10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 10-Q

(Mark one)

þ QUARTERLY REPORT PURSUANT TO SECTION 13 or 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the Quarterly Period Ended March 31, 2016

or

o 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	(I.R.S. Employer
incorporation or organization)	Identification No.)
475 Steamboat Road, Greenwich, Connecticut	06830
(Address of principal executive offices)	(Zip Code)

	(203) 629-3000
	(Registrant’s telephone number, including area code)
	None
Former name, former address and former fiscal year, if changed since last report.

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 þ     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 (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes þ     No o

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

Large accelerated filer þ	Accelerated filer o	Non-accelerated filer o	Smaller reporting company o
		(Do not check if a smaller reporting company)

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

Number of shares of common stock, $.20 par value, outstanding as of May 4, 2016: 122,602,882

TABLE OF CONTENTS

Part I — FINANCIAL INFORMATION
	Item 1. Financial Statements
	Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations
	Item 3. Quantitative and Qualitative Disclosure About Market Risk
	Item 4. Controls and Procedures
PART II — OTHER INFORMATION
	Item 1. Legal Proceedings
	Item 1A. Risk Factors
	Item 2. Unregistered Sales of Equity Securities and Use of Proceeds
	Item 6. Exhibits
SIGNATURES
EX-10.1
EX-31.1
EX-31.2
EX-32.1
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

Part I — FINANCIAL INFORMATION

Item 1. Financial Statements

W. R. BERKLEY CORPORATION AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

(In thousands, except share data)

	March 31, 2016			December 31, 2015
	(Unaudited)			(Audited)
Assets
Investments:
Fixed maturity securities	$	12,745,436		$	12,444,394
Investment funds	1,179,310			1,170,040
Real estate	986,810			936,367
Arbitrage trading account	384,519			376,697
Loans receivable	149,388			273,103
Equity securities	141,699			150,866
Total investments	15,587,162			15,351,467
Cash and cash equivalents	837,515			763,631
Premiums and fees receivable	1,749,273			1,669,186
Due from reinsurers	1,558,749			1,532,829
Deferred policy acquisition costs	547,519			513,128
Prepaid reinsurance premiums	429,058			394,387
Trading account receivables from brokers and clearing organizations	373,833			383,115
Property, furniture and equipment	346,471			348,224
Goodwill	153,747			153,291
Accrued investment income	130,380			123,164
Federal and foreign income taxes	—			48,952
Other assets	517,227			442,782
Total assets	$	22,230,934		$	21,724,156
Liabilities and Equity
Liabilities:
Reserves for losses and loss expenses	$	10,788,342		$	10,669,150
Unearned premiums	3,314,676			3,137,133
Due to reinsurers	256,838			224,752
Trading account securities sold but not yet purchased	35,956			37,035
Federal and foreign income taxes	31,291			—
Other liabilities	754,292			837,937
Senior notes and other debt	1,814,998			1,844,621
Subordinated debentures	446,485			340,320
Total liabilities	17,442,878			17,090,948
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, 122,599,552 and 123,307,837 shares, respectively	47,024			47,024
Additional paid-in capital	1,013,572			1,005,455
Retained earnings	6,282,870			6,178,070
Accumulated other comprehensive income (loss)	8,124			(66,698		)
Treasury stock, at cost, 112,518,366 and 111,810,081 shares, respectively	(2,600,377		)	(2,563,605		)
Total stockholders’ equity	4,751,213			4,600,246
Noncontrolling interests	36,843			32,962
Total equity	4,788,056			4,633,208
Total liabilities and equity	$	22,230,934		$	21,724,156

See accompanying notes to interim consolidated financial statements.

1

W. R. BERKLEY CORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED)

(In thousands, except per share data)

	For the Three Months
	Ended March 31,
	2016			2015
REVENUES:
Net premiums written	$	1,663,722		$	1,575,402
Change in net unearned premiums	(136,387		)	(103,389		)
Net premiums earned	1,527,335			1,472,013
Net investment income	130,133			124,239
Insurance service fees	40,362			36,518
Net realized investment gains	25,457			19,044
Other-than-temporary impairments	(18,114		)	—
Revenues from non-insurance businesses	101,780			92,606
Other income	258			259
Total revenues	1,807,211			1,744,679
OPERATING COSTS AND EXPENSES:
Losses and loss expenses	922,321			900,708
Other operating costs and expenses	582,459			551,046
Expenses from non-insurance businesses	95,531			89,670
Interest expense	32,224			34,538
Total operating costs and expenses	1,632,535			1,575,962
Income before income taxes	174,676			168,717
Income tax expense	(54,428		)	(50,273		)
Net income before noncontrolling interests	120,248			118,444
Noncontrolling interests	(737		)	(137		)
Net income to common stockholders	$	119,511		$	118,307
NET INCOME PER SHARE:
Basic	$	0.97		$	0.94
Diluted	$	0.93		$	0.89

See accompanying notes to interim consolidated financial statements.

2

W. R. BERKLEY CORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED)

(In thousands)

	For the Three Months
	Ended March 31,
	2016			2015
Net income before noncontrolling interests	$	120,248		$	118,444
Other comprehensive income (loss):
Change in unrealized currency translation adjustments	(2,047		)	(47,805		)
Change in unrealized investment gains, net of taxes	76,855			16,291
Other comprehensive income (loss)	74,808			(31,514		)
Comprehensive income	195,056			86,930
Comprehensive (income) to the noncontrolling interest	(723		)	(115		)
Comprehensive income to common stockholders	$	194,333		$	86,815

See accompanying notes to interim consolidated financial statements.

3

W. R. BERKLEY CORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY (UNAUDITED)

(In thousands)

	For the Three Months
	Ended March 31,
	2016			2015
COMMON STOCK:
Beginning and end of period	$	47,024		$	47,024
ADDITIONAL PAID-IN CAPITAL:
Beginning of period	$	1,005,455		$	991,512
Stock options exercised and restricted stock units issued including tax benefit	(652		)	(1,678		)
Restricted stock units expensed	8,769			8,171
End of period	$	1,013,572		$	998,005
RETAINED EARNINGS:
Beginning of period	$	6,178,070		$	5,732,410
Net income to common stockholders	119,511			118,307
Dividends	(14,711		)	(13,749		)
End of period	$	6,282,870		$	5,836,968
ACCUMULATED OTHER COMPREHENSIVE INCOME:
Unrealized investment gains:
Beginning of period	$	180,695		$	306,199
Unrealized gains on securities not other-than-temporarily impaired	76,904			16,308
Unrealized gains (losses) on other-than-temporarily impaired securities	(35		)	5
End of period	257,564			322,512
Currency translation adjustments:
Beginning of period	$	(247,393	)	$	(122,649	)
Net change in period	(2,047		)	(47,805		)
End of period	(249,440		)	(170,454		)
Total accumulated other comprehensive income	$	8,124		$	152,058
TREASURY STOCK:
Beginning of period	$	(2,563,605	)	$	(2,364,551	)
Stock exercised/vested	652			331
Stock repurchased	(37,424		)	(91,213		)
End of period	$	(2,600,377	)	$	(2,455,433	)
NONCONTROLLING INTERESTS:
Beginning of period	$	32,962		$	34,189
Contributions	3,158			111
Net income	737			137
Other comprehensive (loss), net of tax	(14		)	(22		)
End of period	$	36,843		$	34,415

See accompanying notes to interim consolidated financial statements.

4

W. R. BERKLEY CORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED)

(In thousands)

	For the Three Months
	Ended March 31,
	2016			2015
CASH FROM OPERATING ACTIVITIES:
Net income to common stockholders	$	119,511		$	118,307
Adjustments to reconcile net income to net cash from operating activities:
Net investment gains	(7,343		)	(19,044		)
Depreciation and amortization	30,245			19,203
Noncontrolling interests	737			137
Investment funds	(16,636		)	(6,061		)
Stock incentive plans	8,766			8,171
Change in:
Arbitrage trading account	383			7,692
Premiums and fees receivable	(79,531		)	(71,181		)
Reinsurance accounts	(26,319		)	(46,260		)
Deferred policy acquisition costs	(33,466		)	(21,314		)
Income taxes	46,780			44,618
Reserves for losses and loss expenses	108,057			152,925
Unearned premiums	171,553			117,403
Other	(181,969		)	(243,584		)
Net cash from operating activities	140,768			61,012
CASH FROM (USED IN) INVESTING ACTIVITIES:
Proceeds from sale of fixed maturity securities	381,732			466,276
Proceeds from sale of equity securities	1,880			9,785
Distributions from investment funds	15,788			(9,363		)
Proceeds from maturities and prepayments of fixed maturity securities	455,463			655,349
Purchase of fixed maturity securities	(1,032,129		)	(1,094,439		)
Purchase of equity securities	(1,108		)	(8,882		)
Real estate purchased	(53,781		)	(44,162		)
Change in loans receivable	123,737			41,244
Net additions to property, furniture and equipment	(12,461		)	(7,680		)
Change in balances due to security brokers	69,642			(2,652		)
Payment for business purchased net of cash aquired	(54,313		)	—
Net cash from (used in) investing activities	(105,550		)	5,476
CASH FROM (USED IN) FINANCING ACTIVITIES:
Repayment of senior notes and other debt	(33,721		)	(3,240		)
Net proceeds from issuance of debt	110,093			—
Cash dividends to common stockholders	(14,711		)	(13,749		)
Purchase of common treasury shares	(37,424		)	(91,213		)
Other, net	3,158			(1,187		)
Net cash from (used in) financing activities	27,395			(109,389		)
Net impact on cash due to change in foreign exchange rates	11,271			(16,845		)
Net increase (decrease) in cash and cash equivalents	73,884			(59,746		)
Cash and cash equivalents at beginning of year	763,631			674,441
Cash and cash equivalents at end of period	$	837,515		$	614,695

See accompanying notes to interim consolidated financial statements.

5

W. R. Berkley Corporation and Subsidiaries

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

(1) General

The unaudited 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”) for interim financial information. Accordingly, they do not include all the information and notes required by GAAP for annual financial statements. The unaudited consolidated financial statements reflect all adjustments, consisting only of normal recurring items, which are necessary to present fairly the Company’s financial position and results of operations on a basis consistent with the prior audited consolidated financial statements. Operating results for interim periods are not necessarily indicative of the results that may be expected for the year. All significant intercompany accounts and transactions have been eliminated. 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. For further information related to a description of areas of judgment and estimates and other information necessary to understand the Company’s financial position and results of operations, refer to the audited consolidated financial statements and notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2015. Reclassifications have been made in the 2015 financial statements as originally reported to conform to the presentation of the 2016 financial statements.

The income tax provision has been computed based on the Company’s estimated annual effective tax rate. The effective tax rate for the quarter differs from the federal income tax rate of 35% principally because of tax-exempt investment income.

(2) 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 the weighted average number of common shares outstanding during the period. Diluted EPS is based upon the weighted average number of common and common equivalent shares outstanding during the period 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.

The weighted average number of common shares used in the computation of basic and diluted earnings per share was as follows:

	For the Three Months
	Ended March 31,
(In thousands)	2016	2015
Basic	122,780	125,969
Diluted	128,529	132,484

(3) Recent Accounting Pronouncements

In February 2015, the Financial Accounting Standards Board ("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 Company adopted this updated guidance on January 1, 2016. This adoption did not have a material effect on the Company's financial condition or results of operations, but did 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 are disclosure only, the adoption of this guidance will not impact our financial condition or results of operations.

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.

6

(4) Acquisitions/Dispositions

In February 2016, the Company acquired an 85% ownership interest for $42.3 million in a company engaged in the distribution of promotional merchandise. The fair value of the assets acquired and liabilities assumed have been estimated based on a preliminary valuation. The fair values of the assets and liabilities will be adjusted, as needed, following completion of the final valuation.

The following table summarizes the initial estimated fair value of net assets acquired and liabilities assumed for the business combination completed in 2016:

(In thousands)	2016
Cash and cash equivalents	$	1,072
Real estate, furniture and equipment	701
Goodwill and other intangibles assets	40,282
Premiums and service fees receivable	3,845
Other assets	5,166
Total assets acquired	51,066
Other liabilities assumed	(4,931		)
Noncontrolling interest	(3,850		)
Net assets acquired	$	42,285

7

(5) Consolidated Statement of Comprehensive Income (Loss)

The following table presents the components of the changes in accumulated other comprehensive income (loss) ("AOCI"):

(In thousands)	Unrealized Investment Gains (Losses)				Currency Translation Adjustments			Accumulated Other Comprehensive Income (Loss)
As of and for the three months ended March 31, 2016:
Changes in AOCI
Beginning of period	$	180,695			$	(247,393	)	$	(66,698	)
Other comprehensive income (loss) before reclassifications	78,242				(2,047		)	76,195
Amounts reclassified from AOCI	(1,387		)		—			(1,387		)
Other comprehensive income (loss)	76,855				(2,047		)	74,808
Unrealized investment gain related to non-controlling interest	14				—			14
End of period	$	257,564			$	(249,440	)	$	8,124
Amounts reclassified from AOCI
Pre-tax	$	(2,134	)	(1)	$	—		$	(2,134	)
Tax effect	747			(2)	—			747
After-tax amounts reclassified	$	(1,387	)		$	—		$	(1,387	)
Other comprehensive income (loss)
Pre-tax	$	114,390			$	(2,047	)	$	112,343
Tax effect	(37,535		)		—			(37,535		)
Other comprehensive income (loss)	$	76,855			$	(2,047	)	$	74,808
As of and for the three months ended March 31, 2015:
Changes in AOCI
Beginning of period	$	306,199			$	(122,649	)	$	183,550
Other comprehensive income (loss) before reclassifications	24,592				(47,805		)	(23,213		)
Amounts reclassified from AOCI	(8,301		)		—			(8,301		)
Other comprehensive income (loss)	16,291				(47,805		)	(31,514		)
Unrealized investment gain related to non-controlling interest	22				—			22
End of period	$	322,512			$	(170,454	)	$	152,058
Amounts reclassified from AOCI
Pre-tax	$	(12,771	)	(1)	$	—		$	(12,771	)
Tax effect	4,470			(2)	—			4,470
After-tax amounts reclassified	$	(8,301	)		$	—		$	(8,301	)
Other comprehensive income (loss)
Pre-tax	$	24,536			$	(47,805	)	$	(23,269	)
Tax effect	(8,245		)		—			(8,245		)
Other comprehensive income (loss)	$	16,291			$	(47,805	)	$	(31,514	)

_______________

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

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

8

(6) Statements of Cash Flow

Interest payments were $56,968,000 and $56,632,000 and income taxes paid were $5,644,000 and $4,769,000 in the three months ended March 31, 2016 and 2015, respectively.

(7) Investments in Fixed Maturity Securities

At March 31, 2016 and December 31, 2015, investments in fixed maturity securities were as follows:

(In thousands)	Amortized Cost		Gross Unrealized					Fair Value		Carrying Value
			Gains		Losses
March 31, 2016
Held to maturity:
State and municipal	$	78,264	$	17,340	$	—		$	95,604	$	78,264
Residential mortgage-backed	18,405		2,470		—			20,875		18,405
Total held to maturity	96,669		19,810		—			116,479		96,669
Available for sale:
U.S. government and government agency	571,330		27,602		(981		)	597,951		597,951
State and municipal:
Special revenue	2,613,723		120,174		(2,047		)	2,731,850		2,731,850
State general obligation	595,465		30,624		(1,817		)	624,272		624,272
Pre-refunded	407,586		32,630		—			440,216		440,216
Corporate backed	388,408		15,034		(618		)	402,824		402,824
Local general obligation	356,266		29,357		(17		)	385,606		385,606
Total state and municipal	4,361,448		227,819		(4,499		)	4,584,768		4,584,768
Mortgage-backed securities:
Residential (1)	1,067,877		27,520		(5,548		)	1,089,849		1,089,849
Commercial	65,138		778		(616		)	65,300		65,300
Total mortgage-backed securities	1,133,015		28,298		(6,164		)	1,155,149		1,155,149
Asset-backed	1,855,301		11,949		(22,846		)	1,844,404		1,844,404
Corporate:
Industrial	2,007,460		106,650		(20,538		)	2,093,572		2,093,572
Financial	1,176,238		39,566		(13,664		)	1,202,140		1,202,140
Utilities	197,336		10,771		(1,958		)	206,149		206,149
Other	66,289		426		—			66,715		66,715
Total corporate	3,447,323		157,413		(36,160		)	3,568,576		3,568,576
Foreign	849,800		54,580		(6,461		)	897,919		897,919
Total available for sale	12,218,217		507,661		(77,111		)	12,648,767		12,648,767
Total investments in fixed maturity securities	$	12,314,886	$	527,471	$	(77,111	)	$	12,765,246	$	12,745,436

9

(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
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	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

____________

(1) Gross unrealized losses for residential mortgage-backed securities include $1,324,214 and $1,269,491 as of March 31, 2016 and December 31, 2015, respectively, related to the non-credit portion of other-than-temporary impairments (“OTTI”) recognized in accumulated other comprehensive income.

The amortized cost and fair value of fixed maturity securities at March 31, 2016, 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	$	812,491	$	822,851
Due after one year through five years	4,360,294		4,522,431
Due after five years through ten years	3,482,275		3,659,124
Due after ten years	2,508,406		2,584,816
Mortgage-backed securities	1,151,420		1,176,024
Total	$	12,314,886	$	12,765,246

At March 31, 2016 and 2015, there were no investments that exceeded 10% of common stockholder's equity, other than investments in United States government and government agency securities.

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(8) Investments in Equity Securities Available for Sale

At March 31, 2016 and December 31, 2015, investments in equity securities were as follows:

(In thousands)	Cost		Gross Unrealized					Fair Value		Carrying Value
			Gains		Losses
March 31, 2016
Common stocks	$	38,686	$	424	$	(1,539	)	$	37,571	$	37,571
Preferred stocks	106,990		7,582		(10,444		)	104,128		104,128
Total	$	145,676	$	8,006	$	(11,983	)	$	141,699	$	141,699
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

(9) Arbitrage Trading Account

At March 31, 2016 and December 31, 2015, the fair and carrying values of the arbitrage trading account were $385 million and $377 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 March 31, 2016, the fair value of long option contracts outstanding was $0.5 million (notional amount of $6.7 million) and the fair value of short option contracts outstanding was $0.4 million (notional amount of $12.7 million). Other than with respect to the use of these trading account securities, the Company does not make use of derivatives.

(10) Net Investment Income

Net investment income consists of the following:

	For the Three Months
	Ended March 31,
(In thousands)	2016			2015
Investment income earned on:
Fixed maturity securities, including cash and cash equivalents and loans receivable	$	108,835		$	108,129
Investment funds	16,636			6,061
Arbitrage trading account	3,190			8,979
Equity securities available for sale	868			1,180
Real estate	2,717			2,767
Gross investment income	132,246			127,116
Investment expense	(2,113		)	(2,877		)
Net investment income	$	130,133		$	124,239

(11) Investment Funds

The Company evaluates whether it is an investor in a variable interest entities (VIE).  Such entities do not have sufficient equity at risk to finance their activities without additional subordinated financial support, or the equity investors, as a group, do not have the characteristics of a controlling financial interest (primary beneficiary).  The Company determines whether it is the

11

primary beneficiary of an entity subject to consolidation based on a qualitative assessment of the VIE's capital structure, contractual terms, nature of the VIE's operations and purpose, and the Company's relative exposure to the related risks of the VIE on the date it becomes initially involved in the VIE and on an ongoing basis.  The Company is not the primary beneficiary in any of its investment funds, and accordingly, carries its interests in investments funds under the equity method of accounting.

The Company’s maximum exposure to loss with respect to these investments is limited to the carrying amount reported on the Company’s consolidated balance sheet and any unfunded commitment.

Investment funds consist of the following:

	Carrying Value as of				Income (Loss) from Investment Funds
	March 31,		December 31,		Three months ended March 31,
(In thousands)	2016		2015		2016			2015
Real estate	$	597,380	$	580,830	$	17,037		$	26,012
Energy	95,849		93,719		(3,924		)	(21,868		)
Hedge equity	67,728		70,580		(2,852		)	(873		)
Other funds	418,353		424,911		6,375			2,790
Total	$	1,179,310	$	1,170,040	$	16,636		$	6,061

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

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 March 31, 2016 is approximately 21% with a fair value of $295.3 million and a carrying value of $46.3 million.

(12) Real Estate

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

	Carrying Value
	March 31,		December 31,
(In thousands)	2016		2015
Properties in operation	$	239,476	$	226,055
Properties under development	747,334		710,312
Total	$	986,810	$	936,367

In 2016, properties in operation included a long-term ground lease in Washington, D.C., a hotel in Memphis, Tennessee and office buildings in West Palm Beach and Palm Beach, Florida. Properties in operation are net of accumulated depreciation and amortization of $10,896,000 and $9,073,000 as of March 31, 2016 and December 31, 2015, respectively. Related depreciation expense was $1,668,000 and $2,543,000 for the three months ended March 31, 2016 and 2015, respectively. Future minimum rental income expected on operating leases relating to properties in operation is $9,614,350 in 2016, $15,791,035 in 2017, $14,793,678 in 2018, $11,822,103 in 2019, $9,830,091 in 2020, $9,591,819 in 2021 and $343,543,992 thereafter.

Properties under development include 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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(13) Loans Receivable

Loans receivable are as follows:

(In thousands)	March 31, 2016		December 31, 2015
Amortized cost (net of valuation allowance):
Real estate loans	$	121,861	$	200,499
Commercial loans	27,527		72,604
Total	$	149,388	$	273,103
Fair value:
Real estate loans	$	124,393	$	201,641
Commercial loans	27,527		74,106
Total	$	151,920	$	275,747
Valuation allowance:
Specific	$	555	$	—
General	2,107		2,094
Total	$	2,662	$	2,094
	2016		2015
Increase (decrease) in valuation allowance	$	568	$	(47	)

Loans receivable in non-accrual status were $6.7 million and $3.1 million as of March 31, 2016 and December 31, 2015, respectively.

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

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

In evaluating the real estate loans, the Company considers their credit quality indicators, including loan to value ratios, which compare the outstanding loan amount to the estimated value of the property, the borrower’s financial condition and performance with respect to loan terms, the position in the capital structure, the overall leverage in the capital structure and other market conditions. Based on these considerations, none of the real estate loans were considered to be impaired at March 31, 2016, and accordingly, the Company determined that a specific valuation allowance was not required.

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(14) Realized and Unrealized Investment Gains (Losses)

Realized and unrealized investment gains (losses) are as follows:

	For the Three Months Ended March 31,
(In thousands)	2016			2015
Realized investment gains (losses):
Fixed maturity securities:
Gains	$	23,064		$	4,146
Losses	(2,940		)	(1,077		)
Equity securities available for sale	125			9,702
Investment funds	(460		)	(1,511		)
Real estate	5,024			—
Other	644			7,784
Net realized gains on investments sales	25,457			19,044
Other-than-temporary impairments (1)	(18,114		)	—
Net investment gains	7,343			19,044
Income tax expense	(2,570		)	(6,665		)
After-tax net realized investment gains	$	4,773		$	12,379

Change in unrealized investment gains and losses of available for sale securities:
Fixed maturity securities	$	92,428		$	42,480
Previously impaired fixed maturity securities	(55		)	8
Equity securities available for sale	13,137			(6,845		)
Investment funds	8,880			(11,107		)
Total change in unrealized investment gains (losses)	114,390			24,536
Income tax benefit (expense)	(37,535		)	(8,245		)
Noncontrolling interests	14			22
After-tax change in unrealized investment gains and losses of available for sale securities	$	76,869		$	16,313

(1) Other than temporary impairments (OTTI) for the three months ended March 31, 2016 were $18.1 million related to common stock.

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(15) Securities in an Unrealized Loss Position

The following tables summarize all securities in an unrealized loss position at March 31, 2016 and December 31, 2015 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
March 31, 2016
U.S. government and government agency	$	24,911	$	79	$	43,226	$	902	$	68,137	$	981
State and municipal	210,419		1,903		171,433		2,596		381,852		4,499
Mortgage-backed securities	135,022		1,748		155,445		4,416		290,467		6,164
Asset-backed securities	1,207,153		14,032		230,979		8,814		1,438,132		22,846
Corporate	362,296		25,162		79,582		10,998		441,878		36,160
Foreign	41,278		3,964		25,672		2,497		66,950		6,461
Fixed maturity securities	1,981,079		46,888		706,337		30,223		2,687,416		77,111
Common stocks	—		—		7,474		1,539		7,474		1,539
Preferred stocks	35,241		6,512		27,657		3,932		62,898		10,444
Equity securities available for sale	35,241		6,512		35,131		5,471		70,372		11,983
Total	$	2,016,320	$	53,400	$	741,468	$	35,694	$	2,757,788	$	89,094
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	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

Fixed Maturity Securities – A summary of the Company’s non-investment grade fixed maturity securities that were in an unrealized loss position at March 31, 2016 is presented in the table below:

($ in thousands)	Number of Securities	Aggregate Fair Value		Gross Unrealized Loss
Mortgage-backed securities	12	$	35,540	$	1,866
Asset-backed securities	7	26,322		261
Corporate	15	92,666		10,780
Foreign government	5	22,414		3,011
Total	39	$	176,942	$	15,918

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

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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 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.

Preferred Stocks– At March 31, 2016, there were five preferred stocks in an unrealized loss position, with an aggregate fair value of $62.9 million and a gross unrealized loss of $10.4 million. Based upon management’s view of the underlying value of these securities, the Company does not consider these equity securities to be OTTI.

Common Stocks - At March 31, 2016, there was one common stock in an unrealized loss position, with a fair value of $7.5 million and a gross unrealized loss of $1.5 million. Based on management's view of the underlying security, the Company does not consider the equity security to be OTTI.

Loans Receivable – The Company monitors the performance of its loans receivable, including current market conditions for each loan and the ability to collect principal and interest. For loans where the Company determines it is probable that the contractual terms will not be met, an analysis is performed and a valuation reserve is established, if necessary, with a charge to earnings. Loans receivable are reported net of a valuation reserve of $3 million and $2 million at March 31, 2016 and December 31, 2015, respectively.

(16)Fair Value Measurements

The Company’s fixed maturity and equity securities classified as available for sale and its trading account securities are carried at fair value. Fair value is defined as “the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date.” The Company utilizes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value into three broad levels, as follows:

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

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

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

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

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

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

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The following tables present the assets and liabilities measured at fair value on a recurring basis as of March 31, 2016 and December 31, 2015 by level:

(In thousands)	Total		Level 1		Level 2		Level 3
March 31, 2016
Assets:
Fixed maturity securities available for sale:
U.S. government and government agency	$	597,951	$	—	$	597,951	$	—
State and municipal	4,584,768		—		4,584,768		—
Mortgage-backed securities	1,155,149		—		1,155,149		—
Asset-backed securities	1,844,404		—		1,844,207		197
Corporate	3,568,576		—		3,568,576		—
Foreign government	897,919		—		897,919		—
Total fixed maturity securities available for sale	12,648,767		—		12,648,570		197
Equity securities available for sale:
Common stocks	37,571		30,097		—		7,474
Preferred stocks	104,128		—		100,488		3,640
Total equity securities available for sale	141,699		30,097		100,488		11,114
Arbitrage trading account	384,519		244,647		139,742		130
Total	$	13,174,985	$	274,744	$	12,888,800	$	11,441
Liabilities:
Trading account securities sold but not yet purchased	$	35,956	$	35,956	$	—	$	—
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	$	—

There were no significant transfers between Levels 1 and 2 during the three months ended March 31, 2016 or during the year ended December 31, 2015.

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The following tables summarize changes in Level 3 assets and liabilities for the three months ended March 31, 2016 and for the year ended December 31, 2015:

	Gains (Losses) Included in:
(In thousands)	Beginning Balance		Earnings (Losses)			Other Comprehensive Income (Loss)			Impairments			Purchases		(Sales)			Paydowns / Maturities			Transfers			Ending Balance
																				In / (Out)
Three months ended March 31, 2016
Assets:
Fixed maturities securities available for sale:
Asset-backed securities	$	199	$	1		$	1		$	—		$	—	$	—		$	(4	)	$	—		$	197
Corporate	154		177			—			—			—		(331		)	—			—			—
Total	353		178			1			—			—		(331		)	(4		)	—			197
Equity securities available for sale:
Common stocks	7,829		—			(355		)	—			—		—			—			—			7,474
Preferred stocks	3,624		16			—			—			—		—			—			—			3,640
Total	11,453		16			(355		)	—			—		—			—			—			11,114
Arbitrage trading account	176		(46		)	—			—			—		—			—			—			130
Total	$	11,982	$	148		$	(354	)	$	—		$	—	$	(331	)	$	(4	)	$	—		$	11,441
Year ended December 31, 2015:
Assets:
Fixed maturities 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

During the three months ended March 31, 2016, there were no transfers out of Level 3. During the year ended December 31, 2015, five securities were transferred out of Level 3 as an observable price became available.

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(17) Fair Value of Financial Instruments

The following table presents the carrying amounts and estimated fair values of the Company’s financial instruments:

	March 31, 2016				December 31, 2015
(In thousands)	Carrying Value		Fair Value		Carrying Value		Fair Value
Assets:
Fixed maturity securities	$	12,745,436	$	12,765,246	$	12,444,394	$	12,462,847
Equity securities available for sale	141,699		141,699		150,866		150,866
Arbitrage trading account	384,519		384,519		376,697		376,697
Loans receivable	149,388		151,920		273,103		275,747
Cash and cash equivalents	837,515		837,515		763,631		763,631
Trading account receivables from brokers and clearing organizations	373,833		373,833		383,115		383,115
Due from broker	—		—		1,713		1,713
Liabilities:
Due to broker	71,024		71,024		—		—
Trading account securities sold but not yet purchased	35,956		35,956		37,035		37,035
Subordinated debentures	446,485		462,256		340,320		355,880
Senior notes and other debt	1,814,998		2,018,282		1,844,621		2,029,572

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 16 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.

(18) Reinsurance

The following is a summary of reinsurance financial information:

	For the Three Months
	Ended March 31,
(In thousands)	2016			2015
Written premiums:
Direct	$	1,709,129		$	1,647,341
Assumed	246,568			204,464
Ceded	(291,975		)	(276,403		)
Total net premiums written	$	1,663,722		$	1,575,402
Earned premiums:
Direct	$	1,568,067		$	1,524,736
Assumed	218,367			203,342
Ceded	(259,099		)	(256,065		)
Total net premiums earned	$	1,527,335		$	1,472,013
Ceded losses and loss expenses incurred	$	126,929		$	118,391
Ceded commissions earned	$	47,973		$	43,651

The Company reinsures a portion of its insurance exposures in order to reduce its net liability on individual risks and catastrophe losses. The Company also cedes premiums to state assigned risk plans and captive insurance companies. Estimated amounts due from reinsurers are reported net of reserves for uncollectible reinsurance of $1 million as of March 31, 2016 and December 31, 2015.

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(19) Restricted Stock Units

Pursuant to its 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. RSUs are expensed pro-ratably over the vesting period. RSU expenses were $9 million and $8 million for the three months ended March 31, 2016 and 2015, respectively. A summary of RSUs issued in the three months ended March 31, 2016 and 2015 follows:

($ in thousands)	Units	Fair Value
Three months ended March 31,
2016	5,580	$	286
2015	10,000	$	503

(20) 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.

(21) Industry Segments

The Company’s reportable segments include the following two business segments:

• Insurance - primarily commercial insurance business, including excess and surplus lines and admitted lines in the United States, United Kingdom, Continental Europe, South America, Canada, Scandinavia, Asia and Australia; and

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

Commencing with the first quarter of 2016, the Company changed the aggregation of its business segments. Insurance-Domestic operating units and Insurance-International operating units, previously reported separately, have been aggregated into the Insurance segment. The segment disclosures for prior periods have been revised to be consistent with the new reportable business segment presentation. The segment disclosures for the years ended December 31, 2015, 2014 and 2013, and as of December 31, 2015 and 2014, have also been included herein, revised for the new reportable business segment presentation.

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.

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Summary financial information about the Company's reporting segments is presented in the following tables. 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) to Common Stockholders
Three months ended March 31, 2016:
Insurance	$	1,375,358	$	105,229	$	26,793	$	1,507,380	$	205,915		$	139,270
Reinsurance	151,977		18,401		—		170,378		21,797			15,117
Corporate, other and eliminations (1)	—		6,503		115,607		122,110		(60,379		)	(39,649		)
Net investment gains	—		—		7,343		7,343		7,343			4,773
Consolidated	$	1,527,335	$	130,133	$	149,743	$	1,807,211	$	174,676		$	119,511
Three months ended March 31, 2015:
Insurance	$	1,311,276	$	99,084	$	25,575	$	1,435,935	$	188,169		$	130,039
Reinsurance	160,737		17,041		—		177,778		20,262			14,500
Corporate, other and eliminations (1)	—		8,114		103,808		111,922		(58,758		)	(38,611		)
Net investment gains	—		—		19,044		19,044		19,044			12,379
Consolidated	$	1,472,013	$	124,239	$	148,427	$	1,744,679	$	168,717		$	118,307
Twelve months ended December 31, 2015:
Insurance	$	5,431,500	$	410,457	$	96,487	$	5,938,444	$	776,593		$	532,286
Reinsurance	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
Twelve months ended December 31, 2014
Insurance	$	5,074,308	$	484,039	$	106,853	$	5,665,200	$	826,088		$	561,643
Reinsurance	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
Twelve months ended December 31, 2013
Insurance	$	4,505,567	$	451,319	$	107,517	$	5,064,403	$	705,662		$	490,273
Reinsurance	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

________

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

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Identifiable Assets

(In thousands)	March 31, 2016		December 31, 2015		December 31, 2014
Insurance	$	18,232,365	$	18,063,730	$	17,944,847
Reinsurance	2,595,231		2,441,340		2,713,554
Corporate, other and eliminations	1,403,338		1,219,086		1,058,290
Consolidated	$	22,230,934	$	21,724,156	$	21,716,691

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

	For the Three Months
	Ended March 31,
(In thousands)	2016		2015
Insurance:
Other liability	$	422,956	$	396,904
Workers’ compensation	345,503		314,738
Short-tail lines	331,857		323,090
Commercial automobile	156,817		165,560
Professional liability	118,225		110,984
Total Insurance	1,375,358		1,311,276
Reinsurance:
Casualty	100,334		112,816
Property	51,643		47,921
Total Reinsurance	151,977		160,737
Total	$	1,527,335	$	1,472,013

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SAFE HARBOR STATEMENT

This is a “Safe Harbor” Statement under the Private Securities Litigation Reform Act of 1995. Any forward-looking statements contained herein, including statements related to our outlook for the industry and for our performance for the year 2016 and beyond, are based upon the Company’s 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 or any other person 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 the conditions in the financial markets and the global economy, and the potential effect of legislative, regulatory, accounting or other initiatives taken in response, 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; the ability 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 related 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 from time to time in the Company’s filings with the Securities and Exchange Commission. 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 in our Annual Report on Form 10-K, elsewhere in this Form 10-Q and our other SEC filings. Forward-looking statements speak only as of the date on which they are made. Except to the extent required by applicable laws, the Company does not undertake any obligation to update or revise any forward-looking statement, whether as a result of new information, future developments or otherwise.

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Item 2. 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 two business segments: Insurance and Reinsurance. Our decentralized structure provides us with the flexibility to respond quickly and efficiently to local or specific market conditions and to pursue specialty business niches. It also allows us to be closer to our customers in order to better understand their individual needs and risk characteristics. While providing our business units with certain operating autonomy, our structure allows us to capitalize on the benefits of economies of scale through centralized capital, investment, reinsurance, enterprise risk management, and actuarial, financial and corporate legal staff support. The Company’s primary sources of revenues and earnings are its insurance operations and its investments.

An important part of our strategy is to form new operating units to capitalize on various business opportunities. Over the years, the Company has formed numerous operating units that are focused on important parts of the economy in the U.S., including high net worth personal lines, 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.

Commencing with the first quarter of 2016, the Company changed the aggregation of its business segments. Insurance-Domestic operating units and Insurance-International operating units, previously reported separately, have been aggregated into the Insurance segment. The segment disclosures for prior periods have been revised to be consistent with the new reportable business segment presentation.

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.

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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 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 reserves are well tested over time, some of 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.

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 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

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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 $9.4 billion as of March 31, 2016 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 March 31, 2016 relate to the Reinsurance segment. There is a higher degree of uncertainty and greater variability regarding estimates of assumed loss reserves because those estimates are based, in part, upon information received from ceding companies. If information received from ceding companies is not timely or correct, the Company’s estimate of ultimate losses may not be accurate. Furthermore, due to delayed reporting of claim information by ceding companies, the claim settlement tail for assumed reinsurance is extended. Management considers the impact of delayed reporting in its selection of assumed loss development factors.

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

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Following is a summary of the Company’s reserves for losses and loss expenses by business segment:

(In thousands)	March 31, 2016		December 31, 2015
Insurance	$	7,937,268	$	7,876,193
Reinsurance	1,435,168		1,368,679
Net reserves for losses and loss expenses	9,372,436		9,244,872
Ceded reserves for losses and loss expenses	1,415,906		1,424,278
Gross reserves for losses and loss expenses	$	10,788,342	$	10,669,150

Following is a summary of the Company’s net reserves for losses and loss expenses by major line of business:

(In thousands)	Reported Case Reserves		Incurred But Not Reported		Total
March 31, 2016
Other liability	$	1,107,501	$	1,946,085	$	3,053,586
Workers’ compensation (1)	1,610,777		1,301,373		2,912,150
Professional liability	250,468		475,044		725,512
Commercial automobile	361,386		253,886		615,272
Short-tail lines (2)	334,239		296,509		630,748
Total Insurance	3,664,371		4,272,897		7,937,268
Reinsurance (1)	677,120		758,048		1,435,168
Total	$	4,341,491	$	5,030,945	$	9,372,436
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 Insurance	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

___________

(1) Reserves for workers’ compensation and reinsurance are net of an aggregate net discount of $689million and $699 million as of March 31, 2016 and December 31, 2015, respectively.

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

The Company evaluates reserves for losses and loss adjustment 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 adjustment expenses for prior years may be fully or partially offset by additional or return premiums.

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Net prior year development (i.e, the sum of prior year reserve changes and prior year earned premiums changes) for the three months ended March 31, 2016 and 2015 are as follows:

(In thousands)	2016		2015
Net decrease in prior year loss reserves	$	5,601	$	2,499
Increase in prior year earned premiums	6,687		9,304
Net favorable prior year development	$	12,288	$	11,803

In 2016, favorable prior year development (net of additional and return premiums) of $12.3 million included $11.6 million for the Insurance segment and $0.7 million for the Reinsurance segment. The favorable development for the Insurance segment was primarily attributable to workers' compensation business from accident years 2010 through 2015, partially offset by adverse development for commercial auto liability from accident years 2011 through 2014. The favorable development for workers' compensation reflects favorable claim frequency trends (i.e., number of reported claims per unit of exposure), while the unfavorable development for commercial auto liability was driven by higher large loss activity than expected.

In 2015, favorable reserve development (net of additional and return premiums) of $12 million was primarily related to the excess and surplus lines casualty business within the Insurance segment, partially offset by adverse development in commercial auto liability. The favorable development for excess and surplus lines reflected the continuation of favorable claim frequency trends (i.e., number of reported claims per unit of exposure), while the unfavorable development for commercial auto liability was driven by higher large loss activity.

Reserve Discount. The Company discounts its liabilities for certain workers’ compensation reserves. The amount of workers’ compensation reserves that were discounted was $1,982 million and $2,308 million at March 31, 2016 and December 31, 2015, respectively. The aggregate net discount for those reserves, after reflecting the effects of ceded reinsurance, was $689 million and $699 million at March 31, 2016 and December 31, 2015, respectively. At March 31, 2016, discount rates by year ranged from 2.0% to 6.5%, with a weighted average discount rate of 3.9%.

Substantially all of the workers’ compensation discount (98% at March 31, 2016) relates to 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 March 31, 2016), 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 $69 million at March 31, 2016 and $62 million at December 31, 2015. 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 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

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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 March 31, 2016:

($ in thousands)	Number of Securities	Aggregate Fair Value		Unrealized Loss
Unrealized loss less than 20% of amortized cost	351	$	2,631,606	$	55,136
Unrealized loss of 20% or greater of amortized cost:
Less than twelve months	4	14,143		7,584
Twelve months and longer	5	41,667		14,391
Total	360	$	2,687,416	$	77,111

A summary of the Company’s non-investment grade fixed maturity securities that were in an unrealized loss position at March 31, 2016 is presented in the table below:

($ in thousands)	Number of Securities	Aggregate Fair Value		Unrealized Loss
Mortgage-backed securities	12	$	35,540	$	1,866
Asset-backed securities	7	26,322		261
Corporate	15	92,666		10,780
Foreign government	5	22,414		3,011
Total	39	$	176,942	$	15,918

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.

Preferred Stocks - At March 31, 2016, there were five preferred stocks in an unrealized loss position, with an aggregate fair value of $62.9 million and a gross unrealized loss of $10.4 million. Based on management's view of the underlying value of these securities, the Company does not consider these equity securities to be OTTI.

Common Stocks – At March 31, 2016, there was one common stock in an unrealized loss position, with fair value of $7.5 million and a gross unrealized loss of $1.5 million. Based upon management’s view of the underlying value of this security, the Company does not consider the equity security to be OTTI. For the three months ended March 31, 2016, the

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Company reported OTTI for common stocks of $18.1 million. There were no OTTI of common stocks for the three months ended March 31, 2015.

Loans Receivable – The Company monitors the performance of its loans receivable, including current market conditions for each loan and the ability to collect principal and interest. For loans where the Company determines it is probable that the contractual terms will not be met, an analysis is performed and a valuation reserve is established, if necessary, with a charge to earnings. Loans receivable are reported net of a valuation reserve of $3 million and $2 million at March 31, 2016 and December 31, 2015, 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.

The following is a summary of pricing sources for the Company's fixed maturity securities available for sale as of March 31, 2016:

($ in thousands)	Carrying Value		Percent of Total
Pricing source:
Independent pricing services	$	12,403,307	98.1	%
Syndicate manager	65,588		0.5
Directly by the Company based on:
Observable data	179,675		1.4
Cash flow model	197		—
Total	$	12,648,767	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

30

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 March 31, 2016, 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 Three Months Ended March 31, 2016 and 2015

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 premiums earned), expense ratios (underwriting expenses expressed as a percentage of premiums earned) and United States Generally Accepted Accounting Principles (“GAAP”) combined ratios (sum of loss ratio and expense ratio) for each of our business segments for the three months ended March 31, 2016 and 2015. 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)	2016			2015
Insurance:
Gross premiums written	$	1,763,070		$	1,692,403
Net premiums written	1,488,737			1,425,139
Net premiums earned	1,375,358			1,311,276
Loss ratio	60.5		%	61.1		%
Expense ratio	32.5		%	32.4		%
GAAP combined ratio	93.0		%	93.5		%
Reinsurance:
Gross premiums written	$	192,627		$	159,402
Net premiums written	174,985			150,263
Net premiums earned	151,977			160,737
Loss ratio	59.6		%	62.2		%
Expense ratio	38.2		%	35.8		%
GAAP combined ratio	97.8		%	98.0		%
Consolidated:
Gross premiums written	$	1,955,697		$	1,851,805
Net premiums written	1,663,722			1,575,402
Net premiums earned	1,527,335			1,472,013
Loss ratio	60.4		%	61.2		%
Expense ratio	33.1		%	32.7		%
GAAP combined ratio	93.5		%	93.9		%

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 three months ended March 31, 2016 and 2015:

(In thousands, except per share data)	2016		2015
Net income to common stockholders	$	119,511	$	118,307
Weighted average diluted shares	128,529		132,484
Net income per diluted share	$	0.93	$	0.89

The Company reported net income of $120 million in 2016 compared to $118 million in 2015. The 1% increase in net income was primarily due to an increase in after-tax underwriting income of $7 million and an increase in after-tax net investment income of $2 million, largely offset by a net decrease in after-tax net investment gains and other than temporary impairments of $7 million. The number of weighted average diluted shares decreased as a result of the Company’s repurchases of its common stock in 2016 and 2015.

Premiums. Gross premiums written were $1,956 million in 2016, an increase of 6% from $1,852 million in 2015. The growth was due primarily to an increase in new business of 7%. Approximately 77.8% of policies expiring in 2016 were renewed, compared with a 79.2% renewal retention rate for policies expiring in 2015.

Average renewal premium rates for insurance and facultative reinsurance increased 1% in 2016 when adjusted for change in exposures. 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.

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A summary of gross premiums written in 2016 compared with 2015 by line of business within each business segment follows:

• Insurance - gross premiums increased 4% to $1,763 million in 2016 from $1,692 million in 2015. Gross premiums increased $49 million (10%) for other liability, $32 million (7%) for workers' compensation and $11 million (8%) for professional liability, and decreased $11 million (3%) for short-tail lines and $10 million (6%) for commercial auto.

• Reinsurance - gross premiums increased 21% to $193 million in 2016 from $159 million in 2015. Gross premiums increased $39 million (82%) for property lines and decreased $5 million (5%) for casualty lines. The increase in property premiums was primarily due to growth in structured property reinsurance.

Net premiums written were $1,664 million in 2016, an increase of 6% from $1,575 million in 2015. Ceded reinsurance premiums as a percentage of gross written premiums were 15% in 2016 and in 2015.

Premiums earned increased 4% to $1,527 million in 2016 from $1,472 million in 2015. 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 2016 are related to business written during both 2016 and 2015. Audit premiums were $41 million in 2016 compared with $37 million in 2015.

Net Investment Income. Following is a summary of net investment income for the three months ended March 31, 2016 and 2015:

	Amount						Average Annualized Yield
($ In thousands)	2016			2015			2016		2015
Fixed maturity securities, including cash and cash equivalents and loans receivable	$	108,835		$	108,129		3.2	%	3.3	%
Investment funds	16,636			6,061			5.5		2.0
Arbitrage trading account	3,190			8,979			3.7		6.8
Real estate	2,717			2,767			1.1		1.5
Equity securities available for sale	868			1,180			2.2		2.9
Gross investment income	132,246			127,116			3.3		3.2
Investment expenses	(2,113		)	(2,877		)
Total	$	130,133		$	124,239		3.2	%	3.1	%

Net investment income increased 4.7% to $130 million in 2016 from $124 million in 2015 due primarily to a $10 million increase in income from investment funds partially offset by a decrease in the arbitrage trading account of $6 million. The increase in investment income from investment funds (reported on a one-quarter lag) was primarily due to improvement in the performance for energy funds. Average invested assets, at cost (including cash and cash equivalents), were $16.2 billion in 2016 and $16.0 billion in 2015.

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 $40 million in 2016 from $37 million in 2015.

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 $25 million in 2016 compared with $19 million in 2015.

Other-Than-Temporary Impairments. Other-than-temporary impairments of $18 million in 2016, were related to common stocks. There were no impairments in 2015.

Revenues from Non-Insurance Businesses. Revenues from non-insurance businesses 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 non-insurance businesses were $102 million in 2016 and $93 million in 2015.

Losses and Loss Expenses. Losses and loss expenses increased to $922 million in 2016 from $901 million in 2015. The consolidated loss ratio was 60.4% in 2016 and 61.2% in 2015. Catastrophe losses, net of reinsurance recoveries and

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reinstatement premiums, were $16 million in 2016 and $14 million in 2015. Favorable prior year reserve development (net of premium offsets) was $12 million in both 2016 and 2015. The loss ratio excluding catastrophe losses and prior year reserve development decreased 0.8 points to 60.2% in 2016 from 61.0% in 2015.

A summary of loss ratios in 2016 compared with 2015 by business segment follows:

• Insurance - The loss ratio of 60.5% in 2016 was 0.6 points lower than the loss ratio of 61.1% in 2015. Catastrophe losses were $15 million in 2016 compared with $14 million in 2015. Favorable prior year reserve development was $12 million in both 2016 and 2015. The loss ratio excluding catastrophe losses and prior year reserve development decreased 0.7 points to 60.2% in 2016 from 60.9% in 2015.

• Reinsurance - The loss ratio of 59.6% in 2016 was 2.6 points lower than the loss ratio of 62.2% in 2015. Catastrophe losses were $0.5 million in 2016 compared with none in 2015. Favorable prior year reserve development was $0.7 million in 2016 compared with $0.2 million in 2015. The loss ratio excluding catastrophe losses and prior year reserve development decreased 2.6 points to 59.7% in 2016 from 62.3% in 2015.

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

(In thousands)	2016		2015
Underwriting expenses	$	505,255	$	482,060
Service expenses	33,798		31,084
Net foreign currency losses (gains)	3,728		(567		)
Other costs and expenses	39,678		38,469
Total	$	582,459	$	551,046

Underwriting expenses are comprised of commissions paid to agents and brokers, premium taxes and other assessments and internal underwriting costs. Underwriting expenses increased 4.8% compared with an increase in net premiums earned of 3.8%. The expense ratio (underwriting expenses expressed as a percentage of premiums earned) increased to 33.1% from 32.7% in 2015 due, in part, to expenses associated with new business initiatives.

Service expenses, which represent the costs associated with the fee-based businesses, increased to $34 million in 2016 from $31 million in 2015.

Net foreign currency losses (gains) result from transactions denominated in a currency other than a company's operating functional currency. Net foreign currency losses were $3.7 million in 2016 compared to gain of $0.6 million in 2015.

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 $39.7 million in 2016 from $38.5 million in 2015.

Expenses from Non-Insurance Businesses. Expenses from non-insurance businesses 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 non-insurance businesses were $96 million in 2016 compared to $90 million in 2015.

Interest Expense. Interest expense was $32 million in 2016 compared with $35 million in 2015. The Company repaid $200 million of 5.60% senior notes at maturity on May 15, 2015. In February 2016, the Company issued $110 million of junior subordinated debentures.

Income Taxes. The effective income tax rate was 31.1% in 2016 and 29.8% in 2015. The higher tax rate in 2016 was due, in part, to the higher overall effective tax rate related to the Company's foreign operations. 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 $72 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 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 average duration of the investment portfolio and the approximate duration of its liabilities (i.e., policy claims and debt obligations). The average duration of the fixed maturity portfolio, including cash and cash equivalents, was 3.1 years at March 31, 2016, down from 3.3 years at December 31, 2015. The Company’s fixed maturity investment portfolio and investment-related assets as of March 31, 2016 were as follows:

($ in thousands)	Carrying Value		Percent of Total
Fixed maturity securities:
U.S. government and government agencies	$	597,951	3.6	%
State and municipal:
Special revenue	2,754,797		16.8
State general obligation	657,062		4.0
Pre-refunded (1)	441,106		2.7
Local general obligation	407,243		2.5
Corporate backed	402,824		2.5
Total state and municipal	4,663,032		28.5
Mortgage-backed securities:
Agency	832,541		5.1
Residential-Prime	227,355		1.4
Commercial	65,300		0.4
Residential-Alt A	48,358		0.3
Total mortgage-backed securities	1,173,554		7.2
Asset-backed securities	1,844,404		11.2
Corporate:
Industrial	2,093,572		12.7
Financial	1,202,140		7.3
Utilities	206,149		1.3
Other	66,715		0.4
Total corporate	3,568,576		21.7
Foreign government and foreign government agencies	897,919		5.5
Total fixed maturity securities	12,745,436		77.7
Equity securities available for sale:
Preferred stocks	104,128		0.6
Common stocks	37,571		0.2
Total equity securities available for sale	141,699		0.8
Investment funds	1,179,310		7.2
Real estate	986,810		6.0
Cash and cash equivalents	837,515		5.1
Arbitrage trading account	384,519		2.3
Loans receivable	149,388		0.9
Total investments	$	16,424,677	100.0	%

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(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.

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 March 31, 2016, investments in foreign government fixed maturity securities (which are generally held by the Company's foreign operations) were as follows:

(In thousands)	Carrying Value
Australia	$	250,641
Argentina	161,778
Canada	158,180
United Kingdom	157,261
Germany	52,226
Supranational (1)	36,421
Norway	33,904
Brazil	31,388
Singapore	6,483
Colombia	5,798
Uruguay	3,839
Total	$	897,919

________

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

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

Investment Funds. At March 31, 2016, the carrying value of investment funds was $1,179 million, including investments in real estate funds of $597 million, energy funds of $96 million and hedge equity funds of $68 million. Investment funds are generally reported on a one-quarter lag.

Real Estate. Real estate is directly owned property held for investment. At March 31, 2016, real estate properties in operation included a long-term ground lease in Washington D.C., a hotel in Memphis, Tennessee 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 aggregate cost of $149 million and an aggregate fair value of $152 million at March 31, 2016. The amortized cost of loans receivable is net of a valuation allowance

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of $3 million as of March 31, 2016. Loans receivable include real estate loans of $122 million that are secured by commercial real estate located primarily in Delaware, Maryland, and New York. Real estate loans receivable generally earn interest at floating LIBOR-based interest rates and have maturities (inclusive of extension options) through August 2025. Loans receivable include commercial loans of $27 million that are secured by business assets and have fixed interest rates with varying maturities not exceeding 10 years.

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 3.1 years at March 31, 2016, down from 3.3 years at December 31, 2015.

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.

Liquidity and Capital Resources

Cash Flow. Cash flow provided from operating activities increased to $141 million in the first three months of 2016 from $61 million in the comparable period in 2015, primarily due to the timing of tax payments, premium collections and expense payments.

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 targets an average duration for its investment portfolio that is within one year of the average duration of its liabilities so that portions of its investment portfolio mature throughout the claim cycle and are available for the payment of claims if necessary. In the event operating cash flow and proceeds from maturities and prepayments of fixed income securities are not sufficient to fund claim payments and other cash requirements, the remainder of the Company's cash and investments is available to pay claims and other obligations as they become due. The Company's investment portfolio is highly liquid, with approximately 83% invested in cash, cash equivalents and marketable fixed maturity securities as of March 31, 2016. 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 March 31, 2016, the Company had senior notes, subordinated debentures and other debt outstanding with a carrying value of $2,261 million and a face amount of $2,288 million. The maturities of the outstanding debt are $23 million in 2016, $36 million in 2017, $441 million in 2019, $300 million in 2020, $426 million in 2022, $250 million in 2037, $350 million in 2044, $352 million in 2053 and $110 million in 2056.

In March 2016, the Company issued $110 million aggregate principal amount of its 5.9% junior subordinated debentures due 2056. In May 2015, the Company repaid $200 million of 5.60% senior notes at maturity and $71 million of mortgage loans.

Equity. At March 31, 2016, total common stockholders’ equity was $4.8 billion, common shares outstanding were approximately 123 million and stockholders’ equity per outstanding share was $38.75. During the three months ended March 31, 2016, the Company repurchased 734,055 shares of its common stock for $37 million.

Total Capital.Total capitalization (equity, debt and subordinated debentures) was $7 billion at March 31, 2016. The percentage of the Company’s capital attributable to debt and subordinated debentures was 32% at March 31, 2016 and December 31, 2015.

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Item 3. Quantitative and Qualitative Disclosure About Market Risk

Reference is made to the information under “Investments - Market Risk” under the caption “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in this Form 10-Q.

Item 4. Controls and Procedures

Disclosure Controls and Procedures. The Company’s management, including its Chief Executive Officer and Chief Financial Officer, has conducted an evaluation of the effectiveness of the Company’s disclosure controls and procedures pursuant to Securities Exchange Act Rule 13a-14 as of the end of the period covered by this quarterly 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 Securities Exchange Act of 1934, as amended, and the rules thereunder, is recorded, processed, summarized and reported within the time periods specified in the Securities and Exchange Commission’s rules and forms.

Changes in Internal Control over Financial Reporting. During the quarter ended March 31, 2016, there were no changes in the Company’s internal control over financial reporting that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting.

PART II — OTHER INFORMATION

Item 1.Legal Proceedings

Please see Note 20 to the notes to the interim consolidated financial statements.

Item 1A.Risk Factors

There have been no material changes from the risk factors previously disclosed in the Company’s annual report on Form 10-K for the fiscal year ended December 31, 2015.

Item 2.Unregistered Sales of Equity Securities and Use of Proceeds

Set forth below is a summary of the shares repurchased by the Company during the three months ended March 31, 2016 and the number of shares remaining authorized for purchase by the Company.

	Total number of shares purchased	Average price paid per share		Total number of shares purchased as part of publicly announced plans or programs	Maximum number of shares that may yet be purchased under the plans or programs
January	299,831	$	52.52	299,831	8,947,147
February	434,224	$	49.92	434,224	8,512,923
March	—	$	—	—	8,512,923

Item 6.Exhibits

Number
(10.1)	Form of 2016 Performance Unit Award Agreement under the W. R. Berkley Corporation 2014 Long-Term Incentive Plan.
(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.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this Report to be signed on its behalf by the undersigned thereunto duly authorized.

		W. R. BERKLEY CORPORATION
Date:	May 10, 2016	/s/ W. Robert Berkley, Jr.
		W. Robert Berkley, Jr.
		President and Chief Executive Officer
Date:	May 10, 2016	/s/ Eugene G. Ballard
		Eugene G. Ballard
		Executive Vice President - Chief Financial Officer

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EX-10.1

2016 Performance Unit Award AgreementUnder the W. R. Berkley Corporation 2014 Long-Term Incentive Plan

This 2016 Performance Unit Award Agreement (this “Agreement”), effective January 1, 2016, represents an Award of Performance Units by W. R. Berkley Corporation (the “Company”), to the Participant named below, pursuant to the provisions of the W. R. Berkley Corporation 2014 Long-Term Incentive Plan (the “Plan”). The value of the Performance Units will be determined based on the increase in the Company’s Book Value Per Share during the Performance Period, as determined below.

The Plan provides a complete description of the terms and conditions governing the Performance Units. If there is any inconsistency between the terms of this Agreement and the terms of the Plan, the Plan’s terms shall completely supersede and replace the conflicting terms of this Agreement. All capitalized terms shall have the meanings ascribed to them in the Plan, unless specifically set forth otherwise herein. The parties hereto agree as follows:

1.    General Grant Information. The individual named below has been selected to be a Participant in the Plan and receive a grant of Performance Units, as specified below:

(a) Participant:

(b) Number of Performance Units Granted:

(c) Initial Value of Performance Units: $0.00

(d) Date of Grant: January 1, 2016

(e) Performance Measure: Increase in Book Value Per Share, as set forth in Section 3 below.

2.    Performance Period. The Performance Period commences on January 1, 2016, and ends on December 31, 2020; provided, however, that, in the event that the Participant dies or experiences a Qualifying Termination, the Performance Period for such Participant shall be deemed to end on December 31 of the fiscal year immediately prior to the fiscal year in which such death or Qualifying Termination occurred.

3.    Value of a Performance Unit. Each Performance Unit shall have a value determined by multiplying the Increase in Book Value Per Share by three and twenty nine hundredths (3.29), subject to a maximum value of one hundred dollars ($100.00) per Performance Unit.

4.    Eligibility for Earned Performance Units. The Participant shall only be eligible for payment of earned Performance Units. Performance Units will be earned only if the Participant’s employment with the Company continues through the end of the Performance Period. Notwithstanding anything herein to the contrary, the Performance Units shall not be earned and shall not become payable unless and until the Participant has complied with the Competitive Action restriction set forth in Section 5(d) below on or prior to the Settlement Date.

1

5.    Payout of Performance Units. (a) Except as set forth in Section 5(b) or 8 below, the aggregate positive value, if any, of the earned Performance Units, based on the value of the earned Performance Units on the last day of the Performance Period as determined in accordance with this Agreement and subject to the maximum value set forth in Section 3 hereof, shall be paid to the Participant in cash following the last day of the Performance Period but in no event later than March 31, 2021.

(b)    In the event of the death or Qualifying Termination of the Participant, payment of the value, if any, of the earned Performance Units in accordance with the terms of this Agreement shall extinguish the Company’s obligation hereunder, and the Participant shall not be entitled to any further payment or appreciation in the value of the Performance Units. In the event such payment is made due to the Participant’s death, such payment shall be made to the Participant’s beneficiary (or the Participant’s estate if no beneficiary has been chosen or if such beneficiary has predeceased the Participant). Any payment upon death or any Qualifying Termination shall be made within ninety (90) calendar days following such death or Qualifying Termination; provided, however, that if such ninety (90) day period spans two separate taxable years, such payment shall be made in the later taxable year; provided further, however, that any payment hereunder (calculated as of the end of the fiscal year immediately prior to the fiscal year in which such Qualifying Termination occurred) upon a Qualifying Termination shall be delayed until the earlier of (x) March 31, 2021 and (y) such time as the Participant has also undergone a “separation from service” as defined in Treas. Reg. 1.409A-1(h), at which time such payment shall be made to the Participant according to the schedule set forth in this Section 5(b) as if the Participant had undergone such Qualifying Termination (under the same circumstances),solely for the purpose of the date of payment, on the date of such “separation from service.” Notwithstanding anything herein to the contrary, to the extent the Participant is a “specified employee” as defined in Treas. Reg. 1.409A-1(i), any payment to be made upon the Participant’s “separation from service” shall be delayed until and made upon the earlier of (i) the six (6) month anniversary of the Participant’s “separation from service” and (ii) the Participant’s death.

(c)    This Award shall expire and the Company shall have no further obligation to make any payment hereunder once a payment is made pursuant to Section 5(a) or (b) above or Section 8 below.

(d)    If on or prior to the Settlement Date, the Participant engages in a Competitive Action or enters into, or has entered into, an agreement (written, oral or otherwise) to engage in Competitive Action or has engaged in Misconduct, all of the Performance Units, whether earned or unearned, shall be immediately forfeited, and the Participant shall have no further rights with respect to such Performance Units. In the event that the Participant engages in any Competitive Action or enters into, or has entered into, an agreement (written, oral or otherwise) to engage in Competitive Action or engages in Misconduct after the Settlement Date but on or prior to the second anniversary of the Settlement Date, the Participant shall pay to the Company, upon demand by the Company, an amount equal to the amount paid to the Participant in respect of the Performance Units on the Settlement Date. The determination as to whether the Participant has engaged in any Competitive Action or Misconduct shall be made by the Committee in its sole and absolute discretion. The Committee has sole and absolute discretion to determine whether, notwithstanding its determination that the Participant has engaged in a Competitive Action or Misconduct, recapture or forfeiture as provided herein shall not occur. The Committee’s exercise or nonexercise of such discretion with respect to

2

any particular event or occurrence by or with respect to the Participant or any other recipient of Performance Units under the Plan shall not in any way reduce or eliminate the authority of the Committee to (i) determine that any event or occurrence by or with respect to the Participant constitutes engaging in Competitive Action or Misconduct, or (ii) determine the related Competitive Action or Misconduct date. The Participant acknowledges that the restriction with respect to engaging in a Competitive Action, in view of the nature of the business in which the Company is engaged, is reasonable in scope (as to both the temporal and geographical limits) and necessary in order to protect the legitimate business interests of the Company. The Participant acknowledges further that engaging in a Competitive Action or Misconduct would result in irreparable injuries to the Company and would cause loss in an amount that cannot be readily quantified. The Participant acknowledges further the amounts required to be paid to the Company pursuant to this provision are reasonable and are not liquidated damages nor shall they be characterized as such.

(e)    The Participant’s employment will not be considered to continue if his or her employment has been terminated (regardless of the reason for such termination and whether or not later found to be invalid or in breach of employment laws in the jurisdiction where the Participant is employed or the terms of the Participant’s employment agreement, if any), and unless otherwise expressly provided in this Agreement or determined by the Committee, the Participant’s right to continue to earn pursuant to the Performance Units awarded hereunder, if any, will terminate as of such date and will not be extended by any notice period arising under local law or contract (e.g., unless the Participant is actively providing substantial services as required by the Company during any notice period. However, the Participant’s period of service would not include any contractual notice period or any period of “garden leave” or similar period arising under employment laws in the jurisdictions where the Participant is employed or the terms of Participant’s employment agreement, if any).

6.    Nontransferability. The Performance Units granted hereunder may not be sold, transferred, pledged, assigned, or otherwise alienated or hypothecated, other than by will or by the laws of descent and distribution.

7.    Administration. This Agreement and the rights of the Participant hereunder are subject to all the terms and conditions of the Plan, as the same may be amended from time to time, as well as to such rules and regulations as the Committee may adopt for administration of the Plan. It is expressly understood that the Committee is authorized to administer, construe, and make all determinations necessary or appropriate to the administration of the Plan and this Agreement, all of which shall be final and binding upon the Participant, including without limitation any determination concerning a Competitive Action. Any inconsistency between the Agreement and the Plan shall be resolved in favor of the Plan.

8.    Change in Control. In the event of a Change in Control, unless otherwise specifically prohibited under applicable laws or by the rules and regulations of any governing governmental agencies or national securities exchanges:

(a)    With respect to each outstanding Performance Unit that is assumed or substituted in connection with a Change in Control, in the event that the Participant’s employment with the Company is terminated (i) by the Company or a Subsidiary or Affiliate, as applicable, without Cause

3

or (ii) by the Participant for Good Reason, in each case during the eighteen (18) month period following such Change in Control, the value of all Performance Units shall be determined and fixed as of the end of the fiscal year immediately preceding the fiscal year in which such termination occurs, and such value shall be paid to the Participant in accordance with, and subject to, the provisions of Sections 4 and 5 hereof. Following such termination, Performance Units shall not accrue any additional value for the fiscal year in which such termination occurs or for any subsequent fiscal years.

(b)    With respect to each outstanding Performance Unit that is not assumed or substituted in connection with a Change in Control, immediately upon the occurrence of the Change in Control, which shall be deemed the end of the Performance Period, the value of all Performance Units shall be determined and fixed as of the end of the fiscal year immediately preceding the fiscal year in which such Change in Control occurs, and such value shall be paid to the Participant within ninety (90) calendar days following the date of such Change in Control; provided, however, that if such ninety (90) day period spans two separate taxable years, such payment shall be made in the later taxable year. Following such Change in Control, Performance Units shall not accrue any additional value for the fiscal year in which such Change in Control occurs or for any subsequent fiscal years.

(c)    For purposes of this Section 8, a Performance Unit shall be considered assumed or substituted for if, following the Change in Control, the Performance Unit is assumed or substituted for with one of comparable value and remains subject to the same terms and conditions that were applicable to the Performance Units immediately prior to the Change in Control.

(d)    For purposes of this Section 8, an event shall only constitute a Change in Control if the event constituting a Change in Control also constitutes “a change in the ownership or effective control of the Company, or in the ownership of a substantial portion of the assets of the Company” within the meaning of Section 409A(a)(2)(A)(v) of the Code and the regulations promulgated thereunder.

9.    Miscellaneous.

(a)    This Agreement shall not confer upon the Participant any right to continuation of employment by the Company, nor shall this Agreement interfere in any way with the Company’s right to terminate the Participant’s employment at any time.

(b)    The Committee may terminate, amend, or modify the Plan; provided, however, that no such termination, amendment, or modification of the Plan may in any material way adversely affect the Participant’s rights under this Agreement.

(c)    The Company or a Subsidiary or Affiliate, as applicable, shall have the authority to deduct or withhold from any payment hereunder or from any other source of the Participant’s compensation from the Company or a Subsidiary or Affiliate, as applicable, or may require the Participant to remit to the Company or a Subsidiary or Affiliate, as applicable, before payment hereunder, an amount sufficient to satisfy federal, state, and local taxes (including Participant’s FICA obligation) required by law to be withheld with respect to any taxable event arising out of this Agreement.

4

(d)    This Agreement shall be subject to all applicable laws, rules, and regulations, and to such approvals by any governmental agencies or national securities exchanges as may be required.

(e)    To the extent not preempted by federal law, this Agreement shall be governed by, and construed in accordance with, the laws of the State of Delaware, regardless of its conflicts of laws principles.

(f)    All obligations of the Company under the Plan and this Agreement with respect to the Performance Units shall be binding on any successor to the Company, whether the existence of such successor is the result of a direct or indirect purchase, merger, consolidation, or otherwise, of all or substantially all of the business and/or assets of the Company.

(g)    The provisions of this Agreement are severable and if any one or more provisions are determined to be illegal or otherwise unenforceable, in whole or in part, the remaining provisions shall nevertheless be binding and enforceable.

(h)    By accepting this Award or other benefit under the Plan, the Participant and each person claiming under or through the Participant shall be conclusively deemed to have indicated their acceptance and ratification of, and consent to, any action taken under the Plan by the Company, the Board or the Committee.

(i)    The Participant, every person claiming under or through the Participant, and the Company hereby waive to the fullest extent permitted by applicable law any right to a trial by jury with respect to any litigation directly or indirectly arising out of, under, or in connection with the Plan or this Award Agreement issued pursuant to the Plan.

(j)    Definitions. The following terms shall have the meanings ascribed to them when used in this Agreement:

(i)    “Beginning Book Value Per Share” means $37.85.

(ii)    “Book Value Per Share” as of the end of any fiscal year shall be equal to the quotient of X divided by Z, where X is equal to the sum of A, B, C, D and E minus F, and Z is equal to the sum of W plus Y: [(A+B+C+D+E-F) ÷ (W+Y)]. For purposes of this calculation,

(A) shall be equal to the Company’s total common stockholders’ equity as of the end of such fiscal year, as determined in accordance with generally accepted accounting principles and reported in the Company’s audited financial statements,

(B) shall be equal to the cumulative after-tax expense of the Company from January 1, 2016 through the end of such fiscal year arising from all the Awards made under the Plan,

(C) shall be equal to the cumulative cash dividends on the Company’s common stock declared from January 1, 2016 through the end of such fiscal year,

5

(D) shall be equal to the cumulative cost of the Company’s common stock repurchased by the Company from January 1, 2016 through the end of such fiscal year,

(E) shall represent imputed interest on the cost of the Company’s common stock repurchased by the Company and the amount of special dividends (any dividend other than the regular quarterly cash dividend) paid by the Company during the Performance Period. Such interest shall be imputed on such repurchases and special dividends from the first day of the quarter following such repurchases and special dividends to the end of the Performance Period. The imputed interest rate shall be equal to the average annual Increase in Book Value Per Share for the Performance Period, before consideration of this subsection E,

(F) shall be equal to the Company’s accumulated other comprehensive income as of the end of such fiscal year,

(W) shall be equal to the number of shares of the Company’s common stock issued and outstanding, net of treasury shares, as of the end of such fiscal year, and

(Y) shall be the cumulative number of shares of the Company’s common stock repurchased by the Company from January 1, 2016 through the end of such fiscal year.

Book Value Per Share shall be calculated without taking into account any forward or reverse split of the Company’s common stock or any stock dividend declared on the Company’s common stock and there shall be no adjustment to the number of Performance Units awarded hereunder in either event. Notwithstanding anything herein to the contrary the formula to determine Book Value Per Share may be further modified to take into account any factor set forth in Section 7.2 of the Plan.

(iii)    “Cause” means “Cause” as defined in any active employment agreement between the Participant and the Company or any Subsidiary or Affiliate, as applicable, or, in the absence of any such definition, means the occurrence of any one of the following events: (i) fraud, personal dishonesty, embezzlement or acts of gross negligence or gross misconduct on the part of the Participant in the course of his or her employment or services, (ii) the Participant’s engagement in conduct that is materially injurious to the Company, a Subsidiary or an Affiliate, (iii) the Participant’s conviction by a court of competent jurisdiction of, or pleading “guilty” or “no contest” to, (x) a felony or (y) any other criminal charge (other than minor traffic violations) which could reasonably be expected to have a material adverse impact on the Company’s or a Subsidiary’s or an Affiliate’s reputation or business; (iv) public or consistent drunkenness by the Participant or his or her illegal use of narcotics which is, or could reasonably be expected to become, materially injurious to the reputation or business of the Company, a Subsidiary or an Affiliate or which impairs, or could reasonably be expected to impair, the performance of the Participant’s duties to the Company, a Subsidiary or an Affiliate; (v) willful failure by the Participant to follow the lawful directions of a superior officer; or (vi) the Participant’s continued and material failure to fulfill his or her employment obligations to the Company or any Subsidiary or Affiliate.

(iv)    “Competitive Action” means, either directly or indirectly, whether as an employee, consultant, independent contractor, partner, joint venturer or otherwise, (i) in any geographical area where the Company is engaged in business, engaging in or directing any business

6

activities which are competitive with any business activities conducted by the Company in such geographical area, (ii) on behalf of any person or entity engaged in business activities competitive with the business activities of the Company, soliciting or inducing, or in any manner attempting to solicit or induce, any person employed by, or as an agent or producer of, the Company to terminate such person's employment or agency or producer relationship, as the case may be, with the Company, (iii) diverting, or attempting to divert, any person, concern or entity from doing business with the Company or attempting to induce any such person, concern or entity to cease being a customer of the Company, (iv) soliciting the business of the Company or (v) making use of, or attempting to make use of, the Company’s property or proprietary information, other than in the course of the performance of services to the Company or at the direction of the Company. References to the Company in this definition shall include the Company and all Subsidiaries and Affiliates.

(v)    “Disability” means the inability of the Participant to continue to perform services for the Company or any Subsidiary or Affiliate, as applicable, on account of his or her total and permanent disability as determined by the Committee.

(vi)    “Ending Book Value Per Share” means the highest Book Value Per Share determined as of the end of each fiscal year in the Performance Period.

(vii)    “Good Reason” means “Good Reason” as defined in any active employment agreement between the Participant and the Company or any Subsidiary or Affiliate, as applicable, or, in the absence of any such definition, means the occurrence of any one of the following events, unless the Participant agrees in writing that such event shall not constitute Good Reason: (i) a material reduction in the Participant’s duties or responsibilities from those in effect immediately prior to a Change in Control; (ii) a material reduction in the Participant’s base salary below the levels in effect immediately prior to a Change in Control; or (iii) relocation of the Participant’s primary place of employment to a location more than fifty (50) miles from its location, and further from the Participant’s primary residence, immediately prior to a Change in Control; provided, however, that with respect to any Good Reason termination, the Company will be given not less than thirty (30) days’ written notice by the Participant (within sixty (60) days of the occurrence of the event constituting Good Reason) of the Participant’s intention to terminate the Participant’s employment for Good Reason, such notice to state in detail the particular act or acts or failure or failures to act that constitute the grounds on which the proposed termination for Good Reason is based, and such termination shall be effective at the expiration of such thirty (30) day notice period only if the Company has not fully cured such act or acts or failure or failures to act that give rise to Good Reason during such period. Further notwithstanding any provision in this definition to the contrary, in order to constitute a termination for Good Reason, such termination must occur within six (6) months of the initial existence of the applicable condition.

(viii)    “Increase in Book Value Per Share” means the amount, if any, by which the Ending Book Value Per Share exceeds Beginning Book Value Per Share for the Performance Period.

(ix)    “Misconduct” means the Participant’s engagement, during the Participant’s employment with the Company or any Subsidiary or any Affiliate, in an act which would, in the judgment of the Committee, constitute fraud that could be punishable as a crime, or embezzlement against either the Company, any Subsidiary or any Affiliate.

7

(x)    “Qualifying Termination” means the termination of the Participant’s employment with the Company and all Subsidiaries and Affiliates prior to the end of the Performance Period as a result of: (i) Disability or Retirement; (ii) an action by the Company or a Subsidiary or Affiliate, as applicable, for any reason other than Cause; or, (iii) following a Change in Control, an action by the Participant for Good Reason.

(xi)    “Retirement” means the Participant’s retirement from service with the Company and all Subsidiaries and Affiliates with the written consent of the Chairman of the Board of the Company or the Committee.

(xii)    “Settlement Date” means the date on which the value of the Performance Units is actually paid to the Participant.

[Signatures to appear on following page]

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IN WITNESS WHEREOF, the parties have caused this Agreement to be executed effective as of January 1, 2016.

W. R. Berkley Corporation
By:
	Name:
	Title:
Participant

Please indicate the name of the Participant’s beneficiary:

Name

The Participant may change his or her beneficiary hereunder only by written notice to the Company, which change will become effective only upon receipt by the Company during the Participant’s lifetime.

9

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 quarterly report on Form 10-Q 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: May 10, 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 quarterly report on Form 10-Q 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: May 10, 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 Quarterly Report of W. R. Berkley Corporation (the “Company”) on Form 10-Q for the period ended March 31, 2016 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

May 10, 2016

A signed original of this written statement required by Section 906 has been provided to W. R. Berkley Corporation (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 - shares	3 Months Ended
	Mar. 31, 2016	May. 04, 2016
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-Q
Document Period End Date	Mar. 31, 2016
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding		122,602,882

XML

Consolidated Balance Sheet Consolidated Balance Sheet - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Assets [Abstract]
Fixed maturity securities	$ 12,745,436	$ 12,444,394
Loans receivable	141,699	150,866
Equity securities	384,519	376,697
Investment funds	1,179,310	1,170,040
Loans receivable	149,388	273,103
Real estate	986,810	936,367
Total investments	15,587,162	15,351,467
Cash and cash equivalents	837,515	763,631
Premiums and fees receivable	1,749,273	1,669,186
Due from reinsurers	1,558,749	1,532,829
Prepaid reinsurance premiums	429,058	394,387
Trading account receivables from brokers and clearing organizations	373,833	383,115
Deferred policy acquisition costs	547,519	513,128
Property, furniture and equipment	346,471	348,224
Federal and foreign income taxes	0	48,952
Goodwill	153,747	153,291
Accrued investment income	130,380	123,164
Other assets	517,227	442,782
Total assets	22,230,934	21,724,156
Liabilities:
Reserves for losses and loss expenses	10,788,342	10,669,150
Unearned premiums	3,314,676	3,137,133
Due to reinsurers	256,838	224,752
Trading account securities sold but not yet purchased	35,956	37,035
Deferred Tax Liabilities, Net, Current	31,291	0
Other liabilities	754,292	837,937
Subordinated debentures	446,485	340,320
Senior notes and other debt	1,814,998	1,844,621
Total liabilities	$ 17,442,878	$ 17,090,948
Equity:
Authorized 5,000,000 shares; issued and outstanding - none
Authorized 500,000,000 shares, issued and outstanding, net of treasury shares, 122,599,552 and 123,307,837 shares, respectively	$ 47,024	$ 47,024
Additional paid-in capital	1,013,572	1,005,455
Retained earnings	6,282,870	6,178,070
Accumulated other comprehensive income (loss)	8,124	(66,698)
Treasury stock, at cost, 112,518,366 and 111,810,081 shares, respectively	2,600,377	2,563,605
Total stockholders’ equity	4,751,213	4,600,246
Noncontrolling interests	36,843	32,962
Total equity	4,788,056	4,633,208
Total liabilities and equity	$ 22,230,934	$ 21,724,156

XML

Consolidated Balance Sheet Consolidated Balance Sheet (Parenthetical) - $ / shares	Mar. 31, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Preferred stock, par value $.10 per share:	$ 0.1	$ 0.1
Preferred shares authorized	5,000,000	5,000,000
Preferred shares issued	0	0
Preferred shares outstanding	0	0
Common stock, par value $.20 per share:	$ 0.2	$ 0.2
Common shares authorized	500,000,000	500,000,000
Common shares issued	0	123,307,837
Common shares outstanding	0	123,307,837
Treasury stock issued at cost	0	111,810,081

XML

Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
REVENUES:
Net premiums written	$ 1,663,722	$ 1,575,402
Change in net unearned premiums	(136,387)	(103,389)
Net premiums earned	1,527,335	1,472,013
Net investment income	130,133	124,239
Insurance service fees	40,362	36,518
Net realized investment gains	25,457	19,044
Marketable Securities, Realized Loss, Other than Temporary Impairments, Amount	(18,114)	0
Revenues from non-insurance businesses	101,780	92,606
Other income	258	259
Total revenues	1,807,211	1,744,679
OPERATING COSTS AND EXPENSES:
Losses and loss expenses	922,321	900,708
Other operating costs and expenses	582,459	551,046
Expenses from non-insurance businesses	95,531	89,670
Interest expense	32,224	34,538
Total operating costs and expenses	1,632,535	1,575,962
Income before income taxes	174,676	168,717
Income tax expense	(54,428)	(50,273)
Net income before noncontrolling interests	120,248	118,444
Noncontrolling interests	(737)	(137)
Net income to common stockholders	$ 119,511	$ 118,307
NET INCOME PER SHARE:
Basic	$ 0.97	$ 0.94
Diluted	$ 0.93	$ 0.89

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Consolidated Statements of Comprehensive Income Statement - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Net income before noncontrolling interests	$ 120,248	$ 118,444
Other comprehensive income (loss):
Change in unrealized currency translation adjustments	(2,047)	(47,805)
Change in unrealized investment gains, net of taxes	76,855	16,291
Other comprehensive income (loss)	74,808	(31,514)
Comprehensive income	195,056	86,930
Comprehensive (income) to the noncontrolling interest	(723)	(115)
Comprehensive income to common stockholders	$ 194,333	$ 86,815

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Consolidated Statements of Stockholders' Equity Statement - USD ($) $ in Thousands	Total	Common stocks	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]	Accumulated Translation Adjustment [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Noncontrolling Interest [Member]
Beginning and end of period at Dec. 31, 2014		$ 47,024	$ 991,512	$ 5,732,410	$ 306,199	$ (122,649)		$ (2,364,551)	$ 34,189
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock options exercised and restricted stock units issued including tax benefit			(1,678)
Restricted stock units expensed			8,171
Net income before noncontrolling interests	$ 118,444			118,307					137
Dividends				(13,749)
Change in unrealized investment gains, net of taxes	16,291				16,308
Unrealized gains (losses) on other-than-temporarily impaired securities					5
Change in unrealized currency translation adjustments	(47,805)					(47,805)
Stock exercised/vested								331
Stock repurchased								(91,213)
Contributions									111
Other comprehensive income (loss)	(31,514)					(47,805)	$ (31,514)		(22)
End of period at Mar. 31, 2015			998,005	5,836,968	322,512	(170,454)	152,058	(2,455,433)	34,415
Beginning and end of period at Dec. 31, 2015	4,633,208	$ 47,024	1,005,455	6,178,070	180,695	(247,393)		(2,563,605)	32,962
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock options exercised and restricted stock units issued including tax benefit			(652)
Restricted stock units expensed			8,769
Net income before noncontrolling interests	120,248			119,511					737
Dividends				(14,711)
Change in unrealized investment gains, net of taxes	76,855				76,904
Unrealized gains (losses) on other-than-temporarily impaired securities					(35)
Change in unrealized currency translation adjustments	(2,047)					(2,047)
Stock exercised/vested								652
Stock repurchased								(37,424)
Contributions									3,158
Other comprehensive income (loss)	74,808					(2,047)	74,808		(14)
End of period at Mar. 31, 2016	$ 4,788,056		$ 1,013,572	$ 6,282,870	$ 257,564	$ (249,440)	$ 8,124	$ (2,600,377)	$ 36,843

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Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
CASH FROM (USED IN) OPERATING ACTIVITIES:
Net income to common stockholders	$ 119,511	$ 118,307
Adjustments to reconcile net income to net cash from operating activities:
Net investment gains	(7,343)	(19,044)
Depreciation and amortization	30,245	19,203
Noncontrolling interests	737	137
Investment funds	(16,636)	(6,061)
Stock incentive plans	8,766	8,171
Change in:
Arbitrage trading account	383	7,692
Premiums and fees receivable	(79,531)	(71,181)
Reinsurance accounts	(26,319)	(46,260)
Deferred policy acquisition costs	(33,466)	(21,314)
Income taxes	46,780	44,618
Reserves for losses and loss expenses	108,057	152,925
Unearned premiums	171,553	117,403
Other	(181,969)	(243,584)
Net cash from operating activities	140,768	61,012
CASH FROM (USED IN) INVESTING ACTIVITIES:
Proceeds from sale of fixed maturity securities	381,732	466,276
Proceeds from sale of equity securities	1,880	9,785
Distributions from investment funds	15,788	(9,363)
Proceeds from maturities and prepayments of fixed maturity securities	455,463	655,349
Purchase of fixed maturity securities	(1,032,129)	(1,094,439)
Purchase of equity securities	(1,108)	(8,882)
Real estate purchased	(53,781)	(44,162)
Change in loans receivable	123,737	41,244
Net additions to property, furniture and equipment	(12,461)	(7,680)
Change in balances due to security brokers	69,642	(2,652)
Payment for business purchased net of cash aquired	(54,313)	0
Net cash from (used in) investing activities	(105,550)	5,476
CASH FROM (USED IN) FINANCING ACTIVITIES:
Repayment of senior notes and other debt	(33,721)	(3,240)
Proceeds from Issuance of Debt	110,093	0
Cash dividends to common stockholders	(14,711)	(13,749)
Purchase of common treasury shares	(37,424)	(91,213)
Other, net	3,158	(1,187)
Net cash from (used in) financing activities	27,395	(109,389)
Net impact on cash due to change in foreign exchange rates	11,271	(16,845)
Net increase (decrease) in cash and cash equivalents	73,884	(59,746)
Cash and cash equivalents at beginning of year	763,631	674,441
Cash and cash equivalents at end of period	$ 837,515	$ 614,695

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General General

3 Months Ended

Mar. 31, 2016

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]

General

The unaudited 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”) for interim financial information. Accordingly, they do not include all the information and notes required by GAAP for annual financial statements. The unaudited consolidated financial statements reflect all adjustments, consisting only of normal recurring items, which are necessary to present fairly the Company’s financial position and results of operations on a basis consistent with the prior audited consolidated financial statements. Operating results for interim periods are not necessarily indicative of the results that may be expected for the year. All significant intercompany accounts and transactions have been eliminated. 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. For further information related to a description of areas of judgment and estimates and other information necessary to understand the Company’s financial position and results of operations, refer to the audited consolidated financial statements and notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2015. Reclassifications have been made in the 2015 financial statements as originally reported to conform to the presentation of the 2016 financial statements.

The income tax provision has been computed based on the Company’s estimated annual effective tax rate. The effective tax rate for the quarter differs from the federal income tax rate of 35% principally because of tax-exempt investment income.

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Per Share Data Per Share Data

3 Months Ended

Mar. 31, 2016

Earnings Per Share [Abstract]

Earnings Per Share

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 the weighted average number of common shares outstanding during the period. Diluted EPS is based upon the weighted average number of common and common equivalent shares outstanding during the period 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.

The weighted average number of common shares used in the computation of basic and diluted earnings per share was as follows:

	For the Three Months
	Ended March 31,
(In thousands)	2016	2015
Basic	122,780	125,969
Diluted	128,529	132,484

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Recent Accounting Pronouncements Recent Accounting Pronouncements

3 Months Ended

Mar. 31, 2016

Accounting Policies [Abstract]

Recent Accounting Pronouncements

Recent Accounting Pronouncements

In February 2015, the Financial Accounting Standards Board ("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 Company adopted this updated guidance on January 1, 2016. This adoption did not have a material effect on the Company's financial condition or results of operations, but did 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 are disclosure only, the adoption of this guidance will not impact our financial condition or results of operations.

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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Acquistions Acquisitions

3 Months Ended

Mar. 31, 2016

Business Combinations [Abstract]

Business Combination Disclosure

Acquisitions/Dispositions

In February 2016, the Company acquired an 85% ownership interest for $42.3 million in a company engaged in the distribution of promotional merchandise. The fair value of the assets acquired and liabilities assumed have been estimated based on a preliminary valuation. The fair values of the assets and liabilities will be adjusted, as needed, following completion of the final valuation.

The following table summarizes the initial estimated fair value of net assets acquired and liabilities assumed for the business combination completed in 2016:

(In thousands)	2016
Cash and cash equivalents	$	1,072
Real estate, furniture and equipment	701
Goodwill and other intangibles assets	40,282
Premiums and service fees receivable	3,845
Other assets	5,166
Total assets acquired	51,066
Other liabilities assumed	(4,931		)
Noncontrolling interest	(3,850		)
Net assets acquired	$	42,285

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Statements of Comprehensive Income (Loss) Statements of Comprehensive Income (Loss) (Notes)

3 Months Ended

Mar. 31, 2016

Equity [Abstract]

Comprehensive Income (Loss)

Statement of Comprehensive Income (Loss)

The following table presents the components of the changes in accumulated other comprehensive income (loss) ("AOCI"):

(In thousands)	Unrealized Investment Gains (Losses)				Currency Translation Adjustments			Accumulated Other Comprehensive Income (Loss)
As of and for the three months ended March 31, 2016:
Changes in AOCI
Beginning of period	$	180,695			$	(247,393	)	$	(66,698	)
Other comprehensive income (loss) before reclassifications	78,242				(2,047		)	76,195
Amounts reclassified from AOCI	(1,387		)		—			(1,387		)
Other comprehensive income (loss)	76,855				(2,047		)	74,808
Unrealized investment gain related to non-controlling interest	14				—			14
End of period	$	257,564			$	(249,440	)	$	8,124
Amounts reclassified from AOCI
Pre-tax	$	(2,134	)	(1)	$	—		$	(2,134	)
Tax effect	747			(2)	—			747
After-tax amounts reclassified	$	(1,387	)		$	—		$	(1,387	)
Other comprehensive income (loss)
Pre-tax	$	114,390			$	(2,047	)	$	112,343
Tax effect	(37,535		)		—			(37,535		)
Other comprehensive income (loss)	$	76,855			$	(2,047	)	$	74,808
As of and for the three months ended March 31, 2015:
Changes in AOCI
Beginning of period	$	306,199			$	(122,649	)	$	183,550
Other comprehensive income (loss) before reclassifications	24,592				(47,805		)	(23,213		)
Amounts reclassified from AOCI	(8,301		)		—			(8,301		)
Other comprehensive income (loss)	16,291				(47,805		)	(31,514		)
Unrealized investment gain related to non-controlling interest	22				—			22
End of period	$	322,512			$	(170,454	)	$	152,058
Amounts reclassified from AOCI
Pre-tax	$	(12,771	)	(1)	$	—		$	(12,771	)
Tax effect	4,470			(2)	—			4,470
After-tax amounts reclassified	$	(8,301	)		$	—		$	(8,301	)
Other comprehensive income (loss)
Pre-tax	$	24,536			$	(47,805	)	$	(23,269	)
Tax effect	(8,245		)		—			(8,245		)
Other comprehensive income (loss)	$	16,291			$	(47,805	)	$	(31,514	)

_______________

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

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

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Statements of Cash Flow Statements of Cash Flow

3 Months Ended

Mar. 31, 2016

Supplemental Cash Flow Elements [Abstract]

Cash Flow, Supplemental Disclosures

Statements of Cash Flow

Interest payments were $56,968,000 and $56,632,000 and income taxes paid were $5,644,000 and $4,769,000 in the three months ended March 31, 2016 and 2015, respectively.

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Investments In Fixed Maturity Securities

3 Months Ended

Mar. 31, 2016

Debt Securities [Member]

Schedule of Marketable Securities [Line Items]

Investments In Fixed Maturity Securities

Investments in Fixed Maturity Securities

At March 31, 2016 and December 31, 2015, investments in fixed maturity securities were as follows:

(In thousands)	Amortized Cost		Gross Unrealized					Fair Value		Carrying Value
			Gains		Losses
March 31, 2016
Held to maturity:
State and municipal	$	78,264	$	17,340	$	—		$	95,604	$	78,264
Residential mortgage-backed	18,405		2,470		—			20,875		18,405
Total held to maturity	96,669		19,810		—			116,479		96,669
Available for sale:
U.S. government and government agency	571,330		27,602		(981		)	597,951		597,951
State and municipal:
Special revenue	2,613,723		120,174		(2,047		)	2,731,850		2,731,850
State general obligation	595,465		30,624		(1,817		)	624,272		624,272
Pre-refunded	407,586		32,630		—			440,216		440,216
Corporate backed	388,408		15,034		(618		)	402,824		402,824
Local general obligation	356,266		29,357		(17		)	385,606		385,606
Total state and municipal	4,361,448		227,819		(4,499		)	4,584,768		4,584,768
Mortgage-backed securities:
Residential (1)	1,067,877		27,520		(5,548		)	1,089,849		1,089,849
Commercial	65,138		778		(616		)	65,300		65,300
Total mortgage-backed securities	1,133,015		28,298		(6,164		)	1,155,149		1,155,149
Asset-backed	1,855,301		11,949		(22,846		)	1,844,404		1,844,404
Corporate:
Industrial	2,007,460		106,650		(20,538		)	2,093,572		2,093,572
Financial	1,176,238		39,566		(13,664		)	1,202,140		1,202,140
Utilities	197,336		10,771		(1,958		)	206,149		206,149
Other	66,289		426		—			66,715		66,715
Total corporate	3,447,323		157,413		(36,160		)	3,568,576		3,568,576
Foreign	849,800		54,580		(6,461		)	897,919		897,919
Total available for sale	12,218,217		507,661		(77,111		)	12,648,767		12,648,767
Total investments in fixed maturity securities	$	12,314,886	$	527,471	$	(77,111	)	$	12,765,246	$	12,745,436

(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
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	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

____________

(1) Gross unrealized losses for residential mortgage-backed securities include $1,324,214 and $1,269,491 as of March 31, 2016 and December 31, 2015, respectively, related to the non-credit portion of other-than-temporary impairments (“OTTI”) recognized in accumulated other comprehensive income.

The amortized cost and fair value of fixed maturity securities at March 31, 2016, 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	$	812,491	$	822,851
Due after one year through five years	4,360,294		4,522,431
Due after five years through ten years	3,482,275		3,659,124
Due after ten years	2,508,406		2,584,816
Mortgage-backed securities	1,151,420		1,176,024
Total	$	12,314,886	$	12,765,246

At March 31, 2016 and 2015, there were no investments that exceeded 10% of common stockholder's equity, other than investments in United States government and government agency securities.

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Investments in Equity Securities

3 Months Ended

Mar. 31, 2016

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 March 31, 2016 and December 31, 2015, investments in equity securities were as follows:

(In thousands)	Cost		Gross Unrealized					Fair Value		Carrying Value
			Gains		Losses
March 31, 2016
Common stocks	$	38,686	$	424	$	(1,539	)	$	37,571	$	37,571
Preferred stocks	106,990		7,582		(10,444		)	104,128		104,128
Total	$	145,676	$	8,006	$	(11,983	)	$	141,699	$	141,699
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

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Arbitrage Trading Account Arbitrage Trading Account (Notes)

3 Months Ended

Mar. 31, 2016

Schedule of Investments [Abstract]

Arbitrage Trading Account and Arbitrage Funds [Text Block]

Arbitrage Trading Account

At March 31, 2016 and December 31, 2015, the fair and carrying values of the arbitrage trading account were $385 million and $377 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 March 31, 2016, the fair value of long option contracts outstanding was $0.5 million (notional amount of $6.7 million) and the fair value of short option contracts outstanding was $0.4 million (notional amount of $12.7 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 Net Investment Income

3 Months Ended

Mar. 31, 2016

Income Statement [Abstract]

Net Investment Income

Net Investment Income

Net investment income consists of the following:

	For the Three Months
	Ended March 31,
(In thousands)	2016			2015
Investment income earned on:
Fixed maturity securities, including cash and cash equivalents and loans receivable	$	108,835		$	108,129
Investment funds	16,636			6,061
Arbitrage trading account	3,190			8,979
Equity securities available for sale	868			1,180
Real estate	2,717			2,767
Gross investment income	132,246			127,116
Investment expense	(2,113		)	(2,877		)
Net investment income	$	130,133		$	124,239

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Investment Funds Investment Funds

3 Months Ended

Mar. 31, 2016

Equity Method Investments and Joint Ventures [Abstract]

Net Investment Income

Investment Funds

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

The Company’s maximum exposure to loss with respect to these investments is limited to the carrying amount reported on the Company’s consolidated balance sheet and any unfunded commitment.

Investment funds consist of the following:

	Carrying Value as of				Income (Loss) from Investment Funds
	March 31,		December 31,		Three months ended March 31,
(In thousands)	2016		2015		2016			2015
Real estate	$	597,380	$	580,830	$	17,037		$	26,012
Energy	95,849		93,719		(3,924		)	(21,868		)
Hedge equity	67,728		70,580		(2,852		)	(873		)
Other funds	418,353		424,911		6,375			2,790
Total	$	1,179,310	$	1,170,040	$	16,636		$	6,061

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

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 March 31, 2016 is approximately 21% with a fair value of $295.3 million and a carrying value of $46.3 million.

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Real Estate Real Estate

3 Months Ended

Mar. 31, 2016

Real Estate [Abstract]

Real Estate

Real Estate

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

	Carrying Value
	March 31,		December 31,
(In thousands)	2016		2015
Properties in operation	$	239,476	$	226,055
Properties under development	747,334		710,312
Total	$	986,810	$	936,367

In 2016, properties in operation included a long-term ground lease in Washington, D.C., a hotel in Memphis, Tennessee and office buildings in West Palm Beach and Palm Beach, Florida. Properties in operation are net of accumulated depreciation and amortization of $10,896,000 and $9,073,000 as of March 31, 2016 and December 31, 2015, respectively. Related depreciation expense was $1,668,000 and $2,543,000 for the three months ended March 31, 2016 and 2015, respectively. Future minimum rental income expected on operating leases relating to properties in operation is $9,614,350 in 2016, $15,791,035 in 2017, $14,793,678 in 2018, $11,822,103 in 2019, $9,830,091 in 2020, $9,591,819 in 2021 and $343,543,992 thereafter.

Properties under development include 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 Loans Receivable

3 Months Ended

Mar. 31, 2016

Receivables [Abstract]

Loans Receivable

Loans Receivable

Loans receivable are as follows:

(In thousands)	March 31, 2016		December 31, 2015
Amortized cost (net of valuation allowance):
Real estate loans	$	121,861	$	200,499
Commercial loans	27,527		72,604
Total	$	149,388	$	273,103
Fair value:
Real estate loans	$	124,393	$	201,641
Commercial loans	27,527		74,106
Total	$	151,920	$	275,747
Valuation allowance:
Specific	$	555	$	—
General	2,107		2,094
Total	$	2,662	$	2,094
	2016		2015
Increase (decrease) in valuation allowance	$	568	$	(47	)

Loans receivable in non-accrual status were $6.7 million and $3.1 million as of March 31, 2016 and December 31, 2015, respectively.

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

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

In evaluating the real estate loans, the Company considers their credit quality indicators, including loan to value ratios, which compare the outstanding loan amount to the estimated value of the property, the borrower’s financial condition and performance with respect to loan terms, the position in the capital structure, the overall leverage in the capital structure and other market conditions. Based on these considerations, none of the real estate loans were considered to be impaired at March 31, 2016, and accordingly, the Company determined that a specific valuation allowance was not required.

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Realized And Unrealized Investment Gains (Losses)

3 Months Ended

Mar. 31, 2016

Realized and Unrealized Investment Gains (Losses) [Abstract]

Realized and Unrealized Investment Gains (Losses)

Realized and Unrealized Investment Gains (Losses)

Realized and unrealized investment gains (losses) are as follows:

	For the Three Months Ended March 31,
(In thousands)	2016			2015
Realized investment gains (losses):
Fixed maturity securities:
Gains	$	23,064		$	4,146
Losses	(2,940		)	(1,077		)
Equity securities available for sale	125			9,702
Investment funds	(460		)	(1,511		)
Real estate	5,024			—
Other	644			7,784
Net realized gains on investments sales	25,457			19,044
Other-than-temporary impairments (1)	(18,114		)	—
Net investment gains	7,343			19,044
Income tax expense	(2,570		)	(6,665		)
After-tax net realized investment gains	$	4,773		$	12,379

Change in unrealized investment gains and losses of available for sale securities:
Fixed maturity securities	$	92,428		$	42,480
Previously impaired fixed maturity securities	(55		)	8
Equity securities available for sale	13,137			(6,845		)
Investment funds	8,880			(11,107		)
Total change in unrealized investment gains (losses)	114,390			24,536
Income tax benefit (expense)	(37,535		)	(8,245		)
Noncontrolling interests	14			22
After-tax change in unrealized investment gains and losses of available for sale securities	$	76,869		$	16,313

(1) Other than temporary impairments (OTTI) for the three months ended March 31, 2016 were $18.1 million related to common stock.

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Securities In An Unrealized Loss Position

3 Months Ended

Mar. 31, 2016

Investments [Abstract]

Securities in Unrealized Loss Position

Securities in an Unrealized Loss Position

The following tables summarize all securities in an unrealized loss position at March 31, 2016 and December 31, 2015 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
March 31, 2016
U.S. government and government agency	$	24,911	$	79	$	43,226	$	902	$	68,137	$	981
State and municipal	210,419		1,903		171,433		2,596		381,852		4,499
Mortgage-backed securities	135,022		1,748		155,445		4,416		290,467		6,164
Asset-backed securities	1,207,153		14,032		230,979		8,814		1,438,132		22,846
Corporate	362,296		25,162		79,582		10,998		441,878		36,160
Foreign	41,278		3,964		25,672		2,497		66,950		6,461
Fixed maturity securities	1,981,079		46,888		706,337		30,223		2,687,416		77,111
Common stocks	—		—		7,474		1,539		7,474		1,539
Preferred stocks	35,241		6,512		27,657		3,932		62,898		10,444
Equity securities available for sale	35,241		6,512		35,131		5,471		70,372		11,983
Total	$	2,016,320	$	53,400	$	741,468	$	35,694	$	2,757,788	$	89,094
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	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

Fixed Maturity Securities – A summary of the Company’s non-investment grade fixed maturity securities that were in an unrealized loss position at March 31, 2016 is presented in the table below:

($ in thousands)	Number of Securities	Aggregate Fair Value		Gross Unrealized Loss
Mortgage-backed securities	12	$	35,540	$	1,866
Asset-backed securities	7	26,322		261
Corporate	15	92,666		10,780
Foreign government	5	22,414		3,011
Total	39	$	176,942	$	15,918

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

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 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.

Preferred Stocks– At March 31, 2016, there were five preferred stocks in an unrealized loss position, with an aggregate fair value of $62.9 million and a gross unrealized loss of $10.4 million. Based upon management’s view of the underlying value of these securities, the Company does not consider these equity securities to be OTTI.

Common Stocks - At March 31, 2016, there was one common stock in an unrealized loss position, with a fair value of $7.5 million and a gross unrealized loss of $1.5 million. Based on management's view of the underlying security, the Company does not consider the equity security to be OTTI.

Loans Receivable – The Company monitors the performance of its loans receivable, including current market conditions for each loan and the ability to collect principal and interest. For loans where the Company determines it is probable that the contractual terms will not be met, an analysis is performed and a valuation reserve is established, if necessary, with a charge to earnings. Loans receivable are reported net of a valuation reserve of $3 million and $2 million at March 31, 2016 and December 31, 2015, respectively.

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Fair Value Measurements Fair Value Measurements

3 Months Ended

Mar. 31, 2016

Fair Value Disclosures [Abstract]

Fair Value Disclosures

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 March 31, 2016 and December 31, 2015 by level:

(In thousands)	Total		Level 1		Level 2		Level 3
March 31, 2016
Assets:
Fixed maturity securities available for sale:
U.S. government and government agency	$	597,951	$	—	$	597,951	$	—
State and municipal	4,584,768		—		4,584,768		—
Mortgage-backed securities	1,155,149		—		1,155,149		—
Asset-backed securities	1,844,404		—		1,844,207		197
Corporate	3,568,576		—		3,568,576		—
Foreign government	897,919		—		897,919		—
Total fixed maturity securities available for sale	12,648,767		—		12,648,570		197
Equity securities available for sale:
Common stocks	37,571		30,097		—		7,474
Preferred stocks	104,128		—		100,488		3,640
Total equity securities available for sale	141,699		30,097		100,488		11,114
Arbitrage trading account	384,519		244,647		139,742		130
Total	$	13,174,985	$	274,744	$	12,888,800	$	11,441
Liabilities:
Trading account securities sold but not yet purchased	$	35,956	$	35,956	$	—	$	—
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	$	—

There were no significant transfers between Levels 1 and 2 during the three months ended March 31, 2016 or during the year ended December 31, 2015.

The following tables summarize changes in Level 3 assets and liabilities for the three months ended March 31, 2016 and for the year ended December 31, 2015:

	Gains (Losses) Included in:
(In thousands)	Beginning Balance		Earnings (Losses)			Other Comprehensive Income (Loss)			Impairments			Purchases		(Sales)			Paydowns / Maturities			Transfers			Ending Balance
																				In / (Out)
Three months ended March 31, 2016
Assets:
Fixed maturities securities available for sale:
Asset-backed securities	$	199	$	1		$	1		$	—		$	—	$	—		$	(4	)	$	—		$	197
Corporate	154		177			—			—			—		(331		)	—			—			—
Total	353		178			1			—			—		(331		)	(4		)	—			197
Equity securities available for sale:
Common stocks	7,829		—			(355		)	—			—		—			—			—			7,474
Preferred stocks	3,624		16			—			—			—		—			—			—			3,640
Total	11,453		16			(355		)	—			—		—			—			—			11,114
Arbitrage trading account	176		(46		)	—			—			—		—			—			—			130
Total	$	11,982	$	148		$	(354	)	$	—		$	—	$	(331	)	$	(4	)	$	—		$	11,441
Year ended December 31, 2015:
Assets:
Fixed maturities 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

During the three months ended March 31, 2016, there were no transfers out of Level 3. During the year ended December 31, 2015, five securities were transferred out of Level 3 as an observable price became available.

Fair Value of Financial Instruments

The following table presents the carrying amounts and estimated fair values of the Company’s financial instruments:

	March 31, 2016				December 31, 2015
(In thousands)	Carrying Value		Fair Value		Carrying Value		Fair Value
Assets:
Fixed maturity securities	$	12,745,436	$	12,765,246	$	12,444,394	$	12,462,847
Equity securities available for sale	141,699		141,699		150,866		150,866
Arbitrage trading account	384,519		384,519		376,697		376,697
Loans receivable	149,388		151,920		273,103		275,747
Cash and cash equivalents	837,515		837,515		763,631		763,631
Trading account receivables from brokers and clearing organizations	373,833		373,833		383,115		383,115
Due from broker	—		—		1,713		1,713
Liabilities:
Due to broker	71,024		71,024		—		—
Trading account securities sold but not yet purchased	35,956		35,956		37,035		37,035
Subordinated debentures	446,485		462,256		340,320		355,880
Senior notes and other debt	1,814,998		2,018,282		1,844,621		2,029,572

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 16 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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Reinsurance Reinsurance

3 Months Ended

Mar. 31, 2016

Insurance [Abstract]

Reinsurance [Text Block]

Reinsurance

The following is a summary of reinsurance financial information:

	For the Three Months
	Ended March 31,
(In thousands)	2016			2015
Written premiums:
Direct	$	1,709,129		$	1,647,341
Assumed	246,568			204,464
Ceded	(291,975		)	(276,403		)
Total net premiums written	$	1,663,722		$	1,575,402
Earned premiums:
Direct	$	1,568,067		$	1,524,736
Assumed	218,367			203,342
Ceded	(259,099		)	(256,065		)
Total net premiums earned	$	1,527,335		$	1,472,013
Ceded losses and loss expenses incurred	$	126,929		$	118,391
Ceded commissions earned	$	47,973		$	43,651

The Company reinsures a portion of its insurance exposures in order to reduce its net liability on individual risks and catastrophe losses. The Company also cedes premiums to state assigned risk plans and captive insurance companies. Estimated amounts due from reinsurers are reported net of reserves for uncollectible reinsurance of $1 million as of March 31, 2016 and December 31, 2015.

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Fair Value Of Financial Instruments Fair Value of Financial Instruments (Notes)

3 Months Ended

Mar. 31, 2016

Fair Value Disclosures [Abstract]

Fair Value Disclosures

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 March 31, 2016 and December 31, 2015 by level:

(In thousands)	Total		Level 1		Level 2		Level 3
March 31, 2016
Assets:
Fixed maturity securities available for sale:
U.S. government and government agency	$	597,951	$	—	$	597,951	$	—
State and municipal	4,584,768		—		4,584,768		—
Mortgage-backed securities	1,155,149		—		1,155,149		—
Asset-backed securities	1,844,404		—		1,844,207		197
Corporate	3,568,576		—		3,568,576		—
Foreign government	897,919		—		897,919		—
Total fixed maturity securities available for sale	12,648,767		—		12,648,570		197
Equity securities available for sale:
Common stocks	37,571		30,097		—		7,474
Preferred stocks	104,128		—		100,488		3,640
Total equity securities available for sale	141,699		30,097		100,488		11,114
Arbitrage trading account	384,519		244,647		139,742		130
Total	$	13,174,985	$	274,744	$	12,888,800	$	11,441
Liabilities:
Trading account securities sold but not yet purchased	$	35,956	$	35,956	$	—	$	—
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	$	—

There were no significant transfers between Levels 1 and 2 during the three months ended March 31, 2016 or during the year ended December 31, 2015.

The following tables summarize changes in Level 3 assets and liabilities for the three months ended March 31, 2016 and for the year ended December 31, 2015:

	Gains (Losses) Included in:
(In thousands)	Beginning Balance		Earnings (Losses)			Other Comprehensive Income (Loss)			Impairments			Purchases		(Sales)			Paydowns / Maturities			Transfers			Ending Balance
																				In / (Out)
Three months ended March 31, 2016
Assets:
Fixed maturities securities available for sale:
Asset-backed securities	$	199	$	1		$	1		$	—		$	—	$	—		$	(4	)	$	—		$	197
Corporate	154		177			—			—			—		(331		)	—			—			—
Total	353		178			1			—			—		(331		)	(4		)	—			197
Equity securities available for sale:
Common stocks	7,829		—			(355		)	—			—		—			—			—			7,474
Preferred stocks	3,624		16			—			—			—		—			—			—			3,640
Total	11,453		16			(355		)	—			—		—			—			—			11,114
Arbitrage trading account	176		(46		)	—			—			—		—			—			—			130
Total	$	11,982	$	148		$	(354	)	$	—		$	—	$	(331	)	$	(4	)	$	—		$	11,441
Year ended December 31, 2015:
Assets:
Fixed maturities 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

During the three months ended March 31, 2016, there were no transfers out of Level 3. During the year ended December 31, 2015, five securities were transferred out of Level 3 as an observable price became available.

Fair Value of Financial Instruments

The following table presents the carrying amounts and estimated fair values of the Company’s financial instruments:

	March 31, 2016				December 31, 2015
(In thousands)	Carrying Value		Fair Value		Carrying Value		Fair Value
Assets:
Fixed maturity securities	$	12,745,436	$	12,765,246	$	12,444,394	$	12,462,847
Equity securities available for sale	141,699		141,699		150,866		150,866
Arbitrage trading account	384,519		384,519		376,697		376,697
Loans receivable	149,388		151,920		273,103		275,747
Cash and cash equivalents	837,515		837,515		763,631		763,631
Trading account receivables from brokers and clearing organizations	373,833		373,833		383,115		383,115
Due from broker	—		—		1,713		1,713
Liabilities:
Due to broker	71,024		71,024		—		—
Trading account securities sold but not yet purchased	35,956		35,956		37,035		37,035
Subordinated debentures	446,485		462,256		340,320		355,880
Senior notes and other debt	1,814,998		2,018,282		1,844,621		2,029,572

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 16 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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Restricted Stock Units Restricted Stock Units (Notes)

3 Months Ended

Mar. 31, 2016

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

Restricted Stock Units

Restricted Stock Units

Pursuant to its 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. RSUs are expensed pro-ratably over the vesting period. RSU expenses were $9 million and $8 million for the three months ended March 31, 2016 and 2015, respectively. A summary of RSUs issued in the three months ended March 31, 2016 and 2015 follows:

($ in thousands)	Units	Fair Value
Three months ended March 31,
2016	5,580	$	286
2015	10,000	$	503

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Litigation and Contingent Liabilities Litigation and Contingent Liabilities

3 Months Ended

Mar. 31, 2016

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies Disclosure [Text Block]

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.

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Industry Segments

3 Months Ended

Mar. 31, 2016

Segment Reporting [Abstract]

Industry Segments

Segments

The Company’s reportable segments include the following two business segments:

• Insurance - primarily commercial insurance business, including excess and surplus lines and admitted lines in the United States, United Kingdom, Continental Europe, South America, Canada, Scandinavia, Asia and Australia; and

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

Commencing with the first quarter of 2016, the Company changed the aggregation of its business segments. Insurance-Domestic operating units and Insurance-International operating units, previously reported separately, have been aggregated into the Insurance segment. The segment disclosures for prior periods have been revised to be consistent with the new reportable business segment presentation. The segment disclosures for the years ended December 31, 2015, 2014 and 2013, and as of December 31, 2015 and 2014, have also been included herein, revised for the new reportable business segment presentation.

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 tables. 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) to Common Stockholders
Three months ended March 31, 2016:
Insurance	$	1,375,358	$	105,229	$	26,793	$	1,507,380	$	205,915		$	139,270
Reinsurance	151,977		18,401		—		170,378		21,797			15,117
Corporate, other and eliminations (1)	—		6,503		115,607		122,110		(60,379		)	(39,649		)
Net investment gains	—		—		7,343		7,343		7,343			4,773
Consolidated	$	1,527,335	$	130,133	$	149,743	$	1,807,211	$	174,676		$	119,511
Three months ended March 31, 2015:
Insurance	$	1,311,276	$	99,084	$	25,575	$	1,435,935	$	188,169		$	130,039
Reinsurance	160,737		17,041		—		177,778		20,262			14,500
Corporate, other and eliminations (1)	—		8,114		103,808		111,922		(58,758		)	(38,611		)
Net investment gains	—		—		19,044		19,044		19,044			12,379
Consolidated	$	1,472,013	$	124,239	$	148,427	$	1,744,679	$	168,717		$	118,307
Twelve months ended December 31, 2015:
Insurance	$	5,431,500	$	410,457	$	96,487	$	5,938,444	$	776,593		$	532,286
Reinsurance	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
Twelve months ended December 31, 2014
Insurance	$	5,074,308	$	484,039	$	106,853	$	5,665,200	$	826,088		$	561,643
Reinsurance	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
Twelve months ended December 31, 2013
Insurance	$	4,505,567	$	451,319	$	107,517	$	5,064,403	$	705,662		$	490,273
Reinsurance	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

________

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

Identifiable Assets

(In thousands)	March 31, 2016		December 31, 2015		December 31, 2014
Insurance	$	18,232,365	$	18,063,730	$	17,944,847
Reinsurance	2,595,231		2,441,340		2,713,554
Corporate, other and eliminations	1,403,338		1,219,086		1,058,290
Consolidated	$	22,230,934	$	21,724,156	$	21,716,691

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

	For the Three Months
	Ended March 31,
(In thousands)	2016		2015
Insurance:
Other liability	$	422,956	$	396,904
Workers’ compensation	345,503		314,738
Short-tail lines	331,857		323,090
Commercial automobile	156,817		165,560
Professional liability	118,225		110,984
Total Insurance	1,375,358		1,311,276
Reinsurance:
Casualty	100,334		112,816
Property	51,643		47,921
Total Reinsurance	151,977		160,737
Total	$	1,527,335	$	1,472,013

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Per Share Data (Tables)

3 Months Ended

Mar. 31, 2016

Earnings Per Share [Abstract]

Schedule of Weighted Average Number of Shares [Table Text Block]

The weighted average number of common shares used in the computation of basic and diluted earnings per share was as follows:

	For the Three Months
	Ended March 31,
(In thousands)	2016	2015
Basic	122,780	125,969
Diluted	128,529	132,484

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Acquistions Acquisitions (Tables)

3 Months Ended

Mar. 31, 2016

Business Combinations [Abstract]

Summary of fair value of net assets acquired and liabilities assumed

The following table summarizes the initial estimated fair value of net assets acquired and liabilities assumed for the business combination completed in 2016:

(In thousands)	2016
Cash and cash equivalents	$	1,072
Real estate, furniture and equipment	701
Goodwill and other intangibles assets	40,282
Premiums and service fees receivable	3,845
Other assets	5,166
Total assets acquired	51,066
Other liabilities assumed	(4,931		)
Noncontrolling interest	(3,850		)
Net assets acquired	$	42,285

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Statements of Comprehensive Income (Loss) Statements of Comprehensive Income (Loss) (Tables)

3 Months Ended

Mar. 31, 2015

Equity [Abstract]

Components of changes in accumulated other comprehensive income (loss)

The following table presents the components of the changes in accumulated other comprehensive income (loss) ("AOCI"):

(In thousands)	Unrealized Investment Gains (Losses)				Currency Translation Adjustments			Accumulated Other Comprehensive Income (Loss)
As of and for the three months ended March 31, 2016:
Changes in AOCI
Beginning of period	$	180,695			$	(247,393	)	$	(66,698	)
Other comprehensive income (loss) before reclassifications	78,242				(2,047		)	76,195
Amounts reclassified from AOCI	(1,387		)		—			(1,387		)
Other comprehensive income (loss)	76,855				(2,047		)	74,808
Unrealized investment gain related to non-controlling interest	14				—			14
End of period	$	257,564			$	(249,440	)	$	8,124
Amounts reclassified from AOCI
Pre-tax	$	(2,134	)	(1)	$	—		$	(2,134	)
Tax effect	747			(2)	—			747
After-tax amounts reclassified	$	(1,387	)		$	—		$	(1,387	)
Other comprehensive income (loss)
Pre-tax	$	114,390			$	(2,047	)	$	112,343
Tax effect	(37,535		)		—			(37,535		)
Other comprehensive income (loss)	$	76,855			$	(2,047	)	$	74,808
As of and for the three months ended March 31, 2015:
Changes in AOCI
Beginning of period	$	306,199			$	(122,649	)	$	183,550
Other comprehensive income (loss) before reclassifications	24,592				(47,805		)	(23,213		)
Amounts reclassified from AOCI	(8,301		)		—			(8,301		)
Other comprehensive income (loss)	16,291				(47,805		)	(31,514		)
Unrealized investment gain related to non-controlling interest	22				—			22
End of period	$	322,512			$	(170,454	)	$	152,058
Amounts reclassified from AOCI
Pre-tax	$	(12,771	)	(1)	$	—		$	(12,771	)
Tax effect	4,470			(2)	—			4,470
After-tax amounts reclassified	$	(8,301	)		$	—		$	(8,301	)
Other comprehensive income (loss)
Pre-tax	$	24,536			$	(47,805	)	$	(23,269	)
Tax effect	(8,245		)		—			(8,245		)
Other comprehensive income (loss)	$	16,291			$	(47,805	)	$	(31,514	)

_______________

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

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

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Investments In Fixed Maturity Securities Investments in Fixed Maturity Securities (Tables)

3 Months Ended

Mar. 31, 2016

Schedule of Marketable Securities [Line Items]

Amortized cost and fair value of fixed maturity securities by contractual maturity

The amortized cost and fair value of fixed maturity securities at March 31, 2016, 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	$	812,491	$	822,851
Due after one year through five years	4,360,294		4,522,431
Due after five years through ten years	3,482,275		3,659,124
Due after ten years	2,508,406		2,584,816
Mortgage-backed securities	1,151,420		1,176,024
Total	$	12,314,886	$	12,765,246

Debt Securities [Member]

Schedule of Marketable Securities [Line Items]

Schedule of investments in fixed maturity securities

At March 31, 2016 and December 31, 2015, investments in fixed maturity securities were as follows:

(In thousands)	Amortized Cost		Gross Unrealized					Fair Value		Carrying Value
			Gains		Losses
March 31, 2016
Held to maturity:
State and municipal	$	78,264	$	17,340	$	—		$	95,604	$	78,264
Residential mortgage-backed	18,405		2,470		—			20,875		18,405
Total held to maturity	96,669		19,810		—			116,479		96,669
Available for sale:
U.S. government and government agency	571,330		27,602		(981		)	597,951		597,951
State and municipal:
Special revenue	2,613,723		120,174		(2,047		)	2,731,850		2,731,850
State general obligation	595,465		30,624		(1,817		)	624,272		624,272
Pre-refunded	407,586		32,630		—			440,216		440,216
Corporate backed	388,408		15,034		(618		)	402,824		402,824
Local general obligation	356,266		29,357		(17		)	385,606		385,606
Total state and municipal	4,361,448		227,819		(4,499		)	4,584,768		4,584,768
Mortgage-backed securities:
Residential (1)	1,067,877		27,520		(5,548		)	1,089,849		1,089,849
Commercial	65,138		778		(616		)	65,300		65,300
Total mortgage-backed securities	1,133,015		28,298		(6,164		)	1,155,149		1,155,149
Asset-backed	1,855,301		11,949		(22,846		)	1,844,404		1,844,404
Corporate:
Industrial	2,007,460		106,650		(20,538		)	2,093,572		2,093,572
Financial	1,176,238		39,566		(13,664		)	1,202,140		1,202,140
Utilities	197,336		10,771		(1,958		)	206,149		206,149
Other	66,289		426		—			66,715		66,715
Total corporate	3,447,323		157,413		(36,160		)	3,568,576		3,568,576
Foreign	849,800		54,580		(6,461		)	897,919		897,919
Total available for sale	12,218,217		507,661		(77,111		)	12,648,767		12,648,767
Total investments in fixed maturity securities	$	12,314,886	$	527,471	$	(77,111	)	$	12,765,246	$	12,745,436

(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
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	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

____________

(1) Gross unrealized losses for residential mortgage-backed securities include $1,324,214 and $1,269,491 as of March 31, 2016 and December 31, 2015, respectively, related to the non-credit portion of other-than-temporary impairments (“OTTI”) recognized in accumulated other comprehensive income.

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Investments in Equity Securities Investments in Equity Securities (Tables)

3 Months Ended

Mar. 31, 2016

Equity securities available for sale

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

Schedule of Investments in Equity Securities

At March 31, 2016 and December 31, 2015, investments in equity securities were as follows:

(In thousands)	Cost		Gross Unrealized					Fair Value		Carrying Value
			Gains		Losses
March 31, 2016
Common stocks	$	38,686	$	424	$	(1,539	)	$	37,571	$	37,571
Preferred stocks	106,990		7,582		(10,444		)	104,128		104,128
Total	$	145,676	$	8,006	$	(11,983	)	$	141,699	$	141,699
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

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Net Investment Income (Tables)

3 Months Ended

Mar. 31, 2016

Net Investment Income [Abstract]

Schedule of Net Investment Income

Net investment income consists of the following:

	For the Three Months
	Ended March 31,
(In thousands)	2016			2015
Investment income earned on:
Fixed maturity securities, including cash and cash equivalents and loans receivable	$	108,835		$	108,129
Investment funds	16,636			6,061
Arbitrage trading account	3,190			8,979
Equity securities available for sale	868			1,180
Real estate	2,717			2,767
Gross investment income	132,246			127,116
Investment expense	(2,113		)	(2,877		)
Net investment income	$	130,133		$	124,239

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Investment Funds Investment Funds (Tables)

3 Months Ended

Mar. 31, 2016

Equity Method Investments and Joint Ventures [Abstract]

Schedule of Net Investment Funds

Investment funds consist of the following:

	Carrying Value as of				Income (Loss) from Investment Funds
	March 31,		December 31,		Three months ended March 31,
(In thousands)	2016		2015		2016			2015
Real estate	$	597,380	$	580,830	$	17,037		$	26,012
Energy	95,849		93,719		(3,924		)	(21,868		)
Hedge equity	67,728		70,580		(2,852		)	(873		)
Other funds	418,353		424,911		6,375			2,790
Total	$	1,179,310	$	1,170,040	$	16,636		$	6,061

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Real Estate Real Estate (Tables)

3 Months Ended

Mar. 31, 2016

Real Estate [Abstract]

Schedule of Real Estate Investments

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

	Carrying Value
	March 31,		December 31,
(In thousands)	2016		2015
Properties in operation	$	239,476	$	226,055
Properties under development	747,334		710,312
Total	$	986,810	$	936,367

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Loans Receivable Loans Receivable (Tables)

3 Months Ended

Mar. 31, 2016

Receivables [Abstract]

Schedule of Loans Receivable

Loans receivable are as follows:

(In thousands)	March 31, 2016		December 31, 2015
Amortized cost (net of valuation allowance):
Real estate loans	$	121,861	$	200,499
Commercial loans	27,527		72,604
Total	$	149,388	$	273,103
Fair value:
Real estate loans	$	124,393	$	201,641
Commercial loans	27,527		74,106
Total	$	151,920	$	275,747
Valuation allowance:
Specific	$	555	$	—
General	2,107		2,094
Total	$	2,662	$	2,094
	2016		2015
Increase (decrease) in valuation allowance	$	568	$	(47	)

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Realized And Unrealized Investment Gains (Losses) (Tables)

3 Months Ended

Mar. 31, 2016

Realized and Unrealized Investment Gains (Losses) [Abstract]

Realized and Unrealized Investment Gains (Losses)

Realized and unrealized investment gains (losses) are as follows:

	For the Three Months Ended March 31,
(In thousands)	2016			2015
Realized investment gains (losses):
Fixed maturity securities:
Gains	$	23,064		$	4,146
Losses	(2,940		)	(1,077		)
Equity securities available for sale	125			9,702
Investment funds	(460		)	(1,511		)
Real estate	5,024			—
Other	644			7,784
Net realized gains on investments sales	25,457			19,044
Other-than-temporary impairments (1)	(18,114		)	—
Net investment gains	7,343			19,044
Income tax expense	(2,570		)	(6,665		)
After-tax net realized investment gains	$	4,773		$	12,379

Unrealized Gain (Loss) on Investments

Change in unrealized investment gains and losses of available for sale securities:
Fixed maturity securities	$	92,428		$	42,480
Previously impaired fixed maturity securities	(55		)	8
Equity securities available for sale	13,137			(6,845		)
Investment funds	8,880			(11,107		)
Total change in unrealized investment gains (losses)	114,390			24,536
Income tax benefit (expense)	(37,535		)	(8,245		)
Noncontrolling interests	14			22
After-tax change in unrealized investment gains and losses of available for sale securities	$	76,869		$	16,313

(1) Other than temporary impairments (OTTI) for the three months ended March 31, 2016 were $18.1 million related to common stock.

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Securities In An Unrealized Loss Position Securities In An Unrealized Loss Position (Tables)

3 Months Ended

Mar. 31, 2016

Statement of Financial Position [Abstract]

Securities in an unrealized loss position

The following tables summarize all securities in an unrealized loss position at March 31, 2016 and December 31, 2015 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
March 31, 2016
U.S. government and government agency	$	24,911	$	79	$	43,226	$	902	$	68,137	$	981
State and municipal	210,419		1,903		171,433		2,596		381,852		4,499
Mortgage-backed securities	135,022		1,748		155,445		4,416		290,467		6,164
Asset-backed securities	1,207,153		14,032		230,979		8,814		1,438,132		22,846
Corporate	362,296		25,162		79,582		10,998		441,878		36,160
Foreign	41,278		3,964		25,672		2,497		66,950		6,461
Fixed maturity securities	1,981,079		46,888		706,337		30,223		2,687,416		77,111
Common stocks	—		—		7,474		1,539		7,474		1,539
Preferred stocks	35,241		6,512		27,657		3,932		62,898		10,444
Equity securities available for sale	35,241		6,512		35,131		5,471		70,372		11,983
Total	$	2,016,320	$	53,400	$	741,468	$	35,694	$	2,757,788	$	89,094
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	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

Non-Investment Grade Fixed Maturity Securities

Fixed Maturity Securities – A summary of the Company’s non-investment grade fixed maturity securities that were in an unrealized loss position at March 31, 2016 is presented in the table below:

($ in thousands)	Number of Securities	Aggregate Fair Value		Gross Unrealized Loss
Mortgage-backed securities	12	$	35,540	$	1,866
Asset-backed securities	7	26,322		261
Corporate	15	92,666		10,780
Foreign government	5	22,414		3,011
Total	39	$	176,942	$	15,918

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Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2016

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

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 March 31, 2016 and December 31, 2015 by level:

(In thousands)	Total		Level 1		Level 2		Level 3
March 31, 2016
Assets:
Fixed maturity securities available for sale:
U.S. government and government agency	$	597,951	$	—	$	597,951	$	—
State and municipal	4,584,768		—		4,584,768		—
Mortgage-backed securities	1,155,149		—		1,155,149		—
Asset-backed securities	1,844,404		—		1,844,207		197
Corporate	3,568,576		—		3,568,576		—
Foreign government	897,919		—		897,919		—
Total fixed maturity securities available for sale	12,648,767		—		12,648,570		197
Equity securities available for sale:
Common stocks	37,571		30,097		—		7,474
Preferred stocks	104,128		—		100,488		3,640
Total equity securities available for sale	141,699		30,097		100,488		11,114
Arbitrage trading account	384,519		244,647		139,742		130
Total	$	13,174,985	$	274,744	$	12,888,800	$	11,441
Liabilities:
Trading account securities sold but not yet purchased	$	35,956	$	35,956	$	—	$	—
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	$	—

Summarize Changes In Level 3 Assets

The following tables summarize changes in Level 3 assets and liabilities for the three months ended March 31, 2016 and for the year ended December 31, 2015:

	Gains (Losses) Included in:
(In thousands)	Beginning Balance		Earnings (Losses)			Other Comprehensive Income (Loss)			Impairments			Purchases		(Sales)			Paydowns / Maturities			Transfers			Ending Balance
																				In / (Out)
Three months ended March 31, 2016
Assets:
Fixed maturities securities available for sale:
Asset-backed securities	$	199	$	1		$	1		$	—		$	—	$	—		$	(4	)	$	—		$	197
Corporate	154		177			—			—			—		(331		)	—			—			—
Total	353		178			1			—			—		(331		)	(4		)	—			197
Equity securities available for sale:
Common stocks	7,829		—			(355		)	—			—		—			—			—			7,474
Preferred stocks	3,624		16			—			—			—		—			—			—			3,640
Total	11,453		16			(355		)	—			—		—			—			—			11,114
Arbitrage trading account	176		(46		)	—			—			—		—			—			—			130
Total	$	11,982	$	148		$	(354	)	$	—		$	—	$	(331	)	$	(4	)	$	—		$	11,441
Year ended December 31, 2015:
Assets:
Fixed maturities 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

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Reinsurance (Tables)

3 Months Ended

Mar. 31, 2016

Reinsurance Disclosures [Abstract]

Reinsurance Financial Information

The following is a summary of reinsurance financial information:

	For the Three Months
	Ended March 31,
(In thousands)	2016			2015
Written premiums:
Direct	$	1,709,129		$	1,647,341
Assumed	246,568			204,464
Ceded	(291,975		)	(276,403		)
Total net premiums written	$	1,663,722		$	1,575,402
Earned premiums:
Direct	$	1,568,067		$	1,524,736
Assumed	218,367			203,342
Ceded	(259,099		)	(256,065		)
Total net premiums earned	$	1,527,335		$	1,472,013
Ceded losses and loss expenses incurred	$	126,929		$	118,391
Ceded commissions earned	$	47,973		$	43,651

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Fair Value of Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2016

Fair Value Disclosures [Abstract]

Carrying Amounts And Estimated Fair Values Of Financial Instruments

The following table presents the carrying amounts and estimated fair values of the Company’s financial instruments:

	March 31, 2016				December 31, 2015
(In thousands)	Carrying Value		Fair Value		Carrying Value		Fair Value
Assets:
Fixed maturity securities	$	12,745,436	$	12,765,246	$	12,444,394	$	12,462,847
Equity securities available for sale	141,699		141,699		150,866		150,866
Arbitrage trading account	384,519		384,519		376,697		376,697
Loans receivable	149,388		151,920		273,103		275,747
Cash and cash equivalents	837,515		837,515		763,631		763,631
Trading account receivables from brokers and clearing organizations	373,833		373,833		383,115		383,115
Due from broker	—		—		1,713		1,713
Liabilities:
Due to broker	71,024		71,024		—		—
Trading account securities sold but not yet purchased	35,956		35,956		37,035		37,035
Subordinated debentures	446,485		462,256		340,320		355,880
Senior notes and other debt	1,814,998		2,018,282		1,844,621		2,029,572

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Restricted Stock Units (Tables)

3 Months Ended

Mar. 31, 2016

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

Summary Of Restricted Stock Units Issued

A summary of RSUs issued in the three months ended March 31, 2016 and 2015 follows:

($ in thousands)	Units	Fair Value
Three months ended March 31,
2016	5,580	$	286
2015	10,000	$	503

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Industry Segments (Tables)

3 Months Ended

Mar. 31, 2016

Segment Reporting [Abstract]

Financial Information Of Company Operating Segments

	Revenues
(In thousands)	Earned Premiums		Investment Income		Other		Total		Pre-Tax Income (Loss)			Net Income (Loss) to Common Stockholders
Three months ended March 31, 2016:
Insurance	$	1,375,358	$	105,229	$	26,793	$	1,507,380	$	205,915		$	139,270
Reinsurance	151,977		18,401		—		170,378		21,797			15,117
Corporate, other and eliminations (1)	—		6,503		115,607		122,110		(60,379		)	(39,649		)
Net investment gains	—		—		7,343		7,343		7,343			4,773
Consolidated	$	1,527,335	$	130,133	$	149,743	$	1,807,211	$	174,676		$	119,511
Three months ended March 31, 2015:
Insurance	$	1,311,276	$	99,084	$	25,575	$	1,435,935	$	188,169		$	130,039
Reinsurance	160,737		17,041		—		177,778		20,262			14,500
Corporate, other and eliminations (1)	—		8,114		103,808		111,922		(58,758		)	(38,611		)
Net investment gains	—		—		19,044		19,044		19,044			12,379
Consolidated	$	1,472,013	$	124,239	$	148,427	$	1,744,679	$	168,717		$	118,307
Twelve months ended December 31, 2015:
Insurance	$	5,431,500	$	410,457	$	96,487	$	5,938,444	$	776,593		$	532,286
Reinsurance	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
Twelve months ended December 31, 2014
Insurance	$	5,074,308	$	484,039	$	106,853	$	5,665,200	$	826,088		$	561,643
Reinsurance	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
Twelve months ended December 31, 2013
Insurance	$	4,505,567	$	451,319	$	107,517	$	5,064,403	$	705,662		$	490,273
Reinsurance	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

________

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

Identifiable Assets By Segment

Identifiable Assets

(In thousands)	March 31, 2016		December 31, 2015		December 31, 2014
Insurance	$	18,232,365	$	18,063,730	$	17,944,847
Reinsurance	2,595,231		2,441,340		2,713,554
Corporate, other and eliminations	1,403,338		1,219,086		1,058,290
Consolidated	$	22,230,934	$	21,724,156	$	21,716,691

Net Premiums Earned By Major Line Of Business

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

	For the Three Months
	Ended March 31,
(In thousands)	2016		2015
Insurance:
Other liability	$	422,956	$	396,904
Workers’ compensation	345,503		314,738
Short-tail lines	331,857		323,090
Commercial automobile	156,817		165,560
Professional liability	118,225		110,984
Total Insurance	1,375,358		1,311,276
Reinsurance:
Casualty	100,334		112,816
Property	51,643		47,921
Total Reinsurance	151,977		160,737
Total	$	1,527,335	$	1,472,013

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General General (Details)	3 Months Ended
	Mar. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Federal Income Tax Rate	35.00%

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Per Share Data (Weighted Average Number of Common Shares Used In the Computation of Basic and Diluted Earnings per Share) (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Earnings Per Share [Abstract]
Basic (shares)	122,780	125,969
Diluted (shares)	128,529	132,484

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Acquistions Acquisitions (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Goodwill	$ 153,747	$ 153,291
Premiums and fees receivable	1,749,273	1,669,186
Noncontrolling interests	$ 36,843	32,962
Selling and Marketing Expense [Member]
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired	85.00%
Cash and cash equivalents	$ 1,072
Real estate, furniture and equipment	701
Goodwill and other intangibles assets	40,282
Premiums and fees receivable	3,845
Other assets	5,166
Total assets acquired	51,066
Other liabilities assumed	(4,931)
Noncontrolling interests	$ (3,850)
Net assets acquired		$ 42,285

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Acquistions Intangibles (Details)	Mar. 31, 2016
Selling and Marketing Expense [Member]
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired	85.00%

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Statements of Comprehensive Income (Loss) Statements of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Beginning of Period		$ (66,698)
Other comprehensive income (loss)		74,808	$ (31,514)
Accumulated Other Comprehensive Income (Loss), End of Period		8,124
Net realized investment gains		25,457	19,044
Income before income taxes		174,676	168,717
Income before taxes		582,459	551,046
Tax effect		54,428	50,273
After-tax amounts reclassified		120,248	118,444
Unrealized investment gains, pre-tax		114,390	24,536
Unrealized investment gains, tax effect		(37,535)	(8,245)
Unrealized investment gains, after-tax amounts		76,855	16,291
Currency translation adjustment, pre-tax		(2,047)	(47,805)
Currency translation adjustment, tax effect		0	0
Change in unrealized currency translation adjustments		(2,047)	(47,805)
Other comprehensive income (loss), pre-tax		112,343	(23,269)
Other comprehensive income (loss), tax effect		(37,535)	(8,245)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Beginning of Period		180,695	306,199
Other comprehensive income (loss) before reclassifications		78,242	24,592
Amounts reclassified from AOCI		(1,387)	(8,301)
Other comprehensive income (loss)		76,855	16,291
Unrealized investment gain related to non-controlling interest		14	22
Accumulated Other Comprehensive Income (Loss), End of Period		257,564	322,512
Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Beginning of Period		(247,393)	(122,649)
Other comprehensive income (loss) before reclassifications		(2,047)	(47,805)
Amounts reclassified from AOCI		0	0
Other comprehensive income (loss)		(2,047)	(47,805)
Unrealized investment gain related to non-controlling interest		0	0
Accumulated Other Comprehensive Income (Loss), End of Period		(249,440)	(170,454)
Change in unrealized currency translation adjustments		(2,047)	(47,805)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Beginning of Period		(66,698)	183,550
Other comprehensive income (loss) before reclassifications		76,195	(23,213)
Amounts reclassified from AOCI		(1,387)	(8,301)
Other comprehensive income (loss)		74,808	(31,514)
Unrealized investment gain related to non-controlling interest		14	22
Accumulated Other Comprehensive Income (Loss), End of Period		8,124	152,058
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Net realized investment gains	[1]	(2,134)	(12,771)
Tax effect	[2]	747	4,470
After-tax amounts reclassified		(1,387)	(8,301)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Income before income taxes		0	0
Tax effect	[2]	0	0
After-tax amounts reclassified		0	0
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Income before income taxes		(2,134)	(12,771)
Tax effect	[2]	(747)	(4,470)
After-tax amounts reclassified		$ (1,387)	$ (8,301)

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

[2] {F|ahBzfndlYmZpbGluZ3MtaHJkcmoLEgZYTUxEb2MiXlhCUkxEb2NHZW5JbmZvOmY3MWVjOGIxMjAxNDRlNDVhYmJlYjA3ZTM2YTAyN2FhfFRleHRTZWxlY3Rpb246MTQ3OTE0NTlGRDhGNTkxNTk3ODYwMzY2Q0VGN0JDRDcM}

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Statements of Cash Flow (Details) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Supplemental Cash Flow Information [Abstract]
Interest payments	$ 56,968,000	$ 56,632,000
Income taxes paid	$ 5,644,000	$ 4,769,000

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Investments In Fixed Maturity Securities Investments in Fixed Maturity Securities (Investments in fixed maturity securities) (Details) - USD ($)		Mar. 31, 2016		Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Total held to maturity, Amortized Cost		$ 96,669,000		$ 96,267,000
Held to Maturity Securities Accumulated Unrecognized Holding Gain		19,810,000		18,453,000
Held to Maturity Securities Accumulated Unrecognized Holding Loss		0		0
Total held to maturity, Fair Value		116,479,000		114,720,000
Total held to maturity, Carrying Value		96,669,000		96,267,000
Total available for sale, Amortized Cost		12,218,217,000		12,012,041,000
Total available for sale, Gross Unrealized Gains		507,661,000		427,492,000
Total available for sale, Gross Unrealized Losses		(77,111,000)		(91,406,000)
Total available for sale, Fair Value		12,648,767,000		12,348,127,000
Total available for sale, Carrying Value		12,648,767,000		12,348,127,000
Total investments in fixed maturity securities, Amortized Value		12,314,886,000		12,108,308,000
Total investments in fixed maturity securities, Gross Unrealized Gains		527,471,000		445,945,000
Total investments in fixed maturity securities, Gross Unrealized Losses		(77,111,000)		(91,406,000)
Total investments in fixed maturity securities, Fair Value		12,765,246,000		12,462,847,000
Total investments in fixed maturity securities, Carrying Value		$ 12,745,436,000		12,444,394,000
Minimum ownership of Common stockholders equity		10.00%
Foreign government
Schedule of Available-for-sale Securities [Line Items]
Total available for sale, Amortized Cost		$ 849,800,000		799,839,000
Total available for sale, Gross Unrealized Gains		54,580,000		50,310,000
Total available for sale, Gross Unrealized Losses		(6,461,000)		(12,689,000)
Total available for sale, Fair Value		897,919,000		837,460,000
Total available for sale, Carrying Value		897,919,000		837,460,000
Commercial Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale, Amortized Cost		65,138,000		64,975,000
Total available for sale, Gross Unrealized Gains		778,000		875,000
Total available for sale, Gross Unrealized Losses		(616,000)		(128,000)
Total available for sale, Fair Value		65,300,000		65,722,000
Total available for sale, Carrying Value		65,300,000		65,722,000
U.S. government and government agency
Schedule of Available-for-sale Securities [Line Items]
Total available for sale, Amortized Cost		571,330,000		645,092,000
Total available for sale, Gross Unrealized Gains		27,602,000		27,660,000
Total available for sale, Gross Unrealized Losses		(981,000)		(2,333,000)
Total available for sale, Fair Value		597,951,000		670,419,000
Total available for sale, Carrying Value		597,951,000		670,419,000
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale, Amortized Cost		2,613,723,000		2,510,816,000
Total available for sale, Gross Unrealized Gains		120,174,000		102,909,000
Total available for sale, Gross Unrealized Losses		(2,047,000)		(3,737,000)
Total available for sale, Fair Value		2,731,850,000		2,609,988,000
Total available for sale, Carrying Value		2,731,850,000		2,609,988,000
Corporation [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale, Amortized Cost		388,408,000		388,904,000
Total available for sale, Gross Unrealized Gains		15,034,000		14,039,000
Total available for sale, Gross Unrealized Losses		(618,000)		(402,000)
Total available for sale, Fair Value		402,824,000		402,541,000
Total available for sale, Carrying Value		402,824,000		402,541,000
Debt, State Government [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale, Amortized Cost		595,465,000		583,456,000
Total available for sale, Gross Unrealized Gains		30,624,000		28,068,000
Total available for sale, Gross Unrealized Losses		(1,817,000)		(2,070,000)
Total available for sale, Fair Value		624,272,000		609,454,000
Total available for sale, Carrying Value		624,272,000		609,454,000
Revenue Subject to Refund [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale, Amortized Cost		407,586,000		439,772,000
Total available for sale, Gross Unrealized Gains		32,630,000		32,056,000
Total available for sale, Gross Unrealized Losses		0		(31,000)
Total available for sale, Fair Value		440,216,000		471,797,000
Total available for sale, Carrying Value		440,216,000		471,797,000
Residential Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale, Amortized Cost	[1]	1,067,877,000		1,126,382,000
Total available for sale, Gross Unrealized Gains	[1]	27,520,000		18,935,000
Total available for sale, Gross Unrealized Losses	[1]	(5,548,000)		(11,180,000)
Total available for sale, Fair Value		1,089,849,000	[1]	1,134,137,000
Total available for sale, Carrying Value	[1]	1,089,849,000		1,134,137,000
Non-credit portion of other-than-temporary impairments (OTTI)		1,324,214		1,269,491
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale, Amortized Cost		3,447,323,000		3,403,953,000
Total available for sale, Gross Unrealized Gains		157,413,000		115,478,000
Total available for sale, Gross Unrealized Losses		(36,160,000)		(44,393,000)
Total available for sale, Fair Value		3,568,576,000		3,475,038,000
Total available for sale, Carrying Value		3,568,576,000		3,475,038,000
State and municipal
Schedule of Available-for-sale Securities [Line Items]
Total available for sale, Amortized Cost		4,361,448,000		4,265,106,000
Total available for sale, Gross Unrealized Gains		227,819,000		201,342,000
Total available for sale, Gross Unrealized Losses		(4,499,000)		(6,269,000)
Total available for sale, Fair Value		4,584,768,000		4,460,179,000
Total available for sale, Carrying Value		4,584,768,000		4,460,179,000
Debt, Local Government [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale, Amortized Cost		356,266,000		342,158,000
Total available for sale, Gross Unrealized Gains		29,357,000		24,270,000
Total available for sale, Gross Unrealized Losses		(17,000)		(29,000)
Total available for sale, Fair Value		385,606,000		366,399,000
Total available for sale, Carrying Value		385,606,000		366,399,000
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Total available for sale, Amortized Cost		1,133,015,000		1,191,357,000
Total available for sale, Gross Unrealized Gains		28,298,000		19,810,000
Total available for sale, Gross Unrealized Losses		(6,164,000)		(11,308,000)
Total available for sale, Fair Value		1,155,149,000		1,199,859,000
Total available for sale, Carrying Value		1,155,149,000		1,199,859,000
Asset-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale, Amortized Cost		1,855,301,000		1,706,694,000
Total available for sale, Gross Unrealized Gains		11,949,000		12,892,000
Total available for sale, Gross Unrealized Losses		(22,846,000)		(14,414,000)
Total available for sale, Fair Value		1,844,404,000		1,705,172,000
Total available for sale, Carrying Value		1,844,404,000		1,705,172,000
Industrial Property [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale, Amortized Cost		2,007,460,000		1,976,393,000
Total available for sale, Gross Unrealized Gains		106,650,000		75,168,000
Total available for sale, Gross Unrealized Losses		(20,538,000)		(30,027,000)
Total available for sale, Fair Value		2,093,572,000		2,021,534,000
Total available for sale, Carrying Value		2,093,572,000		2,021,534,000
Domestic Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale, Amortized Cost		1,176,238,000		1,153,096,000
Total available for sale, Gross Unrealized Gains		39,566,000		31,744,000
Total available for sale, Gross Unrealized Losses		(13,664,000)		(11,819,000)
Total available for sale, Fair Value		1,202,140,000		1,173,021,000
Total available for sale, Carrying Value		1,202,140,000		1,173,021,000
Public Utility, Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale, Amortized Cost		197,336,000		192,857,000
Total available for sale, Gross Unrealized Gains		10,771,000		8,321,000
Total available for sale, Gross Unrealized Losses		(1,958,000)		(2,527,000)
Total available for sale, Fair Value		206,149,000		198,651,000
Total available for sale, Carrying Value		206,149,000		198,651,000
Other Security Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available for sale, Amortized Cost		66,289,000		81,607,000
Total available for sale, Gross Unrealized Gains		426,000		245,000
Total available for sale, Gross Unrealized Losses		0		(20,000)
Total available for sale, Fair Value		66,715,000		81,832,000
Total available for sale, Carrying Value		66,715,000		81,832,000
State and municipal
Schedule of Available-for-sale Securities [Line Items]
Total held to maturity, Amortized Cost		78,264,000		77,129,000
Held to Maturity Securities Accumulated Unrecognized Holding Gain		17,340,000		(16,246,000)
Held to Maturity Securities Accumulated Unrecognized Holding Loss		0		0
Total held to maturity, Fair Value		95,604,000		93,375,000
Total held to maturity, Carrying Value		78,264,000		77,129,000
Residential Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total held to maturity, Amortized Cost		18,405,000		19,138,000
Held to Maturity Securities Accumulated Unrecognized Holding Gain		2,470,000		2,207,000
Held to Maturity Securities Accumulated Unrecognized Holding Loss		0		0
Total held to maturity, Fair Value		20,875,000		21,345,000
Total held to maturity, Carrying Value		$ 18,405,000		$ 19,138,000

[1] Gross unrealized losses for residential mortgage-backed securities include $1,324,214 and $1,269,491 as of March 31, 2016 and December 31, 2015, respectively, related to the non-credit portion of other-than-temporary impairments (“OTTI”) recognized in accumulated other comprehensive income.

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Investments In Fixed Maturity Securities Investments in Fixed Maturity Securities (Amortized cost and fair value of fixed maturity securities) (Details) - USD ($) $ in Thousands		Mar. 31, 2016		Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment		$ 96,669		$ 96,267
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain		(19,810)		(18,453)
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss		0		0
Held-to-maturity Securities, Fair Value		116,479		114,720
Held-to-maturity Securities		96,669		96,267
Available-for-sale Debt Securities, Amortized Cost Basis		12,218,217		12,012,041
Available For Sale Securities Debt Securities Gross Unrealized Gain		507,661		427,492
Available For Sale Securities Debt Securities Gross Unrealized Losses		(77,111)		(91,406)
Available For Sale Securities Debt Securities Fair Value		12,648,767		12,348,127
Available-for-sale Securities, Debt Securities		12,648,767		12,348,127
Marketable Securities Fixed Maturities Gross Unrealized Gains		527,471		445,945
Fixed maturity securities		12,745,436		12,444,394
Marketable Securities Fixed Maturities Gross Unrealized Losses		77,111		91,406
Amortized Cost, Due in one year or less		812,491
Amortized Cost, Due after one year through five years		4,360,294
Amortized Cost, Due after five years through ten years		3,482,275
Amortized Cost, Due after ten years		2,508,406
Amortized Cost, Mortgaged-backed securities		1,151,420
Total investments in fixed maturity securities, Amortized Value		12,314,886		12,108,308
Fair Value, Due in one year or less		822,851
Fair Value, Due after one year through five years		4,522,431
Fair Value, Due after five years through ten years		3,659,124
Fair Value, Due after ten years		2,584,816
Fair Value, Mortgage-backed securities		1,176,024
Total investments in fixed maturity securities, Fair Value		12,765,246		12,462,847
Foreign government
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis		849,800		799,839
Available For Sale Securities Debt Securities Gross Unrealized Gain		54,580		50,310
Available For Sale Securities Debt Securities Gross Unrealized Losses		(6,461)		(12,689)
Available For Sale Securities Debt Securities Fair Value		897,919		837,460
Available-for-sale Securities, Debt Securities		897,919		837,460
Commercial Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis		65,138		64,975
Available For Sale Securities Debt Securities Gross Unrealized Gain		778		875
Available For Sale Securities Debt Securities Gross Unrealized Losses		(616)		(128)
Available For Sale Securities Debt Securities Fair Value		65,300		65,722
Available-for-sale Securities, Debt Securities		65,300		65,722
Residential Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	[1]	1,067,877		1,126,382
Available For Sale Securities Debt Securities Gross Unrealized Gain	[1]	27,520		18,935
Available For Sale Securities Debt Securities Gross Unrealized Losses	[1]	(5,548)		(11,180)
Available For Sale Securities Debt Securities Fair Value		1,089,849	[1]	1,134,137
Available-for-sale Securities, Debt Securities	[1]	1,089,849		1,134,137
State and municipal
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis		4,361,448		4,265,106
Available For Sale Securities Debt Securities Gross Unrealized Gain		227,819		201,342
Available For Sale Securities Debt Securities Gross Unrealized Losses		(4,499)		(6,269)
Available For Sale Securities Debt Securities Fair Value		4,584,768		4,460,179
Available-for-sale Securities, Debt Securities		4,584,768		4,460,179
U.S. government and government agency
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis		571,330		645,092
Available For Sale Securities Debt Securities Gross Unrealized Gain		27,602		27,660
Available For Sale Securities Debt Securities Gross Unrealized Losses		(981)		(2,333)
Available For Sale Securities Debt Securities Fair Value		597,951		670,419
Available-for-sale Securities, Debt Securities		597,951		670,419
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis		2,613,723		2,510,816
Available For Sale Securities Debt Securities Gross Unrealized Gain		120,174		102,909
Available For Sale Securities Debt Securities Gross Unrealized Losses		(2,047)		(3,737)
Available For Sale Securities Debt Securities Fair Value		2,731,850		2,609,988
Available-for-sale Securities, Debt Securities		2,731,850		2,609,988
Debt, State Government [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis		595,465		583,456
Available For Sale Securities Debt Securities Gross Unrealized Gain		30,624		28,068
Available For Sale Securities Debt Securities Gross Unrealized Losses		(1,817)		(2,070)
Available For Sale Securities Debt Securities Fair Value		624,272		609,454
Available-for-sale Securities, Debt Securities		624,272		609,454
Revenue Subject to Refund [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis		407,586		439,772
Available For Sale Securities Debt Securities Gross Unrealized Gain		32,630		32,056
Available For Sale Securities Debt Securities Gross Unrealized Losses		0		(31)
Available For Sale Securities Debt Securities Fair Value		440,216		471,797
Available-for-sale Securities, Debt Securities		440,216		471,797
Corporation [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis		388,408		388,904
Available For Sale Securities Debt Securities Gross Unrealized Gain		15,034		14,039
Available For Sale Securities Debt Securities Gross Unrealized Losses		(618)		(402)
Available For Sale Securities Debt Securities Fair Value		402,824		402,541
Available-for-sale Securities, Debt Securities		402,824		402,541
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis		3,447,323		3,403,953
Available For Sale Securities Debt Securities Gross Unrealized Gain		157,413		115,478
Available For Sale Securities Debt Securities Gross Unrealized Losses		(36,160)		(44,393)
Available For Sale Securities Debt Securities Fair Value		3,568,576		3,475,038
Available-for-sale Securities, Debt Securities		3,568,576		3,475,038
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis		1,133,015		1,191,357
Available For Sale Securities Debt Securities Gross Unrealized Gain		28,298		19,810
Available For Sale Securities Debt Securities Gross Unrealized Losses		(6,164)		(11,308)
Available For Sale Securities Debt Securities Fair Value		1,155,149		1,199,859
Available-for-sale Securities, Debt Securities		1,155,149		1,199,859
Asset-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis		1,855,301		1,706,694
Available For Sale Securities Debt Securities Gross Unrealized Gain		11,949		12,892
Available For Sale Securities Debt Securities Gross Unrealized Losses		(22,846)		(14,414)
Available For Sale Securities Debt Securities Fair Value		1,844,404		1,705,172
Available-for-sale Securities, Debt Securities		1,844,404		1,705,172
Industrial Property [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis		2,007,460		1,976,393
Available For Sale Securities Debt Securities Gross Unrealized Gain		106,650		75,168
Available For Sale Securities Debt Securities Gross Unrealized Losses		(20,538)		(30,027)
Available For Sale Securities Debt Securities Fair Value		2,093,572		2,021,534
Available-for-sale Securities, Debt Securities		2,093,572		2,021,534
Domestic Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis		1,176,238		1,153,096
Available For Sale Securities Debt Securities Gross Unrealized Gain		39,566		31,744
Available For Sale Securities Debt Securities Gross Unrealized Losses		(13,664)		(11,819)
Available For Sale Securities Debt Securities Fair Value		1,202,140		1,173,021
Available-for-sale Securities, Debt Securities		1,202,140		1,173,021
Public Utility, Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis		197,336		192,857
Available For Sale Securities Debt Securities Gross Unrealized Gain		10,771		8,321
Available For Sale Securities Debt Securities Gross Unrealized Losses		(1,958)		(2,527)
Available For Sale Securities Debt Securities Fair Value		206,149		198,651
Available-for-sale Securities, Debt Securities		206,149		198,651
Other Security Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis		66,289		81,607
Available For Sale Securities Debt Securities Gross Unrealized Gain		426		245
Available For Sale Securities Debt Securities Gross Unrealized Losses		0		(20)
Available For Sale Securities Debt Securities Fair Value		66,715		81,832
Available-for-sale Securities, Debt Securities		66,715		81,832
State and municipal
Schedule of Available-for-sale Securities [Line Items]
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment		78,264		77,129
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain		(17,340)		16,246
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss		0		0
Held-to-maturity Securities, Fair Value		95,604		93,375
Held-to-maturity Securities		78,264		77,129
Residential Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment		18,405		19,138
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain		(2,470)		(2,207)
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss		0		0
Held-to-maturity Securities, Fair Value		20,875		21,345
Held-to-maturity Securities		$ 18,405		$ 19,138

[1] Gross unrealized losses for residential mortgage-backed securities include $1,324,214 and $1,269,491 as of March 31, 2016 and December 31, 2015, respectively, related to the non-credit portion of other-than-temporary impairments (“OTTI”) recognized in accumulated other comprehensive income.

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Investments in Equity Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Cost	$ 145,676	$ 165,192
Gross Unrealized, Gains	8,006	8,216
Gross Unrealized, Losses	(11,983)	(22,542)
Carrying and fair value of equity securities	141,699	150,866
Common stocks
Schedule of Available-for-sale Securities [Line Items]
Cost	38,686	56,462
Gross Unrealized, Gains	424	0
Gross Unrealized, Losses	(1,539)	(19,189)
Carrying and fair value of equity securities	37,571	37,273
Preferred stocks
Schedule of Available-for-sale Securities [Line Items]
Cost	106,990	108,730
Gross Unrealized, Gains	7,582	8,216
Gross Unrealized, Losses	(10,444)	(3,353)
Carrying and fair value of equity securities	$ 104,128	$ 113,593

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Arbitrage Trading Account (Details) - Options Held [Member] $ in Millions	Mar. 31, 2016 USD ($)
Short [Member]
Derivative [Line Items]
Derivative, Fair Value, Net	$ 0.4
Derivative, Notional Amount	12.7
Long [Member]
Derivative [Line Items]
Derivative, Fair Value, Net	0.5
Derivative, Notional Amount	$ 6.7

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Net Investment Income Net Investment Income (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net Investment Income [Line Items]
Investment income	$ 132,246	$ 127,116
Investment expense	(2,113)	(2,877)
Net investment income	130,133	124,239	$ 512,645	$ 600,885	$ 544,291
Fixed maturity securities, including cash and cash equivalents and loans receivable
Net Investment Income [Line Items]
Investment income	108,835	108,129
Investment funds
Net Investment Income [Line Items]
Investment income	16,636	6,061
Arbitrage trading account
Net Investment Income [Line Items]
Investment income	3,190	8,979
Equity securities available for sale
Net Investment Income [Line Items]
Investment income	868	1,180
Real estate
Net Investment Income [Line Items]
Investment income	$ 2,717	$ 2,767

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Investment Funds Investment Funds (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	21.00%
Investment funds	$ 1,179,310		$ 1,170,040
Income (Loss) from Investment Funds	16,636	$ 6,061
Alternative Investments, Fair Value Disclosure	295,300
Real estate
Schedule of Equity Method Investments [Line Items]
Investment funds	597,380		580,830
Income (Loss) from Investment Funds	17,037	26,012
Energy
Schedule of Equity Method Investments [Line Items]
Investment funds	95,849		93,719
Income (Loss) from Investment Funds	(3,924)	(21,868)
Hedge equity
Schedule of Equity Method Investments [Line Items]
Investment funds	67,728		70,580
Income (Loss) from Investment Funds	(2,852)	(873)
Other funds
Schedule of Equity Method Investments [Line Items]
Investment funds	418,353		$ 424,911
Income (Loss) from Investment Funds	6,375	$ 2,790
Equity Method Investee [Member]
Schedule of Equity Method Investments [Line Items]
Investment funds	$ 46,300

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Real Estate Real Estate (Details) - USD ($)	Mar. 31, 2016	Dec. 31, 2015
Real Estate [Abstract]
Properties in operation	$ 239,476,000	$ 226,055,000
Properties under development	747,334,000	710,312,000
Total	986,810,000	936,367,000
Real Estate Investment Property, Accumulated Depreciation	$ 10,896,000	$ 9,073,000

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Real Estate Real Estate (Details 1) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Real Estate [Abstract]
Accumulated depreciation and amortization on properties	$ 10,896,000		$ 9,073,000
Real estate depreciation expense	1,668,000	$ 2,543,000
Operating Leases, Future Minimum Payments Receivable, Remainder of Fiscal Year	9,614,350
Lease future minimum payments Current	15,791,035
Operating Leases, Future Minimum Payments Receivable, in Two Years	14,793,678
Lease future minimum payments 2017	11,822,103
Future Minimum Payments 2018	9,830,091
Lease future minimum payments 2019	9,591,819
Lease future minimum payments there after	$ 343,543,992

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Loans Receivable (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	$ 6,700		$ 3,100
Loans and Leases Receivable, Gross	149,388		273,103
Loans receivable	151,920		275,747
Valuation allowance, specific	555		0
Valuation allowance, general	2,107		2,094
Valuation allowance of loans receivable	2,662		2,094
Decrease in valuation allowance	568	$ (47)
Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	121,861		200,499
Loans receivable	124,393		201,641
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross	27,527		72,604
Loans receivable	$ 27,527		$ 74,106

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Realized And Unrealized Investment Gains Realized and Unrealized Investment Gains (Loss) (Realized and unrealized investmetns gains(losses)) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]
Fixed maturity securities, gains	$ 23,064	$ 4,146
Fixed maturity securities, losses	(2,940)	(1,077)
Equity securities available for sale	125	9,702
Investment funds	(460)	(1,511)
Real Estate Realized Gain (Loss) on Disposal	5,024	0
Other	644	7,784
Realized Gain (Loss) on Investments, Including Equity Method Investments, Excluding Other than Temporary Impairments and Allowances	25,457	19,044
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net	(18,114)	0
Gain (Loss) on Investments	7,343	19,044
Net investment gains	7,343	19,044	$ 92,324	$ 254,852	$ 121,544
Income tax expense	(2,570)	(6,665)
After-tax net realized investment gains	$ 4,773	$ 12,379

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Realized and Unrealized Investment Gains (Losses) (Change in Unrealized Gains (Losses) of Available For Sales Securities) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Realized and Unrealized Investment Gains Losses [Line Items]
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net	$ 18,114	$ 0
Change in unrealized gains (losses) before income taxes and noncontrolling interests	114,390	24,536
Income tax benefit (expense)	(37,535)	(8,245)
Noncontrolling interests	14	22
Total change in unrealized gains	76,869	16,313
Debt Securities [Member]
Realized and Unrealized Investment Gains Losses [Line Items]
Change in unrealized gains (losses) before income taxes and noncontrolling interests	92,428	42,480
Debt Securities Previously Impaired [Member]
Realized and Unrealized Investment Gains Losses [Line Items]
Change in unrealized gains (losses) before income taxes and noncontrolling interests	(55)	8
Equity securities available for sale
Realized and Unrealized Investment Gains Losses [Line Items]
Change in unrealized gains (losses) before income taxes and noncontrolling interests	13,137	(6,845)
Investment funds
Realized and Unrealized Investment Gains Losses [Line Items]
Change in unrealized gains (losses) before income taxes and noncontrolling interests	$ 8,880	$ (11,107)

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Securities In An Unrealized Loss Position Securities in an Unrealized Loss Position (Securities in an Unrealized Loss Position) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	$ 2,016,320	$ 3,497,447
Gross Unrealized Losses, Less than 12 Months	53,400	78,466
Fair Value, 12 Months or Greater	741,468	672,929
Gross Unrealized Losses, 12 Months or Greater	35,694	35,482
Fair Value, Total	2,757,788	4,170,376
Gross Unrealized Losses, Total	89,094	113,948
U.S. government and government agency
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	24,911	101,660
Gross Unrealized Losses, Less than 12 Months	79	487
Fair Value, 12 Months or Greater	43,226	64,500
Gross Unrealized Losses, 12 Months or Greater	902	1,846
Fair Value, Total	68,137	166,160
Gross Unrealized Losses, Total	981	2,333
State and municipal
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	210,419	501,952
Gross Unrealized Losses, Less than 12 Months	1,903	4,404
Fair Value, 12 Months or Greater	171,433	106,681
Gross Unrealized Losses, 12 Months or Greater	2,596	1,865
Fair Value, Total	381,852	608,633
Gross Unrealized Losses, Total	4,499	6,269
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	135,022	381,986
Gross Unrealized Losses, Less than 12 Months	1,748	3,639
Fair Value, 12 Months or Greater	155,445	184,807
Gross Unrealized Losses, 12 Months or Greater	4,416	7,669
Fair Value, Total	290,467	566,793
Gross Unrealized Losses, Total	6,164	11,308
Asset-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	1,207,153	1,091,078
Gross Unrealized Losses, Less than 12 Months	14,032	7,703
Fair Value, 12 Months or Greater	230,979	190,467
Gross Unrealized Losses, 12 Months or Greater	8,814	6,711
Fair Value, Total	1,438,132	1,281,545
Gross Unrealized Losses, Total	22,846	14,414
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	362,296	1,232,940
Gross Unrealized Losses, Less than 12 Months	25,162	35,406
Fair Value, 12 Months or Greater	79,582	76,797
Gross Unrealized Losses, 12 Months or Greater	10,998	8,987
Fair Value, Total	441,878	1,309,737
Gross Unrealized Losses, Total	36,160	44,393
Foreign government
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	41,278	169,190
Gross Unrealized Losses, Less than 12 Months	3,964	8,822
Fair Value, 12 Months or Greater	25,672	19,528
Gross Unrealized Losses, 12 Months or Greater	2,497	3,867
Fair Value, Total	66,950	188,718
Gross Unrealized Losses, Total	6,461	12,689
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	1,981,079	3,478,806
Gross Unrealized Losses, Less than 12 Months	46,888	60,461
Fair Value, 12 Months or Greater	706,337	642,780
Gross Unrealized Losses, 12 Months or Greater	30,223	30,945
Fair Value, Total	2,687,416	4,121,586
Gross Unrealized Losses, Total	77,111	91,406
Preferred stocks
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	35,241	0
Gross Unrealized Losses, Less than 12 Months	6,512	0
Fair Value, 12 Months or Greater	27,657	22,320
Gross Unrealized Losses, 12 Months or Greater	3,932	3,353
Fair Value, Total	62,898	22,320
Gross Unrealized Losses, Total	10,444	3,353
Equity securities available for sale
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	35,241	18,641
Gross Unrealized Losses, Less than 12 Months	6,512	18,005
Fair Value, 12 Months or Greater	35,131	30,149
Gross Unrealized Losses, 12 Months or Greater	5,471	4,537
Fair Value, Total	70,372	48,790
Gross Unrealized Losses, Total	11,983	22,542
Common stocks
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	0	18,641
Gross Unrealized Losses, Less than 12 Months	0	18,005
Fair Value, 12 Months or Greater	7,474	7,829
Gross Unrealized Losses, 12 Months or Greater	1,539	1,184
Fair Value, Total	7,474	26,470
Gross Unrealized Losses, Total	1,539	$ 19,189
Noninvestment Grade Investments at Loss Less than 5 Million [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Total	176,942
Noninvestment Grade Investments at Loss Less than 5 Million [Member] | Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Total	35,540
Noninvestment Grade Investments at Loss Less than 5 Million [Member] | Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Total	$ 92,666

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Securities In An Unrealized Loss Position Non-Investment Grade Fixed Maturity Securities (Details)	3 Months Ended
	Mar. 31, 2016 USD ($) position	Dec. 31, 2015 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Aggregate fair value of securities in a continuous unrealized loss position	$ 2,757,788,000	$ 4,170,376,000
Available For Sale Equity Securities Gross Unrealized Gains	8,006,000	8,216,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses Accumulated In AOCI	89,094,000	113,948,000
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Aggregate fair value of securities in a continuous unrealized loss position	2,687,416,000	4,121,586,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses Accumulated In AOCI	77,111,000	91,406,000
Preferred stocks
Schedule of Available-for-sale Securities [Line Items]
Aggregate fair value of securities in a continuous unrealized loss position	62,898,000	22,320,000
Available For Sale Equity Securities Gross Unrealized Gains	7,582,000	8,216,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses Accumulated In AOCI	10,444,000	3,353,000
Common stocks
Schedule of Available-for-sale Securities [Line Items]
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities	7,500,000
Aggregate fair value of securities in a continuous unrealized loss position	7,474,000	26,470,000
Available For Sale Equity Securities Gross Unrealized Gains	424,000	0
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses Accumulated In AOCI	1,539,000	19,189,000
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Aggregate fair value of securities in a continuous unrealized loss position	290,467,000	566,793,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses Accumulated In AOCI	6,164,000	11,308,000
Asset-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Aggregate fair value of securities in a continuous unrealized loss position	1,438,132,000	1,281,545,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses Accumulated In AOCI	22,846,000	14,414,000
State and municipal
Schedule of Available-for-sale Securities [Line Items]
Aggregate fair value of securities in a continuous unrealized loss position	381,852,000	608,633,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses Accumulated In AOCI	4,499,000	6,269,000
Foreign government
Schedule of Available-for-sale Securities [Line Items]
Aggregate fair value of securities in a continuous unrealized loss position	66,950,000	188,718,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses Accumulated In AOCI	6,461,000	12,689,000
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Aggregate fair value of securities in a continuous unrealized loss position	441,878,000	1,309,737,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses Accumulated In AOCI	$ 36,160,000	$ 44,393,000
Noninvestment Grade Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities	5
Noninvestment Grade Investments at Loss Less than 5 Million [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities	39
Aggregate fair value of securities in a continuous unrealized loss position	$ 176,942,000
Gross Unrealized Loss	$ 15,918,000
Noninvestment Grade Investments at Loss Less than 5 Million [Member] | Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Number of Securities	12
Aggregate fair value of securities in a continuous unrealized loss position	$ 35,540,000
Gross Unrealized Loss	$ 1,866,000
Noninvestment Grade Investments at Loss Less than 5 Million [Member] | Foreign Government Debt [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities	5
Aggregate fair value of securities in a continuous unrealized loss position	$ 22,414,000
Gross Unrealized Loss	$ 3,011,000
Noninvestment Grade Investments at Loss Less than 5 Million [Member] | Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities	15
Aggregate fair value of securities in a continuous unrealized loss position	$ 92,666,000
Gross Unrealized Loss	10,780,000
Common stocks
Schedule of Available-for-sale Securities [Line Items]
Available For Sale Equity Securities Gross Unrealized Gains	$ 1,500,000
Noninvestment Grade Investments at Loss Less than 5 Million [Member] | Asset-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities | position	7
Aggregate fair value of securities in a continuous unrealized loss position	$ 26,322,000
Gross Unrealized Loss	$ 261,000

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Securities In An Unrealized Loss Position Securities In An Unrealized Loss Position (Narrative) (Details) - USD ($)	Mar. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Aggregate fair value of securities in a continuous unrealized loss position	$ 2,757,788,000	$ 4,170,376,000
Gross Unrealized Losses	89,094,000	113,948,000
Available For Sale Equity Securities Gross Unrealized Gains	8,006,000	8,216,000
Loans and Leases Receivable, Other, Allowance	$ 3,000,000	2,000,000
Noninvestment Grade Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities	5
Preferred stocks
Schedule of Available-for-sale Securities [Line Items]
Aggregate fair value of securities in a continuous unrealized loss position	$ 62,898,000	22,320,000
Gross Unrealized Losses	10,444,000	3,353,000
Available For Sale Equity Securities Gross Unrealized Gains	7,582,000	8,216,000
Common stocks
Schedule of Available-for-sale Securities [Line Items]
Aggregate fair value of securities in a continuous unrealized loss position	7,474,000	26,470,000
Gross Unrealized Losses	1,539,000	19,189,000
Available For Sale Equity Securities Gross Unrealized Gains	424,000	$ 0
Common stocks
Schedule of Available-for-sale Securities [Line Items]
Available For Sale Equity Securities Gross Unrealized Gains	$ 1,500,000

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Fair Value Measurements (Assets and Liabilities Measured At Fair Value, On a Recurring Basis) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities	$ 12,648,767	$ 12,348,127
Loans receivable	141,699	150,866
Arbitrage trading account	384,519	376,697
Fair Value, Measurements, Recurring [Member]
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities	12,648,767	12,348,127
Loans receivable	141,699	150,866
Assets, fair value disclosure	13,174,985	12,875,690
Arbitrage trading account	384,519	376,697
Securities sold but not yet purchased	35,956	37,035
Fair Value, Measurements, Recurring [Member] | U.S. government and government agency
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities	597,951	670,419
Fair Value, Measurements, Recurring [Member] | State and municipal
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities	4,584,768	4,460,179
Fair Value, Measurements, Recurring [Member] | Mortgage-backed securities
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities	1,155,149	1,199,859
Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member]
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities	1,844,404	1,705,172
Fair Value, Measurements, Recurring [Member] | Corporate
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities	3,568,576	3,475,038
Fair Value, Measurements, Recurring [Member] | Foreign government
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities	897,919	837,460
Fair Value, Measurements, Recurring [Member] | Common stocks
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Loans receivable	37,571	37,273
Fair Value, Measurements, Recurring [Member] | Preferred stocks
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Loans receivable	104,128	113,593
Level 1 | Fair Value, Measurements, Recurring [Member]
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities	0	0
Loans receivable	30,097	29,444
Assets, fair value disclosure	274,744	286,358
Arbitrage trading account	244,647	256,914
Securities sold but not yet purchased	35,956	35,559
Level 1 | Fair Value, Measurements, Recurring [Member] | U.S. government and government agency
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities	0	0
Level 1 | Fair Value, Measurements, Recurring [Member] | State and municipal
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities	0	0
Level 1 | Fair Value, Measurements, Recurring [Member] | Mortgage-backed securities
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities	0	0
Level 1 | Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member]
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities	0	0
Level 1 | Fair Value, Measurements, Recurring [Member] | Corporate
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities	0	0
Level 1 | Fair Value, Measurements, Recurring [Member] | Foreign government
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities	0	0
Level 1 | Fair Value, Measurements, Recurring [Member] | Common stocks
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Loans receivable	30,097	29,444
Level 1 | Fair Value, Measurements, Recurring [Member] | Preferred stocks
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Loans receivable	0	0
Level 2 | Fair Value, Measurements, Recurring [Member]
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities	12,648,570	12,347,774
Loans receivable	100,488	109,969
Assets, fair value disclosure	12,888,800	12,577,350
Arbitrage trading account	139,742	119,607
Securities sold but not yet purchased	0	1,476
Level 2 | Fair Value, Measurements, Recurring [Member] | U.S. government and government agency
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities	597,951	670,419
Level 2 | Fair Value, Measurements, Recurring [Member] | State and municipal
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities	4,584,768	4,460,179
Level 2 | Fair Value, Measurements, Recurring [Member] | Mortgage-backed securities
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities	1,155,149	1,199,859
Level 2 | Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member]
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities	1,844,207	1,704,973
Level 2 | Fair Value, Measurements, Recurring [Member] | Corporate
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities	3,568,576	3,474,884
Level 2 | Fair Value, Measurements, Recurring [Member] | Foreign government
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities	897,919	837,460
Level 2 | Fair Value, Measurements, Recurring [Member] | Common stocks
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Loans receivable	0	0
Level 2 | Fair Value, Measurements, Recurring [Member] | Preferred stocks
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Loans receivable	100,488	109,969
Level 3 | Fair Value, Measurements, Recurring [Member]
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities	197	353
Loans receivable	11,114	11,453
Assets, fair value disclosure	11,441	11,982
Arbitrage trading account	130	176
Securities sold but not yet purchased	0	0
Level 3 | Fair Value, Measurements, Recurring [Member] | U.S. government and government agency
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities	0	0
Level 3 | Fair Value, Measurements, Recurring [Member] | State and municipal
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities	0	0
Level 3 | Fair Value, Measurements, Recurring [Member] | Mortgage-backed securities
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities	0	0
Level 3 | Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member]
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities	197	199
Level 3 | Fair Value, Measurements, Recurring [Member] | Corporate
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities	0	154
Level 3 | Fair Value, Measurements, Recurring [Member] | Foreign government
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities	0	0
Level 3 | Fair Value, Measurements, Recurring [Member] | Common stocks
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Loans receivable	7,474	7,829
Level 3 | Fair Value, Measurements, Recurring [Member] | Preferred stocks
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Loans receivable	$ 3,640	$ 3,624

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Fair Value Measurements Fair Value Measurements (Summarize Changes in Level 3 Assets) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings, Description	0	-2331
Level 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, beginning balance	$ 11,982	$ 35,939
Assets, earnings	148	(869)
Assets, other comprehensive income	(354)	(82)
Assets, purchases	0	72,640
Assets, (sales)	(331)	(72,229)
Assets, maturities	4	1,820
Assets, ending balance	11,441	11,982
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3		19,266
Level 3 | Asset-backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, beginning balance	199	20,611
Assets, earnings	1	19
Assets, other comprehensive income	1	191
Assets, purchases	0	0
Assets, (sales)	0	0
Assets, maturities	(4)	(1,820)
Assets, ending balance	197	199
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	0	18,802
Impairment of Intangible Assets (Excluding Goodwill)	0	0
Level 3 | Equity securities available for sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, beginning balance	11,453	14,454
Assets, earnings	16	(89)
Assets, other comprehensive income	(355)	(273)
Assets, purchases	0	0
Assets, (sales)	0	(308)
Assets, ending balance	11,114	11,453
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	0	0
Level 3 | Preferred stocks
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, beginning balance	3,624	3,713
Assets, earnings	16	(89)
Assets, other comprehensive income	$ 0	$ 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings, Description	0	0
Assets, purchases	$ 0	$ 0
Assets, (sales)	0	0
Assets, ending balance	3,640	3,624
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	0	0
Level 3 | Common stocks
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, beginning balance	7,829	10,741
Assets, earnings	0	0
Assets, other comprehensive income	$ (355)	$ (273)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings, Description	0	-2331
Assets, purchases	$ 0	$ 0
Assets, (sales)	0	(308)
Assets, ending balance	7,474	7,829
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	0	0
Level 3 | Debt Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, beginning balance	353	20,765
Assets, earnings	178	19
Assets, other comprehensive income	$ 1	$ 191
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings, Description	0	0
Assets, purchases	$ 0	$ 0
Assets, (sales)	(331)	0
Assets, maturities	4	1,820
Assets, ending balance	197	353
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	0	18,802
Level 3 | Corporate Debt Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, beginning balance	154	154
Assets, earnings	177	0
Assets, other comprehensive income	$ 0	$ 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings, Description	0	0
Assets, purchases	$ 0	$ 0
Assets, (sales)	(331)	0
Assets, ending balance	0	154
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	0	0
Level 3 | Trading Assets, Excluding Debt and Equity Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, beginning balance	176	720
Assets, earnings	(46)	(799)
Assets, other comprehensive income	$ 0	$ 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings, Description	0	0
Assets, purchases	$ 0	$ 72,640
Assets, (sales)	0	(71,921)
Assets, ending balance	130	176
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	$ 0	$ 464

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Reinsurance Reinsurance (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Premiums Written
Written premiums, direct	$ 1,709,129	$ 1,647,341
Written premiums, assumed	246,568	204,464
Written premiums, ceded	(291,975)	(276,403)
Total net premiums written	1,663,722	1,575,402
Premiums Earned
Earned premiums, direct	1,568,067	1,524,736
Earned premiums, assumed	218,367	203,342
Earned premiums, ceded	(259,099)	(256,065)
Net premiums earned	1,527,335	1,472,013	$ 6,040,609	$ 5,744,418	$ 5,226,537
Ceded losses and loss expenses incurred	126,929	118,391
Uncollectible reinsurance	1,000		$ 1,000
Fees and Commissions, Other	$ 47,973	$ 43,651

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Fair Value of Financial Instruments (Carrying Amounts and Estimated Fair Values of Financial Instruments) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Assets:
Equity securities	$ 384,519	$ 376,697
Loans receivable	151,920	275,747
Fair Value
Assets:
Fixed maturity securities	12,765,246	12,462,847
Equity securities available for sale	141,699	150,866
Equity securities	384,519	376,697
Loans receivable	151,920	275,747
Cash and cash equivalents	837,515	763,631
Trading account receivables from brokers and clearing organizations	373,833	383,115
Due From Brokers, Fair Value Disclosure	0	1,713
Liabilities:
Trading account securities sold but not yet purchased	35,956	37,035
Subordinated debentures	462,256	355,880
Senior notes and other debt	2,018,282	2,029,572
Carrying Value
Assets:
Fixed maturity securities	12,745,436	12,444,394
Equity securities available for sale	141,699	150,866
Equity securities	384,519	376,697
Loans receivable	149,388	273,103
Cash and cash equivalents	837,515	763,631
Trading account receivables from brokers and clearing organizations	373,833	383,115
Due From Brokers, Fair Value Disclosure	0	1,713
Due from broker fair value	71,024	0
Liabilities:
Trading account securities sold but not yet purchased	35,956	37,035
Subordinated debentures	446,485	340,320
Senior notes and other debt	$ 1,814,998	$ 1,844,621

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Restricted Stock Units (Summary of Restricted Stock Units Issued) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Share-Based Compensation Arrangement by Share-based Payment Award [Line Item]
Share based compensation expense	$ 9,000	$ 8,000
Restricted Stock [Member]
Share-Based Compensation Arrangement by Share-based Payment Award [Line Item]
Restricted Stock Units	5,580	10,000
Restricted Stock Units, Fair Value	$ 286	$ 503
Minimum [Member] | Restricted Stock [Member]
Share-Based Compensation Arrangement by Share-based Payment Award [Line Item]
Award vesting period	3 years
Maximum [Member] | Restricted Stock [Member]
Share-Based Compensation Arrangement by Share-based Payment Award [Line Item]
Award vesting period	5 years

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Industry Segments (Financial Information of Company Operating Segments) (Details) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
		Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Earned Premiums		$ 1,527,335	$ 1,472,013	$ 6,040,609	$ 5,744,418	$ 5,226,537
Investment Income and Funds		130,133	124,239	512,645	600,885	544,291
Other Revenues		149,743	148,427	653,203	783,625	637,706
Total revenues		1,807,211	1,744,679	7,206,457	7,128,928	6,408,534
Pre-Tax Income (Loss)		174,676	168,717	732,030	952,196	698,888
Net Income (Loss)		119,511	118,307	503,694	648,884	499,925
Net investment gains		7,343	19,044	92,324	254,852	121,544
Net investment gains, net of tax		4,773	12,379	60,011	165,654	74,118
Intersegment Eliminations and Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Earned Premiums	[1]	0	0	0	0	0
Investment Income and Funds	[1]	6,503	8,114	27,962	28,025	3,882
Other Revenues	[1]	115,607	103,808	464,392	421,920	408,645
Total revenues	[1]	122,110	111,922	492,354	449,945	412,527
Pre-Tax Income (Loss)	[1]	(60,379)	(58,758)	(231,739)	(244,421)	(238,743)
Net Income (Loss)	[1]	(39,649)	(38,611)	(155,230)	(158,133)	(142,479)
Insurance-Domestic Segment [Member]
Segment Reporting Information [Line Items]
Earned Premiums		1,375,358	1,311,276
Insurance-Domestic Segment [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Earned Premiums		1,375,358	1,311,276	5,431,500	5,074,308	4,505,567
Investment Income and Funds		105,229	99,084	410,457	484,039	451,319
Other Revenues		26,793	25,575	96,487	106,853	107,517
Total revenues		1,507,380	1,435,935	5,938,444	5,665,200	5,064,403
Pre-Tax Income (Loss)		205,915	188,169	776,593	826,088	705,662
Net Income (Loss)		139,270	130,039	532,286	561,643	490,273
Reinsurance-Global Segment [Member]
Segment Reporting Information [Line Items]
Earned Premiums		151,977	160,737
Reinsurance-Global Segment [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Earned Premiums		151,977	160,737	609,109	670,110	720,970
Investment Income and Funds		18,401	17,041	74,226	88,821	89,090
Other Revenues		0	0	0	0	0
Total revenues		170,378	177,778	683,335	758,931	810,060
Pre-Tax Income (Loss)		21,797	20,262	94,852	115,677	110,425
Net Income (Loss)		15,117	14,500	66,627	79,720	78,013
Net Investment Gains Segment [Member]
Segment Reporting Information [Line Items]
Earned Premiums		0	0	0	0	0
Investment Income and Funds		$ 0	$ 0	$ 0	$ 0	$ 0

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

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Industry Segments (Identifiable Assets by Segment) (Details) - USD ($) $ in Thousands		Mar. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting, Asset Reconciling Item [Line Items]
Consolidated Assets		$ 22,230,934	$ 21,724,156	$ 21,716,691
Operating Segments [Member] | Reinsurance-Global Segment [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Consolidated Assets		2,595,231	2,441,340	2,713,554
Operating Segments [Member] | Insurance-Domestic Segment [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Consolidated Assets		18,232,365	18,063,730	17,944,847
Intersegment Eliminations and Corporate, Non-Segment [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Consolidated Assets	[1]	$ 1,403,338	$ 1,219,086	$ 1,058,290

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

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Industry Segments Industry Segments (Net Premiums Earned By Major Line of Business) (Details) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
		Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenue from External Customer [Line Items]
Premiums Earned, Net		$ 1,527,335	$ 1,472,013	$ 6,040,609	$ 5,744,418	$ 5,226,537
Insurance-Domestic Segment [Member]
Revenue from External Customer [Line Items]
Premiums Earned, Net		1,375,358	1,311,276
Insurance-Domestic Segment [Member] | Other Insurance Liabilities [Member]
Revenue from External Customer [Line Items]
Premiums Earned, Net		422,956	396,904
Insurance-Domestic Segment [Member] | Workers' Compensation [Member]
Revenue from External Customer [Line Items]
Premiums Earned, Net		345,503	314,738
Insurance-Domestic Segment [Member] | Property [Member]
Revenue from External Customer [Line Items]
Premiums Earned, Net	[1]	331,857	323,090
Insurance-Domestic Segment [Member] | Commercial Automobile [Member]
Revenue from External Customer [Line Items]
Premiums Earned, Net		156,817	165,560
Insurance-Domestic Segment [Member] | Products Liability [Member]
Revenue from External Customer [Line Items]
Premiums Earned, Net		118,225	110,984
Reinsurance-Global Segment [Member]
Revenue from External Customer [Line Items]
Premiums Earned, Net		151,977	160,737
Reinsurance-Global Segment [Member] | Property [Member]
Revenue from External Customer [Line Items]
Premiums Earned, Net		51,643	47,921
Reinsurance-Global Segment [Member] | Casualty [Member]
Revenue from External Customer [Line Items]
Premiums Earned, Net		$ 100,334	$ 112,816

[1] For the Three Months Ended March 31,(In thousands)2016 2015 Insurance: Other liability$422,956 $396,904Workers’ compensation345,503 314,738Short-tail lines 331,857 323,090Commercial automobile156,817 165,560Professional liability118,225 110,984Total Insurance1,375,358 1,311,276 Reinsurance: Casualty100,334 112,816Property51,643 47,921Total Reinsurance151,977 160,737 Total$1,527,335 $1,472,013