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COMMITMENTS AND CONTINGENCIES - Narrative (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2020
Loss Contingencies [Line Items]        
Asset retirement obligations       $ 800,000
Rochester, New Hampshire        
Loss Contingencies [Line Items]        
Environmental remediation expense $ 300,000 $ 100,000 $ 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)       $ 0
Environmental Contamination | Rochester, New Hampshire        
Loss Contingencies [Line Items]        
Environmental remediation expense   200,000    
Accrual for environmental liability, including revision (fully offset)   $ 0