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Related parties - Remuneration (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Related Party [Abstract]    
Short-term employee benefits $ 5,214 $ 5,315
Post-employment benefits 583 650
Other long-term employee benefits 43 47
Share-based compensation expense 40,668 16,172
Total $ 46,508 $ 22,184