Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues:
Net premiums earned—insurance	$ 242,550	$ 221,800
Services revenue	33,164	38,027
Net investment income	33,956	31,032
Net gains (losses) on investments and other financial instruments	(18,887)	(2,851)
Other income	807	746
Total revenues	291,590	288,754
Expenses:
Provision for losses	37,283	46,913
Policy acquisition costs	7,117	6,729
Cost of services	23,126	28,375
Other operating expenses	63,243	68,377
Restructuring and other exit costs (Note 1)	551	0
Interest expense	15,080	15,938
Loss on induced conversion and debt extinguishment	0	4,456
Amortization and impairment of other intangible assets	2,748	3,296
Total expenses	149,148	174,084
Pretax income	142,442	114,670
Income tax provision	27,956	38,198
Net income	$ 114,486	$ 76,472
Earnings Per Share, Basic [Abstract]
Basic net income (loss) per share	$ 0.53	$ 0.36
Earnings Per Share, Diluted [Abstract]
Diluted net income (loss) per share	$ 0.52	$ 0.34
Weighted-average number of common shares outstanding—basic	215,967	214,925
Weighted-average number of common and common equivalent shares outstanding—diluted	219,883	221,497
Dividends per share	$ 0.0025	$ 0.0025
Net impairment losses recognized in earnings	$ 844