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Financial instruments by category - Income, expense, gains and losses on financial instruments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure Of Financial Assets And Financial Liabilities [Line Items]      
Interest income $ 11,230 $ 7,671 $ 8,201
Interest expense (52,308) (48,198) (49,491)
Foreign exchange gains/(losses) (38,708) (19,062) $ (23,423)
Loss from derivative financial instruments 38,679 (21,745)  
Net result (41,107) (81,334)  
Other financial liabilities at amortized cost      
Disclosure Of Financial Assets And Financial Liabilities [Line Items]      
Interest income 0 0  
Interest expense (10,340) (8,665)  
Foreign exchange gains/(losses) (13,672) (11,511)  
Loss from derivative financial instruments 0 0  
Net result (24,012) (20,176)  
Loans and receivables      
Disclosure Of Financial Assets And Financial Liabilities [Line Items]      
Interest income 11,230 7,671  
Interest expense (41,968) (39,533)  
Foreign exchange gains/(losses) (15,634) 4,737  
Loss from derivative financial instruments 0 0  
Net result (46,372) (27,125)  
Assets at fair value through profit or loss | Liabilities at fair value through profit or loss      
Disclosure Of Financial Assets And Financial Liabilities [Line Items]      
Interest income 0 0  
Interest expense 0 0  
Foreign exchange gains/(losses) (9,402) (12,288)  
Loss from derivative financial instruments 38,679 (21,745)  
Net result $ 29,277 $ (34,033)