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Financial instruments (Details 28) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Financial instruments [Line Items]    
Current financial assets at amortised cost $ 1,534,588 $ 1,357,265
Current, financial assets at fair value through profit or loss 19,801 20,931
Current, total financial assets 1,554,389 1,378,196
Non-current financial assets at amortised cost 1,785 2,350
Non-current, financial assets at fair value through profit or loss 8,703 17,056
Non-current, total financial assets 10,488 19,406
Financial assets at amortised cost 1,536,373 1,359,615
Total, financial assets at fair value through profit or loss 28,504 37,987
Total, total financial assets 485,689 1,397,602
Cash and cash equivalent [Member]    
Financial instruments [Line Items]    
Current financial assets at amortised cost 588,530 556,066
Non-current financial assets at amortised cost 0 0
Financial assets at amortised cost 588,530 556,066
Trade receivables due from related parties [Member]    
Financial instruments [Line Items]    
Current financial assets at amortised cost 61,227 42,790
Non-current financial assets at amortised cost 0 0
Financial assets at amortised cost 61,227 42,790
Term deposits [Member]    
Financial instruments [Line Items]    
Current financial assets at amortised cost 485,689 291,790
Non-current financial assets at amortised cost 75 75
Financial assets at amortised cost 485,764 291,865
Loans and receivables, category [member]    
Financial instruments [Line Items]    
Current financial assets at amortised cost 399,142 466,619
Non-current financial assets at amortised cost 1,710 2,275
Financial assets at amortised cost 400,852 468,894
Hedging assets [Member]    
Financial instruments [Line Items]    
Current, financial assets at fair value through profit or loss 17,270 18,238
Non-current, financial assets at fair value through profit or loss 3,918 13,425
Total, financial assets at fair value through profit or loss 21,188 31,663
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 2,531 2,693
Non-current, financial assets at fair value through profit or loss 0 0
Total, financial assets at fair value through profit or loss 2,531 2,693
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 4,785 3,631
Total, financial assets at fair value through profit or loss $ 4,785 $ 3,631