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INVENTORIES AND SUPPLIES (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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Inventory Disclosure [Abstract] |  |
Oil and oil related products | $ 77,117 | $ 75,408
Supplies and drums | 118,086 | 115,128
Solvent and solutions | 10,553 | 9,973
Other | 14,052 | 14,235
Total inventories and supplies | $ 219,808 | $ 214,744

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