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Financial risk management - Currency Appreciation/Depreciation Effects on Net Monetary Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic $ (587,462) $ (562,029)
US Dollar    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (600,680) (521,836)
Argentine Peso    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (282,129) (226,404)
Argentine Peso | US Dollar    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (260,372) (204,446)
Brazilian Reais    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (444,617) (479,100)
Brazilian Reais | US Dollar    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (480,501) (461,966)
Uruguay, Pesos    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 23,603 19,350
Uruguay, Pesos | US Dollar    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 24,512 20,451
US Dollar    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 115,681 124,125
US Dollar | US Dollar    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 115,681 124,125
Currency risk | US Dollar    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (71,636) (64,597)
Currency risk | Argentine Peso | US Dollar    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (26,037) (20,445)
Currency risk | Brazilian Reais | US Dollar    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (48,050) (46,197)
Currency risk | Uruguay, Pesos | US Dollar    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic $ 2,451 $ 2,045