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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Financial Assets And Financial Liabilities [Line Items]      
Interest income $ 4,081 $ 4,084 $ 7,319
Interest expense (62,536) (58,282) $ (60,134)
Foreign exchange gains/(losses) 18,939 (109,266)  
Loss from derivative financial instruments (15,478) (8,228)  
Finance cost related to lease liabilities (16,502) (12,532)  
Financial asset / liabilities at amortized cost      
Disclosure Of Financial Assets And Financial Liabilities [Line Items]      
Interest income 4,081 4,084  
Interest expense (62,536) (58,282)  
Foreign exchange gains/(losses) 18,939 (109,266)  
Loss from derivative financial instruments 0 0  
Finance cost related to lease liabilities (16,502) (12,532)  
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) 0 0  
Loss from derivative financial instruments (15,478) (8,228)  
Finance cost related to lease liabilities $ 0 $ 0