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Financial instruments (Details 28) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Financial instruments [Line Items]    
Current financial assets at amortised cost $ 1,282,368 $ 1,534,588
Current, financial assets at fair value through profit or loss 2,610 19,801
Non-current financial assets at amortised cost 11,245 1,785
Non-current, financial assets at fair value through profit or loss 51,845 8,703
Financial assets at amortised cost 1,293,613 1,536,373
Total, financial assets at fair value through profit or loss 54,455 28,504
Cash and cash equivalent [Member]    
Financial instruments [Line Items]    
Current financial assets at amortised cost 509,102 588,530
Non-current financial assets at amortised cost 0 0
Financial assets at amortised cost 509,102 588,530
Trade receivables due from related parties at amortized cost [Member]    
Financial instruments [Line Items]    
Current financial assets at amortised cost 62,601 61,227
Non-current financial assets at amortised cost 0 0
Financial assets at amortised cost 62,601 61,227
Financial assets measured at amortized cost [member]    
Financial instruments [Line Items]    
Current financial assets at amortised cost 345,459 485,689
Non-current financial assets at amortised cost 80 75
Financial assets at amortised cost 345,539 485,764
Loans and receivables, category [member]    
Financial instruments [Line Items]    
Current financial assets at amortised cost 365,206 399,142
Non-current financial assets at amortised cost 11,165 1,710
Financial assets at amortised cost 376,371 400,852
Hedging assets [Member]    
Financial instruments [Line Items]    
Current, financial assets at fair value through profit or loss 0 17,270
Non-current, financial assets at fair value through profit or loss 37,276 3,918
Total, financial assets at fair value through profit or loss 37,276 21,188
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 14,569 4,785
Total, financial assets at fair value through profit or loss 14,569 4,785
Financial liabilities held for trading [Member]    
Financial instruments [Line Items]    
Current, financial assets at fair value through profit or loss 2,610 2,531
Non-current, financial assets at fair value through profit or loss 0 0
Total, financial assets at fair value through profit or loss 2,610 2,531
Total Financial Assets [Member]    
Financial instruments [Line Items]    
Current, total financial assets 1,284,978 1,554,389
Non-current, total financial assets 63,090 10,488
Total, total financial assets $ 1,348,068 $ 1,564,877