Consolidated Statements of Operations (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Revenues
Net earned premiums	$ 211,073	$ 288,767	$ 695,118	$ 900,437
Net investment income	93,534	85,615	290,748	260,788
Net realized investment gains (losses):
Other-than-temporary impairment losses	(33,494)	(5,719)	(67,259)	(24,248)
Less: portion of other-than-temporary impairment loss recognized in other comprehensive income	(17,061)	(1,189)	(34,670)	(1,850)
Other net realized investment gains (losses)	5,348	2,156	19,220	20,999
Net realized investment gains (losses)	(11,085)	(2,374)	(13,369)	(1,399)
Net change in fair value of credit derivatives:
Realized gains and other settlements	483	52,498	25,074	117,554
Net unrealized gains (losses)	1,155,531	(276,427)	829,836	10,786
Net change in fair value of credit derivatives	1,156,014	(223,929)	854,910	128,340
Fair value gain (loss) on committed capital securities	2,443	(5,548)	3,538	5,770
Net change in fair value of financial guaranty variable interest entities	(99,230)	171,258	(153,915)	134,953
Other income (loss)	(7,550)	33,682	63,376	7,357
Total revenues	1,345,199	347,471	1,740,406	1,436,246
Expenses
Loss and loss adjustment expenses	214,991	110,772	313,324	307,394
Amortization of deferred acquisition costs	7,278	8,023	24,231	23,132
Assured Guaranty Municipal Holdings Inc. acquisition-related expenses				6,772
Interest expense	24,968	24,886	74,424	74,851
Other operating expenses	41,896	52,139	147,239	162,179
Total expenses	289,133	195,820	559,218	574,328
Income (loss) before income taxes	1,056,066	151,651	1,181,188	861,918
Provision (benefit) for income taxes
Current	(12,386)	(191,867)	(200,121)	(185,998)
Deferred	307,299	178,919	522,080	370,722
Total provision (benefit) for income taxes	294,913	(12,948)	321,959	184,724
Net income (loss)	$ 761,153	$ 164,599	$ 859,229	$ 677,194
Earnings per share:
Basic (in dollars per share)	$ 4.15	$ 0.89	$ 4.67	$ 3.67
Diluted (in dollars per share)	$ 4.13	$ 0.88	$ 4.61	$ 3.58
Dividends per share (in dollars per share)	$ 0.045	$ 0.045	$ 0.135	$ 0.135