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Major Customers and Concentration of Credit Risk (Details) (Revenues) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Minimum |  |  |
Major Customers and Concentration of Credit Risk |  |  |
Percentage required for qualification as major customer (as a percent) | 10.00% | 10.00% | 10.00%
Marathon Petroleum Corporation | Consolidated revenue |  |  |
Major Customers and Concentration of Credit Risk |  |  |
Percentage of major customer revenue (as a percent) | 16.00% | 16.00% | 14.00%
ConocoPhillips Company | Consolidated revenue |  |  |
Major Customers and Concentration of Credit Risk |  |  |
Percentage of major customer revenue (as a percent) |  | 10.00% | 10.00%

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- Definition Threshold percentage which the entity uses for disclosure. + References No definition available. + Details
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13537-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13531-108611 + Details
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