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Investments (Schedule of Net Realized and Unrealized (Losses) Gains on Investments) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Gain (Loss) on Securities [Line Items]    
Net realized and unrealized (losses) gains on investments $ (110,707) $ 170,013
Fixed maturity investments    
Gain (Loss) on Securities [Line Items]    
Gross realized gains 68,847 24,373
Gross realized losses (11,360) (22,943)
Net realized gains on fixed maturity investments 57,487 1,430
Net unrealized (losses) gains on fixed maturity investments trading (20,345) 103,922
Derivatives    
Gain (Loss) on Securities [Line Items]    
Net realized and unrealized gains on investments-related derivatives 33,181 13,796
Equity investments    
Gain (Loss) on Securities [Line Items]    
Net realized losses on equity investments trading sold during the period (15,047) (1,161)
Net unrealized (losses) gains on equity investments trading still held at reporting date   52,658
Net unrealized (losses) gains on equity investments trading still held at reporting date (105,937)  
Net realized and unrealized (losses) gains on equity investments trading (120,984) 51,497
Catastrophe bonds | Other investments    
Gain (Loss) on Securities [Line Items]    
Net realized and unrealized (losses) gains on other investments (14,352) (2,210)
Other | Other investments    
Gain (Loss) on Securities [Line Items]    
Net realized and unrealized (losses) gains on other investments $ (45,694) $ 1,578