Segment Information (Tables)

12 Months Ended

Dec. 31, 2011

Segment Information [Abstract]

Summary Of Segment Results

2011	U.S. Insurance			International Insurance			Reinsurance			Total
Gross premiums written	$	838,567		$	530,450		$	570,504		$	1,939,521
Net premiums written		639,196			325,094			569,476			1,533,766
Net premiums earned		584,303			317,006			555,683			1,456,992
Net losses and loss expenses		(387,099	)		(206,593	)		(365,464	)		(959,156	)
Acquisition costs		(74,976	)		2,781			(95,100	)		(167,295	)
General and administrative expenses		(124,434	)		(84,290	)		(62,932	)		(271,656	)
Underwriting (loss) income		(2,206	)		28,904			32,187			58,885
Net investment income											195,948
Net realized investment gains											10,077
Other income - termination fee											101,744
Net impairment charges recognized in earnings											—
Amortization and impairment of intangible assets											(2,978	)
Interest expense											(54,989	)
Foreign exchange loss											(3,159	)
Income before income taxes										$	305,528
Loss and loss expense ratio		66.2	%		65.2	%		65.8	%		65.8	%
Acquisition cost ratio		12.8	%		(0.9	)%		17.1	%		11.5	%
General and administrative expense ratio		21.3	%		26.6	%		11.3	%		18.6	%
Combined ratio		100.3	%		90.9	%		94.2	%		95.9	%
2010	U.S. Insurance			International Insurance			Reinsurance			Total
Gross premiums written	$	729,267		$	504,937		$	524,193		$	1,758,397
Net premiums written		551,063			319,083			522,309			1,392,455
Net premiums earned		518,444			338,791			502,313			1,359,548
Other income		913			—			—			913
Net losses and loss expenses		(297,517	)		(160,153	)		(250,213	)		(707,883	)
Acquisition costs		(67,797	)		460			(92,152	)		(159,489	)
General and administrative expenses		(128,556	)		(94,226	)		(63,775	)		(286,557	)
Underwriting income		25,487			84,872			96,173			206,532
Net investment income											244,143
Net realized investment gains											285,612
Net impairment charges recognized in earnings											(168	)
Amortization and impairment of intangible assets											(3,483	)
Interest expense											(40,242	)
Foreign exchange loss											(444	)
Income before income taxes										$	691,950
Loss and loss expense ratio		57.4	%		47.3	%		49.8	%		52.1	%
Acquisition cost ratio		13.1	%		(0.1	)%		18.3	%		11.7	%
General and administrative expense ratio		24.8	%		27.8	%		12.7	%		21.1	%
Combined ratio		95.3	%		75.0	%		80.8	%		84.9	%

2009	U.S. Insurance			International Insurance			Reinsurance			Total
Gross premiums written	$	674,826		$	555,944		$	465,575		$	1,696,345
Net premiums written		493,067			362,893			465,165			1,321,125
Net premiums earned		447,491			413,170			456,231			1,316,892
Other income		1,506			—			—			1,506
Net losses and loss expenses		(211,363	)		(158,062	)		(234,635	)		(604,060	)
Acquisition costs		(58,114	)		(2,742	)		(87,991	)		(148,847	)
General and administrative expenses		(115,797	)		(84,390	)		(48,405	)		(248,592	)
Underwriting income		63,723			167,976			85,200			316,899
Net investment income											300,675
Net realized investment gains											126,352
Net impairment charges recognized in earnings											(49,577	)
Amortization and impairment of intangible assets											(11,051	)
Interest expense											(39,019	)
Foreign exchange loss											(748	)
Income before income taxes										$	643,531
Loss and loss expense ratio		47.2	%		38.3	%		51.4	%		45.9	%
Acquisition cost ratio		13.0	%		0.7	%		19.3	%		11.3	%
General and administrative expense ratio		25.9	%		20.4	%		10.6	%		18.9	%
Combined ratio		86.1	%		59.4	%		81.3	%		76.1	%

Net Premiums Written By Geographic Location

	2011		2010		2009
United States	$	880,073	$	815,284	$	748,111
Bermuda		418,560		411,685		433,419
Europe		155,317		139,902		134,253
Hong Kong		11,696		8,553		5,342
Singapore		68,120		17,031		—
Total net premiums written	$	1,533,766	$	1,392,455	$	1,321,125