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Trade and other payables (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Subclassifications of assets, liabilities and equities [abstract]    
Trade accounts payable $ 6,924 $ 13,181
Compensation payable 8,505 9,209
Other liabilities 5,327 2,491
Taxes payable 398 362
Trade and other payables $ 21,154 $ 25,243