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Tax - Reconciliation of Effective Tax Rate (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Reconciliation Of Effective Tax Rate [Abstract] |  |  |
Profit/(loss) before income tax | $ 6,733 | $ 9,354 | $ 105,430
Adjusted for tax effect of the following items |  |  |
Income in subsidiary, subject to income tax | 131 | 95 | 128
Total income tax expense | $ 131 | $ 95 | $ 128

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