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Acquisitions Pro Forma Infromation (Details) (USD $) | 3 Months Ended
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Mar. 31, 2012 | Mar. 31, 2013 Nettleton Pipeline [Member] | Mar. 31, 2013 Big Sandy Terminal [Member]
Business Acquisition [Line Items] |  |  |
Business Acquisition, Pro Forma Revenue | $ 239,213,000 |  |
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual |  | 1,800,000 | 400,000
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual |  | 1,400,000 | 300,000
Business Acquisition, Pro Forma Net Income (Loss) | $ 2,638,000 |  |

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