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Investments (Schedule of Net Realized and Unrealized Gains on Investments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Gain (Loss) on Securities [Line Items] |  |  |  |
Net realized and unrealized gains on investments | $ 448,390 | $ 191,247 | $ 337,683 | $ 361,260
Fixed maturity investments |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Net realized gains on fixed maturity investments trading | 105,849 | 21,295 | 163,336 | 22,725
Net unrealized gains on fixed maturity investments trading | 197,678 | 121,991 | 177,333 | 225,913
Net realized and unrealized gains on fixed maturity investments trading | 303,527 | 143,286 | 340,669 | 248,638
Derivatives |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Net realized and unrealized gains on investments-related derivatives | 24,372 | 37,173 | 57,553 | 50,969
Equity investments |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Net realized gains (losses) on equity investments trading | 422 | 31,899 |  | 30,738
Net realized gains (losses) on equity investments trading |  |  | (14,625) |
Net unrealized gains (losses) on equity investments trading | 107,896 |  | 1,959 | 34,303
Net unrealized gains (losses) on equity investments trading |  | (18,355) |  |
Net realized and unrealized gains (losses) on equity investments trading | 108,318 | 13,544 | (12,666) | 65,041
Catastrophe bonds | Other investments |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Net realized and unrealized (losses) gains on other investments | 4,452 | (11,902) | (9,900) | (14,112)
Other | Other investments |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Net realized and unrealized (losses) gains on other investments | $ 7,721 | $ 9,146 | $ (37,973) | $ 10,724

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