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Taxation (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2015
Operating Loss Carryforwards [Line Items] |  |  |  |
Change in valuation allowance | $ 900 | $ (43,800) | $ 5,600 |
Valuation allowance | 18,776 | 17,852 |  |
Income taxes paid (refunded) | (1,100) | 10,300 | 1,100 |
Unrecognized tax benefits | 0 | 0 |  |
Interest and penalties accrued on unrecognized tax benefits | 0 | $ 0 |  |
Internal Revenue Service (IRS) |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating loss carryforwards | 91,400 |  |  |
U.S. |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Valuation allowance |  |  | $ 48,500 | $ 1,000
Ireland |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating loss carryforwards | 10,400 |  |  |
U.K. |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating loss carryforwards | 90,900 |  |  |
Singapore |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating loss carryforwards | $ 7,600 |  |  |
U.S. | Internal Revenue Service (IRS) |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate, Dividend Withholding Tax, Percent | 5.00% |  |  |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 + Details
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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 + Details
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