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Investments (Schedule of Contractual Maturities of Fixed Maturity Investments) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Amortized Cost    
Due in less than one year $ 718,359  
Due after one through five years 4,984,696  
Due after five through ten years 2,549,975  
Due after ten years 254,762  
Amortized Cost 10,941,672 $ 11,067,414
Fair Value    
Due in less than one year 723,397  
Due after one through five years 5,039,456  
Due after five through ten years 2,612,031  
Due after ten years 256,375  
Fixed maturity investments 11,045,801 11,171,655
Mortgage-backed    
Amortized Cost    
Amortized Cost 1,862,064  
Fair Value    
Fixed maturity investments 1,871,800  
Asset-backed    
Amortized Cost    
Amortized Cost 571,816  
Fair Value    
Fixed maturity investments $ 542,742 $ 555,070