Acquisitions - Schedule of Purchase Price (Details) - Cardinal Gas Storage Partners LLC - USD ($) $ in Thousands	Aug. 29, 2014	Aug. 28, 2014
Business Acquisition [Line Items]
Cash payment for 57.8% interest in Cardinal	$ 120,973
Fair value of the Partnership's previously owned 42.2% interest in Cardinal	87,613
Total	$ 208,586
Additional voting interests acquired (percentage)	57.80%
Ownership percentage by parent		42.20%

Business Acquisition, Percentage Of Additional Voting Interests Acquired

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Fair value at acquisition-date of the assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interests issued by the acquirer, including but not limited to, instruments or interests issued or issuable in consideration for the business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Fair value at acquisition-date of the equity interest in the acquiree held by the acquirer, immediately before the acquisition date for businesses combined in stages.

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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