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EARNINGS PER SHARE - Potentially Anti-Dilutive Ordinary Shares Excluded from the Weight Average Number of Ordinary Shares for Diluted Earnings Per Share (Details) - shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Earnings per share [abstract]      
Shares deemed to be issued in respect of employee options excluded from calculation of EPS (in shares) 4,470 205,940 603,159