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Financial risk management - Analysis of Borrowings after Interest Rate Swaps (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items]        
Risk exposure associated with instruments sharing characteristic $ (904,683)   $ (587,462)  
Finance leases   $ 595 595  
Total debt 968,280   862,116 $ 817,958
Interest rate risk        
Disclosure of detailed information about financial instruments [line items]        
Risk exposure associated with instruments sharing characteristic     861,521  
Finance leases     595  
Total debt 968,280   862,116  
Fixed interest rate | Interest rate risk        
Disclosure of detailed information about financial instruments [line items]        
Risk exposure associated with instruments sharing characteristic 868,460   723,077  
Floating interest rate | Interest rate risk        
Disclosure of detailed information about financial instruments [line items]        
Risk exposure associated with instruments sharing characteristic 99,820   138,444  
Argentine Peso        
Disclosure of detailed information about financial instruments [line items]        
Risk exposure associated with instruments sharing characteristic (20,293)   (21,757)  
Argentine Peso | Fixed interest rate | Interest rate risk        
Disclosure of detailed information about financial instruments [line items]        
Risk exposure associated with instruments sharing characteristic 549   2,320  
Brazilian Reais        
Disclosure of detailed information about financial instruments [line items]        
Risk exposure associated with instruments sharing characteristic (196,081)   35,884  
Brazilian Reais | Fixed interest rate | Interest rate risk        
Disclosure of detailed information about financial instruments [line items]        
Risk exposure associated with instruments sharing characteristic 142,142   62,939  
Brazilian Reais | Floating interest rate | Interest rate risk        
Disclosure of detailed information about financial instruments [line items]        
Risk exposure associated with instruments sharing characteristic 13,604   19,329  
US Dollar        
Disclosure of detailed information about financial instruments [line items]        
Risk exposure associated with instruments sharing characteristic (686,223)   (600,680)  
US Dollar | Fixed interest rate | Interest rate risk        
Disclosure of detailed information about financial instruments [line items]        
Risk exposure associated with instruments sharing characteristic 725,769   657,818  
US Dollar | Floating interest rate | Interest rate risk        
Disclosure of detailed information about financial instruments [line items]        
Risk exposure associated with instruments sharing characteristic 86,216   119,115  
Argentine Peso        
Disclosure of detailed information about financial instruments [line items]        
Risk exposure associated with instruments sharing characteristic (337,029)   (282,129)  
Argentine Peso | Interest rate risk        
Disclosure of detailed information about financial instruments [line items]        
Risk exposure associated with instruments sharing characteristic     162,991  
Finance leases     595  
Total debt 208,352   163,586  
Argentine Peso | Fixed interest rate | Interest rate risk        
Disclosure of detailed information about financial instruments [line items]        
Risk exposure associated with instruments sharing characteristic 129,013   51,538  
Argentine Peso | Floating interest rate | Interest rate risk        
Disclosure of detailed information about financial instruments [line items]        
Risk exposure associated with instruments sharing characteristic 79,339   111,453  
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 | Argentine Peso | Fixed interest rate | Interest rate risk        
Disclosure of detailed information about financial instruments [line items]        
Risk exposure associated with instruments sharing characteristic 549   2,320  
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 | US Dollar        
Disclosure of detailed information about financial instruments [line items]        
Risk exposure associated with instruments sharing characteristic (317,296)   (260,372)  
Argentine Peso | US Dollar | Fixed interest rate | Interest rate risk        
Disclosure of detailed information about financial instruments [line items]        
Risk exposure associated with instruments sharing characteristic 128,464   49,218  
Argentine Peso | US Dollar | Floating interest rate | Interest rate risk        
Disclosure of detailed information about financial instruments [line items]        
Risk exposure associated with instruments sharing characteristic 79,339   111,453  
Brazilian Reais        
Disclosure of detailed information about financial instruments [line items]        
Risk exposure associated with instruments sharing characteristic (634,685)   (444,617)  
Brazilian Reais | Interest rate risk        
Disclosure of detailed information about financial instruments [line items]        
Risk exposure associated with instruments sharing characteristic     177,652  
Finance leases     0  
Total debt 240,001   177,652  
Brazilian Reais | Fixed interest rate | Interest rate risk        
Disclosure of detailed information about financial instruments [line items]        
Risk exposure associated with instruments sharing characteristic 219,520   150,661  
Brazilian Reais | Floating interest rate | Interest rate risk        
Disclosure of detailed information about financial instruments [line items]        
Risk exposure associated with instruments sharing characteristic 20,481   26,991  
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 (196,081)   35,884  
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 142,142   62,939  
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 13,604   19,329  
Brazilian Reais | US Dollar        
Disclosure of detailed information about financial instruments [line items]        
Risk exposure associated with instruments sharing characteristic (438,604)   (480,501)  
Brazilian Reais | US Dollar | Fixed interest rate | Interest rate risk        
Disclosure of detailed information about financial instruments [line items]        
Risk exposure associated with instruments sharing characteristic 77,378   87,722  
Brazilian Reais | US Dollar | Floating interest rate | Interest rate risk        
Disclosure of detailed information about financial instruments [line items]        
Risk exposure associated with instruments sharing characteristic 6,877   7,662  
Uruguay, Pesos        
Disclosure of detailed information about financial instruments [line items]        
Risk exposure associated with instruments sharing characteristic 19,500   23,603  
Uruguay, Pesos | Interest rate risk        
Disclosure of detailed information about financial instruments [line items]        
Risk exposure associated with instruments sharing characteristic     16,510  
Finance leases     0  
Total debt 15,113   16,510  
Uruguay, Pesos | Fixed interest rate | Interest rate risk        
Disclosure of detailed information about financial instruments [line items]        
Risk exposure associated with instruments sharing characteristic 15,113   16,510  
Uruguay, Pesos | Floating interest rate | Interest rate risk        
Disclosure of detailed information about financial instruments [line items]        
Risk exposure associated with instruments sharing characteristic 0   0  
Uruguay, Pesos | 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  
Uruguay, Pesos | 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  
Uruguay, Pesos | 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  
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 | US Dollar | Fixed interest rate | Interest rate risk        
Disclosure of detailed information about financial instruments [line items]        
Risk exposure associated with instruments sharing characteristic 15,113   16,510  
Uruguay, Pesos | US 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  
US Dollar        
Disclosure of detailed information about financial instruments [line items]        
Risk exposure associated with instruments sharing characteristic 47,531   115,681  
US Dollar | Interest rate risk        
Disclosure of detailed information about financial instruments [line items]        
Risk exposure associated with instruments sharing characteristic     504,368  
Finance leases     0  
Total debt 504,814   504,368  
US Dollar | Fixed interest rate | Interest rate risk        
Disclosure of detailed information about financial instruments [line items]        
Risk exposure associated with instruments sharing characteristic 504,814   504,368  
US 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  
US Dollar | Argentine Peso        
Disclosure of detailed information about financial instruments [line items]        
Risk exposure associated with instruments sharing characteristic (560)      
US 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  
US 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  
US 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  
US Dollar | US Dollar        
Disclosure of detailed information about financial instruments [line items]        
Risk exposure associated with instruments sharing characteristic 48,091   115,681  
US Dollar | US Dollar | Fixed interest rate | Interest rate risk        
Disclosure of detailed information about financial instruments [line items]        
Risk exposure associated with instruments sharing characteristic 504,814   504,368  
US Dollar | US 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