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Investments (Schedule of Net Realized and Unrealized Losses on Investments) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Gain (Loss) on Securities [Line Items] |  |
Net realized and unrealized losses on investments | $ (345,563) | $ (110,707)
Fixed maturity investments |  |
Gain (Loss) on Securities [Line Items] |  |
Net realized gains on fixed maturity investments trading | 20,398 | 57,487
Net unrealized losses on fixed maturity investments trading | (297,018) | (20,345)
Net realized and unrealized (losses) gains on fixed maturity investments trading | (276,620) | 37,142
Derivatives |  |
Gain (Loss) on Securities [Line Items] |  |
Net realized and unrealized gains on investments-related derivatives | 14,861 | 33,181
Equity investments |  |
Gain (Loss) on Securities [Line Items] |  |
Net realized gains (losses) on equity investments trading | 109,887 | (15,047)
Net unrealized losses on equity investments trading | (177,809) | (105,937)
Net realized and unrealized losses on equity investments trading | (67,922) | (120,984)
Catastrophe bonds | Other investments |  |
Gain (Loss) on Securities [Line Items] |  |
Net realized and unrealized (losses) gains on other investments | (19,083) | (14,352)
Other | Other investments |  |
Gain (Loss) on Securities [Line Items] |  |
Net realized and unrealized (losses) gains on other investments | $ 3,201 | $ (45,694)

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