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 June 30, 2013

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 July 31, 2013: 135,317,930

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-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)

	June 30, 2013			December 31, 2012
	(Unaudited)
Assets
Investments:
Fixed maturity securities	$	11,635,178		$	11,943,956
Equity securities	434,841			376,022
Arbitrage trading account	680,713			329,077
Investment funds	858,394			809,689
Loans receivable	359,177			401,961
Real estate	589,936			606,735
Total investments	14,558,239			14,467,440
Cash and cash equivalents	658,839			905,670
Premiums and fees receivable	1,582,395			1,440,752
Due from reinsurers	1,477,381			1,450,348
Accrued investment income	126,122			127,230
Prepaid reinsurance premiums	382,570			316,309
Deferred policy acquisition costs	433,274			404,047
Real estate, furniture and equipment	291,831			267,227
Federal and foreign income taxes - current and deferred	67,666			—
Goodwill	112,741			87,865
Trading account receivables from brokers and clearing organizations	144,150			446,873
Other assets	376,334			242,135
Total assets	$	20,211,542		$	20,155,896
Liabilities and Equity
Liabilities:
Reserves for losses and loss expenses	$	9,921,072		$	9,751,086
Unearned premiums	2,721,228			2,474,847
Due to reinsurers	337,370			316,388
Trading account securities sold but not yet purchased	171,990			121,487
Federal and foreign income taxes - current and deferred	—			82,801
Other liabilities	758,627			959,080
Junior subordinated debentures	339,614			243,206
Senior notes and other debt	1,695,986			1,871,535
Total liabilities	15,945,887			15,820,430
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, 135,308,430 and 136,017,732 shares, respectively	47,024			47,024
Additional paid-in capital	956,084			945,166
Retained earnings	5,024,565			4,817,807
Accumulated other comprehensive income	210,225			465,631
Treasury stock, at cost, 99,809,488 and 99,100,186 shares, respectively	(1,999,294		)	(1,969,411		)
Total stockholders’ equity	4,238,604			4,306,217
Noncontrolling interests	27,051			29,249
Total equity	4,265,655			4,335,466
Total liabilities and equity	$	20,211,542		$	20,155,896

See accompanying notes to interim consolidated financial statements.

1

W. R. BERKLEY CORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED)

(In thousands, except per share data)

	For the Three Months Ended						For the Six Months Ended
	June 30,						June 30,
	2013			2012			2013			2012
REVENUES:
Net premiums written	$	1,341,898		$	1,190,991		$	2,718,864		$	2,394,517
Change in net unearned premiums	(59,383		)	(43,634		)	(204,230		)	(147,509		)
Net premiums earned	1,282,515			1,147,357			2,514,634			2,247,008
Net investment income	143,737			161,250			279,666			318,869
Insurance service fees	27,652			27,036			54,388			50,913
Net investment gains	33,058			24,286			53,027			67,763
Change in valuation allowance, net of other-than-temporary impairments	—			—			—			4,014
Revenues from wholly-owned investees	83,775			55,434			175,510			105,109
Other income	225			384			506			776
Total revenues	1,570,962			1,415,747			3,077,731			2,794,452
OPERATING COSTS AND EXPENSES:
Losses and loss expenses	805,470			731,202			1,550,149			1,410,674
Other operating costs and expenses	494,286			448,758			975,890			880,537
Expenses from wholly-owned investees	81,293			54,931			170,445			106,261
Interest expense	31,207			32,417			62,318			61,238
Total operating costs and expenses	1,412,256			1,267,308			2,758,802			2,458,710
Income before income taxes	158,706			148,439			318,929			335,742
Income tax expense	(43,579		)	(39,535		)	(87,204		)	(91,606		)
Net income before noncontrolling interests	115,127			108,904			231,725			244,136
Noncontrolling interests	830			(66		)	847			20
Net income to common stockholders	$	115,957		$	108,838		$	232,572		$	244,156
NET INCOME PER SHARE:
Basic	$	0.85		$	0.79		$	1.71		$	1.77
Diluted	$	0.82		$	0.76		$	1.65		$	1.70

See accompanying notes to interim consolidated financial statements.

2

W. R. BERKLEY CORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (UNAUDITED)

(In thousands)

	For the Three Months Ended						For the Six Months Ended
	June 30,						June 30,
	2013			2012			2013			2012
Net income before noncontrolling interests	$	115,127		$	108,904		$	231,725		$	244,136
Other comprehensive income (loss):
Change in unrealized translation adjustments	(23,156		)	(17,257		)	(69,779		)	(1,674		)
Change in unrealized investment gains (losses), net of taxes	(197,060		)	39,535			(189,250		)	61,559
Change in net pension asset, net of taxes	1,814			823			3,628			1,647
Other comprehensive income (loss)	(218,402		)	23,101			(255,401		)	61,532
Comprehensive income (loss)	(103,275		)	132,005			(23,676		)	305,668
Comprehensive (income) loss to the noncontrolling interest	865			(71		)	842			(8		)
Comprehensive income (loss) to common stockholders	$	(102,410	)	$	131,934		$	(22,834	)	$	305,660

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 Six Months Ended
	June 30,
	2013			2012
COMMON STOCK:
Beginning and end of period	$	47,024		$	47,024
ADDITIONAL PAID-IN CAPITAL:
Beginning of period	$	945,166		$	941,109
Stock options exercised and restricted stock units issued, net of tax	(311		)	(12,092		)
Restricted stock units expensed	10,694			14,792
Stock issued to directors	535			454
End of period	$	956,084		$	944,263
RETAINED EARNINGS:
Beginning of period	$	4,817,807		$	4,491,162
Net income to common stockholders	232,572			244,156
Dividends	(25,814		)	(23,482		)
End of period	$	5,024,565		$	4,711,836
ACCUMULATED OTHER COMPREHENSIVE INCOME:
Unrealized investment gains:
Beginning of period	$	517,658		$	430,419
Unrealized gains (losses) on securities not other-than-temporarily impaired	(189,594		)	60,275
Unrealized gains on other-than-temporarily impaired securities	339			1,256
End of period	328,403			491,950
Currency translation adjustments:
Beginning of period	(36,676		)	(61,239		)
Net change in period	(69,779		)	(1,674		)
End of period	(106,455		)	(62,913		)
Net pension asset:
Beginning of period	(15,351		)	(14,329		)
Net change in period	3,628			1,647
End of period	(11,723		)	(12,682		)
Total accumulated other comprehensive income	$	210,225		$	416,355
TREASURY STOCK:
Beginning of period	$	(1,969,411	)	$	(1,880,790	)
Stock exercised/vested	882			23,393
Stock repurchased	(31,362		)	(54,878		)
Stock issued to directors	597			581
End of period	$	(1,999,294	)	$	(1,911,694	)
NONCONTROLLING INTERESTS:
Beginning of period	$	29,249		$	7,526
Contributions (distributions)	(1,356		)	1,524
Net income	(847		)	(20		)
Other comprehensive income, net of tax	5			28
End of period	$	27,051		$	9,058

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 Six Months Ended
	June 30,
	2013			2012
CASH FROM OPERATING ACTIVITIES:
Net income to common stockholders	$	232,572		$	244,156
Adjustments to reconcile net income to net cash from operating activities:
Net investment gains	(53,027		)	(71,777		)
Depreciation and amortization	50,617			47,147
Noncontrolling interests	(847		)	(20		)
Investment funds	(33,057		)	(63,243		)
Stock incentive plans	12,395			15,827
Change in:
Arbitrage trading account	1,590			(1,535		)
Premiums and fees receivable	(162,853		)	(139,183		)
Reinsurance accounts	(67,447		)	(46,182		)
Deferred policy acquisition costs	(34,039		)	(21,637		)
Income taxes	(46,642		)	20,963
Reserves for losses and loss expenses	221,525			151,975
Unearned premiums	269,931			188,902
Other	(76,786		)	(12,982		)
Net cash from operating activities	313,932			312,411
CASH FROM (USED IN) INVESTING ACTIVITIES:
Proceeds from sale of fixed maturity securities	555,694			370,902
Proceeds from sale of equity securities	66,969			70,274
Distributions from (contributions to) investment funds	(60,000		)	23,090
Proceeds from maturities and prepayments of fixed maturity securities	1,561,236			922,961
Purchase of fixed maturity securities	(2,214,201		)	(1,658,418		)
Purchase of equity securities	(111,540		)	(184,751		)
Real estate purchased	(13,390		)	(15,475		)
Change in loans receivable	(46,854		)	(61,886		)
Net additions to real estate, furniture and equipment	(43,446		)	(20,376		)
Change in balances due to (from) security brokers	(6,167		)	38,700
Cash distributed in connection with business disposition	(21,408		)
Payment for business purchased, net of cash acquired	(38,556		)	—
Net cash from (used in) investing activities	(371,663		)	(514,979		)
CASH FROM (USED IN) FINANCING ACTIVITIES:
Repayment of senior notes and other debt	(486,297		)	—
Net proceeds from issuance of debt	371,923			364,044
Net proceeds from stock options exercised	51			4,776
Cash dividends to common stockholders	(12,243		)	(11,042		)
Purchase of common treasury shares	(31,362		)	(48,346		)
Other, net	7,273			19,500
Net cash from (used in) financing activities	(150,655		)	328,932
Net impact on cash due to change in foreign exchange rates	(38,445		)	(25,886		)
Net change in cash and cash equivalents	(246,831		)	100,478
Cash and cash equivalents at beginning of year	905,670			911,742
Cash and cash equivalents at end of period	$	658,839		$	1,012,220

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 accompanying unaudited consolidated financial statements of W. R. Berkley Corporation and its subsidiaries (the “Company”) have been prepared in accordance with 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 requires the use of management estimates. 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, 2012. Reclassifications have been made in the 2012 financial statements as originally reported to conform to the presentation of the 2013 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:

(In thousands)	For the Three Months Ended		For the Six Months Ended
	June 30,		June 30,
	2013	2012	2013	2012
Basic	135,894	138,181	135,959	137,997
Diluted	141,274	143,528	141,257	143,506

(3) Recent Accounting Pronouncements

In February 2013, the Financial Accounting Standards Board issued ASU 2013-02 relating to disclosures about items reclassified out of accumulated other comprehensive income ("AOCI"). The Company’s adoption of the updated guidance effective January 1, 2013 resulted in a change in the disclosures for AOCI in the Company’s consolidated financial statements but did not have any impact on the Company’s results of operations, financial position or liquidity.

All 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.

(4) Acquisitions

In 2012, the Company acquired a 49% interest in a worldwide supplier of after-market original equipment manufacturer (OEM) parts, systems and custom logistic support services for military aircraft operations for $43 million. In January 2013, the Company acquired the remaining 51% of this business for $43 million. The estimated useful lives of the intangible assets acquired range from 2 years to 15 years, with approximately $3 million having an indefinite life.

6

The following table summarizes the estimated fair value of net assets acquired and liabilities assumed at the date of acquisition:

(In thousands)	Acquired in 2013
Cash and cash equivalents	$	3,911
Real estate, furniture and equipment	898
Goodwill	19,664
Intangible assets	44,800
Other assets	60,661
Total assets acquired	129,934
Debt	(27,612		)
Other liabilities assumed	(17,076		)
Net assets acquired	$	85,246

7

(5) Statement of Comprehensive Income (Loss)

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

	Unrealized Investment Gains				Currency Translation Adjustments			Net Pension Asset				Accumulated Other Comprehensive Income (Loss)
As of and for the six months ended June 30, 2013:
(In thousands)
Changes in AOCI
Beginning of period	$	517,658			$	(36,676	)	$	(15,351	)		$	465,631
Other comprehensive income (loss) before reclassifications	(161,945		)		(69,779		)	—				(231,724		)
Amounts reclassified from AOCI	(27,305		)		—			3,628				(23,677		)
Other comprehensive income (loss)	(189,250		)		(69,779		)	3,628				(255,401		)
Unrealized investment gain related to non-controlling interest	(5		)		—			—				(5		)
End of period	$	328,403			$	(106,455	)	$	(11,723	)		$	210,225
Amounts reclassified from AOCI
Pre-tax	$	(42,008	)	(1)	$	—		$	5,582		(2)	$	(36,426	)
Tax effect (3)	14,703				—			(1,954		)		12,749
After-tax amounts reclassified	$	(27,305	)		$	—		$	3,628			$	(23,677	)
Other comprehensive income (loss)
Pre-tax	$	(291,154	)		$	(69,779	)	$	5,582			$	(355,351	)
Tax effect	101,904				—			(1,954		)		99,950
Other comprehensive income (loss)	$	(189,250	)		$	(69,779	)	$	3,628			$	(255,401	)
As of and for the three months ended June 30, 2013:
Changes in AOCI
Beginning of period	$	525,428			$	(83,299	)	$	(13,537	)		$	428,592
Other comprehensive income (loss) before reclassifications	(182,934		)		(23,156		)	—				(206,090		)
Amounts reclassified from AOCI	(14,126		)		—			1,814				(12,312		)
Other comprehensive income (loss)	(197,060		)		(23,156		)	1,814				(218,402		)
Unrealized investment gain related to non-controlling interest	35							—				35
End of period	$	328,403			$	(106,455	)	$	(11,723	)		$	210,225
Amounts reclassified from AOCI
Pre-tax	$	(21,933	)		$	—		$	2,790			$	(19,143	)
Tax effect (3)	7,807				—			(976		)		6,831
After-tax amounts reclassified	$	(14,126	)		$	—		$	1,814			$	(12,312	)
Other comprehensive income (loss)
Pre-tax	$	(303,169	)		$	(23,156	)	$	2,790			$	(323,535	)
Tax effect	106,109				—			(976		)		105,133
Other comprehensive income (loss)	$	(197,060	)		$	(23,156	)	$	1,814			$	(218,402	)

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

(2) Other operating costs and expenses in the consolidated statements of operations.

(3) Income tax expense in the consolidated statements of operations.

8

(6) Statements of Cash Flow

Interest payments were $65,365,000 and $55,616,000 and income taxes paid were $137,618,000 and $68,118,000 in the six months ended June 30, 2013 and 2012, respectively.

(7) Investments in Fixed Maturity Securities

At June 30, 2013 and December 31, 2012, investments in fixed maturity securities were as follows:

(In thousands)	Amortized Cost		Gross Unrealized					Fair Value		Carrying Value
			Gains		Losses
June 30, 2013
Held to maturity:
State and municipal	$	67,092	$	12,680	$	—		$	79,772	$	67,092
Residential mortgage-backed	29,661		4,010		—			33,671		29,661
Corporate	4,997		514		—			5,511		4,997
Total held to maturity	101,750		17,204		—			118,954		101,750
Available for sale:
U.S. government and government agency	799,530		46,703		(2,131		)	844,102		844,102
State and municipal	3,961,116		203,398		(17,262		)	4,147,252		4,147,252
Mortgage-backed securities:
Residential (1)	1,361,874		35,711		(18,885		)	1,378,700		1,378,700
Commercial	177,325		4,915		(1,187		)	181,053		181,053
Corporate	3,749,727		134,148		(23,013		)	3,860,862		3,860,862
Foreign	1,050,712		77,600		(6,853		)	1,121,459		1,121,459
Total available for sale	11,100,284		502,475		(69,331		)	11,533,428		11,533,428
Total investments in fixed maturity securities	$	11,202,034	$	519,679	$	(69,331	)	$	11,652,382	$	11,635,178
December 31, 2012
Held to maturity:
State and municipal	$	65,190	$	18,529	$	—		$	83,719	$	65,190
Residential mortgage-backed	32,764		5,286		—			38,050		32,764
Corporate	4,997		605		—			5,602		4,997
Total held to maturity	102,951		24,420		—			127,371		102,951
Available for sale:
U.S. government and government agency	827,591		72,532		(1,660		)	898,463		898,463
State and municipal	4,449,238		328,974		(9,693		)	4,768,519		4,768,519
Mortgage-backed securities:
Residential (1)	1,395,739		53,846		(7,456		)	1,442,129		1,442,129
Commercial	268,671		5,641		(744		)	273,568		273,568
Corporate	3,144,480		214,322		(12,083		)	3,346,719		3,346,719
Foreign	1,029,284		83,347		(1,024		)	1,111,607		1,111,607
Total available for sale	11,115,003		758,662		(32,660		)	11,841,005		11,841,005
Total investments in fixed maturity securities	$	11,217,954	$	783,082	$	(32,660	)	$	11,968,376	$	11,943,956

___________

(1) Gross unrealized losses for residential mortgage-backed securities include $2,515,000 and $3,037,000 as of June 30, 2013 and December 31, 2012, respectively, related to the non-credit portion of other-than-temporary impairments (“OTTI”) recognized in other comprehensive income.

9

The amortized cost and fair value of fixed maturity securities at June 30, 2013, 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	$	900,989	$	925,233
Due after one year through five years	3,555,283		3,697,764
Due after five years through ten years	2,686,863		2,853,103
Due after ten years	2,490,039		2,582,858
Mortgage-backed securities	1,568,860		1,593,424
Total	$	11,202,034	$	11,652,382

At June 30, 2013, there were no investments, other than investments in United States government and government agency securities, which exceeded 10% of common stockholders’ equity.

(8) Investments in Equity Securities

At June 30, 2013 and December 31, 2012, investments in equity securities were as follows:

(In thousands)	Cost		Gross Unrealized					Fair Value		Carrying Value
			Gains		Losses
June 30, 2013
Common stocks	$	275,719	$	60,277	$	(5,360	)	$	330,636	$	330,636
Preferred stocks	82,905		25,684		(4,384		)	104,205		104,205
Total	$	358,624	$	85,961	$	(9,744	)	$	434,841	$	434,841
December 31, 2012
Common stocks	$	222,671	$	60,102	$	(707	)	$	282,066	$	282,066
Preferred stocks	85,504		10,103		(1,651		)	93,956		93,956
Total	$	308,175	$	70,205	$	(2,358	)	$	376,022	$	376,022

(9) Arbitrage Trading Account

At June 30, 2013 and December 31, 2012, the carrying value of the arbitrage trading account was $681 million and $329 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 believes that this makes arbitrage investments less vulnerable to changes in general financial market conditions.

10

(10) Net Investment Income

Net investment income consists of the following:

	For the Three Months Ended						For the Six Months Ended
	June 30,						June 30,
(In thousands)	2013			2012			2013			2012
Investment income earned on:
Fixed maturity securities, including cash and cash equivalents and loans receivable	$	111,203		$	119,835		$	229,039		$	239,123
Investment funds	22,576			35,619			33,510			63,242
Arbitrage trading account	4,990			60			8,773			6,541
Equity securities available for sale	3,634			3,829			5,881			6,979
Real estate	3,116			3,348			6,257			5,524
Gross investment income	145,519			162,691			283,460			321,409
Investment expense	(1,782		)	(1,441		)	(3,794		)	(2,540		)
Net investment income	$	143,737		$	161,250		$	279,666		$	318,869

(11) Investment Funds

Investment funds consist of the following:

	Carrying Value as of				Income (Losses) from Investment Funds
	June 30,		December 31,		For the Six Months Ended June 30,
(In thousands)	2013		2012		2013		2012
Real estate	$	381,855	$	373,259	$	1,260	$	11,290
Energy	146,966		146,325		25,199		49,780
Arbitrage	65,651		63,920		1,731		(662		)
Other	263,922		226,185		5,320		2,834
Total	$	858,394	$	809,689	$	33,510	$	63,242

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.

(12) Real Estate

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

	Carrying Value
	June 30,		December 31,
(In thousands)	2013		2012
Properties in operation	$	265,884	$	282,899
Properties under development	324,052		323,836
Total	$	589,936	$	606,735

The primary properties in operation are an office building in London and a long-term ground lease in Washington D.C. These properties are net of accumulated depreciation and amortization of $13,027,000 and $10,354,000, as of June 30, 2013 and December 31, 2012, respectively. Related depreciation expense was $3,420,000 and $3,781,000 for the six months ended June 30, 2013 and 2012, respectively. Future minimum rental income expected on operating leases relating to real estate held for investment is $737,000 in 2013, $1,504,000 in 2014, $1,549,000 in 2015, $1,596,000 in 2016, $1,644,000 in 2017 and $329,013,000 thereafter.

11

The properties under development are 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.

(13) Loans Receivable

Loans receivable are as follows:

(In thousands)	June 30, 2013			December 31, 2012
Loans receivable	$	359,177		$	401,961
Valuation allowance:
Specific	$	—		$	3,000
General	1,844			2,620
Total	$	1,844		$	5,620
Impaired loans:
With a specific valuation allowance	$	—		$	1,775
Without a valuation allowance	30,000			31,023
Unpaid principal balance	30,000			35,872
For the six months ended June 30:	2013			2012
Increase in valuation allowance	$	65		$	6,773
Loans receivable charged off	—			85
For the three months ended June 30:
Increase (decrease) in valuation allowance	(30		)	123
Loans receivable charged off	—			—

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 Company's six largest loans receivable, which have an aggregate amortized cost of $244 million and an aggregate fair value of $247 million at June 30, 2013, are secured by commercial real estate located primarily in New York City, California, Hawaii and Chicago. These loans earn interest at floating LIBOR-based interest rates and have maturities (inclusive of extension options) through August 2025.

The Company utilizes an internal risk rating system to assign a risk to each of its commercial loans. The loan rating system takes into consideration credit quality indicators including loan to value ratios, which compare the outstanding loan amount to the estimated value of the property, the borrower's financial condition and performance with respect to loan terms, the Company's position in the capital structure, and the overall leverage in the capital structure. Based on this rating system, one loan with an aggregate cost basis of $30 million was considered to be impaired at June 30, 2013. A determination was made as to the amount of loss in the event of a default and whether the loss is probable. The results of the determination were considered in connection with the valuation allowance noted above.

12

(14) Realized and Unrealized Investment Gains and Losses

Realized and unrealized investment gains and losses are as follows:

	For the Three Months Ended June 30,						For the Six Months Ended June 30,
(In thousands)	2013			2012			2013			2012
Realized investment gains and losses:
Fixed maturity securities:
Gains	$	9,147		$	5,652		$	20,143		$	20,607
Losses	(5,500		)	(1,763		)	(11,466		)	(2,306		)
Equity securities available for sale	18,086			18,188			33,331			44,426
Investment funds	10,843			2,191			11,037			3,501
Other	482			18			(18		)	1,535
Total	33,058			24,286			53,027			67,763
Change in valuation allowance, net other-than-temporary impairments:
Decrease in valuation allowance	—			—			—			6,998
Other-than-temporary impairments	—			—			—			(2,984		)
Total	—			—			—			4,014
Net investment gains	33,058			24,286			53,027			71,777
Income tax expense	(11,570		)	(8,436		)	(18,559		)	(24,845		)
Total after-tax investment gains	$	21,488		$	15,850		$	34,468		$	46,932

Change in unrealized investment gains and losses:
Fixed maturity securities	$	(277,791	)	$	71,138		$	(293,380	)	$	90,560
Previously impaired fixed maturity securities	(590		)	190			522			1,933
Equity securities available for sale	(16,191		)	(8,518		)	8,370			3,077
Investment funds	(5,906		)	(2,651		)	(9,174		)	(974		)
Total change in unrealized investment gains and losses	(300,478		)	60,159			(293,662		)	94,596
Income tax benefit (expense)	103,418			(20,624		)	104,412			(33,037		)
Noncontrolling interests	35			(5		)	(5		)	(28		)
Total after-tax unrealized gains and losses	$	(197,025	)	$	39,530		$	(189,255	)	$	61,531

13

(15) Securities in an Unrealized Loss Position

The following table summarizes all securities in an unrealized loss position at June 30, 2013 and December 31, 2012 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
June 30, 2013
U.S. government and agency	$	109,891	$	2,131	$	—	$	—	$	109,891	$	2,131
State and municipal	528,045		14,077		67,266		3,185		595,311		17,262
Mortgage-backed securities	612,369		16,308		54,843		3,764		667,212		20,072
Corporate	1,166,097		13,102		67,142		9,911		1,233,239		23,013
Foreign	249,199		6,853		—		—		249,199		6,853
Fixed maturity securities	2,665,601		52,471		189,251		16,860		2,854,852		69,331
Common stocks	77,610		5,360		—		—		77,610		5,360
Preferred stocks	17,702		346		21,636		4,038		39,338		4,384
Equity securities	95,312		5,706		21,636		4,038		116,948		9,744
Total	$	2,760,913	$	58,177	$	210,887	$	20,898	$	2,971,800	$	79,075
December 31, 2012
U.S. government and agency	$	69,551	$	1,660	$	—	$	—	$	69,551	$	1,660
State and municipal	152,694		1,639		135,967		8,054		288,661		9,693
Mortgage-backed securities	484,731		3,629		58,292		4,571		543,023		8,200
Corporate	371,781		2,964		70,537		9,119		442,318		12,083
Foreign	95,623		996		11,210		28		106,833		1,024
Fixed maturity securities	1,174,380		10,888		276,006		21,772		1,450,386		32,660
Common stocks	46,725		707		—		—		46,725		707
Preferred stocks	—		—		39,812		1,651		39,812		1,651
Equity securities	46,725		707		39,812		1,651		86,537		2,358
Total	$	1,221,105	$	11,595	$	315,818	$	23,423	$	1,536,923	$	35,018

Fixed Maturity Securities – A summary of the Company’s non-investment grade fixed maturity securities that were in an unrealized loss position at June 30, 2013 is presented in the table below.

($ in thousands)	Number of Securities	Aggregate Fair Value		Gross Unrealized Loss
Mortgage-backed securities	18	$	106,405	$	5,246
Corporate	9	26,685		4,067
State and municipal	2	18,361		47
Foreign	2	19,337		240
Total	31	$	170,788	$	9,600

For OTTI of fixed maturity securities that management does not intend to sell or, more likely than not, would not be required to sell, the portion of the decline in value considered to be due to credit factors is recognized in earnings and the portion of the decline in value considered to be due to non-credit factors is recognized in other comprehensive income. For the six months ended June 30, 2013 and 2012, there were no changes in the portion of impairments recognized in earnings for those securities that have been impaired due to both credit factors and non-credit factors.

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.

14

Preferred Stocks – At June 30, 2013, there were three preferred stocks in an unrealized loss position, with an aggregate fair value of $39 million and a gross unrealized loss of $4 million. Based upon management’s view of the underlying value of these securities, the Company does not consider these preferred stocks to be OTTI.

Common Stocks – At June 30, 2013, the Company owned six common stocks in an unrealized loss position with an aggregate fair value of $78 million and an aggregate unrealized loss of $5 million. The Company does not consider these common stocks to be OTTI.

(16)Fair Value Measurements

The Company’s fixed maturity and equity securities available for sale and its arbitrage 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.

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, 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 projections, credit quality and business developments of the issuer and other relevant information.

15

The following tables present the assets and liabilities measured at fair value, on a recurring basis, as of June 30, 2013 and December 31, 2012 by Level:

(In thousands)	Total		Level 1		Level 2		Level 3
June 30, 2013
Assets:
Fixed maturity securities available for sale:
U.S. government and agency	$	844,102	$	—	$	844,102	$	—
State and municipal	4,147,252		—		4,147,252		—
Mortgage-backed securities	1,559,753		—		1,559,753		—
Corporate	3,860,862		—		3,809,941		50,921
Foreign	1,121,459		—		1,121,459		—
Total fixed maturity securities available for sale	11,533,428		—		11,482,507		50,921
Equity securities:
Common stocks	330,636		329,398		—		1,238
Preferred stocks	104,205		—		100,428		3,777
Total equity securities	434,841		329,398		100,428		5,015
Arbitrage trading account	680,713		179,841		500,789		83
Total	$	12,648,982	$	509,239	$	12,083,724	$	56,019
Liabilities:
Securities sold but not yet purchased	$	171,990	$	117,636	$	54,354	$	—
December 31, 2012
Assets:
Fixed maturity securities available for sale:
U.S. government and agency	$	898,463	$	—	$	898,463	$	—
State and municipal	4,768,519		—		4,768,519		—
Mortgage-backed securities	1,715,697		—		1,715,697		—
Corporate	3,346,719		—		3,287,654		59,065
Foreign	1,111,607		—		1,111,607		—
Total fixed maturity securities available for sale	11,841,005		—		11,781,940		59,065
Equity securities:
Common stocks	282,066		280,658		—		1,408
Preferred stocks	93,956		—		93,335		621
Total equity securities	376,022		280,658		93,335		2,029
Arbitrage trading account	329,077		233,603		94,546		928
Total	$	12,546,104	$	514,261	$	11,969,821	$	62,022
Liabilities:
Securities sold but not yet purchased	$	121,487	$	114,909	$	6,558	$	20

There were no significant transfers between Levels 1 and 2 during the six months ended June 30, 2013 or during the year ended December 31, 2012.

16

The following tables summarize changes in Level 3 assets and liabilities for the six months ended June 30, 2013 and for the year ended December 31, 2012:

			Gains (Losses) Included in
(In thousands)	Beginning Balance		Earnings			Other Comprehensive Income			Purchases		(Sales)			Maturities			Transfer in		Ending Balance
Six months ended June 30, 2013:
Assets:
Fixed maturities available for sale:
Corporate	$	59,065	$	(64	)	$	(867	)	$	84	$	(2,577	)	$	(4,720	)	$	—	$	50,921
Total	59,065		(64		)	(867		)	84		(2,577		)	(4,720		)	—		50,921
Equity securities available for sale:
Common stocks	1,408		—			—			—		(170		)	—			—		1,238
Preferred stocks	621		(274		)	—			3,430		—			—			—		3,777
Total	2,029		(274		)	—			3,430		(170		)	—			—		5,015
Arbitrage trading account	928		(815		)	—			824		(854		)	—			—		83
Total	$	62,022	$	(1,153	)	$	(867	)	$	4,338	$	(3,601	)	$	(4,720	)	$	—	$	56,019
Liabilities:
Securities sold but not yet purchased	$	20	$	(4	)	$	—		$	4	$	(20	)	$	—		$	—	$	—
Year ended December 31, 2012:
Assets:
Fixed maturities available for sale:
Corporate	$	67,828	$	(1,497	)	$	9,622		$	283	$	—		$	(17,171	)	$	—	$	59,065
Total	67,828		(1,497		)	9,622			283		—			(17,171		)	—		59,065
Equity securities available for sale:
Common stocks	1,559		—			—			—		(151		)	—			—		1,408
Preferred stocks	12,303		1,126			(1,737		)	—		(11,071		)	—			—		621
Total	13,862		1,126			(1,737		)	—		(11,222		)	—			—		2,029
Arbitrage trading account	851		(3,534		)	3,570			—		(52		)	—			93		928
Total	$	82,541	$	(3,905	)	$	11,455		$	283	$	(11,274	)	$	(17,171	)	$	93	$	62,022
Liabilities:
Securities sold but not yet purchased	$	21	$	(1	)	$	—		$	—	$	—		$	—		$	—	$	20

There were no significant transfers in or out of Level 3 during the six months ended June 30, 2013 or during the year ended December 31, 2012.

17

(17) Reinsurance

The following is a summary of reinsurance financial information:

	For the Three Months Ended						For the Six Months Ended
	June 30,						June 30,
(In thousands)	2013			2012			2013			2012
Written premiums:
Direct	$	1,405,183		$	1,249,576		$	2,805,595		$	2,450,595
Assumed	212,753			181,344			443,962			381,851
Ceded	(276,038		)	(239,929		)	(530,693		)	(437,929		)
Total net premiums written	$	1,341,898		$	1,190,991		$	2,718,864		$	2,394,517
Earned premiums:
Direct	$	1,301,702		$	1,163,162		$	2,542,264		$	2,267,118
Assumed	217,517			186,762			431,533			366,280
Ceded	(236,704		)	(202,567		)	(459,163		)	(386,390		)
Total net premiums earned	$	1,282,515		$	1,147,357		$	2,514,634		$	2,247,008
Ceded losses incurred	$	142,360		$	109,142		$	252,911		$	194,419

The Company reinsures a portion of its exposures principally to reduce its net liability on individual risks and to protect against catastrophic 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 $2 million as of June 30, 2013 and December 31, 2012.

(18) Fair Value of Financial Instruments

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

	June 30, 2013				December 31, 2012
(In thousands)	Carrying Value		Fair Value		Carrying Value		Fair Value
Assets:
Fixed maturity securities	$	11,635,178	$	11,652,382	$	11,943,956	$	11,968,376
Equity securities available for sale	434,841		434,841		376,022		376,022
Arbitrage trading account	680,713		680,713		329,077		329,077
Loans receivable	359,177		363,942		401,961		406,443
Cash and cash equivalents	658,839		658,839		905,670		905,670
Trading account receivables from brokers and clearing organizations	144,150		144,150		446,873		446,873
Due from broker	8,901		8,901		14,449		14,449
Liabilities:
Trading account securities sold but not yet purchased	171,990		171,990		121,487		121,487
Junior subordinated debentures	339,614		327,040		243,206		252,000
Senior notes and other debt	1,695,986		1,889,098		1,871,535		2,190,173

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 junior subordinated debentures is based on spreads for similar securities, which is considered a Level 2 input.

18

(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 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 $11 million and $15 million for the six months ended June 30, 2013 and 2012, respectively. Grants of RSUs are made periodically, generally every other year. A summary of RSUs issued in the six months ended June 30,2013 and 2012 follows:

($ in thousands)	Units	Fair Value
Six months ended June 30:
2013	55,150	$	2,312
2012	99,050	$	3,633

(20) Business Segments

The Company’s financial results are presented for the following reportable business segments:

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

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

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

During the first quarter of 2013, the Company changed the aggregation of its business segments. All domestic insurance operating companies, previously included in the Specialty, Regional and Alternative Markets segments, were aggregated into the Insurance-Domestic segment; all reinsurance operating companies were aggregated into the Reinsurance-Global segment; and all international insurance companies were aggregated into the Insurance-International 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, 2012, 2011 and 2010, and as of December 31, 2012 and 2011, 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.

19

Summary financial information about the Company's business segments is presented in the following tables.

	Revenues
(In thousands)	Earned Premiums		Investment Income			Other		Total		Pre-Tax Income (Loss)			Net Income (Loss)
Three months ended June 30, 2013:
Insurance-Domestic	$	925,997	$	107,562		$	27,652	$	1,061,211	$	152,334		$	106,478
Insurance-International	180,192		13,171			—		193,363		12,583			9,092
Reinsurance-Global	176,326		23,036			—		199,362		24,752			17,681
Corporate and eliminations (1)	—		(32		)	84,000		83,968		(64,021		)	(38,782		)
Net investment gains	—		—			33,058		33,058		33,058			21,488
Total	$	1,282,515	$	143,737		$	144,710	$	1,570,962	$	158,706		$	115,957
Three months ended June 30, 2012:
Insurance-Domestic	$	846,734	$	120,656		$	27,036	$	994,426	$	144,640		$	103,435
Insurance-International	154,501		11,194			—		165,695		13,782			9,833
Reinsurance-Global	146,122		28,451			—		174,573		27,454			20,055
Corporate and eliminations (1)	—		949			55,818		56,767		(61,723		)	(40,335		)
Net investment gains	—		—			24,286		24,286		24,286			15,850
Total	$	1,147,357	$	161,250		$	107,140	$	1,415,747	$	148,439		$	108,838
Six months ended June 30, 2013:
Insurance-Domestic	$	1,810,375	$	205,359		$	54,388	$	2,070,122	$	293,684		$	205,886
Insurance-International	351,311		25,232			—		376,543		34,965			24,569
Reinsurance-Global	352,948		45,535			—		398,483		62,693			44,075
Corporate and eliminations (1)	—		3,540			176,016		179,556		(125,440		)	(76,426		)
Net investment gains	—		—			53,027		53,027		53,027			34,468
Total	$	2,514,634	$	279,666		$	283,431	$	3,077,731	$	318,929		$	232,572
Six months ended June 30, 2012:
Insurance-Domestic	$	1,656,803	$	232,742		$	50,913	$	1,940,458	$	292,375		$	209,315
Insurance-International	298,386		21,525			—		319,911		29,481			20,945
Reinsurance-Global	291,819		57,138			—		348,957		59,092			43,141
Corporate and eliminations (1)	—		7,464			105,885		113,349		(116,983		)	(76,177		)
Net investment gains	—		—			71,777		71,777		71,777			46,932
Total	$	2,247,008	$	318,869		$	228,575	$	2,794,452	$	335,742		$	244,156

___________

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

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Identifiable assets by segment are as follows:

(In thousands)	June 30, 2013		December 31, 2012
Insurance-Domestic	$	14,849,126	$	14,661,476
Insurance-International	1,449,188		1,541,365
Reinsurance-Global	2,965,565		3,337,937
Corporate and eliminations	947,663		615,118
Total	$	20,211,542	$	20,155,896

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

	For the Three Months Ended				For the Six Months Ended
	June 30,				June 30,
(In thousands)	2013		2012		2013		2012
Insurance-Domestic
Other liability	$	307,444	$	257,781	$	603,032	$	531,345
Workers’ compensation	241,191		224,562		470,202		414,106
Short-tail lines (1)	192,938		189,390		371,687		363,292
Commercial automobile	119,900		112,532		236,022		222,899
Products liability	64,524		62,469		129,432		125,161
Total	925,997		846,734		1,810,375		1,656,803
Insurance-International
Other liability	15,070		17,745		30,288		33,279
Workers’ compensation	21,746		19,898		44,635		38,516
Short-tail lines (1)	84,301		63,831		156,424		116,309
Commercial automobile	32,392		29,606		67,031		60,274
Products liability	26,683		23,421		52,933		50,008
Total	180,192		154,501		351,311		298,386
Reinsurance-Global
Casualty	122,117		103,274		243,444		208,363
Property	54,209		42,848		109,504		83,456
Total	176,326		146,122		352,948		291,819
Total	$	1,282,515	$	1,147,357	$	2,514,634	$	2,247,008

_____________________

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

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SAFE HARBOR STATEMENT

This is a “Safe Harbor” Statement under the Private Securities Litigation Reform Act of 1995. This document may contain forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Some of the forward-looking statements can be identified by the use of forward-looking words such as “believes,” “expects,” “potential,” “continued,” “may,” “will,” “should,” “seeks,” “approximately,” “predicts,” “intends,” “plans,” “estimates,” “anticipates,” or the negative version of those words or other comparable words. Any forward-looking statements contained herein, including statements related to our outlook for the industry and for our performance for the year 2013 and beyond, are based upon the Company’s historical performance and on current plans, estimates and expectations. The inclusion of this forward-looking information is not and 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; 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, real estate, merger arbitrage and private equity investments; 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 any legislative, regulatory, accounting or other initiatives taken in response to it, on our results and financial condition; 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 Act of 2002, as amended ("TRIA"), and the potential expiration of TRIA; the ability of our reinsurers to pay reinsurance recoverables owed to us; foreign currency and political risks relating to our international operations; other legislative and regulatory developments, including those related to business practices in the insurance industry; credit risk relating to our policyholders, independent agents and brokers; changes in the ratings assigned to us or our insurance company subsidiaries by rating agencies; the availability of dividends from our insurance company subsidiaries; our ability to attract and retain key personnel and qualified employees; 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 (“SEC”). These risks and uncertainties could cause our actual results for the year 2013 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 three business segments: Insurance-Domestic, Insurance-International and Reinsurance-Global. Our decentralized structure provides us with the flexibility to respond quickly and efficiently to local or specific market conditions and to pursue specialty business niches. It also allows us to be closer to our customers in order to better understand their individual needs and risk characteristics. While providing our business units with certain operating autonomy, our structure allows us to capitalize on the benefits of economies of scale through centralized capital, investment, reinsurance and enterprise risk management, and actuarial, financial and corporate legal staff support. 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, with 24 of our 49 units formed since 2006. These newer units are focused on important parts of the economy in the U.S., including healthcare, energy and agriculture, and on growing international markets, including Scandinavia, Australia, the Asia-Pacific region and South America. As a result, our international operations have become an increasingly important part of our business.

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

Beginning in 2005, the property casualty insurance market became more competitive and insurance rates decreased across most business lines. Increased competition and the impact of the economic downturn also put pressure on policy terms and conditions. While prices have increased since the beginning of 2011, 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. With its investments in new businesses, the Company believes it is well-positioned to take advantage of new opportunities. 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, which are derived from its own capital and cash flow from its insurance business, 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 also invests in equity securities, merger arbitrage, private equity investments, investment funds, loans receivable and real estate. The Company's investments in investment funds have experienced, and the Company expects to continue to experience, greater fluctuations in investment income.

In April 2013, a federal savings association that was 83% indirectly owned by the Company sold substantially all of its assets, and the Company deregistered as a savings and loan holding company.

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 unanticipated fluctuation. These estimates, which generally involve actuarial projections, are based on management’s assessment of facts and circumstances then known, as well as estimates of trends in claims severity and frequency, judicial theories of liability and other factors, including the actions of third parties which are beyond the Company’s control. These variables are affected by external and internal events, such as inflation and economic volatility, judicial and litigation trends, reinsurance coverage, legislative changes and claim handling and reserving practices, which make it more difficult to accurately predict claim costs. The inherent uncertainties of estimating reserves are greater for certain types of liabilities where long periods of time elapse before a definitive determination of liability is made. 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 historical changes, 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 2012 (dollars in thousands):

	Frequency (+/-)
Severity (+/-)	1%		5%		10%
1%	$	60,260	$	181,379	$	332,777
5%	181,379		307,294		464,689
10%	332,777		464,689		629,579

Our net reserves for losses and loss expenses of approximately $8.5 billion as of June 30, 2013 relate to multiple accident years. Therefore, the impact of changes in frequency or severity for more than one accident year could be significantly higher or lower than the amounts reflected above.

Approximately $1.6 billion, or 18.6%, of the Company’s net loss reserves as of June 30, 2013 relate to the Reinsurance-Global segment. There is a higher degree of uncertainty and greater variability regarding estimates of assumed loss reserves because those estimates are based, in part, upon information received from ceding companies. If information received from ceding companies is not timely or correct, the Company’s estimate of ultimate losses may not be accurate. Furthermore, due to delayed reporting of claim information by ceding companies, the claim settlement tail for assumed reinsurance is extended. Management considers the impact of delayed reporting in its selection of assumed loss development factors.

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

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Following is a summary of the Company’s reserves for losses and loss expenses by business segment as of June 30, 2013 and December 31, 2012:

(In thousands)	June 30,		December 31,
	2013		2012
Insurance-Domestic	$	6,408,972	$	6,297,773
Insurance-International	536,821		540,769
Reinsurance-Global	1,591,449		1,573,309
Net reserves for losses and loss expenses	8,537,242		8,411,851
Ceded reserves for losses and loss expenses	1,383,830		1,339,235
Gross reserves for losses and loss expenses	$	9,921,072	$	9,751,086

Following is a summary of the Company’s net reserves for losses and loss expenses by major line of business as of June 30, 2013 and December 31, 2012:

(In thousands)	Reported Case Reserves		Incurred But Not Reported		Total
June 30, 2013
Other liability	$	921,019	$	1,846,058	$	2,767,077
Workers’ compensation	1,464,543		1,143,743		2,608,286
Professional liability	299,348		323,602		622,950
Commercial automobile	269,163		202,436		471,599
Short-tail lines	235,770		240,111		475,881
Total primary	3,189,843		3,755,950		6,945,793
Reinsurance	647,585		943,864		1,591,449
Total	$	3,837,428	$	4,699,814	$	8,537,242
December 31, 2012
Other liability	$	922,568	$	1,863,465	$	2,786,033
Workers’ compensation	1,427,599		1,114,340		2,541,939
Professional liability	271,854		312,811		584,665
Commercial automobile	275,322		204,900		480,222
Short-tail lines	240,411		205,272		445,683
Total primary	3,137,754		3,700,788		6,838,542
Reinsurance	626,962		946,347		1,573,309
Total	$	3,764,716	$	4,647,135	$	8,411,851

Reserves for excess and assumed workers’ compensation business are net of an aggregate net discount of $851 million and $867 million as of June 30, 2013 and December 31, 2012, respectively.

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The following table presents development in our estimate of claims occurring in prior years:

	For the Six Months Ended
	June 30,
(In thousands)	2013			2012
Favorable (unfavorable) reserve development:
Insurance-Domestic	$	27,511		$	34,883
Insurance-International	(1,796		)	2,566
Reinsurance-Global	16,300			17,312
Total favorable reserve development	$	42,015		$	54,761

For the six months ended June 30, 2013, estimates for claims occurring in prior years decreased by $42 million. The favorable reserve development in 2013 was primarily attributable to accident years 2006 through 2012, and was partially offset by unfavorable reserve development for accident years prior to 2006. 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.

For Insurance-Domestic business, favorable reserve development in 2013 related primarily to excess and surplus lines casualty business, regional casualty business and excess professional liability business, including medical malpractice. This favorable reserve development was concentrated in accident years 2006 through 2010. The favorable reserve development was partially offset by unfavorable development in primary professional liability, including directors and officers liability, and aviation business.

For Insurance-International business, favorable reserve development in 2013 was primarily related to our minority participation in a Lloyd's syndicate that writes a broad range of mainly short-tail classes of business.

For Reinsurance-Global business, favorable reserve development in 2013 was primarily related to our minority participation in a Lloyd's syndicate that writes a broad range of mainly short-tail classes of business. This favorable development was concentrated in accident years 2011 through 2012.

The Company discounts its liabilities for excess and assumed workers’ compensation business because of the long period of time over which losses are paid. Discounting is intended to appropriately match losses and loss expenses to income earned on investment securities supporting the liabilities. The expected losses and loss expense payout pattern subject to discounting was derived from the Company’s loss payout experience. For non-proportional business, reserves for losses and loss expenses have been discounted using risk-free discount rates determined by reference to the U.S. Treasury yield curve. For proportional business, reserves for losses and loss expenses have been discounted at the statutory rate of 2.2%. As of June 30, 2013, the aggregate blended discount rates ranged from 2.1% to 6.5%, with a weighted average discount rate of 4.2%. The aggregate net discount, after reflecting the effects of ceded reinsurance, was $851 million and $867 million as of June 30, 2013 and December 31, 2012, respectively.

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 $57 million and $73 million at June 30, 2013 and December 31, 2012, respectively. The assumed premium estimates are based upon terms set forth in reinsurance agreements, information received from ceding companies during the underwriting and negotiation of agreements, reports received from ceding companies and discussions and correspondence with reinsurance intermediaries. The Company also considers its own view of market conditions, economic trends and experience with similar lines of business. These premium estimates represent management’s best estimate of the ultimate amount of premiums to be received under its assumed reinsurance agreements.

Other-Than-Temporary Impairments (OTTI) of Investments. The cost of securities is adjusted where appropriate to include a provision for decline in value which is considered to be other-than-temporary. An other-than-temporary decline is considered to occur in investments where there has been a sustained reduction in fair value and where the Company does not expect the fair value to recover prior to the time of sale or maturity. Since equity securities do not have a contractual cash flow or maturity, the Company considers whether the price of an equity security is expected to recover within a reasonable period of time.

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The Company classifies its fixed maturity securities and preferred stocks by credit rating, primarily based on ratings assigned by credit rating agencies. For purposes of classifying securities with different ratings, the Company uses the lower rating if two ratings were assigned and the middle rating if three ratings were assigned, unless the Company’s own analysis indicates that the lower rating is more appropriate. Securities that are not rated by a rating agency are evaluated and classified by the Company on a case-by-case basis.

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

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

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

The following table provides a summary of fixed maturity securities in an unrealized loss position as of June 30, 2013:

($ in thousands)	Number of Securities	Aggregate Fair Value		Unrealized Loss
Unrealized loss less than 20% of amortized cost	340	$	2,853,129	$	68,252
Unrealized loss of 20% or greater of amortized cost:
Less than twelve months	—	—		—
Twelve months and longer	6	1,723		1,079
Total	346	$	2,854,852	$	69,331

A summary of the Company’s non-investment grade fixed maturity securities that were in an unrealized loss position at June 30, 2013 is presented in the table below.

($ in thousands)	Number of Securities	Aggregate Fair Value		Gross Unrealized Loss
Mortgage-backed securities	18	$	106,405	$	5,246
Corporate	9	26,685		4,067
State and municipal	2	18,361		47
Foreign	2	19,337		240
Total	31	$	170,788	$	9,600

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 June 30, 2013, there were three preferred stocks in an unrealized loss position, with an aggregate fair value of $39 million and a gross unrealized loss of $4 million. Based upon management's view of the underlying value of these securities, the Company does not consider these preferred stocks to be OTTI.

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Common Stocks – At June 30, 2013, the Company owned six common stocks in an unrealized loss position with an aggregate fair value of $78 million and an aggregate unrealized loss of $5 million. The Company does not consider these common stocks 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 $2 million at June 30, 2013 and $6 million at December 31, 2012.

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.

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.

29

The following is a summary of pricing sources for the Company's fixed maturity securities available for sale as of June 30, 2013:

($ in thousands)	Carrying Value		Percent of Total
Pricing source:
Independent pricing services	$	10,369,655	90.0	%
Syndicate manager	97,590		0.8	%
Directly by the Company based on:
Observable data	1,015,261		8.8	%
Cash flow model	50,922		0.4	%
Total	$	11,533,428	100.0	%

Independent pricing services - The vast majority of the Company’s fixed maturity securities available for sale were priced by independent pricing services (generally one U.S. pricing service plus additional pricing services with respect to a limited number of foreign securities held by the Company). The prices provided by the independent pricing services are generally based on observable market data in active markets (e.g., broker quotes and prices observed for comparable securities). The determination of whether markets are active or inactive is based upon the volume and level of activity for a particular asset class. The Company reviews the prices provided by pricing services for reasonableness based upon current trading levels for similar securities. If the prices appear unusual to the Company, they are re-examined and the value is either confirmed or revised. In addition, the Company periodically performs independent price tests of a sample of securities to ensure proper valuation and to verify our understanding of how securities are priced. As of June 30, 2013, 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.

30

Results of Operations for the Six Months Ended June 30,2013 and 2012

Business Segment Results

Following is a summary of gross and net premiums written, 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 six months ended June 30,2013 and 2012. 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. See the further discussion of the change to our business segments in Note 20 to the interim consolidated financial statements.

($ in thousands)	2013			2012
Insurance-Domestic:
Gross premiums written	$	2,365,908		$	2,089,572
Net premiums written	1,953,964			1,752,262
Net premiums earned	1,810,375			1,656,803
Loss ratio	62.7		%	64.0		%
Expense ratio	32.8		%	33.0		%
GAAP combined ratio	95.5		%	97.0		%
Insurance-International:
Gross premiums written	$	493,313		$	417,566
Net premiums written	406,580			342,970
Net premiums earned	351,311			298,386
Loss ratio	58.5		%	57.8		%
Expense ratio	38.4		%	40.4		%
GAAP combined ratio	96.9		%	98.2		%
Reinsurance-Global:
Gross premiums written	$	390,336		$	325,308
Net premiums written	358,320			299,285
Net premiums earned	352,948			291,819
Loss ratio	59.4		%	60.9		%
Expense ratio	35.7		%	38.1		%
GAAP combined ratio	95.1		%	99.0		%
Consolidated:
Gross premiums written	$	3,249,557		$	2,832,446
Net premiums written	2,718,864			2,394,517
Net premiums earned	2,514,634			2,247,008
Loss ratio	61.6		%	62.8		%
Expense ratio	34.0		%	34.6		%
GAAP combined ratio	95.6		%	97.4		%

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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 six months ended June 30, 2013 and 2012:

(In thousands, except per share data)	2013		2012
Net income to common stockholders	$	232,572	$	244,156
Weighted average diluted shares	141,257		143,506
Net income per diluted share	$	1.65	$	1.70

The Company reported net income of $233 million in 2013 compared to $244 million in 2012. The decrease in net income was primarily due to decreases in after-tax net investment income of $27 million and in after-tax net investment gains of $12 million, partially offset by an increase in after-tax underwriting income of $33 million. The number of weighted average diluted shares decreased as a result of the Company’s repurchases of its common stock in 2012 and 2013.

Premiums. Gross premiums written were $3,250 million in 2013, an increase of 15% from $2,832 million in 2012. The growth was due to a combination of rate increases and increased exposures, including expansion into new geographic and product markets. Approximately 75.2% of policies expiring in 2013 were renewed, compared with a 77.3% renewal retention rate for policies expiring in 2012. The average rate (i.e., average premium adjusted for change in exposures) for policies that renewed in 2013 increased 7.2%. Audit premiums were $52 million in 2013 compared with $45 million in 2012.

From 2005 through 2010, the property casualty insurance market was highly competitive and insurance rates decreased across most business lines. Prices began to increase in 2011, and the rate of increase accelerated in 2012. Cumulatively, our average rates have increased 18% since 2010. However, overall loss costs are also generally increasing, and current market price levels for certain lines of business remain below the prices required for the Company to achieve its long-term return objectives. A summary of gross premiums written in 2013 compared with 2012 by line of business within each business segment follows:

• Insurance-Domestic gross premiums increased 13% to $2,366 million in 2013 from $2,090 million in 2012. Gross premiums increased $75 million (13%) for workers' compensation, $125 million (20%) for other liability, $33 million (7%) for short-tail lines, $24 million (16%) for professional liability and $19 million (8%) for commercial automobile.

• Insurance-International gross premiums increased 18% to $493 million in 2013 from $418 million in 2012. Gross premiums increased $64 million (31%) for short-tail lines, $6 million (15%) for workers' compensation and $6 million (9%) for professional liability.

• Reinsurance-Global gross premiums increased 20% to $390 million in 2013 from $325 million in 2012. Gross premiums increased $45 million (22%) for casualty business and $20 million (17%) for property business.

Net premiums written were $2,719 million in 2013, an increase of 14% from $2,395 million in 2012. Ceded reinsurance premiums as a percentage of gross written premiums were 16% in 2013 and 15% in 2012. The increase in the percentage of business ceded was due to expanded reinsurance protection for certain lines of business and to disproportionately higher growth by companies that purchase more reinsurance protection.

Premiums earned increased 12% to $2,515 million in 2013 from $2,247 million in 2012. Insurance premiums (including the impact of rate changes) are generally earned evenly over the policy term, and accordingly we expect to recognize recent rate increases over the upcoming quarters. Premiums earned in 2013 are related to business written during both 2013 and 2012.

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Net Investment Income. Following is a summary of net investment income for the six months ended June 30, 2013 and 2012:

($ in thousands)	Amount						Average Annualized Yield
	2013			2012			2013		2012
Fixed maturity securities, including cash and cash equivalents and loans receivable	$	229,039		$	239,123		3.7	%	3.8	%
Arbitrage trading account	8,773			6,541			3.6		4.2
Investment funds	33,510			63,242			8.5		19.8
Equity securities available for sale	5,881			6,979			3.7		3.6
Real estate	6,257			5,524			2.1		3.1
Gross investment income	283,460			321,409			3.9	%	4.5	%
Investment expenses	(3,794		)	(2,540		)
Total	$	279,666		$	318,869		3.8	%	4.4	%

Net investment income decreased 12% to $280 million in 2013 from $319 million in 2012. The decrease in investment income was primarily due to a decrease in income from energy and real estate funds (investment funds are reported on a one quarter lag) and lower interest income from fixed maturity securities. The average annualized yield for fixed maturity securities declined from 3.8% to 3.7% due to lower long-term reinvestment yields available in the market. We expect investment income on our fixed maturity portfolio to decline if interest rates remain at their current low levels. Average invested assets, at cost (including cash and cash equivalents) were $14.7 billion in 2013 and $14.3 billion in 2012.

Insurance Service Fees. The Company is a servicing carrier of workers' compensation assigned risk plans for 20 states and provides insurance program management services to self-insureds, captives, governmental entities, risk retention groups, and insurance companies. Service fees were $54 million in 2013, up from $51 million in 2012, primarily as a result of an increase in fees from assigned risk plans.

Net Realized Gains on Investment Sales. The Company buys and sells securities on a regular basis in order to maximize its total return on investments. Decisions to sell securities are based on management’s view of the underlying fundamentals of specific securities as well as management’s expectations regarding interest rates, credit spreads, currency values and general economic conditions. Net realized gains on investment sales were $53 million in 2013 compared with $68 million in 2012.

Change in Valuation Allowance, Net of Other-Than-Temporary Impairments. 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. The cost of securities is adjusted where appropriate to include a provision for a decline in value that is considered to be other-than-temporary. There were no other-than-temporary impairments in 2013 compared with $3 million in 2012. In 2012, the valuation allowance for mortgage loans decreased by $7 million; there was no change in the valuation allowance in 2013.

Revenues from Wholly-Owned Investees. Revenues from wholly-owned investees were derived from aviation-related businesses that provide services to the general aviation market, including fuel and line service, aircraft sales and maintenance, avionics and engineering services and parts fabrication. Revenues from wholly-owned investees increased to $176 million in 2013 from $105 million in 2012, primarily as a result of the acquisition of an aircraft equipment supplier in January 2013.

Losses and Loss Expenses. Losses and loss expenses increased to $1,550 million in 2013 from $1,411 million in 2012. The consolidated loss ratio was 61.6% in 2013, down from 62.8% in 2012. Catastrophe losses, net of reinsurance recoveries and reinstatement premiums, were $39 million in 2013 compared with $31 million in 2012. Favorable prior year reserve development was $42 million in 2013 compared with $55 million in 2012, a difference of 0.8 loss ratio points. The loss ratio excluding catastrophe losses and prior year reserve development decreased 2.2 points to 61.7% in 2013 from 63.9% in 2012 due to favorable pricing and loss cost trends. A summary of loss ratios in 2013 compared with 2012 by business segment follows:

• Insurance-Domestic - The loss ratio of 62.7% in 2013 was 1.3 points lower than the loss ratio of 64.0% in 2012. Catastrophe losses were $30 million in 2013, the same as in 2012. Favorable prior year reserve development was $28 million in 2013 compared with $35 million in 2012, a difference of 0.6 loss ratio points. The loss ratio excluding catastrophe losses and prior year reserve development decreased 1.8 points to 62.5% in 2013 from 64.3% in 2012.

• Insurance-International - The loss ratio of 58.5% in 2013 was 0.7 points higher than the loss ratio of 57.8% in 2012. Prior year reserves increased by $2 million in 2013 compared with favorable prior year development of $3 million in

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2012. The loss ratio excluding catastrophe losses and prior year reserve development decreased 1.6 points to 57.0% in 2013 from 58.6% in 2012.

• Reinsurance-Global - The loss ratio of 59.4% in 2013 was 1.5 points lower than the loss ratio of 60.9% in 2012. There were $6 million in catastrophe losses in 2013 compared with $1 million in 2012, an increase of 1.4 loss ratio points. Favorable prior year reserve development was $16 million in 2013 and $17 million in 2012. The loss ratio excluding catastrophe losses and prior year reserve development decreased 4.2 points to 62.5% in 2013 from 66.7% in 2012 due to lower property losses.

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

(In thousands)	2013			2012
Underwriting expenses	$	855,484		$	777,943
Service expenses	45,441			41,227
Debt extinguishment costs	6,709			—
Net foreign currency gains	(4,771		)	(1,297		)
Other costs and expenses	73,027			62,664
Total	$	975,890		$	880,537

Underwriting expenses are comprised of commissions paid to agents and brokers, premium taxes and other assessments and internal underwriting costs. Underwriting expenses increased 10% compared with an increase in net premiums earned of of 12%. The expense ratio (underwriting expenses expressed as a percentage of premiums earned) decreased 0.6 points to 34.0% in 2013 from 34.6% in 2012 due to a 12% increase in earned premiums. We expect our expense ratio to further improve over time if insurance prices continue to increase at current levels.

Service expenses, which represent the costs associated with the fee-based businesses, increased 10% to $45 million. The increase was due to an increase in general and administrative expenses related to fee-based business.

Debt extinguishment costs of $7 million in 2013 are unamortized debt issuance costs related to $250 million of 6.750% Subordinated Debentures that were due in 2045 and were prepaid in May 2013.

Net foreign currency gains result from transactions denominated in a currency other than the operating unit’s functional currency.

Other costs and expenses were $73 million in 2013 compared with $63 million in 2012. 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.

Expenses from Wholly-Owned Investees. Expenses from wholly-owned investees represent costs associated with aviation-related businesses that include cost of goods sold related to aircraft and other sales, labor and equipment costs related to repairs and other services and general and administrative expenses. Expenses from wholly-owned investees increased to $170 million in 2013 from $106 million in 2012 primarily due to an acquisition in January 2013.

Interest Expense. Interest expense was $62 million in 2013 compared with $61 million in 2012. The Company issued $350 million of 4.625% senior notes in March 2012 and repaid $200 million of 5.875% senior notes that matured in February 2013. In May 2013, the Company issued $350 million of 5.625% Subordinated Debentures due 2053 and prepaid $250 million of 6.750% Subordinated Debentures that were due in 2045.

Income Taxes. The effective income tax rate was 27% in 2013 and in 2012. 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 $110 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 $10 million, assuming all tax credits are realized, would be payable on such undistributed earnings and would be reflected in the tax provision for the year in which these earnings are no longer intended to be permanently reinvested in the foreign subsidiary.

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Results of Operations for the Three Months Ended June 30,2013 and 2012

Business Segment Results

Following is a summary of gross and net premiums written, 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 GAAP combined ratios (sum of loss ratio and expense ratio) for each of our business segments for the three months ended June 30, 2013 and 2012. 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. See the further discussion of the change to our business segments in Note 20 to the interim consolidated financial statements.

($ in thousands)	2013			2012
Insurance-Domestic:
Gross premiums written	$	1,186,186		$	1,051,138
Net premiums written	967,784			869,319
Net premiums earned	925,997			846,734
Loss ratio	62.9		%	65.1		%
Expense ratio	32.5		%	32.7		%
GAAP combined ratio	95.4		%	97.8		%
Insurance-International:
Gross premiums written	$	241,738		$	217,062
Net premiums written	201,445			174,976
Net premiums earned	180,192			154,501
Loss ratio	61.0		%	58.3		%
Expense ratio	38.9		%	40.5		%
GAAP combined ratio	99.9		%	98.8		%
Reinsurance-Global:
Gross premiums written	$	190,012		$	162,720
Net premiums written	172,669			146,696
Net premiums earned	176,326			146,122
Loss ratio	63.9		%	61.6		%
Expense ratio	35.1		%	38.6		%
GAAP combined ratio	99.0		%	100.2		%
Consolidated:
Gross premiums written	$	1,617,936		$	1,430,920
Net premiums written	1,341,898			1,190,991
Net premiums earned	1,282,515			1,147,357
Loss ratio	62.8		%	63.7		%
Expense ratio	33.8		%	34.5		%
GAAP combined ratio	96.6		%	98.2		%

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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 June 30, 2013 and 2012:

(In thousands, except per share data)	2013		2012
Net income to common stockholders	$	115,957	$	108,838
Weighted average diluted shares	141,274		143,528
Net income per diluted share	$	0.82	$	0.76

The Company reported net income of $116 million in 2013 compared to $109 million in 2012. The increase in net income was primarily due to increases in after-tax underwriting income of $15 million, partially offset by a decrease in after-tax net investment income of $12 million. The number of weighted average diluted shares decreased as a result of the Company’s repurchases of its common stock in 2012 and 2013.

Premiums. Gross premiums written were $1,618 million in 2013, an increase of 13% from $1,431 million in 2012. The growth was due to a combination of rate increases and increased exposures, including expansion into new geographic and product markets. Approximately 74.9% of policies expiring in 2013 were renewed, compared with a 76.7% renewal retention rate for policies expiring in 2012. The average rate (i.e., average premium adjusted for change in exposures) for policies that renewed in 2013 increased 6.5%. Audit premiums were $22 million in 2013 compared with $24 million in 2012.

From 2005 through 2010, the property casualty insurance market was highly competitive and insurance rates decreased across most business lines. Prices began to increase in 2011, and the rate of increase accelerated in 2012. Cumulatively, our average rates have increased 18% since 2010. However, overall loss costs are also generally increasing, and current market price levels for certain lines of business remain below the prices required for the Company to achieve its long-term return objectives. A summary of gross premiums written in 2013 compared with 2012 by line of business within each business segment follows:

• Insurance-Domestic gross premiums increased 13% to $1,186 million in 2013 from $1,051 million in 2012. Gross premiums increased $85 million (27%) for other liability, $16 million (15%) for commercial automobile, $14 million (5%) for short-tail lines, $12 million (14%) for professional liability and $8 million (3%) for workers' compensation.

• Insurance-International gross premiums increased 11% to $242 million in 2013 from $217 million in 2012. Gross premiums increased $22 million (20%) for short-tail lines, $3 million (10%) for professional liability and $2 million (9%) for workers' compensation and decreased $2 million (7%) for other liability.

• Reinsurance-Global gross premiums increased 17% to $190 million in 2013 from $163 million in 2012. Gross premiums increased $25 million (26%) for casualty business and $2 million (3%) for property business.

Net premiums written were $1,342 million in 2013, an increase of 13% from $1,191 million in 2012. Ceded reinsurance premiums as a percentage of gross written premiums were 17% in 2013 and 2012.

Premiums earned increased 12% to $1,283 million in 2013 from $1,147 million in 2012. Insurance premiums (including the impact of rate changes) are generally earned evenly over the policy term, and accordingly we expect to recognize recent rate increases over the upcoming quarters. Premiums earned in 2013 are related to business written during both 2013 and 2012.

Net Investment Income. Following is a summary of net investment income for the three months ended June 30, 2013 and 2012:

($ in thousands)	Amount						Average Annualized Yield
	2013			2012			2013		2012
Fixed maturity securities, including cash and cash equivalents and loans receivable	$	111,203		$	119,835		3.6	%	3.8	%
Arbitrage trading account	4,990			60			3.5		0.1
Investment funds	22,576			35,619			11.2		21.8
Equity securities available for sale	3,634			3,829			4.4		3.7
Real estate	3,116			3,348			2.1		3.7
Gross investment income	145,519			162,691			4.0	%	4.5	%
Investment expenses	(1,782		)	(1,441		)
Total	$	143,737		$	161,250		3.9	%	4.4	%

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Net investment income decreased 11% to $144 million in 2013 from $161 million in 2012. The decrease in investment income was primarily due to a decrease in income from energy funds (investment funds are reported on a one quarter lag) and to lower interest income on fixed income securities. The average annualized yield for fixed maturity securities declined from 3.8% to 3.6% due to lower long-term reinvestment yields available in the market. We expect investment income on our fixed maturity portfolio to decline if interest rates remain at their current low levels. Average invested assets, at cost (including cash and cash equivalents) were $14.7 billion in 2013 and $14.5 billion in 2012.

Insurance Service Fees. The Company is a servicing carrier of workers' compensation assigned risk plans for 20 states and provides insurance program management services to self-insureds, captives, governmental entities, risk retention groups, and insurance companies. Service fees were $28 million in 2013 and $27 million in 2012.

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 $33 million in 2013 compared with $24 million in 2012.

Change in Valuation Allowance, Net of Other-Than-Temporary Impairments. 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. The cost of securities is adjusted where appropriate to include a provision for a decline in value that is considered to be other-than-temporary. There were no other-than-temporary impairments in 2013 or 2012.

Revenues from Wholly-Owned Investees. Revenues from wholly-owned investees were derived from aviation-related businesses that provide services to the general aviation market, including fuel and line service, aircraft sales and maintenance, avionics and engineering services and parts fabrication. Revenues from wholly-owned investees increased to $84 million in 2013 from $55 million in 2012, primarily as a result of the acquisition of an aircraft equipment supplier in January 2013.

Losses and Loss Expenses. Losses and loss expenses increased to $805 million in 2013 from $731 million in 2012. The consolidated loss ratio was 62.8% in 2013, down from 63.7% in 2012. Catastrophe losses, net of reinsurance recoveries and reinstatement premiums, were $34 million in 2013 compared with $27 million in 2012. Favorable prior year reserve development was $18 million in 2013 compared with $30 million in 2012, a difference of 1.1 loss ratio points. The loss ratio excluding catastrophe losses and prior year reserve development decreased 2.4 points to 61.6% in 2013 from 64.0% in 2012 due to favorable pricing and loss cost trends. A summary of loss ratios in 2013 compared with 2012 by business segment follows:

• Insurance-Domestic - The loss ratio of 62.9% in 2013 was 2.2 points lower than the loss ratio of 65.1% in 2012. Catastrophe losses were $26 million in both 2013 and 2012. Favorable prior year reserve development was $24 million in 2013 compared with $21 million in 2012. The loss ratio excluding catastrophe losses and prior year reserve development decreased 2.0 points to 62.5% in 2013 from 64.5% in 2012.

• Insurance-International - The loss ratio of 61.0% in 2013 was 2.7 points higher than the loss ratio of 58.3% in 2012. Prior year reserves increased $6 million in 2013 compared with none in 2012. The loss ratio excluding catastrophe losses and prior year reserve development decreased 1.9 points to 56.4% in 2013 from 58.3% in 2012.

• Reinsurance-Global - The loss ratio of 63.9% in 2013 was 2.3 points higher than the loss ratio of 61.6% in 2012. There were $5 million in catastrophe losses in 2013 compared with $1 million in 2012, an increase of 2.1 loss ratio points. Prior year reserves were unchanged in 2013 compared with favorable reserve development of $9 million in 2012, a difference of 5.9 loss ratio points. The loss ratio excluding catastrophe losses and prior year reserve development decreased 5.7 points to 61.6% in 2013 from 67.3% in 2012 due to lower property losses.

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

(In thousands)	2013			2012
Underwriting expenses	$	433,271		$	395,920
Service expenses	23,136			21,635
Debt extinguishment costs	6,709			—
Net foreign currency losses (gains)	(6,718		)	137
Other costs and expenses	37,888			31,066
Total	$	494,286		$	448,758

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Underwriting expenses are comprised of commissions paid to agents and brokers, premium taxes and other assessments and internal underwriting costs. Underwriting expenses increased 9% compared with an increase in net premiums earned of 12%. The expense ratio (underwriting expenses expressed as a percentage of premiums earned) was 33.8% in 2013 and 34.5% in 2012, reflecting the increase in earned premiums. We expect our expense ratio to further improve over time if insurance prices continue to increase at current levels.

Service expenses, which represent the costs associated with the fee-based businesses, increased 7% to $23 million. The increase was due to an increase in general and administrative expenses related to fee-based business.

Debt extinguishment costs of $7 million in 2013 (compared to none in 2012) are unamortized debt issuance costs related to $250 million of 6.750% Subordinated Debentures that were due in 2045 and were prepaid in May 2013.

Net foreign currency gains of $7 million in 2013 (compared to $0.1 million in 2012) resulted from transactions denominated in a currency other than the operating unit’s functional currency.

Other costs and expenses were $38 million in 2013 compared with $31 million in 2012. 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.

Expenses from Wholly-Owned Investees. Expenses from wholly-owned investees represent costs associated with aviation-related businesses that include cost of goods sold related to aircraft and other sales, labor and equipment costs related to repairs and other services and general and administrative expenses. Expenses from wholly-owned investees increased to $81 million in 2013 from $55 million in 2012 primarily due to an acquisition in January 2013.

Interest Expense. Interest expense was $31 million in 2013 compared with $32 million in 2012. The Company issued $350 million of 4.625% senior notes in March 2012 and repaid $200 million of 5.875% senior notes that matured in February 2013. In May 2013, the Company issued $350 million of 5.625% Subordinated Debentures due 2053 and prepaid $250 million of 6.750% Subordinated Debentures that were due in 2045.

Income Taxes. The effective income tax rate was 27% in 2013 and in 2012. The effective income tax rate differs from the federal income tax rate of 35% primarily because of tax-exempt investment income.

38

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.

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 was 3.3 years at June 30, 2013 and 3.4 years at December 31, 2012. The Company’s fixed maturity investment portfolio and investment-related assets as of June 30, 2013 were as follows:

($ in thousands)	Carrying Value		Percent of Total
Fixed maturity securities:
U.S. government and government agencies	$	844,102	5.8	%
State and municipal:
Special revenue	1,987,799		13.7	%
Pre-refunded (1)	670,987		4.6	%
State general obligation	801,134		5.5	%
Local general obligation	359,835		2.5	%
Corporate backed	394,589		2.7	%
Total state and municipal	4,214,344		28.9	%
Mortgage-backed securities:
Agency	1,096,535		7.5	%
Residential-Prime	219,235		1.5	%
Residential-Alt A	92,591		0.6	%
Commercial	181,053		1.2	%
Total mortgage-backed securities	1,589,414		10.9	%
Corporate:
Industrial	1,540,555		10.6	%
Financial	929,279		6.4	%
Asset-backed	1,049,126		7.2	%
Utilities	229,827		1.6	%
Other	117,072		0.8	%
Total corporate	3,865,859		26.6	%
Foreign government and foreign government agencies	1,121,459		7.7	%
Total fixed maturity securities	11,635,178		79.9	%
Equity securities
Common stocks	330,636		2.3	%
Preferred stocks	104,205		0.7	%
Total equity securities	434,841		3.0	%
Investment funds	858,394		5.9	%
Real estate	589,936		4.1	%
Arbitrage trading account	680,713		4.7	%
Loans receivable	359,177		2.5	%
Total investments	$	14,558,239	100.0	%

______________    

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

39

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 June 30, 2013, investments in foreign fixed maturity securities were as follows:

$ in thousands)	Government		Corporate		Total
Australia	$	231,716	$	119,102	$	350,818
Canada	133,684		52,800		186,484
United Kingdom	116,187		56,605		172,792
Argentina	117,520		39,981		157,501
Germany	74,471		—		74,471
Norway	61,123				61,123
Brazil	46,726		—		46,726
Supranational (1)	37,652		—		37,652
Netherlands	—		12,965		12,965
Switzerland	—		10,721		10,721
Singapore	6,805		—		6,805
Uruguay	3,401		—		3,401
Total	$	829,285	$	292,174	$	1,121,459

_______________

(1) Supranational represents investments in the North American Development Bank, European Investment Bank and Inter- American Development Bank.

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

Investment Funds. At June 30, 2013, the carrying value of investment funds was $858 million, including investments in real estate funds of $382 million and investments in energy funds of $147 million.

Real Estate. Real estate is directly owned property held for investment. At June 30, 2013, the primary real estate properties are an office building in operation, three office buildings under development and a long-term ground lease.

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, have an aggregate cost of $359 million and an aggregate fair value of $364 million at June 30, 2013. Amortized cost of these loans is net of a valuation allowance of $2 million as of June 30, 2013. The six largest loans have an aggregate amortized cost of $244 million and an aggregate fair value of $247 million as of such date and are secured by commercial real estate. These loans earn interest at floating LIBOR-based interest rates and have maturities (inclusive of extension options) through August 2025. The loans are secured by commercial real estate located primarily in New York City, California, Hawaii and Chicago.

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

40

attempts to manage its interest rate risk by maintaining 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 for the fixed maturity portfolio was 3.3 years at June 30, 2013 and 3.4 years at December 31, 2012. 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 $314 million in the first six months of 2013 from $312 million in the comparable period in 2012 as an increase in cash flow from underwriting activities was mostly offset by higher tax payments. The increase in cash flow from underwriting activities primarily reflects a reduction in the paid loss ratio (paid losses as a percent of earned premiums) to 55% in the first six months of 2013 from 58% in the comparable period in 2012.

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 81% invested in cash, cash equivalents and marketable fixed maturity securities as of June 30, 2013. 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 June 30, 2013, the Company had senior notes, junior subordinated debentures and other debt outstanding with a carrying value of $2,036 million and a face amount of $2,058 million. The maturities of the outstanding debt are $6 million in 2013, $32 million in 2014, $238 million in 2015, $4 million in 2016, $450 million in 2019, $300 million in 2020, $427 million in 2022, $1 million in 2023, $250 million in 2037 and $350 million in 2053.

The Company issued $350 million of 4.625% senior notes in March 2012 and repaid $200 million of 5.875% senior notes that matured in February 2013. In May 2013, the Company issued $350 million of 5.625% Subordinated Debentures due 2053 and prepaid $250 million of 6.750% Subordinated Debentures that were due in 2045.

Equity. At June 30, 2013, total common stockholders’ equity was $4.2 billion, common shares outstanding were approximately 135 million and stockholders’ equity per outstanding share was $31.33.

Total Capital.Total capitalization (equity, debt and junior subordinated debentures) was $6.3 billion at June 30, 2013. The percentage of the Company’s capital attributable to debt and junior subordinated debentures was 32% at June 30, 2013 and 33% at December 31, 2012.

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 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 June 30, 2013, 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

41

Item 1.Legal Proceedings

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

Item 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, 2012.

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 June 30, 2013 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
April 2013	—	$	—	—	9,068,093
May 2013	178,864	40.80		178,864	8,889,229
June 2013	597,373	$	40.28	597,373	8,291,856

Item 6.Exhibits

Number
(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.

42

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:	August 6, 2013	/s/ William R. Berkley
		William R. Berkley
		Chairman of the Board and Chief Executive Officer
Date:	August 6, 2013	/s/ Eugene G. Ballard
		Eugene G. Ballard
		Senior Vice President - Chief Financial Officer

43

EX-31.1

Exhibit 31.1

CERTIFICATIONS

I, William R. Berkley, Chairman of the Board 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: August 6, 2013

/s/ William R. Berkley  

William R. Berkley 

Chairman of the Board and

Chief Executive Officer 

EX-31.2

Exhibit 31.2

CERTIFICATIONS

I, Eugene G. Ballard, Senior 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: August 6, 2013

/s/ Eugene G. Ballard

Eugene G. Ballard

Senior 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 June 30, 2013 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), we, William R. Berkley, Chairman of the Board and Chief Executive Officer of the Company, and Eugene G. Ballard, Senior 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/ William R. Berkley

William R. Berkley

Chairman of the Board and Chief Executive Officer

/s/ Eugene G. Ballard

Eugene G. Ballard

Senior Vice President — Chief Financial Officer

August 6, 2013

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.

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Net Investment Income

6 Months Ended

Jun. 30, 2013

Net Investment Income [Abstract]

Net Investment Income

Net Investment Income

Net investment income consists of the following:

	For the Three Months Ended						For the Six Months Ended
	June 30,						June 30,
(In thousands)	2013			2012			2013			2012
Investment income earned on:
Fixed maturity securities, including cash and cash equivalents and loans receivable	$	111,203		$	119,835		$	229,039		$	239,123
Investment funds	22,576			35,619			33,510			63,242
Arbitrage trading account	4,990			60			8,773			6,541
Equity securities available for sale	3,634			3,829			5,881			6,979
Real estate	3,116			3,348			6,257			5,524
Gross investment income	145,519			162,691			283,460			321,409
Investment expense	(1,782		)	(1,441		)	(3,794		)	(2,540		)
Net investment income	$	143,737		$	161,250		$	279,666		$	318,869

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Arbitrage Trading Account (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Trading Securities [Abstract]
Arbitrage trading account	$ 680,713	$ 329,077

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Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
REVENUES:
Net premiums written	$ 1,341,898	$ 1,190,991	$ 2,718,864	$ 2,394,517
Change in net unearned premiums	(59,383)	(43,634)	(204,230)	(147,509)
Net premiums earned	1,282,515	1,147,357	2,514,634	2,247,008
Net investment income	143,737	161,250	279,666	318,869
Insurance service fees	27,652	27,036	54,388	50,913
Net investment gains	33,058	24,286	53,027	67,763
Change in valuation allowance, net of other-than-temporary impairments	0	0	0	4,014
Revenues from wholly-owned investees	83,775	55,434	175,510	105,109
Other income	225	384	506	776
Total revenues	1,570,962	1,415,747	3,077,731	2,794,452
OPERATING COSTS AND EXPENSES:
Losses and loss expenses	805,470	731,202	1,550,149	1,410,674
Other operating costs and expenses	494,286	448,758	975,890	880,537
Expenses from wholly-owned investees	81,293	54,931	170,445	106,261
Interest expense	31,207	32,417	62,318	61,238
Total operating costs and expenses	1,412,256	1,267,308	2,758,802	2,458,710
Income before income taxes	158,706	148,439	318,929	335,742
Income tax expense	(43,579)	(39,535)	(87,204)	(91,606)
Net income before noncontrolling interests	115,127	108,904	231,725	244,136
Noncontrolling interests	830	(66)	847	20
Net income to common stockholders	$ 115,957	$ 108,838	$ 232,572	$ 244,156
NET INCOME PER SHARE:
Basic	$ 0.85	$ 0.79	$ 1.71	$ 1.77
Diluted	$ 0.82	$ 0.76	$ 1.65	$ 1.7

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Recent Accounting Pronouncements

6 Months Ended

Jun. 30, 2013

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

Recent Accounting Pronouncements

Recent Accounting Pronouncements

In February 2013, the Financial Accounting Standards Board issued ASU 2013-02 relating to disclosures about items reclassified out of accumulated other comprehensive income ("AOCI"). The Company’s adoption of the updated guidance effective January 1, 2013 resulted in a change in the disclosures for AOCI in the Company’s consolidated financial statements but did not have any impact on the Company’s results of operations, financial position or liquidity.

All 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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Reinsurance

6 Months Ended

Jun. 30, 2013

Reinsurance Disclosures [Abstract]

Reinsurance

Reinsurance

The following is a summary of reinsurance financial information:

	For the Three Months Ended						For the Six Months Ended
	June 30,						June 30,
(In thousands)	2013			2012			2013			2012
Written premiums:
Direct	$	1,405,183		$	1,249,576		$	2,805,595		$	2,450,595
Assumed	212,753			181,344			443,962			381,851
Ceded	(276,038		)	(239,929		)	(530,693		)	(437,929		)
Total net premiums written	$	1,341,898		$	1,190,991		$	2,718,864		$	2,394,517
Earned premiums:
Direct	$	1,301,702		$	1,163,162		$	2,542,264		$	2,267,118
Assumed	217,517			186,762			431,533			366,280
Ceded	(236,704		)	(202,567		)	(459,163		)	(386,390		)
Total net premiums earned	$	1,282,515		$	1,147,357		$	2,514,634		$	2,247,008
Ceded losses incurred	$	142,360		$	109,142		$	252,911		$	194,419

The Company reinsures a portion of its exposures principally to reduce its net liability on individual risks and to protect against catastrophic 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 $2 million as of June 30, 2013 and December 31, 2012.

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Fair Value of Financial Instruments (Carrying Amounts and Estimated Fair Values of Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Assets:
Arbitrage trading account	$ 680,713	$ 329,077
Carrying Value
Assets:
Fixed maturity securities	11,635,178	11,943,956
Equity securities available for sale	434,841	376,022
Arbitrage trading account	680,713	329,077
Loans receivable	359,177	401,961
Cash and cash equivalents	658,839	905,670
Trading account receivables from brokers and clearing organizations	144,150	446,873
Due from broker	8,901	14,449
Liabilities:
Trading account securities sold but not yet purchased	171,990	121,487
Junior subordinated debentures	339,614	243,206
Senior notes and other debt	1,695,986	1,871,535
Fair Value
Assets:
Fixed maturity securities	11,652,382	11,968,376
Equity securities available for sale	434,841	376,022
Arbitrage trading account	680,713	329,077
Loans receivable	363,942	406,443
Cash and cash equivalents	658,839	905,670
Trading account receivables from brokers and clearing organizations	144,150	446,873
Due from broker	8,901	14,449
Liabilities:
Trading account securities sold but not yet purchased	171,990	121,487
Junior subordinated debentures	327,040	252,000
Senior notes and other debt	$ 1,889,098	$ 2,190,173

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Real Estate Real Estate (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Real Estate [Abstract]
Properties in operation	$ 265,884	$ 282,899
Properties under development	324,052	323,836
Total	$ 589,936	$ 606,735

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Investment Funds

6 Months Ended

Jun. 30, 2013

Equity Method Investments and Joint Ventures [Abstract]

Investment Funds [Text Block]

Investment Funds

Investment funds consist of the following:

	Carrying Value as of				Income (Losses) from Investment Funds
	June 30,		December 31,		For the Six Months Ended June 30,
(In thousands)	2013		2012		2013		2012
Real estate	$	381,855	$	373,259	$	1,260	$	11,290
Energy	146,966		146,325		25,199		49,780
Arbitrage	65,651		63,920		1,731		(662		)
Other	263,922		226,185		5,320		2,834
Total	$	858,394	$	809,689	$	33,510	$	63,242

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.

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Statements of Cash Flow (Details) (USD $)	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Supplemental Cash Flow Information [Abstract]
Interest payments	$ 65,365,000	$ 55,616,000
Income taxes paid	$ 137,618,000	$ 68,118,000

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Real Estate Real Estate (Details 1) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Real Estate [Abstract]
Accumulated depreciation and amortization on properties	$ 13,027		$ 10,354
Real estate depreciation expense	3,420	3,781
Lease future minimum payments 2013	737
Lease future minimum payments 2014	1,504
Lease future minimum payments 2015	1,549
Lease future minimum payments 2016	1,596
Lease future minimum payments 2017	1,644
Lease future minimum payments after 2017	$ 329,013

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Securities In An Unrealized Loss Position (Tables)

6 Months Ended

Jun. 30, 2013

Investments, Debt and Equity Securities [Abstract]

Securities In An Unrealized Loss Position

The following table summarizes all securities in an unrealized loss position at June 30, 2013 and December 31, 2012 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
June 30, 2013
U.S. government and agency	$	109,891	$	2,131	$	—	$	—	$	109,891	$	2,131
State and municipal	528,045		14,077		67,266		3,185		595,311		17,262
Mortgage-backed securities	612,369		16,308		54,843		3,764		667,212		20,072
Corporate	1,166,097		13,102		67,142		9,911		1,233,239		23,013
Foreign	249,199		6,853		—		—		249,199		6,853
Fixed maturity securities	2,665,601		52,471		189,251		16,860		2,854,852		69,331
Common stocks	77,610		5,360		—		—		77,610		5,360
Preferred stocks	17,702		346		21,636		4,038		39,338		4,384
Equity securities	95,312		5,706		21,636		4,038		116,948		9,744
Total	$	2,760,913	$	58,177	$	210,887	$	20,898	$	2,971,800	$	79,075
December 31, 2012
U.S. government and agency	$	69,551	$	1,660	$	—	$	—	$	69,551	$	1,660
State and municipal	152,694		1,639		135,967		8,054		288,661		9,693
Mortgage-backed securities	484,731		3,629		58,292		4,571		543,023		8,200
Corporate	371,781		2,964		70,537		9,119		442,318		12,083
Foreign	95,623		996		11,210		28		106,833		1,024
Fixed maturity securities	1,174,380		10,888		276,006		21,772		1,450,386		32,660
Common stocks	46,725		707		—		—		46,725		707
Preferred stocks	—		—		39,812		1,651		39,812		1,651
Equity securities	46,725		707		39,812		1,651		86,537		2,358
Total	$	1,221,105	$	11,595	$	315,818	$	23,423	$	1,536,923	$	35,018

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 June 30, 2013 is presented in the table below.

($ in thousands)	Number of Securities	Aggregate Fair Value		Gross Unrealized Loss
Mortgage-backed securities	18	$	106,405	$	5,246
Corporate	9	26,685		4,067
State and municipal	2	18,361		47
Foreign	2	19,337		240
Total	31	$	170,788	$	9,600

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Industry Segments

6 Months Ended

Jun. 30, 2013

Segment Reporting [Abstract]

Industry Segments

Business Segments

The Company’s financial results are presented for the following reportable business segments:

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

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

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

During the first quarter of 2013, the Company changed the aggregation of its business segments. All domestic insurance operating companies, previously included in the Specialty, Regional and Alternative Markets segments, were aggregated into the Insurance-Domestic segment; all reinsurance operating companies were aggregated into the Reinsurance-Global segment; and all international insurance companies were aggregated into the Insurance-International 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, 2012, 2011 and 2010, and as of December 31, 2012 and 2011, 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 business segments is presented in the following tables.

	Revenues
(In thousands)	Earned Premiums		Investment Income			Other		Total		Pre-Tax Income (Loss)			Net Income (Loss)
Three months ended June 30, 2013:
Insurance-Domestic	$	925,997	$	107,562		$	27,652	$	1,061,211	$	152,334		$	106,478
Insurance-International	180,192		13,171			—		193,363		12,583			9,092
Reinsurance-Global	176,326		23,036			—		199,362		24,752			17,681
Corporate and eliminations (1)	—		(32		)	84,000		83,968		(64,021		)	(38,782		)
Net investment gains	—		—			33,058		33,058		33,058			21,488
Total	$	1,282,515	$	143,737		$	144,710	$	1,570,962	$	158,706		$	115,957
Three months ended June 30, 2012:
Insurance-Domestic	$	846,734	$	120,656		$	27,036	$	994,426	$	144,640		$	103,435
Insurance-International	154,501		11,194			—		165,695		13,782			9,833
Reinsurance-Global	146,122		28,451			—		174,573		27,454			20,055
Corporate and eliminations (1)	—		949			55,818		56,767		(61,723		)	(40,335		)
Net investment gains	—		—			24,286		24,286		24,286			15,850
Total	$	1,147,357	$	161,250		$	107,140	$	1,415,747	$	148,439		$	108,838
Six months ended June 30, 2013:
Insurance-Domestic	$	1,810,375	$	205,359		$	54,388	$	2,070,122	$	293,684		$	205,886
Insurance-International	351,311		25,232			—		376,543		34,965			24,569
Reinsurance-Global	352,948		45,535			—		398,483		62,693			44,075
Corporate and eliminations (1)	—		3,540			176,016		179,556		(125,440		)	(76,426		)
Net investment gains	—		—			53,027		53,027		53,027			34,468
Total	$	2,514,634	$	279,666		$	283,431	$	3,077,731	$	318,929		$	232,572
Six months ended June 30, 2012:
Insurance-Domestic	$	1,656,803	$	232,742		$	50,913	$	1,940,458	$	292,375		$	209,315
Insurance-International	298,386		21,525			—		319,911		29,481			20,945
Reinsurance-Global	291,819		57,138			—		348,957		59,092			43,141
Corporate and eliminations (1)	—		7,464			105,885		113,349		(116,983		)	(76,177		)
Net investment gains	—		—			71,777		71,777		71,777			46,932
Total	$	2,247,008	$	318,869		$	228,575	$	2,794,452	$	335,742		$	244,156

___________

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

Identifiable assets by segment are as follows:

(In thousands)	June 30, 2013		December 31, 2012
Insurance-Domestic	$	14,849,126	$	14,661,476
Insurance-International	1,449,188		1,541,365
Reinsurance-Global	2,965,565		3,337,937
Corporate and eliminations	947,663		615,118
Total	$	20,211,542	$	20,155,896

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

	For the Three Months Ended				For the Six Months Ended
	June 30,				June 30,
(In thousands)	2013		2012		2013		2012
Insurance-Domestic
Other liability	$	307,444	$	257,781	$	603,032	$	531,345
Workers’ compensation	241,191		224,562		470,202		414,106
Short-tail lines (1)	192,938		189,390		371,687		363,292
Commercial automobile	119,900		112,532		236,022		222,899
Products liability	64,524		62,469		129,432		125,161
Total	925,997		846,734		1,810,375		1,656,803
Insurance-International
Other liability	15,070		17,745		30,288		33,279
Workers’ compensation	21,746		19,898		44,635		38,516
Short-tail lines (1)	84,301		63,831		156,424		116,309
Commercial automobile	32,392		29,606		67,031		60,274
Products liability	26,683		23,421		52,933		50,008
Total	180,192		154,501		351,311		298,386
Reinsurance-Global
Casualty	122,117		103,274		243,444		208,363
Property	54,209		42,848		109,504		83,456
Total	176,326		146,122		352,948		291,819
Total	$	1,282,515	$	1,147,357	$	2,514,634	$	2,247,008

_____________________

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

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Restricted Stock Units

6 Months Ended

Jun. 30, 2013

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 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 $11 million and $15 million for the six months ended June 30, 2013 and 2012, respectively. Grants of RSUs are made periodically, generally every other year. A summary of RSUs issued in the six months ended June 30,2013 and 2012 follows:

($ in thousands)	Units	Fair Value
Six months ended June 30:
2013	55,150	$	2,312
2012	99,050	$	3,633

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Acquistions (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Business Acquisition [Line Items]
Goodwill	$ 112,741	$ 87,865
After Market Original Equipment Manufacturer
Business Acquisition [Line Items]
Cash and cash equivalents	3,911
Real estate, furniture and equipment	898
Goodwill	19,664
Intangible assets	44,800
Other assets	60,661
Total assets acquired	129,934
Debt	(27,612)
Other liabilities assumed	(17,076)
Net assets acquired	$ 85,246

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Investment Funds Investment Funds (Tables)

6 Months Ended

Jun. 30, 2013

Equity Method Investments and Joint Ventures [Abstract]

Schedule of Investment Funds

Investment funds consist of the following:

	Carrying Value as of				Income (Losses) from Investment Funds
	June 30,		December 31,		For the Six Months Ended June 30,
(In thousands)	2013		2012		2013		2012
Real estate	$	381,855	$	373,259	$	1,260	$	11,290
Energy	146,966		146,325		25,199		49,780
Arbitrage	65,651		63,920		1,731		(662		)
Other	263,922		226,185		5,320		2,834
Total	$	858,394	$	809,689	$	33,510	$	63,242

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Reinsurance (Tables)

6 Months Ended

Jun. 30, 2013

Reinsurance Disclosures [Abstract]

Reinsurance Financial Information

The following is a summary of reinsurance financial information:

	For the Three Months Ended						For the Six Months Ended
	June 30,						June 30,
(In thousands)	2013			2012			2013			2012
Written premiums:
Direct	$	1,405,183		$	1,249,576		$	2,805,595		$	2,450,595
Assumed	212,753			181,344			443,962			381,851
Ceded	(276,038		)	(239,929		)	(530,693		)	(437,929		)
Total net premiums written	$	1,341,898		$	1,190,991		$	2,718,864		$	2,394,517
Earned premiums:
Direct	$	1,301,702		$	1,163,162		$	2,542,264		$	2,267,118
Assumed	217,517			186,762			431,533			366,280
Ceded	(236,704		)	(202,567		)	(459,163		)	(386,390		)
Total net premiums earned	$	1,282,515		$	1,147,357		$	2,514,634		$	2,247,008
Ceded losses incurred	$	142,360		$	109,142		$	252,911		$	194,419

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Statements of Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012	Jun. 30, 2013		Jun. 30, 2012
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Beginning of Period				$ 465,631
Other comprehensive income (loss)	(218,402)		23,101	(255,401)		61,532
Accumulated Other Comprehensive Income (Loss), End of Period	210,225			210,225
Net investment gains	33,058		24,286	53,027		67,763
Income before income taxes	158,706		148,439	318,929		335,742
Income before taxes	494,286		448,758	975,890		880,537
Tax effect	43,579		39,535	87,204		91,606
After-tax amounts reclassified	115,127		108,904	231,725		244,136
Unrealized investment gains, pre-tax	(303,169)			(291,154)
Unrealized investment gains, tax effect	106,109			101,904
Unrealized investment gains, after-tax amounts	(197,060)			(189,250)
Currency translation adjustment, pre-tax	(23,156)			(69,779)
Currency translation adjustment, tax effect	0			0
Change in unrealized translation adjustments	(23,156)		(17,257)	(69,779)		(1,674)
Net pension asset, pre-tax	2,790			5,582
Net pension asset, tax effect	(976)			(1,954)
Met pension asset, after-tax amounts	1,814			3,628
Other comprehensive income (loss), pre-tax	(323,535)			(355,351)
Other comprehensive income (loss), tax effect	105,133			99,950
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	525,428			517,658
Other comprehensive income (loss) before reclassifications	(182,934)			(161,945)
Amounts reclassified from AOCI	(14,126)			(27,305)
Other comprehensive income (loss)	(197,060)			(189,250)
Unrealized investment gain related to non-controlling interest	35			(5)
Accumulated Other Comprehensive Income (Loss), End of Period	328,403			328,403
Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Beginning of Period	(83,299)			(36,676)
Other comprehensive income (loss) before reclassifications	(23,156)			(69,779)
Amounts reclassified from AOCI	0			0
Other comprehensive income (loss)	(23,156)			(69,779)
Accumulated Other Comprehensive Income (Loss), End of Period	(106,455)			(106,455)
Change in unrealized translation adjustments				(69,779)		(1,674)
Net Pension Asset [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Beginning of Period	(13,537)			(15,351)
Other comprehensive income (loss) before reclassifications	0			0
Amounts reclassified from AOCI	1,814			3,628
Other comprehensive income (loss)	1,814			3,628
Accumulated Other Comprehensive Income (Loss), End of Period	(11,723)			(11,723)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Beginning of Period	428,592			465,631
Other comprehensive income (loss) before reclassifications	(206,090)			(231,724)
Amounts reclassified from AOCI	(12,312)			(23,677)
Other comprehensive income (loss)	(218,402)			(255,401)
Unrealized investment gain related to non-controlling interest	35			(5)
Accumulated Other Comprehensive Income (Loss), End of Period	210,225			210,225
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 investment gains	(21,933)	[1]		(42,008)	[1]
Tax effect	7,807	[2]		14,703	[2]
After-tax amounts reclassified	(14,126)			(27,305)
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	0			0
After-tax amounts reclassified	0			0
Reclassification out of Accumulated Other Comprehensive Income [Member] | Net Pension Asset [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Income before taxes	2,790	[3]		5,582	[3]
Tax effect	(976)	[2]		(1,954)	[2]
After-tax amounts reclassified	1,814			3,628
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	(19,143)			(36,426)
Tax effect	6,831			12,749
After-tax amounts reclassified	$ (12,312)			$ (23,677)

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

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

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

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Investments In Fixed Maturity Securities (Tables)

6 Months Ended

Jun. 30, 2013

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 June 30, 2013, 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	$	900,989	$	925,233
Due after one year through five years	3,555,283		3,697,764
Due after five years through ten years	2,686,863		2,853,103
Due after ten years	2,490,039		2,582,858
Mortgage-backed securities	1,568,860		1,593,424
Total	$	11,202,034	$	11,652,382

Debt Securities [Member]

Schedule of Marketable Securities [Line Items]

Schedule of investments in fixed maturity securities

At June 30, 2013 and December 31, 2012, investments in fixed maturity securities were as follows:

(In thousands)	Amortized Cost		Gross Unrealized					Fair Value		Carrying Value
			Gains		Losses
June 30, 2013
Held to maturity:
State and municipal	$	67,092	$	12,680	$	—		$	79,772	$	67,092
Residential mortgage-backed	29,661		4,010		—			33,671		29,661
Corporate	4,997		514		—			5,511		4,997
Total held to maturity	101,750		17,204		—			118,954		101,750
Available for sale:
U.S. government and government agency	799,530		46,703		(2,131		)	844,102		844,102
State and municipal	3,961,116		203,398		(17,262		)	4,147,252		4,147,252
Mortgage-backed securities:
Residential (1)	1,361,874		35,711		(18,885		)	1,378,700		1,378,700
Commercial	177,325		4,915		(1,187		)	181,053		181,053
Corporate	3,749,727		134,148		(23,013		)	3,860,862		3,860,862
Foreign	1,050,712		77,600		(6,853		)	1,121,459		1,121,459
Total available for sale	11,100,284		502,475		(69,331		)	11,533,428		11,533,428
Total investments in fixed maturity securities	$	11,202,034	$	519,679	$	(69,331	)	$	11,652,382	$	11,635,178
December 31, 2012
Held to maturity:
State and municipal	$	65,190	$	18,529	$	—		$	83,719	$	65,190
Residential mortgage-backed	32,764		5,286		—			38,050		32,764
Corporate	4,997		605		—			5,602		4,997
Total held to maturity	102,951		24,420		—			127,371		102,951
Available for sale:
U.S. government and government agency	827,591		72,532		(1,660		)	898,463		898,463
State and municipal	4,449,238		328,974		(9,693		)	4,768,519		4,768,519
Mortgage-backed securities:
Residential (1)	1,395,739		53,846		(7,456		)	1,442,129		1,442,129
Commercial	268,671		5,641		(744		)	273,568		273,568
Corporate	3,144,480		214,322		(12,083		)	3,346,719		3,346,719
Foreign	1,029,284		83,347		(1,024		)	1,111,607		1,111,607
Total available for sale	11,115,003		758,662		(32,660		)	11,841,005		11,841,005
Total investments in fixed maturity securities	$	11,217,954	$	783,082	$	(32,660	)	$	11,968,376	$	11,943,956

___________

(1) Gross unrealized losses for residential mortgage-backed securities include $2,515,000 and $3,037,000 as of June 30, 2013 and December 31, 2012, respectively, related to the non-credit portion of other-than-temporary impairments (“OTTI”) recognized in other comprehensive income.

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Fair Value Measurements (Assets and Liabilities Measured At Fair Value, On a Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities	$ 11,533,428	$ 11,841,005
Equity securities	434,841	376,022
Arbitrage trading account	680,713	329,077
Level 1 | Fair Value, Measurements, Recurring [Member]
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities	0	0
Equity securities	329,398	280,658
Assets, fair value disclosure	509,239	514,261
Arbitrage trading account	179,841	233,603
Securities sold but not yet purchased	117,636	114,909
Level 1 | Fair Value, Measurements, Recurring [Member] | U.S. government and 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] | Corporate
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities	0	0
Level 1 | Fair Value, Measurements, Recurring [Member] | Foreign
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]
Equity securities	329,398	280,658
Level 1 | Fair Value, Measurements, Recurring [Member] | Preferred stocks
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Equity securities	0	0
Level 2 | Fair Value, Measurements, Recurring [Member]
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities	11,482,507	11,781,940
Equity securities	100,428	93,335
Assets, fair value disclosure	12,083,724	11,969,821
Arbitrage trading account	500,789	94,546
Securities sold but not yet purchased	54,354	6,558
Level 2 | Fair Value, Measurements, Recurring [Member] | U.S. government and agency
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities	844,102	898,463
Level 2 | Fair Value, Measurements, Recurring [Member] | State and municipal
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities	4,147,252	4,768,519
Level 2 | Fair Value, Measurements, Recurring [Member] | Mortgage-backed securities
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities	1,559,753	1,715,697
Level 2 | Fair Value, Measurements, Recurring [Member] | Corporate
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities	3,809,941	3,287,654
Level 2 | Fair Value, Measurements, Recurring [Member] | Foreign
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities	1,121,459	1,111,607
Level 2 | Fair Value, Measurements, Recurring [Member] | Common stocks
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Equity securities	0	0
Level 2 | Fair Value, Measurements, Recurring [Member] | Preferred stocks
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Equity securities	100,428	93,335
Level 3 | Fair Value, Measurements, Recurring [Member]
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities	50,921	59,065
Equity securities	5,015	2,029
Assets, fair value disclosure	56,019	62,022
Arbitrage trading account	83	928
Securities sold but not yet purchased	0	20
Level 3 | Fair Value, Measurements, Recurring [Member] | U.S. government and 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] | Corporate
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities	50,921	59,065
Level 3 | Fair Value, Measurements, Recurring [Member] | Foreign
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]
Equity securities	1,238	1,408
Level 3 | Fair Value, Measurements, Recurring [Member] | Preferred stocks
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Equity securities	3,777	621
Fair Value | Fair Value, Measurements, Recurring [Member]
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities	11,533,428	11,841,005
Equity securities	434,841	376,022
Assets, fair value disclosure	12,648,982	12,546,104
Arbitrage trading account	680,713	329,077
Securities sold but not yet purchased	171,990	121,487
Fair Value | Fair Value, Measurements, Recurring [Member] | U.S. government and agency
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities	844,102	898,463
Fair Value | Fair Value, Measurements, Recurring [Member] | State and municipal
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities	4,147,252	4,768,519
Fair Value | Fair Value, Measurements, Recurring [Member] | Mortgage-backed securities
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities	1,559,753	1,715,697
Fair Value | Fair Value, Measurements, Recurring [Member] | Corporate
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities	3,860,862	3,346,719
Fair Value | Fair Value, Measurements, Recurring [Member] | Foreign
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Fixed maturity securities	1,121,459	1,111,607
Fair Value | Fair Value, Measurements, Recurring [Member] | Common stocks
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Equity securities	330,636	282,066
Fair Value | Fair Value, Measurements, Recurring [Member] | Preferred stocks
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]
Equity securities	$ 104,205	$ 93,956

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Securities In An Unrealized Loss Position Securities In An Unrealized Loss Position (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Aggregate fair value of securities in a continuous unrealized loss position	$ 2,971,800	$ 1,536,923
Gross Unrealized Losses	79,075	35,018
Preferred stocks
Schedule of Available-for-sale Securities [Line Items]
Aggregate fair value of securities in a continuous unrealized loss position	39,338	39,812
Gross Unrealized Losses	4,384	1,651
Preferred stocks | Noninvestment Grade Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of securities	3
Aggregate fair value of securities in a continuous unrealized loss position	39,000
Gross Unrealized Losses	4,000
Common stocks
Schedule of Available-for-sale Securities [Line Items]
Aggregate fair value of securities in a continuous unrealized loss position	77,610	46,725
Gross Unrealized Losses	5,360	707
Common stocks | Noninvestment Grade Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of securities	6
Aggregate fair value of securities in a continuous unrealized loss position	78,000
Gross Unrealized Losses	$ 5,000

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Industry Segments (Tables)

6 Months Ended

Jun. 30, 2013

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)
Three months ended June 30, 2013:
Insurance-Domestic	$	925,997	$	107,562		$	27,652	$	1,061,211	$	152,334		$	106,478
Insurance-International	180,192		13,171			—		193,363		12,583			9,092
Reinsurance-Global	176,326		23,036			—		199,362		24,752			17,681
Corporate and eliminations (1)	—		(32		)	84,000		83,968		(64,021		)	(38,782		)
Net investment gains	—		—			33,058		33,058		33,058			21,488
Total	$	1,282,515	$	143,737		$	144,710	$	1,570,962	$	158,706		$	115,957
Three months ended June 30, 2012:
Insurance-Domestic	$	846,734	$	120,656		$	27,036	$	994,426	$	144,640		$	103,435
Insurance-International	154,501		11,194			—		165,695		13,782			9,833
Reinsurance-Global	146,122		28,451			—		174,573		27,454			20,055
Corporate and eliminations (1)	—		949			55,818		56,767		(61,723		)	(40,335		)
Net investment gains	—		—			24,286		24,286		24,286			15,850
Total	$	1,147,357	$	161,250		$	107,140	$	1,415,747	$	148,439		$	108,838
Six months ended June 30, 2013:
Insurance-Domestic	$	1,810,375	$	205,359		$	54,388	$	2,070,122	$	293,684		$	205,886
Insurance-International	351,311		25,232			—		376,543		34,965			24,569
Reinsurance-Global	352,948		45,535			—		398,483		62,693			44,075
Corporate and eliminations (1)	—		3,540			176,016		179,556		(125,440		)	(76,426		)
Net investment gains	—		—			53,027		53,027		53,027			34,468
Total	$	2,514,634	$	279,666		$	283,431	$	3,077,731	$	318,929		$	232,572
Six months ended June 30, 2012:
Insurance-Domestic	$	1,656,803	$	232,742		$	50,913	$	1,940,458	$	292,375		$	209,315
Insurance-International	298,386		21,525			—		319,911		29,481			20,945
Reinsurance-Global	291,819		57,138			—		348,957		59,092			43,141
Corporate and eliminations (1)	—		7,464			105,885		113,349		(116,983		)	(76,177		)
Net investment gains	—		—			71,777		71,777		71,777			46,932
Total	$	2,247,008	$	318,869		$	228,575	$	2,794,452	$	335,742		$	244,156

Identifiable Assets By Segment

___________

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

Identifiable assets by segment are as follows:

(In thousands)	June 30, 2013		December 31, 2012
Insurance-Domestic	$	14,849,126	$	14,661,476
Insurance-International	1,449,188		1,541,365
Reinsurance-Global	2,965,565		3,337,937
Corporate and eliminations	947,663		615,118
Total	$	20,211,542	$	20,155,896

Net Premiums Earned By Major Line Of Business

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

	For the Three Months Ended				For the Six Months Ended
	June 30,				June 30,
(In thousands)	2013		2012		2013		2012
Insurance-Domestic
Other liability	$	307,444	$	257,781	$	603,032	$	531,345
Workers’ compensation	241,191		224,562		470,202		414,106
Short-tail lines (1)	192,938		189,390		371,687		363,292
Commercial automobile	119,900		112,532		236,022		222,899
Products liability	64,524		62,469		129,432		125,161
Total	925,997		846,734		1,810,375		1,656,803
Insurance-International
Other liability	15,070		17,745		30,288		33,279
Workers’ compensation	21,746		19,898		44,635		38,516
Short-tail lines (1)	84,301		63,831		156,424		116,309
Commercial automobile	32,392		29,606		67,031		60,274
Products liability	26,683		23,421		52,933		50,008
Total	180,192		154,501		351,311		298,386
Reinsurance-Global
Casualty	122,117		103,274		243,444		208,363
Property	54,209		42,848		109,504		83,456
Total	176,326		146,122		352,948		291,819
Total	$	1,282,515	$	1,147,357	$	2,514,634	$	2,247,008

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Industry Segments (Financial Information of Company Operating Segments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Segment Reporting Information [Line Items]
Earned Premiums	$ 1,282,515		$ 1,147,357		$ 2,514,634		$ 2,247,008
Investment Income and Funds	143,737		161,250		279,666		318,869
Other Revenues	144,710		107,140		283,431		228,575
Total revenues	1,570,962		1,415,747		3,077,731		2,794,452
Pre-Tax Income (Loss)	158,706		148,439		318,929		335,742
Net Income (Loss)	115,957		108,838		232,572		244,156
Net investment gains, before tax	33,058		24,286		53,027		71,777
Net investment gains, net of tax	21,488		15,850		34,468		46,932
Intersegment Eliminations and Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Earned Premiums	0		0		0	[1]	0	[1]
Investment Income and Funds	(32)		949		3,540	[1]	7,464	[1]
Other Revenues	84,000		55,818		176,016	[1]	105,885	[1]
Total revenues	83,968	[1]	56,767	[1]	179,556	[1]	113,349	[1]
Pre-Tax Income (Loss)	(64,021)		(61,723)		(125,440)	[1]	(116,983)	[1]
Net Income (Loss)	(38,782)		(40,335)		(76,426)	[1]	(76,177)	[1]
Insurance-Domestic Segment [Member]
Segment Reporting Information [Line Items]
Earned Premiums	925,997		846,734		1,810,375		1,656,803
Insurance-Domestic Segment [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Earned Premiums	925,997		846,734		1,810,375		1,656,803
Investment Income and Funds	107,562		120,656		205,359		232,742
Other Revenues	27,652		27,036		54,388		50,913
Total revenues	1,061,211		994,426		2,070,122		1,940,458
Pre-Tax Income (Loss)	152,334		144,640		293,684		292,375
Net Income (Loss)	106,478		103,435		205,886		209,315
Insurance-International Segment [Member]
Segment Reporting Information [Line Items]
Earned Premiums	180,192		154,501		351,311		298,386
Insurance-International Segment [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Earned Premiums	180,192		154,501		351,311		298,386
Investment Income and Funds	13,171		11,194		25,232		21,525
Other Revenues	0		0		0		0
Total revenues	193,363		165,695		376,543		319,911
Pre-Tax Income (Loss)	12,583		13,782		34,965		29,481
Net Income (Loss)	9,092		9,833		24,569		20,945
Reinsurance-Global Segment [Member]
Segment Reporting Information [Line Items]
Earned Premiums	176,326		146,122		352,948		291,819
Reinsurance-Global Segment [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Earned Premiums	176,326		146,122		352,948		291,819
Investment Income and Funds	23,036		28,451		45,535		57,138
Other Revenues	0		0		0		0
Total revenues	199,362		174,573		398,483		348,957
Pre-Tax Income (Loss)	24,752		27,454		62,693		59,092
Net Income (Loss)	$ 17,681		$ 20,055		$ 44,075		$ 43,141

[1]

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Fair Value Of Financial Instruments

6 Months Ended

Jun. 30, 2013

Fair Value Disclosures [Abstract]

Fair Value Of Financial Instruments

Fair Value Measurements

The Company’s fixed maturity and equity securities available for sale and its arbitrage 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.

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, 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 projections, credit quality and business developments of the issuer and other relevant information.

The following tables present the assets and liabilities measured at fair value, on a recurring basis, as of June 30, 2013 and December 31, 2012 by Level:

(In thousands)	Total		Level 1		Level 2		Level 3
June 30, 2013
Assets:
Fixed maturity securities available for sale:
U.S. government and agency	$	844,102	$	—	$	844,102	$	—
State and municipal	4,147,252		—		4,147,252		—
Mortgage-backed securities	1,559,753		—		1,559,753		—
Corporate	3,860,862		—		3,809,941		50,921
Foreign	1,121,459		—		1,121,459		—
Total fixed maturity securities available for sale	11,533,428		—		11,482,507		50,921
Equity securities:
Common stocks	330,636		329,398		—		1,238
Preferred stocks	104,205		—		100,428		3,777
Total equity securities	434,841		329,398		100,428		5,015
Arbitrage trading account	680,713		179,841		500,789		83
Total	$	12,648,982	$	509,239	$	12,083,724	$	56,019
Liabilities:
Securities sold but not yet purchased	$	171,990	$	117,636	$	54,354	$	—
December 31, 2012
Assets:
Fixed maturity securities available for sale:
U.S. government and agency	$	898,463	$	—	$	898,463	$	—
State and municipal	4,768,519		—		4,768,519		—
Mortgage-backed securities	1,715,697		—		1,715,697		—
Corporate	3,346,719		—		3,287,654		59,065
Foreign	1,111,607		—		1,111,607		—
Total fixed maturity securities available for sale	11,841,005		—		11,781,940		59,065
Equity securities:
Common stocks	282,066		280,658		—		1,408
Preferred stocks	93,956		—		93,335		621
Total equity securities	376,022		280,658		93,335		2,029
Arbitrage trading account	329,077		233,603		94,546		928
Total	$	12,546,104	$	514,261	$	11,969,821	$	62,022
Liabilities:
Securities sold but not yet purchased	$	121,487	$	114,909	$	6,558	$	20

There were no significant transfers between Levels 1 and 2 during the six months ended June 30, 2013 or during the year ended December 31, 2012.

The following tables summarize changes in Level 3 assets and liabilities for the six months ended June 30, 2013 and for the year ended December 31, 2012:

			Gains (Losses) Included in
(In thousands)	Beginning Balance		Earnings			Other Comprehensive Income			Purchases		(Sales)			Maturities			Transfer in		Ending Balance
Six months ended June 30, 2013:
Assets:
Fixed maturities available for sale:
Corporate	$	59,065	$	(64	)	$	(867	)	$	84	$	(2,577	)	$	(4,720	)	$	—	$	50,921
Total	59,065		(64		)	(867		)	84		(2,577		)	(4,720		)	—		50,921
Equity securities available for sale:
Common stocks	1,408		—			—			—		(170		)	—			—		1,238
Preferred stocks	621		(274		)	—			3,430		—			—			—		3,777
Total	2,029		(274		)	—			3,430		(170		)	—			—		5,015
Arbitrage trading account	928		(815		)	—			824		(854		)	—			—		83
Total	$	62,022	$	(1,153	)	$	(867	)	$	4,338	$	(3,601	)	$	(4,720	)	$	—	$	56,019
Liabilities:
Securities sold but not yet purchased	$	20	$	(4	)	$	—		$	4	$	(20	)	$	—		$	—	$	—
Year ended December 31, 2012:
Assets:
Fixed maturities available for sale:
Corporate	$	67,828	$	(1,497	)	$	9,622		$	283	$	—		$	(17,171	)	$	—	$	59,065
Total	67,828		(1,497		)	9,622			283		—			(17,171		)	—		59,065
Equity securities available for sale:
Common stocks	1,559		—			—			—		(151		)	—			—		1,408
Preferred stocks	12,303		1,126			(1,737		)	—		(11,071		)	—			—		621
Total	13,862		1,126			(1,737		)	—		(11,222		)	—			—		2,029
Arbitrage trading account	851		(3,534		)	3,570			—		(52		)	—			93		928
Total	$	82,541	$	(3,905	)	$	11,455		$	283	$	(11,274	)	$	(17,171	)	$	93	$	62,022
Liabilities:
Securities sold but not yet purchased	$	21	$	(1	)	$	—		$	—	$	—		$	—		$	—	$	20

There were no significant transfers in or out of Level 3 during the six months ended June 30, 2013 or during the year ended December 31, 2012.

Fair Value of Financial Instruments

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

	June 30, 2013				December 31, 2012
(In thousands)	Carrying Value		Fair Value		Carrying Value		Fair Value
Assets:
Fixed maturity securities	$	11,635,178	$	11,652,382	$	11,943,956	$	11,968,376
Equity securities available for sale	434,841		434,841		376,022		376,022
Arbitrage trading account	680,713		680,713		329,077		329,077
Loans receivable	359,177		363,942		401,961		406,443
Cash and cash equivalents	658,839		658,839		905,670		905,670
Trading account receivables from brokers and clearing organizations	144,150		144,150		446,873		446,873
Due from broker	8,901		8,901		14,449		14,449
Liabilities:
Trading account securities sold but not yet purchased	171,990		171,990		121,487		121,487
Junior subordinated debentures	339,614		327,040		243,206		252,000
Senior notes and other debt	1,695,986		1,889,098		1,871,535		2,190,173

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 junior subordinated debentures is based on spreads for similar securities, which is considered a Level 2 input.

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Consolidated Statements of Stockholders' Equity (USD $) In Thousands	Total	Common stocks	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Unrealized Investment Gains (Losses) [Member]	Currency Translation Adjustments [Member]	Net Pension Asset [Member]	Treasury Stock [Member]	Noncontrolling Interest [Member]
Stockholders' Equity, beginning of period at Dec. 31, 2011		$ 47,024	$ 941,109	$ 4,491,162		$ 430,419	$ (61,239)	$ (14,329)	$ (1,880,790)	$ 7,526
Adjustments to Additional Paid in Capital Stock Issued During Period, Value, Stock Options Exercised, Value, Restricted Stock Issued Net of Tax Benefit Expense			(12,092)
Adjustments to Additional Paid in Capital, Share-based Compensation, Restricted Stock Unit or Restricted Stock Award, Requisite Service Period Recognition			14,792
Stock issued to directors			454						581
Net income before noncontrolling interests	(244,136)			(244,156)						(20)
Dividends				(23,482)
Unrealized investment gain related to non-controlling interest	61,559					60,275
Unrealized gains on other-than-temporarily impaired securities						1,256
Net change in period	(1,674)						(1,674)
Change in net pension asset, net of taxes	1,647							1,647
Stock exercised/vested									23,393
Stock repurchased									(54,878)
Contributions (distributions)										1,524
Net income (loss)	20
Other comprehensive income (loss), net of tax	61,532									28
Stockholders' Equity, end of period at Jun. 30, 2012			944,263	4,711,836	416,355	491,950	(62,913)	(12,682)	(1,911,694)	9,058
Stockholders' Equity, beginning of period at Dec. 31, 2012	4,335,466	47,024	945,166	4,817,807		517,658	(36,676)	(15,351)	(1,969,411)	29,249
Adjustments to Additional Paid in Capital Stock Issued During Period, Value, Stock Options Exercised, Value, Restricted Stock Issued Net of Tax Benefit Expense			(311)
Adjustments to Additional Paid in Capital, Share-based Compensation, Restricted Stock Unit or Restricted Stock Award, Requisite Service Period Recognition			10,694
Stock issued to directors			535						597
Net income before noncontrolling interests	(231,725)			(232,572)						(847)
Dividends				(25,814)
Unrealized investment gain related to non-controlling interest	(189,250)					(189,594)
Unrealized gains on other-than-temporarily impaired securities						339
Net change in period	(69,779)						(69,779)
Change in net pension asset, net of taxes	3,628							3,628
Stock exercised/vested									882
Stock repurchased									(31,362)
Contributions (distributions)										(1,356)
Net income (loss)	847
Other comprehensive income (loss), net of tax	(255,401)				(255,401)		(69,779)	3,628		5
Stockholders' Equity, end of period at Jun. 30, 2013	4,265,655		956,084	5,024,565	210,225	328,403	(106,455)	(11,723)	(1,999,294)	27,051
Stockholders' Equity, beginning of period at Mar. 31, 2013
Net income before noncontrolling interests	(115,127)
Unrealized investment gain related to non-controlling interest	(197,060)
Net change in period	(23,156)
Change in net pension asset, net of taxes	1,814
Net income (loss)	830
Other comprehensive income (loss), net of tax	(218,402)				(218,402)		(23,156)	1,814
Stockholders' Equity, end of period at Jun. 30, 2013	$ 4,265,655				$ 210,225		$ (106,455)	$ (11,723)

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General

6 Months Ended

Jun. 30, 2013

General Policies Disclosure [Abstract]

General

General

The accompanying unaudited consolidated financial statements of W. R. Berkley Corporation and its subsidiaries (the “Company”) have been prepared in accordance with 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 requires the use of management estimates. 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, 2012. Reclassifications have been made in the 2012 financial statements as originally reported to conform to the presentation of the 2013 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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Acquistions (Notes)

6 Months Ended

Jun. 30, 2013

Business Combinations [Abstract]

Acquisitions

Acquisitions

In 2012, the Company acquired a 49% interest in a worldwide supplier of after-market original equipment manufacturer (OEM) parts, systems and custom logistic support services for military aircraft operations for $43 million. In January 2013, the Company acquired the remaining 51% of this business for $43 million. The estimated useful lives of the intangible assets acquired range from 2 years to 15 years, with approximately $3 million having an indefinite life.

The following table summarizes the estimated fair value of net assets acquired and liabilities assumed at the date of acquisition:

(In thousands)	Acquired in 2013
Cash and cash equivalents	$	3,911
Real estate, furniture and equipment	898
Goodwill	19,664
Intangible assets	44,800
Other assets	60,661
Total assets acquired	129,934
Debt	(27,612		)
Other liabilities assumed	(17,076		)
Net assets acquired	$	85,246

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Per Share Data

6 Months Ended

Jun. 30, 2013

Earnings Per Share [Abstract]

Per Share Data

Per Share Data

The Company presents both basic and diluted net income per share (“EPS”) amounts. Basic EPS is calculated by dividing net income by 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:

(In thousands)	For the Three Months Ended		For the Six Months Ended
	June 30,		June 30,
	2013	2012	2013	2012
Basic	135,894	138,181	135,959	137,997
Diluted	141,274	143,528	141,257	143,506

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Fair Value of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2013

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:

	June 30, 2013				December 31, 2012
(In thousands)	Carrying Value		Fair Value		Carrying Value		Fair Value
Assets:
Fixed maturity securities	$	11,635,178	$	11,652,382	$	11,943,956	$	11,968,376
Equity securities available for sale	434,841		434,841		376,022		376,022
Arbitrage trading account	680,713		680,713		329,077		329,077
Loans receivable	359,177		363,942		401,961		406,443
Cash and cash equivalents	658,839		658,839		905,670		905,670
Trading account receivables from brokers and clearing organizations	144,150		144,150		446,873		446,873
Due from broker	8,901		8,901		14,449		14,449
Liabilities:
Trading account securities sold but not yet purchased	171,990		171,990		121,487		121,487
Junior subordinated debentures	339,614		327,040		243,206		252,000
Senior notes and other debt	1,695,986		1,889,098		1,871,535		2,190,173

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Per Share Data (Tables)

6 Months Ended

Jun. 30, 2013

Earnings Per Share [Abstract]

Weighted average number of common shares used in computation of basic and diluted earnings per share

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

(In thousands)	For the Three Months Ended		For the Six Months Ended
	June 30,		June 30,
	2013	2012	2013	2012
Basic	135,894	138,181	135,959	137,997
Diluted	141,274	143,528	141,257	143,506

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Investments in Equity Securities (Tables) (Equity Securities [Member])

6 Months Ended

Jun. 30, 2013

Equity Securities [Member]

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

Schedule of Investments in Equity Securities

At June 30, 2013 and December 31, 2012, investments in equity securities were as follows:

(In thousands)	Cost		Gross Unrealized					Fair Value		Carrying Value
			Gains		Losses
June 30, 2013
Common stocks	$	275,719	$	60,277	$	(5,360	)	$	330,636	$	330,636
Preferred stocks	82,905		25,684		(4,384		)	104,205		104,205
Total	$	358,624	$	85,961	$	(9,744	)	$	434,841	$	434,841
December 31, 2012
Common stocks	$	222,671	$	60,102	$	(707	)	$	282,066	$	282,066
Preferred stocks	85,504		10,103		(1,651		)	93,956		93,956
Total	$	308,175	$	70,205	$	(2,358	)	$	376,022	$	376,022

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Industry Segments (Net Premiums Earned By Major Line of Business) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Revenue from External Customer [Line Items]
Net premiums earned	$ 1,282,515		$ 1,147,357		$ 2,514,634		$ 2,247,008
Insurance-Domestic Segment [Member]
Revenue from External Customer [Line Items]
Net premiums earned	925,997		846,734		1,810,375		1,656,803
Insurance-Domestic Segment [Member] | Other Liability [Member]
Revenue from External Customer [Line Items]
Net premiums earned	307,444		257,781		603,032		531,345
Insurance-Domestic Segment [Member] | Workers' Compensation [Member]
Revenue from External Customer [Line Items]
Net premiums earned	241,191		224,562		470,202		414,106
Insurance-Domestic Segment [Member] | Short-tail lines [Member]
Revenue from External Customer [Line Items]
Net premiums earned	192,938	[1]	189,390	[1]	371,687	[1]	363,292	[1]
Insurance-Domestic Segment [Member] | Commercial Automobile [Member]
Revenue from External Customer [Line Items]
Net premiums earned	119,900		112,532		236,022		222,899
Insurance-Domestic Segment [Member] | Products Liability [Member]
Revenue from External Customer [Line Items]
Net premiums earned	64,524		62,469		129,432		125,161
Insurance-International Segment [Member]
Revenue from External Customer [Line Items]
Net premiums earned	180,192		154,501		351,311		298,386
Insurance-International Segment [Member] | Other Liability [Member]
Revenue from External Customer [Line Items]
Net premiums earned	15,070		17,745		30,288		33,279
Insurance-International Segment [Member] | Workers' Compensation [Member]
Revenue from External Customer [Line Items]
Net premiums earned	21,746		19,898		44,635		38,516
Insurance-International Segment [Member] | Short-tail lines [Member]
Revenue from External Customer [Line Items]
Net premiums earned	84,301	[1]	63,831	[1]	156,424	[1]	116,309	[1]
Insurance-International Segment [Member] | Commercial Automobile [Member]
Revenue from External Customer [Line Items]
Net premiums earned	32,392		29,606		67,031		60,274
Insurance-International Segment [Member] | Products Liability [Member]
Revenue from External Customer [Line Items]
Net premiums earned	26,683		23,421		52,933		50,008
Reinsurance-Global Segment [Member]
Revenue from External Customer [Line Items]
Net premiums earned	176,326		146,122		352,948		291,819
Reinsurance-Global Segment [Member] | Short-tail lines [Member]
Revenue from External Customer [Line Items]
Net premiums earned	54,209		42,848		109,504		83,456
Reinsurance-Global Segment [Member] | Casualty [Member]
Revenue from External Customer [Line Items]
Net premiums earned	$ 122,117		$ 103,274		$ 243,444		$ 208,363

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

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Realized And Unrealized Investment Gains (Losses) (Tables)

6 Months Ended

Jun. 30, 2013

Realized and Unrealized Investment Gains (Losses) [Abstract]

Realized and Unrealized Investment Gains (Losses)

Realized and unrealized investment gains and losses are as follows:

	For the Three Months Ended June 30,						For the Six Months Ended June 30,
(In thousands)	2013			2012			2013			2012
Realized investment gains and losses:
Fixed maturity securities:
Gains	$	9,147		$	5,652		$	20,143		$	20,607
Losses	(5,500		)	(1,763		)	(11,466		)	(2,306		)
Equity securities available for sale	18,086			18,188			33,331			44,426
Investment funds	10,843			2,191			11,037			3,501
Other	482			18			(18		)	1,535
Total	33,058			24,286			53,027			67,763
Change in valuation allowance, net other-than-temporary impairments:
Decrease in valuation allowance	—			—			—			6,998
Other-than-temporary impairments	—			—			—			(2,984		)
Total	—			—			—			4,014
Net investment gains	33,058			24,286			53,027			71,777
Income tax expense	(11,570		)	(8,436		)	(18,559		)	(24,845		)
Total after-tax investment gains	$	21,488		$	15,850		$	34,468		$	46,932

Unrealized Gain (Loss) on Investments

Change in unrealized investment gains and losses:
Fixed maturity securities	$	(277,791	)	$	71,138		$	(293,380	)	$	90,560
Previously impaired fixed maturity securities	(590		)	190			522			1,933
Equity securities available for sale	(16,191		)	(8,518		)	8,370			3,077
Investment funds	(5,906		)	(2,651		)	(9,174		)	(974		)
Total change in unrealized investment gains and losses	(300,478		)	60,159			(293,662		)	94,596
Income tax benefit (expense)	103,418			(20,624		)	104,412			(33,037		)
Noncontrolling interests	35			(5		)	(5		)	(28		)
Total after-tax unrealized gains and losses	$	(197,025	)	$	39,530		$	(189,255	)	$	61,531

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Industry Segments (Identifiable Assets by Segment) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013		Dec. 31, 2012
Segment Reporting, Asset Reconciling Item [Line Items]
Consolidated Assets	$ 20,211,542		$ 20,155,896
Operating Segments [Member] | Reinsurance-Global Segment [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Consolidated Assets	2,965,565		3,337,937
Operating Segments [Member] | Insurance-International Segment [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Consolidated Assets	1,449,188		1,541,365
Operating Segments [Member] | Insurance-Domestic Segment [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Consolidated Assets	14,849,126		14,661,476
Intersegment Eliminations and Corporate, Non-Segment [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Consolidated Assets	$ 947,663	[1]	$ 615,118	[1]

[1]

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Investment Funds Investment Funds (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]
Investment funds	$ 858,394		$ 809,689
Income (Losses) from Investment Funds	33,510	63,242
Real estate
Schedule of Equity Method Investments [Line Items]
Investment funds	381,855		373,259
Income (Losses) from Investment Funds	1,260	11,290
Energy
Schedule of Equity Method Investments [Line Items]
Investment funds	146,966		146,325
Income (Losses) from Investment Funds	25,199	49,780
Arbitrage
Schedule of Equity Method Investments [Line Items]
Investment funds	65,651		63,920
Income (Losses) from Investment Funds	1,731	(662)
Other
Schedule of Equity Method Investments [Line Items]
Investment funds	263,922		226,185
Income (Losses) from Investment Funds	$ 5,320	$ 2,834

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Investments in Fixed Maturity Securities (Investments in Fixed Maturity Securities) (Details) (USD $)	Jun. 30, 2013		Dec. 31, 2012
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Total held to maturity, Amortized Cost	$ 101,750,000		$ 102,951,000
Held to Maturity Securities Accumulated Unrecognized Holding Gain	17,204,000		24,420,000
Held to Maturity Securities Accumulated Unrecognized Holding Loss	0		0
Total held to maturity, Fair Value	118,954,000		127,371,000
Total held to maturity, Carrying Value	101,750,000		102,951,000
Total available for sale, Amortized Cost	11,100,284,000		11,115,003,000
Total available for sale, Gross Unrealized Gains	502,475,000		758,662,000
Total available for sale, Gross Unrealized Losses	(69,331,000)		(32,660,000)
Total available for sale, Fair Value	11,533,428,000		11,841,005,000
Total available for sale, Carrying Value	11,533,428,000		11,841,005,000
Total investment in fixed maturity securities, Amortized Cost	11,202,034,000		11,217,954,000
Total investments in fixed maturity securities, Gross Unrealized Gains	519,679,000		783,082,000
Total investments in fixed maturity securities, Gross Unrealized Losses	(69,331,000)		(32,660,000)
Total investments in fixed maturity securities, Fair Value	11,652,382,000		11,968,376,000
Total investments in fixed maturity securities, carrying value	11,635,178,000		11,943,956,000
Minimum ownership of Common stockholders equity	10.00%
State and municipal
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Total available for sale, Amortized Cost	3,961,116,000		4,449,238,000
Total available for sale, Gross Unrealized Gains	203,398,000		328,974,000
Total available for sale, Gross Unrealized Losses	(17,262,000)		(9,693,000)
Total available for sale, Fair Value	4,147,252,000		4,768,519,000
Total available for sale, Carrying Value	4,147,252,000		4,768,519,000
U.S. government and agency
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Total available for sale, Amortized Cost	799,530,000		827,591,000
Total available for sale, Gross Unrealized Gains	46,703,000		72,532,000
Total available for sale, Gross Unrealized Losses	(2,131,000)		(1,660,000)
Total available for sale, Fair Value	844,102,000		898,463,000
Total available for sale, Carrying Value	844,102,000		898,463,000
Residential Mortgage-Backed [Member]
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Total available for sale, Amortized Cost	1,361,874,000	[1]	1,395,739,000	[1]
Total available for sale, Gross Unrealized Gains	35,711,000	[1]	53,846,000	[1]
Total available for sale, Gross Unrealized Losses	(18,885,000)	[1]	(7,456,000)	[1]
Total available for sale, Fair Value	1,378,700,000	[1]	1,442,129,000	[1]
Total available for sale, Carrying Value	1,378,700,000	[1]	1,442,129,000	[1]
Non-credit portion of other-than-temporary impairments ("OTTI")	2,515,000		3,037,000
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Total available for sale, Amortized Cost	177,325,000		268,671,000
Total available for sale, Gross Unrealized Gains	4,915,000		5,641,000
Total available for sale, Gross Unrealized Losses	(1,187,000)		(744,000)
Total available for sale, Fair Value	181,053,000		273,568,000
Total available for sale, Carrying Value	181,053,000		273,568,000
Corporate
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Total available for sale, Amortized Cost	3,749,727,000		3,144,480,000
Total available for sale, Gross Unrealized Gains	134,148,000		214,322,000
Total available for sale, Gross Unrealized Losses	(23,013,000)		(12,083,000)
Total available for sale, Fair Value	3,860,862,000		3,346,719,000
Total available for sale, Carrying Value	3,860,862,000		3,346,719,000
Foreign
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Total available for sale, Amortized Cost	1,050,712,000		1,029,284,000
Total available for sale, Gross Unrealized Gains	77,600,000		83,347,000
Total available for sale, Gross Unrealized Losses	(6,853,000)		(1,024,000)
Total available for sale, Fair Value	1,121,459,000		1,111,607,000
Total available for sale, Carrying Value	1,121,459,000		1,111,607,000
State and municipal
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Total held to maturity, Amortized Cost	67,092,000		65,190,000
Held to Maturity Securities Accumulated Unrecognized Holding Gain	12,680,000		18,529,000
Held to Maturity Securities Accumulated Unrecognized Holding Loss	0		0
Total held to maturity, Fair Value	79,772,000		83,719,000
Total held to maturity, Carrying Value	67,092,000		65,190,000
Residential Mortgage-Backed [Member]
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Total held to maturity, Amortized Cost	29,661,000		32,764,000
Held to Maturity Securities Accumulated Unrecognized Holding Gain	4,010,000		5,286,000
Held to Maturity Securities Accumulated Unrecognized Holding Loss	0		0
Total held to maturity, Fair Value	33,671,000		38,050,000
Total held to maturity, Carrying Value	29,661,000		32,764,000
Corporate
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Total held to maturity, Amortized Cost	4,997,000		4,997,000
Held to Maturity Securities Accumulated Unrecognized Holding Gain	514,000		605,000
Held to Maturity Securities Accumulated Unrecognized Holding Loss	0		0
Total held to maturity, Fair Value	5,511,000		5,602,000
Total held to maturity, Carrying Value	$ 4,997,000		$ 4,997,000

[1] Gross unrealized losses for residential mortgage-backed securities include $2,515,000 and $3,037,000 as of June 30, 2013 and December 31, 2012, respectively, related to the non-credit portion of other-than-temporary impairments (“OTTI”) recognized in other comprehensive income.

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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) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Earnings Per Share [Abstract]
Basic (shares)	135,894	138,181	135,959	137,997
Diluted (shares)	141,274	143,528	141,257	143,506

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Consolidated Balance Sheets Balance Sheet (Parentheticals) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Statement of Financial Position [Abstract]
Preferred Stock, Par or Stated Value Per Share	$ 0.1	$ 0.1
Preferred Stock, Shares Authorized	5,000,000	5,000,000
Preferred Stock, Shares Issued	0	0
Preferred Stock, Shares Outstanding	0	0
Common Stock, Par or Stated Value Per Share	$ 0.2	$ 0.2
Common Stock, Shares Authorized	500,000,000	500,000,000
Common Stock, Shares, Issued	135,308,430	136,017,732
Common Stock, Shares, Outstanding	135,308,430	136,017,732
Treasury Stock, Shares	99,809,488	99,100,186

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Investments In Fixed Maturity Securities (Debt Securities [Member])

6 Months Ended

Jun. 30, 2013

Debt Securities [Member]

Schedule of Marketable Securities [Line Items]

Investments In Fixed Maturity Securities

Investments in Fixed Maturity Securities

At June 30, 2013 and December 31, 2012, investments in fixed maturity securities were as follows:

(In thousands)	Amortized Cost		Gross Unrealized					Fair Value		Carrying Value
			Gains		Losses
June 30, 2013
Held to maturity:
State and municipal	$	67,092	$	12,680	$	—		$	79,772	$	67,092
Residential mortgage-backed	29,661		4,010		—			33,671		29,661
Corporate	4,997		514		—			5,511		4,997
Total held to maturity	101,750		17,204		—			118,954		101,750
Available for sale:
U.S. government and government agency	799,530		46,703		(2,131		)	844,102		844,102
State and municipal	3,961,116		203,398		(17,262		)	4,147,252		4,147,252
Mortgage-backed securities:
Residential (1)	1,361,874		35,711		(18,885		)	1,378,700		1,378,700
Commercial	177,325		4,915		(1,187		)	181,053		181,053
Corporate	3,749,727		134,148		(23,013		)	3,860,862		3,860,862
Foreign	1,050,712		77,600		(6,853		)	1,121,459		1,121,459
Total available for sale	11,100,284		502,475		(69,331		)	11,533,428		11,533,428
Total investments in fixed maturity securities	$	11,202,034	$	519,679	$	(69,331	)	$	11,652,382	$	11,635,178
December 31, 2012
Held to maturity:
State and municipal	$	65,190	$	18,529	$	—		$	83,719	$	65,190
Residential mortgage-backed	32,764		5,286		—			38,050		32,764
Corporate	4,997		605		—			5,602		4,997
Total held to maturity	102,951		24,420		—			127,371		102,951
Available for sale:
U.S. government and government agency	827,591		72,532		(1,660		)	898,463		898,463
State and municipal	4,449,238		328,974		(9,693		)	4,768,519		4,768,519
Mortgage-backed securities:
Residential (1)	1,395,739		53,846		(7,456		)	1,442,129		1,442,129
Commercial	268,671		5,641		(744		)	273,568		273,568
Corporate	3,144,480		214,322		(12,083		)	3,346,719		3,346,719
Foreign	1,029,284		83,347		(1,024		)	1,111,607		1,111,607
Total available for sale	11,115,003		758,662		(32,660		)	11,841,005		11,841,005
Total investments in fixed maturity securities	$	11,217,954	$	783,082	$	(32,660	)	$	11,968,376	$	11,943,956

___________

(1) Gross unrealized losses for residential mortgage-backed securities include $2,515,000 and $3,037,000 as of June 30, 2013 and December 31, 2012, respectively, related to the non-credit portion of other-than-temporary impairments (“OTTI”) recognized in other comprehensive income.

The amortized cost and fair value of fixed maturity securities at June 30, 2013, 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	$	900,989	$	925,233
Due after one year through five years	3,555,283		3,697,764
Due after five years through ten years	2,686,863		2,853,103
Due after ten years	2,490,039		2,582,858
Mortgage-backed securities	1,568,860		1,593,424
Total	$	11,202,034	$	11,652,382

At June 30, 2013, there were no investments, other than investments in United States government and government agency securities, which exceeded 10% of common stockholders’ equity.

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Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Statement of Comprehensive Income [Abstract]
Net income before noncontrolling interests	$ 115,127	$ 108,904	$ 231,725	$ 244,136
Other comprehensive income (loss):
Change in unrealized translation adjustments	(23,156)	(17,257)	(69,779)	(1,674)
Change in unrealized investment gains (losses), net of taxes	(197,060)	39,535	(189,250)	61,559
Change in net pension asset, net of taxes	1,814	823	3,628	1,647
Other comprehensive income (loss)	(218,402)	23,101	(255,401)	61,532
Comprehensive income (loss)	(103,275)	132,005	(23,676)	305,668
Comprehensive (income) loss to the noncontrolling interest	865	(71)	842	(8)
Comprehensive income (loss) to common stockholders	$ (102,410)	$ 131,934	$ (22,834)	$ 305,660

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Loans Receivable (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 359,177,000		$ 359,177,000		$ 401,961,000
Valuation allowance of loans receivable	1,844,000		1,844,000		5,620,000
Impaired loans, with a valuation allowance	0		0		1,775,000
Impaired loans, without a valuation allowance	30,000,000		30,000,000		31,023,000
Impaired loans, unpaid principal balance	30,000,000		30,000,000		35,872,000
Decrease in valuation allowance	(30,000)	123,000	65,000	6,773,000
Loans receivable charged off	0	0	0	85,000
Aggregate cost basis of loans cosidered impaired	30,000,000		30,000,000
Number of Loans Deemed Impaired [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans			1
Commercial and Construction Real Estate and Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Valuation allowance, specific	0		0		3,000,000
Valuation allowance, general	1,844,000		1,844,000		2,620,000
Six Larget Loans Receivable [Member] | Credit Concentration Risk [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	247,000,000		247,000,000
Number of loans			6
Aggregate amortized cost	$ 244,000,000		$ 244,000,000

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Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Investments:
Fixed maturity securities	$ 11,635,178	$ 11,943,956
Equity securities	434,841	376,022
Arbitrage trading account	680,713	329,077
Investment funds	858,394	809,689
Loans receivable	359,177	401,961
Real estate	589,936	606,735
Total investments	14,558,239	14,467,440
Cash and cash equivalents	658,839	905,670
Premiums and fees receivable	1,582,395	1,440,752
Due from reinsurers	1,477,381	1,450,348
Accrued investment income	126,122	127,230
Prepaid reinsurance premiums	382,570	316,309
Deferred policy acquisition costs	433,274	404,047
Real estate, furniture and equipment	291,831	267,227
Federal and foreign income taxes - current and deferred	67,666	0
Goodwill	112,741	87,865
Trading account receivables from brokers and clearing organizations	144,150	446,873
Other assets	376,334	242,135
Total assets	20,211,542	20,155,896
Liabilities:
Reserves for losses and loss expenses	9,921,072	9,751,086
Unearned premiums	2,721,228	2,474,847
Due to reinsurers	337,370	316,388
Trading account securities sold but not yet purchased	171,990	121,487
Federal and foreign income taxes - current and deferred	0	82,801
Other liabilities	758,627	959,080
Junior subordinated debentures	339,614	243,206
Senior notes and other debt	1,695,986	1,871,535
Total liabilities	15,945,887	15,820,430
Equity:
Preferred stock, par value $.10 per share: Authorized 5,000,000 shares; issued and outstanding - none	0	0
Common stock, Value issued $.20 per share:Authorized 500,000,000 shares, issued and outstanding, net of treasury shares, 135,308,430 and 136,017,732 shares	47,024	47,024
Additional paid-in capital	956,084	945,166
Retained earnings	5,024,565	4,817,807
Accumulated other comprehensive income	210,225	465,631
Treasury stock, at cost, 99,809,488 and 99,100,186 shares, respectively	(1,999,294)	(1,969,411)
Total stockholders’ equity	4,238,604	4,306,217
Noncontrolling interests	27,051	29,249
Total equity	4,265,655	4,335,466
Total liabilities and equity	$ 20,211,542	$ 20,155,896

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Investments in Fixed Maturity Securities (The Amortized Cost and Fair Value of Fixed Maturity Securities) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Marketable Securities, Fixed Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Amortized Cost, Due in one year or less	$ 900,989
Amortized Cost, Due after one year through five years	3,555,283
Amortized Cost, Due after five years through ten years	2,686,863
Amortized Cost, Due after ten years	2,490,039
Amortized Cost, Mortgage-backed securities	1,568,860
Total investment in fixed maturity securities, Amortized Cost	11,202,034	11,217,954
Fair Value, Due in one year or less	925,233
Fair Value, Due after one year through five years	3,697,764
Fair Value, Due after five years through ten years	2,853,103
Fair Value, Due after ten years	2,582,858
Fair Value, Mortgage-backed securities	1,593,424
Total investments in fixed maturity securities, Fair Value	$ 11,652,382	$ 11,968,376

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Acquistions (Tables)

6 Months Ended

Jun. 30, 2013

Business Combinations [Abstract]

Summary of fair value of net assets acquired and liabilities assumed

The following table summarizes the estimated fair value of net assets acquired and liabilities assumed at the date of acquisition:

(In thousands)	Acquired in 2013
Cash and cash equivalents	$	3,911
Real estate, furniture and equipment	898
Goodwill	19,664
Intangible assets	44,800
Other assets	60,661
Total assets acquired	129,934
Debt	(27,612		)
Other liabilities assumed	(17,076		)
Net assets acquired	$	85,246

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Fair Value Measurements

6 Months Ended

Jun. 30, 2013

Assets, Fair Value Disclosure [Abstract]

Fair Value Measurements

Fair Value Measurements

The Company’s fixed maturity and equity securities available for sale and its arbitrage 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.

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, 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 projections, credit quality and business developments of the issuer and other relevant information.

The following tables present the assets and liabilities measured at fair value, on a recurring basis, as of June 30, 2013 and December 31, 2012 by Level:

(In thousands)	Total		Level 1		Level 2		Level 3
June 30, 2013
Assets:
Fixed maturity securities available for sale:
U.S. government and agency	$	844,102	$	—	$	844,102	$	—
State and municipal	4,147,252		—		4,147,252		—
Mortgage-backed securities	1,559,753		—		1,559,753		—
Corporate	3,860,862		—		3,809,941		50,921
Foreign	1,121,459		—		1,121,459		—
Total fixed maturity securities available for sale	11,533,428		—		11,482,507		50,921
Equity securities:
Common stocks	330,636		329,398		—		1,238
Preferred stocks	104,205		—		100,428		3,777
Total equity securities	434,841		329,398		100,428		5,015
Arbitrage trading account	680,713		179,841		500,789		83
Total	$	12,648,982	$	509,239	$	12,083,724	$	56,019
Liabilities:
Securities sold but not yet purchased	$	171,990	$	117,636	$	54,354	$	—
December 31, 2012
Assets:
Fixed maturity securities available for sale:
U.S. government and agency	$	898,463	$	—	$	898,463	$	—
State and municipal	4,768,519		—		4,768,519		—
Mortgage-backed securities	1,715,697		—		1,715,697		—
Corporate	3,346,719		—		3,287,654		59,065
Foreign	1,111,607		—		1,111,607		—
Total fixed maturity securities available for sale	11,841,005		—		11,781,940		59,065
Equity securities:
Common stocks	282,066		280,658		—		1,408
Preferred stocks	93,956		—		93,335		621
Total equity securities	376,022		280,658		93,335		2,029
Arbitrage trading account	329,077		233,603		94,546		928
Total	$	12,546,104	$	514,261	$	11,969,821	$	62,022
Liabilities:
Securities sold but not yet purchased	$	121,487	$	114,909	$	6,558	$	20

There were no significant transfers between Levels 1 and 2 during the six months ended June 30, 2013 or during the year ended December 31, 2012.

The following tables summarize changes in Level 3 assets and liabilities for the six months ended June 30, 2013 and for the year ended December 31, 2012:

			Gains (Losses) Included in
(In thousands)	Beginning Balance		Earnings			Other Comprehensive Income			Purchases		(Sales)			Maturities			Transfer in		Ending Balance
Six months ended June 30, 2013:
Assets:
Fixed maturities available for sale:
Corporate	$	59,065	$	(64	)	$	(867	)	$	84	$	(2,577	)	$	(4,720	)	$	—	$	50,921
Total	59,065		(64		)	(867		)	84		(2,577		)	(4,720		)	—		50,921
Equity securities available for sale:
Common stocks	1,408		—			—			—		(170		)	—			—		1,238
Preferred stocks	621		(274		)	—			3,430		—			—			—		3,777
Total	2,029		(274		)	—			3,430		(170		)	—			—		5,015
Arbitrage trading account	928		(815		)	—			824		(854		)	—			—		83
Total	$	62,022	$	(1,153	)	$	(867	)	$	4,338	$	(3,601	)	$	(4,720	)	$	—	$	56,019
Liabilities:
Securities sold but not yet purchased	$	20	$	(4	)	$	—		$	4	$	(20	)	$	—		$	—	$	—
Year ended December 31, 2012:
Assets:
Fixed maturities available for sale:
Corporate	$	67,828	$	(1,497	)	$	9,622		$	283	$	—		$	(17,171	)	$	—	$	59,065
Total	67,828		(1,497		)	9,622			283		—			(17,171		)	—		59,065
Equity securities available for sale:
Common stocks	1,559		—			—			—		(151		)	—			—		1,408
Preferred stocks	12,303		1,126			(1,737		)	—		(11,071		)	—			—		621
Total	13,862		1,126			(1,737		)	—		(11,222		)	—			—		2,029
Arbitrage trading account	851		(3,534		)	3,570			—		(52		)	—			93		928
Total	$	82,541	$	(3,905	)	$	11,455		$	283	$	(11,274	)	$	(17,171	)	$	93	$	62,022
Liabilities:
Securities sold but not yet purchased	$	21	$	(1	)	$	—		$	—	$	—		$	—		$	—	$	20

There were no significant transfers in or out of Level 3 during the six months ended June 30, 2013 or during the year ended December 31, 2012.

Fair Value of Financial Instruments

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

	June 30, 2013				December 31, 2012
(In thousands)	Carrying Value		Fair Value		Carrying Value		Fair Value
Assets:
Fixed maturity securities	$	11,635,178	$	11,652,382	$	11,943,956	$	11,968,376
Equity securities available for sale	434,841		434,841		376,022		376,022
Arbitrage trading account	680,713		680,713		329,077		329,077
Loans receivable	359,177		363,942		401,961		406,443
Cash and cash equivalents	658,839		658,839		905,670		905,670
Trading account receivables from brokers and clearing organizations	144,150		144,150		446,873		446,873
Due from broker	8,901		8,901		14,449		14,449
Liabilities:
Trading account securities sold but not yet purchased	171,990		171,990		121,487		121,487
Junior subordinated debentures	339,614		327,040		243,206		252,000
Senior notes and other debt	1,695,986		1,889,098		1,871,535		2,190,173

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 junior subordinated debentures is based on spreads for similar securities, which is considered a Level 2 input.

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General (Details)	6 Months Ended
	Jun. 30, 2013
General Policies Disclosure [Abstract]
Federal income tax rate	35.00%

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Net Investment Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Net Investment Income [Line Items]
Investment income	$ 145,519	$ 162,691	$ 283,460	$ 321,409
Investment expense	(1,782)	(1,441)	(3,794)	(2,540)
Net investment income	143,737	161,250	279,666	318,869
Fixed maturity securities, including cash and cash equivalents and loans receivable
Net Investment Income [Line Items]
Investment income	111,203	119,835	229,039	239,123
Investment funds
Net Investment Income [Line Items]
Investment income	22,576	35,619	33,510	63,242
Arbitrage trading account
Net Investment Income [Line Items]
Investment income	4,990	60	8,773	6,541
Equity securities available for sale
Net Investment Income [Line Items]
Investment income	3,634	3,829	5,881	6,979
Real estate
Net Investment Income [Line Items]
Investment income	$ 3,116	$ 3,348	$ 6,257	$ 5,524

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Fair Value Measurements (Summarize Changes in Level 3 Assets) (Details) (Level 3, USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, beginning balance	$ 62,022	$ 82,541
Assets, earnings	(1,153)	(3,905)
Assets, other comprehensive income	(867)	11,455
Assets, purchases	4,338	283
Assets, (sales)	(3,601)	(11,274)
Assets, maturities	(4,720)	(17,171)
Assets, transfer out	0	93
Assets, ending balance	56,019	62,022
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Liabilities, beginning balance	20	21
Liabilities, earnings	(4)	(1)
Liabilities, Other Comprehensive Income	0	0
Liabilities, purchases	4	0
Liabilities, (sales)	20	0
Liabilities, maturities	0	0
Liabilities, transfer out	0	0
Liabilities, ending balance	0	20
Debt Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, beginning balance	59,065	67,828
Assets, earnings	(64)	(1,497)
Assets, other comprehensive income	(867)	9,622
Assets, purchases	84	283
Assets, (sales)	(2,577)	0
Assets, maturities	(4,720)	(17,171)
Assets, transfer out	0	0
Assets, ending balance	50,921	59,065
Corporate
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, beginning balance	59,065	67,828
Assets, earnings	(64)	(1,497)
Assets, other comprehensive income	(867)	9,622
Assets, purchases	84	283
Assets, (sales)	(2,577)	0
Assets, maturities	(4,720)	(17,171)
Assets, transfer out	0	0
Assets, ending balance	50,921	59,065
Equity Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, beginning balance	2,029	13,862
Assets, earnings	(274)	1,126
Assets, other comprehensive income	0	(1,737)
Assets, purchases	3,430	0
Assets, (sales)	(170)	(11,222)
Assets, maturities	0	0
Assets, transfer out	0	0
Assets, ending balance	5,015	2,029
Preferred stocks
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, beginning balance	621	12,303
Assets, earnings	(274)	1,126
Assets, other comprehensive income	0	(1,737)
Assets, purchases	3,430	0
Assets, (sales)	0	(11,071)
Assets, maturities	0	0
Assets, transfer out	0	0
Assets, ending balance	3,777	621
Common stocks
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, beginning balance	1,408	1,559
Assets, earnings	0	0
Assets, other comprehensive income	0	0
Assets, purchases	0	0
Assets, (sales)	(170)	(151)
Assets, maturities	0	0
Assets, transfer out	0	0
Assets, ending balance	1,238	1,408
Trading Assets, Excluding Debt and Equity Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, beginning balance	928	851
Assets, earnings	(815)	(3,534)
Assets, other comprehensive income	0	3,570
Assets, purchases	824	0
Assets, (sales)	(854)	(52)
Assets, maturities	0	0
Assets, transfer out	0	93
Assets, ending balance	$ 83	$ 928

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Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2013

Fair Value Disclosures [Abstract]

Assets And Liabilities Measured At Fair value, On A Recurring Basis

The following tables present the assets and liabilities measured at fair value, on a recurring basis, as of June 30, 2013 and December 31, 2012 by Level:

(In thousands)	Total		Level 1		Level 2		Level 3
June 30, 2013
Assets:
Fixed maturity securities available for sale:
U.S. government and agency	$	844,102	$	—	$	844,102	$	—
State and municipal	4,147,252		—		4,147,252		—
Mortgage-backed securities	1,559,753		—		1,559,753		—
Corporate	3,860,862		—		3,809,941		50,921
Foreign	1,121,459		—		1,121,459		—
Total fixed maturity securities available for sale	11,533,428		—		11,482,507		50,921
Equity securities:
Common stocks	330,636		329,398		—		1,238
Preferred stocks	104,205		—		100,428		3,777
Total equity securities	434,841		329,398		100,428		5,015
Arbitrage trading account	680,713		179,841		500,789		83
Total	$	12,648,982	$	509,239	$	12,083,724	$	56,019
Liabilities:
Securities sold but not yet purchased	$	171,990	$	117,636	$	54,354	$	—
December 31, 2012
Assets:
Fixed maturity securities available for sale:
U.S. government and agency	$	898,463	$	—	$	898,463	$	—
State and municipal	4,768,519		—		4,768,519		—
Mortgage-backed securities	1,715,697		—		1,715,697		—
Corporate	3,346,719		—		3,287,654		59,065
Foreign	1,111,607		—		1,111,607		—
Total fixed maturity securities available for sale	11,841,005		—		11,781,940		59,065
Equity securities:
Common stocks	282,066		280,658		—		1,408
Preferred stocks	93,956		—		93,335		621
Total equity securities	376,022		280,658		93,335		2,029
Arbitrage trading account	329,077		233,603		94,546		928
Total	$	12,546,104	$	514,261	$	11,969,821	$	62,022
Liabilities:
Securities sold but not yet purchased	$	121,487	$	114,909	$	6,558	$	20

Summarize Changes In Level 3 Assets

The following tables summarize changes in Level 3 assets and liabilities for the six months ended June 30, 2013 and for the year ended December 31, 2012:

			Gains (Losses) Included in
(In thousands)	Beginning Balance		Earnings			Other Comprehensive Income			Purchases		(Sales)			Maturities			Transfer in		Ending Balance
Six months ended June 30, 2013:
Assets:
Fixed maturities available for sale:
Corporate	$	59,065	$	(64	)	$	(867	)	$	84	$	(2,577	)	$	(4,720	)	$	—	$	50,921
Total	59,065		(64		)	(867		)	84		(2,577		)	(4,720		)	—		50,921
Equity securities available for sale:
Common stocks	1,408		—			—			—		(170		)	—			—		1,238
Preferred stocks	621		(274		)	—			3,430		—			—			—		3,777
Total	2,029		(274		)	—			3,430		(170		)	—			—		5,015
Arbitrage trading account	928		(815		)	—			824		(854		)	—			—		83
Total	$	62,022	$	(1,153	)	$	(867	)	$	4,338	$	(3,601	)	$	(4,720	)	$	—	$	56,019
Liabilities:
Securities sold but not yet purchased	$	20	$	(4	)	$	—		$	4	$	(20	)	$	—		$	—	$	—
Year ended December 31, 2012:
Assets:
Fixed maturities available for sale:
Corporate	$	67,828	$	(1,497	)	$	9,622		$	283	$	—		$	(17,171	)	$	—	$	59,065
Total	67,828		(1,497		)	9,622			283		—			(17,171		)	—		59,065
Equity securities available for sale:
Common stocks	1,559		—			—			—		(151		)	—			—		1,408
Preferred stocks	12,303		1,126			(1,737		)	—		(11,071		)	—			—		621
Total	13,862		1,126			(1,737		)	—		(11,222		)	—			—		2,029
Arbitrage trading account	851		(3,534		)	3,570			—		(52		)	—			93		928
Total	$	82,541	$	(3,905	)	$	11,455		$	283	$	(11,274	)	$	(17,171	)	$	93	$	62,022
Liabilities:
Securities sold but not yet purchased	$	21	$	(1	)	$	—		$	—	$	—		$	—		$	—	$	20

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Real Estate Real Estate (Tables)

6 Months Ended

Jun. 30, 2013

Real Estate [Abstract]

Schedule of Real Estate Investments

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

	Carrying Value
	June 30,		December 31,
(In thousands)	2013		2012
Properties in operation	$	265,884	$	282,899
Properties under development	324,052		323,836
Total	$	589,936	$	606,735

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Loans Receivable Loans Receivable (Tables)

6 Months Ended

Jun. 30, 2013

Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]

Schedule of Loans Receivable

Loans receivable are as follows:

(In thousands)	June 30, 2013			December 31, 2012
Loans receivable	$	359,177		$	401,961
Valuation allowance:
Specific	$	—		$	3,000
General	1,844			2,620
Total	$	1,844		$	5,620
Impaired loans:
With a specific valuation allowance	$	—		$	1,775
Without a valuation allowance	30,000			31,023
Unpaid principal balance	30,000			35,872
For the six months ended June 30:	2013			2012
Increase in valuation allowance	$	65		$	6,773
Loans receivable charged off	—			85
For the three months ended June 30:
Increase (decrease) in valuation allowance	(30		)	123
Loans receivable charged off	—			—

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Statements of Comprehensive Income (Loss)

6 Months Ended

Jun. 30, 2013

Equity [Abstract]

Statement of Comprehensive Income (Loss)

Statement of Comprehensive Income (Loss)

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

	Unrealized Investment Gains				Currency Translation Adjustments			Net Pension Asset				Accumulated Other Comprehensive Income (Loss)
As of and for the six months ended June 30, 2013:
(In thousands)
Changes in AOCI
Beginning of period	$	517,658			$	(36,676	)	$	(15,351	)		$	465,631
Other comprehensive income (loss) before reclassifications	(161,945		)		(69,779		)	—				(231,724		)
Amounts reclassified from AOCI	(27,305		)		—			3,628				(23,677		)
Other comprehensive income (loss)	(189,250		)		(69,779		)	3,628				(255,401		)
Unrealized investment gain related to non-controlling interest	(5		)		—			—				(5		)
End of period	$	328,403			$	(106,455	)	$	(11,723	)		$	210,225
Amounts reclassified from AOCI
Pre-tax	$	(42,008	)	(1)	$	—		$	5,582		(2)	$	(36,426	)
Tax effect (3)	14,703				—			(1,954		)		12,749
After-tax amounts reclassified	$	(27,305	)		$	—		$	3,628			$	(23,677	)
Other comprehensive income (loss)
Pre-tax	$	(291,154	)		$	(69,779	)	$	5,582			$	(355,351	)
Tax effect	101,904				—			(1,954		)		99,950
Other comprehensive income (loss)	$	(189,250	)		$	(69,779	)	$	3,628			$	(255,401	)
As of and for the three months ended June 30, 2013:
Changes in AOCI
Beginning of period	$	525,428			$	(83,299	)	$	(13,537	)		$	428,592
Other comprehensive income (loss) before reclassifications	(182,934		)		(23,156		)	—				(206,090		)
Amounts reclassified from AOCI	(14,126		)		—			1,814				(12,312		)
Other comprehensive income (loss)	(197,060		)		(23,156		)	1,814				(218,402		)
Unrealized investment gain related to non-controlling interest	35							—				35
End of period	$	328,403			$	(106,455	)	$	(11,723	)		$	210,225
Amounts reclassified from AOCI
Pre-tax	$	(21,933	)		$	—		$	2,790			$	(19,143	)
Tax effect (3)	7,807				—			(976		)		6,831
After-tax amounts reclassified	$	(14,126	)		$	—		$	1,814			$	(12,312	)
Other comprehensive income (loss)
Pre-tax	$	(303,169	)		$	(23,156	)	$	2,790			$	(323,535	)
Tax effect	106,109				—			(976		)		105,133
Other comprehensive income (loss)	$	(197,060	)		$	(23,156	)	$	1,814			$	(218,402	)

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

(2) Other operating costs and expenses in the consolidated statements of operations.

(3) Income tax expense in the consolidated statements of operations.

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Securities in an Unrealized Loss Position (Non-Investment Grade Fixed Maturity Securities) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Aggregate fair value of securities in a continuous unrealized loss position	$ 2,971,800	$ 1,536,923
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Aggregate fair value of securities in a continuous unrealized loss position	667,212	543,023
Corporate
Schedule of Available-for-sale Securities [Line Items]
Aggregate fair value of securities in a continuous unrealized loss position	1,233,239	442,318
State and municipal
Schedule of Available-for-sale Securities [Line Items]
Aggregate fair value of securities in a continuous unrealized loss position	595,311	288,661
Foreign
Schedule of Available-for-sale Securities [Line Items]
Aggregate fair value of securities in a continuous unrealized loss position	249,199	106,833
Noninvestment Grade Investments at Loss Less than 5 Million
Schedule of Available-for-sale Securities [Line Items]
Number of securities	31
Aggregate fair value of securities in a continuous unrealized loss position	170,788
Gross Unrealized Loss	9,600
Noninvestment Grade Investments at Loss Less than 5 Million | Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Number of securities	18
Aggregate fair value of securities in a continuous unrealized loss position	106,405
Gross Unrealized Loss	5,246
Noninvestment Grade Investments at Loss Less than 5 Million | Corporate
Schedule of Available-for-sale Securities [Line Items]
Number of securities	9
Aggregate fair value of securities in a continuous unrealized loss position	26,685
Gross Unrealized Loss	4,067
Noninvestment Grade Investments at Loss Less than 5 Million | State and municipal
Schedule of Available-for-sale Securities [Line Items]
Number of securities	2
Aggregate fair value of securities in a continuous unrealized loss position	18,361
Gross Unrealized Loss	47
Noninvestment Grade Investments at Loss Less than 5 Million | Foreign
Schedule of Available-for-sale Securities [Line Items]
Number of securities	2
Aggregate fair value of securities in a continuous unrealized loss position	19,337
Gross Unrealized Loss	$ 240

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Statements of Comprehensive Income (Loss) (Tables)

6 Months Ended

Jun. 30, 2013

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):

	Unrealized Investment Gains				Currency Translation Adjustments			Net Pension Asset				Accumulated Other Comprehensive Income (Loss)
As of and for the six months ended June 30, 2013:
(In thousands)
Changes in AOCI
Beginning of period	$	517,658			$	(36,676	)	$	(15,351	)		$	465,631
Other comprehensive income (loss) before reclassifications	(161,945		)		(69,779		)	—				(231,724		)
Amounts reclassified from AOCI	(27,305		)		—			3,628				(23,677		)
Other comprehensive income (loss)	(189,250		)		(69,779		)	3,628				(255,401		)
Unrealized investment gain related to non-controlling interest	(5		)		—			—				(5		)
End of period	$	328,403			$	(106,455	)	$	(11,723	)		$	210,225
Amounts reclassified from AOCI
Pre-tax	$	(42,008	)	(1)	$	—		$	5,582		(2)	$	(36,426	)
Tax effect (3)	14,703				—			(1,954		)		12,749
After-tax amounts reclassified	$	(27,305	)		$	—		$	3,628			$	(23,677	)
Other comprehensive income (loss)
Pre-tax	$	(291,154	)		$	(69,779	)	$	5,582			$	(355,351	)
Tax effect	101,904				—			(1,954		)		99,950
Other comprehensive income (loss)	$	(189,250	)		$	(69,779	)	$	3,628			$	(255,401	)
As of and for the three months ended June 30, 2013:
Changes in AOCI
Beginning of period	$	525,428			$	(83,299	)	$	(13,537	)		$	428,592
Other comprehensive income (loss) before reclassifications	(182,934		)		(23,156		)	—				(206,090		)
Amounts reclassified from AOCI	(14,126		)		—			1,814				(12,312		)
Other comprehensive income (loss)	(197,060		)		(23,156		)	1,814				(218,402		)
Unrealized investment gain related to non-controlling interest	35							—				35
End of period	$	328,403			$	(106,455	)	$	(11,723	)		$	210,225
Amounts reclassified from AOCI
Pre-tax	$	(21,933	)		$	—		$	2,790			$	(19,143	)
Tax effect (3)	7,807				—			(976		)		6,831
After-tax amounts reclassified	$	(14,126	)		$	—		$	1,814			$	(12,312	)
Other comprehensive income (loss)
Pre-tax	$	(303,169	)		$	(23,156	)	$	2,790			$	(323,535	)
Tax effect	106,109				—			(976		)		105,133
Other comprehensive income (loss)	$	(197,060	)		$	(23,156	)	$	1,814			$	(218,402	)

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

(2) Other operating costs and expenses in the consolidated statements of operations.

(3) Income tax expense in the consolidated statements of operations.

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Restricted Stock Units (Tables)

6 Months Ended

Jun. 30, 2013

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

Summary Of Restricted Stock Units Issued

A summary of RSUs issued in the six months ended June 30,2013 and 2012 follows:

($ in thousands)	Units	Fair Value
Six months ended June 30:
2013	55,150	$	2,312
2012	99,050	$	3,633

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Arbitrage Trading Account

6 Months Ended

Jun. 30, 2013

Trading Securities [Abstract]

Arbitrage Trading Account

Arbitrage Trading Account

At June 30, 2013 and December 31, 2012, the carrying value of the arbitrage trading account was $681 million and $329 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 believes that this makes arbitrage investments less vulnerable to changes in general financial market conditions.

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Statements of Cash Flow

6 Months Ended

Jun. 30, 2013

Supplemental Cash Flow Information [Abstract]

Statements of Cash Flow

Statements of Cash Flow

Interest payments were $65,365,000 and $55,616,000 and income taxes paid were $137,618,000 and $68,118,000 in the six months ended June 30, 2013 and 2012, respectively.

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Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
CASH FROM (USED IN) OPERATING ACTIVITIES:
Net income to common stockholders	$ 232,572	$ 244,156
Adjustments to reconcile net income to net cash from operating activities:
Net investment gains	(53,027)	(71,777)
Depreciation and amortization	50,617	47,147
Noncontrolling interests	(847)	(20)
Investment funds	(33,057)	(63,243)
Stock incentive plans	12,395	15,827
Change in:
Arbitrage trading account	1,590	(1,535)
Premiums and fees receivable	(162,853)	(139,183)
Reinsurance accounts	(67,447)	(46,182)
Deferred policy acquisition costs	(34,039)	(21,637)
Income taxes	(46,642)	20,963
Reserves for losses and loss expenses	221,525	151,975
Unearned premiums	269,931	188,902
Other	(76,786)	(12,982)
Net cash from (used in) operating activities	313,932	312,411
CASH FROM (USED IN) INVESTING ACTIVITIES:
Proceeds from sale of fixed maturity securities	555,694	370,902
Proceeds from sale of equity securities	66,969	70,274
Distributions from (contributions to) investment funds	(60,000)	23,090
Proceeds from maturities and prepayments of fixed maturity securities	1,561,236	922,961
Purchase of fixed maturity securities	(2,214,201)	(1,658,418)
Purchase of equity securities	(111,540)	(184,751)
Real estate purchased	(13,390)	(15,475)
Change in loans receivable	(46,854)	(61,886)
Net additions to real estate, furniture and equipment	(43,446)	(20,376)
Change in balances due to security brokers	(6,167)	38,700
Cash distributed in connection with business disposition	(21,408)
Payment for business purchased, net of cash acquired	(38,556)	0
Net cash from (used in) investing activities	(371,663)	(514,979)
CASH FROM (USED IN) FINANCING ACTIVITIES:
Repayment of senior notes and other debt	(486,297)	0
Net proceeds from issuance of debt	371,923	364,044
Net proceeds from stock options exercised	51	4,776
Cash dividends to common stockholders	(12,243)	(11,042)
Purchase of common treasury shares	(31,362)	(48,346)
Other, net	7,273	19,500
Net cash from (used in) financing activities	(150,655)	328,932
Net impact on cash due to change in foreign exchange rates	(38,445)	(25,886)
Net change in cash and cash equivalents	(246,831)	100,478
Cash and cash equivalents at beginning of year	905,670	911,742
Cash and cash equivalents at end of period	$ 658,839	$ 1,012,220

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Investments in Equity Securities (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Cost	$ 358,624	$ 308,175
Gross Unrealized, Gains	85,961	70,205
Gross Unrealized, Losses	(9,744)	(2,358)
Carrying and fair value of equity securities	434,841	376,022
Common stocks
Schedule of Available-for-sale Securities [Line Items]
Cost	275,719	222,671
Gross Unrealized, Gains	60,277	60,102
Gross Unrealized, Losses	(5,360)	(707)
Carrying and fair value of equity securities	330,636	282,066
Preferred stocks
Schedule of Available-for-sale Securities [Line Items]
Cost	82,905	85,504
Gross Unrealized, Gains	25,684	10,103
Gross Unrealized, Losses	(4,384)	(1,651)
Carrying and fair value of equity securities	$ 104,205	$ 93,956

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Acquistions intangible (Details) (After Market Original Equipment Manufacturer, USD $) In Millions, unless otherwise specified	1 Months Ended	6 Months Ended	12 Months Ended
	Jan. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
Business Acquisition [Line Items]
Percentage acquired	51.00%		49.00%
Purchase amount	$ 43		$ 43
Acquired Indefinite-lived Intangible Assets		$ 3
Minimum
Business Acquisition [Line Items]
Amortization of Acquired Intangible Assets		2 years
Maximum
Business Acquisition [Line Items]
Amortization of Acquired Intangible Assets		15 years

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Net Investment Income (Tables)

6 Months Ended

Jun. 30, 2013

Net Investment Income [Abstract]

Schedule of Net Investment Income

Net investment income consists of the following:

	For the Three Months Ended						For the Six Months Ended
	June 30,						June 30,
(In thousands)	2013			2012			2013			2012
Investment income earned on:
Fixed maturity securities, including cash and cash equivalents and loans receivable	$	111,203		$	119,835		$	229,039		$	239,123
Investment funds	22,576			35,619			33,510			63,242
Arbitrage trading account	4,990			60			8,773			6,541
Equity securities available for sale	3,634			3,829			5,881			6,979
Real estate	3,116			3,348			6,257			5,524
Gross investment income	145,519			162,691			283,460			321,409
Investment expense	(1,782		)	(1,441		)	(3,794		)	(2,540		)
Net investment income	$	143,737		$	161,250		$	279,666		$	318,869

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Reinsurance (Reinsurance Financial Information) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Written premiums:
Written premiums, direct	$ 1,405,183,000	$ 1,249,576,000	$ 2,805,595,000	$ 2,450,595,000
Written premiums, assumed	212,753,000	181,344,000	443,962,000	381,851,000
Written premiums, ceded	(276,038,000)	(239,929,000)	(530,693,000)	(437,929,000)
Total net premiums written	1,341,898,000	1,190,991,000	2,718,864,000	2,394,517,000
Premiums Earned, Net [Abstract]
Earned premiums, direct	1,301,702,000	1,163,162,000	2,542,264,000	2,267,118,000
Earned premiums, assumed	217,517,000	186,762,000	431,533,000	366,280,000
Earned premiums, ceded	(236,704,000)	(202,567,000)	(459,163,000)	(386,390,000)
Net premiums earned	1,282,515,000	1,147,357,000	2,514,634,000	2,247,008,000
Ceded losses incurred	142,360,000	109,142,000	252,911,000	194,419,000
Uncollectible reinsurance	$ 2,000,000		$ 2,000,000		$ 2,000,000

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Realized and Unrealized Investment Gains (Losses) (Realized and Unrealized Investment Gains (Losses) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Realized And Unrealized Investment Gains (Losses)
Fixed maturity securities, gains	$ 9,147	$ 5,652	$ 20,143	$ 20,607
Fixed maturity securities, losses	(5,500)	(1,763)	(11,466)	(2,306)
Equity securities available for sale	18,086	18,188	33,331	44,426
Investment funds	10,843	2,191	11,037	3,501
Other	482	18	(18)	1,535
Realized Gain (Loss) on Investments, Including Equity Method Investments, Excluding Other than Temporary Impairments and Allowances	33,058	24,286	53,027	67,763
Decrease in valuation allowance	0	0	0	6,998
Other-than-temporary impairments	0	0	0	(2,984)
Change in valuation allowance, net of other-than-temporary impairments	0	0	0	4,014
Net investment gains	33,058	24,286	53,027	71,777
Income tax expense	(11,570)	(8,436)	(18,559)	(24,845)
Total after-tax investment gains	$ 21,488	$ 15,850	$ 34,468	$ 46,932

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Real Estate

6 Months Ended

Jun. 30, 2013

Real Estate [Abstract]

Real Estate

Real Estate

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

	Carrying Value
	June 30,		December 31,
(In thousands)	2013		2012
Properties in operation	$	265,884	$	282,899
Properties under development	324,052		323,836
Total	$	589,936	$	606,735

The primary properties in operation are an office building in London and a long-term ground lease in Washington D.C. These properties are net of accumulated depreciation and amortization of $13,027,000 and $10,354,000, as of June 30, 2013 and December 31, 2012, respectively. Related depreciation expense was $3,420,000 and $3,781,000 for the six months ended June 30, 2013 and 2012, respectively. Future minimum rental income expected on operating leases relating to real estate held for investment is $737,000 in 2013, $1,504,000 in 2014, $1,549,000 in 2015, $1,596,000 in 2016, $1,644,000 in 2017 and $329,013,000 thereafter.

The properties under development are 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.

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Investments in Equity Securities (Equity Securities [Member])

6 Months Ended

Jun. 30, 2013

Equity Securities [Member]

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

Investments in Equity Securities

Investments in Equity Securities

At June 30, 2013 and December 31, 2012, investments in equity securities were as follows:

(In thousands)	Cost		Gross Unrealized					Fair Value		Carrying Value
			Gains		Losses
June 30, 2013
Common stocks	$	275,719	$	60,277	$	(5,360	)	$	330,636	$	330,636
Preferred stocks	82,905		25,684		(4,384		)	104,205		104,205
Total	$	358,624	$	85,961	$	(9,744	)	$	434,841	$	434,841
December 31, 2012
Common stocks	$	222,671	$	60,102	$	(707	)	$	282,066	$	282,066
Preferred stocks	85,504		10,103		(1,651		)	93,956		93,956
Total	$	308,175	$	70,205	$	(2,358	)	$	376,022	$	376,022

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Restricted Stock Units (Summary of Restricted Stock Units Issued) (Details) (USD $)	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Share-Based Compensation Arrangement by Share-based Payment Award [Line Item]
Share based compensation expense	$ 11,000,000	$ 15,000,000
Restricted Stock [Member]
Share-Based Compensation Arrangement by Share-based Payment Award [Line Item]
Award vesting period	5 years
Restricted Stock Units	55,150	99,050
Restricted Stock Units, Fair Value	$ 2,312,000	$ 3,633,000

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Securities In An Unrealized Loss Position

6 Months Ended

Jun. 30, 2013

Investments, Debt and Equity Securities [Abstract]

Securities In An Unrealized Loss Position

Securities in an Unrealized Loss Position

The following table summarizes all securities in an unrealized loss position at June 30, 2013 and December 31, 2012 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
June 30, 2013
U.S. government and agency	$	109,891	$	2,131	$	—	$	—	$	109,891	$	2,131
State and municipal	528,045		14,077		67,266		3,185		595,311		17,262
Mortgage-backed securities	612,369		16,308		54,843		3,764		667,212		20,072
Corporate	1,166,097		13,102		67,142		9,911		1,233,239		23,013
Foreign	249,199		6,853		—		—		249,199		6,853
Fixed maturity securities	2,665,601		52,471		189,251		16,860		2,854,852		69,331
Common stocks	77,610		5,360		—		—		77,610		5,360
Preferred stocks	17,702		346		21,636		4,038		39,338		4,384
Equity securities	95,312		5,706		21,636		4,038		116,948		9,744
Total	$	2,760,913	$	58,177	$	210,887	$	20,898	$	2,971,800	$	79,075
December 31, 2012
U.S. government and agency	$	69,551	$	1,660	$	—	$	—	$	69,551	$	1,660
State and municipal	152,694		1,639		135,967		8,054		288,661		9,693
Mortgage-backed securities	484,731		3,629		58,292		4,571		543,023		8,200
Corporate	371,781		2,964		70,537		9,119		442,318		12,083
Foreign	95,623		996		11,210		28		106,833		1,024
Fixed maturity securities	1,174,380		10,888		276,006		21,772		1,450,386		32,660
Common stocks	46,725		707		—		—		46,725		707
Preferred stocks	—		—		39,812		1,651		39,812		1,651
Equity securities	46,725		707		39,812		1,651		86,537		2,358
Total	$	1,221,105	$	11,595	$	315,818	$	23,423	$	1,536,923	$	35,018

Fixed Maturity Securities – A summary of the Company’s non-investment grade fixed maturity securities that were in an unrealized loss position at June 30, 2013 is presented in the table below.

($ in thousands)	Number of Securities	Aggregate Fair Value		Gross Unrealized Loss
Mortgage-backed securities	18	$	106,405	$	5,246
Corporate	9	26,685		4,067
State and municipal	2	18,361		47
Foreign	2	19,337		240
Total	31	$	170,788	$	9,600

For OTTI of fixed maturity securities that management does not intend to sell or, more likely than not, would not be required to sell, the portion of the decline in value considered to be due to credit factors is recognized in earnings and the portion of the decline in value considered to be due to non-credit factors is recognized in other comprehensive income. For the six months ended June 30, 2013 and 2012, there were no changes in the portion of impairments recognized in earnings for those securities that have been impaired due to both credit factors and non-credit factors.

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 June 30, 2013, there were three preferred stocks in an unrealized loss position, with an aggregate fair value of $39 million and a gross unrealized loss of $4 million. Based upon management’s view of the underlying value of these securities, the Company does not consider these preferred stocks to be OTTI.

Common Stocks – At June 30, 2013, the Company owned six common stocks in an unrealized loss position with an aggregate fair value of $78 million and an aggregate unrealized loss of $5 million. The Company does not consider these common stocks to be OTTI.

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Loans Receivable

6 Months Ended

Jun. 30, 2013

Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]

Loans Receivable

Loans Receivable

Loans receivable are as follows:

(In thousands)	June 30, 2013			December 31, 2012
Loans receivable	$	359,177		$	401,961
Valuation allowance:
Specific	$	—		$	3,000
General	1,844			2,620
Total	$	1,844		$	5,620
Impaired loans:
With a specific valuation allowance	$	—		$	1,775
Without a valuation allowance	30,000			31,023
Unpaid principal balance	30,000			35,872
For the six months ended June 30:	2013			2012
Increase in valuation allowance	$	65		$	6,773
Loans receivable charged off	—			85
For the three months ended June 30:
Increase (decrease) in valuation allowance	(30		)	123
Loans receivable charged off	—			—

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 Company's six largest loans receivable, which have an aggregate amortized cost of $244 million and an aggregate fair value of $247 million at June 30, 2013, are secured by commercial real estate located primarily in New York City, California, Hawaii and Chicago. These loans earn interest at floating LIBOR-based interest rates and have maturities (inclusive of extension options) through August 2025.

The Company utilizes an internal risk rating system to assign a risk to each of its commercial loans. The loan rating system takes into consideration credit quality indicators including loan to value ratios, which compare the outstanding loan amount to the estimated value of the property, the borrower's financial condition and performance with respect to loan terms, the Company's position in the capital structure, and the overall leverage in the capital structure. Based on this rating system, one loan with an aggregate cost basis of $30 million was considered to be impaired at June 30, 2013. A determination was made as to the amount of loss in the event of a default and whether the loss is probable. The results of the determination were considered in connection with the valuation allowance noted above.

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Document and Entity Information	6 Months Ended
	Jun. 30, 2013	Jul. 31, 2013
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	Jun. 30, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		135,317,930

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Realized And Unrealized Investment Gains (Losses)

6 Months Ended

Jun. 30, 2013

Realized and Unrealized Investment Gains (Losses) [Abstract]

Realized and Unrealized Investment Gains (Losses)

Realized and Unrealized Investment Gains and Losses

Realized and unrealized investment gains and losses are as follows:

	For the Three Months Ended June 30,						For the Six Months Ended June 30,
(In thousands)	2013			2012			2013			2012
Realized investment gains and losses:
Fixed maturity securities:
Gains	$	9,147		$	5,652		$	20,143		$	20,607
Losses	(5,500		)	(1,763		)	(11,466		)	(2,306		)
Equity securities available for sale	18,086			18,188			33,331			44,426
Investment funds	10,843			2,191			11,037			3,501
Other	482			18			(18		)	1,535
Total	33,058			24,286			53,027			67,763
Change in valuation allowance, net other-than-temporary impairments:
Decrease in valuation allowance	—			—			—			6,998
Other-than-temporary impairments	—			—			—			(2,984		)
Total	—			—			—			4,014
Net investment gains	33,058			24,286			53,027			71,777
Income tax expense	(11,570		)	(8,436		)	(18,559		)	(24,845		)
Total after-tax investment gains	$	21,488		$	15,850		$	34,468		$	46,932

Change in unrealized investment gains and losses:
Fixed maturity securities	$	(277,791	)	$	71,138		$	(293,380	)	$	90,560
Previously impaired fixed maturity securities	(590		)	190			522			1,933
Equity securities available for sale	(16,191		)	(8,518		)	8,370			3,077
Investment funds	(5,906		)	(2,651		)	(9,174		)	(974		)
Total change in unrealized investment gains and losses	(300,478		)	60,159			(293,662		)	94,596
Income tax benefit (expense)	103,418			(20,624		)	104,412			(33,037		)
Noncontrolling interests	35			(5		)	(5		)	(28		)
Total after-tax unrealized gains and losses	$	(197,025	)	$	39,530		$	(189,255	)	$	61,531

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Securities in an Unrealized Loss Position (Securities in an Unrealized Loss Position) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Fair Value, Less than 12 Months	$ 2,760,913	$ 1,221,105
Gross Unrealized Losses, Less than 12 Months	58,177	11,595
Fair Value, 12 Months or Greater	210,887	315,818
Gross Unrealized Losses, 12 Months or Greater	20,898	23,423
Fair Value, Total	2,971,800	1,536,923
Gross Unrealized Losses, Total	79,075	35,018
U.S. government and agency
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Fair Value, Less than 12 Months	109,891	69,551
Gross Unrealized Losses, Less than 12 Months	2,131	1,660
Fair Value, 12 Months or Greater	0	0
Gross Unrealized Losses, 12 Months or Greater	0	0
Fair Value, Total	109,891	69,551
Gross Unrealized Losses, Total	2,131	1,660
State and municipal
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Fair Value, Less than 12 Months	528,045	152,694
Gross Unrealized Losses, Less than 12 Months	14,077	1,639
Fair Value, 12 Months or Greater	67,266	135,967
Gross Unrealized Losses, 12 Months or Greater	3,185	8,054
Fair Value, Total	595,311	288,661
Gross Unrealized Losses, Total	17,262	9,693
Mortgage-backed securities
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Fair Value, Less than 12 Months	612,369	484,731
Gross Unrealized Losses, Less than 12 Months	16,308	3,629
Fair Value, 12 Months or Greater	54,843	58,292
Gross Unrealized Losses, 12 Months or Greater	3,764	4,571
Fair Value, Total	667,212	543,023
Gross Unrealized Losses, Total	20,072	8,200
Corporate
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Fair Value, Less than 12 Months	1,166,097	371,781
Gross Unrealized Losses, Less than 12 Months	13,102	2,964
Fair Value, 12 Months or Greater	67,142	70,537
Gross Unrealized Losses, 12 Months or Greater	9,911	9,119
Fair Value, Total	1,233,239	442,318
Gross Unrealized Losses, Total	23,013	12,083
Foreign
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Fair Value, Less than 12 Months	249,199	95,623
Gross Unrealized Losses, Less than 12 Months	6,853	996
Fair Value, 12 Months or Greater	0	11,210
Gross Unrealized Losses, 12 Months or Greater	0	28
Fair Value, Total	249,199	106,833
Gross Unrealized Losses, Total	6,853	1,024
Debt Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Fair Value, Less than 12 Months	2,665,601	1,174,380
Gross Unrealized Losses, Less than 12 Months	52,471	10,888
Fair Value, 12 Months or Greater	189,251	276,006
Gross Unrealized Losses, 12 Months or Greater	16,860	21,772
Fair Value, Total	2,854,852	1,450,386
Gross Unrealized Losses, Total	69,331	32,660
Common stocks
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Fair Value, Less than 12 Months	77,610	46,725
Gross Unrealized Losses, Less than 12 Months	5,360	707
Fair Value, 12 Months or Greater	0	0
Gross Unrealized Losses, 12 Months or Greater	0	0
Fair Value, Total	77,610	46,725
Gross Unrealized Losses, Total	5,360	707
Preferred stocks
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Fair Value, Less than 12 Months	17,702	0
Gross Unrealized Losses, Less than 12 Months	346	0
Fair Value, 12 Months or Greater	21,636	39,812
Gross Unrealized Losses, 12 Months or Greater	4,038	1,651
Fair Value, Total	39,338	39,812
Gross Unrealized Losses, Total	4,384	1,651
Equity Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Fair Value, Less than 12 Months	95,312	46,725
Gross Unrealized Losses, Less than 12 Months	5,706	707
Fair Value, 12 Months or Greater	21,636	39,812
Gross Unrealized Losses, 12 Months or Greater	4,038	1,651
Fair Value, Total	116,948	86,537
Gross Unrealized Losses, Total	$ 9,744	$ 2,358

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Realized and Unrealized Investment Gains (Losses) (Change in Unrealized Gains (Losses) of Available For Sales Securities) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Realized and Unrealized Investment Gains Losses [Line Items]
Change in unrealized gains (losses) before income taxes and noncontrolling interests	$ (300,478)	$ 60,159	$ (293,662)	$ 94,596
Income tax benefit (expense)	103,418	(20,624)	104,412	(33,037)
Noncontrolling interests	35	(5)	(5)	(28)
Total change in unrealized gains	(197,025)	39,530	(189,255)	61,531
Debt Securities [Member]
Realized and Unrealized Investment Gains Losses [Line Items]
Change in unrealized gains (losses) before income taxes and noncontrolling interests	(277,791)	71,138	(293,380)	90,560
Debt Securities Previously Impaired [Member]
Realized and Unrealized Investment Gains Losses [Line Items]
Change in unrealized gains (losses) before income taxes and noncontrolling interests	(590)	190	522	1,933
Equity securities available for sale
Realized and Unrealized Investment Gains Losses [Line Items]
Change in unrealized gains (losses) before income taxes and noncontrolling interests	(16,191)	(8,518)	8,370	3,077
Investment funds
Realized and Unrealized Investment Gains Losses [Line Items]
Change in unrealized gains (losses) before income taxes and noncontrolling interests	$ (5,906)	$ (2,651)	$ (9,174)	$ (974)