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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, 2020
Dec. 31, 2019
Dec. 31, 2018
 [1]
Disclosure of detailed information about financial instruments [line items]      
Profit / (Loss) before income tax $ 13,395 $ 21,162 [1] $ (24,257)
Floating interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Profit / (Loss) before income tax (2,534) (998)  
Floating interest rate | Interest rate risk | Argentine Peso      
Disclosure of detailed information about financial instruments [line items]      
Profit / (Loss) before income tax (666) (793)  
Floating interest rate | Interest rate risk | Brazilian Reais      
Disclosure of detailed information about financial instruments [line items]      
Profit / (Loss) before income tax (1,868) (205)  
Floating interest rate | Interest rate risk | Uruguayan Peso      
Disclosure of detailed information about financial instruments [line items]      
Profit / (Loss) before income tax 0 0  
Floating interest rate | Interest rate risk | U.S. 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 (1,841) (136)  
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 (1,841) (136)  
Brazilian Reais | Floating interest rate | Interest rate risk | Uruguayan 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 | U.S. Dollar      
Disclosure of detailed information about financial instruments [line items]      
Profit / (Loss) before income tax 0 0  
U.S. Dollar | Floating interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Profit / (Loss) before income tax (693) (862)  
U.S. Dollar | Floating interest rate | Interest rate risk | Argentine Peso      
Disclosure of detailed information about financial instruments [line items]      
Profit / (Loss) before income tax (666) (793)  
U.S. Dollar | Floating interest rate | Interest rate risk | Brazilian Reais      
Disclosure of detailed information about financial instruments [line items]      
Profit / (Loss) before income tax (27) (69)  
U.S. Dollar | Floating interest rate | Interest rate risk | Uruguayan Peso      
Disclosure of detailed information about financial instruments [line items]      
Profit / (Loss) before income tax 0  
U.S. Dollar | Floating interest rate | Interest rate risk | U.S. Dollar      
Disclosure of detailed information about financial instruments [line items]      
Profit / (Loss) before income tax $ 0 $ 0  
[1] Prior periods have been recast to reflect the Company's change in accounting policy for the reclassification within financial results as explained in Note 34.1.