COMMITMENTS AND CONTINGENCIES (Changes in Environmental Liability) (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accrual for Environmental Loss Contingencies [Roll Forward]
Balances at the Beginning of the Period			$ 4,979	$ 12,770	$ 16,761
Additions to Accrual	$ 2,700	$ 2,900	5,600		7,700
Expenditures for Remediation			1,496	7,791	11,691
Balance at Period-end	$ 9,083		$ 9,083	$ 4,979	$ 12,770