INVENTORIES AND SUPPLIES (Tables)

3 Months Ended

Mar. 31, 2018

Inventory Disclosure [Abstract]

Schedule of Inventory

Inventories and supplies consisted of the following (in thousands):

	March 31, 2018		December 31, 2017
Oil and oil products	$	59,243	$	58,142
Supplies and drums	97,246		94,242
Solvent and solutions	9,188		9,167
Modular camp accommodations	2,247		1,826
Other	13,514		12,635
Total inventories and supplies	$	181,438	$	176,012