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Investments (Fixed Income Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Schedule of Fixed Income Securities [Line Items]    
Due in one year or less fair value, AFS $ 315,316  
Due after one year through five years fair value, AFS 3,639,491  
Due after five years through 10 years fair value, AFS 2,053,058  
Due after 10 years fair value, AFS 350,291  
AFS, Fair Value 6,358,156 $ 6,095,620
Due in one year or less carrying value, HTM 440  
Due after one year through five years carrying value, HTM 16,591  
Due after five years through 10 years carrying value, HTM 2,511  
Due after 10 years carrying value, HTM 0  
HTM, Carrying Value 19,542 20,800
Due in one year or less fair value, HTM 448  
Due after one year through five years fair value, HTM 17,843  
Due after five years through 10 years fair value, HTM 2,436  
Due after 10 years fair value, HTM 0  
HTM, Fair Value $ 20,727 $ 21,975