NET INCOME PER SHARE (Tables)

3 Months Ended

Mar. 31, 2017

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,
	2017	2016
Weighted-average number of basic common shares outstanding	49,192	49,630
Weighted-average dilutive stock options, restricted stock units and performance share units	227	275
Assumed conversion of Convertible Senior Notes	606	224
Weighted-average number of diluted common and common equivalent shares outstanding	50,025	50,129
Anti-dilutive potential common shares	2,256	2,665