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Investments (Schedule of Net Realized and Unrealized Gains (Losses) on Investments) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Gain (Loss) on Securities [Line Items]    
Net realized and unrealized gains (losses) on investments $ (673,017) $ (345,563)
Fixed maturity investments    
Gain (Loss) on Securities [Line Items]    
Net realized gains (losses) on fixed maturity investments trading (121,152) 20,398
Net unrealized gains (losses) on fixed maturity investments trading (464,177) (297,018)
Net realized and unrealized gains (losses) on fixed maturity investments trading (585,329) (276,620)
Derivatives    
Gain (Loss) on Securities [Line Items]    
Net realized and unrealized gains (losses) on investments-related derivatives (40,288) 14,861
Equity investments    
Gain (Loss) on Securities [Line Items]    
Net realized gains (losses) on equity investments trading sold during the period (20) 109,887
Net unrealized gains (losses) on equity investments trading still held at reporting date (48,669) (177,809)
Net realized and unrealized gains (losses) on equity investments trading (48,689) (67,922)
Catastrophe bonds | Other investments    
Gain (Loss) on Securities [Line Items]    
Net realized and unrealized gains (losses) on other investments (8,261) (19,083)
Other | Other investments    
Gain (Loss) on Securities [Line Items]    
Net realized and unrealized gains (losses) on other investments $ 9,550 $ 3,201