Commitments and Contingencies Disclosure [Line Items]

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Debtor Reorganization Items, Number of Firm Transportation Service Agreements Rejected

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Debtor Reorganization Items, Number of Long-term Executory Contracts Rejected

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Escrow Fund Amount Established Related To Litigation Settlement

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Liabilities Subject to Compromise, Contract Obligations

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Litigation, Incentive Awards, Maximum

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Litigation, Plaintiff Counsel Fees, Maximum

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Loss Contingency, Number Of Additional Plaintiffs

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Amount of bankruptcy claim filed with bankruptcy court.

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Amount of gain (loss) on rejection of leases and other executory contracts, reported as a reorganization item.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
-SubTopic 10
-Section 55
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-URI http://asc.fasb.org/extlink&oid=34712771&loc=d3e56145-112766

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Amount of expense for claims expected to be incurred by an entity in reorganization.

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The amount of the provision for expected and allowed claims included in liabilities subject to compromise.

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Amount of judgment or settlement awarded to (against) the entity in respect of litigation.

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The value (monetary amount) of the award the plaintiff seeks in the legal matter.

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Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

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Number of plaintiffs that have filed claims pertaining to a loss contingency.

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Number of pending claims pertaining to a loss contingency.

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Commitments and Contingencies (Details)				3 Months Ended	6 Months Ended
Commitments and Contingencies (Details)	Jun. 16, 2016 USD ($)	Oct. 07, 2015 USD ($)	Apr. 05, 2011 USD ($)	Jun. 30, 2016 USD ($) plaintiff	Jun. 30, 2016 USD ($)	Jun. 06, 2016 contract	Apr. 15, 2016 plaintiff	Dec. 31, 2015 USD ($)	Jul. 15, 2013 plaintiff	Mar. 31, 2013 claim
Commitments and Contingencies Disclosure [Abstract]
Estimated litigation claims included in reorganization items				$ 20,500,000	$ 20,478,000
Estimated litigation claims included in liabilities subject to compromise				24,500,000	24,500,000
Number of long-term executory contracts rejected \| contract						9
Number of firm transportation service agreements rejected \| contract						2
Rejection of executory contracts				18,200,000	18,161,000
Contract obligations subject to compromise				27,500,000	27,500,000
Shareholder Derivative Actions
Commitments and Contingencies Disclosure
Number of shareholder derivative actions claims filed \| claim										7
James Hart And Other Named Plaintiffs
Commitments and Contingencies Disclosure
Number of additional plaintiffs \| plaintiff									15
Litigation reserve established								$ 5,100,000
Anadarko Basin Oil and Gas Lease Antitrust Litigation
Commitments and Contingencies Disclosure
Number of additional plaintiffs \| plaintiff							9
Pending Litigation \| Shareholder Derivative Actions
Commitments and Contingencies Disclosure
Escrow fund amount established		$ 38,000,000
Settled Litigation \| Shareholder Derivative Actions
Commitments and Contingencies Disclosure
Settlement amount				500,000
Maximum plaintiff counsel fees				$ 120,000	120,000
Number of plaintiffs \| plaintiff				2
Maximum incentive awards				$ 15,000	$ 15,000
Wesley West Minerals, Ltd and Longfellow Ranch Partners, LP
Commitments and Contingencies Disclosure
Damages sought by plaintiff			$ 45,500,000
General Land Office of the State of Texas
Commitments and Contingencies Disclosure
Damages sought by plaintiff			$ 13,000,000
Securities and Exchange Commission
Commitments and Contingencies Disclosure
Proof of claim filed	$ 1,200,000