COMMITMENTS AND CONTINGENCIES (Accrued Environmental Remediation Costs) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Loss Contingencies [Line Items]
Accrued Environmental Remediation Costs	$ 36,545	$ 36,515	$ 36,819
Continuing Operations [Member]
Loss Contingencies [Line Items]
Accrued Environmental Remediation Costs	25,570	25,544	25,837
Retained From Former Chemicals Business [Member]
Loss Contingencies [Line Items]
Accrued Environmental Remediation Costs	$ 10,975	$ 10,971	$ 10,982