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Financial risk management - Analysis of Borrowings after Interest Rate Swaps (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic $ (587,462) $ (562,029)  
Finance leases 595 105  
Total debt 862,116 817,958 $ 635,396
Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 861,521 817,853  
Finance leases 595 105  
Total debt 862,116 817,958  
Fixed interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 723,077 721,051  
Floating interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 138,444 96,802  
Argentine Peso      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic (21,757) (21,958)  
Argentine Peso | Fixed interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 2,320 6,448  
Brazilian Reais      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 35,884 (17,134)  
Brazilian Reais | Fixed interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 62,939 96,951  
Brazilian Reais | Floating interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 19,329 27,668  
US Dollar      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic (600,680) (521,836)  
US Dollar | Fixed interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 657,818 617,652  
US Dollar | Floating interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 119,115 69,134  
Argentine Peso      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic (282,129) (226,404)  
Argentine Peso | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 162,991 125,010  
Finance leases 595 105  
Total debt 163,586 125,115  
Argentine Peso | Fixed interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 51,538 75,411  
Argentine Peso | Floating interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 111,453 49,599  
Argentine Peso | Argentine Peso      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic (21,757) (21,958)  
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 2,320 6,448  
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 (260,372) (204,446)  
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 49,218 68,963  
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 111,453 49,599  
Brazilian Reais      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic (444,617) (479,100)  
Brazilian Reais | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 177,652 178,829  
Finance leases 0 0  
Total debt 177,652 178,829  
Brazilian Reais | Fixed interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 150,661 131,626  
Brazilian Reais | Floating interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 26,991 47,203  
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 35,884 (17,134)  
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 62,939 96,951  
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 19,329 27,668  
Brazilian Reais | US Dollar      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic (480,501) (461,966)  
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 87,722 34,675  
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 7,662 19,535  
Uruguay, Pesos      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 23,603 19,350  
Uruguay, Pesos | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 16,510 10,010  
Finance leases 0 0  
Total debt 16,510 10,010  
Uruguay, Pesos | Fixed interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 16,510 10,010  
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 24,512 20,451  
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 16,510 10,010  
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 115,681 124,125  
US Dollar | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 504,368 504,004  
Finance leases 0 0  
Total debt 504,368 504,004  
US Dollar | Fixed interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 504,368 504,004  
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 | 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 115,681 124,125  
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 504,368 504,004  
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