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Taxation (Income Tax Reconciliation) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Tax Disclosure [Abstract] |  |  |
Expected income tax benefit (expense) | $ 53,093 | $ 25,489 | $ (22,874)
Nondeductible expenses | (334) | 5,074 | (7,059)
Reinsurance adjustment | (4,604) | 0 | 0
Income tax audit adjustment | 0 | 3,424 | 0
Effect of change in tax rate | 14,904 | 3,055 | (262)
Transfer pricing | 224 | 206 | 2,503
GAAP to statutory accounting difference | 0 | 0 | 6,553
U.S. base erosion and anti-abuse tax | (1,725) | (36) | 0
Withholding tax | (1,013) | (1,822) | (665)
Non-taxable loss on sale of RenaissanceRe UK | 0 | (6,091) | 0
Change in valuation allowance | (42,819) | (13,003) | (5,481)
Foreign branch adjustments | (5,491) | (17,821) | 7,315
Other | (1,567) | (1,337) | 2,755
Income tax benefit (expense) | $ 10,668 | $ (2,862) | $ (17,215)

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