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NET INCOME PER SHARE (Details) - shares
shares in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Stock Options [Member]        
Net Income per Share [Abstract]        
Anti-dilutive shares excluded from calculation of diluted earnings per share (in shares) 0.5 0.2 0.9 0.4