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Investments (Maturity Distribution) (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale, Amortized Cost
Due in one year or less	$ 29,590
Available-for-sale Securities, Debt Maturities, Due After One Year Through Five Years, Amortized Cost Basis	134,188
Available-for-sale Securities, Debt Maturities, Due After Five Years Through Ten Years, Amortized Cost Basis	261,428
Available-for-sale Securities, Debt Maturities, Due After Ten Years, Amortized Cost Basis	984,145
Debt Securities, Available-for-sale, Amortized Cost	1,409,351	$ 1,401,301
Debt Securities, Available-for-sale, Fair Value
Due in one year or less	29,545
Available-for-sale Securities, Debt Maturities, Due After One Year Through Five Years, Fair Value	134,263
Available-for-sale Securities, Debt Maturities, Due After Five Years Through Ten Years, Fair Value	257,371
Available-for-sale Securities, Debt Maturities, Due After Ten Years, Fair Value	826,249
Fixed maturity securities	$ 1,247,428	$ 1,220,961

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