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INVENTORIES AND SUPPLIES (Tables)
6 Months Ended
Jun. 30, 2021
Inventory Disclosure [Abstract]  
Schedule of Inventories and Supplies
Inventories and supplies consisted of the following (in thousands):
June 30, 2021December 31, 2020
Oil and oil related products$75,162 $76,209 
Supplies119,388 120,007 
Solvent and solutions8,976 8,812 
Other12,199 15,470 
Total inventories and supplies$215,725 $220,498