Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenues
Net premiums earned (Note 8)	$ 951,283	$ 919,578	$ 981,131
Services revenue (Note 4)	50,270	46,092	92,216
Net investment income (Note 6)	292,693	258,430	195,658
Net gains (losses) on investments and other financial instruments (includes net realized gains (losses) on investments of $(10,510), $(10,733) and $(8,306)) (Note 6)	(10,114)	10,241	(80,733)
Income (loss) on consolidated VIEs (Note 7)	(2)	0	0
Other income	6,153	6,247	2,454
Total revenues	1,290,283	1,240,588	1,190,726
Expenses
Provision for losses (Note 11)	(2,514)	(42,526)	(338,239)
Policy acquisition costs	27,316	24,578	23,918
Cost of services	38,271	38,491	82,358
Other operating expenses	347,906	347,578	381,148
Interest expense (Note 12)	108,014	89,695	84,454
Impairment of goodwill	0	9,802	0
Amortization of other acquired intangible assets	0	5,483	4,308
Total expenses	518,993	473,101	237,947
Pretax income	771,290	767,487	952,779
Income tax provision	166,850	164,368	209,845
Net Income (Loss)	$ 604,440	$ 603,119	$ 742,934
Net income per share
Basic (in usd per share)	$ 3.96	$ 3.81	$ 4.42
Diluted (in usd per share)	$ 3.92	$ 3.77	$ 4.35
Weighted average number of common shares outstanding-basic (in shares)	152,465	158,140	167,930
Weighted average number of common and common equivalent shares outstanding-diluted (in shares)	154,191	160,133	170,664