NET INCOME PER SHARE (Tables)

3 Months Ended

Mar. 31, 2015

Earnings Per Share [Abstract]

Reconciliation of the weighted average number of shares outstanding used in calculating diluted earnings per share

A reconciliation of the weighted-average number of shares outstanding used in calculating diluted earnings per share is as follows (in thousands): 

	Three Months Ended March 31,
	2015	2014
Weighted-average number of basic common shares outstanding	51,909	52,153
Weighted-average dilutive stock options, restricted stock units and performance share units	257	317
Assumed conversion of Convertible Senior Notes	240	548
Weighted-average number of diluted common and common equivalent shares outstanding	52,406	53,018
Anti-dilutive potential common shares	2,616	2,069