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Investments (Fixed Maturity Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
AFS due in one year or less fair value $ 324,394  
AFS due after one year through five years fair value 2,928,594  
AFS due after five years through 10 years fair value 2,600,001  
AFS due after 10 years fair value 759,118  
Total AFS Fixed income securities, Fair Value 6,612,107 $ 6,709,976
HTM due in one year or less carrying value 6,093  
HTM due after one year through five years carrying value 3,779  
HTM due after five years through 10 years carrying value 21,285  
HTM due after 10 years carrying value 0  
Fixed income securities, held-to-maturity, net of allowance for credit losses 31,157 28,785
HTM due in one year or less fair value 6,090  
HTM due after one year through five years fair value 3,798  
HTM due after five years through 10 years fair value 19,949  
HTM due after 10 years fair value 0  
Total HTM fixed income securities fair value $ 29,837 $ 29,460