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Investments (Fixed Maturity Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
AFS due in one year or less fair value $ 500,579  
AFS due after one year through five years fair value 3,182,282  
AFS due after five years through 10 years fair value 2,316,389  
AFS due after 10 years fair value 710,726  
Fixed income securities, available-for-sale securities 6,709,976 $ 6,455,928
HTM due in one year or less carrying value 1,384  
HTM due after one year through five years carrying value 11,811  
HTM due after five years through 10 years carrying value 15,590  
HTM due after 10 years carrying value 0  
Total HTM fixed income securities carrying value 28,785 16,824
HTM due in one year or less fair value 1,401  
HTM due after one year through five years fair value 12,493  
HTM due after five years through 10 years fair value 15,566  
HTM due after 10 years fair value 0  
Total HTM fixed income securities fair value $ 29,460 $ 18,001