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Investments (Schedule of Net Realized and Unrealized (Losses) Gains on Investments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Gain (Loss) on Securities [Line Items] |  |  |  |
Net realized and unrealized gains (losses) on investments | $ 31,938 | $ 13,630 | $ 396,586 | $ (86,415)
Fixed maturity investments |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Gross realized gains | 34,710 | 5,229 | 87,595 | 14,945
Gross realized losses | (4,609) | (15,327) | (34,769) | (67,699)
Net realized gains (losses) on fixed maturity investments | 30,101 | (10,098) | 52,826 | (52,754)
Net unrealized gains (losses) on fixed maturity investments trading | 17,226 | (8,730) | 243,139 | (73,522)
Derivatives |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Net realized and unrealized gains (losses) on investments-related derivatives | 11,134 | 2,563 | 62,103 | (763)
Equity investments |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Net realized (losses) gains on equity investments trading sold during the period | (72) |  |  |
Net realized (losses) gains on equity investments trading sold during the period |  | 21,259 | 30,666 | 21,841
Net unrealized (losses) gains on equity investments trading still held at reporting date | (26,451) |  |  |
Net unrealized (losses) gains on equity investments trading still held at reporting date |  | 8,636 | 7,852 | 18,783
Net realized and unrealized (losses) gains on equity investments trading | $ (26,523) | $ 29,895 | $ 38,518 | $ 40,624

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