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COMMITMENTS AND CONTINGENCIES - Narrative (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2018
Mar. 31, 2021
Loss Contingencies [Line Items]      
Asset retirement obligations     $ 800,000
Rochester, New Hampshire      
Loss Contingencies [Line Items]      
Expense associated with expected costs of site investigation $ 200,000 $ 100,000  
Capital expenditures   $ 200,000  
Accrual for environmental liability, including revision (fully offset)     0
Hoosick Falls, New York      
Loss Contingencies [Line Items]      
Accrual for environmental liability, including revision (fully offset)     $ 100,000