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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Financial Assets And Financial Liabilities [Line Items]      
Interest income $ 7,915 $ 11,230 $ 7,671
Interest expense (51,577) (52,308) (48,198)
Foreign exchange gains/(losses) (183,195) (38,708) $ (19,062)
Loss from derivative financial instruments 51,670 38,679  
Net result (175,187) (41,107)  
Financial liabilities at amortized cost      
Disclosure Of Financial Assets And Financial Liabilities [Line Items]      
Interest income 0 0  
Interest expense (15,783) (10,340)  
Foreign exchange gains/(losses) (33,041) (13,672)  
Loss from derivative financial instruments 0 0  
Net result (48,824) (24,012)  
Financial asset at amortized cost      
Disclosure Of Financial Assets And Financial Liabilities [Line Items]      
Interest income 7,915 11,230  
Interest expense (35,794) (41,968)  
Foreign exchange gains/(losses) (108,936) (15,634)  
Loss from derivative financial instruments 0 0  
Net result (136,815) (46,372)  
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) (41,218) (9,402)  
Loss from derivative financial instruments 51,670 38,679  
Net result $ 10,452 $ 29,277