ACCRUED ENVIRONMENTAL REMEDIATION COSTS (Accrued Environmental Remediation Costs) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Loss Contingencies [Line Items]
Accrued Environmental Remediation Costs	$ 36,515	$ 41,401
Continuing Operations [Member]
Loss Contingencies [Line Items]
Accrued Environmental Remediation Costs	25,544	30,429
Retained From Former Chemicals Business [Member]
Loss Contingencies [Line Items]
Accrued Environmental Remediation Costs	$ 10,971	$ 10,972