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Subsequent Events	6 Months Ended
Subsequent Events	Jun. 30, 2015
Subsequent Events [Abstract]
Subsequent Events	Note 17—Subsequent Events Investment in Piceance Energy On July 31, 2015, an unaffiliated third-party invested an aggregate $19 million in Piceance Energy in the form of cash and property. As a result of this transaction, our ownership interest decreased from 34.0% to 32.4%.