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Investments (Fixed Maturity Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
AFS due in one year or less fair value $ 511,125  
AFS due after one year through five years fair value 3,450,675  
AFS due after five years through 10 years fair value 2,817,046  
AFS due after 10 years fair value 720,351  
Total AFS Fixed income securities, Fair Value 7,499,197 $ 6,612,107
HTM due in one year or less carrying value 0  
HTM due after one year through five years carrying value 13,624  
HTM due after five years through 10 years carrying value 9,076  
HTM due after 10 years carrying value 0  
Fixed income securities, held-to-maturity, net of allowance for credit losses 22,700 31,157
HTM due in one year or less fair value 0  
HTM due after one year through five years fair value 13,307  
HTM due after five years through 10 years fair value 8,616  
HTM due after 10 years fair value 0  
Total HTM fixed income securities fair value $ 21,923 $ 29,837