NET INCOME PER SHARE (Tables)

9 Months Ended

Sep. 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 September 30,		Nine Months Ended September 30,
	2016	2015	2016	2015
Weighted-average number of basic common shares outstanding	49,420	50,550	49,548	51,344
Weighted-average dilutive stock options, restricted stock units and performance share units	171	326	212	367
Assumed conversion of Convertible Senior Notes	384	254	288	241
Weighted-average number of diluted common and common equivalent shares outstanding	49,975	51,130	50,048	51,952
Anti-dilutive potential common shares	2,472	2,627	2,538	2,641