Investments - Schedule of Investments, Available-for-Sale Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	$ 670,922	$ 687,813
Gross Unrealized Gains	5,362	9,124
Gross Unrealized Losses	(3,184)	(666)
Estimated Fair Value	673,100	696,271
Corporate
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	294,279	262,302
Gross Unrealized Gains	2,101	3,982
Gross Unrealized Losses	(1,387)	(116)
Estimated Fair Value	294,993	266,168
U.S. Treasury
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	117,690	181,077
Gross Unrealized Gains	151	701
Gross Unrealized Losses	(710)	(161)
Estimated Fair Value	117,131	181,617
States and municipalities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	37,738	29,182
Gross Unrealized Gains	740	967
Gross Unrealized Losses	(126)	(3)
Estimated Fair Value	38,352	30,146
Foreign
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	32,656	33,000
Gross Unrealized Gains	26	54
Gross Unrealized Losses	(146)	(62)
Estimated Fair Value	32,536	32,992
Asset-backed securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	33,362	31,899
Gross Unrealized Gains	418	394
Gross Unrealized Losses	(47)	(42)
Estimated Fair Value	33,733	32,251
Mortgage-backed securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	155,197	150,353
Gross Unrealized Gains	1,926	3,026
Gross Unrealized Losses	(768)	(282)
Estimated Fair Value	$ 156,355	$ 153,097