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Taxation - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Income Tax Jurisdiction [Line Items]    
Gains (losses) before income tax of cash flow hedge $ 75,822 $ (565)
Reclassification from Equity to Income Statements (32,305) $ (20,758)
Tax losses for which no deferred income tax asset recognized 1,200  
Deferred tax asset carryforward $ 4,700  
Argentina    
Disclosure Of Income Tax Jurisdiction [Line Items]    
Operating loss carryforwards, expiration period 5 years  
Uruguay    
Disclosure Of Income Tax Jurisdiction [Line Items]    
Operating loss carryforwards, expiration period 5 years  
Brazil    
Disclosure Of Income Tax Jurisdiction [Line Items]    
Percentage of taxable profit that can be reduced by operating loss carryforwards (maximum) 30.00%