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Subsequent Events	3 Months Ended
Subsequent Events	Mar. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Divestitures. In April 2018, the sale of the West Eagle Ford Shale assets was completed, and during April 2018 the Company received the remaining cash proceeds of $81 million. Associated with the sale of the West Eagle Ford Shale assets, the Company expects to recognize a gain on unproved properties sold of $75 million to $85 million (after normal closing adjustments) during the second quarter of 2018. See Note 3 for additional information about the Company's sale of its West Eagle Ford Shale assets. Senior notes. The Company's outstanding 6.875% Senior Notes matured on May 1, 2018. The Company funded the payment of the $450 million principal balance with cash on hand. See Note 7 for additional information regarding the Company's 6.875% Senior Notes.