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INVENTORIES AND SUPPLIES (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
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