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Investments (Schedule of Net Realized and Unrealized (Losses) Gains on Investments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Gain (Loss) on Securities [Line Items] |  |  |  |
Net realized and unrealized gains (losses) on investments | $ 194,003 | $ (17,901) | $ 364,648 | $ (100,045)
Fixed maturity investments |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Gross realized gains | 28,512 | 5,133 | 52,885 | 9,716
Gross realized losses | (7,217) | (26,519) | (30,160) | (52,372)
Net realized gains (losses) on fixed maturity investments | 21,295 | (21,386) | 22,725 | (42,656)
Net unrealized gains (losses) on fixed maturity investments trading | 121,991 | (9,420) | 225,913 | (64,792)
Derivatives |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Net realized and unrealized gains (losses) on investments-related derivatives | 37,173 | 1,038 | 50,969 | (3,326)
Equity investments |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Net realized gains on equity investments trading sold during the period | 31,899 | 348 | 30,738 | 582
Net unrealized (losses) gains on equity investments trading still held at reporting date | (18,355) | 11,519 | 34,303 | 10,147
Net realized and unrealized gains on equity investments trading | $ 13,544 | $ 11,867 | $ 65,041 | $ 10,729

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