Condensed Consolidated Statements of Earnings and Comprehensive Earnings - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Statement [Abstract]
Net premiums earned	$ 282,810	$ 241,000	$ 551,962	$ 469,595
Net investment income	18,472	16,661	36,355	33,085
Net realized gains	12,804	36,463	18,392	50,613
Net unrealized gains (losses) on equity securities	(100,994)	3,956	(128,804)	32,118
Consolidated revenue	213,092	298,080	477,905	585,411
Losses and settlement expenses	117,914	107,026	223,438	211,918
Policy acquisition costs	89,615	77,235	174,902	152,225
Insurance operating expenses	19,325	20,148	38,188	38,944
Interest expense on debt	2,011	1,904	4,021	3,805
General corporate expenses	2,435	3,686	5,798	7,028
Total expenses	231,300	209,999	446,347	413,920
Equity in earnings of unconsolidated investees	11,654	13,940	20,413	20,364
Earnings (loss) before income taxes	(6,554)	102,021	51,971	191,855
Income tax expense (benefit)	(4,315)	20,206	6,287	37,028
Net earnings (loss)	(2,239)	81,815	45,684	154,827
Other comprehensive earnings (loss), net of tax	(97,563)	15,177	(213,144)	(29,570)
Comprehensive earnings (loss)	$ (99,802)	$ 96,992	$ (167,460)	$ 125,257
Basic net earnings (loss) per share	$ (0.05)	$ 1.81	$ 1.01	$ 3.43
Diluted net earnings (loss) per share	$ (0.05)	$ 1.79	$ 1.00	$ 3.39
Weighted average number of common shares outstanding:
Basic	45,354	45,226	45,330	45,202
Diluted	45,354	45,715	45,748	45,703