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STOCK-BASED COMPENSATION PLANS - Summary (Details) - Performance Shares - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Units          
Outstanding (in units) 42,840 91,800 91,800 116,280  
Granted (in units) 110,160 110,160    
Exercised (in units) (42,840)   (91,800) (24,480)  
Outstanding (in units) 110,160 91,800 110,160 91,800  
Exercisable (in shares) 79,560   79,560   91,800
Weighted Average Grant Date Assigned Value          
Outstanding (in dollars per unit) $ 7.46 $ 5.73 $ 5.73 $ 5.66  
Granted (in dollars per unit) 25.75 25.75    
Exercised (in dollars per unit) 7.46   5.73 5.43  
Outstanding (in dollars per unit) 25.75 $ 5.73 25.75 $ 5.73  
Exercisable (in dollars per unit) $ 25.75   $ 25.75   $ 5.73