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INVENTORIES AND SUPPLIES (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Inventory Disclosure [Abstract] |  |  |  |
Oil and oil products | $ 57,554 | $ 57,554 |  | $ 52,158
Supplies and drums | 92,995 | 92,995 |  | 90,610
Solvent and solutions | 8,575 | 8,575 |  | 8,566
Modular camp accommodations | 2,699 | 2,699 |  | 15,255
Other | 10,717 | 10,717 |  | 11,839
Total inventories and supplies | 172,540 | 172,540 |  | $ 178,428
Transfer of inventory to property, plant and equipment | $ 12,600 | $ 12,641 | $ 0 |

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