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Taxation (Income Tax Reconciliation) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Expected income tax (expense) benefit |  |  |  |  |  |  |  |  | $ (22,874) | $ 17,697 | $ 14,216
Nondeductible expenses |  |  |  |  |  |  |  |  | (7,059) | (370) | (276)
Change in valuation allowance |  |  |  |  |  |  |  |  | (5,481) | (5,255) | (11,718)
Withholding tax |  |  |  |  |  |  |  |  | (665) | (1,831) | (216)
Effect of change in tax rate |  |  |  |  |  |  |  |  | (262) | (708) | (38,083)
Non-taxable foreign exchange gains (losses) |  |  |  |  |  |  |  |  | (4) | 586 | 2,574
Tax exempt income |  |  |  |  |  |  |  |  | 400 | 944 | 3,794
Transfer pricing |  |  |  |  |  |  |  |  | 2,503 | (2,481) | (11)
GAAP to statutory accounting difference |  |  |  |  |  |  |  |  | 6,553 | 0 | 0
Foreign branch adjustments |  |  |  |  |  |  |  |  | 7,315 | 0 | 0
U.S. base erosion and anti-abuse tax |  |  |  |  |  |  |  |  | 0 | (1,271) | 0
Other |  |  |  |  |  |  |  |  | 2,359 | (1,009) | 3,233
Income tax (expense) benefit | $ 3,455 | $ (3,664) | $ (9,475) | $ (7,531) | $ 8,852 | $ (1,451) | $ (4,506) | $ 3,407 | $ (17,215) | $ 6,302 | $ (26,487)

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