Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Premiums written—insurance:
Direct	$ 238,638	$ 269,827	$ 467,960	$ 515,294
Assumed	150	(206)	623	(10,603)
Ceded	(16,421)	(18,392)	(32,510)	(46,277)
Net premiums written	222,367	251,229	436,073	458,414
Increase in unearned premiums	(8,253)	(38,105)	(16,294)	(52,702)
Net premiums earned—insurance	214,114	213,124	419,779	405,712
Net investment income	25,737	27,615	49,966	54,488
Net gains (losses) on investments	47,219	(130,254)	111,670	(135,759)
Change in fair value of derivative instruments	57,477	86,535	107,563	(81,135)
Net (losses) gains on other financial instruments	(1,909)	1,188	(1,211)	(4,487)
Other income	1,817	2,234	2,944	4,005
Total revenues	344,455	200,442	690,711	242,824
Expenses:
Provision for losses	69,343	140,291	124,152	272,350
Change in premium deficiency reserve (“PDR”)	383	1,251	849	622
Policy acquisition costs	8,421	10,006	17,035	27,201
Other operating expenses	65,551	60,981	125,460	141,081
Interest expense	22,348	19,420	42,275	35,301
Total expenses	166,046	231,949	309,771	476,555
Equity in net (loss) income of affiliates	0	0	(13)	1
Pretax income (loss)	178,409	(31,507)	380,927	(233,730)
Income tax provision (benefit)	3,576	1,665	3,335	(13,058)
Net income (loss)	$ 174,833	$ (33,172)	$ 377,592	$ (220,672)
Basic net income (loss) per share	$ 0.96	$ (0.19)	$ 2.12	$ (1.40)
Diluted net income (loss) per share	$ 0.78	$ (0.19)	$ 1.71	$ (1.40)
Weighted-average number of common shares outstanding—basic	182,583	171,783	177,903	158,180
Weighted-average number of common and common equivalent shares outstanding—diluted	230,779	171,783	226,767	158,180
Dividends per share	$ 0.0025	$ 0.0025	$ 0.0050	$ 0.0050