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Investments (Schedule of Other Investments) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Schedule of Investments [Line Items]      
Other investments $ 1,993,059 $ 1,256,948  
Initial commitments 2,700,000    
Fulfilled commitments 1,300,000    
Unfunded commitments 1,400,000    
Other Investments      
Schedule of Investments [Line Items]      
Net unrealized gain (loss) recognized in earnings due to change in estimate 7,000 (2,400) $ (5,500)
Catastrophe bonds      
Schedule of Investments [Line Items]      
Other investments $ 1,104,034 881,290  
Catastrophe bonds | Low      
Schedule of Investments [Line Items]      
Maturity period 1 year    
Catastrophe bonds | High      
Schedule of Investments [Line Items]      
Maturity period 5 years    
Direct private equity investments      
Schedule of Investments [Line Items]      
Other investments $ 88,373 79,807  
Fund investments      
Schedule of Investments [Line Items]      
Other investments 725,802 295,851  
Term loans      
Schedule of Investments [Line Items]      
Other investments $ 74,850 $ 0