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INVENTORIES AND SUPPLIES (Tables)
9 Months Ended
Sep. 30, 2019
Inventory Disclosure [Abstract]  
Schedule of Inventory
Inventories and supplies consisted of the following (in thousands):
 
September 30, 2019
 
December 31, 2018
Oil and oil products
$
75,171

 
$
70,823

Supplies and drums
112,220

 
104,609

Solvent and solutions
9,905

 
10,657

Other
13,531

 
13,390

Total inventories and supplies
$
210,827

 
$
199,479