Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenues
Net premiums earned (Note 8)	$ 240,222	$ 249,118	$ 748,304	$ 775,746
Services revenue (Note 4)	20,146	37,773	76,775	90,132
Net investment income	51,414	35,960	136,567	110,502
Net gains (losses) on investments and other financial instruments (includes net realized gains (losses) on investments of $(4,139), $14,246, $(8,454) and $18,330) (Note 6)	(16,252)	2,098	(87,578)	12,578
Other income	659	809	1,934	2,607
Total revenues	296,189	325,758	876,002	991,565
Expenses
Provision for losses	(96,964)	17,305	(294,640)	67,096
Policy acquisition costs	5,442	7,924	17,987	21,758
Cost of services	18,717	30,520	66,230	75,381
Other operating expenses	91,327	86,479	271,363	243,210
Interest expense	21,183	21,027	62,860	63,207
Amortization of other acquired intangible assets	1,023	862	2,721	2,587
Total expenses	40,728	164,117	126,521	473,239
Pretax income	255,461	161,641	749,481	518,326
Income tax provision	57,181	35,229	168,877	111,100
Net income	$ 198,280	$ 126,412	$ 580,604	$ 407,226
Net income per share
Basic net income per share (in usd per share)	$ 1.22	$ 0.68	$ 3.39	$ 2.13
Diluted net income per share (in usd per share)	$ 1.20	$ 0.67	$ 3.34	$ 2.11
Weighted-average number of common shares outstanding—basic (in shares)	162,506	186,741	171,116	191,357
Weighted-average number of common and common equivalent shares outstanding—diluted (in shares)	164,738	188,042	173,618	192,902