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Investments (Fixed Income Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Schedule of Fixed Income Securities [Line Items]    
Due in one year or less fair value, AFS $ 310,387  
Due after one year through five years fair value, AFS 3,296,126  
Due after five years through 10 years fair value, AFS 2,191,633  
Due after 10 years fair value, AFS 132,091  
AFS, Fair Value 5,930,237 $ 5,273,100
Due in one year or less carrying value, HTM 4,754  
Due after one year through five years carrying value, HTM 16,334  
Due after five years through 10 years carrying value, HTM 5,837  
Due after 10 years carrying value, HTM 0  
HTM, Carrying Value 26,925 37,110
Due in one year or less fair value, HTM 4,773  
Due after one year through five years fair value, HTM 17,589  
Due after five years through 10 years fair value, HTM 5,994  
Due after 10 years fair value, HTM 0  
HTM, Fair Value $ 28,356 $ 38,317