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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2013
Summary of Significant Accounting Policies |
Investments in entities accounted for under the equity method of accounting |
Entity |  | Type of Operation |  | Our Ownership Interest |
Settoon Towing, LLC |  | Barge Transportation Services |  | 50 | %
Eagle Ford Pipeline LLC |  | Crude Oil Pipeline |  | 50 | %
White Cliffs Pipeline, LLC |  | Crude Oil Pipeline |  | 36 | %
Frontier Pipeline Company |  | Crude Oil Pipeline |  | 22 | %
Butte Pipe Line Company |  | Crude Oil Pipeline |  | 22 | %

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- Definition Tabular disclosure of equity method investments including, but not limited to, name of each investee or group of investments, percentage ownership, difference between recorded amount of an investment and the value of the underlying equity in the net assets, and summarized financial information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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