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Inventory (Notes)
9 Months Ended
Sep. 30, 2013
Inventory Disclosure [Abstract]  
Inventory
Inventory
Inventories consisted of $21.2 million and $14.4 million of refined petroleum products as of September 30, 2013 and December 31, 2012, respectively. Cost of inventory is stated at the lower of cost or market, determined on a first-in, first-out basis.