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Investments (Schedule of Net Realized and Unrealized Gains (Losses) on Investments) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Gain (Loss) on Securities [Line Items]        
Net realized and unrealized gains (losses) on investments $ 191,018 $ 448,390 $ (154,545) $ 337,683
Fixed maturity investments        
Gain (Loss) on Securities [Line Items]        
Net realized gains on fixed maturity investments trading 33,161 105,849 53,559 163,336
Net unrealized gains (losses) on fixed maturity investments trading 64,015 197,678 (233,003) 177,333
Net realized and unrealized gains (losses) on fixed maturity investments trading 97,176 303,527 (179,444) 340,669
Derivatives        
Gain (Loss) on Securities [Line Items]        
Net realized and unrealized (losses) gains on investments-related derivatives (9,329) 24,372 5,532 57,553
Equity investments        
Gain (Loss) on Securities [Line Items]        
Net realized gains (losses) on equity investments trading 93,411 422 203,298 (14,625)
Net unrealized (losses) gains on equity investments trading (27,845) 107,896 (205,654) 1,959
Net realized and unrealized gains (losses) on equity investments trading 65,566 108,318 (2,356) (12,666)
Catastrophe bonds | Other investments        
Gain (Loss) on Securities [Line Items]        
Net realized and unrealized gains (losses) on other investments 2 4,452 (19,081) (9,900)
Other | Other investments        
Gain (Loss) on Securities [Line Items]        
Net realized and unrealized gains (losses) on other investments $ 37,603 $ 7,721 $ 40,804 $ (37,973)