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STOCK-BASED COMPENSATION PLANS - Summary (Details) - Stock Appreciation Rights - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Stock Appreciation Rights      
Outstanding (in units) 91,800 116,280 116,280
Granted (in units) 110,160    
Exercised (in units) (91,800) (24,480)
Outstanding (in units) 110,160 91,800 116,280
Exercisable (in shares) 79,560 91,800  
Weighted Average Grant Date Assigned Value      
Outstanding (in dollars per unit) $ 5.73 $ 5.66 $ 5.66
Granted (in dollars per unit) 16.32    
Exercised (in dollars per unit) 5.73 5.43
Outstanding (in dollars per unit) 16.32 5.73 $ 5.66
Exercisable (in dollars per unit) $ 16.32 $ 5.73  
Weighted average remaining contractual term 9 years 8 months 12 days