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Investments (Fixed Income Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Schedule of Fixed Income Securities [Line Items]    
Due in one year or less fair value, AFS $ 295,885  
Due after one year through five years fair value, AFS 3,471,503  
Due after five years through 10 years fair value, AFS 1,925,970  
Due after 10 years fair value, AFS 252,002  
AFS, Fair Value 5,945,360 $ 6,095,620
Due in one year or less carrying value, HTM 929  
Due after one year through five years carrying value, HTM 13,943  
Due after five years through 10 years carrying value, HTM 5,508  
Due after 10 years carrying value, HTM 0  
HTM, Carrying Value 20,380 20,800
Due in one year or less fair value, HTM 965  
Due after one year through five years fair value, HTM 15,115  
Due after five years through 10 years fair value, HTM 5,841  
Due after 10 years fair value, HTM 0  
HTM, Fair Value $ 21,921 $ 21,975