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Taxation (Narrative) (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Dec. 22, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Operating Loss Carryforwards [Line Items] |  |  |  |
Partial write-down of U.S. deferred tax asset pursuant to the Tax Cuts and Jobs Act of 2017 | $ 36,700,000 |  |  |
Increase (decrease) in valuation allowance |  | $ 5,300,000 | $ (11,200,000) | $ (900,000)
Valuation allowance |  | 35,271,000 | 30,016,000 |
Income taxes paid (refunded) |  | 341,000 | 343,000 | $ (1,118,000)
Unrecognized tax benefits |  | 0 | 0 |
Interest and penalties accrued on unrecognized tax benefits |  | $ 0 | $ 0 |
Bermuda |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Statutory income tax rate |  | 0.00% |  |
Internal Revenue Service (IRS) |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Expected tax rate |  | 5.00% |  |
Foreign statutory income tax rate |  | 21.00% |  |
Operating loss carryforwards |  | $ 164,200,000 |  |
Ireland |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Foreign statutory income tax rate |  | 12.50% |  |
Operating loss carryforwards |  | $ 4,800,000 |  |
U.K. |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Foreign statutory income tax rate |  | 19.00% |  |
Increase (decrease) in valuation allowance |  | $ 4,000,000 |  |
Operating loss carryforwards |  | $ 114,400,000 |  |
Singapore |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Foreign statutory income tax rate |  | 17.00% |  |
Operating loss carryforwards |  | $ 21,700,000 |  |
Switzerland |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Foreign statutory income tax rate |  | 21.20% |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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