INVENTORIES AND SUPPLIES (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Jun. 30, 2017	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Inventory Disclosure [Abstract]
Oil and oil products		$ 57,602		$ 52,158
Supplies and drums		93,654		90,610
Solvent and solutions		8,680		8,566
Modular camp accommodations		1,945		15,255
Other		11,216		11,839
Total inventories and supplies		173,097		$ 178,428
Transfer of inventory to property, plant and equipment	$ 12,600	$ 12,641	$ 0