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Investments - Fixed Income Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
AFS, Fair Value |  |
Due in one year or less fair value, AFS | $ 582,163 |
Due after one year through five years fair value, AFS | 3,435,983 |
Due after five years through 10 years fair value, AFS | 2,833,659 |
Due after 10 years fair value, AFS | 731,699 |
Total AFS fixed income securities, Fair Value | 7,583,504 | $ 7,499,197
HTM, Carrying Value |  |
Due in one year or less carrying value, HTM | 0 |
Due after one year through five years carrying value, HTM | 15,716 |
Due after five years through 10 years carrying value, HTM | 4,579 |
Due after 10 years carrying value, HTM | 0 |
Fixed income securities, held-to-maturity, net of allowance for credit losses | 20,295 | 22,700
HTM, Fair Value |  |
Due in one year or less fair value, HTM | 0 |
Due after one year through five years fair value, HTM | 14,898 |
Due after five years through 10 years fair value, HTM | 4,285 |
Due after 10 years fair value, HTM | 0 |
Total HTM fixed income securities, Fair Value | $ 19,183 | $ 21,923

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