Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 61,957	$ (29,700)	$ 15,031
Other comprehensive income (loss)
Change in net unrealized gain (loss) on investments	(13,466)	26,373	(176,181)
Change in net benefit asset plans and obligations	2,089	18,953	(8,278)
Foreign currency translation adjustment	(200)	0	0
Other comprehensive income (loss), before tax and reclassification adjustments	(11,577)	45,326	(184,459)
Income tax effect	2,388	(9,518)	38,736
Other comprehensive income (loss), after tax, before reclassification adjustments	(9,189)	35,808	(145,723)
Change in unrealized (gains) losses on investments included in net investment gains (losses)	6,791	718	1,323
Net benefit asset plans and obligations included in other underwriting expense	0	207	3,601
Total reclassification adjustments, before tax	6,791	925	4,924
Income tax effect	(1,426)	(194)	(1,034)
Total reclassification adjustments, after tax	5,365	731	3,890
Comprehensive income (loss)	$ 58,133	$ 6,839	$ (126,802)