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STOCK-BASED COMPENSATION PLANS - Long-term incentive program (Details) - USD ($)
$ in Millions
 12 Months Ended
May 17, 2017
May 14, 2014
May 25, 2011
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
May 18, 2022
Share-based arrangements with employees and non-employees              
Shares of common stock authorized for stock-based compensation plan (in shares)       4,000,000      
Additional shares of common stock authorized for stock-based compensation plan (in shares) 1,000,000 1,000,000 900,000        
Number of shares available for grant (in shares)       1,000,000     600,000
Nonqualified Stock Option              
Share-based arrangements with employees and non-employees              
Stock-based compensation expense       $ 2.9 $ 2.6 $ 2.7  
Income tax benefit       $ 0.7 $ 0.6 $ 0.7  
Stock Options              
Share-based arrangements with employees and non-employees              
Term of options       10 years      
Award vesting period       5 years      
Director's Stock Balance Plan | Nonqualified Stock Option              
Share-based arrangements with employees and non-employees              
Term of options       1 year      
Term of options in event of death       2 years