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Trade and other receivables, net - Carrying amounts of trade and other receivables (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Disclosure of financial assets [line items]    
Trade and other receivables $ 172,214 $ 174,940
US Dollar    
Disclosure of financial assets [line items]    
Trade and other receivables 50,400 54,012
Argentine Peso    
Disclosure of financial assets [line items]    
Trade and other receivables 48,911 45,641
Uruguay, Pesos    
Disclosure of financial assets [line items]    
Trade and other receivables 415 762
Brazilian Reais    
Disclosure of financial assets [line items]    
Trade and other receivables $ 72,488 $ 74,525