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INVENTORIES AND SUPPLIES (Tables)
3 Months Ended
Mar. 31, 2021
Inventory Disclosure [Abstract]  
Schedule of Inventories and Supplies
Inventories and supplies consisted of the following (in thousands):
March 31, 2021December 31, 2020
Oil and oil related products$76,106 $76,209 
Supplies120,814 120,007 
Solvent and solutions9,145 8,812 
Other13,434 15,470 
Total inventories and supplies$219,499 $220,498