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Investments (Fixed Income Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Schedule of Fixed Income Securities [Line Items]    
Due in one year or less fair value, AFS $ 238,650  
Due after one year through five years fair value, AFS 2,126,600  
Due after five years through 10 years fair value, AFS 3,060,270  
Due after 10 years fair value, AFS 141,838  
AFS, Fair Value 5,567,358 $ 5,273,100
Due in one year or less carrying value, HTM 12,795  
Due after one year through five years carrying value, HTM 17,574  
Due after five years through 10 years carrying value, HTM 6,124  
Due after 10 years carrying value, HTM 0  
HTM, Carrying Value 36,493 37,110
Due in one year or less fair value, HTM 12,927  
Due after one year through five years fair value, HTM 18,728  
Due after five years through 10 years fair value, HTM 6,287  
Due after 10 years fair value, HTM 0  
HTM, Fair Value $ 37,942 $ 38,317