INVENTORIES AND SUPPLIES (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Inventory Disclosure [Abstract]
Oil and oil products	$ 59,294	$ 77,735
Supplies and drums	64,102	63,540
Solvent and solutions	11,441	9,398
Other	9,639	20,768
Total inventories and supplies	$ 144,476	$ 171,441