G. Ballard

Executive Vice President -

Chief Financial Officer

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, 2015 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 Eugene G. Ballard, Executive Vice President-Chief Financial Officer 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/ Eugene G. Ballard

Eugene G. Ballard

Executive Vice President — Chief Financial Officer

February 22, 2016

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, 2015	Feb. 17, 2016	Jun. 30, 2015
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, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		122,586,752
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 5,048,029,512

XML

Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
REVENUES:
Net premiums written	$ 6,189,515	$ 5,996,947	$ 5,500,173
Change in net unearned premiums	(148,906)	(252,529)	(273,636)
Net premiums earned	6,040,609	5,744,418	5,226,537
Net investment income	512,645	600,885	544,291
Insurance service fees	139,440	117,443	107,513
Net investment gains:
Net realized gains on investment sales	125,633	254,852	127,586
Other-than-temporary impairments	(33,309)	0	(6,042)
Net investment gains	92,324	254,852	121,544
Revenues from wholly-owned investees	421,102	410,022	407,623
Other income	337	1,308	1,026
Total revenues	7,206,457	7,128,928	6,408,534
OPERATING COSTS AND EXPENSES:
Losses and loss expenses	3,656,270	3,490,567	3,197,024
Other operating costs and expenses	2,289,750	2,157,456	2,000,684
Expenses from wholly-owned investees	397,461	400,535	388,761
Interest expense	130,946	128,174	123,177
Total operating costs and expenses	6,474,427	6,176,732	5,709,646
Income before income taxes	732,030	952,196	698,888
Income Tax expense	(227,923)	(302,593)	(193,587)
Net income before noncontrolling interests	504,107	649,603	505,301
Noncontrolling interests	(413)	(719)	(5,376)
Net income to common stockholders	$ 503,694	$ 648,884	$ 499,925
NET INCOME PER SHARE:
Basic (dollars per share)	$ 4.06	$ 5.07	$ 3.69
Diluted (dollars per share)	$ 3.87	$ 4.86	$ 3.55

XML

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Investments:
Fixed maturity securities	$ 12,444,394	$ 12,705,160
Equity securities available for sale	150,866	170,991
Arbitrage trading account	376,697	450,648
Loans receivable	273,103	322,012
Investment funds	1,170,040	1,211,401
Equity securities available for sale	936,367	731,612
Total investments	15,351,467	15,591,824
Cash and cash equivalents	763,631	674,441
Premiums and fees receivable	1,669,186	1,651,088
Due from reinsurers	1,532,829	1,503,441
Accrued investment income	123,164	120,367
Prepaid reinsurance premiums	394,387	395,748
Deferred policy acquisition costs	513,128	488,525
Property, furniture and equipment	348,224	332,098
Goodwill	153,291	150,944
Accrued investment income	383,115	371,034
Current federal and foreign income taxes	55,763	67,623
Other assets	442,782	369,558
Total assets	21,730,967	21,716,691
Liabilities:
Reserves for losses and loss expenses	10,669,150	10,369,701
Unearned premiums	3,137,133	3,026,732
Due to reinsurers	224,752	237,270
Trading account securities sold but not yet purchased	37,035	106,079
Deferred federal and foreign income taxes	6,811	37,452
Other liabilities	837,937	859,736
Subordinated debentures	340,320	340,060
Senior notes and other debt	1,844,621	2,115,527
Total liabilities	17,097,759	17,092,557
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, 132,233,167 and 136,017,732 shares, respectively	47,024	47,024
Additional paid-in capital	1,005,455	991,512
Retained earnings	6,178,070	5,732,410
Accumulated other comprehensive income (loss)	(66,698)	183,550
Treasury stock, at cost, 111,810,081 and 108,369,082 shares, respectively	(2,563,605)	(2,364,551)
Total common stockholders’ equity	4,600,246	4,589,945
Noncontrolling interests	32,962	34,189
Total equity	4,633,208	4,624,134
Total liabilities and equity	$ 21,730,967	$ 21,716,691

XML

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2015	Dec. 31, 2014
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)	123,307,837	126,748,836
Common stock, outstanding (shares)	123,307,837	126,748,836
Treasury stock, at cost (shares)	111,810,081	108,369,082

XML

Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common stocks	Additional Paid In Capital	Retained Earnings	Accumulated Other Comprehensive Income	Unrealized Investment gains (losses)	Currency translation adjustments	Net pension asset	Treasury Stock	Noncontrolling Interests
Beginning of period at Dec. 31, 2012		$ 47,024	$ 945,166	$ 4,817,807		$ 517,658	$ (36,676)	$ (15,351)	$ (1,969,411)	$ 29,249
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock options exercised and restricted units issued including tax benefit			(1,143)
Restricted stock units expensed			22,881
Stock issued			536						597
Net income (loss)	$ 505,301			499,925						5,376
Dividends				(52,717)
Unrealized gains (losses) on securities not other-than-temporarily impaired	(261,064)					(261,791)
Unrealized gains (losses) on other-than-temporarily impaired securities						699
Net change in period	(23,848)						(23,848)
Net change in period	8,700							8,700
Stock exercised/vested									2,452
Stock repurchased									(166,473)
Acquisition (sale) of noncontrolling interest										(1,294)
Other comprehensive income, net of tax	(276,212)									28
End of period at Dec. 31, 2013		47,024	967,440	5,265,015	$ 189,391	256,566	(60,524)	(6,651)	(2,132,835)	33,359
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock options exercised and restricted units issued including tax benefit			(4,485)
Restricted stock units expensed			27,966
Stock issued			591						594
Net income (loss)	649,603			648,884						719
Dividends				(181,489)
Unrealized gains (losses) on securities not other-than-temporarily impaired	49,666					49,071
Unrealized gains (losses) on other-than-temporarily impaired securities						562
Net change in period	(62,125)						(62,125)
Net change in period	6,651							6,651
Stock exercised/vested									6,623
Stock repurchased									(238,933)
Acquisition (sale) of noncontrolling interest										78
Other comprehensive income, net of tax	(5,808)				(5,808)		(62,125)	6,651		33
End of period at Dec. 31, 2014	4,624,134	47,024	991,512	5,732,410	183,550	306,199	(122,649)	0	(2,364,551)	34,189
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock options exercised and restricted units issued including tax benefit			(17,456)
Restricted stock units expensed			30,691
Stock issued			708						623
Net income (loss)	504,107			503,694						413
Dividends				(58,034)
Unrealized gains (losses) on securities not other-than-temporarily impaired	(125,542)					(113)
Unrealized gains (losses) on other-than-temporarily impaired securities						(125,391)
Net change in period	(124,744)						(124,744)
Net change in period	0							0
Stock exercised/vested									23,975
Stock repurchased									(223,652)
Acquisition (sale) of noncontrolling interest										(1,602)
Other comprehensive income, net of tax	(250,286)				(250,286)		(124,744)	0		(38)
End of period at Dec. 31, 2015	$ 4,633,208	$ 47,024	$ 1,005,455	$ 6,178,070	$ (66,698)	$ 180,695	$ (247,393)	$ 0	$ (2,563,605)	$ 32,962

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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income before noncontrolling interests	$ 504,107	$ 649,603	$ 505,301
Other comprehensive income:
Change in unrealized translation adjustments	(124,744)	(62,125)	(23,848)
Change in unrealized investment gains (losses), net of taxes	(125,542)	49,666	(261,064)
Change in unrecognized pension obligation, net of taxes	0	6,651	8,700
Other comprehensive loss	(250,286)	(5,808)	(276,212)
Comprehensive income	253,821	643,795	229,089
Comprehensive income to the noncontrolling interest	(375)	(752)	(5,404)
Comprehensive income to common shareholders	$ 253,446	$ 643,043	$ 223,685

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Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
CASH FROM OPERATING ACTIVITIES:
Net income to common stockholders	$ 503,694	$ 648,884	$ 499,925
Adjustments to reconcile net income to net cash from operating activities:
Net investment gains	(92,324)	(254,852)	(121,544)
Depreciation and amortization	85,139	88,836	103,090
Noncontrolling interests	413	719	5,376
Investment funds	(62,228)	(131,649)	(67,712)
Stock incentive plans	32,123	28,068	23,784
Change in:
Arbitrage trading account	(7,173)	(50,817)	(10,324)
Premiums and fees receivable	(60,942)	(104,174)	(138,027)
Reinsurance accounts	(31,930)	(33,445)	(171,263)
Deferred policy acquisition costs	(29,860)	(42,789)	(52,124)
Increase (Decrease) in Income Taxes	20,428	(40,935)	(45,613)
Current Income Tax Expense (Benefit)	176,832	271,306	139,164
Deferred income taxes	47,260	30,812	56,281
Reserves for losses and loss expenses	397,685	376,617	372,002
Unearned premiums	142,699	277,826	323,160
Other	(63,680)	(58,254)	42,787
Net cash from operating activities	881,304	734,847	819,798
CASH FLOWS USED IN INVESTING ACTIVITIES:
Proceeds from sale of fixed maturity securities	1,388,680	633,459	1,344,707
Proceeds from sale of equity securities	15,833	113,251	267,554
Distributions from (contributions to) investment funds	177,424	69,319	(236,580)
Proceeds from maturities and prepayments of fixed maturity securities	2,999,339	2,605,839	2,718,156
Purchase of fixed maturity securities	(4,455,223)	(4,292,165)	(4,198,135)
Purchase of equity securities	(29,526)	(31,207)	(156,557)
Real estate purchased	(222,659)	(213,159)	(107,352)
Proceeds from Sale of Buildings	0	343,723	0
Change in loans receivable	48,909	21,608	(30,974)
Net additions to property, furniture and equipment	(63,562)	(41,958)	(63,150)
Change in balances due from security brokers	(22,666)	32,617	(26,155)
Proceeds from Divestiture of Businesses, Net of Cash Divested	0	15,783
Payment for business purchased, net of cash acquired	(7,312)	(65,421)	(56,878)
Net cash used in investing activities	(170,763)	(808,311)	(545,364)
CASH FLOWS USED IN FINANCING ACTIVITIES:
Net proceeds from issuance of debt	9,056	354,012	346,822
Net proceeds from stock options exercised	0	0	53
Repayment of senior notes and other debt	(281,086)	(3,700)	(465,389)
Cash dividends to common stockholders	(58,034)	(181,489)	(52,717)
Purchase of common treasury shares	(223,652)	(238,933)	(166,473)
Other	(1,602)	337	7,442
Net cash used in financing activities	(555,318)	(69,773)	(330,262)
Net impact on cash due to change in foreign exchange rates	(66,033)	(22,060)	(10,104)
Net increase (decrease) in cash and cash equivalents	89,190	(165,297)	(65,932)
Cash and cash equivalents at beginning of year	674,441	839,738	905,670
Cash and cash equivalents at end of year	$ 763,631	$ 674,441	$ 839,738

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Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2015

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 2014 and 2013 financial statements to conform to the presentation of the 2015 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 increased net premiums written and premiums earned by $3 million, $9 million and $12 million in 2015, 2014 and 2013, respectively.

Revenues from wholly-owned investees are derived from aircraft services provided to the general, commercial and military aviation markets. These 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 parts, the delivery of aircraft, the delivery of fuel, and upon completion 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 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.

Equity and 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. For certain investment funds, the Company's share of the earnings or losses is 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 13 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. Since equity securities do not have a contractual cash flow or a maturity, the Company considers whether the price of an equity security is expected to recover within a reasonable period of time.

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.,thepresent 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. Diluted EPS is based upon the weighted average number of common 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. Stock options for which the exercise price exceeds the average market price over the period have an anti-dilutive effect on EPS and, accordingly, are excluded from the calculation.

(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 for each of their major lines of business. 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 14 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 $54 million and $68 million at December 31, 2015 and 2014, 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 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 $45 million, $44 million and $38 million for 2015, 2014 and 2013, 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, unrealized foreign currency translation adjustments and changes in unrecognized pension obligations.

(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, 2015 indicated that there were no impairment losses related to goodwill and other intangible assets. Intangible assets of $94 million and $96 million are included in other assets as of December 31, 2015 and 2014, respectively.

(O) Stock options

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 $130 million, $120 million and $125 million in 2015, 2014 and 2013, respectively. Income taxes paid were $165 million, $314 million and $186 million in 2015, 2014 and 2013, respectively. Other non-cash items include acquisitions, unrealized investment gains and losses and pension expense. (See Note 2, Note 11 and Note 25 of Notes to Consolidated Financial Statements.)

(Q) Recent accounting pronouncements

The accounting and reporting standards that became effective in 2015 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 May 2014, the Financial Accounting Standards  Board (FASB) issued Accounting Standards Update (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 will be 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, is effective for public business entities for annual and interim reporting periods beginning after December 15, 2017.  The adoption of this guidance is not expected to have a material effect on the Company’s financial condition or results of operations.

In February 2015, the FASB issued ASU 2015-02, Consolidation.  ASU 2015-02 makes targeted amendments to the current consolidation accounting guidance, in response to accounting complexity concerns. The guidance simplifies consolidation accounting by reducing the number of approaches to consolidation.  The updated guidance is effective for annual and interim reporting periods beginning after December 15, 2015. The adoption of this guidance is not expected to have a material effect on the Company’s financial condition or results of operations, but will result in additional disclosures.

In May 2015, the FASB issued ASU 2015-09, Disclosures about Short-Duration Contracts.   ASU 2015-09 requires companies that issue short duration insurance contracts to disclose additional information, including: (i) incurred and paid claims development tables; (ii) frequency and severity of claims; and (iii) information about material changes in judgments made in calculating the liability for unpaid claim adjustment expenses, including reasons for the change and the effects on the financial statements. ASU 2015-09 is effective for annual periods beginning after December 15, 2015, and interim periods within annual periods beginning after December 15, 2016. The amendments in ASU 2015-09 should be applied retrospectively by providing comparative disclosures for each period presented, except for those requirements that apply only to the current period. As the requirements of this literature are disclosure only, the adoption of this guidance will not impact our financial condition or results of operations.

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 to be 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).  The updated guidance is effective for public business entities for annual reporting periods beginning after December 15, 2017 and interim periods within those years.  The adoption of this guidance is not expected to have a material effect on the Company’s financial condition upon adoption, but will impact results of operations after adoption of this guidance as unrealized gains and losses on equity securities will no longer be reported directly in AOCI, but will instead be reported in net income.

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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Acquisitions

12 Months Ended

Dec. 31, 2015

Business Combinations [Abstract]

Acquisitions

Acquisitions / Dispositions

In 2015, the Company acquired an aviation systems company for $8 million.

In 2014, the Company acquired a specialty property and casualty insurance distribution company for $83 million. The fair values of the assets acquired and liabilities assumed have been estimated based on a valuation prepared by a third party. The estimated useful lives of the intangible assets acquired range from 7 years to 15 years, with approximately $10 million having an indefinite life.

In 2014, the Company sold an aviation-related business for $16 million. The business had a net carrying value of $15 million, comprised of $7 million of goodwill, $6 million of other assets, $4 million of furniture and equipment and $2 million of liabilities.

The following table summarizes the estimated fair value of net assets acquired and liabilities assumed for the business combination completed in 2014:    

(In thousands)	2014
Cash and cash equivalents	$	17,457
Real estate, furniture and equipment	669
Goodwill and other intangibles assets	79,646
Premium and service fee receivable	24,432
Other assets	2,590
Total assets acquired	124,794
Deferred federal income tax	(7,107		)
Debt	—
Other liabilities assumed	(34,809		)
Net assets acquired	$	82,878

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Consolidated Statement of Comprehensive Income (Loss)

12 Months Ended

Dec. 31, 2015

Equity [Abstract]

Consolidated Statement of Comprehensive Income (Loss)

Consolidated Statement of Comprehensive Income (Loss)

The following table presents the components of the changes in accumulated other comprehensive income (loss) (AOCI) as of and for the year ended December 31, 2015:

(In thousands)	Unrealized investment gains (losses)				Currency translation adjustments			Net pension asset		Accumulated other comprehensive income (loss)
Changes in AOCI
Beginning of period	$	306,199			$	(122,649	)	$	—	$	183,550
Other comprehensive income (loss) before reclassifications	(119,994		)		(124,744		)	—		(244,738		)
Amounts reclassified from AOCI	(5,548		)		—			—		(5,548		)
Other comprehensive income (loss)	(125,542		)		(124,744		)	—		(250,286		)
Unrealized investment gain related to non-controlling interest	38				—			—		38
Ending balance	$	180,695			$	(247,393	)	$	—	$	(66,698	)
Amounts reclassified from AOCI
Pre-tax	$	(8,535	)	(1)	$	—		$	—	$	(8,535	)
Tax effect	2,987			(2)	—			—		2,987
After-tax amounts reclassified	$	(5,548	)		$	—		$	—	$	(5,548	)
Other comprehensive income (loss)
Pre-tax	$	(192,186	)		$	(124,744	)	$	—	$	(316,930	)
Tax effect	66,644				—			—		66,644
Other comprehensive income (loss)	$	(125,542	)		$	(124,744	)	$	—	$	(250,286	)

The following table presents the components of the changes in accumulated other comprehensive income (loss) (AOCI) as of and for the year ended December 31, 2014:

(In thousands)	Unrealized investment gains (losses)				Currency translation adjustments			Net pension asset				Accumulated other comprehensive income (loss)
Changes in AOCI
Beginning of period	$	256,566			$	(60,524	)	$	(6,651	)		$	189,391
Other comprehensive income (loss) before reclassifications	98,294				(62,125		)	—				36,169
Amounts reclassified from AOCI	(48,628		)		—			6,651				(41,977		)
Other comprehensive income (loss)	49,666				(62,125		)	6,651				(5,808		)
Unrealized investment gain related to non-controlling interest	(33		)		—			—				(33		)
Ending balance	$	306,199			$	(122,649	)	$	—			$	183,550
Amounts reclassified from AOCI
Pre-tax	$	(74,812	)	(1)	$	—		$	10,232		(3)	$	(64,580	)
Tax effect	26,184			(2)	—			(3,581		)	(2)	22,603
After-tax amounts reclassified	$	(48,628	)		$	—		$	6,651			$	(41,977	)
Other comprehensive income (loss)
Pre-tax	$	72,889			$	(62,125	)	$	10,232			$	20,996
Tax effect	(23,223		)		—			(3,581		)		(26,804		)
Other comprehensive income (loss)	$	49,666			$	(62,125	)	$	6,651			$	(5,808	)

_______________

(1) Net investment gains in the consolidated statements of income.

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

(3) Other operating costs and expenses in the consolidated statements of income.

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Investments In Fixed Maturity Securities

12 Months Ended

Dec. 31, 2013

Debt Securities

Schedule of Marketable Securities [Line Items]

Investments In Fixed Maturity Securities

Investments in Fixed Maturity Securities

At December 31, 2015 and 2014, investments in fixed maturity securities were as follows:

(In thousands)	Amortized Cost		Gross Unrealized					Fair Value		Carrying Value
			Gains		Losses
December 31, 2015
Held to maturity:
State and municipal	$	77,129	$	16,246	$	—		$	93,375	$	77,129
Residential mortgage-backed	19,138		2,207		—			21,345		19,138
Corporate	—		—		—			—		—
Total held to maturity	96,267		18,453		—			114,720		96,267
Available for sale:
U.S. government and government agency	645,092		27,660		(2,333		)	670,419		670,419
State and municipal:
Special revenue	2,510,816		102,909		(3,737		)	2,609,988		2,609,988
State general obligation	583,456		28,068		(2,070		)	609,454		609,454
Pre-refunded	439,772		32,056		(31		)	471,797		471,797
Corporate backed	388,904		14,039		(402		)	402,541		402,541
Local general obligation	342,158		24,270		(29		)	366,399		366,399
Total state and municipal	4,265,106		201,342		(6,269		)	4,460,179		4,460,179
Mortgage-backed securities:
Residential (1)	1,126,382		18,935		(11,180		)	1,134,137		1,134,137
Commercial	64,975		875		(128		)	65,722		65,722
Total mortgage-backed securities	1,191,357		19,810		(11,308		)	1,199,859		1,199,859
Asset-backed securities	1,706,694		12,892		(14,414		)	1,705,172		1,705,172
Corporate:
Industrial	1,976,393		75,168		(30,027		)	2,021,534		2,021,534
Financial	1,153,096		31,744		(11,819		)	1,173,021		1,173,021
Utilities	192,857		8,321		(2,527		)	198,651		198,651
Other	81,607		245		(20		)	81,832		81,832
Total corporate	3,403,953		115,478		(44,393		)	3,475,038		3,475,038
Foreign	799,839		50,310		(12,689		)	837,460		837,460
Total available for sale	12,012,041		427,492		(91,406		)	12,348,127		12,348,127
Total investments in fixed maturity securities	$	12,108,308	$	445,945	$	(91,406	)	$	12,462,847	$	12,444,394

(In thousands)	Amortized Cost		Gross Unrealized					Fair Value		Carrying Value
			Gains		Losses
December 31, 2014
Held to maturity:
State and municipal	$	72,901	$	17,501	$	—		$	90,402	$	72,901
Residential mortgage-backed	23,278		2,854		—			26,132		23,278
Corporate	4,998		291		—			5,289		4,998
Total held to maturity	101,177		20,646		—			121,823		101,177
Available for sale:
U.S. government and government agency	773,192		33,353		(3,157		)	803,388		803,388
State and municipal:
Special revenue	2,264,210		111,841		(2,084		)	2,373,967		2,373,967
State general obligation	674,022		37,615		(787		)	710,850		710,850
Pre-refunded	504,778		35,619		(289		)	540,108		540,108
Corporate backed	413,234		18,976		(855		)	431,355		431,355
Local general obligation	281,622		25,099		(5		)	306,716		306,716
Total state and municipal	4,137,866		229,150		(4,020		)	4,362,996		4,362,996
Mortgage-backed securities:
Residential (1)	1,201,924		27,124		(9,449		)	1,219,599		1,219,599
Commercial	74,479		1,610		(52		)	76,037		76,037
Total mortgage-backed securities	1,276,403		28,734		(9,501		)	1,295,636		1,295,636
Asset-backed securities	2,019,032		18,868		(11,974		)	2,025,926		2,025,926
Corporate:
Industrial	1,606,724		117,206		(5,131		)	1,718,799		1,718,799
Financial	1,140,801		38,080		(7,673		)	1,171,208		1,171,208
Utilities	184,107		12,436		(1		)	196,542		196,542
Other	86,294		1,370		(2		)	87,662		87,662
Total corporate	3,017,926		169,092		(12,807		)	3,174,211		3,174,211
Foreign	897,668		62,223		(18,065		)	941,826		941,826
Total available for sale	12,122,087		541,420		(59,524		)	12,603,983		12,603,983
Total investments in fixed maturity securities	$	12,223,264	$	562,066	$	(59,524	)	$	12,725,806	$	12,705,160

(1) Gross unrealized losses for mortgage-backed securities include $1,269,491 and $1,095,671, as of December 31, 2015 and 2014, 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, 2015, 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	$	711,642	$	717,075
Due after one year through five years	4,056,450		4,185,436
Due after five years through ten years	3,653,308		3,795,614
Due after ten years	2,476,413		2,543,518
Mortgage-backed securities	1,210,495		1,221,204
Total	$	12,108,308	$	12,462,847

At December 31, 2015 and 2014, 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, 2015, investments with a carrying value of $1,201 million were on deposit in custodial or trust accounts, of which $963 million was on deposit with state insurance departments, $182 million was on deposit in support of the Company’s underwriting activities at Lloyd’s, $41 million was on deposit as security for reinsurance clients and $15 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 Available for Sale

12 Months Ended

Dec. 31, 2015

Equity securities available for sale

Schedule of Available-for-sale Securities [Line Items]

Investments in Equity Securities

Investments in Equity Securities Available for Sale

At December 31, 2015 and 2014, investments in equity securities available for sale were as follows:

(In thousands)	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Carrying Value
December 31, 2015
Common stocks	$	56,462	$	—	$	(19,189	)	$	37,273	$	37,273
Preferred stocks	108,730		8,216		(3,353		)	113,593		113,593
Total	$	165,192	$	8,216	$	(22,542	)	$	150,866	$	150,866
December 31, 2014
Common stocks	$	69,870	$	11,929	$	(5,453	)	$	76,346	$	76,346
Preferred stocks	90,425		8,385		(4,165		)	94,645		94,645
Total	$	160,295	$	20,314	$	(9,618	)	$	170,991	$	170,991

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Arbitrage Trading Account

12 Months Ended

Dec. 31, 2015

Trading Securities and Derivative Instruments [Abstract]

Arbitrage Trading Account

Arbitrage Trading Account

At December 31, 2015 and 2014, the fair value and carrying value of the arbitrage trading account were $377 million and $451 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, 2015, the fair value of long option contracts outstanding was $3 million (notional amount of $52 million) and the fair value of short option contracts outstanding was $1 million (notional amount of $62 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, 2015

Net Investment Income [Abstract]

Net Investment Income

Net Investment Income

Net investment income consists of the following:

(In thousands)	2015			2014			2013
Investment income earned on:
Fixed maturity securities, including cash and cash equivalents and loans receivable	$	428,325		$	439,489		$	442,287
Equity securities available for sale	4,624			6,726			11,380
Investment funds	62,228			131,649			67,712
Arbitrage trading account	16,891			22,438			20,431
Real estate	11,294			10,228			12,498
Gross investment income	523,362			610,530			554,308
Investment expense	(10,717		)	(9,645		)	(10,017		)
Net investment income	$	512,645		$	600,885		$	544,291

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Investment Funds

12 Months Ended

Dec. 31, 2015

Equity Method Investments and Joint Ventures [Abstract]

Investment Funds

Investment Funds

Investment funds consist of the following:

	Carrying Value as of December 31,				Income (Losses)
(In thousands)	2015		2014		2015			2014		2013
Real estate	$	580,830	$	466,703	$	58,032		$	26,233	$	9,315
Energy	93,719		152,056		(37,373		)	12,797		29,739
Hedged equity	70,580		282,335		(2,762		)	10,760		7,655
Other funds	424,911		310,307		44,331			81,859		21,003
Total	$	1,170,040	$	1,211,401	$	62,228		$	131,649	$	67,712

Other funds include private equity investments carried on the equity method of accounting, which includes a publicly traded common stock investment in HealthEquity, Inc. (HQY). Our ownership interest in HQY as of December 31, 2015 is approximately 21% with a fair value of $300.1 million and a carrying value of $45.4 million.

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Real Estate (Notes)

12 Months Ended

Dec. 31, 2015

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)	2015		2014
Properties in operation	$	226,055	$	196,980
Properties under development	710,312		534,632
Total	$	936,367	$	731,612

In 2015, properties in operation included a long-term ground lease in Washington, D.C. and office buildings in West Palm Beach and Palm Beach, Florida. Properties in operation are net of accumulated depreciation and amortization of $9,073,000 and $1,609,000 as of December 31, 2015 and 2014, respectively. Related depreciation expense was $7,425,000 and $4,808,000 for the years ended December 31, 2015 and 2014, respectively. Future minimum rental income expected on operating leases relating to properties in operation is $13,141,756 in 2016, $15,483,248 in 2017, $14,623,307 in 2018, $11,967,190 in 2019, $9,584,128 in 2020 and $352,328,662 thereafter.

Properties under development represent the following: an office building in London, a mixed-use project in Washington D.C. and an office complex in New York City.

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Loans Receivable

12 Months Ended

Dec. 31, 2015

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)	2015			2014
Amortized cost:
Real estate loans	$	200,499		$	243,407
Commercial loans	72,604			78,605
Total	$	273,103		$	322,012
Fair value:
Real estate loans	$	201,641		$	245,112
Commercial loans	74,106			80,107
Total	$	275,747		$	325,219
Valuation allowance:
Specific	$	—		$	115
General	2,094			2,371
Total	$	2,094		$	2,486
	For the Year Ended December 31,
	2015			2014
(Decrease) increase in valuation allowance	$	(392	)	$	398

Loans receivable in non-accrual status were $3.1 million and $14.2 million as of December 31, 2015 and 2014, respectively, primarily resulting from the sale of such loans.

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 Arizona, Maryland, New York and Tennessee. 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. These loans generally earn interest on a fixed basis and have varying maturities not exceeding 10 years.

The Company utilizes a risk rating system to assign a risk to each of its real estate loans. The loan rating system takes into consideration 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 Company’s position in the capital structure, and the overall leverage in the capital structure. Based on this rating system, none of the real estate loans were considered tobe impaired at December 31, 2015, 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, 2015

Realized and Unrealized Investment Gains (Losses) [Abstract]

Realized and Unrealized Investment Gains and Losses

Realized and Unrealized Investment Gains and Losses

Realized and unrealized investment gains and losses are as follows:

(In thousands)	2015			2014			2013
Realized investment gains and losses:
Fixed maturity securities:
Gains	$	23,755		$	39,113		$	48,860
Losses	(4,065		)	(4,420		)	(14,670		)
Equity securities available for sale	9,639			38,296			70,235
Investment funds	93,529			96,204			10,976
Real estate	—			85,659			—
Other gains	2,775			—			12,185
Net realized gains on investments sales	125,633			254,852			127,586
Net other-than-temporary impairments:
Other-than-temporary impairments	(33,309		)	—			(6,042		)
Net other-than-temporary impairments	(33,309		)	—			(6,042		)
Total net investment gains	92,324			254,852			121,544
Income tax expense	(32,313		)	(89,198		)	(47,426		)
After-tax realized investment gain and losses	$	60,011		$	165,654		$	74,118

Change in unrealized gains and losses of available for sales securities:
Fixed maturity securities	$	(144,445	)	$	155,765		$	(401,812	)
Previously impaired fixed maturity securities	(174		)	865			1,076
Equity securities available for sale	(27,809		)	(69,016		)	11,864
Investment funds	(19,758		)	(14,725		)	(10,250		)
Total change in unrealized gains	(192,186		)	72,889			(399,122		)
Income tax benefit (expense)	66,644			(23,223		)	138,058
Noncontrolling interests	38			(33		)	(28		)
After-tax change in unrealized investment gain and losses of available for sale securities	$	(125,504	)	$	49,633		$	(261,092	)

OTTI recognized in earnings were $33.3 million and $6 million for the years ended December 31, 2015 and December 31, 2013, respectively. There were no OTTI for the year ended December 31, 2014. For the year ended December 31, 2015, OTTI related to equity securities were $24.3 million and related to fixed maturity securities were $9 million. For the year ended December 31, 2013, OTTI related to equity securities.

Realized and Unrealized Investment Gains and Losses

Realized and unrealized investment gains and losses are as follows:

(In thousands)	2015			2014			2013
Realized investment gains and losses:
Fixed maturity securities:
Gains	$	23,755		$	39,113		$	48,860
Losses	(4,065		)	(4,420		)	(14,670		)
Equity securities available for sale	9,639			38,296			70,235
Investment funds	93,529			96,204			10,976
Real estate	—			85,659			—
Other gains	2,775			—			12,185
Net realized gains on investments sales	125,633			254,852			127,586
Net other-than-temporary impairments:
Other-than-temporary impairments	(33,309		)	—			(6,042		)
Net other-than-temporary impairments	(33,309		)	—			(6,042		)
Total net investment gains	92,324			254,852			121,544
Income tax expense	(32,313		)	(89,198		)	(47,426		)
After-tax realized investment gain and losses	$	60,011		$	165,654		$	74,118

Change in unrealized gains and losses of available for sales securities:
Fixed maturity securities	$	(144,445	)	$	155,765		$	(401,812	)
Previously impaired fixed maturity securities	(174		)	865			1,076
Equity securities available for sale	(27,809		)	(69,016		)	11,864
Investment funds	(19,758		)	(14,725		)	(10,250		)
Total change in unrealized gains	(192,186		)	72,889			(399,122		)
Income tax benefit (expense)	66,644			(23,223		)	138,058
Noncontrolling interests	38			(33		)	(28		)
After-tax change in unrealized investment gain and losses of available for sale securities	$	(125,504	)	$	49,633		$	(261,092	)

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Securities In An Unrealized Loss Position

12 Months Ended

Dec. 31, 2015

Investments, Debt and Equity Securities [Abstract]

Securities In An Unrealized Loss Position

Securities in an Unrealized Loss Position

The following table summarizes all securities in an unrealized loss position at December 31, 2015 and 2014 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, 2015
U.S. government and government agency	$	101,660	$	487	$	64,500	$	1,846	$	166,160	$	2,333
State and municipal	501,952		4,404		106,681		1,865		608,633		6,269
Mortgage-backed securities	381,986		3,639		184,807		7,669		566,793		11,308
Asset-backed securities	1,091,078		7,703		190,467		6,711		1,281,545		14,414
Corporate	1,232,940		35,406		76,797		8,987		1,309,737		44,393
Foreign government	169,190		8,822		19,528		3,867		188,718		12,689
Fixed maturity securities	3,478,806		60,461		642,780		30,945		4,121,586		91,406
Common stocks	18,641		18,005		7,829		1,184		26,470		19,189
Preferred stocks	—		—		22,320		3,353		22,320		3,353
Equity securities available for sale	18,641		18,005		30,149		4,537		48,790		22,542
Total	$	3,497,447	$	78,466	$	672,929	$	35,482	$	4,170,376	$	113,948
December 31, 2014
U.S. government and government agency	$	84,750	$	522	$	84,850	$	2,635	$	169,600	$	3,157
State and municipal	158,594		631		150,284		3,389		308,878		4,020
Mortgage-backed securities	75,739		332		312,922		9,169		388,661		9,501
Asset-backed securities	1,186,097		6,217		30,818		5,757		1,216,915		11,974
Corporate	400,141		2,480		183,810		10,327		583,951		12,807
Foreign government	76,471		3,907		85,025		14,158		161,496		18,065
Fixed maturity securities	1,981,792		14,089		847,709		45,435		2,829,501		59,524
Common stocks	15,929		5,453		—		—		15,929		5,453
Preferred stocks	27,126		1,139		22,648		3,026		49,774		4,165
Equity securities available for sale	43,055		6,592		22,648		3,026		65,703		9,618
Total	$	2,024,847	$	20,681	$	870,357	$	48,461	$	2,895,204	$	69,142

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, 2015 is presented in the table below:

(Dollars in thousands)	Number of Securities	Aggregate Fair Value		Gross Unrealized Loss
Mortgage-backed securities	8	$	23,370	$	1,790
Asset-backed securities	7	19,535		264
Corporate	12	128,716		6,717
Foreign government	1	13,956		3,766
Total	28	$	185,577	$	12,537

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, 2015, OTTI for fixed maturities recognized in earnings were $9.0 million, all of which was considered due to credit factors. There were no OTTI of fixed maturity securities for the year ended December 31, 2014.

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.

Preferred Stocks – At December 31, 2015, there was one preferred stock in an unrealized loss position, with an aggregate fair value of $22.3 million and a gross unrealized loss of $3.4 million. The preferred stock is rated investment grade. Management believes the unrealized loss is due primarily to market and sector related factors and does not consider it to be OTTI. For the year ended December 31, 2015, OTTI for preferred stocks were $13.4 million. There were no OTTI of preferred stocks for the year ended December 31, 2014.

Common Stocks – At December 31, 2015, there were two common stocks in an unrealized loss position, with an aggregate fair value of $26.5 million and a gross unrealized loss of $19.2 million. Based on management's view on the underlying securities, the Company does not consider the common stocks to be OTTI. For the year ended December 31, 2015, OTTI for common stocks were $10.9 million. There were no OTTI of common stocks for the year ended December 31, 2014.

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 $2 million and $3 million at December 31, 2015 and 2014, respectively.

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Fair Value Measurements

12 Months Ended

Dec. 31, 2015

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 on a recurring basis as of December 31, 2015 and 2014 by level:

(In thousands)	Total		Level 1		Level 2		Level 3
December 31, 2015
Assets:
Fixed maturity securities available for sale:
U.S. government and government agency	$	670,419	$	—	$	670,419	$	—
State and municipal	4,460,179		—		4,460,179		—
Mortgage-backed securities	1,199,859		—		1,199,859		—
Asset-backed securities	1,705,172		—		1,704,973		199
Corporate	3,475,038		—		3,474,884		154
Foreign government	837,460		—		837,460		—
Total fixed maturity securities available for sale	12,348,127		—		12,347,774		353
Equity securities available for sale:
Common stocks	37,273		29,444		—		7,829
Preferred stocks	113,593		—		109,969		3,624
Total equity securities available for sale	150,866		29,444		109,969		11,453
Arbitrage trading account	376,697		256,914		119,607		176
Total	$	12,875,690	$	286,358	$	12,577,350	$	11,982
Liabilities:
Trading account securities sold but not yet purchased	$	37,035	$	35,559	$	1,476	$	—
December 31, 2014
Assets:
Fixed maturity securities available for sale:
U.S. government and government agency	$	803,388	$	—	$	803,388	$	—
State and municipal	4,362,996		—		4,362,996		—
Mortgage-backed securities	1,295,636		—		1,295,636		—
Asset-backed securities	2,025,926		—		2,005,315		20,611
Corporate	3,174,211		—		3,174,057		154
Foreign government	941,826		—		941,826		—
Total fixed maturity securities available for sale	12,603,983		—		12,583,218		20,765
Equity securities available for sale:
Common stocks	76,346		65,605		—		10,741
Preferred stocks	94,645		—		90,932		3,713
Total equity securities available for sale	170,991		65,605		90,932		14,454
Arbitrage trading account	450,648		295,047		154,881		720
Total	$	13,225,622	$	360,652	$	12,829,031	$	35,939
Liabilities:
Trading account securities sold but not yet purchased	$	106,079	$	106,074	$	5	$	—

There were no significant transfers between Levels 1 and 2 for the years ended December 31, 2015 and 2014.

The following tables summarize changes in Level 3 assets and liabilities for the years ended December 31, 2015 and 2014:

	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, 2015
Assets:
Fixed maturity securities available for sale:
Asset-backed securities	$	20,611	$	19		$	191		$	—		$	—	$	—		$	(1,820	)	$	(18,802	)	$	199
Corporate	154		—			—			—			—		—			—			—			154
Total	20,765		19			191			—			—		—			(1,820		)	(18,802		)	353
Equity securities available for sale:
Common stocks	10,741		—			(273		)	(2,331		)	—		(308		)	—			—			7,829
Preferred stocks	3,713		(89		)	—			—			—		—			—			—			3,624
Total	14,454		(89		)	(273		)	(2,331		)	—		(308		)	—			—			11,453
Arbitrage trading account	720		(799		)	—			—			72,640		(71,921		)	—			(464		)	176
Total	$	35,939	$	(869	)	$	(82	)	$	(2,331	)	$	72,640	$	(72,229	)	$	(1,820	)	$	(19,266	)	$	11,982
Liabilities:
Trading account securities sold but not yet purchased	$	—	$	—		$	—		$	—		$	—	$	—		$	—		$	—		$	—
Year ended December 31, 2014
Assets:
Fixed maturity securities available for sale:
Asset-backed securities	$	42,710	$	47		$	(3,711	)	$	—		$	238	$	(15,244	)	$	(3,429	)	$	—		$	20,611
Corporate	$	154	$	—		$	—		$	—		$	—	$	—		$	—		$	—		$	154
Total	42,864		47			(3,711		)	—			238		(15,244		)	(3,429		)	—			20,765
Equity securities available for sale:
Common stocks	1,238		—			(911		)	—			11,343		(929		)	—			—			10,741
Preferred stocks	3,752		(17		)	—			—			3,430		(3,452		)	—			—			3,713
Total	4,990		(17		)	(911		)	—			14,773		(4,381		)	—			—			14,454
Arbitrage trading account	1,780		2,274			—			—			4,942		(14,073		)	—			5,797			720
Total	$	49,634	$	2,304		$	(4,622	)	$	—		$	19,953	$	(33,698	)	$	(3,429	)	$	5,797		$	35,939
Liabilities:
Trading account securities sold but not yet purchased	$	—	$	(20	)	$	—		$	—		$	31	$	(11	)	$	—		$	—		$	—

During the year ended December 31, 2015, five securities were transferred out of Level 3 as an observable price was available. During the year ended December 31, 2014, two securities were transferred into Level 3 as quoted prices were no longer available.

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, 2015 and 2014:

	2015				2014
(In thousands)	Carrying Value		Fair Value		Carrying Value		Fair Value
Assets:
Fixed maturity securities	$	12,444,394	$	12,462,847	$	12,705,160	$	12,725,806
Equity securities available for sale	150,866		150,866		170,991		170,991
Arbitrage trading account	376,697		376,697		450,648		450,648
Loans receivable	273,103		275,747		322,012		325,219
Cash and cash equivalents	763,631		763,631		674,441		674,441
Trading accounts receivable from brokers and clearing organizations	383,115		383,115		371,034		371,034
Due from broker	1,713		1,713		—		—
Liabilities:
Due to broker	—		—		23,133		23,133
Trading account securities sold but not yet purchased	37,035		37,035		106,079		106,079
Subordinated debentures	340,320		355,880		340,060		332,640
Senior notes and other debt	1,844,621		2,029,572		2,115,527		2,344,292

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 13 above. The fair value of loans receivable are 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, 2014

Insurance [Abstract]

Reserves For Losses And Loss Expenses

Reserves for Losses and Loss Expenses

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

(In thousands)	2015			2014			2013
Net reserves at beginning of year	$	8,970,641		$	8,683,797		$	8,411,851
Net provision for losses and loss expenses:
Claims occuring during the current year(1)	3,653,561			3,495,825			3,221,393
Decrease in estimates for claims occurring in prior years(2)(3)	(46,713		)	(75,764		)	(78,810		)
Loss reserve discount accretion(4)	49,422			70,506			54,441
Total	3,656,270			3,490,567			3,197,024
Net payments for claims:
Current year	914,637			898,944			822,787
Prior year	2,342,378			2,216,283			2,055,284
Total	3,257,015			3,115,227			2,878,071
Foreign currency translation	(125,024		)	(88,496		)	(47,007		)
Net reserves at end of year	9,244,872			8,970,641			8,683,797
Ceded reserve at end of year	1,424,278			1,399,060			1,397,144
Gross reserves at end of year	$	10,669,150		$	10,369,701		$	10,080,941

_______________________________________

(1) Claims occurring during the current year are net of loss reserve discounts of $20,357,000, $21,306,000, and $22,680,000 in 2015, 2014 and 2013, respectively.

(2) The 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 $64,971,000, $116,866,000 and $77,430,000 in 2015, 2014 and 2013, respectively.

(3) For certain retrospectively rated insurance polices and reinsurance agreements, reserve development is offset by additional or return premiums. Favorable reserve development, net of additional and return premiums, was $63 million, $85 million and $98 million in 2015, 2014 and 2013, respectively.

(4) In 2014, the Company entered into a commutation agreement that resulted in a reduction in prior year workers' compensation reserves of $30 million on an undiscounted basis and $12 million on a discounted basis.

Favorable prior year development (net of additional and return premiums) was $63 million in 2015.

Insurance-Domestic - Reserves for the Insurance-Domestic segment developed favorably by $47 million in 2015. The favorable development was primarily related to workers' compensation and other liability business, and was partially offset by unfavorable development for commercial automobile 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 2006. In 2015, reported workers' compensation losses were below our expectations for many of our operating units. In addition, overall loss frequency and severity trends emerged better than the assumptions underlying our previous reserve estimates. The long term trend of declining workers' compensation claim frequency continued in 2015. The improvement is attributable to better workplace safety and to benign medical severity trends as we continue to invest in medical case management services and higher usage of preferred provider networks.

For other liability business, favorable development was concentrated in accident years 2007 through 2013. The favorable development was primarily related to our excess and surplus lines casualty business that has benefited from a persistent improvement in claim frequency trends over the past several years.

For commercial automobile business, adverse development was primarily related to large losses for long-haul trucking business and to accident years 2011 through 2014. The higher loss cost trends for the commercial automobile industry are attributable, in part, to the increase in miles driven as the economy has improved and fuel prices have declined over the past several years.

Reinsurance-Global - Reserves for the Reinsurance-Global segment developed favorably by $11 million in 2015. The favorable development was primarily related to direct facultative reinsurance business and to accident years 2005 through 2013. Loss reserves developed favorably for umbrella business and for other liability coverage for contractors.

Insurance-International - Reserves for the Insurance-International segment developed favorably by $5 million in 2015. The favorable development was related primarily to commercial property. The favorable commercial property development was attributable to accident years 2012 through 2014 and was driven by favorable frequency and severity trends on property business written in Lloyd's. The favorable property development was partially offset by unfavorable development for professional indemnity business in the U.K., primarily for accident years 2006 through 2013.

Favorable prior year development (net of additional and return premiums) was $85 million in 2014.

For the Insurance-Domestic segment, favorable development in 2014 of $92 million was driven primarily by other liability business for accident years 2006 through 2010, primarily related to our excess and surplus lines casualty business. Reported losses during these years continued to be below our initial expectations at the time the business was written, largely as a result of persistent improvement in claim frequency trends (i.e., number of reported claims per unit of exposure). As these accident years have matured, the weighting of actuarial methods has shifted from methods based on initial expected losses to methods based on actual reported losses. We believe the favorable claim frequency trends we have seen during this time period are due to changes in the mix of business written and to the general slowdown in the economy. Commercial automobile reported unfavorable development primarily as a result of large losses for long-haul trucking business in 2012 and 2013.

For the Reinsurance-Global segment, favorable reserve development in 2014 of $16 million was driven primarily by assumed professional liability excess of loss and umbrella treaty business, as well as direct facultative business. This was partially offset by adverse development on brokerage facultative business caused by completed operations losses associated with construction projects in accident years prior to 2009.

For the Insurance-International segment, adverse reserve development in 2014 of $23 million was driven primarily by unexpected large losses from accident years 2009-2012 in the professional indemnity line of business in the United Kingdom.

Favorable prior year reserve development (net of additional and return premiums) was $98 million in 2013.

Favorable development in 2013 was primarily attributable to accident years 2006 through 2012 and included favorable development of $39 million for other liability business, $32 million for reinsurance assumed liability business, $22 million for workers’ compensation, $18 million for commercial property and $24 million for other lines of business. The favorable development in 2013 was largely driven by loss cost trends, which were more favorable than originally anticipated. In particular, loss frequency trends have been more favorable than expected for excess & surplus lines casualty business, workers' compensation and excess of loss professional and other liability business.

The 2013 favorable development was partially offset by unfavorable development of $23 million for commercial automobile business and $14 million for products liability business. Commercial automobile development was driven by large losses for long-haul trucking business in 2011 and 2012. Product liability development stemmed from completed operations losses associated with construction projects in accident years prior to 2009.

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 was $33 million at December 31, 2015 and $36 million at December 31, 2014. The Company’s gross reserves for losses and loss expenses relating to asbestos and environmental claims were $51 million and $56 million at December 31, 2015 and 2014, respectively. Net incurred losses and loss expenses for reported asbestos and environmental claims decreased approximately $2 million in 2015 and increased by approximately $4 million and $5 million in 2014 and 2013, respectively. Net paid losses and loss expenses for asbestos and environmental claims were approximately $2 million in 2015, $3 million in 2014 and $3 million in 2013. 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 $2,308 million and $2,187 million at December 31, 2015 and December 31, 2014, respectively. The aggregate net discount for those reserves, after reflecting the effects of ceded reinsurance, was $699 million and $746 million at December 31, 2015 and December 31, 2014, respectively. At December 31, 2015, discount rates by year ranged from 2.0% to 6.5%, with a weighted average discount rate of 3.9%.

Substantially all of discounted workers’ compensation reserves (98% of total discounted reserves at December 31, 2015) 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 2% of total discounted reserves at December 31, 2015), 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.

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Reinsurance

12 Months Ended

Dec. 31, 2015

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)	2015			2014			2013
Written premiums:
Direct	$	6,412,533		$	6,185,242		$	5,626,172
Assumed	837,460			877,596			884,919
Ceded	(1,060,478		)	(1,065,891		)	(1,010,918		)
Total net written premiums	$	6,189,515		$	5,996,947		$	5,500,173
Earned premiums:
Direct	$	6,245,714		$	5,889,021		$	5,328,955
Assumed	845,735			886,063			857,119
Ceded	(1,050,840		)	(1,030,666		)	(959,537		)
Total net earned premiums	$	6,040,609		$	5,744,418		$	5,226,537
Ceded losses and loss expenses incurred	$	501,999		$	475,802		$	556,108
Ceded commission earned	$	129,766		$	160,215		$	137,449

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 $1,020,000, $1,144,000 and $1,385,000 as of December 31, 2015, 2014 and 2013, respectively.

The following table presents the amounts due from reinsurers as of December 31, 2015:

(In thousands)
Allegany Group	$	138,163
Munich Re	121,661
Swiss Re	115,215
Lloyd’s of London	92,635
Axis Capital	69,840
Partner Re	65,793
Hannover Re Group	48,675
Everest Re	47,945
Berkshire Hathaway	47,309
Chubb Limited (1)	45,645
Arch Capital Group	23,273
Other reinsurers less than $20,000	213,169
Subtotal	1,029,323
Residual market pools	503,506
Total	$	1,532,829

(1) Includes the aggregate recoverables from Ace Group and Chubb Group.

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Indebtedness

12 Months Ended

Dec. 31, 2014

Senior Notes and Other Debt

Debt Instrument [Line Items]

Senior Notes And Other Debt

Indebtedness

Indebtedness consisted of the following as of December 31, 2015 (the difference between the face value and the carrying value is unamortized discount):

(In thousands)	Interest Rate	Face Value		2015 Carrying Value		2014 Carrying Value
Senior notes due on:
May 15, 2015	5.6%	$	—	$	—	$	199,930
August 15, 2019	6.15%	150,000		149,484		149,342
September 15, 2019	7.375%	300,000		299,054		298,800
September 15, 2020	5.375%	300,000		298,411		298,074
January 1, 2022	8.7%	76,503		76,097		76,048
March 15, 2022	4.625%	350,000		347,417		346,999
February 15, 2037	6.25%	250,000		247,676		247,566
August 1, 2044	4.75%	350,000		344,730		344,545
Subsidiary debt (1)	Various	81,752		81,752		154,223
Total senior notes and other debt		$	1,858,255	$	1,844,621	$	2,115,527
Subordinated debentures, due on April, 30, 2053	5.625%	$	350,000	$	340,320	$	340,060

_____________

(1) Subsidiary debt is due as follows: $43 million in 2016, $37 million in 2017 and $2 million thereafter.

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Income Taxes

12 Months Ended

Dec. 31, 2015

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

Income tax expense consists of:

(In thousands)	Current Expense			Deferred Expense		Total
December 31, 2015
Domestic	$	179,150		$	31,145	$	210,295
Foreign	(2,318		)	19,946		17,628
Total expense	$	176,832		$	51,091	$	227,923
December 31, 2014
Domestic	$	258,337		$	28,029	$	286,366
Foreign	12,969			3,258		16,227
Total expense	$	271,306		$	31,287	$	302,593
December 31, 2013
Domestic	$	116,802		$	47,370	$	164,172
Foreign	22,362			7,053		29,415
Total expense	$	139,164		$	54,423	$	193,587

Income before income taxes from domestic operations was $689 million, $910 million and $598 million for the years ended December 31, 2015, 2014 and 2013, respectively. Income before income taxes from foreign operations was $43 million, $42 million and $101 million for the years ended December 31, 2015, 2014 and 2013, respectively.

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

(In thousands)	2015			2014			2013
Computed “expected” tax expense	$	256,210		$	333,269		$	244,611
Tax-exempt investment income	(39,283		)	(38,757		)	(40,679		)
Change in valuation allowance	2,702			1,335			—
Impact of foreign tax rates	4,447			6,239			(4,851		)
State and local taxes	940			2,375			2,906
Other, net	2,907			(1,868		)	(8,400		)
Total expense	$	227,923		$	302,593		$	193,587

At December 31, 2015 and 2014, 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)	2015			2014
Deferred tax asset:
Loss reserve discounting	$	100,806		$	77,216
Unearned premiums	176,465			165,075
Other-than-temporary impairments	26,509			45,367
Restricted stock units	62,442			60,061
Other	89,761			101,131
Gross deferred tax asset	455,983			448,850
Less valuation allowance	(4,037		)	(1,335		)
Deferred tax asset	451,946			447,515
Deferred tax liability:
Amortization of intangibles	20,316			22,747
Deferred policy acquisition costs	162,344			152,001
Unrealized investment gains	115,499			175,111
Other	160,598			135,108
Deferred tax liability	458,757			484,967
Net deferred tax asset (liability)	$	(6,811	)	$	(37,452	)

The Company had current tax receivables of $55,763,000 and $67,623,000 at December 31, 2015 and 2014, respectively. At December 31, 2015, the Company had foreign net operating loss carryforwards $6.1 million that expire beginning in 2031, and an additional $43.2 million that have no expiration date. At December 31, 2015, the Company had a valuation allowance of $4.0 million, as compared to $1.3 million at December 31, 2014. The Company has provided a valuation allowance against future tax benefits of certain foreign operations. The statute of limitations has closed for the Company’s tax returns through December 31, 2011.

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.

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Dividends From Subsidiaries And Statutory Financial Information

12 Months Ended

Dec. 31, 2015

Insurance [Abstract]

Dividends From Subsidiaries And Statutory Financial Information (Unaudited)

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 2016, the maximum amount of dividends that can be paid by BIC without such approval is approximately $684 million.

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

(In thousands)	2015		2014		2013
Net income	$	813,303	$	757,010	$	468,850
Statutory capital and surplus	$	5,296,435	$	5,438,063	$	4,908,010

The significant variances between SAP and GAAP are that for statutory purposes bonds are carried at amortized cost, 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 to increase BIC’s statutory capital and surplus by $294 million at December 31, 2015.

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, 2015, BIC’s Total Adjusted Capital of $5.002 billion was 456% of its RBC Authorized Control Level.

See Note 4, 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, 2015

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:

	2015	2014	2013
Basic	124,040,313	127,873,708	135,304,752
Diluted	130,188,866	133,651,855	140,742,922

Treasury shares have been excluded from average outstanding shares from the date of acquisition. 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 and unexercised stock options.

	2015		2014		2013
Balance, beginning of year	126,748,836		132,233,167		136,017,732
Shares issued	1,061,026		332,137		139,790
Shares repurchased	(4,502,025	)	(5,816,468	)	(3,924,355)
Balance, end of year	123,307,837		126,748,836		132,233,167

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, 2015

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 on a recurring basis as of December 31, 2015 and 2014 by level:

(In thousands)	Total		Level 1		Level 2		Level 3
December 31, 2015
Assets:
Fixed maturity securities available for sale:
U.S. government and government agency	$	670,419	$	—	$	670,419	$	—
State and municipal	4,460,179		—		4,460,179		—
Mortgage-backed securities	1,199,859		—		1,199,859		—
Asset-backed securities	1,705,172		—		1,704,973		199
Corporate	3,475,038		—		3,474,884		154
Foreign government	837,460		—		837,460		—
Total fixed maturity securities available for sale	12,348,127		—		12,347,774		353
Equity securities available for sale:
Common stocks	37,273		29,444		—		7,829
Preferred stocks	113,593		—		109,969		3,624
Total equity securities available for sale	150,866		29,444		109,969		11,453
Arbitrage trading account	376,697		256,914		119,607		176
Total	$	12,875,690	$	286,358	$	12,577,350	$	11,982
Liabilities:
Trading account securities sold but not yet purchased	$	37,035	$	35,559	$	1,476	$	—
December 31, 2014
Assets:
Fixed maturity securities available for sale:
U.S. government and government agency	$	803,388	$	—	$	803,388	$	—
State and municipal	4,362,996		—		4,362,996		—
Mortgage-backed securities	1,295,636		—		1,295,636		—
Asset-backed securities	2,025,926		—		2,005,315		20,611
Corporate	3,174,211		—		3,174,057		154
Foreign government	941,826		—		941,826		—
Total fixed maturity securities available for sale	12,603,983		—		12,583,218		20,765
Equity securities available for sale:
Common stocks	76,346		65,605		—		10,741
Preferred stocks	94,645		—		90,932		3,713
Total equity securities available for sale	170,991		65,605		90,932		14,454
Arbitrage trading account	450,648		295,047		154,881		720
Total	$	13,225,622	$	360,652	$	12,829,031	$	35,939
Liabilities:
Trading account securities sold but not yet purchased	$	106,079	$	106,074	$	5	$	—

There were no significant transfers between Levels 1 and 2 for the years ended December 31, 2015 and 2014.

The following tables summarize changes in Level 3 assets and liabilities for the years ended December 31, 2015 and 2014:

	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, 2015
Assets:
Fixed maturity securities available for sale:
Asset-backed securities	$	20,611	$	19		$	191		$	—		$	—	$	—		$	(1,820	)	$	(18,802	)	$	199
Corporate	154		—			—			—			—		—			—			—			154
Total	20,765		19			191			—			—		—			(1,820		)	(18,802		)	353
Equity securities available for sale:
Common stocks	10,741		—			(273		)	(2,331		)	—		(308		)	—			—			7,829
Preferred stocks	3,713		(89		)	—			—			—		—			—			—			3,624
Total	14,454		(89		)	(273		)	(2,331		)	—		(308		)	—			—			11,453
Arbitrage trading account	720		(799		)	—			—			72,640		(71,921		)	—			(464		)	176
Total	$	35,939	$	(869	)	$	(82	)	$	(2,331	)	$	72,640	$	(72,229	)	$	(1,820	)	$	(19,266	)	$	11,982
Liabilities:
Trading account securities sold but not yet purchased	$	—	$	—		$	—		$	—		$	—	$	—		$	—		$	—		$	—
Year ended December 31, 2014
Assets:
Fixed maturity securities available for sale:
Asset-backed securities	$	42,710	$	47		$	(3,711	)	$	—		$	238	$	(15,244	)	$	(3,429	)	$	—		$	20,611
Corporate	$	154	$	—		$	—		$	—		$	—	$	—		$	—		$	—		$	154
Total	42,864		47			(3,711		)	—			238		(15,244		)	(3,429		)	—			20,765
Equity securities available for sale:
Common stocks	1,238		—			(911		)	—			11,343		(929		)	—			—			10,741
Preferred stocks	3,752		(17		)	—			—			3,430		(3,452		)	—			—			3,713
Total	4,990		(17		)	(911		)	—			14,773		(4,381		)	—			—			14,454
Arbitrage trading account	1,780		2,274			—			—			4,942		(14,073		)	—			5,797			720
Total	$	49,634	$	2,304		$	(4,622	)	$	—		$	19,953	$	(33,698	)	$	(3,429	)	$	5,797		$	35,939
Liabilities:
Trading account securities sold but not yet purchased	$	—	$	(20	)	$	—		$	—		$	31	$	(11	)	$	—		$	—		$	—

During the year ended December 31, 2015, five securities were transferred out of Level 3 as an observable price was available. During the year ended December 31, 2014, two securities were transferred into Level 3 as quoted prices were no longer available.

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, 2015 and 2014:

	2015				2014
(In thousands)	Carrying Value		Fair Value		Carrying Value		Fair Value
Assets:
Fixed maturity securities	$	12,444,394	$	12,462,847	$	12,705,160	$	12,725,806
Equity securities available for sale	150,866		150,866		170,991		170,991
Arbitrage trading account	376,697		376,697		450,648		450,648
Loans receivable	273,103		275,747		322,012		325,219
Cash and cash equivalents	763,631		763,631		674,441		674,441
Trading accounts receivable from brokers and clearing organizations	383,115		383,115		371,034		371,034
Due from broker	1,713		1,713		—		—
Liabilities:
Due to broker	—		—		23,133		23,133
Trading account securities sold but not yet purchased	37,035		37,035		106,079		106,079
Subordinated debentures	340,320		355,880		340,060		332,640
Senior notes and other debt	1,844,621		2,029,572		2,115,527		2,344,292

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 13 above. The fair value of loans receivable are 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, 2015

Leases [Abstract]

Lease Obligations

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: $42,470,000 in 2016; $39,443,000 in 2017; $35,286,000 in 2018; $30,941,000 in 2019; $28,584,000 in 2020 and $105,825,000 thereafter. Rental expense was $46,271,000, $45,198,000 and $44,752,000 for 2015, 2014 and 2013, respectively.

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Commitments, Litigation And Contingent Liabilities

12 Months Ended

Dec. 31, 2015

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, 2015, the Company had commitments to invest up to $117 million and $485 million in certain investment funds and real estate construction projects, respectively.

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Stock Incentive Plan

12 Months Ended

Dec. 31, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock Incentive Plan

Stock Incentive Plan

The Company has not issued any stock options under its stock incentive plans since 2004, and there were no outstanding options at December 31, 2015 and December 31, 2014.

Pursuant to the 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, 2015:

	2015		2014		2013
RSUs granted and unvested at beginning of period:	5,330,445		4,491,520		4,701,120
Granted	997,522		1,154,950		108,400
Vested	(1,938,000	)	(81,500	)	(146,250	)
Canceled	(231,642	)	(234,525	)	(171,750	)
RSUs granted and unvested at end of period:	4,158,325		5,330,445		4,491,520

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, 2015, 4,275,474 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, 2015:

(In thousands)	2015			2014			2013
Unearned compensation at beginning of year	$	88,015		$	73,205		$	93,653
RSUs granted, net of cancellations	50,442			51,575			4,406
RSUs expensed	(30,691		)	(27,966		)	(22,881		)
RSUs forfeitures	(4,228		)	(8,799		)	(1,973		)
Unearned compensation at end of year	$	103,538		$	88,015		$	73,205

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Compensation Plans

12 Months Ended

Dec. 31, 2015

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 will 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, $38 million, and $34 million in 2015, 2014 and 2013, respectively.

The Company has a long-term incentive compensation plan ("LTIP") that provides for incentive 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, 2015:

	Units Outstanding	Maximum Value		Inception to date earned through December 31, 2015 on outstanding units
2011 grant	172,850	$	43,212,500	$	34,331,000
2013 grant	204,500	51,125,000		23,804,000
2014 grant	216,750	21,675,000		6,559,000
2015 grant	213,250	21,325,000		3,205,000

The following table summarizes the LTIP expense for each of the three years ended December 31, 2015:

(In thousands)	2015		2014		2013
2011 grant	$	7,397	$	9,855	$	6,939
2013 grant	7,336		9,493		7,231
2014 grant	2,935		3,663		—
2015 grant	3,205		—		—
Total	$	20,873	$	23,011	$	14,170

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Retirement Benefits

12 Months Ended

Dec. 31, 2015

Compensation and Retirement Disclosure [Abstract]

Retirement Benefits

Retirement Benefits

The Company and its executive chairman of the board entered into an unfunded supplemental benefit agreement (SBA) in 2004. On March 28, 2013, the Company agreed to terminate and distribute the retirement benefit of the SBA. As a result, the Company distributed retirement benefits of $0.3 million and $4.6 million in 2013 and 2014, respectively. The final retirement benefit of $59.4 million, which was fully accrued at December 31, 2014, was distributed in 2015. Net retirement benefit expense was $13,357,000, $9,994,000 and none in 2013, 2014, and 2015 respectively.

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Supplemental Financial Statement Information

12 Months Ended

Dec. 31, 2015

Other Income and Expenses [Abstract]

Supplemental Financial Statement Data

Supplemental Financial Statement Data

Other operating costs and expenses consist of the following:

(In thousands)	2015		2014			2013
Amortization of deferred policy acquisition costs	$	1,102,492	$	1,053,397		$	991,070
Other underwriting expenses	903,006		843,133			780,058
Service company expenses	127,365		102,726			88,662
Net foreign currency losses (gains)	400		(27		)	(10,120		)
Other costs and expenses	156,487		158,227			151,014
Total	$	2,289,750	$	2,157,456		$	2,000,684

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Industry Segments

12 Months Ended

Dec. 31, 2015

Segment Reporting [Abstract]

Industry Segments

Industry Segments

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

• Insurance-Domestic - commercial insurance business, including excess and surplus lines and admitted lines, primarily throughout the United States;

• Insurance-International - insurance business primarily in the United Kingdom, Continental Europe, South America, Canada, Scandinavia, Asia, and Australia;

• Reinsurance-Global - 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 (loss) 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		Pre-Tax Income (Loss)			Net Income (Loss)
December 31, 2015:
Insurance-Domestic	$	4,659,359	$	358,935	$	96,487	$	5,114,781	$	724,667		$	495,082
Insurance-International	772,141		51,522		—		823,663		51,926			37,204
Reinsurance-Global	609,109		74,226		—		683,335		94,852			66,627
Corporate, other and eliminations(1)	—		27,962		464,392		492,354		(231,739		)	(155,230		)
Net investment gains	—		—		92,324		92,324		92,324			60,011
Consolidated	$	6,040,609	$	512,645	$	653,203	$	7,206,457	$	732,030		$	503,694
December 31, 2014:
Insurance-Domestic	$	4,271,933	$	428,632	$	106,853	$	4,807,418	$	796,309		$	539,461
Insurance-International	802,375		55,407		—		857,782		29,779			22,182
Reinsurance-Global	670,110		88,821		—		758,931		115,677			79,720
Corporate, other and eliminations(1)	—		28,025		421,920		449,945		(244,421		)	(158,133		)
Net investment gains	—		—		254,852		254,852		254,852			165,654
Consolidated	$	5,744,418	$	600,885	$	783,625	$	7,128,928	$	952,196		$	648,884
December 31, 2013:
Insurance-Domestic	$	3,782,416	$	404,280	$	107,517	$	4,294,213	$	648,740		$	449,981
Insurance-International	723,151		47,039		—		770,190		56,922			40,292
Reinsurance-Global	720,970		89,090		—		810,060		110,425			78,013
Corporate, other and eliminations(1)	—		3,882		408,645		412,527		(238,743		)	(142,479		)
Net investment gains	—		—		121,544		121,544		121,544			74,118
Consolidated	$	5,226,537	$	544,291	$	637,706	$	6,408,534	$	698,888		$	499,925

Identifiable Assets
(In thousands)	December 31, 2015		December 31, 2014
Insurance-Domestic	$	16,351,737	$	16,065,409
Insurance-International	1,711,993		1,879,438
Reinsurance-Global	2,441,340		2,713,554
Corporate, other and eliminations(1)	1,225,897		1,058,290
Consolidated	$	21,730,967	$	21,716,691

_______________________________________

(1) 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)	2015		2014		2013
Insurance-Domestic
Other liability	$	1,546,157	$	1,449,425	$	1,259,376
Workers' compensation	1,269,785		1,126,704		995,047
Short-tail lines	925,468		875,898		774,809
Commercial automobile	548,450		526,344		486,759
Professional liability	369,499		293,562		266,425
Total Insurance-Domestic	4,659,359		4,271,933		3,782,416
Insurance-International
Other liability	103,974		92,411		65,528
Workers' compensation	93,728		71,997		84,637
Short-tail lines	373,415		415,123		336,814
Commercial automobile	125,628		116,369		130,020
Professional liability	75,396		106,475		106,152
Total Insurance-International	772,141		802,375		723,151
Reinsurance-Global
Casualty	421,811		487,264		507,790
Property	187,298		182,846		213,180
Total Reinsurance-Global	609,109		670,110		720,970
Total	$	6,040,609	$	5,744,418	$	5,226,537

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Quarterly Financial Information (Unaudited)

12 Months Ended

Dec. 31, 2015

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)	2015
Three months ended	March 31		June 30		September 30		December 31
Revenues	$	1,744,679	$	1,789,765	$	1,860,957	$	1,811,056
Net income	118,307		123,035		152,607		109,745
Net income per share(1)
Basic	0.94		0.99		1.24		0.89
Diluted	0.89		0.95		1.18		0.85

	2014
Three months ended	March 31		June 30		September 30		December 31
Revenues	$	1,706,906	$	1,796,989	$	1,840,605	$	1,784,428
Net income	169,673		179,961		188,539		110,711
Net income per share(1)
Basic	1.31		1.41		1.48		0.87
Diluted	1.25		1.35		1.42		0.83

_______________________________________

(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.

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Schedule II - Condensed Financial Information of Registrant

12 Months Ended

Dec. 31, 2013

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)	2015			2014
Assets:
Cash and cash equivalents	$	195,658		$	90,693
Fixed maturity securities available for sale at fair value (cost $201,256 and $272,283 at December 31, 2015 and 2014, respectively)	201,738			273,773
Equity securities available for sale, at fair value (cost $3,430 in 2015 and $3,738 in 2014)	3,430			3,738
Investment in subsidiaries	6,454,065			6,693,731
Deferred Federal income taxes	37,135			—
Current Federal income taxes	51,512			62,882
Property, furniture and equipment at cost, less accumulated depreciation	13,150			9,852
Other assets	6,153			6,978
Total assets	$	6,962,841		$	7,141,647
Liabilities and stockholders’ equity
Liabilities:
Due to subsidiaries	$	143,669		$	87,540
Other liabilities	115,737			162,648
Deferred Federal income taxes	—			149
Subordinated debentures	340,320			340,060
Senior notes	1,762,869			1,961,305
Total liabilities	2,362,595			2,551,702
Stockholders’ equity:
Preferred stock	—			—
Common stock	47,024			47,024
Additional paid-in capital	1,005,455			991,512
Retained earnings (including accumulated undistributed net income of subsidiaries of $4,746,934 and $4,700,821 at December 31, 2015 and 2014, respectively)	6,178,070			5,732,410
Accumulated other comprehensive income (loss)	(66,698		)	183,550
Treasury stock, at cost	(2,563,605		)	(2,364,551		)
Total stockholders’ equity	4,600,246			4,589,945
Total liabilities and stockholders’ equity	$	6,962,841		$	7,141,647

________________

See accompanying 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)

	Years Ended December 31,
(In thousands)	2015			2014			2013
Management fees and investment income including dividends from subsidiaries of $642,421, $503,483, and $269,626 for the years ended December 31, 2015, 2014 and 2013, respectively	$	655,318		$	515,775		$	277,223
Net investment gains	696			5,487			24,550
Other income	348			450			223
Total revenues	656,362			521,712			301,996
Operating costs and expense	143,391			148,288			122,562
Interest expense	128,248			125,352			120,066
Income before federal income taxes	384,723			248,072			59,368
Federal income taxes:
Federal income taxes provided by subsidiaries on a separate return basis	272,180			366,721			225,845
Federal income tax expense on a consolidated return basis	(199,322		)	(273,310		)	(154,928		)
Net expense	72,858			93,411			70,917
Income before undistributed equity in net income of subsidiaries	457,581			341,483			130,285
Equity in undistributed net income of subsidiaries	46,113			307,401			369,640
Net income	$	503,694		$	648,884		$	499,925

________________

See accompanying 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)

	Years Ended December 31,
(In thousands)	2015			2014			2013
Cash flows from (used in) from operating activities:
Net income	$	503,694		$	648,884		$	499,925
Adjustments to reconcile net income to net cash from operating activities:
Net investment gains	(696		)	(5,487		)	(24,550		)
Depreciation and amortization	2,693			2,916			10,397
Equity in undistributed earnings of subsidiaries	(46,113		)	(307,401		)	(369,640		)
Tax payments received from subsidiaries	311,482			462,809			77,305
Federal income taxes provided by subsidiaries on a separate return basis	(272,180		)	(366,721		)	(225,845		)
Stock incentive plans	29,725			28,068			23,784
Change in:
Federal income taxes	51,772			(15,239		)	21,866
Other assets	301			(364		)	(821		)
Other liabilities	(92,752		)	(39,780		)	(15,470		)
Accrued investment income	524			(820		)	967
Net cash from (used in) operating activities	488,450			406,865			(2,082		)
Cash from (used in) investing activities:
Proceeds from sales of fixed maturity securities	380,986			289,683			230,854
Proceeds from maturities and prepayments of fixed maturity securities	123,639			103,646			68,918
Proceeds from sales of equity securities	308			7,356			23,395
Cost of purchases of fixed maturity securities	(432,645		)	(605,768		)	(79,132		)
Cost of purchases of equity securities	—			—			(4,668		)
Cost of acquired companies	—			(82,879		)	—
Investments in and advances to subsidiaries, net	30,338			34,191			(58,454		)
Change in balance due to security broker	—			(2,151		)	6,918
Net additions to real estate, furniture & equipment	(4,425		)	(1,615		)	(1,896		)
Net cash from (used in) investing activities	98,201			(257,537		)	185,935
Cash from (used in) financing activities:
Net proceeds from issuance of senior notes	—			344,472			339,627
Net proceeds from stock options exercised	—			—			53
Repayment of senior notes	(200,000		)	—			(450,000		)
Purchase of common treasury shares	(223,652		)	(238,933		)	(166,473		)
Cash dividends to common stockholders	(58,034		)	(181,489		)	(52,717		)
Net cash from (used in) financing activities	(481,686		)	(75,950		)	(329,510		)
Net increase (decrease) in cash and cash equivalents	104,965			73,378			(145,657		)
Cash and cash equivalents at beginning of year	90,693			17,315			162,972
Cash and cash equivalents at end of year	$	195,658		$	90,693		$	17,315

________________

See accompanying 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, 2015

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 2014 and 2013 financial statements as originally reported to conform them to the presentation of the 2015 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, 2015

Supplementary Insurance Information [Abstract]

Schedule III - Supplementary Insurance Information

Schedule III

W. R. Berkley Corporation and Subsidiaries

Supplementary Insurance Information

December 31, 2015, 2014 and 2013

(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 Cost and Expenses		Net Premiums Written
December 31, 2015
Insurance-Domestic	$	367,977	$	8,450,190	$	2,529,931	$	4,659,359	$	358,935	$	2,851,136	$	760,020	$	778,957	$	4,812,830
Insurance-International	62,687		798,116		324,530		772,141		51,522		449,147		169,962		152,629		778,567
Reinsurance-Global	82,464		1,420,844		282,672		609,109		74,226		355,987		172,510		59,986		598,118
Corporate and adjustments	—		—		—		—		27,962		—		—		195,686		—
Total	$	513,128	$	10,669,150	$	3,137,133	$	6,040,609	$	512,645	$	3,656,270	$	1,102,492	$	1,187,258	$	6,189,515
December 31, 2014
Insurance-Domestic	$	347,261	$	8,000,863	$	2,384,511	$	4,271,933	$	428,632	$	2,571,010	$	710,141	$	729,958	$	4,517,587
Insurance-International	60,900		855,852		342,746		802,375		55,407		503,997		173,877		150,129		828,076
Reinsurance-Global	80,364		1,512,986		299,475		670,110		88,821		415,560		169,379		58,315		651,284
Corporate and adjustments	—		—		—		—		28,025		—		—		165,657		—
Total	$	488,525	$	10,369,701	$	3,026,732	$	5,744,418	$	600,885	$	3,490,567	$	1,053,397	$	1,104,059	$	5,996,947
December 31, 2013
Insurance-Domestic	$	306,464	$	7,715,124	$	2,107,768	$	3,782,416	$	404,280	$	2,318,541	$	651,524	$	671,096	$	3,994,387
Insurance-International	60,751		672,009		317,691		723,151		47,039		429,900		152,843		124,497		756,185
Reinsurance-Global	84,886		1,693,808		355,978		720,970		89,090		448,583		186,703		64,567		749,601
Corporate and adjustments	—		—		—		—		3,882		—		—		149,454		—
Total	$	452,101	$	10,080,941	$	2,781,437	$	5,226,537	$	544,291	$	3,197,024	$	991,070	$	1,009,614	$	5,500,173

See accompanying Report of Independent Registered Public Accounting Firm.

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Schedule IV - Reinsurance

12 Months Ended

Dec. 31, 2015

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, 2015, 2014 and 2013

	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, 2015:
Insurance-Domestic	$	5,521,447	$	871,358	$	162,741	$	4,812,830	3.4	%
Insurance-International	874,359		144,737		48,945		778,567		6.3	%
Reinsurance-Global	16,727		44,383		625,774		598,118		104.6	%
Total	$	6,412,533	$	1,060,478	$	837,460	$	6,189,515	13.5	%
Year ended December 31, 2014:
Insurance-Domestic	$	5,214,849	$	866,092	$	168,830	$	4,517,587	3.7	%
Insurance-International	927,799		156,195		56,472		828,076		6.8	%
Reinsurance-Global	42,594		43,604		652,294		651,284		100.2	%
Total	$	6,185,242	$	1,065,891	$	877,596	$	5,996,947	14.6	%
Year ended December 31, 2013:
Insurance-Domestic	$	4,699,348	$	809,368	$	104,407	$	3,994,387	2.6	%
Insurance-International	887,027		142,591		11,749		756,185		1.6	%
Reinsurance-Global	39,797		58,959		768,763		749,601		102.6	%
Total	$	5,626,172	$	1,010,918	$	884,919	$	5,500,173	16.1	%

See accompanying Report of Independent Registered Public Accounting Firm.

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Schedule V - Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2015

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, 2015, 2014 and 2013

(In thousands)	Opening Balance		Additions- Charged to Expense			Deduction- Amounts Written Off			Ending Balance
Year ended December 31, 2015:
Premiums and fees receivable	$	21,446	$	6,281		$	(5,203	)	$	22,524
Due from reinsurers	1,144		(24		)	(100		)	1,020
Deferred federal and foreign income taxes	1,335		2,702			—			4,037
Loan loss reserves	2,486		(392		)	—			2,094
Total	$	26,411	$	8,567		$	(5,303	)	$	29,675
Year ended December 31, 2014:
Premiums and fees receivable	$	20,951	$	5,944		$	(5,449	)	$	21,446
Due from reinsurers	1,385		301			(542		)	1,144
Deferred federal and foreign income taxes	—		1,335			—			1,335
Loan loss reserves	2,087		399			—			2,486
Total	$	24,423	$	7,979		$	(5,991	)	$	26,411
Year ended December 31, 2013:
Premiums and fees receivable	$	22,919	$	3,133		$	(5,101	)	$	20,951
Due from reinsurers	1,680		186			(481		)	1,385
Loan loss reserves	5,620		308			(3,841		)	2,087
Total	$	30,219	$	3,627		$	(9,423	)	$	24,423

See accompanying 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, 2015

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, 2015, 2014 and 2013

(In thousands)	2015			2014			2013
Deferred policy acquisition costs	$	513,128		$	488,525		$	452,101
Reserves for losses and loss expenses	10,669,150			10,369,701			10,080,941
Unearned premium	3,137,133			3,026,732			2,781,437
Net premiums earned	6,040,609			5,744,418			5,226,537
Net investment income	512,645			600,885			544,291
Losses and loss expenses incurred:
Current year	3,653,561			3,495,825			3,221,393
Prior years	(46,713		)	(75,764		)	(78,810		)
Loss reserve discount accretion	49,422			70,506			54,441
Amortization of deferred policy acquisition costs	1,102,492			1,053,397			991,070
Paid losses and loss expenses	3,257,015			3,115,227			2,878,071
Net premiums written	6,189,515			5,996,947			5,500,173

See accompanying Report of Independent Registered Public Accounting Firm.

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Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2015

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 2014 and 2013 financial statements to conform to the presentation of the 2015 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 increased net premiums written and premiums earned by $3 million, $9 million and $12 million in 2015, 2014 and 2013, respectively.

Revenues from wholly-owned investees are derived from aircraft services provided to the general, commercial and military aviation markets. These 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 parts, the delivery of aircraft, the delivery of fuel, and upon completion of services.

Cash and cash equivalents

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.

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 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.

Equity and 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. For certain investment funds, the Company's share of the earnings or losses is 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 13 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. Since equity securities do not have a contractual cash flow or a maturity, the Company considers whether the price of an equity security is expected to recover within a reasonable period of time.

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.,thepresent 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. Diluted EPS is based upon the weighted average number of common 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. Stock options for which the exercise price exceeds the average market price over the period have an anti-dilutive effect on EPS and, accordingly, are excluded from the calculation.

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 for each of their major lines of business. 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.

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 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, unrealized foreign currency translation adjustments and changes in unrecognized pension obligations.

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

Stock options

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.

Recent accounting pronouncements

Recent accounting pronouncements

The accounting and reporting standards that became effective in 2015 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 May 2014, the Financial Accounting Standards  Board (FASB) issued Accounting Standards Update (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 will be 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, is effective for public business entities for annual and interim reporting periods beginning after December 15, 2017.  The adoption of this guidance is not expected to have a material effect on the Company’s financial condition or results of operations.

In February 2015, the FASB issued ASU 2015-02, Consolidation.  ASU 2015-02 makes targeted amendments to the current consolidation accounting guidance, in response to accounting complexity concerns. The guidance simplifies consolidation accounting by reducing the number of approaches to consolidation.  The updated guidance is effective for annual and interim reporting periods beginning after December 15, 2015. The adoption of this guidance is not expected to have a material effect on the Company’s financial condition or results of operations, but will result in additional disclosures.

In May 2015, the FASB issued ASU 2015-09, Disclosures about Short-Duration Contracts.   ASU 2015-09 requires companies that issue short duration insurance contracts to disclose additional information, including: (i) incurred and paid claims development tables; (ii) frequency and severity of claims; and (iii) information about material changes in judgments made in calculating the liability for unpaid claim adjustment expenses, including reasons for the change and the effects on the financial statements. ASU 2015-09 is effective for annual periods beginning after December 15, 2015, and interim periods within annual periods beginning after December 15, 2016. The amendments in ASU 2015-09 should be applied retrospectively by providing comparative disclosures for each period presented, except for those requirements that apply only to the current period. As the requirements of this literature are disclosure only, the adoption of this guidance will not impact our financial condition or results of operations.

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 to be 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).  The updated guidance is effective for public business entities for annual reporting periods beginning after December 15, 2017 and interim periods within those years.  The adoption of this guidance is not expected to have a material effect on the Company’s financial condition upon adoption, but will impact results of operations after adoption of this guidance as unrealized gains and losses on equity securities will no longer be reported directly in AOCI, but will instead be reported in net income.

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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Acquisitions (Tables)

12 Months Ended

Dec. 31, 2015

Business Combinations [Abstract]

Schedule of estimated fair value of net assets acquired and liabilities assumed

(In thousands)	2014
Cash and cash equivalents	$	17,457
Real estate, furniture and equipment	669
Goodwill and other intangibles assets	79,646
Premium and service fee receivable	24,432
Other assets	2,590
Total assets acquired	124,794
Deferred federal income tax	(7,107		)
Debt	—
Other liabilities assumed	(34,809		)
Net assets acquired	$	82,878

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Consolidated Statement of Comprehensive Income (Loss) (Tables)

12 Months Ended

Dec. 31, 2015

Equity [Abstract]

Components of Changes in Accumulated Other Comprehensive Income (Loss) (AOCI)

The following table presents the components of the changes in accumulated other comprehensive income (loss) (AOCI) as of and for the year ended December 31, 2015:

(In thousands)	Unrealized investment gains (losses)				Currency translation adjustments			Net pension asset		Accumulated other comprehensive income (loss)
Changes in AOCI
Beginning of period	$	306,199			$	(122,649	)	$	—	$	183,550
Other comprehensive income (loss) before reclassifications	(119,994		)		(124,744		)	—		(244,738		)
Amounts reclassified from AOCI	(5,548		)		—			—		(5,548		)
Other comprehensive income (loss)	(125,542		)		(124,744		)	—		(250,286		)
Unrealized investment gain related to non-controlling interest	38				—			—		38
Ending balance	$	180,695			$	(247,393	)	$	—	$	(66,698	)
Amounts reclassified from AOCI
Pre-tax	$	(8,535	)	(1)	$	—		$	—	$	(8,535	)
Tax effect	2,987			(2)	—			—		2,987
After-tax amounts reclassified	$	(5,548	)		$	—		$	—	$	(5,548	)
Other comprehensive income (loss)
Pre-tax	$	(192,186	)		$	(124,744	)	$	—	$	(316,930	)
Tax effect	66,644				—			—		66,644
Other comprehensive income (loss)	$	(125,542	)		$	(124,744	)	$	—	$	(250,286	)

The following table presents the components of the changes in accumulated other comprehensive income (loss) (AOCI) as of and for the year ended December 31, 2014:

(In thousands)	Unrealized investment gains (losses)				Currency translation adjustments			Net pension asset				Accumulated other comprehensive income (loss)
Changes in AOCI
Beginning of period	$	256,566			$	(60,524	)	$	(6,651	)		$	189,391
Other comprehensive income (loss) before reclassifications	98,294				(62,125		)	—				36,169
Amounts reclassified from AOCI	(48,628		)		—			6,651				(41,977		)
Other comprehensive income (loss)	49,666				(62,125		)	6,651				(5,808		)
Unrealized investment gain related to non-controlling interest	(33		)		—			—				(33		)
Ending balance	$	306,199			$	(122,649	)	$	—			$	183,550
Amounts reclassified from AOCI
Pre-tax	$	(74,812	)	(1)	$	—		$	10,232		(3)	$	(64,580	)
Tax effect	26,184			(2)	—			(3,581		)	(2)	22,603
After-tax amounts reclassified	$	(48,628	)		$	—		$	6,651			$	(41,977	)
Other comprehensive income (loss)
Pre-tax	$	72,889			$	(62,125	)	$	10,232			$	20,996
Tax effect	(23,223		)		—			(3,581		)		(26,804		)
Other comprehensive income (loss)	$	49,666			$	(62,125	)	$	6,651			$	(5,808	)

_______________

(1) Net investment gains in the consolidated statements of income.

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

(3) Other operating costs and expenses in the consolidated statements of income.

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Investments In Fixed Maturity Securities (Tables) - Debt Securities

12 Months Ended

Dec. 31, 2015

Dec. 31, 2013

Schedule of Marketable Securities [Line Items]

Investments In Fixed Maturity Securities

At December 31, 2015 and 2014, investments in fixed maturity securities were as follows:

(In thousands)	Amortized Cost		Gross Unrealized					Fair Value		Carrying Value
			Gains		Losses
December 31, 2015
Held to maturity:
State and municipal	$	77,129	$	16,246	$	—		$	93,375	$	77,129
Residential mortgage-backed	19,138		2,207		—			21,345		19,138
Corporate	—		—		—			—		—
Total held to maturity	96,267		18,453		—			114,720		96,267
Available for sale:
U.S. government and government agency	645,092		27,660		(2,333		)	670,419		670,419
State and municipal:
Special revenue	2,510,816		102,909		(3,737		)	2,609,988		2,609,988
State general obligation	583,456		28,068		(2,070		)	609,454		609,454
Pre-refunded	439,772		32,056		(31		)	471,797		471,797
Corporate backed	388,904		14,039		(402		)	402,541		402,541
Local general obligation	342,158		24,270		(29		)	366,399		366,399
Total state and municipal	4,265,106		201,342		(6,269		)	4,460,179		4,460,179
Mortgage-backed securities:
Residential (1)	1,126,382		18,935		(11,180		)	1,134,137		1,134,137
Commercial	64,975		875		(128		)	65,722		65,722
Total mortgage-backed securities	1,191,357		19,810		(11,308		)	1,199,859		1,199,859
Asset-backed securities	1,706,694		12,892		(14,414		)	1,705,172		1,705,172
Corporate:
Industrial	1,976,393		75,168		(30,027		)	2,021,534		2,021,534
Financial	1,153,096		31,744		(11,819		)	1,173,021		1,173,021
Utilities	192,857		8,321		(2,527		)	198,651		198,651
Other	81,607		245		(20		)	81,832		81,832
Total corporate	3,403,953		115,478		(44,393		)	3,475,038		3,475,038
Foreign	799,839		50,310		(12,689		)	837,460		837,460
Total available for sale	12,012,041		427,492		(91,406		)	12,348,127		12,348,127
Total investments in fixed maturity securities	$	12,108,308	$	445,945	$	(91,406	)	$	12,462,847	$	12,444,394

(In thousands)	Amortized Cost		Gross Unrealized					Fair Value		Carrying Value
			Gains		Losses
December 31, 2014
Held to maturity:
State and municipal	$	72,901	$	17,501	$	—		$	90,402	$	72,901
Residential mortgage-backed	23,278		2,854		—			26,132		23,278
Corporate	4,998		291		—			5,289		4,998
Total held to maturity	101,177		20,646		—			121,823		101,177
Available for sale:
U.S. government and government agency	773,192		33,353		(3,157		)	803,388		803,388
State and municipal:
Special revenue	2,264,210		111,841		(2,084		)	2,373,967		2,373,967
State general obligation	674,022		37,615		(787		)	710,850		710,850
Pre-refunded	504,778		35,619		(289		)	540,108		540,108
Corporate backed	413,234		18,976		(855		)	431,355		431,355
Local general obligation	281,622		25,099		(5		)	306,716		306,716
Total state and municipal	4,137,866		229,150		(4,020		)	4,362,996		4,362,996
Mortgage-backed securities:
Residential (1)	1,201,924		27,124		(9,449		)	1,219,599		1,219,599
Commercial	74,479		1,610		(52		)	76,037		76,037
Total mortgage-backed securities	1,276,403		28,734		(9,501		)	1,295,636		1,295,636
Asset-backed securities	2,019,032		18,868		(11,974		)	2,025,926		2,025,926
Corporate:
Industrial	1,606,724		117,206		(5,131		)	1,718,799		1,718,799
Financial	1,140,801		38,080		(7,673		)	1,171,208		1,171,208
Utilities	184,107		12,436		(1		)	196,542		196,542
Other	86,294		1,370		(2		)	87,662		87,662
Total corporate	3,017,926		169,092		(12,807		)	3,174,211		3,174,211
Foreign	897,668		62,223		(18,065		)	941,826		941,826
Total available for sale	12,122,087		541,420		(59,524		)	12,603,983		12,603,983
Total investments in fixed maturity securities	$	12,223,264	$	562,066	$	(59,524	)	$	12,725,806	$	12,705,160

(1) Gross unrealized losses for mortgage-backed securities include $1,269,491 and $1,095,671, as of December 31, 2015 and 2014, 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, 2015, 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	$	711,642	$	717,075
Due after one year through five years	4,056,450		4,185,436
Due after five years through ten years	3,653,308		3,795,614
Due after ten years	2,476,413		2,543,518
Mortgage-backed securities	1,210,495		1,221,204
Total	$	12,108,308	$	12,462,847

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Investments In Equity Securities Available For Sale (Tables)

12 Months Ended

Dec. 31, 2015

Equity securities available for sale

Schedule of Available-for-sale Securities [Line Items]

Schedule of Investments in Equity Securities

At December 31, 2015 and 2014, investments in equity securities available for sale were as follows:

(In thousands)	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Carrying Value
December 31, 2015
Common stocks	$	56,462	$	—	$	(19,189	)	$	37,273	$	37,273
Preferred stocks	108,730		8,216		(3,353		)	113,593		113,593
Total	$	165,192	$	8,216	$	(22,542	)	$	150,866	$	150,866
December 31, 2014
Common stocks	$	69,870	$	11,929	$	(5,453	)	$	76,346	$	76,346
Preferred stocks	90,425		8,385		(4,165		)	94,645		94,645
Total	$	160,295	$	20,314	$	(9,618	)	$	170,991	$	170,991

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Net Investment Income (Tables)

12 Months Ended

Dec. 31, 2015

Net Investment Income [Abstract]

Net Investment Income

Net investment income consists of the following:

(In thousands)	2015			2014			2013
Investment income earned on:
Fixed maturity securities, including cash and cash equivalents and loans receivable	$	428,325		$	439,489		$	442,287
Equity securities available for sale	4,624			6,726			11,380
Investment funds	62,228			131,649			67,712
Arbitrage trading account	16,891			22,438			20,431
Real estate	11,294			10,228			12,498
Gross investment income	523,362			610,530			554,308
Investment expense	(10,717		)	(9,645		)	(10,017		)
Net investment income	$	512,645		$	600,885		$	544,291

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Investment Funds (Tables)

12 Months Ended

Dec. 31, 2015

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)	2015		2014		2015			2014		2013
Real estate	$	580,830	$	466,703	$	58,032		$	26,233	$	9,315
Energy	93,719		152,056		(37,373		)	12,797		29,739
Hedged equity	70,580		282,335		(2,762		)	10,760		7,655
Other funds	424,911		310,307		44,331			81,859		21,003
Total	$	1,170,040	$	1,211,401	$	62,228		$	131,649	$	67,712

Other funds include private equity investments carried on the equity method of accounting, which includes a publicly traded common stock investment in HealthEquity, Inc. (HQY). Our ownership interest in HQY as of December 31, 2015 is approximately 21% with a fair value of $300.1 million and a carrying value of $45.4 million.

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Real Estate (Tables)

12 Months Ended

Dec. 31, 2015

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)	2015		2014
Properties in operation	$	226,055	$	196,980
Properties under development	710,312		534,632
Total	$	936,367	$	731,612

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Loans Receivable (Tables)

12 Months Ended

Dec. 31, 2015

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)	2015			2014
Amortized cost:
Real estate loans	$	200,499		$	243,407
Commercial loans	72,604			78,605
Total	$	273,103		$	322,012
Fair value:
Real estate loans	$	201,641		$	245,112
Commercial loans	74,106			80,107
Total	$	275,747		$	325,219
Valuation allowance:
Specific	$	—		$	115
General	2,094			2,371
Total	$	2,094		$	2,486
	For the Year Ended December 31,
	2015			2014
(Decrease) increase in valuation allowance	$	(392	)	$	398

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Realized And Unrealized Investment Gains and Losses (Tables)

12 Months Ended

Dec. 31, 2015

Realized and Unrealized Investment Gains (Losses) [Abstract]

Realized and Unrealized Investment Gains (Losses)

Realized and unrealized investment gains and losses are as follows:

(In thousands)	2015			2014			2013
Realized investment gains and losses:
Fixed maturity securities:
Gains	$	23,755		$	39,113		$	48,860
Losses	(4,065		)	(4,420		)	(14,670		)
Equity securities available for sale	9,639			38,296			70,235
Investment funds	93,529			96,204			10,976
Real estate	—			85,659			—
Other gains	2,775			—			12,185
Net realized gains on investments sales	125,633			254,852			127,586
Net other-than-temporary impairments:
Other-than-temporary impairments	(33,309		)	—			(6,042		)
Net other-than-temporary impairments	(33,309		)	—			(6,042		)
Total net investment gains	92,324			254,852			121,544
Income tax expense	(32,313		)	(89,198		)	(47,426		)
After-tax realized investment gain and losses	$	60,011		$	165,654		$	74,118

Change In Unrealized Gains (Losses)

Change in unrealized gains and losses of available for sales securities:
Fixed maturity securities	$	(144,445	)	$	155,765		$	(401,812	)
Previously impaired fixed maturity securities	(174		)	865			1,076
Equity securities available for sale	(27,809		)	(69,016		)	11,864
Investment funds	(19,758		)	(14,725		)	(10,250		)
Total change in unrealized gains	(192,186		)	72,889			(399,122		)
Income tax benefit (expense)	66,644			(23,223		)	138,058
Noncontrolling interests	38			(33		)	(28		)
After-tax change in unrealized investment gain and losses of available for sale securities	$	(125,504	)	$	49,633		$	(261,092	)

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Securities In An Unrealized Loss Position (Tables)

12 Months Ended

Dec. 31, 2015

Investments, Debt and Equity Securities [Abstract]

Securities In An Unrealized Loss Position

The following table summarizes all securities in an unrealized loss position at December 31, 2015 and 2014 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, 2015
U.S. government and government agency	$	101,660	$	487	$	64,500	$	1,846	$	166,160	$	2,333
State and municipal	501,952		4,404		106,681		1,865		608,633		6,269
Mortgage-backed securities	381,986		3,639		184,807		7,669		566,793		11,308
Asset-backed securities	1,091,078		7,703		190,467		6,711		1,281,545		14,414
Corporate	1,232,940		35,406		76,797		8,987		1,309,737		44,393
Foreign government	169,190		8,822		19,528		3,867		188,718		12,689
Fixed maturity securities	3,478,806		60,461		642,780		30,945		4,121,586		91,406
Common stocks	18,641		18,005		7,829		1,184		26,470		19,189
Preferred stocks	—		—		22,320		3,353		22,320		3,353
Equity securities available for sale	18,641		18,005		30,149		4,537		48,790		22,542
Total	$	3,497,447	$	78,466	$	672,929	$	35,482	$	4,170,376	$	113,948
December 31, 2014
U.S. government and government agency	$	84,750	$	522	$	84,850	$	2,635	$	169,600	$	3,157
State and municipal	158,594		631		150,284		3,389		308,878		4,020
Mortgage-backed securities	75,739		332		312,922		9,169		388,661		9,501
Asset-backed securities	1,186,097		6,217		30,818		5,757		1,216,915		11,974
Corporate	400,141		2,480		183,810		10,327		583,951		12,807
Foreign government	76,471		3,907		85,025		14,158		161,496		18,065
Fixed maturity securities	1,981,792		14,089		847,709		45,435		2,829,501		59,524
Common stocks	15,929		5,453		—		—		15,929		5,453
Preferred stocks	27,126		1,139		22,648		3,026		49,774		4,165
Equity securities available for sale	43,055		6,592		22,648		3,026		65,703		9,618
Total	$	2,024,847	$	20,681	$	870,357	$	48,461	$	2,895,204	$	69,142

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, 2015 is presented in the table below:

(Dollars in thousands)	Number of Securities	Aggregate Fair Value		Gross Unrealized Loss
Mortgage-backed securities	8	$	23,370	$	1,790
Asset-backed securities	7	19,535		264
Corporate	12	128,716		6,717
Foreign government	1	13,956		3,766
Total	28	$	185,577	$	12,537

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Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2015

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 on a recurring basis as of December 31, 2015 and 2014 by level:

(In thousands)	Total		Level 1		Level 2		Level 3
December 31, 2015
Assets:
Fixed maturity securities available for sale:
U.S. government and government agency	$	670,419	$	—	$	670,419	$	—
State and municipal	4,460,179		—		4,460,179		—
Mortgage-backed securities	1,199,859		—		1,199,859		—
Asset-backed securities	1,705,172		—		1,704,973		199
Corporate	3,475,038		—		3,474,884		154
Foreign government	837,460		—		837,460		—
Total fixed maturity securities available for sale	12,348,127		—		12,347,774		353
Equity securities available for sale:
Common stocks	37,273		29,444		—		7,829
Preferred stocks	113,593		—		109,969		3,624
Total equity securities available for sale	150,866		29,444		109,969		11,453
Arbitrage trading account	376,697		256,914		119,607		176
Total	$	12,875,690	$	286,358	$	12,577,350	$	11,982
Liabilities:
Trading account securities sold but not yet purchased	$	37,035	$	35,559	$	1,476	$	—
December 31, 2014
Assets:
Fixed maturity securities available for sale:
U.S. government and government agency	$	803,388	$	—	$	803,388	$	—
State and municipal	4,362,996		—		4,362,996		—
Mortgage-backed securities	1,295,636		—		1,295,636		—
Asset-backed securities	2,025,926		—		2,005,315		20,611
Corporate	3,174,211		—		3,174,057		154
Foreign government	941,826		—		941,826		—
Total fixed maturity securities available for sale	12,603,983		—		12,583,218		20,765
Equity securities available for sale:
Common stocks	76,346		65,605		—		10,741
Preferred stocks	94,645		—		90,932		3,713
Total equity securities available for sale	170,991		65,605		90,932		14,454
Arbitrage trading account	450,648		295,047		154,881		720
Total	$	13,225,622	$	360,652	$	12,829,031	$	35,939
Liabilities:
Trading account securities sold but not yet purchased	$	106,079	$	106,074	$	5	$	—

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, 2015 and 2014:

	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, 2015
Assets:
Fixed maturity securities available for sale:
Asset-backed securities	$	20,611	$	19		$	191		$	—		$	—	$	—		$	(1,820	)	$	(18,802	)	$	199
Corporate	154		—			—			—			—		—			—			—			154
Total	20,765		19			191			—			—		—			(1,820		)	(18,802		)	353
Equity securities available for sale:
Common stocks	10,741		—			(273		)	(2,331		)	—		(308		)	—			—			7,829
Preferred stocks	3,713		(89		)	—			—			—		—			—			—			3,624
Total	14,454		(89		)	(273		)	(2,331		)	—		(308		)	—			—			11,453
Arbitrage trading account	720		(799		)	—			—			72,640		(71,921		)	—			(464		)	176
Total	$	35,939	$	(869	)	$	(82	)	$	(2,331	)	$	72,640	$	(72,229	)	$	(1,820	)	$	(19,266	)	$	11,982
Liabilities:
Trading account securities sold but not yet purchased	$	—	$	—		$	—		$	—		$	—	$	—		$	—		$	—		$	—
Year ended December 31, 2014
Assets:
Fixed maturity securities available for sale:
Asset-backed securities	$	42,710	$	47		$	(3,711	)	$	—		$	238	$	(15,244	)	$	(3,429	)	$	—		$	20,611
Corporate	$	154	$	—		$	—		$	—		$	—	$	—		$	—		$	—		$	154
Total	42,864		47			(3,711		)	—			238		(15,244		)	(3,429		)	—			20,765
Equity securities available for sale:
Common stocks	1,238		—			(911		)	—			11,343		(929		)	—			—			10,741
Preferred stocks	3,752		(17		)	—			—			3,430		(3,452		)	—			—			3,713
Total	4,990		(17		)	(911		)	—			14,773		(4,381		)	—			—			14,454
Arbitrage trading account	1,780		2,274			—			—			4,942		(14,073		)	—			5,797			720
Total	$	49,634	$	2,304		$	(4,622	)	$	—		$	19,953	$	(33,698	)	$	(3,429	)	$	5,797		$	35,939
Liabilities:
Trading account securities sold but not yet purchased	$	—	$	(20	)	$	—		$	—		$	31	$	(11	)	$	—		$	—		$	—

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Reserves For Losses And Loss Expenses (Tables)

12 Months Ended

Dec. 31, 2014

Insurance [Abstract]

Schedule of Liability for Unpaid Claims and Claims Adjustment Expense

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

(In thousands)	2015			2014			2013
Net reserves at beginning of year	$	8,970,641		$	8,683,797		$	8,411,851
Net provision for losses and loss expenses:
Claims occuring during the current year(1)	3,653,561			3,495,825			3,221,393
Decrease in estimates for claims occurring in prior years(2)(3)	(46,713		)	(75,764		)	(78,810		)
Loss reserve discount accretion(4)	49,422			70,506			54,441
Total	3,656,270			3,490,567			3,197,024
Net payments for claims:
Current year	914,637			898,944			822,787
Prior year	2,342,378			2,216,283			2,055,284
Total	3,257,015			3,115,227			2,878,071
Foreign currency translation	(125,024		)	(88,496		)	(47,007		)
Net reserves at end of year	9,244,872			8,970,641			8,683,797
Ceded reserve at end of year	1,424,278			1,399,060			1,397,144
Gross reserves at end of year	$	10,669,150		$	10,369,701		$	10,080,941

_______________________________________

(1) Claims occurring during the current year are net of loss reserve discounts of $20,357,000, $21,306,000, and $22,680,000 in 2015, 2014 and 2013, respectively.

(2) The 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 $64,971,000, $116,866,000 and $77,430,000 in 2015, 2014 and 2013, respectively.

(3) For certain retrospectively rated insurance polices and reinsurance agreements, reserve development is offset by additional or return premiums. Favorable reserve development, net of additional and return premiums, was $63 million, $85 million and $98 million in 2015, 2014 and 2013, respectively.

(4) In 2014, the Company entered into a commutation agreement that resulted in a reduction in prior year workers' compensation reserves of $30 million on an undiscounted basis and $12 million on a discounted basis.

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Reinsurance (Tables)

12 Months Ended

Dec. 31, 2015

Reinsurance Disclosures [Abstract]

Reinsurance Financial Information

The following is a summary of reinsurance financial information:

(In thousands)	2015			2014			2013
Written premiums:
Direct	$	6,412,533		$	6,185,242		$	5,626,172
Assumed	837,460			877,596			884,919
Ceded	(1,060,478		)	(1,065,891		)	(1,010,918		)
Total net written premiums	$	6,189,515		$	5,996,947		$	5,500,173
Earned premiums:
Direct	$	6,245,714		$	5,889,021		$	5,328,955
Assumed	845,735			886,063			857,119
Ceded	(1,050,840		)	(1,030,666		)	(959,537		)
Total net earned premiums	$	6,040,609		$	5,744,418		$	5,226,537
Ceded losses and loss expenses incurred	$	501,999		$	475,802		$	556,108
Ceded commission earned	$	129,766		$	160,215		$	137,449

Schedule of Ceded Credit Risk by Reinsurer

The following table presents the amounts due from reinsurers as of December 31, 2015:

(In thousands)
Allegany Group	$	138,163
Munich Re	121,661
Swiss Re	115,215
Lloyd’s of London	92,635
Axis Capital	69,840
Partner Re	65,793
Hannover Re Group	48,675
Everest Re	47,945
Berkshire Hathaway	47,309
Chubb Limited (1)	45,645
Arch Capital Group	23,273
Other reinsurers less than $20,000	213,169
Subtotal	1,029,323
Residual market pools	503,506
Total	$	1,532,829

(1) Includes the aggregate recoverables from Ace Group and Chubb Group.

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Indebtedness (Tables)

12 Months Ended

Dec. 31, 2014

Senior Notes and Other Debt

Debt Instrument [Line Items]

Schedule of Debt

Indebtedness consisted of the following as of December 31, 2015 (the difference between the face value and the carrying value is unamortized discount):

(In thousands)	Interest Rate	Face Value		2015 Carrying Value		2014 Carrying Value
Senior notes due on:
May 15, 2015	5.6%	$	—	$	—	$	199,930
August 15, 2019	6.15%	150,000		149,484		149,342
September 15, 2019	7.375%	300,000		299,054		298,800
September 15, 2020	5.375%	300,000		298,411		298,074
January 1, 2022	8.7%	76,503		76,097		76,048
March 15, 2022	4.625%	350,000		347,417		346,999
February 15, 2037	6.25%	250,000		247,676		247,566
August 1, 2044	4.75%	350,000		344,730		344,545
Subsidiary debt (1)	Various	81,752		81,752		154,223
Total senior notes and other debt		$	1,858,255	$	1,844,621	$	2,115,527
Subordinated debentures, due on April, 30, 2053	5.625%	$	350,000	$	340,320	$	340,060

_____________

(1) Subsidiary debt is due as follows: $43 million in 2016, $37 million in 2017 and $2 million thereafter.

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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2015

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expense (Benefit)

Income tax expense consists of:

(In thousands)	Current Expense			Deferred Expense		Total
December 31, 2015
Domestic	$	179,150		$	31,145	$	210,295
Foreign	(2,318		)	19,946		17,628
Total expense	$	176,832		$	51,091	$	227,923
December 31, 2014
Domestic	$	258,337		$	28,029	$	286,366
Foreign	12,969			3,258		16,227
Total expense	$	271,306		$	31,287	$	302,593
December 31, 2013
Domestic	$	116,802		$	47,370	$	164,172
Foreign	22,362			7,053		29,415
Total expense	$	139,164		$	54,423	$	193,587

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 35% to pre-tax income are as follows:

(In thousands)	2015			2014			2013
Computed “expected” tax expense	$	256,210		$	333,269		$	244,611
Tax-exempt investment income	(39,283		)	(38,757		)	(40,679		)
Change in valuation allowance	2,702			1,335			—
Impact of foreign tax rates	4,447			6,239			(4,851		)
State and local taxes	940			2,375			2,906
Other, net	2,907			(1,868		)	(8,400		)
Total expense	$	227,923		$	302,593		$	193,587

Schedule of Deferred Tax Assets and Liabilities

(In thousands)	2015			2014			2013
Computed “expected” tax expense	$	256,210		$	333,269		$	244,611
Tax-exempt investment income	(39,283		)	(38,757		)	(40,679		)
Change in valuation allowance	2,702			1,335			—
Impact of foreign tax rates	4,447			6,239			(4,851		)
State and local taxes	940			2,375			2,906
Other, net	2,907			(1,868		)	(8,400		)
Total expense	$	227,923		$	302,593		$	193,587

At December 31, 2015 and 2014, 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)	2015			2014
Deferred tax asset:
Loss reserve discounting	$	100,806		$	77,216
Unearned premiums	176,465			165,075
Other-than-temporary impairments	26,509			45,367
Restricted stock units	62,442			60,061
Other	89,761			101,131
Gross deferred tax asset	455,983			448,850
Less valuation allowance	(4,037		)	(1,335		)
Deferred tax asset	451,946			447,515
Deferred tax liability:
Amortization of intangibles	20,316			22,747
Deferred policy acquisition costs	162,344			152,001
Unrealized investment gains	115,499			175,111
Other	160,598			135,108
Deferred tax liability	458,757			484,967
Net deferred tax asset (liability)	$	(6,811	)	$	(37,452	)

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Dividends From Subsidiaries And Statutory Financial Information (Tables)

12 Months Ended

Dec. 31, 2015

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)	2015		2014		2013
Net income	$	813,303	$	757,010	$	468,850
Statutory capital and surplus	$	5,296,435	$	5,438,063	$	4,908,010

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Common Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2015

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:

	2015	2014	2013
Basic	124,040,313	127,873,708	135,304,752
Diluted	130,188,866	133,651,855	140,742,922

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 and unexercised stock options.

	2015		2014		2013
Balance, beginning of year	126,748,836		132,233,167		136,017,732
Shares issued	1,061,026		332,137		139,790
Shares repurchased	(4,502,025	)	(5,816,468	)	(3,924,355)
Balance, end of year	123,307,837		126,748,836		132,233,167

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Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2015

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, 2015 and 2014:

	2015				2014
(In thousands)	Carrying Value		Fair Value		Carrying Value		Fair Value
Assets:
Fixed maturity securities	$	12,444,394	$	12,462,847	$	12,705,160	$	12,725,806
Equity securities available for sale	150,866		150,866		170,991		170,991
Arbitrage trading account	376,697		376,697		450,648		450,648
Loans receivable	273,103		275,747		322,012		325,219
Cash and cash equivalents	763,631		763,631		674,441		674,441
Trading accounts receivable from brokers and clearing organizations	383,115		383,115		371,034		371,034
Due from broker	1,713		1,713		—		—
Liabilities:
Due to broker	—		—		23,133		23,133
Trading account securities sold but not yet purchased	37,035		37,035		106,079		106,079
Subordinated debentures	340,320		355,880		340,060		332,640
Senior notes and other debt	1,844,621		2,029,572		2,115,527		2,344,292

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Stock Incentive Plan (Tables)

12 Months Ended

Dec. 31, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Share-based Compensation, Stock Options, Activity

Schedule of Nonvested Restricted Stock Units Activity

The following table summarizes RSU information for the three years ended December 31, 2015:

	2015		2014		2013
RSUs granted and unvested at beginning of period:	5,330,445		4,491,520		4,701,120
Granted	997,522		1,154,950		108,400
Vested	(1,938,000	)	(81,500	)	(146,250	)
Canceled	(231,642	)	(234,525	)	(171,750	)
RSUs granted and unvested at end of period:	4,158,325		5,330,445		4,491,520

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, 2015:

(In thousands)	2015			2014			2013
Unearned compensation at beginning of year	$	88,015		$	73,205		$	93,653
RSUs granted, net of cancellations	50,442			51,575			4,406
RSUs expensed	(30,691		)	(27,966		)	(22,881		)
RSUs forfeitures	(4,228		)	(8,799		)	(1,973		)
Unearned compensation at end of year	$	103,538		$	88,015		$	73,205

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Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2015

Compensation Related Costs [Abstract]

Long-Term Incentive Compensation Plan Expense

The following table summarizes the LTIP expense for each of the three years ended December 31, 2015:

(In thousands)	2015		2014		2013
2011 grant	$	7,397	$	9,855	$	6,939
2013 grant	7,336		9,493		7,231
2014 grant	2,935		3,663		—
2015 grant	3,205		—		—
Total	$	20,873	$	23,011	$	14,170

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Supplemental Financial Statement Information (Tables)

12 Months Ended

Dec. 31, 2015

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)	2015		2014			2013
Amortization of deferred policy acquisition costs	$	1,102,492	$	1,053,397		$	991,070
Other underwriting expenses	903,006		843,133			780,058
Service company expenses	127,365		102,726			88,662
Net foreign currency losses (gains)	400		(27		)	(10,120		)
Other costs and expenses	156,487		158,227			151,014
Total	$	2,289,750	$	2,157,456		$	2,000,684

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Industry Segments (Tables)

12 Months Ended

Dec. 31, 2015

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 (loss) 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		Pre-Tax Income (Loss)			Net Income (Loss)
December 31, 2015:
Insurance-Domestic	$	4,659,359	$	358,935	$	96,487	$	5,114,781	$	724,667		$	495,082
Insurance-International	772,141		51,522		—		823,663		51,926			37,204
Reinsurance-Global	609,109		74,226		—		683,335		94,852			66,627
Corporate, other and eliminations(1)	—		27,962		464,392		492,354		(231,739		)	(155,230		)
Net investment gains	—		—		92,324		92,324		92,324			60,011
Consolidated	$	6,040,609	$	512,645	$	653,203	$	7,206,457	$	732,030		$	503,694
December 31, 2014:
Insurance-Domestic	$	4,271,933	$	428,632	$	106,853	$	4,807,418	$	796,309		$	539,461
Insurance-International	802,375		55,407		—		857,782		29,779			22,182
Reinsurance-Global	670,110		88,821		—		758,931		115,677			79,720
Corporate, other and eliminations(1)	—		28,025		421,920		449,945		(244,421		)	(158,133		)
Net investment gains	—		—		254,852		254,852		254,852			165,654
Consolidated	$	5,744,418	$	600,885	$	783,625	$	7,128,928	$	952,196		$	648,884
December 31, 2013:
Insurance-Domestic	$	3,782,416	$	404,280	$	107,517	$	4,294,213	$	648,740		$	449,981
Insurance-International	723,151		47,039		—		770,190		56,922			40,292
Reinsurance-Global	720,970		89,090		—		810,060		110,425			78,013
Corporate, other and eliminations(1)	—		3,882		408,645		412,527		(238,743		)	(142,479		)
Net investment gains	—		—		121,544		121,544		121,544			74,118
Consolidated	$	5,226,537	$	544,291	$	637,706	$	6,408,534	$	698,888		$	499,925

Identifiable Assets by Segments

Identifiable Assets
(In thousands)	December 31, 2015		December 31, 2014
Insurance-Domestic	$	16,351,737	$	16,065,409
Insurance-International	1,711,993		1,879,438
Reinsurance-Global	2,441,340		2,713,554
Corporate, other and eliminations(1)	1,225,897		1,058,290
Consolidated	$	21,730,967	$	21,716,691

_______________________________________

(1) 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)	2015		2014		2013
Insurance-Domestic
Other liability	$	1,546,157	$	1,449,425	$	1,259,376
Workers' compensation	1,269,785		1,126,704		995,047
Short-tail lines	925,468		875,898		774,809
Commercial automobile	548,450		526,344		486,759
Professional liability	369,499		293,562		266,425
Total Insurance-Domestic	4,659,359		4,271,933		3,782,416
Insurance-International
Other liability	103,974		92,411		65,528
Workers' compensation	93,728		71,997		84,637
Short-tail lines	373,415		415,123		336,814
Commercial automobile	125,628		116,369		130,020
Professional liability	75,396		106,475		106,152
Total Insurance-International	772,141		802,375		723,151
Reinsurance-Global
Casualty	421,811		487,264		507,790
Property	187,298		182,846		213,180
Total Reinsurance-Global	609,109		670,110		720,970
Total	$	6,040,609	$	5,744,418	$	5,226,537

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Quarterly Financial Information (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2015

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)	2015
Three months ended	March 31		June 30		September 30		December 31
Revenues	$	1,744,679	$	1,789,765	$	1,860,957	$	1,811,056
Net income	118,307		123,035		152,607		109,745
Net income per share(1)
Basic	0.94		0.99		1.24		0.89
Diluted	0.89		0.95		1.18		0.85

	2014
Three months ended	March 31		June 30		September 30		December 31
Revenues	$	1,706,906	$	1,796,989	$	1,840,605	$	1,784,428
Net income	169,673		179,961		188,539		110,711
Net income per share(1)
Basic	1.31		1.41		1.48		0.87
Diluted	1.25		1.35		1.42		0.83

_______________________________________

(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.

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Summary of Significant Accounting Policies (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounting Policies [Abstract]
Unbilled Audit Premiums	$ 3,000,000	$ 9,000,000	$ 12,000,000
Deposit contracts, liabilities	54,000,000	68,000,000
Depreciation	45,000,000	44,000,000	38,000,000
Goodwill and intangible asset impairment	0
Indefinite-lived Intangible Assets [Line Items]
Interest payments	130,000,000	120,000,000	125,000,000
Income taxes paid	165,000,000	314,000,000	$ 186,000,000
Other Assets
Indefinite-lived Intangible Assets [Line Items]
Intangible assets, net (excluding goodwill)	$ 94,000,000	$ 96,000,000

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Summary of Significant Accounting Policies (Recent accounting change) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other operating costs and expenses													$ 2,289,750	$ 2,157,456	$ 2,000,684
Income before income taxes													732,030	952,196	698,888
Federal and foreign income taxes													(227,923)	(302,593)	(193,587)
Net income	$ 109,745	$ 152,607	$ 123,035	$ 118,307	$ 110,711		$ 188,539		$ 179,961		$ 169,673		$ 503,694	$ 648,884	$ 499,925
Basic net income per share (dollars per share)	$ 0.89	$ 1.24	$ 0.99	$ 0.94	$ 0.87	[1]	$ 1.48	[1]	$ 1.41	[1]	$ 1.31	[1]	$ 4.06	$ 5.07	$ 3.69
Diluted net income per share (dollars per share)	$ 0.85	$ 1.18	$ 0.95	$ 0.89	$ 0.83	[1]	$ 1.42	[1]	$ 1.35	[1]	$ 1.25	[1]	$ 3.87	$ 4.86	$ 3.55

[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.

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Acquisitions (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Accumulated other comprehensive income (loss)		$ (66,698)	$ 183,550
Business acquisition, cost of acquired entity, cash paid		8,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Premium and service fee receivable		153,291	150,944
Deferred federal and foreign income taxes		6,811	37,452
Proceeds from Sales of Business, Affiliate and Productive Assets			16,000
Assets of Disposal Group, Including Discontinued Operation			15,000
Disposal Group, Including Discontinued Operation, Property, Plant, and Equipment, Net			4,000
Disposal Group, Including Discontinued Operation, Goodwill			7,000
Disposal Group, Including Discontinued Operation, Other Assets			6,000
Disposal Group, Including Discontinued Operation, Liabilities of Disposal Group			2,000
Other Comprehensive Income (Loss), Net of Tax		(250,286)	(5,808)	$ (276,212)
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest		732,030	952,196	698,888
Other Cost and Expense, Operating		2,289,750	2,157,456	2,000,684
Income Tax expense		(227,923)	(302,593)	(193,587)
Net income (loss)		504,107	649,603	505,301
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax		(192,186)	72,889
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax		(124,744)	(62,125)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax		0	10,232
Other Comprehensive Income (Loss), before Tax		(316,930)	20,996
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax		66,644	(23,223)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax		0	0
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax		0	(3,581)
Other Comprehensive Income (Loss), Tax		66,644	(26,804)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax		(125,542)	49,666
Net change in period		(124,744)	(62,125)	(23,848)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax		$ 0	6,651
London Acquisition, Inactive insurance Company, and Worldwide Supplier of After-market (OEM) Parts [Member]
Business Acquisition [Line Items]
Indefinite-lived Intangible Assets Acquired			10,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Cash and cash equivalents			17,457
Real estate, furniture and equipment			669
Goodwill and other intangibles assets			79,646
Premium and service fee receivable			24,432
Other assets			2,590
Total assets acquired			124,794
Deferred federal and foreign income taxes			(7,107)
Debt			0
Other liabilities assumed			(34,809)
Net assets acquired			(82,878)
Minimum | Worldwide Supplier of After-market (OEM) Parts [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		2 years
Maximum | Worldwide Supplier of After-market (OEM) Parts [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		15 years
Unrealized investment gains (losses)
Business Acquisition [Line Items]
Accumulated other comprehensive income (loss)		$ 180,695	306,199	256,566
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Other comprehensive income (loss) before reclassifications		(119,994)	98,294
Amounts reclassified from AOCI		(5,548)	(48,628)
Other Comprehensive Income (Loss), Net of Tax		(125,542)	49,666
Unrealized investment gain related to non-controlling interest		38	(33)
Currency translation adjustments
Business Acquisition [Line Items]
Accumulated other comprehensive income (loss)		(247,393)	(122,649)	(60,524)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Other comprehensive income (loss) before reclassifications		(124,744)	(62,125)
Amounts reclassified from AOCI		0	0
Other Comprehensive Income (Loss), Net of Tax		(124,744)	(62,125)
Unrealized investment gain related to non-controlling interest		0	0
Net change in period		(124,744)	(62,125)	(23,848)
Net pension asset
Business Acquisition [Line Items]
Accumulated other comprehensive income (loss)		0	0	(6,651)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Other comprehensive income (loss) before reclassifications		0	0
Amounts reclassified from AOCI		0	6,651
Other Comprehensive Income (Loss), Net of Tax		0	6,651
Unrealized investment gain related to non-controlling interest		0	0
Accumulated other comprehensive income (loss)
Business Acquisition [Line Items]
Accumulated other comprehensive income (loss)		(66,698)	183,550	$ 189,391
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Other comprehensive income (loss) before reclassifications		(244,738)	36,169
Amounts reclassified from AOCI		(5,548)	(41,977)
Other Comprehensive Income (Loss), Net of Tax		(250,286)	(5,808)
Unrealized investment gain related to non-controlling interest		38	(33)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized investment gains (losses)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Marketable Securities, Realized Gain (Loss), Excluding Other than Temporary Impairments	[1]	(8,535)	(74,812)
Income Tax expense	[2]	2,987	26,184
Net income (loss)		(5,548)	(48,628)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Currency translation adjustments
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest		0	0
Income Tax expense		0	0
Net income (loss)		0	0
Reclassification out of Accumulated Other Comprehensive Income [Member] | Net pension asset
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Other Cost and Expense, Operating	[3]	0	10,232
Income Tax expense	[2]	0	(3,581)
Net income (loss)		0	6,651
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated other comprehensive income (loss)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest		(8,535)	(64,580)
Income Tax expense		2,987	22,603
Net income (loss)		$ (5,548)	$ (41,977)

[1] Net investment gains in the consolidated statements of income.

[2] Income tax expense in the consolidated statements of income.

[3] Other operating costs and expenses in the consolidated statements of income.

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Consolidated Statement of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning of period		$ 183,550
Other comprehensive loss		(250,286)	$ (5,808)	$ (276,212)
Ending balance		(66,698)	183,550
Income before income taxes		732,030	952,196	698,888
Other operating costs and expenses		2,289,750	2,157,456	2,000,684
Federal and foreign income taxes		(227,923)	(302,593)	(193,587)
Net income before noncontrolling interests		504,107	649,603	505,301
Unrealized investment gains, before tax		(192,186)	72,889
Currency translation adjustments, before tax		(124,744)	(62,125)
Net pension asset, before tax		0	10,232
Other comprehensive income (loss), before tax		(316,930)	20,996
Unrealized investment gains, tax		66,644	(23,223)
Currency translation adjustments, tax		0	0
Net pension asset, tax		0	(3,581)
Other comprehensive income (loss), tax		66,644	(26,804)
Unrealized investment gains, net of tax		(125,542)	49,666
Change in unrealized translation adjustments		(124,744)	(62,125)	(23,848)
Net pension asset, net of tax		0	6,651
Unrealized investment gains (losses)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning of period		306,199	256,566
Other comprehensive income (loss) before reclassifications		(119,994)	98,294
Amounts reclassified from AOCI		(5,548)	(48,628)
Other comprehensive loss		(125,542)	49,666
Unrealized investment gain related to non-controlling interest		38	(33)
Ending balance		180,695	306,199	256,566
Unrealized investment gains (losses) | Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net investment gains	[1]	(8,535)	(74,812)
Federal and foreign income taxes	[2]	2,987	26,184
Net income before noncontrolling interests		(5,548)	(48,628)
Currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning of period		(122,649)	(60,524)
Other comprehensive income (loss) before reclassifications		(124,744)	(62,125)
Amounts reclassified from AOCI		0	0
Other comprehensive loss		(124,744)	(62,125)
Unrealized investment gain related to non-controlling interest		0	0
Ending balance		(247,393)	(122,649)	(60,524)
Change in unrealized translation adjustments		(124,744)	(62,125)	(23,848)
Currency translation adjustments | Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income before income taxes		0	0
Federal and foreign income taxes		0	0
Net income before noncontrolling interests		0	0
Net pension asset
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning of period		0	(6,651)
Other comprehensive income (loss) before reclassifications		0	0
Amounts reclassified from AOCI		0	6,651
Other comprehensive loss		0	6,651
Unrealized investment gain related to non-controlling interest		0	0
Ending balance		0	0	(6,651)
Net pension asset | Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other operating costs and expenses	[3]	0	10,232
Federal and foreign income taxes	[2]	0	(3,581)
Net income before noncontrolling interests		0	6,651
Accumulated other comprehensive income (loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning of period		183,550	189,391
Other comprehensive income (loss) before reclassifications		(244,738)	36,169
Amounts reclassified from AOCI		(5,548)	(41,977)
Other comprehensive loss		(250,286)	(5,808)
Unrealized investment gain related to non-controlling interest		38	(33)
Ending balance		(66,698)	183,550	$ 189,391
Accumulated other comprehensive income (loss) | Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income before income taxes		(8,535)	(64,580)
Federal and foreign income taxes		2,987	22,603
Net income before noncontrolling interests		$ (5,548)	$ (41,977)

[1] Net investment gains in the consolidated statements of income.

[2] Income tax expense in the consolidated statements of income.

[3] Other operating costs and expenses in the consolidated statements of income.

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Investments in Fixed Maturity Securities (Investments in Fixed Maturity Securities) (Details) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]
investments with a carrying value held on deposit in custodial or trust accounts	$ 963,000,000
Total held to maturity, Amortized Cost	96,267,000	$ 101,177,000
Total held to maturity, Gross Unrealized Gains	18,453,000	20,646,000
Total held to maturity, Gross Unrealized Losses	0	0
Total held to maturity, Fair Value	114,720,000	121,823,000
Total held to maturity, Carrying Value	96,267,000	101,177,000
Total available for sale, Amortized Cost	12,012,041,000	12,122,087,000
Total available for sale, Gross Unrealized Gains	427,492,000	541,420,000
Total available for sale, Gross Unrealized Losses	(91,406,000)	(59,524,000)
Total available for sale, Fair Value	12,348,127,000	12,603,983,000
Total available for sale, Carrying Value	12,348,127,000	12,603,983,000
Total investment in fixed maturity securities, Amortized Cost	12,108,308,000	12,223,264,000
Total investments in fixed maturity securities, Gross Unrealized Gains	445,945,000	562,066,000
Total investments in fixed maturity securities, Gross Unrealized Losses	(91,406,000)	(59,524,000)
Total investments in fixed maturity securities, Fair Value	12,462,847,000	12,725,806,000
Total investments in fixed maturity securities, carrying value	12,444,394,000	12,705,160,000
Foreign Government Debt Securities [Member]
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]
Total available for sale, Amortized Cost	799,839,000	897,668,000
Total available for sale, Gross Unrealized Gains	50,310,000	62,223,000
Total available for sale, Gross Unrealized Losses	(12,689,000)	(18,065,000)
Total available for sale, Fair Value	837,460,000	941,826,000
Total available for sale, Carrying Value	837,460,000	941,826,000
Commercial Mortgage Backed Securities [Member]
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]
Total available for sale, Amortized Cost	64,975,000	74,479,000
Total available for sale, Gross Unrealized Gains	875,000	1,610,000
Total available for sale, Gross Unrealized Losses	(128,000)	(52,000)
Total available for sale, Fair Value	65,722,000	76,037,000
Total available for sale, Carrying Value	65,722,000	76,037,000
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	645,092,000	773,192,000
Total available for sale, Gross Unrealized Gains	27,660,000	33,353,000
Total available for sale, Gross Unrealized Losses	(2,333,000)	(3,157,000)
Total available for sale, Fair Value	670,419,000	803,388,000
Total available for sale, Carrying Value	670,419,000	803,388,000
Held to maturity:
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]
Total available for sale, Amortized Cost	4,265,106,000	4,137,866,000
Total available for sale, Gross Unrealized Gains	201,342,000	229,150,000
Total available for sale, Gross Unrealized Losses	(6,269,000)	(4,020,000)
Total available for sale, Fair Value	4,460,179,000	4,362,996,000
Total available for sale, Carrying Value	4,460,179,000	4,362,996,000
State and municipal
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	1,269,491	1,095,671
Total available for sale, Amortized Cost	1,126,382,000	1,201,924,000
Total available for sale, Gross Unrealized Gains	18,935,000	27,124,000
Total available for sale, Gross Unrealized Losses	(11,180,000)	(9,449,000)
Total available for sale, Fair Value	1,134,137,000	1,219,599,000
Total available for sale, Carrying Value	1,134,137,000	1,219,599,000
Residential mortgage-backed
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]
Total available for sale, Amortized Cost	3,403,953,000	3,017,926,000
Total available for sale, Gross Unrealized Gains	115,478,000	169,092,000
Total available for sale, Gross Unrealized Losses	(44,393,000)	(12,807,000)
Total available for sale, Fair Value	3,475,038,000	3,174,211,000
Total available for sale, Carrying Value	3,475,038,000	3,174,211,000
Debt Securities
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]
Total available for sale, Amortized Cost	2,510,816,000	2,264,210,000
Total available for sale, Gross Unrealized Gains	102,909,000	111,841,000
Total available for sale, Gross Unrealized Losses	(3,737,000)	(2,084,000)
Total available for sale, Fair Value	2,609,988,000	2,373,967,000
Total available for sale, Carrying Value	2,609,988,000	2,373,967,000
Debt, State Government [Member]
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]
Total available for sale, Amortized Cost	583,456,000	674,022,000
Total available for sale, Gross Unrealized Gains	28,068,000	37,615,000
Total available for sale, Gross Unrealized Losses	(2,070,000)	(787,000)
Total available for sale, Fair Value	609,454,000	710,850,000
Total available for sale, Carrying Value	609,454,000	710,850,000
Revenue Subject to Refund [Member]
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]
Total available for sale, Amortized Cost	439,772,000	504,778,000
Total available for sale, Gross Unrealized Gains	32,056,000	35,619,000
Total available for sale, Gross Unrealized Losses	(31,000)	(289,000)
Total available for sale, Fair Value	471,797,000	540,108,000
Total available for sale, Carrying Value	471,797,000	540,108,000
Corporation [Member]
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]
Total available for sale, Amortized Cost	388,904,000	413,234,000
Total available for sale, Gross Unrealized Gains	14,039,000	18,976,000
Total available for sale, Gross Unrealized Losses	(402,000)	(855,000)
Total available for sale, Fair Value	402,541,000	431,355,000
Total available for sale, Carrying Value	402,541,000	431,355,000
Collateralized Mortgage Backed Securities [Member]
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]
Total available for sale, Amortized Cost	1,191,357,000	1,276,403,000
Total available for sale, Gross Unrealized Gains	19,810,000	28,734,000
Total available for sale, Gross Unrealized Losses	(11,308,000)	(9,501,000)
Total available for sale, Fair Value	1,199,859,000	1,295,636,000
Total available for sale, Carrying Value	1,199,859,000	1,295,636,000
Asset-backed Securities [Member]
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]
Total available for sale, Amortized Cost	1,706,694,000	2,019,032,000
Total available for sale, Gross Unrealized Gains	12,892,000	18,868,000
Total available for sale, Gross Unrealized Losses	(14,414,000)	(11,974,000)
Total available for sale, Fair Value	1,705,172,000	2,025,926,000
Total available for sale, Carrying Value	1,705,172,000	2,025,926,000
Industrial Property [Member]
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]
Total available for sale, Amortized Cost	1,976,393,000	1,606,724,000
Total available for sale, Gross Unrealized Gains	75,168,000	117,206,000
Total available for sale, Gross Unrealized Losses	(30,027,000)	(5,131,000)
Total available for sale, Fair Value	2,021,534,000	1,718,799,000
Total available for sale, Carrying Value	2,021,534,000	1,718,799,000
Domestic Corporate Debt Securities [Member]
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]
Total available for sale, Amortized Cost	1,153,096,000	1,140,801,000
Total available for sale, Gross Unrealized Gains	31,744,000	38,080,000
Total available for sale, Gross Unrealized Losses	(11,819,000)	(7,673,000)
Total available for sale, Fair Value	1,173,021,000	1,171,208,000
Total available for sale, Carrying Value	1,173,021,000	1,171,208,000
Public Utility, Bonds [Member]
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]
Total available for sale, Amortized Cost	192,857,000	184,107,000
Total available for sale, Gross Unrealized Gains	8,321,000	12,436,000
Total available for sale, Gross Unrealized Losses	(2,527,000)	(1,000)
Total available for sale, Fair Value	198,651,000	196,542,000
Total available for sale, Carrying Value	198,651,000	196,542,000
Other Security Investments [Member]
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]
Total available for sale, Amortized Cost	81,607,000	86,294,000
Total available for sale, Gross Unrealized Gains	245,000	1,370,000
Total available for sale, Gross Unrealized Losses	(20,000)	(2,000)
Total available for sale, Fair Value	81,832,000	87,662,000
Total available for sale, Carrying Value	81,832,000	87,662,000
Debt, Local Government [Member]
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]
Total available for sale, Amortized Cost	342,158,000	281,622,000
Total available for sale, Gross Unrealized Gains	24,270,000	25,099,000
Total available for sale, Gross Unrealized Losses	(29,000)	(5,000)
Total available for sale, Fair Value	366,399,000	306,716,000
Total available for sale, Carrying Value	366,399,000	306,716,000
523991 Trust, Fiduciary, and Custody Activities [Member]
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]
investments with a carrying value held on deposit in custodial or trust accounts	1,201,000,000
State and municipal
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]
Total held to maturity, Amortized Cost	19,138,000	23,278,000
Total held to maturity, Gross Unrealized Gains	2,207,000	2,854,000
Total held to maturity, Gross Unrealized Losses	0	0
Total held to maturity, Fair Value	21,345,000	26,132,000
Total held to maturity, Carrying Value	19,138,000	23,278,000
Held to maturity:
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]
Total held to maturity, Amortized Cost	77,129,000	72,901,000
Total held to maturity, Gross Unrealized Gains	16,246,000	17,501,000
Total held to maturity, Gross Unrealized Losses	0	0
Total held to maturity, Fair Value	93,375,000	90,402,000
Total held to maturity, Carrying Value	77,129,000	72,901,000
Residential mortgage-backed
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]
Total held to maturity, Amortized Cost	0	4,998,000
Total held to maturity, Gross Unrealized Gains	0	291,000
Total held to maturity, Gross Unrealized Losses	0	0
Total held to maturity, Fair Value	0	5,289,000
Total held to maturity, Carrying Value	$ 0	$ 4,998,000

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Investments in Fixed Maturity Securities (The Amortized Cost and Fair Value of Fixed Maturity Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Amortized Cost, Due in one year or less	$ 711,642
Amortized Cost, Due after one year through five years	4,056,450
Amortized Cost, Due after five years through ten years	3,653,308
Amortized Cost, Due after ten years	2,476,413
Amortized Cost, Mortgage-backed securities	1,210,495
Total investment in fixed maturity securities, Amortized Cost	12,108,308	$ 12,223,264
Fair Value, Due in one year or less	717,075
Fair Value, Due after one year through five years	4,185,436
Fair Value, Due after five years through ten years	3,795,614
Fair Value, Due after ten years	2,543,518
Fair Value, Mortgage-backed securities	1,221,204
Total investments in fixed maturity securities, Fair Value	$ 12,462,847	$ 12,725,806

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Investments in Fixed Maturity Securities (Narrative) (Details) $ in Millions	Dec. 31, 2015 USD ($)
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]
Held-to-maturity Securities, Restricted	$ 963
Minimum ownership of Common stockholders equity	10.00%
Insurance-related Assessments [Member]
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]
Held-to-maturity Securities, Restricted	$ 182
Reinsurance-Global
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]
Held-to-maturity Securities, Restricted	41
Letters of Credit Outstanding, Amount	$ 15

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Investments in Equity Securities Available for Sale (Investments in Equity Securities Available for Sale) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Cost	$ 165,192	$ 160,295
Gross Unrealized, Gains	8,216	20,314
Gross Unrealized, Losses	(22,542)	(9,618)
Carrying value and fair value of equity securities	150,866	170,991
Common stocks
Schedule of Available-for-sale Securities [Line Items]
Cost	56,462	69,870
Gross Unrealized, Gains	0	11,929
Gross Unrealized, Losses	(19,189)	(5,453)
Carrying value and fair value of equity securities	37,273	76,346
Preferred stocks
Schedule of Available-for-sale Securities [Line Items]
Cost	108,730	90,425
Gross Unrealized, Gains	8,216	8,385
Gross Unrealized, Losses	(3,353)	(4,165)
Carrying value and fair value of equity securities	$ 113,593	$ 94,645

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Arbitrage Trading Account (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Trading Securities and Derivative Instruments [Abstract]
Arbitrage trading account	$ 376,697	$ 450,648
Options Held | Long
Derivative [Line Items]
Other derivatives not designated as hedging instruments at fair value, net	3,000
Derivative, notional amount	52,000
Options Held | Short
Derivative [Line Items]
Other derivatives not designated as hedging instruments at fair value, net	1,000
Derivative, notional amount	$ 62,000

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Net Investment Income (Net Investment Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net Investment Income [Line Items]
Gross investment income	$ 523,362	$ 610,530	$ 554,308
Investment expense	(10,717)	(9,645)	(10,017)
Net investment income	512,645	600,885	544,291
Fixed maturity securities, including cash and cash equivalents and loans receivable
Net Investment Income [Line Items]
Gross investment income	428,325	439,489	442,287
Equity securities available for sale
Net Investment Income [Line Items]
Gross investment income	4,624	6,726	11,380
Investment funds
Net Investment Income [Line Items]
Gross investment income	62,228	131,649	67,712
Arbitrage trading account
Net Investment Income [Line Items]
Gross investment income	16,891	22,438	20,431
Real estate
Net Investment Income [Line Items]
Gross investment income	$ 11,294	$ 10,228	$ 12,498

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Investment Funds (Schedule of Investment Funds) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	21.00%
Equity Method Investments, Fair Value Disclosure	$ 300,100
Investment funds	1,170,040	$ 1,211,401
Income (Losses)	62,228	131,649	$ 67,712
Real estate
Schedule of Equity Method Investments [Line Items]
Investment funds	580,830	466,703
Income (Losses)	58,032	26,233	9,315
Energy
Schedule of Equity Method Investments [Line Items]
Investment funds	93,719	152,056
Income (Losses)	(37,373)	12,797	29,739
Hedged equity
Schedule of Equity Method Investments [Line Items]
Investment funds	70,580	282,335
Income (Losses)	(2,762)	10,760	7,655
Other funds
Schedule of Equity Method Investments [Line Items]
Investment funds	424,911	310,307
Income (Losses)	44,331	$ 81,859	$ 21,003
Equity Method Investee [Member]
Schedule of Equity Method Investments [Line Items]
Investment funds	$ 45,400

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Real Estate (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Real Estate [Abstract]
Properties in operation	$ 226,055	$ 196,980
Properties under development	710,312	534,632
Total	$ 936,367	$ 731,612

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Real Estate (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Real Estate [Abstract]
Accumulated depreciation and amortization on properites	$ 9,073,000	$ 1,609,000
Depreciation	7,425,000	$ 4,808,000
Lease future minimum payments 2016	13,141,756
Lease future minimum payments 2017	15,483,248
Lease future minimum payments 2018	14,623,307
Lease future minimum payments 2019	11,967,190
Lease future minimum payments 2020	9,584,128
Lease future minimum payments thereafter	$ 352,328,662

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Loans Receivable (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Loans Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 273,103	$ 322,012
Loans receivable	$ 275,747	325,219
Debt Instrument, Term	10 years
Total loans receivable	$ 273,103	322,012
Valuation allowance, Specific	0	115
Valuation allowance, General	2,094	2,371
Valuation allowance	2,094	2,486
Increase (decrease) in valuation allowance	(392)	398
Loans in nonaccrual status	3,100	14,200
Real Estate
Loans Receivable [Line Items]
Loans and Leases Receivable, Gross	200,499	243,407
Loans receivable	201,641	245,112
Commercial
Loans Receivable [Line Items]
Loans and Leases Receivable, Gross	72,604	78,605
Loans receivable	$ 74,106	$ 80,107

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Realized and Unrealized Investment Gains and Losses (Realized and Unrealized Investment Gains (Losses) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment	$ 33,300,000	$ 0	$ 6,000,000
Fixed maturity securities, Gains	23,755,000	39,113,000	48,860,000
Fixed maturity securities, Losses	(4,065,000)	(4,420,000)	(14,670,000)
Investment funds	93,529,000	96,204,000	10,976,000
Gain (Loss) on Sale of Properties	0	85,659,000	0
Other gains	2,775,000	0	12,185,000
Net realized gains on investments sales	125,633,000	254,852,000	127,586,000
Other-than-temporary impairments	(33,309,000)	0	(6,042,000)
Net other-than-temporary impairments	(33,309,000)	0	(6,042,000)
Equity securities available for sale	9,639,000	38,296,000	70,235,000
Net investment gains	92,324,000	254,852,000	121,544,000
Income tax expense	(32,313,000)	(89,198,000)	(47,426,000)
Total after-tax investment gains	60,011,000	165,654,000	$ 74,118,000
Fixed Income Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment	9,000,000	$ 0
Equity securities available for sale
Schedule of Available-for-sale Securities [Line Items]
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment	$ 24,300,000

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Realized and Unrealized Investment Gains and Losses (Change in Unrealized Gains (Losses) of Available For Sales Securities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Realized and Unrealized Investment Gains Losses [Line Items]
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment	$ 33,300	$ 0	$ 6,000
Total change in unrealized gains (losses) before income taxes and noncontrolling interests	(192,186)	72,889	(399,122)
Income tax benefit (expense)	66,644	(23,223)	138,058
Noncontrolling interests	38	(33)	(28)
Total change in unrealized gains and losses	(125,504)	49,633	(261,092)
Debt Securities
Realized and Unrealized Investment Gains Losses [Line Items]
Total change in unrealized gains (losses) before income taxes and noncontrolling interests	(144,445)	155,765	(401,812)
Debt Securities Previously Impaired
Realized and Unrealized Investment Gains Losses [Line Items]
Total change in unrealized gains (losses) before income taxes and noncontrolling interests	(174)	865	1,076
Equity securities available for sale
Realized and Unrealized Investment Gains Losses [Line Items]
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment	24,300
Total change in unrealized gains (losses) before income taxes and noncontrolling interests	(27,809)	(69,016)	11,864
Investment funds
Realized and Unrealized Investment Gains Losses [Line Items]
Total change in unrealized gains (losses) before income taxes and noncontrolling interests	$ (19,758)	$ (14,725)	$ (10,250)

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Securities in an Unrealized Loss Position (Securities in an Unrealized Loss Position) (Details)	12 Months Ended
	Dec. 31, 2015 USD ($) position	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment	$ 33,300,000	$ 0	$ 6,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Less Than 12 Months, Fair Value	3,497,447,000	2,024,847,000
Available-for-sale Securities, Less Than 12 Months, Gross Unrealized Losses	78,466,000	20,681,000
Available-for-sale Securities, 12 Months or Greater, Fair Value	672,929,000	870,357,000
Available-for-sale Securities, 12 Months or Greater, Gross Unrealized Losses	35,482,000	48,461,000
Available-for-sale Securities, Fair Value	4,170,376,000	2,895,204,000
Available For Sale Securities, Gross Unrealized Losses	113,948,000	69,142,000
Fixed Income Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment	9,000,000	0
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	101,660,000	84,750,000
Available-for-sale Securities, Less Than 12 Months, Gross Unrealized Losses	487,000	522,000
Available-for-sale Securities, 12 Months or Greater, Fair Value	64,500,000	84,850,000
Available-for-sale Securities, 12 Months or Greater, Gross Unrealized Losses	1,846,000	2,635,000
Available-for-sale Securities, Fair Value	166,160,000	169,600,000
Available For Sale Securities, Gross Unrealized Losses	2,333,000	3,157,000
Held to maturity:
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Less Than 12 Months, Fair Value	501,952,000	158,594,000
Available-for-sale Securities, Less Than 12 Months, Gross Unrealized Losses	4,404,000	631,000
Available-for-sale Securities, 12 Months or Greater, Fair Value	106,681,000	150,284,000
Available-for-sale Securities, 12 Months or Greater, Gross Unrealized Losses	1,865,000	3,389,000
Available-for-sale Securities, Fair Value	608,633,000	308,878,000
Available For Sale Securities, Gross Unrealized Losses	6,269,000	4,020,000
Mortgage-backed securities
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Less Than 12 Months, Fair Value	381,986,000	75,739,000
Available-for-sale Securities, Less Than 12 Months, Gross Unrealized Losses	3,639,000	332,000
Available-for-sale Securities, 12 Months or Greater, Fair Value	184,807,000	312,922,000
Available-for-sale Securities, 12 Months or Greater, Gross Unrealized Losses	7,669,000	9,169,000
Available-for-sale Securities, Fair Value	566,793,000	388,661,000
Available For Sale Securities, Gross Unrealized Losses	11,308,000	9,501,000
Asset-backed Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Less Than 12 Months, Fair Value	1,091,078,000	1,186,097,000
Available-for-sale Securities, Less Than 12 Months, Gross Unrealized Losses	7,703,000	6,217,000
Available-for-sale Securities, 12 Months or Greater, Fair Value	190,467,000	30,818,000
Available-for-sale Securities, 12 Months or Greater, Gross Unrealized Losses	6,711,000	5,757,000
Available-for-sale Securities, Fair Value	1,281,545,000	1,216,915,000
Available For Sale Securities, Gross Unrealized Losses	14,414,000	11,974,000
Residential mortgage-backed
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Less Than 12 Months, Fair Value	1,232,940,000	400,141,000
Available-for-sale Securities, Less Than 12 Months, Gross Unrealized Losses	35,406,000	2,480,000
Available-for-sale Securities, 12 Months or Greater, Fair Value	76,797,000	183,810,000
Available-for-sale Securities, 12 Months or Greater, Gross Unrealized Losses	8,987,000	10,327,000
Available-for-sale Securities, Fair Value	1,309,737,000	583,951,000
Available For Sale Securities, Gross Unrealized Losses	44,393,000	12,807,000
Corporate backed
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Less Than 12 Months, Fair Value	169,190,000	76,471,000
Available-for-sale Securities, Less Than 12 Months, Gross Unrealized Losses	8,822,000	3,907,000
Available-for-sale Securities, 12 Months or Greater, Fair Value	19,528,000	85,025,000
Available-for-sale Securities, 12 Months or Greater, Gross Unrealized Losses	3,867,000	14,158,000
Available-for-sale Securities, Fair Value	188,718,000	161,496,000
Available For Sale Securities, Gross Unrealized Losses	12,689,000	18,065,000
Fixed maturity securities
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Less Than 12 Months, Fair Value	3,478,806,000	1,981,792,000
Available-for-sale Securities, Less Than 12 Months, Gross Unrealized Losses	60,461,000	14,089,000
Available-for-sale Securities, 12 Months or Greater, Fair Value	642,780,000	847,709,000
Available-for-sale Securities, 12 Months or Greater, Gross Unrealized Losses	30,945,000	45,435,000
Available-for-sale Securities, Fair Value	4,121,586,000	2,829,501,000
Available For Sale Securities, Gross Unrealized Losses	91,406,000	59,524,000
Common stocks
Schedule of Available-for-sale Securities [Line Items]
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment	$ 10,900,000	0
Number Of Securities | position	2
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Less Than 12 Months, Fair Value	$ 18,641,000	15,929,000
Available-for-sale Securities, Less Than 12 Months, Gross Unrealized Losses	18,005,000	5,453,000
Available-for-sale Securities, 12 Months or Greater, Fair Value	7,829,000	0
Available-for-sale Securities, 12 Months or Greater, Gross Unrealized Losses	1,184,000	0
Available-for-sale Securities, Fair Value	26,470,000	15,929,000
Available For Sale Securities, Gross Unrealized Losses	19,189,000	5,453,000
Preferred stocks
Schedule of Available-for-sale Securities [Line Items]
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment	$ 13,400,000	0
Number Of Securities | position	1
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Less Than 12 Months, Fair Value	$ 0	27,126,000
Available-for-sale Securities, Less Than 12 Months, Gross Unrealized Losses	0	1,139,000
Available-for-sale Securities, 12 Months or Greater, Fair Value	22,320,000	22,648,000
Available-for-sale Securities, 12 Months or Greater, Gross Unrealized Losses	3,353,000	3,026,000
Available-for-sale Securities, Fair Value	22,320,000	49,774,000
Available For Sale Securities, Gross Unrealized Losses	3,353,000	4,165,000
Equity securities available for sale
Schedule of Available-for-sale Securities [Line Items]
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment	24,300,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Less Than 12 Months, Fair Value	18,641,000	43,055,000
Available-for-sale Securities, Less Than 12 Months, Gross Unrealized Losses	18,005,000	6,592,000
Available-for-sale Securities, 12 Months or Greater, Fair Value	30,149,000	22,648,000
Available-for-sale Securities, 12 Months or Greater, Gross Unrealized Losses	4,537,000	3,026,000
Available-for-sale Securities, Fair Value	48,790,000	65,703,000
Available For Sale Securities, Gross Unrealized Losses	$ 22,542,000	$ 9,618,000

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Securities in an Unrealized Loss Position (Non-Investment Grade Fixed Maturity Securities) (Details) $ in Thousands	Dec. 31, 2015 USD ($) position	Dec. 31, 2014 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Aggregate Fair Value	$ 4,170,376	$ 2,895,204
Preferred stocks
Schedule of Available-for-sale Securities [Line Items]
Number Of Securities | position	1
Aggregate Fair Value	$ 22,320	49,774
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Aggregate Fair Value	566,793	388,661
Asset-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Aggregate Fair Value	1,281,545	1,216,915
Residential mortgage-backed
Schedule of Available-for-sale Securities [Line Items]
Aggregate Fair Value	1,309,737	583,951
Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Aggregate Fair Value	$ 4,121,586	$ 2,829,501
Unrealized Loss Less than 5 Million | Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Number Of Securities	8
Aggregate Fair Value	$ 23,370
Gross Unrealized Loss	$ 1,790
Unrealized Loss Less than 5 Million | Asset-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Number Of Securities	7
Aggregate Fair Value	$ 19,535
Gross Unrealized Loss	$ 264
Unrealized Loss Less than 5 Million | Residential mortgage-backed
Schedule of Available-for-sale Securities [Line Items]
Number Of Securities	12
Aggregate Fair Value	$ 128,716
Gross Unrealized Loss	$ 6,717
Unrealized Loss Less than 5 Million | State and Municipal
Schedule of Available-for-sale Securities [Line Items]
Number Of Securities	1
Aggregate Fair Value	$ 13,956
Gross Unrealized Loss	$ 3,766
Unrealized Loss Less than 5 Million | Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Number Of Securities	28
Aggregate Fair Value	$ 185,577
Gross Unrealized Loss	$ 12,537

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Securities in an Unrealized Loss Position (Narrative) (Details) $ in Thousands	Dec. 31, 2015 USD ($) position	Dec. 31, 2014 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Securities in continuous unrealized loss position fair value	$ 4,170,376	$ 2,895,204
Securities in continuous unrealized loss position, aggregate losses accumulated In AOCI	113,948	69,142
Loans and Leases Receivable, Other, Allowance	$ 2,000	3,000
Preferred stocks
Schedule of Available-for-sale Securities [Line Items]
Securities in unrealized loss positions | position	1
Securities in continuous unrealized loss position fair value	$ 22,320	49,774
Securities in continuous unrealized loss position, aggregate losses accumulated In AOCI	$ 3,353	4,165
Common stocks
Schedule of Available-for-sale Securities [Line Items]
Securities in unrealized loss positions | position	2
Securities in continuous unrealized loss position fair value	$ 26,470	15,929
Securities in continuous unrealized loss position, aggregate losses accumulated In AOCI	$ 19,189	$ 5,453

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Fair Value Measurements (Assets and Liabilities Measured At Fair Value, On a Recurring Basis) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities available for sale	$ 12,348,127,000	$ 12,603,983,000
Equity securities available for sale	150,866,000	170,991,000
Arbitrage trading account	376,697,000	450,648,000
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	11,982,000	35,939,000	$ 49,634,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	(869,000)	2,304,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	(82,000)	(4,622,000)
Impairment of Intangible Assets (Excluding Goodwill)	(2,331,000)	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	72,640,000	19,953,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	72,229,000	33,698,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	1,820,000	3,429,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	19,266,000	(5,797,000)
Asset-backed 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	199,000	20,611,000	42,710,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	19,000	47,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	191,000	(3,711,000)
Impairment of Intangible Assets (Excluding Goodwill)	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0	238,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	0	(15,244,000)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	(1,820,000)	(3,429,000)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	(18,802,000)	0
Residential mortgage-backed | 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	154,000	154,000	154,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0	0
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	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	0	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 out of Level 3	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	353,000	20,765,000	42,864,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	19,000	47,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	191,000	(3,711,000)
Impairment of Intangible Assets (Excluding Goodwill)	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0	238,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	0	15,244,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	1,820,000	3,429,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	18,802,000	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	7,829,000	10,741,000	1,238,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	(273,000)	(911,000)
Impairment of Intangible Assets (Excluding Goodwill)	(2,331,000)	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0	11,343,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	308,000	929,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	0	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	3,624,000	3,713,000	3,752,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	(89,000)	(17,000)
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	0	3,430,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	0	3,452,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	0	0
Equity securities available for sale | 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	11,453,000	14,454,000	4,990,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	(89,000)	(17,000)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	(273,000)	(911,000)
Impairment of Intangible Assets (Excluding Goodwill)	(2,331,000)	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0	14,773,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	308,000	4,381,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	0	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	176,000	720,000	$ 1,780,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	(799,000)	2,274,000
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	72,640,000	4,942,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	71,921,000	14,073,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	(464,000)	5,797,000
Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities available for sale	12,348,127,000	12,603,983,000
Equity securities available for sale	150,866,000	170,991,000
Arbitrage trading account	376,697,000	450,648,000
Total assets	12,875,690,000	13,225,622,000
Securities sold but not yet purchased	37,035,000	106,079,000
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 available for sale	29,444,000	65,605,000
Arbitrage trading account	256,914,000	295,047,000
Total assets	286,358,000	360,652,000
Securities sold but not yet purchased	35,559,000	106,074,000
Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities available for sale	12,347,774,000	12,583,218,000
Equity securities available for sale	109,969,000	90,932,000
Arbitrage trading account	119,607,000	154,881,000
Total assets	12,577,350,000	12,829,031,000
Securities sold but not yet purchased	1,476,000	5,000
Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities available for sale	353,000	20,765,000
Equity securities available for sale	11,453,000	14,454,000
Arbitrage trading account	176,000	720,000
Total assets	11,982,000	35,939,000
Securities sold but not yet purchased	0	0
Recurring | Asset-backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities available for sale	1,705,172,000	2,025,926,000
Recurring | Asset-backed Securities [Member] | 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 [Member] | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities available for sale	1,704,973,000	2,005,315,000
Recurring | Asset-backed Securities [Member] | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities available for sale	199,000	20,611,000
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	670,419,000	803,388,000
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	670,419,000	803,388,000
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 | Held to maturity:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities available for sale	4,460,179,000	4,362,996,000
Recurring | Held to maturity: | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities available for sale	0	0
Recurring | Held to maturity: | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities available for sale	4,460,179,000	4,362,996,000
Recurring | Held to maturity: | 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	1,199,859,000	1,295,636,000
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	1,199,859,000	1,295,636,000
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 | Residential mortgage-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities available for sale	3,475,038,000	3,174,211,000
Recurring | Residential mortgage-backed | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities available for sale	0	0
Recurring | Residential mortgage-backed | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities available for sale	3,474,884,000	3,174,057,000
Recurring | Residential mortgage-backed | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities available for sale	154,000	154,000
Recurring | Corporate backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities available for sale	837,460,000	941,826,000
Recurring | Corporate backed | 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 backed | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities available for sale	837,460,000	941,826,000
Recurring | Corporate backed | 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 available for sale	37,273,000	76,346,000
Recurring | Common stocks | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities available for sale	29,444,000	65,605,000
Recurring | Common stocks | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities available for sale	0	0
Recurring | Common stocks | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities available for sale	7,829,000	10,741,000
Recurring | Preferred stocks
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities available for sale	113,593,000	94,645,000
Recurring | Preferred stocks | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities available for sale	0	0
Recurring | Preferred stocks | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities available for sale	109,969,000	90,932,000
Recurring | Preferred stocks | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities available for sale	$ 3,624,000	$ 3,713,000

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Fair Value Measurements (Summarize Changes in Level 3 Assets and Liabilities) (Details) - Level 3 - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 0	$ 0
Earnings	0	(20,000)
Other Comprehensive Income	0	0
Fair Value, Impairment of Intangible Assets (Excluding Goodwill)	0
Purchases	0	31,000
Sales	0	(11,000)
Paydown/Maturities	0	0
Out	0	0
Ending balance	0	0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	35,939,000	49,634,000
Earnings	(869,000)	2,304,000
Other Comprehensive Income	(82,000)	(4,622,000)
Impairment of Intangible Assets (Excluding Goodwill)	(2,331,000)	0
Purchases	72,640,000	19,953,000
Sales	(72,229,000)	(33,698,000)
Paydowns / Maturities	(1,820,000)	(3,429,000)
Out	(19,266,000)	5,797,000
Ending Balance	11,982,000	35,939,000
Residential mortgage-backed
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	154,000	154,000
Earnings	0	0
Other Comprehensive Income	0	0
Impairment of Intangible Assets (Excluding Goodwill)	0	0
Purchases	0	0
Sales	0	0
Paydowns / Maturities	0	0
Out	0	0
Ending Balance	154,000	154,000
Fixed maturity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	20,765,000	42,864,000
Earnings	19,000	47,000
Other Comprehensive Income	191,000	(3,711,000)
Impairment of Intangible Assets (Excluding Goodwill)	0	0
Purchases	0	238,000
Sales	0	(15,244,000)
Paydowns / Maturities	(1,820,000)	(3,429,000)
Out	(18,802,000)	0
Ending Balance	353,000	20,765,000
Common stocks
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	10,741,000	1,238,000
Earnings	0	0
Other Comprehensive Income	(273,000)	(911,000)
Impairment of Intangible Assets (Excluding Goodwill)	(2,331,000)	0
Purchases	0	11,343,000
Sales	(308,000)	(929,000)
Paydowns / Maturities	0	0
Out	0	0
Ending Balance	7,829,000	10,741,000
Preferred stocks
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	3,713,000	3,752,000
Earnings	(89,000)	(17,000)
Other Comprehensive Income	0	0
Impairment of Intangible Assets (Excluding Goodwill)	0	0
Purchases	0	3,430,000
Sales	0	(3,452,000)
Paydowns / Maturities	0	0
Out	0	0
Ending Balance	3,624,000	3,713,000
Equity securities available for sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	14,454,000	4,990,000
Earnings	(89,000)	(17,000)
Other Comprehensive Income	(273,000)	(911,000)
Impairment of Intangible Assets (Excluding Goodwill)	(2,331,000)	0
Purchases	0	14,773,000
Sales	(308,000)	(4,381,000)
Paydowns / Maturities	0	0
Out	0	0
Ending Balance	11,453,000	14,454,000
Trading account
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	720,000	1,780,000
Earnings	(799,000)	2,274,000
Other Comprehensive Income	0	0
Impairment of Intangible Assets (Excluding Goodwill)	0	0
Purchases	72,640,000	4,942,000
Sales	(71,921,000)	(14,073,000)
Paydowns / Maturities	0	0
Out	464,000	(5,797,000)
Ending Balance	$ 176,000	$ 720,000

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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, 2015	Dec. 31, 2014		Dec. 31, 2013
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Net reserves at beginning of year		$ 8,970,641	$ 8,683,797		$ 8,411,851
Net provision for losses and loss expenses:
Claims occuring during the current year		3,653,561	3,495,825	[1]	3,221,393	[1]
Decrease in estimates for claims occurring in prior years		(46,713)	(75,764)	[2],[3]	(78,810)	[2],[3]
Loss reserve discount accretion(4)	[4]	49,422	70,506		54,441
Total		3,656,270	3,490,567		3,197,024
Net payments for claims:
Current year		914,637	898,944		822,787
Prior year		2,342,378	2,216,283		2,055,284
Total		3,257,015	3,115,227		2,878,071
Foreign currency translation		(125,024)	(88,496)		(47,007)
Net reserves at end of year		9,244,872	8,970,641		8,683,797
Ceded reserve at end of year		1,424,278	1,399,060		1,397,144
Gross reserves at end of year		10,669,150	10,369,701		10,080,941
Workers' Compensation Discount, Current Year Amount		20,357	21,306		22,680
Decrease in estimates for claims occurring in prior years, undiscounted basis		64,971	116,866		77,430
Favorable reserve development and return premiums		$ 63,000	$ 85,000		$ 98,000

[1] Claims occurring during the current year are net of loss reserve discounts of $20,357,000, $21,306,000, and $22,680,000 in 2015, 2014 and 2013, respectively.

[2] For certain retrospectively rated insurance polices and reinsurance agreements, reserve development is offset by additional or return premiums. Favorable reserve development, net of additional and return premiums, was $63 million, $85 million and $98 million in 2015, 2014 and 2013, respectively.

[3] The 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 $64,971,000, $116,866,000 and $77,430,000 in 2015, 2014 and 2013, respectively.

[4] In 2014, the Company entered into a commutation agreement that resulted in a reduction in prior year workers' compensation reserves of $30 million on an undiscounted basis and $12 million on a discounted basis.

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Reserves For Losses And Loss Expenses (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reserves For Losses And Loss Expenses [Line Items]
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims, Prior Years, Reserve Development, Net of Premiums, Favorable (Unfavorable)	$ 63,000	$ 85,000	$ 98,000
Prior year	2,342,378	2,216,283	2,055,284
Favorable Reserve Development Net Of Premium Offsets	63,000	85,000	98,000
Reserve for losses and loss adjustment expenses relating to asbestos and environmental claims, net	33,000	36,000
Reserve for losses and loss adjustment expenses relating to asbestos and environmental claims, gross	51,000	56,000
Increase (decrease) in net incurred losses and loss expenses relating to asbestos and environmental claims	2,000	4,000	5,000
Net paid losses and loss expenses for asbestos and environmental claims	2,000	3,000	3,000
Undiscounted [Member]
Reserves For Losses And Loss Expenses [Line Items]
Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims Undiscounted Basis Prior Years	30,000
Discounted [Member]
Reserves For Losses And Loss Expenses [Line Items]
Prior year	12,000
Insurance-Domestic
Reserves For Losses And Loss Expenses [Line Items]
Favorable Reserve Development Net Of Premium Offsets	47,000	92,000
Insurance-Domestic | Other Insurance Liabilities [Member]
Reserves For Losses And Loss Expenses [Line Items]
Favorable Reserve Development Net Of Premium Offsets			39,000
Insurance-Domestic | Workers' Compensation [Member]
Reserves For Losses And Loss Expenses [Line Items]
Favorable Reserve Development Net Of Premium Offsets			22,000
Insurance-Domestic | Property Insurance Product Line [Member]
Reserves For Losses And Loss Expenses [Line Items]
Favorable Reserve Development Net Of Premium Offsets			18,000
Insurance-Domestic | Other Insurance Product Line [Member]
Reserves For Losses And Loss Expenses [Line Items]
Favorable Reserve Development Net Of Premium Offsets			24,000
Insurance-Domestic | Commercial Automobile [Member]
Reserves For Losses And Loss Expenses [Line Items]
reserve development unfavorable			23,000
Insurance-Domestic | Products Liability
Reserves For Losses And Loss Expenses [Line Items]
reserve development unfavorable			14,000
Reinsurance-Global
Reserves For Losses And Loss Expenses [Line Items]
Favorable Reserve Development Net Of Premium Offsets	11,000	16,000
Reinsurance-Global | Assumed Business [Member]
Reserves For Losses And Loss Expenses [Line Items]
Favorable Reserve Development Net Of Premium Offsets			$ 32,000
Insurance-International
Reserves For Losses And Loss Expenses [Line Items]
Favorable Reserve Development Net Of Premium Offsets	$ 5,000
Adverse Reserve Development		$ 23,000

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Reinsurance (Reinsurance Financial Information) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reinsurance Disclosures [Abstract]
Due from reinsurers	$ 1,532,829	$ 1,503,441
Written premiums, Direct	6,412,533	6,185,242	$ 5,626,172
Written premiums, Assumed	837,460	877,596	884,919
Written premiums, Ceded	(1,060,478)	(1,065,891)	(1,010,918)
Total net premiums written	6,189,515	5,996,947	5,500,173
Earned premiums, Direct	6,245,714	5,889,021	5,328,955
Earned premiums, Assumed	845,735	886,063	857,119
Earned premiums, Ceded	(1,050,840)	(1,030,666)	(959,537)
Net premiums earned	6,040,609	5,744,418	5,226,537
Ceded losses incurred	501,999	475,802	556,108
Uncollectible reinsurance	1,020	1,144	1,385
Fees and Commissions, Other	$ 129,766	$ 160,215	$ 137,449

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Reinsurance (Schedule Of Ceded Credit Risk by Reinsurer) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Ceded Credit Risk [Line Items]
Ceded reserve at end of year	$ 1,532,829	$ 1,503,441
Credit Risk Reinsurers, Subtotal, Excluding Residual Market Pools [Member]
Ceded Credit Risk [Line Items]
Ceded reserve at end of year	1,029,323
Alleghany Group
Ceded Credit Risk [Line Items]
Ceded reserve at end of year	138,163
Munich Re
Ceded Credit Risk [Line Items]
Ceded reserve at end of year	121,661
Swiss Re
Ceded Credit Risk [Line Items]
Ceded reserve at end of year	115,215
Lloyds of London
Ceded Credit Risk [Line Items]
Ceded reserve at end of year	92,635
Axis Capital
Ceded Credit Risk [Line Items]
Ceded reserve at end of year	69,840
Partner Re
Ceded Credit Risk [Line Items]
Ceded reserve at end of year	65,793
Hannover Re Group
Ceded Credit Risk [Line Items]
Ceded reserve at end of year	48,675
Everest Re
Ceded Credit Risk [Line Items]
Ceded reserve at end of year	47,945
Berkshire Hathaway
Ceded Credit Risk [Line Items]
Ceded reserve at end of year	47,309
Chubb Ltd. [Member]
Ceded Credit Risk [Line Items]
Ceded reserve at end of year	45,645
Arch Capital Group
Ceded Credit Risk [Line Items]
Ceded reserve at end of year	23,273
Other Reinsurers
Ceded Credit Risk [Line Items]
Ceded reserve at end of year	213,169
Residual Market Pools
Ceded Credit Risk [Line Items]
Ceded reserve at end of year	$ 503,506

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Indebtedness (Details) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Subsidiary Debt
Debt Instrument [Line Items]
Face Value		$ 81,752
Carrying Value	[1]	81,752	$ 154,223
Repayments in 2015			43,000
Repayments in 2016			37,000
Repayments thereafter			2,000
Senior Notes and Other Debt
Debt Instrument [Line Items]
Face Value		1,858,255
Carrying Value		1,844,621	$ 2,115,527
Senior Notes | Senior Notes due May 15, 2015
Debt Instrument [Line Items]
Rate			5.60%
Face Value		0
Carrying Value		0	$ 199,930
Senior Notes | Senior Notes due August 15, 2019
Debt Instrument [Line Items]
Rate			6.15%
Face Value		150,000
Carrying Value		149,484	$ 149,342
Senior Notes | Senior Notes due September 15, 2019
Debt Instrument [Line Items]
Rate			7.375%
Face Value		300,000
Carrying Value		299,054	$ 298,800
Senior Notes | Senior Notes due September 15, 2020
Debt Instrument [Line Items]
Rate			5.375%
Face Value		300,000
Carrying Value		298,411	$ 298,074
Senior Notes | Senior Notes due January 1, 2022
Debt Instrument [Line Items]
Rate			8.70%
Face Value		76,503
Carrying Value		76,097	$ 76,048
Senior Notes | Senior Notes due March 15, 2022
Debt Instrument [Line Items]
Rate			4.625%
Face Value		350,000
Carrying Value		347,417	$ 346,999
Senior Notes | Senior Notes due February 15, 2037
Debt Instrument [Line Items]
Rate			6.25%
Face Value		250,000
Carrying Value		247,676	$ 247,566
Senior Notes | Senior Notes due August 1, 2044 [Member]
Debt Instrument [Line Items]
Rate			4.75%
Face Value		350,000
Carrying Value		344,730	$ 344,545
Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Face Value			350,000
Carrying Value		$ 340,320	$ 340,060
Junior Subordinated Debt [Member] | Five Point Six Two Five Percent Subordinated Debentures [Member]
Debt Instrument [Line Items]
Rate			5.625%

[1] Subsidiary debt is due as follows: $43 million in 2016, $37 million in 2017 and $2 million thereafter.

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Income Taxes (Schedule of Components of Income Tax Expense (Benefit)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Current Expense, Domestic	$ 179,150	$ 258,337	$ 116,802
Deferred Expense (Benefit), Domestic	31,145	28,029	47,370
Domestic, Total	210,295	286,366	164,172
Current Expense, Foreign	(2,318)	12,969	22,362
Deferred Expense (Benefit), Foreign	19,946	3,258	7,053
Foreign, Total	17,628	16,227	29,415
Current Expense, Total	176,832	271,306	139,164
Deferred Expense (Benefit), Total	51,091	31,287	54,423
Total expense	227,923	302,593	193,587
Income (Loss) from Continuing Operations before Income Taxes, Domestic	689,000	910,000	598,000
Income (Loss) from Continuing Operations before Income Taxes, Foreign	$ 43,000	$ 42,000	$ 101,000

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Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Statutory federal income tax rate	35.00%
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Computed “expected” tax expense	$ 256,210	$ 333,269	$ 244,611
Tax-exempt investment income	(39,283)	(38,757)	(40,679)
Change in valuation allowance	2,702	1,335	0
Impact of foreign tax rates	4,447	6,239	(4,851)
State and local taxes	940	2,375	2,906
Other, net	2,907	(1,868)	(8,400)
Total expense	$ 227,923	$ 302,593	$ 193,587

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Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Deferred tax asset:
Loss reserve discounting	$ 100,806,000	$ 77,216,000
Unearned premiums	176,465,000	165,075,000
Other-than-temporary impairments	26,509,000	45,367,000
Restricted stock units	62,442,000	60,061,000
Other	89,761,000	101,131,000
Gross deferred tax asset	455,983,000	448,850,000
Less valuation allowance	(4,037,000)	(1,335,000)
Deferred tax asset	451,946,000	447,515,000
Deferred tax liability:
Amortization of intangibles	20,316,000	22,747,000
Deferred policy acquisition costs	162,344,000	152,001,000
Unrealized investment gains	115,499,000	175,111,000
Other	160,598,000	135,108,000
Deferred tax liability	458,757,000	484,967,000
Net deferred tax asset (liability)	(6,811,000)	(37,452,000)
Current Federal income taxes	55,763,000	67,623,000
Operating Loss Carryforwards [Line Items]
Taxes Payable, Current		67,623,000
Tax Credit Carryforward, Valuation Allowance	4,000,000	$ 1,300,000
Foreign Tax Authority (expiration 2031) [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 6,100,000

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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, 2015	Dec. 31, 2014	Dec. 31, 2013
Insurance [Abstract]
Amount available for dividend distribution without prior approval from regulatory authorities	$ 684,000
Net income	813,303	$ 757,010	$ 468,850
Policyholders' surplus	5,296,435	$ 5,438,063	$ 4,908,010
Increase in BIC's statutory capital and surplus	294,000
Total Adjusted Capital percentage threshold		200.00%
BIC's Total Adjusted Capital balance	$ 5,000,000
BIC's Total Adjusted Capital balance as percentage of RBC Authorized Control Level	456.00%

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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	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Equity [Abstract]
Basic	124,040,313	127,873,708	135,304,752
Diluted	130,188,866	133,651,855	140,742,922

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Common Stockholders' Equity (Schedule of Changes in Shares of Common Stock Outstanding) (Details) - shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Common Stock Shares Outstanding [Roll Forward]
Balance, beginning of year	126,748,836	132,233,167	136,017,732
Shares issued	1,061,026	332,137	139,790
Shares repurchased	(4,502,025)	(5,816,468)	(3,924,355)
Balance, end of year	123,307,837	126,748,836	132,233,167

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Fair Value of Financial Instruments (Carrying Amounts and Estimated Fair Values of Financial Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Assets:
Arbitrage trading account	$ 376,697	$ 450,648
Loans receivable	275,747	325,219
Due To Broker	0	23,133
Due To Broker Fair Value	0	23,133
Carrying Value
Assets:
Fixed maturity securities	12,444,394	12,705,160
Equity securities available for sale	150,866	170,991
Arbitrage trading account	376,697	450,648
Loans receivable	273,103	322,012
Cash and cash equivalents	763,631	674,441
Trading accounts receivable from brokers and clearing organizations	383,115	371,034
Due from broker	1,713	0
Liabilities:
Trading account securities sold but not yet purchased	37,035	106,079
Subordinated debentures	340,320	340,060
Senior notes and other debt	1,844,621	2,115,527
Fair Value
Assets:
Fixed maturity securities	12,462,847	12,725,806
Equity securities available for sale	150,866	170,991
Arbitrage trading account	376,697	450,648
Loans receivable	275,747	325,219
Cash and cash equivalents	763,631	674,441
Trading accounts receivable from brokers and clearing organizations	383,115	371,034
Due from broker	1,713	0
Liabilities:
Trading account securities sold but not yet purchased	37,035	106,079
Subordinated debentures	355,880	332,640
Senior notes and other debt	$ 2,029,572	$ 2,344,292

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Lease Obligations (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Leases [Abstract]
Future minimum lease payment - due in 2016	$ 42,470,000
Future minimum lease payment - due in 2017	39,443,000
Future minimum lease payment - due in 2018	35,286,000
Future minimum lease payment - due in 2019	30,941,000
Future Minimum Payments, Due in 2020	28,584,000
Future minimum lease payment - due thereafter	105,825,000
Rental expense	$ 46,271,000	$ 45,198,000	$ 44,752,000

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Commitments, Litigation And Contingent Liabilities (Details) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Commitment to Invest in Certain Investment Funds	$ 117
Commitment to Invest in Real Estate Construction Projects	$ 485

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Stock Incentive Plan (Schedule of Share-based Compensation, Stock Options, Activity) (Details) - shares	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Number of outstanding options - vested and exercisable	3,375	3,375	1,314,057

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Stock Incentive Plan (Schedule of Nonvested Restricted Stock Units Activity) (Details) - shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement with Individual, Shares Issued	4,275,474
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	5 years
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:	5,330,445,000	4,491,520,000	4,701,120
Granted	997,522,000	1,154,950,000	108,400
Vested	(1,938,000,000)	(81,500,000)	(146,250)
Canceled	(231,642,000)	(234,525,000)	(171,750)
RSUs granted and unvested at end of period:	4,158,325,000	5,330,445,000	4,491,520,000

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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, 2015	Dec. 31, 2014	Dec. 31, 2013
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	$ 88,015	$ 73,205	$ 93,653
RSUs granted, net of cancellations	50,442	51,575	4,406
RSUs expensed	30,691	(27,966)	(22,881)
RSUs forfeitures	4,228	(8,799)	(1,973)
Unearned compensation at end of year	$ 103,538	$ 88,015	$ 73,205

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Compensation Plans (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) shares	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
LTIP Expense	$ 20,873	$ 23,011	$ 14,170
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%
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	38,000	34,000
2011 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	172,850
Long-Term Incentive Compensation Plan, Maximum Value	$ 43,200
Long-Term Incentive Compensation Plan, Earned	34,300
LTIP Expense	$ 7,397	9,855	6,939
2013 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	204,500
Long-Term Incentive Compensation Plan, Maximum Value	$ 51,100
Long-Term Incentive Compensation Plan, Earned	23,800
LTIP Expense	$ 7,336	9,493	7,231
Long-term Incentive Compensation Plan, 2014 [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Long-Term Incentive Compensation Plan, Number of Units Oustanding | shares	216,750
Long-Term Incentive Compensation Plan, Maximum Value	$ 21,700
Long-Term Incentive Compensation Plan, Earned	6,600
LTIP Expense	$ 2,935	3,663	0
Long-term Incentive Compensation Plan, 2015 [Member] [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Long-Term Incentive Compensation Plan, Number of Units Oustanding | shares	213,250,000
Long-Term Incentive Compensation Plan, Maximum Value	$ 21,300
Long-Term Incentive Compensation Plan, Earned	3,200
LTIP Expense	$ 3,205	$ 0	$ 0

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Retirement Benefits (Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Amortization of:
Total recognized in other comprehensive income	$ 0	$ (10,232)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net after tax unamortized periodic pension cost	(4,633,208)	(4,624,134)
Net pension asset
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net after tax unamortized periodic pension cost	$ 0	$ 0	$ 6,651	$ 15,351

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Retirement Benefits Retirement Benefits (narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation	$ 59,400,000
Pension Expense	$ 0	$ 9,994,000	$ 13,357,000
Supplemental Benefit Agreement (SBA) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefits Paid		$ 4,600,000	$ 300,000

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Supplemental Financial Statement Information (Schedule of Other Operating Cost and Expense, by Component) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Other Income and Expenses [Abstract]
Amortization of deferred policy acquisition costs	$ 1,102,492	$ 1,053,397	$ 991,070
Other underwriting expenses	903,006	843,133	780,058
Service company expenses	127,365	102,726	88,662
Net foreign currency losses (gains)	400	(27)	(10,120)
Other costs and expenses	156,487	158,227	151,014
Total	$ 2,289,750	$ 2,157,456	$ 2,000,684

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Industry Segments (Financial Information of Company Operating Segments) (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014		Dec. 31, 2013
Segment Reporting Information [Line Items]
Earned Premiums										$ 6,040,609	$ 5,744,418		$ 5,226,537
Investment Income										512,645	600,885		544,291
Other Revenues										653,203	783,625		637,706
Total revenues		$ 1,811,056	$ 1,860,957	$ 1,789,765	$ 1,744,679	$ 1,784,428	$ 1,840,605	$ 1,796,989	$ 1,706,906	7,206,457	7,128,928		6,408,534
Pre-Tax Income (Loss)										732,030	952,196		698,888
Net income to common stockholders		$ 109,745	$ 152,607	$ 123,035	$ 118,307	$ 110,711	$ 188,539	$ 179,961	$ 169,673	503,694	648,884		499,925
Net investment gains, before tax										92,324	254,852		121,544
Net investment gains, net of tax										60,011	165,654		74,118
Insurance-Domestic
Segment Reporting Information [Line Items]
Earned Premiums										4,659,359	4,271,933		3,782,416
Insurance-International
Segment Reporting Information [Line Items]
Earned Premiums										772,141	802,375		723,151
Reinsurance-Global
Segment Reporting Information [Line Items]
Earned Premiums										609,109	670,110		720,970
Net Investment Gains Segment [Member]
Segment Reporting Information [Line Items]
Earned Premiums										0	0		0
Investment Income										0	0		0
Operating Segments | Insurance-Domestic
Segment Reporting Information [Line Items]
Earned Premiums										4,659,359	4,271,933		3,782,416
Investment Income										358,935	428,632		404,280
Other Revenues										96,487	106,853		107,517
Total revenues										5,114,781	4,807,418		4,294,213
Pre-Tax Income (Loss)										724,667	796,309		648,740
Net income to common stockholders										495,082	539,461		449,981
Operating Segments | Insurance-International
Segment Reporting Information [Line Items]
Earned Premiums										772,141	802,375		723,151
Investment Income										51,522	55,407		47,039
Other Revenues										0	0		0
Total revenues										823,663	857,782		770,190
Pre-Tax Income (Loss)										51,926	29,779		56,922
Net income to common stockholders										37,204	22,182		40,292
Operating Segments | Reinsurance-Global
Segment Reporting Information [Line Items]
Earned Premiums										609,109	670,110		720,970
Investment Income										74,226	88,821		89,090
Other Revenues										0	0		0
Total revenues										683,335	758,931		810,060
Pre-Tax Income (Loss)										94,852	115,677		110,425
Net income to common stockholders										66,627	79,720		78,013
Corporate, Other and Eliminations Segment
Segment Reporting Information [Line Items]
Earned Premiums										0	0	[1]	0	[1]
Investment Income										27,962	28,025	[1]	3,882	[1]
Other Revenues										464,392	421,920	[1]	408,645	[1]
Total revenues	[1]									492,354	449,945		412,527
Pre-Tax Income (Loss)										(231,739)	(244,421)	[1]	(238,743)	[1]
Net income to common stockholders										$ (155,230)	$ (158,133)	[1]	$ (142,479)	[1]

[1] Corporate, other and eliminations represent corporate revenues and expenses and other items that are not allocated to business segments.

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Industry Segments (Identifiable Assets by Segment) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting, Asset Reconciling Item [Line Items]
Consolidated Assets	$ 21,730,967	$ 21,716,691
Operating Segments | Insurance-Domestic
Segment Reporting, Asset Reconciling Item [Line Items]
Consolidated Assets	16,351,737	16,065,409
Operating Segments | Insurance-International
Segment Reporting, Asset Reconciling Item [Line Items]
Consolidated Assets	1,711,993	1,879,438
Operating Segments | Reinsurance-Global
Segment Reporting, Asset Reconciling Item [Line Items]
Consolidated Assets	2,441,340	2,713,554
Corporate, Other and Eliminations Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Consolidated Assets	$ 1,225,897	$ 1,058,290	[1]

[1] Corporate, other and eliminations represent corporate revenues and expenses and other items that are not allocated to business segments.

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Industry Segments (Net Premiums Earned By Major Line of Business) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Net premiums earned	$ 6,040,609	$ 5,744,418	$ 5,226,537
Insurance-Domestic
Segment Reporting Information [Line Items]
Net premiums earned	4,659,359	4,271,933	3,782,416
Insurance-Domestic | Other Liability [Member]
Segment Reporting Information [Line Items]
Net premiums earned	1,546,157	1,449,425	1,259,376
Insurance-Domestic | Workers' Compensation [Member]
Segment Reporting Information [Line Items]
Net premiums earned	1,269,785	1,126,704	995,047
Insurance-Domestic | Short-tail Lines [Member]
Segment Reporting Information [Line Items]
Net premiums earned	925,468	875,898	774,809
Insurance-Domestic | Commercial Automobile [Member]
Segment Reporting Information [Line Items]
Net premiums earned	548,450	526,344	486,759
Insurance-Domestic | Professional Liability
Segment Reporting Information [Line Items]
Net premiums earned	369,499	293,562	266,425
Insurance-International
Segment Reporting Information [Line Items]
Net premiums earned	772,141	802,375	723,151
Insurance-International | Other Liability [Member]
Segment Reporting Information [Line Items]
Net premiums earned	103,974	92,411	65,528
Insurance-International | Workers' Compensation [Member]
Segment Reporting Information [Line Items]
Net premiums earned	93,728	71,997	84,637
Insurance-International | Short-tail Lines [Member]
Segment Reporting Information [Line Items]
Net premiums earned	373,415	415,123	336,814
Insurance-International | Commercial Automobile [Member]
Segment Reporting Information [Line Items]
Net premiums earned	125,628	116,369	130,020
Insurance-International | Professional Liability
Segment Reporting Information [Line Items]
Net premiums earned	75,396	106,475	106,152
Reinsurance-Global
Segment Reporting Information [Line Items]
Net premiums earned	609,109	670,110	720,970
Reinsurance-Global | Casualty [Member]
Segment Reporting Information [Line Items]
Net premiums earned	421,811	487,264	507,790
Reinsurance-Global | Property [Member]
Segment Reporting Information [Line Items]
Net premiums earned	$ 187,298	$ 182,846	$ 213,180

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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, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 1,811,056	$ 1,860,957	$ 1,789,765	$ 1,744,679	$ 1,784,428		$ 1,840,605		$ 1,796,989		$ 1,706,906		$ 7,206,457	$ 7,128,928	$ 6,408,534
Net income	$ 109,745	$ 152,607	$ 123,035	$ 118,307	$ 110,711		$ 188,539		$ 179,961		$ 169,673		$ 503,694	$ 648,884	$ 499,925
Net income per share
Basic (dollars per share)	$ 0.89	$ 1.24	$ 0.99	$ 0.94	$ 0.87	[1]	$ 1.48	[1]	$ 1.41	[1]	$ 1.31	[1]	$ 4.06	$ 5.07	$ 3.69
Diluted (dollars per share)	$ 0.85	$ 1.18	$ 0.95	$ 0.89	$ 0.83	[1]	$ 1.42	[1]	$ 1.35	[1]	$ 1.25	[1]	$ 3.87	$ 4.86	$ 3.55

[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.

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Schedule II - Condensed Financial Information of Registrant (Balance Sheets (Parent Company)) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 30, 2011
Assets:
Cash and cash equivalents	$ 763,631	$ 674,441	$ 839,738	$ 905,670
Fixed maturity securities available for sale at fair value (cost $201,256 and $272,283 at December 31, 2015 and 2014, respectively)	12,444,394	12,705,160
Equity securities available for sale, at fair value (cost $3,430 in 2015 and $3,738 in 2014)	150,866	170,991
Current Federal income taxes	55,763	67,623
Property, furniture and equipment at cost, less accumulated depreciation	348,224	332,098
Other assets	442,782	369,558
Total assets	21,730,967	21,716,691
Liabilities:
Other liabilities	837,937	859,736
Deferred Federal income taxes	6,811	37,452
Subordinated debentures	340,320	340,060
Total liabilities	17,097,759	17,092,557
Stockholders' equity:
Preferred stock	0	0
Common stock	47,024	47,024
Additional paid-in capital	1,005,455	991,512
Retained earnings (including accumulated undistributed net income of subsidiaries of $4,746,934 and $4,700,821 at December 31, 2015 and 2014, respectively)	6,178,070	5,732,410
Accumulated other comprehensive income (loss)	(66,698)	183,550
Treasury stock, at cost	(2,563,605)	(2,364,551)
Total common stockholders’ equity	4,600,246	4,589,945
Total liabilities and equity	21,730,967	21,716,691
Fixed maturity securities available for sale at cost	12,012,041	12,122,087
Equity securities available for sale at cost	165,192	160,295
Parent Company
Assets:
Cash and cash equivalents	195,658	90,693	$ 17,315		$ 162,972
Fixed maturity securities available for sale at fair value (cost $201,256 and $272,283 at December 31, 2015 and 2014, respectively)	201,738	273,773
Equity securities available for sale, at fair value (cost $3,430 in 2015 and $3,738 in 2014)	3,430	3,738
Investment in subsidiaries	6,454,065	6,693,731
Deferred Federal income taxes	37,135	0
Current Federal income taxes	51,512	62,882
Property, furniture and equipment at cost, less accumulated depreciation	13,150	9,852
Other assets	6,153	6,978
Total assets	6,962,841	7,141,647
Liabilities:
Due to subsidiaries	143,669	87,540
Other liabilities	115,737	162,648
Current Federal income taxes	0
Deferred Federal income taxes		149
Subordinated debentures	340,320	340,060
Senior notes	1,762,869	1,961,305
Total liabilities	2,362,595	2,551,702
Stockholders' equity:
Preferred stock	0	0
Common stock	47,024	47,024
Additional paid-in capital	1,005,455	991,512
Retained earnings (including accumulated undistributed net income of subsidiaries of $4,746,934 and $4,700,821 at December 31, 2015 and 2014, respectively)	6,178,070	5,732,410
Accumulated other comprehensive income (loss)	(66,698)	183,550
Treasury stock, at cost	(2,563,605)	(2,364,551)
Total common stockholders’ equity	4,600,246	4,589,945
Total liabilities and equity	6,962,841	7,141,647
Fixed maturity securities available for sale at cost	201,256	272,283
Equity securities available for sale at cost	3,430	3,738
Accumulated undistributed net income of subsidiaries	$ 4,746,934	$ 4,700,821

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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, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Condensed Income Statements, Captions [Line Items]
Other income									$ 337	$ 1,308	$ 1,026
Total revenues	$ 1,811,056	$ 1,860,957	$ 1,789,765	$ 1,744,679	$ 1,784,428	$ 1,840,605	$ 1,796,989	$ 1,706,906	7,206,457	7,128,928	6,408,534
Operating costs and expense									6,474,427	6,176,732	5,709,646
Income before income taxes									732,030	952,196	698,888
Federal income taxes:
Net expense									(227,923)	(302,593)	(193,587)
Net income to common stockholders	$ 109,745	$ 152,607	$ 123,035	$ 118,307	$ 110,711	$ 188,539	$ 179,961	$ 169,673	503,694	648,884	499,925
Dividends from subsidiaries									642,421	503,483	269,626
Parent Company
Condensed Income Statements, Captions [Line Items]
Management fees and investment income including dividends from subsidiaries of $642,421, $503,483, and $269,626 for the years ended December 31, 2015, 2014 and 2013, respectively									655,318	515,775	277,223
Net investment gains									696	5,487	24,550
Other income									348	450	223
Total revenues									656,362	521,712	301,996
Operating costs and expense									143,391	148,288	122,562
Interest expense									128,248	125,352	120,066
Income before income taxes									384,723	248,072	59,368
Federal income taxes:
Federal income taxes provided by subsidiaries on a separate return basis									272,180	366,721	225,845
Federal income tax expense on a consolidated return basis									(199,322)	(273,310)	(154,928)
Net expense									72,858	93,411	70,917
Income before undistributed equity in net income of subsidiaries									457,581	341,483	130,285
Equity in undistributed net income of subsidiaries									46,113	307,401	369,640
Net income to common stockholders									$ 503,694	$ 648,884	$ 499,925

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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, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Condensed Cash Flow Statements, Captions [Line Items]
Fixed maturity securities available for sale at fair value (cost $201,256 and $272,283 at December 31, 2015 and 2014, respectively)	$ 12,444,394				$ 12,705,160				$ 12,444,394	$ 12,705,160
Cash flows from operating activities:
Net income	109,745	$ 152,607	$ 123,035	$ 118,307	110,711	$ 188,539	$ 179,961	$ 169,673	503,694	648,884	$ 499,925
Adjustments to reconcile net income to net cash from operating activities:
Net investment gains									(92,324)	(254,852)	(121,544)
Depreciation and amortization									85,139	88,836	103,090
Stock incentive plans									32,123	28,068	23,784
Change in:
Other liabilities									(63,680)	(58,254)	42,787
Net cash from operating activities									881,304	734,847	819,798
Cash from (used in) investing activities:
Proceeds from sale of fixed maturity securities									1,388,680	633,459	1,344,707
Proceeds from maturities and prepayments of fixed maturity securities									2,999,339	2,605,839	2,718,156
Proceeds from sales of equity securities									15,833	113,251	267,554
Cost of purchases of fixed maturity securities									(4,455,223)	(4,292,165)	(4,198,135)
Payments to Acquire Available-for-sale Securities, Equity									(29,526)	(31,207)	(156,557)
Payments to Acquire Businesses, Net of Cash Acquired									(7,312)	(65,421)	(56,878)
Change in balance due to security broker									(22,666)	32,617	(26,155)
Net additions to real estate, furniture & equipment									(63,562)	(41,958)	(63,150)
Net cash used in investing activities									(170,763)	(808,311)	(545,364)
Cash from (used in) financing activities:
Net proceeds from stock options exercised									0	0	53
Purchase of common treasury shares									(223,652)	(238,933)	(166,473)
Cash dividends to common stockholders									(58,034)	(181,489)	(52,717)
Net cash used in financing activities									(555,318)	(69,773)	(330,262)
Net increase (decrease) in cash and cash equivalents									89,190	(165,297)	(65,932)
Cash and cash equivalents at beginning of year				674,441				839,738	674,441	839,738	905,670
Cash and cash equivalents at end of year	763,631				674,441				763,631	674,441	839,738
Parent Company
Condensed Cash Flow Statements, Captions [Line Items]
Fixed maturity securities available for sale at fair value (cost $201,256 and $272,283 at December 31, 2015 and 2014, respectively)	201,738				273,773				201,738	273,773
Cash flows from operating activities:
Net income									503,694	648,884	499,925
Adjustments to reconcile net income to net cash from operating activities:
Net investment gains									(696)	(5,487)	(24,550)
Depreciation and amortization									2,693	2,916	10,397
Equity in undistributed earnings of subsidiaries									(46,113)	(307,401)	(369,640)
Tax payments received from subsidiaries									311,482	462,809	77,305
Federal income taxes provided by subsidiaries on a separate return basis									(272,180)	(366,721)	(225,845)
Stock incentive plans									29,725	28,068	23,784
Change in:
Federal income taxes									51,772	(15,239)	21,866
Other assets									301	(364)	(821)
Other liabilities									(92,752)	(39,780)	(15,470)
Accrued investment income									524	(820)	967
Net cash from operating activities									488,450	406,865	(2,082)
Cash from (used in) investing activities:
Proceeds from sale of fixed maturity securities									380,986	289,683	230,854
Proceeds from maturities and prepayments of fixed maturity securities									123,639	103,646	68,918
Proceeds from sales of equity securities									308	7,356	23,395
Cost of purchases of fixed maturity securities									(432,645)	(605,768)	(79,132)
Payments to Acquire Available-for-sale Securities, Equity									0	0	(4,668)
Payments to Acquire Businesses, Net of Cash Acquired									0	(82,879)	0
Investments in and advances to subsidiaries, net									30,338	34,191	(58,454)
Change in balance due to security broker									0	(2,151)	6,918
Net additions to real estate, furniture & equipment									(4,425)	(1,615)	(1,896)
Net cash used in investing activities									98,201	(257,537)	185,935
Cash from (used in) financing activities:
Net proceeds from issuance of senior notes									0	344,472	339,627
Net proceeds from stock options exercised									0	0	53
Repayment of senior notes									(200,000)	0	(450,000)
Purchase of common treasury shares									(223,652)	(238,933)	(166,473)
Cash dividends to common stockholders									(58,034)	(181,489)	(52,717)
Net cash used in financing activities									(481,686)	(75,950)	(329,510)
Net increase (decrease) in cash and cash equivalents									104,965	73,378	(145,657)
Cash and cash equivalents at beginning of year				$ 90,693				$ 17,315	90,693	17,315
Cash and cash equivalents at end of year	$ 195,658				$ 90,693				$ 195,658	$ 90,693	$ 17,315

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Schedule III - Supplementary Insurance Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Supplementary Insurance Information, by Segment [Line Items]
Deferred Policy Acquisition Cost	$ 513,128	$ 488,525	$ 452,101
Reserve for Losses and Loss Expenses	10,669,150	10,369,701	10,080,941
Unearned Premiums	3,137,133	3,026,732	2,781,437
Net Premiums Earned	6,040,609	5,744,418	5,226,537
Net Investment Income	512,645	600,885	544,291
Loss and Loss Expenses	3,656,270	3,490,567	3,197,024
Amortization of Deferred Policy Acquisition Cost	1,102,492	1,053,397	991,070
Other Operating Cost and Expenses	1,187,258	1,104,059	1,009,614
Net Premiums Written	6,189,515	5,996,947	5,500,173
Operating Segments | Insurance-Domestic
Supplementary Insurance Information, by Segment [Line Items]
Deferred Policy Acquisition Cost	367,977	347,261	306,464
Reserve for Losses and Loss Expenses	8,450,190	8,000,863	7,715,124
Unearned Premiums	2,529,931	2,384,511	2,107,768
Net Premiums Earned	4,659,359	4,271,933	3,782,416
Net Investment Income	358,935	428,632	404,280
Loss and Loss Expenses	2,851,136	2,571,010	2,318,541
Amortization of Deferred Policy Acquisition Cost	760,020	710,141	651,524
Other Operating Cost and Expenses	778,957	729,958	671,096
Net Premiums Written	4,812,830	4,517,587	3,994,387
Operating Segments | Insurance-International
Supplementary Insurance Information, by Segment [Line Items]
Deferred Policy Acquisition Cost	62,687	60,900	60,751
Reserve for Losses and Loss Expenses	798,116	855,852	672,009
Unearned Premiums	324,530	342,746	317,691
Net Premiums Earned	772,141	802,375	723,151
Net Investment Income	51,522	55,407	47,039
Loss and Loss Expenses	449,147	503,997	429,900
Amortization of Deferred Policy Acquisition Cost	169,962	173,877	152,843
Other Operating Cost and Expenses	152,629	150,129	124,497
Net Premiums Written	778,567	828,076	756,185
Operating Segments | Reinsurance-Global
Supplementary Insurance Information, by Segment [Line Items]
Deferred Policy Acquisition Cost	82,464	80,364	84,886
Reserve for Losses and Loss Expenses	1,420,844	1,512,986	1,693,808
Unearned Premiums	282,672	299,475	355,978
Net Premiums Earned	609,109	670,110	720,970
Net Investment Income	74,226	88,821	89,090
Loss and Loss Expenses	355,987	415,560	448,583
Amortization of Deferred Policy Acquisition Cost	172,510	169,379	186,703
Other Operating Cost and Expenses	59,986	58,315	64,567
Net Premiums Written	598,118	651,284	749,601
Corporate and adjustments
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	27,962	28,025	3,882
Loss and Loss Expenses	0	0	0
Amortization of Deferred Policy Acquisition Cost	0	0	0
Other Operating Cost and Expenses	195,686	$ 165,657	$ 149,454
Net Premiums Written	$ 0

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Schedule IV - Reinsurance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Direct Amount	$ 6,412,533	$ 6,185,242	$ 5,626,172
Ceded to Other Companies	1,060,478	1,065,891	1,010,918
Assumed from Other Companies	837,460	877,596	884,919
Total net premiums written	$ 6,189,515	$ 5,996,947	$ 5,500,173
Percentage of Amount Assumed to Net	13.50%	14.60%	16.10%
Insurance-Domestic
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Direct Amount	$ 5,521,447	$ 5,214,849	$ 4,699,348
Ceded to Other Companies	871,358	866,092	809,368
Assumed from Other Companies	162,741	168,830	104,407
Total net premiums written	$ 4,812,830	$ 4,517,587	$ 3,994,387
Percentage of Amount Assumed to Net	3.40%	3.70%	2.60%
Insurance-International
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Direct Amount	$ 874,359	$ 927,799	$ 887,027
Ceded to Other Companies	144,737	156,195	142,591
Assumed from Other Companies	48,945	56,472	11,749
Total net premiums written	$ 778,567	$ 828,076	$ 756,185
Percentage of Amount Assumed to Net	6.30%	6.80%	1.60%
Reinsurance-Global
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Direct Amount	$ 16,727	$ 42,594	$ 39,797
Ceded to Other Companies	44,383	43,604	58,959
Assumed from Other Companies	625,774	652,294	768,763
Total net premiums written	$ 598,118	$ 651,284	$ 749,601
Percentage of Amount Assumed to Net	104.60%	100.20%	102.60%

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Schedule V - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Movement in Valuation Allowances and Reserves [Roll Forward]
Opening Balance	$ 26,411	$ 24,423	$ 30,219
Additions - Charged to Expense	8,567	7,979	3,627
Deductions - Amounts Written Off	(5,303)	(5,991)	(9,423)
Ending Balance	29,675	26,411	24,423
Premiums and fees receivable
Movement in Valuation Allowances and Reserves [Roll Forward]
Opening Balance	21,446	20,951	22,919
Additions - Charged to Expense	6,281	5,944	3,133
Deductions - Amounts Written Off	(5,203)	(5,449)	(5,101)
Ending Balance	22,524	21,446	20,951
Due from reinsurers
Movement in Valuation Allowances and Reserves [Roll Forward]
Opening Balance	1,144	1,385	1,680
Additions - Charged to Expense	(24)	301	186
Deductions - Amounts Written Off	(100)	(542)	(481)
Ending Balance	1,020	1,144	1,385
Deferred federal and foreign income taxes
Movement in Valuation Allowances and Reserves [Roll Forward]
Opening Balance	1,335	0
Additions - Charged to Expense	2,702	1,335
Deductions - Amounts Written Off	0	0
Ending Balance	4,037	1,335	0
Loan loss reserves
Movement in Valuation Allowances and Reserves [Roll Forward]
Opening Balance	2,486	2,087	5,620
Additions - Charged to Expense	(392)	399	308
Deductions - Amounts Written Off	0	0	(3,841)
Ending Balance	$ 2,094	$ 2,486	$ 2,087

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Schedule VI - Supplementary Information Concerning Property-Casualty Insurance Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014		Dec. 31, 2013
Supplemental Information for Property, Casualty Insurance Underwriters [Abstract]
Deferred policy acquisition costs	$ 513,128	$ 488,525		$ 452,101
Reserves for losses and loss expenses	10,669,150	10,369,701		10,080,941
Unearned premium	3,137,133	3,026,732		2,781,437
Net premiums earned	6,040,609	5,744,418		5,226,537
Net investment income	512,645	600,885		544,291
Losses and loss expenses incurred:
Current year	3,653,561	3,495,825	[1]	3,221,393	[1]
Prior years	(46,713)	(75,764)		(78,810)
Loss reserve discount accretion	49,422	70,506		54,441
Amortization of deferred policy acquisition costs	1,102,492	1,053,397		991,070
Paid losses and loss expenses	3,257,015	3,115,227		2,878,071
Net premiums written	$ 6,189,515	$ 5,996,947		$ 5,500,173

[1] Claims occurring during the current year are net of loss reserve discounts of $20,357,000, $21,306,000, and $22,680,000 in 2015, 2014 and 2013, respectively.

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Label	Element	Value
Proceeds from Divestiture of Businesses, Net of Cash Divested	us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested	$ 0