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Investments (Schedule of Contractual Maturities of Fixed Maturity Investments) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Amortized  Cost    
Due in less than one year $ 568,444  
Due after one through five years 5,498,414  
Due after five through ten years 3,822,345  
Due after ten years 562,618  
Amortized Cost 13,258,985 $ 13,155,035
Fair Value    
Due in less than one year 572,443  
Due after one through five years 5,569,638  
Due after five through ten years 3,786,423  
Due after ten years 549,453  
Fixed maturity investments 13,309,234 13,506,503
Mortgage-backed    
Amortized  Cost    
Amortized Cost 1,922,325  
Fair Value    
Fixed maturity investments 1,943,137  
Asset-backed    
Amortized  Cost    
Amortized Cost 884,839  
Fair Value    
Fixed maturity investments $ 888,140 $ 890,984