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Taxation (Income Tax Reconciliation) (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
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Expected income tax benefit (expense) |  |  |  |  |  |  |  |  | $ 25,489 | $ (22,874) | $ 17,697
Nondeductible expenses |  |  |  |  |  |  |  |  | 5,074 | (7,059) | (370)
Income tax audit adjustment |  |  |  |  |  |  |  |  | 3,424 | 0 | 0
Effect of change in tax rate |  |  |  |  |  |  |  |  | 3,055 | (262) | (708)
Tax exempt income |  |  |  |  |  |  |  |  | 218 | 400 | 944
Transfer pricing |  |  |  |  |  |  |  |  | 206 | 2,503 | (2,481)
GAAP to statutory accounting difference |  |  |  |  |  |  |  |  | 0 | 6,553 | 0
Non-taxable foreign exchange (losses) gains |  |  |  |  |  |  |  |  | (7) | (4) | 586
U.S. base erosion and anti-abuse tax |  |  |  |  |  |  |  |  | (36) | 0 | (1,271)
Withholding tax |  |  |  |  |  |  |  |  | (1,822) | (665) | (1,831)
Non-taxable loss on sale of RenaissanceRe UK |  |  |  |  |  |  |  |  | (6,091) | 0 | 0
Change in valuation allowance |  |  |  |  |  |  |  |  | (13,003) | (5,481) | (5,255)
Foreign branch adjustments |  |  |  |  |  |  |  |  | (17,821) | 7,315 | 0
Other |  |  |  |  |  |  |  |  | (1,548) | 2,359 | (1,009)
Income tax (expense) benefit | $ 9,923 | $ 8,244 | $ (29,875) | $ 8,846 | $ 3,455 | $ (3,664) | $ (9,475) | $ (7,531) | $ (2,862) | $ (17,215) | $ 6,302

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