Acquisitions SLC Pipeline Joint Venture (Details) (SLC Pipeline [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2011 mi	Mar. 01, 2009 mi
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	25.00%	25.00%
Crude Oil Pipeline, Length	95	95
Equity Method Investment, Aggregate Cost		$ 28.0
Contribution [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Aggregate Cost		25.5
Finder's Fee [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Aggregate Cost		$ 2.5

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 159

-Paragraph 18

-Subparagraph f

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 18

-Paragraph 20

-Subparagraph a (1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant