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INVENTORIES AND SUPPLIES (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Inventory Disclosure [Abstract] |  |
Oil and oil products | $ 70,596 | $ 70,823
Supplies and drums | 108,713 | 104,609
Solvent and solutions | 10,173 | 10,657
Other | 13,849 | 13,390
Total inventories and supplies | $ 203,331 | $ 199,479

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