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Financial risk management - Net Monetary Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic $ (904,683) $ (587,462)
Argentine Peso    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (20,293) (21,757)
Brazilian Reais    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (196,081) 35,884
US Dollar    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (686,223) (600,680)
Uruguay, Pesos    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (2,086) (909)
Argentine Peso    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (337,029) (282,129)
Argentine Peso | Argentine Peso    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (19,733) (21,757)
Argentine Peso | US Dollar    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (317,296) (260,372)
Brazilian Reais    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (634,685) (444,617)
Brazilian Reais | Brazilian Reais    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (196,081) 35,884
Brazilian Reais | US Dollar    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (438,604) (480,501)
Uruguay, Pesos    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 19,500 23,603
Uruguay, Pesos | US Dollar    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 21,586 24,512
Uruguay, Pesos | Uruguay, Pesos    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (2,086) (909)
US Dollar    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 47,531 115,681
US Dollar | Argentine Peso    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (560)  
US Dollar | US Dollar    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic $ 48,091 $ 115,681