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Inventory (Notes)
6 Months Ended
Jun. 30, 2014
Inventory [Abstract]  
Inventory
Inventory
Inventories consisted of $24.8 million and $17.5 million of refined petroleum products as of June 30, 2014 and December 31, 2013, respectively. Cost of inventory is stated at the lower of cost or market, determined on a first-in, first-out basis.