Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenues:
Net premiums earned—insurance	$ 238,149	$ 227,433	$ 688,184	$ 689,465
Services revenue	43,096	42,189	112,990	116,322
Net investment income	28,430	22,091	84,470	58,704
Net gains (losses) on investments and other financial instruments	7,711	3,868	69,524	49,095
Other income	3,497	1,711	8,835	4,785
Total revenues	320,883	297,292	964,003	918,371
Expenses:
Provision for losses	55,785	64,192	148,501	141,780
Policy acquisition costs	6,119	2,880	17,901	17,593
Direct cost of services	26,704	24,949	73,311	67,722
Other operating expenses	64,862	65,082	189,531	186,587
Interest expense	19,783	21,220	63,863	70,106
Loss on induced conversion and debt extinguishment (Note 11)	17,397	11	75,075	91,887
Amortization and impairment of intangible assets	3,292	3,273	9,931	9,577
Total expenses	193,942	181,607	578,113	585,252
Pretax income from continuing operations	126,941	115,685	385,890	333,119
Income tax provision	44,138	45,594	138,726	126,108
Net income from continuing operations	82,803	70,091	247,164	207,011
Income (loss) from discontinued operations, net of tax	0	0	0	5,385
Net income	$ 82,803	$ 70,091	$ 247,164	$ 212,396
Earnings Per Share, Basic [Abstract]
Net income from continuing operations, per basic share	$ 0.39	$ 0.34	$ 1.17	$ 1.05
Income from discontinued operations and disposal of discontinued operations, net of tax, per basic share	0.00	0.00	0.00	0.03
Basic net income per share	0.39	0.34	1.17	1.08
Earnings Per Share, Diluted [Abstract]
Net income from continuing operations, per diluted share	0.37	0.29	1.09	0.88
Income from discontinued operations and disposal of discontinued operations, net of tax, per diluted share	0.00	0.00	0.00	0.02
Diluted net income per share	$ 0.37	$ 0.29	$ 1.09	$ 0.90
Weighted-average number of common shares outstanding—basic	214,387	207,938	210,858	197,562
Weighted-average number of common and common equivalent shares outstanding—diluted	225,968	250,795	230,672	246,993
Dividends per share	$ 0.0025	$ 0.0025	$ 0.0075	$ 0.0075