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INVENTORIES AND SUPPLIES (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Oil and oil related products $ 76,563 $ 75,408
Supplies and drums 116,526 115,128
Solvent and solutions 9,763 9,973
Other 13,680 14,235
Total inventories and supplies $ 216,532 $ 214,744