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Investments (Schedule of Net Realized and Unrealized Gains (Losses) on Investments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Gain (Loss) on Securities [Line Items] |  |  |  |
Net realized and unrealized gains (losses) on investments | $ 191,018 | $ 448,390 | $ (154,545) | $ 337,683
Fixed maturity investments |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Net realized gains on fixed maturity investments trading | 33,161 | 105,849 | 53,559 | 163,336
Net unrealized gains (losses) on fixed maturity investments trading | 64,015 | 197,678 | (233,003) | 177,333
Net realized and unrealized gains (losses) on fixed maturity investments trading | 97,176 | 303,527 | (179,444) | 340,669
Derivatives |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Net realized and unrealized (losses) gains on investments-related derivatives | (9,329) | 24,372 | 5,532 | 57,553
Equity investments |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Net realized gains (losses) on equity investments trading | 93,411 | 422 | 203,298 | (14,625)
Net unrealized (losses) gains on equity investments trading | (27,845) | 107,896 | (205,654) | 1,959
Net realized and unrealized gains (losses) on equity investments trading | 65,566 | 108,318 | (2,356) | (12,666)
Catastrophe bonds | Other investments |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Net realized and unrealized gains (losses) on other investments | 2 | 4,452 | (19,081) | (9,900)
Other | Other investments |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Net realized and unrealized gains (losses) on other investments | $ 37,603 | $ 7,721 | $ 40,804 | $ (37,973)

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