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Investments (Schedule of Net Realized and Unrealized Gains (Losses) on Investments) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Gain (Loss) on Securities [Line Items]        
Net realized and unrealized (losses) gains on investments $ (42,071) $ 224,208 $ (196,616) $ 561,891
Fixed maturity investments        
Gain (Loss) on Securities [Line Items]        
Net realized gains on fixed maturity investments trading 27,501 55,665 81,060 219,001
Net unrealized (losses) gains on fixed maturity investments trading (56,869) 16,316 (289,872) 193,649
Net realized and unrealized (losses) gains on fixed maturity investments trading (29,368) 71,981 (208,812) 412,650
Derivatives        
Gain (Loss) on Securities [Line Items]        
Net realized and unrealized (losses) gains on investments-related derivatives (2,056) 2,033 3,476 59,586
Equity investments        
Gain (Loss) on Securities [Line Items]        
Net realized gains on equity investments trading 52,604 16,624 255,902 1,999
Net unrealized (losses) gains on equity investments trading (74,284) 107,332 (279,938) 109,291
Net realized and unrealized (losses) gains on equity investments trading (21,680) 123,956 (24,036) 111,290
Catastrophe bonds | Other investments        
Gain (Loss) on Securities [Line Items]        
Net realized and unrealized gains (losses) on other investments (5,994) 12,611 (25,075) 2,711
Other | Other investments        
Gain (Loss) on Securities [Line Items]        
Net realized and unrealized gains (losses) on other investments $ 17,027 $ 13,627 $ 57,831 $ (24,346)