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Investments (Maturity Distribution) (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale, Amortized Cost    
Due in one year or less $ 13,739  
Available-for-sale Securities, Debt Maturities, Due After One Year Through Five Years, Amortized Cost Basis 131,109  
Available-for-sale Securities, Debt Maturities, Due After Five Years Through Ten Years, Amortized Cost Basis 287,364  
Available-for-sale Securities, Debt Maturities, Due After Ten Years, Amortized Cost Basis 958,275  
Debt Securities, Available-for-sale, Amortized Cost 1,390,487 $ 1,389,038
Debt Securities, Available-for-sale, Fair Value    
Due in one year or less 13,634  
Available-for-sale Securities, Debt Maturities, Due After One Year Through Five Years, Fair Value 128,939  
Available-for-sale Securities, Debt Maturities, Due After Five Years Through Ten Years, Fair Value 278,050  
Available-for-sale Securities, Debt Maturities, Due After Ten Years, Fair Value 792,780  
Fixed maturity securities, available-for-sale $ 1,213,403 $ 1,238,981