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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Gain (Loss) on Securities [Line Items] |  |  |  |
Net realized and unrealized gains (losses) on investments | $ 13,630 | $ 42,052 | $ (86,415) | $ 143,538
Fixed maturity investments |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Gross realized gains | 5,229 | 16,343 | 14,945 | 43,053
Gross realized losses | (15,327) | (6,126) | (67,699) | (29,902)
Net realized (losses) gains on fixed maturity investments | (10,098) | 10,217 | (52,754) | 13,151
Net unrealized (losses) gains on fixed maturity investments trading | (8,730) | 5,545 | (73,522) | 48,940
Derivatives |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Net realized and unrealized gains (losses) on investments-related derivatives | 2,563 | (4,020) | (763) | (4,344)
Equity investments |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Net realized gains on equity investments trading sold during the period | 21,259 | 13,675 | 21,841 | 49,736
Net unrealized gains on equity investments trading still held at reporting date | 8,636 | 16,635 | 18,783 | 36,055
Net realized and unrealized gains on equity investments trading | $ 29,895 | $ 30,310 | $ 40,624 | $ 85,791

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