Commitments and Contingencies (Details) $ in Thousands				3 Months Ended	9 Months Ended
	Jun. 16, 2016 USD ($)	Oct. 07, 2015 USD ($)	Apr. 05, 2011 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 06, 2016 contract	Dec. 31, 2015 USD ($)	Sep. 10, 2015 lawsuit	Jul. 15, 2013 plaintiff	Mar. 31, 2013 lawsuit
Commitments and Contingencies Disclosure
Estimated litigation claims included in reorganization items				$ 0	$ 20,478
Estimated litigation claims included in liabilities subject to compromise				24,500	24,500
Number of long-term executory contracts rejected | contract						9
Number of firm transportation service agreements rejected | contract						2
Net gain (loss) on rejection of contracts				(3,600)	(21,800)
Contract obligations subject to compromise				31,100	31,100
Shareholder Derivative Actions
Commitments and Contingencies Disclosure
Number of shareholder derivative actions claims filed | lawsuit										7
James Hart And Other Named Plaintiffs
Commitments and Contingencies Disclosure
Number of additional plaintiffs | plaintiff									15
Litigation reserve established							$ 5,100
Barton Gernandt Putative Class Action Lawsuit
Commitments and Contingencies Disclosure
Number of shareholder derivative actions claims filed | lawsuit								2
Pending Litigation | Shareholder Derivative Actions
Commitments and Contingencies Disclosure
Escrow fund amount established		$ 38,000
Wesley West Minerals, Ltd and Longfellow Ranch Partners, LP
Commitments and Contingencies Disclosure
Damages sought by plaintiff			$ 45,500
General Land Office of the State of Texas
Commitments and Contingencies Disclosure
Damages sought by plaintiff			$ 13,000
Securities and Exchange Commission
Commitments and Contingencies Disclosure
Proof of claim filed	$ 1,200
Litigation reserve				$ 1,400	$ 1,400