NET INCOME PER SHARE (Tables)

6 Months Ended

Jun. 30, 2016

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 June 30,		Six Months Ended June 30,
	2016	2015	2016	2015
Weighted-average number of basic common shares outstanding	49,604	51,589	49,617	51,748
Weighted-average dilutive stock options, restricted stock units and performance share units	167	229	230	273
Assumed conversion of Convertible Senior Notes	288	220	258	232
Weighted-average number of diluted common and common equivalent shares outstanding	50,059	52,038	50,105	52,253
Anti-dilutive potential common shares	2,591	2,775	2,566	2,769