Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Revenues:
Net premiums earned—insurance	$ 221,800	$ 220,950
Services revenue	38,027	32,849
Net investment income	31,032	27,201
Net gains (losses) on investments and other financial instruments	(2,851)	31,286
Other income	746	666
Total revenues	288,754	312,952
Expenses:
Provision for losses	46,913	42,991
Policy acquisition costs	6,729	6,389
Cost of services	28,375	23,550
Other operating expenses	68,377	57,188
Interest expense	15,938	21,534
Loss on induced conversion and debt extinguishment (Note 11)	4,456	55,570
Amortization and impairment of intangible assets	3,296	3,328
Total expenses	174,084	210,550
Pretax income	114,670	102,402
Income tax provision	38,198	36,153
Net income	$ 76,472	$ 66,249
Earnings Per Share, Basic [Abstract]
Basic net income per share	$ 0.36	$ 0.33
Earnings Per Share, Diluted [Abstract]
Diluted net income per share	$ 0.34	$ 0.29
Weighted-average number of common shares outstanding—basic	214,925	203,706
Weighted-average number of common and common equivalent shares outstanding—diluted	221,497	239,707
Dividends per share	$ 0.0025	$ 0.0025