NET INCOME PER SHARE (Tables)

9 Months Ended

Sep. 30, 2015

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,
	2015	2014	2015	2014
Weighted-average number of basic common shares outstanding	50,550	52,405	51,344	52,319
Weighted-average dilutive stock options, restricted stock units and performance share units	326	272	367	308
Assumed conversion of Convertible Senior Notes	254	347	241	421
Weighted-average number of diluted common and common equivalent shares outstanding	51,130	53,024	51,952	53,048
Anti-dilutive potential common shares	2,627	2,628	2,641	2,577