NET INCOME PER SHARE (Tables)

12 Months Ended

Dec. 31, 2020

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 net income per share is as follows (in thousands): 

	For the Year Ended December 31,
	2020	2019	2018
Weighted-average number of basic common shares outstanding	40,974	43,082	47,446
Weighted-average dilutive stock options, restricted stock units and performance share units	158	203	236
Assumed conversion of convertible senior notes	28	224	335
Weighted-average number of diluted common and common equivalent shares outstanding	41,160	43,509	48,017