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Investments (Schedule of Net Realized and Unrealized Gains (Losses) on Investments) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Gain (Loss) on Securities [Line Items] |  |
Net realized and unrealized gains (losses) on investments | $ (673,017) | $ (345,563)
Fixed maturity investments |  |
Gain (Loss) on Securities [Line Items] |  |
Net realized gains (losses) on fixed maturity investments trading | (121,152) | 20,398
Net unrealized gains (losses) on fixed maturity investments trading | (464,177) | (297,018)
Net realized and unrealized gains (losses) on fixed maturity investments trading | (585,329) | (276,620)
Derivatives |  |
Gain (Loss) on Securities [Line Items] |  |
Net realized and unrealized gains (losses) on investments-related derivatives | (40,288) | 14,861
Equity investments |  |
Gain (Loss) on Securities [Line Items] |  |
Net realized gains (losses) on equity investments trading sold during the period | (20) | 109,887
Net unrealized gains (losses) on equity investments trading still held at reporting date | (48,669) | (177,809)
Net realized and unrealized gains (losses) on equity investments trading | (48,689) | (67,922)
Catastrophe bonds | Other investments |  |
Gain (Loss) on Securities [Line Items] |  |
Net realized and unrealized gains (losses) on other investments | (8,261) | (19,083)
Other | Other investments |  |
Gain (Loss) on Securities [Line Items] |  |
Net realized and unrealized gains (losses) on other investments | $ 9,550 | $ 3,201

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