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STOCK-BASED COMPENSATION PLANS - Summary (Details) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Restricted Stock Units        
Stock Appreciation Rights        
Outstanding (in units) 73,700      
Granted (in units)   73,700  
Outstanding (in units) 73,700   73,700  
Weighted Average Grant Date Assigned Value        
Outstanding (in dollars per unit) $ 18.98      
Granted (in dollars per unit)     $ 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     3 months 18 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 2 months 12 days  
Stock Appreciation Rights        
Stock Appreciation Rights        
Outstanding (in units) 110,160 42,840 110,160 91,800
Granted (in units) 110,160 110,160
Vested (in units)   (42,840)   (91,800)
Outstanding (in units) 110,160 110,160 110,160 110,160
Exercisable (in shares) 87,210   87,210  
Weighted Average Grant Date Assigned Value        
Outstanding (in dollars per unit) $ 16.32 $ 7.46 $ 16.32 $ 5.73
Granted (in dollars per unit)   16.32   16.32
Vested (in dollars per unit)   7.46   5.73
Outstanding (in dollars per unit) $ 16.32 $ 16.32 $ 16.32 $ 16.32
Weighted average remaining contractual term     8 years 10 months 24 days