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INVENTORIES AND SUPPLIES (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Oil and oil related products $ 75,408 $ 70,823
Supplies and drums 115,128 104,609
Solvent and solutions 9,973 10,657
Other 14,235 13,390
Total inventories and supplies $ 214,744 $ 199,479