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Financial instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Financial instruments [Line Items]      
Other non-current financial assets $ 8,778 $ 17,131 $ 0
Other current financial assets 505,490 312,721  
Hedging assets [Member]      
Financial instruments [Line Items]      
Other non-current financial assets 3,918 13,425  
Other current financial assets 17,270 18,238  
Financial assets at amortised cost, category [member]      
Financial instruments [Line Items]      
Other non-current financial assets 75 75  
Other current financial assets 485,689 291,790  
Financial assets at fair value through profit or loss, classified as held for trading, category [member]      
Financial instruments [Line Items]      
Other current financial assets 2,531 2,693  
Financial assets measured at fair value through other comprehensive income, category [member]      
Financial instruments [Line Items]      
Other non-current financial assets $ 4,785 $ 3,631