Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Premiums written—insurance:
Direct	$ 174,008	$ 194,757	$ 364,849	$ 379,035
Assumed	(11,788)	(7,923)	(10,164)	(9,171)
Ceded	(9,442)	(26,933)	(19,158)	(54,462)
Net premiums written	152,778	159,901	335,527	315,402
Decrease in unearned premiums	36,156	43,545	56,430	86,312
Net premiums earned—insurance	188,934	203,446	391,957	401,714
Net investment income	43,823	48,619	86,063	93,977
Net gains on investments	44,236	57,262	81,671	115,210
Total other-than-temporary impairment ('OTTI') losses	(11)	(38)	(11)	(56)
Losses recognized in other comprehensive income (loss)	0	0	0	0
Net impairment losses recognized in earnings	(11)	(38)	(11)	(56)
Change in fair value of derivative instruments	188,726	(524,606)	432,618	(602,560)
Net gains (losses) on other financial instruments	5,047	(63,200)	80,298	(164,764)
Gain on sale of affiliate	0	34,815	0	34,815
Other income	1,196	(2,072)	2,644	3,703
Total revenues	471,951	(245,774)	1,075,240	(117,961)
Expenses:
Provision for losses	263,566	435,166	690,939	979,046
Change in reserve for premium deficiency	(3,102)	(7,354)	(4,485)	(8,585)
Policy acquisition costs	14,387	16,797	28,518	31,665
Other operating expenses	45,954	35,165	92,173	100,221
Interest expense	16,079	8,245	33,103	19,049
Total expenses	336,884	488,019	840,248	1,121,396
Equity in net income of affiliates	0	6,570	65	14,668
Pretax income (loss)	135,067	(727,223)	235,057	(1,224,689)
Income tax benefit	(2,048)	(252,143)	(5,064)	(439,254)
Net income (loss)	$ 137,115	$ (475,080)	$ 240,121	$ (785,435)
Basic net income (loss) per share	$ 1.04	$ (4.31)	$ 1.82	$ (8.15)
Diluted net income (loss) per share	$ 1.03	$ (4.31)	$ 1.80	$ (8.15)
Weighted-average number of common shares outstanding—basic	132,185	110,282	132,185	96,420
Weighted-average number of common and common equivalent shares outstanding—diluted	133,614	110,282	133,724	96,420
Dividends per share	$ 0.0025	$ 0.0025	$ 0.0050	$ 0.0050