Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Revenues:
Net premiums earned—insurance	$ 1,014,007		$ 932,773		$ 921,769
Services revenue	144,972		155,103		168,894
Net investment income	152,475		127,248		113,466
Net gains (losses) on investments and other financial instruments	(42,476)		3,621		30,751
Other income	4,028		2,886		3,572
Total revenues	1,273,006		1,221,631		1,238,452
Expenses:
Provision for losses	104,641		135,154		202,788
Policy acquisition costs	25,265		24,277		23,480
Cost of services	98,124		104,599		114,174
Other operating expenses	280,818		267,321		244,896
Restructuring and other exit costs (Note 1)	6,053		17,268		0
Interest expense	61,490		62,761		81,132
Loss on induced conversion and debt extinguishment (Note 12)	0		51,469		75,075
Impairment of goodwill (Note 7)	0		184,374		0
Amortization and impairment of other acquired intangible assets	12,429		27,671		13,221
Total expenses	588,820		874,894		754,766
Pretax income	684,186		346,737		483,686
Income tax provision	78,175		225,649		175,433
Net income	$ 606,011		$ 121,088		$ 308,253
Earnings Per Share, Basic:
Net income (loss), per basic share	$ 2.83		$ 0.56		$ 1.46
Earnings Per Share, Diluted:
Net income (loss) per diluted share	$ 2.77	[1]	$ 0.55	[1]	$ 1.37
Weighted-average number of common shares outstanding—basic	214,267		215,321		211,789
Weighted-average number of common and common equivalent shares outstanding—diluted	218,553		220,406		229,258

[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.