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Investments (Maturity Distribution) (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale, Amortized Cost
Due in one year or less	$ 31,925
Available-for-sale Securities, Debt Maturities, Due After One Year Through Five Years, Amortized Cost Basis	117,290
Available-for-sale Securities, Debt Maturities, Due After Five Years Through Ten Years, Amortized Cost Basis	281,140
Available-for-sale Securities, Debt Maturities, Due After Ten Years, Amortized Cost Basis	979,271
Debt Securities, Available-for-sale, Amortized Cost	1,409,626	$ 1,401,301
Debt Securities, Available-for-sale, Fair Value
Due in one year or less	31,911
Available-for-sale Securities, Debt Maturities, Due After One Year Through Five Years, Fair Value	117,944
Available-for-sale Securities, Debt Maturities, Due After Five Years Through Ten Years, Fair Value	281,669
Available-for-sale Securities, Debt Maturities, Due After Ten Years, Fair Value	838,521
Fixed maturity securities	$ 1,270,045	$ 1,220,961

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