Condensed Consolidated Statements of Earnings and Comprehensive Earnings - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Income Statement [Abstract]
Net premiums earned	$ 389,489	$ 318,409	$ 1,129,230	$ 948,412
Net investment income	36,694	31,963	103,502	87,835
Net realized gains	5,420	6,558	11,222	26,758
Net unrealized gains (losses) on equity securities	38,392	(25,236)	87,314	15,474
Consolidated revenue	469,995	331,694	1,331,268	1,078,479
Losses and settlement expenses	202,118	189,558	513,741	457,989
Policy acquisition costs	117,811	103,013	342,186	307,083
Insurance operating expenses	28,868	21,591	84,892	70,002
Interest expense on debt	1,617	1,873	4,839	5,928
General corporate expenses	3,994	2,372	13,144	10,805
Total expenses	354,408	318,407	958,802	851,807
Equity in earnings of unconsolidated investees	1,238	1,732	7,653	7,169
Earnings (loss) before income taxes	116,825	15,019	380,119	233,841
Income tax expense	21,798	1,483	75,200	43,842
Net earnings (loss)	95,027	13,536	304,919	189,999
Other comprehensive earnings (loss), net of tax	80,293	(56,834)	59,779	(38,848)
Comprehensive earnings (loss)	$ 175,320	$ (43,298)	$ 364,698	$ 151,151
Basic net earnings per share	$ 2.08	$ 0.30	$ 6.67	$ 4.17
Diluted net earnings per share	$ 2.06	$ 0.29	$ 6.60	$ 4.12
Weighted average number of common shares outstanding:
Basic	45,780	45,622	45,734	45,581
Diluted	46,220	46,065	46,185	46,067