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 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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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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Segment Information (Narrative) (Details) $ in Millions	12 Months Ended
Segment Information (Narrative) (Details) $ in Millions	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Segment Reporting Information [Line Items]
Reportable segments	2
Variable Interest Entity, Primary Beneficiary [Member]
Segment Reporting Information [Line Items]
Equity Method Investment, Ownership Percentage	75.00%
Revenue for reportable segment	$ 66.7	$ 57.3	$ 53.4
Frontier Pipeline [Member]
Segment Reporting Information [Line Items]
Equity Method Investment, Ownership Percentage	50.00%
Frontier Pipeline [Member]
Segment Reporting Information [Line Items]
Equity Method Investment, Ownership Percentage	50.00%
SLC Pipeline
Segment Reporting Information [Line Items]
Equity Method Investment, Ownership Percentage	25.00%