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Investments (Schedule of Contractual Maturities of Fixed Maturity Investments) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Amortized  Cost    
Due in less than one year $ 632,668  
Due after one through five years 5,388,088  
Due after five through ten years 3,185,015  
Due after ten years 602,473  
Amortized Cost 12,188,507 $ 11,067,414
Fair Value    
Due in less than one year 638,686  
Due after one through five years 5,513,103  
Due after five through ten years 3,312,749  
Due after ten years 626,768  
Fixed maturity investments 12,495,135 11,171,655
Mortgage-backed    
Amortized  Cost    
Amortized Cost 1,820,084  
Fair Value    
Fixed maturity investments 1,853,388  
Asset-backed    
Amortized  Cost    
Amortized Cost 560,179  
Fair Value    
Fixed maturity investments $ 550,441 $ 555,070