Subsequent Event

3 Months Ended

Sep. 30, 2011

Subsequent Event [Abstract]

Subsequent Events [Text Block]

Subsequent Event

On September 23, 2011, Enogex entered into the following agreements: an agreement with Cordillera, Oxbow and West Canadian Midstream pursuant to which Enogex agreed to acquire 100 percent of the membership interest in Roger Mills Gas Gathering, LLC, an Oklahoma limited liability company that owns an approximately 60-mile natural gas gathering system located in Roger Mills County and Ellis County, Oklahoma; an agreement with Cordillera and Oxbow pursuant to which Enogex agreed to acquire an approximately 30-mile natural gas gathering system located in Roger Mills County, Oklahoma; and an agreement with Cordillera pursuant to which Cordillera agreed to provide Enogex with long-term acreage dedication in the area served by the gathering systems encompassing approximately 100,000 net acres. The gathering systems are located in the Granite Wash area. The aggregate purchase price for these transactions was $200 million which was paid in cash primarily from contributions from OGE Energy and the ArcLight group (as discussed in Note 3) as well as cash generated from operations and bank borrowings. The transactions closed on November 1, 2011. The Company has not completed the appraisal and purchase price allocation for this transaction but expects to record a significant amount of goodwill and intangible assets as part of this transaction in the Gathering and Processing segment. All of the goodwill is expected to be deductible for tax purposes. Certain of the required accounting disclosures related to this transaction have been excluded from this Form 10-Q because it is impracticable to provide such disclosures when certain information is not yet available.