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Investments (Fixed Income Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Schedule of Fixed Income Securities [Line Items]    
Due in one year or less fair value, AFS $ 280,140  
Due after one year through five years fair value, AFS 2,237,395  
Due after five years through 10 years fair value, AFS 3,065,577  
Due after 10 years fair value, AFS 174,786  
AFS, Fair Value 5,757,898 $ 5,273,100
Due in one year or less carrying value, HTM 9,480  
Due after one year through five years carrying value, HTM 16,860  
Due after five years through 10 years carrying value, HTM 6,024  
Due after 10 years carrying value, HTM 0  
HTM, Carrying Value 32,364 37,110
Due in one year or less fair value, HTM 9,526  
Due after one year through five years fair value, HTM 18,109  
Due after five years through 10 years fair value, HTM 6,220  
Due after 10 years fair value, HTM 0  
HTM, Fair Value $ 33,855 $ 38,317