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Financial risk management - Floating Rate Risk Effects on Profit Before Income Tax (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of detailed information about financial instruments [line items]      
Profit / (Loss) before income tax $ 5,681 $ 13,126 $ (12,305)
Floating interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Profit / (Loss) before income tax (968) (4,207)  
Floating interest rate | Interest rate risk | Argentine Peso      
Disclosure of detailed information about financial instruments [line items]      
Profit / (Loss) before income tax (496) (487)  
Floating interest rate | Interest rate risk | Brazilian Reais      
Disclosure of detailed information about financial instruments [line items]      
Profit / (Loss) before income tax (472) (3,720)  
Floating interest rate | Interest rate risk | Uruguay, Pesos      
Disclosure of detailed information about financial instruments [line items]      
Profit / (Loss) before income tax 0 0  
Floating interest rate | Interest rate risk | US Dollar      
Disclosure of detailed information about financial instruments [line items]      
Profit / (Loss) before income tax 0 0  
Brazilian Reais | Floating interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Profit / (Loss) before income tax (277) (654)  
Brazilian Reais | Floating interest rate | Interest rate risk | Argentine Peso      
Disclosure of detailed information about financial instruments [line items]      
Profit / (Loss) before income tax 0 0  
Brazilian Reais | Floating interest rate | Interest rate risk | Brazilian Reais      
Disclosure of detailed information about financial instruments [line items]      
Profit / (Loss) before income tax (277) (654)  
Brazilian Reais | Floating interest rate | Interest rate risk | Uruguay, Pesos      
Disclosure of detailed information about financial instruments [line items]      
Profit / (Loss) before income tax 0 0  
Brazilian Reais | Floating interest rate | Interest rate risk | US Dollar      
Disclosure of detailed information about financial instruments [line items]      
Profit / (Loss) before income tax 0 0  
US Dollar | Floating interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Profit / (Loss) before income tax (691) (3,553)  
US Dollar | Floating interest rate | Interest rate risk | Argentine Peso      
Disclosure of detailed information about financial instruments [line items]      
Profit / (Loss) before income tax (496) (487)  
US Dollar | Floating interest rate | Interest rate risk | Brazilian Reais      
Disclosure of detailed information about financial instruments [line items]      
Profit / (Loss) before income tax (195) (3,066)  
US Dollar | Floating interest rate | Interest rate risk | Uruguay, Pesos      
Disclosure of detailed information about financial instruments [line items]      
Profit / (Loss) before income tax 0 0  
US Dollar | Floating interest rate | Interest rate risk | US Dollar      
Disclosure of detailed information about financial instruments [line items]      
Profit / (Loss) before income tax $ 0 $ 0