Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Premiums written—insurance:
Direct	$ 203,753	$ 190,841
Assumed	(87,488)	1,624
Ceded	(38,587)	(9,716)
Net premiums written	77,678	182,749
Decrease in unearned premiums	89,687	20,274
Net premiums earned—insurance	167,365	203,023
Net investment income	34,713	42,240
Net gains on investments	67,459	37,435
Total other-than-temporary impairment ('OTTI') losses	0	0
Losses recognized in other comprehensive income (loss)	0	0
Net impairment losses recognized in earnings	0	0
Change in fair value of derivative instruments	(72,757)	243,892
Net (losses) gains on other financial instruments	(17,852)	75,251
Other income	1,440	1,448
Total revenues	180,368	603,289
Expenses:
Provision for losses	266,154	427,373
Change in reserve for premium deficiency	(20)	(1,383)
Policy acquisition costs	28,046	14,131
Other operating expenses	50,154	46,219
Interest expense	14,148	17,024
Total expenses	358,482	503,364
Equity in net (loss) income of affiliates	(11)	65
Pretax (loss) income	(178,125)	99,990
Income tax benefit	(8,893)	(3,016)
Net (loss) income	$ (169,232)	$ 103,006
Basic net (loss) income per share	$ (1.28)	$ 0.78
Diluted net (loss) income per share	$ (1.28)	$ 0.77
Weighted-average number of common shares outstanding—basic	132,465	132,427
Weighted-average number of common and common equivalent shares outstanding—diluted	132,465	133,703
Dividends per share	$ 0.0025	$ 0.0025