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Investments - Schedule of Investments by Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Amortized Cost
Due in one year or less	$ 327,073	$ 261,492
Due after one through five years	1,767,053	1,549,468
Due after five through ten years	924,819	995,717
Due after ten years	6,790	25,562
Asset-backed securities	52,559	44,104
Amortized Cost	3,078,294	2,876,343
Fair Value
Due in one year or less	325,628	260,132
Due after one through five years	1,721,568	1,479,220
Due after five through ten years	911,763	916,885
Due after ten years	6,838	25,324
Asset-backed securities	49,763	41,980
Fair Value	$ 3,015,560	$ 2,723,541

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