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Major Customers and Concentration of Credit Risk (Details) (Revenues)	12 Months Ended
	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%

X

- Definition

Threshold percentage which the entity uses for disclosure.

+ References

No definition available.

+ Details

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X

- Details

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X

- 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

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