Description of Business and Presentation of Financial Statements (Details) $ in Millions	6 Months Ended
Jun. 30, 2015 USD ($) mi in	Dec. 31, 2014 USD ($)
Other Ownership Interests [Line Items]
Ownership percentage, controlling interest	39.00%
General partner interest	2.00%
Unamortized Debt Issuance Expense \| $	$ 4.7	$ 4.4
SLC Pipeline [Member]
Other Ownership Interests [Line Items]
Equity Method Investment, Ownership Percentage	25.00%
Crude Oil Pipeline, Length	95
UNEV Pipeline [Member]
Other Ownership Interests [Line Items]
Equity Method Investment, Ownership Percentage	75.00%
Crude Oil Pipeline, Length	427
Description Of Pipeline Acquired \| in	12

Crude Oil Pipeline, Length

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- Definition

Ownership Percentage by Parent, Controlling Interest

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- Definition

Pipeline, Size (Inches)

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- Definition

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

+ References

Reference 1: 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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Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 272

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.17)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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