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Subsequent Events	9 Months Ended
Subsequent Events	Sep. 30, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On August 7, 2018, we granted a third party a time-limited option to acquire certain of our Powder River Basin midstream assets in exchange for an option payment of $30 million. We classified the property, plant, and equipment related to these assets, in the amount of $255.5 million, as current assets held for sale on our Unaudited Consolidated Balance Sheet as of September 30, 2018. Additionally, we had $1.1 million included in accounts receivable and $2.7 million included in current liabilities in the Unaudited Consolidated Balance Sheet as of September 30, 2018 related to these assets. On October 11, 2018, we completed the divestiture of our Powder River Basin midstream assets and received total net proceeds of approximately $300 million inclusive of the $30 million option payment.