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Investments - Fixed-maturity Securities Classified by Contractual Maturity Securities (Details) (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Available-for-sale Securities, Debt Maturities [Abstract] |  |
Total available-for-sale fixed-maturity securities | $ 3,147,647 | $ 2,946,126
Fixed Maturities |  |
Available-for-sale Securities, Debt Maturities [Abstract] |  |
Due in one year or less, amortized cost | 215,568 |
Due after one year through five years, amortized cost | 802,017 |
Due after five years through 10 years, amortized cost | 718,564 |
Due after 10 years, amortized cost | 579,997 |
Total fixed-maturity securities with single maturity dates, amortized cost | 2,316,146 |
Mortgage and asset-backed securities, amortized cost | 947,665 |
Available-for-sale debt securities, amortized cost basis | 3,263,811 | $ 3,152,483
Due in one year or less, fair value | 215,341 |
Due after one year through five years, fair value | 797,183 |
Due after five years through 10 years, fair value | 692,664 |
Due after 10 years, fair value | 553,264 |
Total fixed-maturity securities with single maturity dates, fair value | 2,258,452 |
Mortgage and asset-backed securities, fair value | 889,195 |
Total available-for-sale fixed-maturity securities | $ 3,147,647 |

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