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Trade and other payables (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Subclassifications of assets, liabilities and equities [abstract]    
Payable from acquisition of property, plant and equipment $ 521 $ 1,042
Other payables 306 385
Trade and other payables, current 827 1,427
Trade payables 82,824 77,325
Advances from customers 6,722 7,758
Amounts due to related parties (Note 31) 628 1,152
Current income tax liabilities 6,462 4,685
Other payables 1,787 1,238
Trade and other payables, current 98,423 92,158
Trade and other payables $ 99,250 $ 93,585