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Investments (Schedule of Other Investments) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule of Investments [Line Items]      
Other investments $ 1,256,948 $ 1,087,377  
Initial commitments 1,800,000    
Fulfilled commitments 809,000    
Unfunded commitments 1,000,000    
Other Investments      
Schedule of Investments [Line Items]      
Net unrealized gains recognized in earnings due to change in estimate (2,400) (5,500) $ 300
Catastrophe bonds      
Schedule of Investments [Line Items]      
Other investments 881,290 781,641  
Private equity investments      
Schedule of Investments [Line Items]      
Other investments 345,501 271,047  
Senior secured bank loan funds      
Schedule of Investments [Line Items]      
Other investments 19,604 22,598  
Hedge funds      
Schedule of Investments [Line Items]      
Other investments $ 10,553 $ 12,091