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STOCK PLANS - Employee Stock Purchase Plan Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]      
Total number of shares purchased (in shares) 1,083 1,386 821
Average price paid per share (in USD per share) $ 47.31 $ 34.39 $ 47.60
Weighted-average fair value of each purchase right under the ESPP (in USD per share) $ 5.19 $ 3.82 $ 5.29