Major Customers (Details) (Customer Concentration Risk [Member], Sales Revenue, Net [Member], Western Refining, Inc. [Member])	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Western Refining, Inc. [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	98.10%	77.50%	98.00%	78.70%