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INVENTORIES AND SUPPLIES
 6 Months Ended
Jun. 30, 2022
Inventory Disclosure [Abstract]  
INVENTORIES AND SUPPLIES INVENTORIES AND SUPPLIES
Inventories and supplies consisted of the following (in thousands):
June 30, 2022December 31, 2021
Oil and oil related products$112,656 $101,965 
Supplies136,038 126,602 
Solvent and solutions11,304 8,099 
Other15,698 14,026 
Total inventories and supplies$275,696 $250,692 
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.