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Investments (Schedule of Other Investments) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Schedule of Investments [Line Items] |  |  |
Other investments | $ 1,993,059 | $ 1,256,948 |
Initial commitments | 2,700,000 |  |
Fulfilled commitments | 1,300,000 |  |
Unfunded commitments | 1,400,000 |  |
Other Investments |  |  |
Schedule of Investments [Line Items] |  |  |
Net unrealized gain (loss) recognized in earnings due to change in estimate | 7,000 | (2,400) | $ (5,500)
Catastrophe bonds |  |  |
Schedule of Investments [Line Items] |  |  |
Other investments | $ 1,104,034 | 881,290 |
Catastrophe bonds | Low |  |  |
Schedule of Investments [Line Items] |  |  |
Maturity period | 1 year |  |
Catastrophe bonds | High |  |  |
Schedule of Investments [Line Items] |  |  |
Maturity period | 5 years |  |
Direct private equity investments |  |  |
Schedule of Investments [Line Items] |  |  |
Other investments | $ 88,373 | 79,807 |
Fund investments |  |  |
Schedule of Investments [Line Items] |  |  |
Other investments | 725,802 | 295,851 |
Term loans |  |  |
Schedule of Investments [Line Items] |  |  |
Other investments | $ 74,850 | $ 0 |

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