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Financial risk management - Currency Appreciation/Depreciation Effects on 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)
U.S. Dollar    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (433,122) (686,223)
Argentine Peso    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (308,450) (337,029)
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 | 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
Currency risk | U.S. Dollar    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (48,024) (73,431)
Currency risk | Argentine Peso | U.S. Dollar    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (19,335) (31,730)
Currency risk | Brazilian Reais | U.S. Dollar    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (30,761) (43,860)
Currency risk | Uruguayan Peso | U.S. Dollar    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic $ 2,072 $ 2,159