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Earnings per share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement [Line Items]      
Net profit attributable to owners of the parent $ 278,115 $ 439,830 $ 427,697
Number of common shares in circulation 263,196,524 263,196,524 263,196,524
Basic earnings per share (US$ per share) $ 1.0567 $ 1.6711 $ 1.6250