Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues:
Net premiums earned—insurance	$ 236,702	$ 238,149	$ 687,598	$ 688,184
Services revenue	39,571	45,877	115,400	118,989
Net investment income	32,540	28,430	93,643	84,470
Net gains (losses) on investments and other financial instruments	2,480	7,711	4,960	69,524
Other income	760	716	2,118	2,836
Total revenues	312,053	320,883	903,719	964,003
Expenses:
Provision for losses	35,841	55,785	99,976	148,501
Policy acquisition costs	5,554	6,119	18,406	17,901
Cost of services	27,240	29,447	81,250	80,362
Other operating expenses	64,195	62,119	201,322	182,480
Restructuring and other exit costs (Note 1)	12,038	0	12,038	0
Interest expense	15,715	19,783	47,832	63,863
Loss on induced conversion and debt extinguishment (Note 11)	45,766	17,397	51,469	75,075
Impairment of goodwill (Note 6)	0	0	184,374	0
Amortization and impairment of other intangible assets	2,890	3,292	25,042	9,931
Total expenses	209,239	193,942	721,709	578,113
Pretax income	102,814	126,941	182,010	385,890
Income tax provision	37,672	44,138	67,738	138,726
Net income	$ 65,142	$ 82,803	$ 114,272	$ 247,164
Earnings Per Share, Basic [Abstract]
Basic net income (loss) per share	$ 0.30	$ 0.39	$ 0.53	$ 1.17
Earnings Per Share, Diluted [Abstract]
Diluted net income (loss) per share	$ 0.30	$ 0.37	$ 0.52	$ 1.09
Weighted-average number of common shares outstanding—basic	215,279	214,387	215,194	210,858
Weighted-average number of common and common equivalent shares outstanding—diluted	219,391	225,968	220,230	230,672
Dividends per share	$ 0.0025	$ 0.0025	$ 0.0075	$ 0.0075