Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net	$ 1,420		$ 526		$ 0
Revenues:
Net premiums earned—insurance	932,773		921,769		915,908
Services revenue	155,103		168,894		157,216
Net investment income	127,248		113,466		81,537
Net gains on investments and other financial instruments	3,621		30,751		35,693
Other income	2,886		3,572		2,899
Total revenues	1,221,631		1,238,452		1,193,253
Expenses:
Provision for losses	135,154		202,788		198,585
Policy acquisition costs	24,277		23,480		22,424
Cost of services	104,599		114,174		93,715
Other operating expenses	267,321		244,896		242,405
Restructuring and other exit costs (Note 1)	17,268		0		0
Interest expense	62,761		81,132		91,102
Loss on induced conversion and debt extinguishment (Note 12)	51,469		75,075		94,207
Impairment of goodwill (Note 7)	184,374		0		0
Amortization and impairment of other intangible assets	27,671		13,221		12,986
Total expenses	874,894		754,766		755,424
Pretax income from continuing operations	346,737		483,686		437,829
Income tax provision	225,649		175,433		156,290
Net income from continuing operations	121,088		308,253		281,539
Income (loss) from discontinued operations, net of tax	0		0		5,385
Net income	$ 121,088		$ 308,253		$ 286,924
Earnings Per Share, Basic:
Net income (loss) from continuing operations, per basic share	$ 0.56		$ 1.46		$ 1.41
Net income (loss) from discontinued operations, per basic share	0.00		0.00		0.03
Net income (loss), per basic share	0.56		1.46		1.44
Earnings Per Share, Diluted:
Net income (loss) from continuing operations, per diluted share	0.55		1.37		1.20
Net income (loss) from discontinued operations and disposal of discontinued operations, net of tax, per diluted share	0.00		0.00		0.02
Net income (loss) per diluted share	$ 0.55	[1]	$ 1.37	[1]	$ 1.22
Weighted-average number of common shares outstanding—basic	215,321		211,789		199,910
Weighted-average number of common and common equivalent shares outstanding—diluted	220,406		229,258		246,332
Dividends per share	$ 0.01		$ 0.01		$ 0.01

[1] Diluted net income per share is computed independently for each period presented. Consequently, the sum of the quarters may not equal the total net income per share for the year. For all calculations, the determination of whether potential common shares are dilutive or anti-dilutive is based on net income.