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Investments (Schedule of Net Realized and Unrealized (Losses) Gains on Investments) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Gain (Loss) on Securities [Line Items] |  |
Net realized and unrealized (losses) gains on investments | $ (110,707) | $ 170,013
Fixed maturity investments |  |
Gain (Loss) on Securities [Line Items] |  |
Gross realized gains | 68,847 | 24,373
Gross realized losses | (11,360) | (22,943)
Net realized gains on fixed maturity investments | 57,487 | 1,430
Net unrealized (losses) gains on fixed maturity investments trading | (20,345) | 103,922
Derivatives |  |
Gain (Loss) on Securities [Line Items] |  |
Net realized and unrealized gains on investments-related derivatives | 33,181 | 13,796
Equity investments |  |
Gain (Loss) on Securities [Line Items] |  |
Net realized losses on equity investments trading sold during the period | (15,047) | (1,161)
Net unrealized (losses) gains on equity investments trading still held at reporting date |  | 52,658
Net unrealized (losses) gains on equity investments trading still held at reporting date | (105,937) |
Net realized and unrealized (losses) gains on equity investments trading | (120,984) | 51,497
Catastrophe bonds | Other investments |  |
Gain (Loss) on Securities [Line Items] |  |
Net realized and unrealized (losses) gains on other investments | (14,352) | (2,210)
Other | Other investments |  |
Gain (Loss) on Securities [Line Items] |  |
Net realized and unrealized (losses) gains on other investments | $ (45,694) | $ 1,578

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