Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Revenues
Net premiums earned (Note 8)	$ 254,190	$ 271,872
Services revenue (Note 4)	29,348	22,895
Net investment income	38,196	38,251
Net gains (losses) on investments and other financial instruments (includes net realized gains (losses) on investments of $(323) and $(182))	(29,457)	(5,181)
Other income	703	976
Total revenues	292,980	328,813
Expenses
Provision for losses	(83,754)	46,143
Policy acquisition costs	6,605	8,996
Cost of services	24,753	20,246
Other operating expenses	89,541	70,262
Interest expense	20,846	21,115
Amortization of other acquired intangible assets	849	862
Total expenses	58,840	167,624
Pretax income	234,140	161,189
Income tax provision	53,009	35,581
Net income	$ 181,131	$ 125,608
Net Income Per Share
Basic net income per share (in usd per share)	$ 1.02	$ 0.65
Diluted net income per share (in usd per share)	$ 1.01	$ 0.64
Weighted-average number of common shares outstanding—basic (in shares)	176,816	193,439
Weighted-average number of common and common equivalent shares outstanding—diluted (in shares)	179,079	195,203