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NET INCOME PER SHARE
 3 Months Ended
Mar. 31, 2015
NET INCOME PER SHARE [Abstract]  
NET INCOME PER SHARE
2.NET INCOME PER SHARE

Net income per share is computed based on the weighted-average number of common shares outstanding during the periods presented. Additionally, diluted earnings per share data gives effect to all potentially dilutive common shares that were outstanding during the periods presented. For the three-month periods ended March 31, 2015 and 2014, stock options of  1.6 million and 2.0 million, respectively, were excluded from the calculation of diluted earnings per share because they were anti-dilutive.