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Trade and other receivables, net - Carrying amounts of trade and other receivables (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Disclosure of financial assets [line items]    
Trade and other receivables $ 197,506 $ 172,214
US Dollar    
Disclosure of financial assets [line items]    
Trade and other receivables 52,342 50,400
Argentine Peso    
Disclosure of financial assets [line items]    
Trade and other receivables 42,896 48,911
Uruguay, Pesos    
Disclosure of financial assets [line items]    
Trade and other receivables 534 415
Brazilian Reais    
Disclosure of financial assets [line items]    
Trade and other receivables $ 101,734 $ 72,488