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NET INCOME PER SHARE (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Earnings Per Share [Abstract]        
Weighted-average number of basic common shares outstanding (in shares) 40,922,000 43,251,000 41,007,000 44,124,000
Weighted-average dilutive stock options, restricted stock units and performance share units (in shares) 73,000 146,000 0 188,000
Assumed conversion of Convertible Senior Notes (in shares) 0 204,000 0 202,000
Weighted-average number of diluted common and common equivalent shares outstanding (in shares) 40,995,000 43,601,000 41,007,000 44,514,000
Anti-dilutive potential common shares (in shares) 334,000   166,000