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NET INCOME PER SHARE - Additional Information (Details) - shares
shares in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Earnings Per Share [Abstract]        
Employee stock options excluded from computation of diluted net income per share 0.4 0.2 0.3 0.4