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Investments (Schedule of Net Realized and Unrealized (Losses) Gains on Investments) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Gain (Loss) on Securities [Line Items] |  |
Net realized and unrealized gains (losses) on investments | $ 170,645 | $ (82,144)
Fixed maturity investments |  |
Gain (Loss) on Securities [Line Items] |  |
Gross realized gains | 24,373 | 4,583
Gross realized losses | (22,943) | (25,853)
Net realized gains (losses) on fixed maturity investments | 1,430 | (21,270)
Net unrealized gains (losses) on fixed maturity investments trading | 103,922 | (55,372)
Derivatives |  |
Gain (Loss) on Securities [Line Items] |  |
Net realized and unrealized gains (losses) on investments-related derivatives | 13,796 | (4,364)
Equity investments |  |
Gain (Loss) on Securities [Line Items] |  |
Net realized (losses) gains on equity investments trading sold during the period | (1,161) | 234
Net unrealized gains (losses) on equity investments trading still held at reporting date | 52,658 | (1,372)
Net realized and unrealized gains (losses) on equity investments trading | $ 51,497 | $ (1,138)

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