NET INCOME PER SHARE (Tables)

3 Months Ended

Mar. 31, 2014

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,
	2014	2013
Weighted average number of basic common shares outstanding	52,153	49,939
Weighted average dilutive stock options, restricted stock units and performance share units	317	351
Assumed conversion of Convertible Senior Notes	548	1,063
Weighted average number of diluted common and common equivalent shares outstanding	53,018	51,353
Anti-dilutive potential common shares	2,069	2,196