INVENTORIES AND SUPPLIES (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Inventory Disclosure [Abstract]
Oil and oil products	$ 59,242	$ 59,639
Supplies and drums	65,882	64,471
Solvent and solutions	9,955	10,100
Other	17,364	17,886
Total inventories and supplies	$ 152,443	$ 152,096