Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended			6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019		Jun. 30, 2020	Jun. 30, 2019
Revenues:
Net premiums earned (Note 7)		$ 249,295	$ 299,166	[1]	$ 526,710	$ 562,678	[1]
Services revenue (Note 3)		28,075	39,303		60,002	72,056
Net investment income		38,723	43,761		79,667	87,608
Net gains (losses) on investments and other financial instruments		47,276	12,540		25,249	34,453
Other income		1,072	194		1,894	1,798
Total revenues		364,441	394,964		693,522	758,593
Expenses:
Provision for losses		304,418	47,427		340,369	68,181
Policy acquisition costs		6,015	6,203		13,428	12,096
Cost of services		17,972	27,845		40,113	52,002
Other operating expenses		60,582	70,046		129,692	148,851
Interest expense		16,699	14,961		28,893	30,658
Loss on extinguishment of debt		0	16,798		0	16,798
Amortization and impairment of other acquired intangible assets		979	2,139		1,958	4,326
Total expenses		406,665	185,419		554,453	332,912
Consolidated pretax income (loss)		(42,224)	209,545		139,069	425,681
Income tax provision (benefit)		(12,273)	42,815		28,559	87,994
Net income (loss)		$ (29,951)	$ 166,730		$ 110,510	$ 337,687
Earnings Per Share, Basic [Abstract]
Basic net income (loss) per share		$ (0.15)	$ 0.80		$ 0.56	$ 1.60
Earnings Per Share, Diluted [Abstract]
Diluted net income (loss) per share		$ (0.15)	$ 0.78		$ 0.56	$ 1.56
Weighted-average number of common shares outstanding—basic	[2]	193,299	208,097		197,545	211,264
Weighted-average number of common and common equivalent shares outstanding—diluted		193,299	213,603		198,746	216,500

[1] Includes a cumulative adjustment to unearned premiums recorded in the second quarter of 2019 related to an update to the amortization rates used to recognize revenue for Single Premium Policies. See Note 3 for further information.

[2] Includes the impact of fully vested shares under our share-based compensation programs.