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Investments (Schedule of Net Realized and Unrealized Gains on Investments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Gain (Loss) on Securities [Line Items] |  |  |  |
Net realized and unrealized gains on investments | $ 224,208 | $ 34,395 | $ 561,891 | $ 395,655
Fixed maturity investments |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Net realized gains on fixed maturity investments trading | 55,665 | 30,101 | 219,001 | 52,826
Net unrealized gains on fixed maturity investments trading | 16,316 | 17,226 | 193,649 | 243,139
Net realized and unrealized gains on fixed maturity investments trading | 71,981 | 47,327 | 412,650 | 295,965
Derivatives |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Net realized and unrealized gains on investments-related derivatives | 2,033 | 11,134 | 59,586 | 62,103
Equity investments |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Net realized gains (losses) on equity investments trading | 16,624 | (72) | 1,999 | 30,666
Net unrealized gains (losses) on equity investments trading | 107,332 | (26,451) | 109,291 | 7,852
Net realized and unrealized gains (losses) on equity investments trading | 123,956 | (26,523) | 111,290 | 38,518
Catastrophe bonds | Other investments |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Net realized and unrealized (losses) gains on other investments | 12,611 | 9,242 | 2,711 | (4,870)
Other | Other investments |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Net realized and unrealized (losses) gains on other investments | $ 13,627 | $ (6,785) | $ (24,346) | $ 3,939

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