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Investments (Schedule of Net Realized and Unrealized Gains (Losses) on Investments) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Gain (Loss) on Securities [Line Items] |  |  |
Net realized and unrealized gains (loss) on fixed maturity investments trading | $ (309,788) | $ 493,760 | $ 260,443
Net realized and unrealized gains (losses) on equity investments trading | 49,609 | 265,596 | 95,149
Net realized and unrealized gains (losses) on investments | (218,134) | 820,636 | 414,109
Fixed maturity investments |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Net realized gains (losses) on fixed maturity investments | 79,588 | 276,901 | 90,260
Net unrealized gains (losses) on fixed maturity investments trading | (389,376) | 216,859 | 170,183
Investments-related derivatives |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Net realized and unrealized gains (losses) on investments-related derivatives | (12,237) | 68,608 | 58,891
Equity investments |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Net realized gains (losses) on equity investments trading sold during the period | 335,491 | 3,532 | 31,062
Net unrealized gains (losses) on equity investments trading still held at reporting date | (285,882) | 262,064 | 64,087
Other Investments | Catastrophe bonds |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Net realized and unrealized gains (losses) | (35,033) | (7,031) | (9,392)
Other Investments | Other |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Net realized and unrealized gains (losses) | $ 89,315 | $ (297) | $ 9,018

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