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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Financial Assets And Financial Liabilities [Line Items]      
Interest income $ 7,319 $ 7,915 $ 11,230
Interest expense (60,134) (51,577) (52,308)
Foreign exchange gains/(losses) (108,458) (183,195) $ (38,708)
(Loss) / gain from derivative financial instruments (ii) 571 51,670  
Finance cost related to lease liabilities (9,524)    
Financial liabilities at amortized cost      
Disclosure Of Financial Assets And Financial Liabilities [Line Items]      
Interest income 0 0  
Interest expense (24,899) (15,783)  
Foreign exchange gains/(losses) (72,424) (33,041)  
(Loss) / gain from derivative financial instruments (ii) 0 0  
Finance cost related to lease liabilities 0    
Financial asset at amortized cost      
Disclosure Of Financial Assets And Financial Liabilities [Line Items]      
Interest income 7,319 7,915  
Interest expense (35,208) (35,794)  
Foreign exchange gains/(losses) (19,807) (108,936)  
(Loss) / gain from derivative financial instruments (ii) (870) 0  
Finance cost related to lease liabilities 0    
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 (27) 0  
Foreign exchange gains/(losses) (16,227) (41,218)  
(Loss) / gain from derivative financial instruments (ii) 1,441 $ 51,670  
Finance cost related to lease liabilities $ (9,524)