Condensed Consolidated Statements Of Operations And Comprehensive (Loss) Income (USD $) In Thousands, except Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
REVENUES:
Gross premiums written	$ 442,698	$ 378,445	$ 1,522,984	$ 1,376,455
Premiums ceded	(92,438)	(76,276)	(296,050)	(271,199)
Net premiums written	350,260	302,169	1,226,934	1,105,256
Change in unearned premiums	21,080	37,327	(165,411)	(88,512)
Net premiums earned	371,340	339,496	1,061,523	1,016,744
Net investment income	47,883	59,479	150,459	193,975
Net realized investment (losses) gains	(130,809)	116,930	(21,555)	289,350
Net impairment charges recognized in earnings:
Total other-than-temporary impairment charges				(168)
Portion of loss recognized in other comprehensive income, before taxes
Net impairment charges recognized in earnings				(168)
Other income	35,000		35,000	913
Total revenues	323,414	515,905	1,225,427	1,500,814
EXPENSES:
Net losses and loss expenses	205,546	126,988	745,811	547,864
Acquisition costs	39,680	41,919	120,733	120,641
General and administrative expenses	66,007	69,871	201,164	201,423
Amortization and impairment of intangible assets	767	892	2,300	2,675
Interest expense	13,748	9,533	41,235	28,592
Foreign exchange loss (gain)	2,966	(1,387)	3,708	248
Total expenses	328,714	247,816	1,114,951	901,443
(Loss) Income before income taxes	(5,300)	268,089	110,476	599,371
Income tax expense	5,672	13,569	19,028	27,152
NET (LOSS) INCOME	(10,972)	254,520	91,448	572,219
Other comprehensive (loss) income:
Unrealized gains on investments arising during the period net of applicable deferred income tax expense for the three months ended September 30, 2011: $5,476; 2010: $2,449 and nine months ended September 30, 2011: $3,051; 2010: $3,138	20	47,954	5,656	149,276
Reclassification adjustment for net realized investment gains included in net (loss) income, net of applicable income tax	(5,319)	(32,550)	(44,995)	(145,476)
Other comprehensive (loss) income:	(5,299)	15,404	(39,339)	3,800
COMPREHENSIVE (LOSS) INCOME	$ (16,271)	$ 269,924	$ 52,109	$ 576,019
PER SHARE DATA
Basic (loss) earnings per share	$ (0.29)	$ 5.59	$ 2.40	$ 11.78
Diluted (loss) earnings per share	$ (0.29)	$ 5.21	$ 2.30	$ 11.03
Weighted average common shares outstanding	38,110,368	45,544,060	38,078,116	48,580,541
Weighted average common shares and common share equivalents outstanding	38,110,368	48,839,991	39,759,780	51,887,390
Dividends paid per share	$ 0.375	$ 0.20	$ 0.375	$ 0.60