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Investments - Amortized Cost and Fair Value of Available-for-sale Fixed Income Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 263,214 |
Due after one year through five years | 743,950 |
Due after five years through 10 years | 890,177 |
Due after 10 years | 548,742 |
ABS/CMBS/MBS | 1,209,871 |
Total available-for-sale | 3,655,954 | $ 3,391,159
Fair Value |  |
Due in one year or less | 262,065 |
Due after one year through five years | 739,290 |
Due after five years through 10 years | 891,802 |
Due after 10 years | 475,222 |
ABS/CMBS/MBS | 1,168,105 |
Total available-for-sale | $ 3,536,484 | $ 3,175,796

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