Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenues
Net premiums earned (Note 8)	$ 213,429	$ 253,892	$ 446,667	$ 508,082
Services revenue (Note 4)	11,797	27,281	22,781	56,629
Net investment income	64,182	46,957	123,403	85,153
Net gains (losses) on investments and other financial instruments (includes net realized gains (losses) on investments of $(3,351), $(3,992), $(8,856) and $(4,315)) (Note 6)	(236)	(41,869)	5,349	(71,326)
Other income	1,241	572	2,833	1,275
Total revenues	290,413	286,833	601,033	579,813
Expenses
Provision for losses	(21,632)	(113,922)	(38,561)	(197,676)
Policy acquisition costs	5,218	5,940	11,511	12,545
Cost of services	10,257	22,760	20,655	47,513
Other operating expenses	89,885	90,495	173,154	180,036
Interest expense	22,639	20,831	44,846	41,677
Amortization of other acquired intangible assets	1,370	849	2,741	1,698
Total expenses	107,737	26,953	214,346	85,793
Pretax income	182,676	259,880	386,687	494,020
Income tax provision	36,589	58,687	82,843	111,696
Net income	$ 146,087	$ 201,193	$ 303,844	$ 382,324
Net income per share
Basic net income per share (in usd per share)	$ 0.92	$ 1.16	$ 1.91	$ 2.18
Diluted net income per share (in usd per share)	$ 0.91	$ 1.15	$ 1.89	$ 2.16
Weighted average number of common shares outstanding—basic (in shares)	159,010	173,705	159,250	175,491
Weighted average number of common and common equivalent shares outstanding—diluted (in shares)	160,744	175,419	161,129	177,349