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Taxation (Income Tax Reconciliation) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |
Expected income tax benefit |  |  |  |  |  |  |  |  | $ 4,856 | $ 1,011 | $ 4,725
Tax exempt income |  |  |  |  |  |  |  |  | 4,487 | 4,939 | 671
Transaction costs |  |  |  |  |  |  |  |  | (131) | 3,654 | 0
Change in valuation allowance |  |  |  |  |  |  |  |  | (924) | 43,808 | (5,554)
Non-taxable foreign exchange (losses) gains |  |  |  |  |  |  |  |  | (1,126) | (1,897) | 885
Withholding tax |  |  |  |  |  |  |  |  | (2,578) | (3,036) | (327)
Other |  |  |  |  |  |  |  |  | (4,924) | (2,613) | (1,008)
Income tax (expense) benefit | $ 7,700 | $ 1,316 | $ (6,612) | $ (2,744) | $ (8,453) | $ 4,573 | $ 1,842 | $ 47,904 | $ (340) | $ 45,866 | $ (608)
Bermuda | Domestic Country |  |  |  |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |
Statutory income tax rate |  |  |  |  |  |  |  |  | 0.00% |  |
U.S. | Internal Revenue Service (IRS) |  |  |  |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |
Foreign statutory income tax rate |  |  |  |  |  |  |  |  | 35.00% |  |
Ireland | Foreign |  |  |  |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |
Foreign statutory income tax rate |  |  |  |  |  |  |  |  | 12.50% |  |
U.K. | Foreign |  |  |  |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |
Foreign statutory income tax rate |  |  |  |  |  |  |  |  | 20.00% |  |
Singapore | Foreign |  |  |  |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |
Foreign statutory income tax rate |  |  |  |  |  |  |  |  | 17.00% |  |

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