NET (LOSS) INCOME PER SHARE (Schedule of Basic and Diluted Net Income Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share Reconciliation [Line Items]
Net (loss) income	$ (15,503)	$ 1,365
Basic net (loss) income per share:
Weighted-average common shares outstanding (in shares)	71,548	81,772
Basic net income per share attributable to common stockholders (in USD per share)	$ (0.22)	$ 0.02
Diluted net (loss) income per share:
Weighted-average common shares outstanding (in shares)	71,548	81,772
Number of shares used in diluted calculation (in shares)	71,548	85,087
Diluted net income per share attributable to common stockholders (in USD per share)	$ (0.22)	$ 0.02
Stock options
Diluted net (loss) income per share:
Incremental common shares (in shares)	0	2,537
Restricted stock units
Diluted net (loss) income per share:
Incremental common shares (in shares)	0	725
Employee stock purchase program
Diluted net (loss) income per share:
Incremental common shares (in shares)	0	53