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INVENTORIES AND SUPPLIES (Tables)
6 Months Ended
Jun. 30, 2014
Inventory Disclosure [Abstract]  
Schedule of Inventory
Inventories and supplies consisted of the following (in thousands):
 
June 30, 2014
 
December 31, 2013
Oil and oil products
$
62,563

 
$
59,639

Supplies and drums
72,172

 
64,471

Solvent and solutions
9,639

 
10,100

Other
17,418

 
17,886

Total inventories and supplies
$
161,792

 
$
152,096