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Acquisitions Pro Forma Infromation (Details) (USD $) | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended
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Jun. 30, 2012 | Jun. 30, 2012 | Jun. 30, 2013 Nettleton Pipeline [Member] | Jun. 30, 2013 Nettleton Pipeline [Member] | Jun. 30, 2013 Big Sandy Terminal [Member] | Jun. 30, 2013 Big Sandy Terminal [Member]
Business Acquisition [Line Items] |  |  |  |  |  |
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual |  |  | $ 1,300,000 | $ 3,200,000 | $ 400,000 | $ 800,000
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual |  |  | 700,000 | 2,100,000 | 300,000 | 600,000
Business Acquisition, Pro Forma Revenue | 262,609,000 | 501,692,000 |  |  |  |
Business Acquisition, Pro Forma Net Income (Loss) | $ 2,563,000 | $ 5,063,000 |  |  |  |

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- Definition The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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