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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, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net realized and unrealized gains (loss) on fixed maturity investments trading |  |  |  |  |  |  |  |  | $ 493,760 | $ 260,443 | $ (127,124)
Net realized and unrealized gains (losses) on equity investments trading |  |  |  |  |  |  |  |  | 265,596 | 95,149 | (39,161)
Net realized and unrealized gains (losses) on investments | $ 258,745 | $ 224,208 | $ 448,390 | $ (110,707) | $ 18,454 | $ 34,394 | $ 191,248 | $ 170,013 | 820,636 | 414,109 | (183,168)
Fixed maturity investments |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net realized gains (losses) on fixed maturity investments |  |  |  |  |  |  |  |  | 276,901 | 90,260 | (69,814)
Net unrealized gains (losses) on fixed maturity investments trading |  |  |  |  |  |  |  |  | 216,859 | 170,183 | (57,310)
Net realized and unrealized gains (losses) on investments |  |  |  |  |  |  |  |  | 820,636 |  |
Investments-related derivatives |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net realized and unrealized gains (losses) on investments-related derivatives |  |  |  |  |  |  |  |  | 68,608 | 58,891 | (8,784)
Equity investments |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net realized gains on equity investments trading sold during the period |  |  |  |  |  |  |  |  | 3,532 | 31,062 | 27,739
Net unrealized gains (losses) on equity investments trading still held at reporting date |  |  |  |  |  |  |  |  | 262,064 | 64,087 | (66,900)
Other Investments | Catastrophe bonds |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net realized and unrealized (losses) gains |  |  |  |  |  |  |  |  | (7,031) | (9,392) | (8,668)
Other Investments | Other |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net realized and unrealized (losses) gains |  |  |  |  |  |  |  |  | $ (297) | $ 9,018 | $ 569

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