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Taxation - Tax loss carryforwards and corresponding jurisdictions (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
Argentina  
Disclosure Of Income Tax Jurisdiction [Line Items]  
Tax loss carry forward $ 80,988
Expiration period 5 years
Brazil  
Disclosure Of Income Tax Jurisdiction [Line Items]  
Tax loss carry forward $ 195,894
Uruguay  
Disclosure Of Income Tax Jurisdiction [Line Items]  
Tax loss carry forward $ 3,394
Expiration period 5 years
LUXEMBOURG  
Disclosure Of Income Tax Jurisdiction [Line Items]  
Tax loss carry forward $ 29,212