INVENTORIES AND SUPPLIES (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Inventory Disclosure [Abstract]
Oil and oil related products	$ 52,158	$ 33,603
Supplies and drums	90,610	78,132
Solvent and solutions	8,566	8,868
Modular camp accommodations	15,255	15,126
Other	11,839	13,792
Total inventories and supplies	$ 178,428	$ 149,521