NET INCOME PER SHARE (Tables)

3 Months Ended

Mar. 31, 2018

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,
	2018	2017
Weighted-average number of basic common shares outstanding	48,349	49,192
Weighted-average dilutive stock options, restricted stock units and performance share units	282	227
Assumed conversion of Convertible Senior Notes	574	606
Weighted-average number of diluted common and common equivalent shares outstanding	49,205	50,025
Anti-dilutive potential common shares	1,432	2,256