RELATED PARTY TRANSACTIONS (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Blackstone and First Reserve [Member] | Series B Units [Member]
Related Party Transaction [Line Items]
Distributions to Series B Unitholders	$ 6,427
Fuel Strategies International, Inc, [Member]
Related Party Transaction [Line Items]
Charges incurred during period	646	903	462
Executive Chairman of the Board of Directors [Member]
Related Party Transaction [Line Items]
Charges incurred during period	$ 1,274	$ 1,030	$ 821