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INVENTORIES AND SUPPLIES (Tables)
12 Months Ended
Dec. 31, 2018
Inventory Disclosure [Abstract]  
Schedule of Inventory
Inventories and supplies consisted of the following (in thousands):
 
December 31, 2018
 
December 31, 2017
Oil and oil related products
$
70,823

 
$
58,142

Supplies and drums
104,609

 
94,242

Solvent and solutions
10,657

 
9,167

Modular camp accommodations

 
1,826

Other
13,390

 
12,635

Total inventories and supplies
$
199,479

 
$
176,012