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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Financial Assets And Financial Liabilities [Line Items]      
Interest income $ 4,084 $ 6,390 $ 7,728
Interest expense (58,282) (56,468) (47,266)
Foreign exchange gains/(losses) (109,266) (25,779) $ (68,787)
Loss from derivative financial instruments (8,228) 571  
Finance cost related to lease liabilities (12,532) (9,524)  
Financial liabilities at amortized cost      
Disclosure Of Financial Assets And Financial Liabilities [Line Items]      
Interest income 0 0  
Interest expense 0  
Foreign exchange gains/(losses) 0 0  
Loss from derivative financial instruments 0 0  
Finance cost related to lease liabilities 0 0  
Financial asset / liabilities at amortized cost      
Disclosure Of Financial Assets And Financial Liabilities [Line Items]      
Interest income 4,084 6,390  
Interest expense (58,282) (56,441)  
Foreign exchange gains/(losses) (109,266) (19,807)  
Loss from derivative financial instruments 0 (870)  
Finance cost related to lease liabilities (12,532) (9,524)  
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 (27)  
Foreign exchange gains/(losses) 0 (5,972)  
Loss from derivative financial instruments (8,228) 1,441  
Finance cost related to lease liabilities $ 0 $ 0