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STOCK-BASED COMPENSATION PLANS - Summary (Details) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Restricted Stock Units        
Stock Appreciation Rights        
Outstanding (in units) 73,150      
Granted (in units) 550   73,700  
Outstanding (in units) 73,700   73,700  
Weighted Average Grant Date Assigned Value        
Outstanding (in dollars per unit) $ 19.03      
Granted (in dollars per unit) 12.71   $ 18.98  
Outstanding (in dollars per unit) $ 18.98   $ 18.98  
Restricted Stock Units | $12.71        
Stock Appreciation Rights        
Outstanding (in units) 550   550  
Weighted Average Grant Date Assigned Value        
Outstanding (in dollars per unit) $ 12.71   $ 12.71  
Weighted average remaining contractual term     7 months 6 days  
Restricted Stock Units | $19.03        
Stock Appreciation Rights        
Outstanding (in units) 73,150   73,150  
Weighted Average Grant Date Assigned Value        
Outstanding (in dollars per unit) $ 19.03   $ 19.03  
Weighted average remaining contractual term     3 years 6 months  
Stock Appreciation Rights        
Stock Appreciation Rights        
Outstanding (in units) 110,160 91,800 110,160 91,800
Granted (in units)      
Vested (in units)   (48,960)   (48,960)
Outstanding (in units) 110,160 42,840 110,160 42,840
Exercisable (in shares) 79,560   79,560  
Weighted Average Grant Date Assigned Value        
Outstanding (in dollars per unit) $ 16.32 $ 5.73 $ 16.32 $ 5.73
Vested (in dollars per unit)   4.21   4.21
Outstanding (in dollars per unit) $ 16.32 $ 7.46 $ 16.32 $ 7.46
Weighted average remaining contractual term     9 years 2 months 12 days