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FINANCING ARRANGEMENTS - Amortizing term loan (Details) - USD ($)
1 Months Ended 12 Months Ended
Nov. 30, 2020
Dec. 31, 2020
Dec. 31, 2021
Nov. 30, 2018
Debt Instrument        
Long-term debt, net of issuance costs   $ 30,321,000 $ 52,067,000  
Unamortized debt issuance costs   100,000 $ 225,000  
Medium-term Notes | Amortizing Term Loan        
Debt Instrument        
Loaned amount       $ 14,000,000
Debt instrument, term 36 months      
Long-term debt, net of issuance costs   $ 13,800,000    
Medium-term Notes | Reference Rate | Amortizing Term Loan        
Debt Instrument        
Variable rate (percent)   2.25%    
Effective interest rate (percent)   5.50%