ACCRUED AND OTHER CURRENT LIABILITIES (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Accrued Liabilities and Other Liabilities [Abstract]
Taxes - other than income	$ 29,644	$ 33,327
Accrued employee benefit liabilities	6,220	7,228
Accrued environmental remediation liabilities	11,658	9,242
Interest payable	58,360	57,164
Unearned revenue	31,593	34,734
Employee compensation related accruals	27,602	32,616
Accrued capital expenditures	59,128	48,690
ARO	0	1,255
Other	51,988	40,951
Total accrued and other current liabilities	$ 276,193	$ 265,207