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Investments (Schedule of Net Realized and Unrealized Gains on Investments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net realized and unrealized (losses) gains on equity investments trading |  |  |  |  |  |  |  |  | $ (39,161) | $ 119,544 | $ 95,364
Net realized and unrealized (losses) gains on investments | $ (88,654) | $ 13,630 | $ (17,901) | $ (82,144) | $ (7,716) | $ 42,052 | $ 58,113 | $ 43,373 | (175,069) | 135,822 | 141,328
Fixed maturity investments |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross realized gains |  |  |  |  |  |  |  |  | 21,284 | 49,121 | 72,739
Gross realized losses |  |  |  |  |  |  |  |  | (91,098) | (38,832) | (38,315)
Net realized (losses) gains on fixed maturity investments |  |  |  |  |  |  |  |  | (69,814) | 10,289 | 34,424
Net unrealized (losses) gains on fixed maturity investments trading |  |  |  |  |  |  |  |  | (57,310) | 8,479 | 26,954
Investments-related derivatives |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net realized and unrealized losses on investments-related derivatives |  |  |  |  |  |  |  |  | (8,784) | (2,490) | (15,414)
Equity investments |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net realized gains on equity investments trading sold during the period |  |  |  |  |  |  |  |  | 27,739 | 80,027 | 14,190
Net unrealized (losses) gains on equity investments trading still held at reporting date |  |  |  |  |  |  |  |  | $ (66,900) | $ 39,517 | $ 81,174

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