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Taxation - Differences from theoretical amount that would arise from using the weighted average tax rate (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Taxes [Abstract]      
Tax calculated at the tax rates applicable to profits in the respective countries $ (1,937) $ (3,644) $ 3,842
Non-deductible items (1,406) (3,304) (133)
Non-deductible items – changes in estimates on previous year 0 (1,182) 0
Effect of the changes in the statutory income tax rate in Argentina 1,781 0 0
Unused tax losses (2,265) 0 0
Tax losses where no deferred tax asset was recognized (29) (569) (317)
Non-taxable income 2,437 0 4,625
Previously unrecognised tax losses now recouped to reduce tax expenses 7,595 0 0
Others (108) (688) (63)
Income tax benefit / (expense) $ 6,068 $ (9,387) $ 7,954