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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, 2018
Dec. 31, 2017
Dec. 31, 2016
 [1]
Disclosure of detailed information about financial instruments [line items]      
(Loss) / Profit before income tax $ (24,257) $ 9,983 [1] $ 27,175
Floating interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
(Loss) / Profit before income tax (1,385) (968)  
Floating interest rate | Interest rate risk | Argentine Peso      
Disclosure of detailed information about financial instruments [line items]      
(Loss) / Profit before income tax (1,115) (496)  
Floating interest rate | Interest rate risk | Brazilian Reais      
Disclosure of detailed information about financial instruments [line items]      
(Loss) / Profit before income tax (270) (472)  
Floating interest rate | Interest rate risk | Uruguay, Pesos      
Disclosure of detailed information about financial instruments [line items]      
(Loss) / Profit before income tax 0 0  
Floating interest rate | Interest rate risk | US Dollar      
Disclosure of detailed information about financial instruments [line items]      
(Loss) / Profit before income tax 0 0  
Brazilian Reais | Floating interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
(Loss) / Profit before income tax (193) (277)  
Brazilian Reais | Floating interest rate | Interest rate risk | Argentine Peso      
Disclosure of detailed information about financial instruments [line items]      
(Loss) / Profit before income tax 0 0  
Brazilian Reais | Floating interest rate | Interest rate risk | Brazilian Reais      
Disclosure of detailed information about financial instruments [line items]      
(Loss) / Profit before income tax (193) (277)  
Brazilian Reais | Floating interest rate | Interest rate risk | Uruguay, Pesos      
Disclosure of detailed information about financial instruments [line items]      
(Loss) / Profit before income tax 0 0  
Brazilian Reais | Floating interest rate | Interest rate risk | US Dollar      
Disclosure of detailed information about financial instruments [line items]      
(Loss) / Profit before income tax 0 0  
US Dollar | Floating interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
(Loss) / Profit before income tax (1,192) (691)  
US Dollar | Floating interest rate | Interest rate risk | Argentine Peso      
Disclosure of detailed information about financial instruments [line items]      
(Loss) / Profit before income tax (1,115) (496)  
US Dollar | Floating interest rate | Interest rate risk | Brazilian Reais      
Disclosure of detailed information about financial instruments [line items]      
(Loss) / Profit before income tax (77) (195)  
US Dollar | Floating interest rate | Interest rate risk | Uruguay, Pesos      
Disclosure of detailed information about financial instruments [line items]      
(Loss) / Profit before income tax 0 0  
US Dollar | Floating interest rate | Interest rate risk | US Dollar      
Disclosure of detailed information about financial instruments [line items]      
(Loss) / Profit before income tax $ 0 $ 0  
[1] Prior periods have been recast to reflect the Company's change in accounting policy for Investment properties as described in Note 33.