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Investments (Schedule of Contractual Maturities of Fixed Maturity Investments) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Amortized  Cost    
Due in less than one year $ 632,368  
Due after one through five years 5,265,502  
Due after five through ten years 3,674,901  
Due after ten years 549,661  
Amortized cost 13,155,035 $ 11,067,414
Debt Securities, Trading, and Equity Securities, FV-NI [Abstract]    
Due in less than one year 637,418  
Due after one through five years 5,391,122  
Due after five through ten years 3,806,564  
Due after ten years 583,908  
Fixed maturity investments 13,506,503 11,171,655
Mortgage-backed    
Amortized  Cost    
Amortized cost 2,145,366  
Debt Securities, Trading, and Equity Securities, FV-NI [Abstract]    
Fixed maturity investments 2,196,507  
Asset-backed    
Amortized  Cost    
Amortized cost 887,237  
Debt Securities, Trading, and Equity Securities, FV-NI [Abstract]    
Fixed maturity investments $ 890,984 $ 555,070