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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items]      
Profit / (Loss) before income tax $ 21,162 $ (24,257) $ 9,983
Floating interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Profit / (Loss) before income tax (998) (1,385)  
Floating interest rate | Interest rate risk | Argentine Peso      
Disclosure of detailed information about financial instruments [line items]      
Profit / (Loss) before income tax (793) (1,115)  
Floating interest rate | Interest rate risk | Brazilian Reais      
Disclosure of detailed information about financial instruments [line items]      
Profit / (Loss) before income tax (205) (270)  
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 (136) (193)  
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 (136) (193)  
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 (862) (1,192)  
US Dollar | Floating interest rate | Interest rate risk | Argentine Peso      
Disclosure of detailed information about financial instruments [line items]      
Profit / (Loss) before income tax (793) (1,115)  
US Dollar | Floating interest rate | Interest rate risk | Brazilian Reais      
Disclosure of detailed information about financial instruments [line items]      
Profit / (Loss) before income tax (69) (77)  
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