OTHER NON-CURRENT ASSETS (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Right of use lease assets (see Note 9)	$ 143,608	$ 0
Debt issuance costs	1,612	2,216
Insurance receivables related to environmental remediation reserves	1,499	2,057
Derivative assets	138	1,003
Other	21,966	35,862
Total other non-current assets	$ 168,823	$ 41,138