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Inventory (Notes)
3 Months Ended
Mar. 31, 2015
Inventory [Abstract]  
Inventory
Inventory
Inventories consisted of $4.5 million and $10.3 million of refined petroleum products as of March 31, 2015 and December 31, 2014, respectively. Cost of inventory is stated at the lower of cost or market, determined on a first-in, first-out basis.