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Investments (Maturity Distribution) (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale, Amortized Cost
Due in one year or less	$ 9,753
Available-for-sale Securities, Debt Maturities, Due After One Year Through Five Years, Amortized Cost Basis	131,003
Available-for-sale Securities, Debt Maturities, Due After Five Years Through Ten Years, Amortized Cost Basis	248,095
Available-for-sale Securities, Debt Maturities, Due After Ten Years, Amortized Cost Basis	999,068
Debt Securities, Available-for-sale, Amortized Cost	1,387,919	$ 1,381,318
Debt Securities, Available-for-sale, Fair Value
Due in one year or less	9,718
Available-for-sale Securities, Debt Maturities, Due After One Year Through Five Years, Fair Value	129,487
Available-for-sale Securities, Debt Maturities, Due After Five Years Through Ten Years, Fair Value	240,207
Available-for-sale Securities, Debt Maturities, Due After Ten Years, Fair Value	850,279
Fixed maturity securities, available-for-sale	$ 1,229,691	$ 1,179,619

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