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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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