REMEDIAL LIABILITIES (Additional Information) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($) location
Site Contingency [Line Items]
Changes in estimates recorded to consolidated statement of operations	$ 4,130	$ (3,017)
Number of locations, accrual for environmental loss contingencies | location		5
Accrual for environmental loss contingencies	5.00%
Remedial Liabilities for Inactive Sites
Site Contingency [Line Items]
Increase in estimated remedial liability	$ 3,300
Changes in estimates recorded to consolidated statement of operations	2,873	$ (913)
Remedial Liabilities for Superfund Sites
Site Contingency [Line Items]
Increase in estimated remedial liability	$ 1,800