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Investments (Schedule of Net Realized and Unrealized Gains on Investments) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Gain (Loss) on Securities [Line Items]        
Net realized and unrealized gains on investments $ 448,390 $ 191,247 $ 337,683 $ 361,260
Fixed maturity investments        
Gain (Loss) on Securities [Line Items]        
Net realized gains on fixed maturity investments trading 105,849 21,295 163,336 22,725
Net unrealized gains on fixed maturity investments trading 197,678 121,991 177,333 225,913
Net realized and unrealized gains on fixed maturity investments trading 303,527 143,286 340,669 248,638
Derivatives        
Gain (Loss) on Securities [Line Items]        
Net realized and unrealized gains on investments-related derivatives 24,372 37,173 57,553 50,969
Equity investments        
Gain (Loss) on Securities [Line Items]        
Net realized gains (losses) on equity investments trading 422 31,899   30,738
Net realized gains (losses) on equity investments trading     (14,625)  
Net unrealized gains (losses) on equity investments trading 107,896   1,959 34,303
Net unrealized gains (losses) on equity investments trading   (18,355)    
Net realized and unrealized gains (losses) on equity investments trading 108,318 13,544 (12,666) 65,041
Catastrophe bonds | Other investments        
Gain (Loss) on Securities [Line Items]        
Net realized and unrealized (losses) gains on other investments 4,452 (11,902) (9,900) (14,112)
Other | Other investments        
Gain (Loss) on Securities [Line Items]        
Net realized and unrealized (losses) gains on other investments $ 7,721 $ 9,146 $ (37,973) $ 10,724