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Investments - Schedule of Contractual Maturities of Fixed Maturity Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized Cost |  |
Amortized Cost | $ 2,812,412 | $ 2,294,936
Fair Value |  |
Fair Value | 2,828,131 | 2,260,146
Total fixed maturities |  |
Amortized Cost |  |
Amortized Cost | 2,306,168 | 1,867,499
Fair Value |  |
Fair Value | 2,320,184 | $ 1,831,268
Fixed Maturities, Excluding Mortgage-backed and Asset-backed Securities |  |
Amortized Cost |  |
Due less than one year | 149,305 |
Due after one through five years | 1,590,516 |
Due after five through ten years | 224,518 |
Due after ten years | 3,807 |
Fair Value |  |
Due less than one year | 148,136 |
Due after one through five years | 1,607,936 |
Due after five through ten years | 229,859 |
Due after ten years | 3,437 |
Mortgage-backed securities |  |
Amortized Cost |  |
Mortgage/Asset-backed | 297,767 |
Fair Value |  |
Mortgage/Asset-backed | 289,982 |
Asset-backed securities |  |
Amortized Cost |  |
Mortgage/Asset-backed | 40,255 |
Fair Value |  |
Mortgage/Asset-backed | $ 40,834 |

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