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Investments (Fixed Maturity Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
AFS due in one year or less fair value $ 394,027  
AFS due after one year through five years fair value 3,001,602  
AFS due after five years through 10 years fair value 2,531,172  
AFS due after 10 years fair value 168,819  
Fixed income securities, available-for-sale securities 6,095,620 $ 5,273,100
HTM due in one year or less carrying value 1,211  
HTM due after one year through five years carrying value 13,856  
HTM due after five years through 10 years carrying value 5,733  
HTM due after 10 years carrying value 0  
Total HTM fixed income securities carrying value 20,800 37,110
HTM due in one year or less fair value 1,229  
HTM due after one year through five years fair value 14,820  
HTM due after five years through 10 years fair value 5,926  
HTM due after 10 years fair value 0  
Total HTM fixed income securities fair value $ 21,975 $ 38,317