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Taxation (Narrative) (Details) - USD ($) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 22, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2015 | Dec. 31, 2014
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Tax cuts and jobs act of 2017, incomplete accounting, change in tax rate, deferred tax asset, provisional income tax | $ 36,700,000 |  |  |  |  |
Change in valuation allowance |  | $ 11,200,000 | $ 900,000 | $ (43,800,000) |  |
Valuation allowance |  | 30,016,000 | 18,776,000 |  |  |
Income taxes paid (refunded) |  | 343,000 | (1,118,000) | $ 10,300,000 |  |
Unrecognized tax benefits |  | 0 | 0 |  |  |
Interest and penalties accrued on unrecognized tax benefits |  | $ 0 | $ 0 |  |  |
Internal Revenue Service (IRS) |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Expected tax rate |  | 5.00% |  |  |  |
Foreign statutory income tax rate |  | 35.00% |  |  |  |
Valuation allowance |  |  |  |  | $ 1,000,000 | $ 48,500,000
Operating loss carryforwards |  | $ 162,400,000 |  |  |  |
Domestic |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Statutory income tax rate |  | 0.00% |  |  |  |
U.K. |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Foreign statutory income tax rate |  | 19.30% |  |  |  |
Change in valuation allowance |  | $ 12,100,000 |  |  |  |
Operating loss carryforwards |  | $ 124,800,000 |  |  |  |
Singapore |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Foreign statutory income tax rate |  | 17.00% |  |  |  |
Operating loss carryforwards |  | $ 19,500,000 |  |  |  |
Ireland |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Foreign statutory income tax rate |  | 12.50% |  |  |  |
Operating loss carryforwards |  | $ 4,700,000 |  |  |  |

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