NET INCOME PER SHARE (Tables)

6 Months Ended

Jun. 30, 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 June 30,		Six Months Ended June 30,
	2018	2017	2018	2017
Weighted-average number of basic common shares outstanding	48,055	49,131	48,202	49,161
Weighted-average dilutive stock options, restricted stock units and performance share units	198	206	240	221
Assumed conversion of Convertible Senior Notes	297	719	435	667
Weighted-average number of diluted common and common equivalent shares outstanding	48,550	50,056	48,877	50,049
Anti-dilutive potential common shares	1,431	2,075	1,410	2,118