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INVENTORIES AND SUPPLIES
 12 Months Ended
Dec. 31, 2023
Inventory Disclosure [Abstract]  
INVENTORIES AND SUPPLIES INVENTORIES AND SUPPLIES
Inventories and supplies consisted of the following (in thousands):
December 31, 2023December 31, 2022
Oil and oil related products$118,600 $151,519 
Supplies177,217 143,743 
Solvent and solutions11,795 11,994 
Other19,899 17,738 
Total inventories and supplies$327,511 $324,994 
The balance of oil and oil related products has decreased due to lower volumes of base and blended oil on hand at December 31, 2023 when compared with December 31, 2022 and overall price decreases for the oil inventory and additives. Supplies inventories consist primarily of critical spare parts to support the Company's incinerator and re-refinery operations and other general supplies used in our normal day-to-day operations. Other inventories consist primarily of parts washer components, cleaning fluids, absorbents and automotive fluids, such as windshield washer fluid and antifreeze.