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Financial risk management - Analysis of Borrowings after Interest Rate Swaps (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic $ (562,029) $ (481,676)  
Finance leases 105 181  
Total debt 817,958 635,396 $ 723,339
Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 817,853 635,215  
Finance leases 105 181  
Total debt 817,958 635,396  
Fixed interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 721,051 214,571  
Floating interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 96,802 420,644  
Argentine Peso      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic (21,958) 1,518  
Argentine Peso | Fixed interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 6,448 1,005  
Brazilian Reais      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic (17,134) (203,070)  
Brazilian Reais | Fixed interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 96,951 131,495  
Brazilian Reais | Floating interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 27,668 65,408  
US Dollar      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic (521,836) (280,089)  
US Dollar | Fixed interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 617,652 82,071  
US Dollar | Floating interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 69,134 355,236  
Argentine Peso      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic (226,404) (42,570)  
Argentine Peso | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 125,010 64,747  
Finance leases 105 181  
Total debt 125,115 64,928  
Argentine Peso | Fixed interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 75,411 16,070  
Argentine Peso | Floating interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 49,599 48,677  
Argentine Peso | Argentine Peso      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic (21,958) 1,518  
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 6,448 1,005  
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 (204,446) (44,088)  
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 68,963 15,065  
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 49,599 48,677  
Brazilian Reais      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic (479,100) (510,158)  
Brazilian Reais | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 178,829 541,399  
Finance leases 0 0  
Total debt 178,829 541,399  
Brazilian Reais | Fixed interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 131,626 169,432  
Brazilian Reais | Floating interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 47,203 371,967  
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 (17,134) (203,070)  
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 96,951 131,495  
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 27,668 65,408  
Brazilian Reais | US Dollar      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic (461,966) (307,088)  
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 34,675 37,937  
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 19,535 306,559  
Uruguay, Pesos      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 19,350 (7,749)  
Uruguay, Pesos | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 10,010 29,069  
Finance leases 0 0  
Total debt 10,010 29,069  
Uruguay, Pesos | Fixed interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 10,010 29,069  
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 20,451 (7,714)  
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 10,010 29,069  
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 124,125 78,801  
US Dollar | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 504,004 0  
Finance leases 0 0  
Total debt 504,004 0  
US Dollar | Fixed interest rate | Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Risk exposure associated with instruments sharing characteristic 504,004 0  
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 124,125 78,801  
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 504,004 0  
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