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INVENTORIES AND SUPPLIES
 12 Months Ended
Dec. 31, 2020
Inventory Disclosure [Abstract]  
INVENTORIES AND SUPPLIES INVENTORIES AND SUPPLIES
Inventories and supplies consisted of the following (in thousands):
December 31, 2020December 31, 2019
Oil and oil related products$76,209 $75,408 
Supplies and drums120,007 115,128 
Solvent and solutions8,812 9,973 
Other15,470 14,235 
Total inventories and supplies$220,498 $214,744 
Supplies and drums inventories consist primarily of drums and containers used in providing the Company's products and services, critical spare parts to support the Company's incinerator and re-refinery operations, and personal protective equipment. Other inventories consist primarily of parts washer components, cleaning fluids, absorbents and automotive fluids, such as windshield washer fluid and antifreeze.