Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Revenues
Net premiums earned (Note 8)	$ 233,238	$ 254,190
Services revenue (Note 4)	10,984	29,348
Net investment income	59,221	38,196
Net gains (losses) on investments and other financial instruments (includes net realized gains (losses) on investments of $(5,505) and $(323)) (Note 6)	5,585	(29,457)
Other income	1,592	703
Total revenues	310,620	292,980
Expenses
Provision for losses	(16,929)	(83,754)
Policy acquisition costs	6,293	6,605
Cost of services	10,398	24,753
Other operating expenses	83,269	89,541
Interest expense	22,207	20,846
Amortization of other acquired intangible assets	1,371	849
Total expenses	106,609	58,840
Pretax income	204,011	234,140
Income tax provision	46,254	53,009
Net income	$ 157,757	$ 181,131
Net income per share
Basic net income per share (in usd per share)	$ 1.00	$ 1.02
Diluted net income per share (in usd per share)	$ 0.98	$ 1.01
Weighted-average number of common shares outstanding—basic (in shares)	158,304	176,816
Weighted-average number of common and common equivalent shares outstanding—diluted (in shares)	161,349	179,079