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Investments (Maturity Distribution) (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale, Amortized Cost
Due in one year or less	$ 22,156
Available-for-sale Securities, Debt Maturities, Due After One Year Through Five Years, Amortized Cost Basis	118,051
Available-for-sale Securities, Debt Maturities, Due After Five Years Through Ten Years, Amortized Cost Basis	228,829
Available-for-sale Securities, Debt Maturities, Due After Ten Years, Amortized Cost Basis	1,005,741
Debt Securities, Available-for-sale, Amortized Cost	1,374,777	$ 1,343,755
Debt Securities, Available-for-sale, Fair Value
Due in one year or less	22,244
Available-for-sale Securities, Debt Maturities, Due After One Year Through Five Years, Fair Value	115,766
Available-for-sale Securities, Debt Maturities, Due After Five Years Through Ten Years, Fair Value	214,219
Available-for-sale Securities, Debt Maturities, Due After Ten Years, Fair Value	808,819
Fixed maturity securities, available-for-sale	$ 1,161,048	$ 1,470,617

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