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Acquisition	12 Months Ended
Acquisition	Dec. 31, 2017
Business Combinations [Abstract]
Acquisition	Note 3—Acquisition Eclipse Resources-PA, LP Acquisition On January 18, 2018, the Company completed the purchase of approximately 44,500 net acres in Tioga and Potter Counties, Pennsylvania for an aggregate adjusted purchase price of $92.2 million, which was paid in approximately 37.8 million shares of common stock to Travis Peak Resources, LLC.