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SHARE-BASED COMPENSATION PLANS - Schedule of Employee Stock Purchase Plan Activity (Details) - Employee Stock Purchase Plan - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]      
Shares purchased (in shares) 7,831 5,399 5,907
Weighted average price of shares purchased (in dollars per share) $ 14.85 $ 20.69 $ 23.04