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STOCK-BASED COMPENSATION - Restricted Stock Units Activity (Details) - Restricted Stock Units - $ / shares
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Restricted Stock Units      
Unvested, beginning (in shares) 1,815,415    
Granted (in shares) 877,501    
Vested (in shares) (863,827)    
Dividends reinvested (in shares) 177,266    
Cancelled/forfeited (in shares) (349,811)    
Unvested, ending (in shares) 1,656,544 1,815,415  
Weighted Average Grant Date Fair Value Per Unit      
Unvested, beginning (in dollars per share) $ 17.73    
Granted (in dollars per share) 15.55 $ 17.13 $ 20.59
Vested (in dollars per share) 18.46    
Dividends reinvested (in dollars per share) 17.70    
Cancelled/forfeited (in dollars per share) 16.60    
Unvested, ending (in dollars per share) $ 16.43 $ 17.73