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INVENTORIES AND SUPPLIES (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Inventory Disclosure [Abstract] |  |
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

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