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INVENTORIES AND SUPPLIES (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Inventory Disclosure [Abstract] |  |
Oil and oil products | $ 75,171 | $ 70,823
Supplies and drums | 112,220 | 104,609
Solvent and solutions | 9,905 | 10,657
Other | 13,531 | 13,390
Total inventories and supplies | $ 210,827 | $ 199,479

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