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Financial risk management - Net Monetary Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic $ (847,201) $ (904,683)
Argentine Peso    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (115,385) (20,293)
Brazilian Reais    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (298,039) (196,081)
U.S. Dollar    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (433,122) (686,223)
Uruguayan Peso    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (655) (2,086)
Argentine Peso    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (308,450) (337,029)
Argentine Peso | Argentine Peso    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (115,097) (19,733)
Argentine Peso | U.S. Dollar    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (193,353) (317,296)
Brazilian Reais    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (605,650) (634,685)
Brazilian Reais | Brazilian Reais    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (298,039) (196,081)
Brazilian Reais | U.S. Dollar    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (307,611) (438,604)
Uruguayan Peso    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 20,065 19,500
Uruguayan Peso | U.S. Dollar    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 20,720 21,586
Uruguayan Peso | Uruguayan Peso    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (655) (2,086)
U.S. Dollar    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 46,834 47,531
U.S. Dollar | Argentine Peso    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (288) (560)
U.S. Dollar | U.S. Dollar    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic $ 47,122 $ 48,091