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Investments (Schedule of Net Realized and Unrealized Gains (Losses) on Investments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net realized and unrealized gains (losses) on equity investments trading |  |  |  |  |  |  |  |  | $ 95,149 | $ (39,161) | $ 119,544
Net realized and unrealized gains (losses) on investments | $ 17,897 | $ 31,938 | $ 194,003 | $ 170,645 | $ (88,654) | $ 13,630 | $ (17,901) | $ (82,144) | 414,483 | (175,069) | 135,822
Fixed maturity investments |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross realized gains |  |  |  |  |  |  |  |  | 133,409 | 21,284 | 49,121
Gross realized losses |  |  |  |  |  |  |  |  | (43,149) | (91,098) | (38,832)
Net realized gains (losses) on fixed maturity investments |  |  |  |  |  |  |  |  | 90,260 | (69,814) | 10,289
Net unrealized gains (losses) on fixed maturity investments trading |  |  |  |  |  |  |  |  | 170,183 | (57,310) | 8,479
Investments-related derivatives |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net realized and unrealized gains (losses) on investments-related derivatives |  |  |  |  |  |  |  |  | 58,891 | (8,784) | (2,490)
Equity investments |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net realized gains on equity investments trading sold during the period |  |  |  |  |  |  |  |  | 31,062 | 27,739 | 80,027
Net unrealized gains (losses) on equity investments trading still held at reporting date |  |  |  |  |  |  |  |  | $ 64,087 |  | $ 39,517
Net unrealized gains (losses) on equity investments trading still held at reporting date |  |  |  |  |  |  |  |  |  | $ (66,900) |

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