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Investments (Schedule of Contractual Maturities of Fixed Maturity Investments) (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Amortized  Cost    
Due in less than one year $ 435,206  
Due after one through five years 6,363,352  
Due after five through ten years 3,870,535  
Due after ten years 282,741  
Amortized Cost 13,540,901 $ 13,552,579
Fair Value    
Due in less than one year 434,040  
Due after one through five years 6,147,438  
Due after five through ten years 3,650,795  
Due after ten years 260,876  
Fixed maturity investments 13,029,085 13,507,131
Mortgage-backed    
Amortized  Cost    
Amortized Cost 1,535,330  
Fair Value    
Fixed maturity investments 1,493,507  
Asset-backed    
Amortized  Cost    
Amortized Cost 1,053,737  
Fair Value    
Fixed maturity investments $ 1,042,429 $ 1,068,543