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Investments - Amortized Cost and Fair Value of Available-for-sale Fixed Income Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2026 | Dec. 31, 2025
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 197,626 |
Due after one year through five years | 737,002 |
Due after five years through 10 years | 855,922 |
Due after 10 years | 523,694 |
ABS/CMBS/MBS | 1,355,677 |
Total available-for-sale | 3,669,921 | $ 3,642,362
Fair Value |  |
Due in one year or less | 196,770 |
Due after one year through five years | 726,768 |
Due after five years through 10 years | 845,397 |
Due after 10 years | 448,654 |
ABS/CMBS/MBS | 1,311,103 |
Total available-for-sale | $ 3,528,692 | $ 3,533,336

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