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Investments (Schedule of Contractual Maturities of Fixed Maturity Investments) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Amortized  Cost    
Due in less than one year $ 386,699  
Due after one through five years 6,501,760  
Due after five through ten years 4,012,242  
Due after ten years 342,378  
Amortized Cost 13,785,873 $ 13,155,035
Fair Value    
Due in less than one year 388,647  
Due after one through five years 6,540,886  
Due after five through ten years 4,003,465  
Due after ten years 346,146  
Fixed maturity investments 13,839,248 13,506,503
Mortgage-backed    
Amortized  Cost    
Amortized Cost 1,603,160  
Fair Value    
Fixed maturity investments 1,618,926  
Asset-backed    
Amortized  Cost    
Amortized Cost 939,634  
Fair Value    
Fixed maturity investments $ 941,178 $ 890,984