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INVENTORIES AND SUPPLIES (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Oil and oil related products $ 77,808 $ 75,408
Supplies and drums 119,157 115,128
Solvent and solutions 10,290 9,973
Other 13,629 14,235
Total inventories and supplies $ 220,884 $ 214,744