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Taxation - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Income Tax Jurisdiction [Line Items]    
Gains (losses) before income tax of cash flow hedge $ (565) $ (67,683)
Reclassification from Equity to Income Statements (20,758) $ (85,214)
Tax losses where no deferred tax asset was recognized 18,000  
Unused tax losses    
Disclosure Of Income Tax Jurisdiction [Line Items]    
Deductible temporary differences for which no deferred tax asset is recognised $ 5,600  
Argentina    
Disclosure Of Income Tax Jurisdiction [Line Items]    
Applicable tax rate 35.00%  
Operating loss carryforwards, expiration period 5 years  
Uruguay    
Disclosure Of Income Tax Jurisdiction [Line Items]    
Applicable tax rate 25.00%  
Operating loss carryforwards, expiration period 5 years  
Brazil    
Disclosure Of Income Tax Jurisdiction [Line Items]    
Applicable tax rate 34.00%  
Percentage of taxable profit that can be reduced by operating loss carryforwards (maximum) 30.00%  
Years 2018 and 2019 | Argentina    
Disclosure Of Income Tax Jurisdiction [Line Items]    
Applicable tax rate 30.00%  
Applicable dividend tax rate 7.00%  
From years 2020 onwards | Argentina    
Disclosure Of Income Tax Jurisdiction [Line Items]    
Applicable tax rate 25.00%  
Applicable dividend tax rate 13.00%