Condensed Consolidated Statements of Earnings and Comprehensive Earnings - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income Statement [Abstract]
Net premiums earned	$ 291,468	$ 253,389	$ 843,430	$ 722,984
Net investment income	21,270	17,844	57,625	50,929
Net realized gains	573,170	1,829	591,562	52,442
Net unrealized gains (losses) on equity securities	(26,414)	(2,592)	(155,218)	29,526
Consolidated revenue	859,494	270,470	1,337,399	855,881
Losses and settlement expenses	165,089	143,656	388,527	355,574
Policy acquisition costs	96,977	80,449	271,879	232,674
Insurance operating expenses	20,606	15,560	58,794	54,504
Interest expense on debt	2,013	1,906	6,034	5,711
General corporate expenses	2,755	2,505	8,553	9,533
Total expenses	287,440	244,076	733,787	657,996
Equity in earnings (loss) of unconsolidated investees	(17,352)	9,043	3,061	29,407
Earnings (loss) before income taxes	554,702	35,437	606,673	227,292
Income tax expense	114,809	6,194	121,096	43,222
Net earnings (loss)	439,893	29,243	485,577	184,070
Other comprehensive earnings (loss), net of tax	(81,248)	(12,240)	(294,392)	(41,810)
Comprehensive earnings	$ 358,645	$ 17,003	$ 191,185	$ 142,260
Basic net earnings per share	$ 9.69	$ 0.65	$ 10.71	$ 4.07
Diluted net earnings per share	$ 9.61	$ 0.64	$ 10.61	$ 4.03
Weighted average number of common shares outstanding:
Basic	45,379	45,243	45,347	45,216
Diluted	45,775	45,689	45,775	45,714