INVENTORIES AND SUPPLIES (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Inventory Disclosure [Abstract]
Oil and oil products	$ 67,005	$ 59,639
Supplies and drums	68,765	64,471
Solvent and solutions	9,282	10,100
Other	25,882	17,886
Total inventories and supplies	$ 170,934	$ 152,096