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Investments - Fixed-maturity Securities Classified by Contractual Maturity Securities (Details) (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
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Available-for-sale Securities, Debt Maturities [Abstract] |  |
Total available-for-sale fixed-maturity securities | $ 3,096,708 | $ 2,946,126
Fixed Maturities |  |
Available-for-sale Securities, Debt Maturities [Abstract] |  |
Due in one year or less, amortized cost | 204,229 |
Due after one year through five years, amortized cost | 804,733 |
Due after five years through 10 years, amortized cost | 750,594 |
Due after 10 years, amortized cost | 553,866 |
Total fixed-maturity securities with single maturity dates, amortized cost | 2,313,422 |
Mortgage and asset-backed securities, amortized cost | 941,279 |
Available-for-sale debt securities, amortized cost basis | 3,254,701 | $ 3,152,483
Due in one year or less, fair value | 203,755 |
Due after one year through five years, fair value | 795,769 |
Due after five years through 10 years, fair value | 711,116 |
Due after 10 years, fair value | 513,272 |
Total fixed-maturity securities with single maturity dates, fair value | 2,223,912 |
Mortgage and asset-backed securities, fair value | 872,796 |
Total available-for-sale fixed-maturity securities | $ 3,096,708 |

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