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Investments - Fixed-maturity Securities Classified by Contractual Maturity Securities (Details) (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
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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