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INVENTORIES AND SUPPLIES (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Inventory Disclosure [Abstract] |  |  |  |
Oil and oil related products |  | $ 58,142 | $ 52,158 |
Supplies and drums |  | 94,242 | 90,610 |
Solvent and solutions |  | 9,167 | 8,566 |
Modular camp accommodations |  | 1,826 | 15,255 |
Other |  | 12,635 | 11,839 |
Total inventories and supplies |  | 176,012 | 178,428 |
Transfer of inventory to property, plant and equipment | $ 12,600 | $ 12,641 | $ 0 | $ 0

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