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Financial risk management - Analysis of Borrowings after Interest Rate Swaps (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic $ (847,201) $ (904,683)  
Total debt 971,090 968,280 $ 862,116
Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Total debt 971,090 968,280  
Fixed interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 717,641 868,460  
Floating interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 253,449 99,820  
Argentine Peso      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic (115,385) (20,293)  
Argentine Peso | Fixed interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 81,283 549  
Brazilian Reais      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic (298,039) (196,081)  
Brazilian Reais | Fixed interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 22,834 142,142  
Brazilian Reais | Floating interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 184,123 13,604  
U.S. Dollar      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic (433,122) (686,223)  
U.S. Dollar | Fixed interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 613,524 725,769  
U.S. Dollar | Floating interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 69,326 86,216  
Argentine Peso      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic (308,450) (337,029)  
Argentine Peso | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Total debt 178,538 208,352  
Argentine Peso | Fixed interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 111,954 129,013  
Argentine Peso | Floating interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 66,584 79,339  
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 | Argentine Peso | Fixed interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 81,283 549  
Argentine Peso | Brazilian Reais | Fixed interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 0 0  
Argentine Peso | Brazilian Reais | Floating interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 0 0  
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)  
Argentine Peso | U.S. Dollar | Fixed interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 30,671 128,464  
Argentine Peso | U.S. Dollar | Floating interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 66,584 79,339  
Brazilian Reais      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic (605,650) (634,685)  
Brazilian Reais | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Total debt 285,291 240,001  
Brazilian Reais | Fixed interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 98,426 219,520  
Brazilian Reais | Floating interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 186,865 20,481  
Brazilian Reais | Argentine Peso | Fixed interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 0 0  
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 | Brazilian Reais | Fixed interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 22,834 142,142  
Brazilian Reais | Brazilian Reais | Floating interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 184,123 13,604  
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)  
Brazilian Reais | U.S. Dollar | Fixed interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 75,592 77,378  
Brazilian Reais | U.S. Dollar | Floating interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 2,742 6,877  
Uruguayan Peso      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 20,065 19,500  
Uruguayan Peso | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Total debt 2,002 15,113  
Uruguayan Peso | Fixed interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 2,002 15,113  
Uruguayan Peso | Floating interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 0 0  
Uruguayan Peso | Argentine Peso | Fixed interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 0 0  
Uruguayan Peso | Brazilian Reais | Fixed interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 0 0  
Uruguayan Peso | Brazilian Reais | Floating interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 0 0  
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 | U.S. Dollar | Fixed interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 2,002 15,113  
Uruguayan Peso | U.S. Dollar | Floating interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 0 0  
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 | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Total debt 505,259 504,814  
U.S. Dollar | Fixed interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 505,259 504,814  
U.S. Dollar | Floating interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 0 0  
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 | Argentine Peso | Fixed interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 0 0  
U.S. Dollar | Brazilian Reais | Fixed interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 0 0  
U.S. Dollar | Brazilian Reais | Floating interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 0 0  
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  
U.S. Dollar | U.S. Dollar | Fixed interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 505,259 504,814  
U.S. Dollar | U.S. Dollar | Floating interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic $ 0 $ 0