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Financial instruments (Details 26) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Financial instruments [Line Items]    
Current financial assets at amortised cost $ 1,357,265 $ 1,497,386
Current, financial assets at fair value through profit or loss 20,931 6,038
Current, total financial assets 1,378,196 1,503,424
Non-current financial assets at amortised cost 2,350 1,957
Non-current, financial assets at fair value through profit or loss 17,056 42,834
Non-current, total financial assets 19,406 44,791
Financial assets at amortised cost 1,359,615 1,499,343
Total, financial assets at fair value through profit or loss 37,987 48,872
Total, total financial assets 291,790 163,269
Cash and cash equivalent [Member]    
Financial instruments [Line Items]    
Current financial assets at amortised cost 556,066 630,438
Non-current financial assets at amortised cost 0 0
Financial assets at amortised cost 556,066 630,438
Trade receivables due from related parties [Member]    
Financial instruments [Line Items]    
Current financial assets at amortised cost 44,554 59,132
Non-current financial assets at amortised cost 0 0
Financial assets at amortised cost 44,554 59,132
Total, total financial assets 44,554 59,132
Term deposits [Member]    
Financial instruments [Line Items]    
Current financial assets at amortised cost 291,790 360,941
Non-current financial assets at amortised cost 75 45
Financial assets at amortised cost 291,865 360,986
Loans and receivables, category [member]    
Financial instruments [Line Items]    
Current financial assets at amortised cost 464,855 446,875
Non-current financial assets at amortised cost 2,275 1,912
Financial assets at amortised cost 467,130 448,787
Hedging assets [Member]    
Financial instruments [Line Items]    
Current, financial assets at fair value through profit or loss 18,238 0
Non-current, financial assets at fair value through profit or loss 13,425 8,910
Total, financial assets at fair value through profit or loss 31,663 8,910
Total, total financial assets 18,238 0
Financial assets at fair value through profit or loss, classified as held for trading, category [member]    
Financial instruments [Line Items]    
Current, financial assets at fair value through profit or loss 2,693 6,038
Non-current, financial assets at fair value through profit or loss 0 0
Total, financial assets at fair value through profit or loss 2,693 6,038
Investments in equity instruments designated at fair value through other comprehensive income [member]    
Financial instruments [Line Items]    
Current, financial assets at fair value through profit or loss 0 0
Non-current, financial assets at fair value through profit or loss 3,631 33,924
Total, financial assets at fair value through profit or loss $ 3,631 $ 33,924