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Financial instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Financial instruments [Line Items]    
Other non-current financial assets $ 51,925 $ 8,778
Other current financial assets 348,069 505,490
Hedging assets [Member]    
Financial instruments [Line Items]    
Other non-current financial assets 37,276 3,918
Other current financial assets 0 17,270
Financial assets at amortised cost, category [member]    
Financial instruments [Line Items]    
Other non-current financial assets 80 75
Other current financial assets 345,459 485,689
Financial assets at fair value through profit or loss, classified as held for trading, category [member]    
Financial instruments [Line Items]    
Other current financial assets 2,610 2,531
Financial assets measured at fair value through other comprehensive income, category [member]    
Financial instruments [Line Items]    
Other non-current financial assets $ 14,569 $ 4,785