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Investments (Maturity Distribution) (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale, Amortized Cost    
Due in one year or less $ 34,225  
Available-for-sale Securities, Debt Maturities, Due After One Year Through Five Years, Amortized Cost Basis 116,768  
Available-for-sale Securities, Debt Maturities, Due After Five Years Through Ten Years, Amortized Cost Basis 214,234  
Available-for-sale Securities, Debt Maturities, Due After Ten Years, Amortized Cost Basis 997,177  
Debt Securities, Available-for-sale, Amortized Cost 1,362,404 $ 1,343,755
Debt Securities, Available-for-sale, Fair Value    
Due in one year or less 34,518  
Available-for-sale Securities, Debt Maturities, Due After One Year Through Five Years, Fair Value 117,642  
Available-for-sale Securities, Debt Maturities, Due After Five Years Through Ten Years, Fair Value 210,114  
Available-for-sale Securities, Debt Maturities, Due After Ten Years, Fair Value 874,730  
Fixed maturity securities, available-for-sale $ 1,237,004 $ 1,470,617