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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The cash inflow to dispose of long-lived, physical assets and mineral interests in oil and gas properties used for normal oil and gas operations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Going Concern (Details) a in Thousands			9 Months Ended
Going Concern (Details) a in Thousands	Oct. 20, 2016 USD ($) a	Jun. 14, 2016 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Dec. 31, 2015
Debt Instrument [Line Items]
Long-term debt, gross			$ 1,428,000,000
Consolidated funded debt to consolidated EBITDA ratio		3.75
Proceeds from sale of property			$ 0	$ 11,643,000
Subsequent Event \| RSA
Debt Instrument [Line Items]
Percentage of common stock issued in reorganization	95.00%
Repayments of debt	$ 225,000,000
Acreage sold in agreement \| a	86
Subsequent Event \| RSA \| Appalachia regions of Pennsylvania and West Virginia
Debt Instrument [Line Items]
Minimum payment of net cash proceeds from the sale of properties	$ 150,000,000
Payment of excess net cash proceeds from sale of properties	85.00%
Minimum proceeds from sale property	$ 350,000,000
Subsequent Event \| Tug Hill \| Disposal Group, Disposed of by Sale
Debt Instrument [Line Items]
Proceeds from sale of property	$ 360,000,000
7 1⁄2% Senior Notes due 2022
Debt Instrument [Line Items]
Interest rate					7.50%
1.75% Senior Notes due 2017
Debt Instrument [Line Items]
Interest rate					1.75%
Revolving credit facility
Debt Instrument [Line Items]
Line of credit facility, minimum liquidity requirement		$ 125,000,000.0
Senior Notes \| 7 1⁄2% Senior Notes due 2022
Debt Instrument [Line Items]
Interest rate			7.50%
Senior Notes \| 7 1⁄2% Senior Notes due 2022 \| RSA
Debt Instrument [Line Items]
Interest rate			7.50%
Convertible Debt \| 1.75% Senior Notes due 2017
Debt Instrument [Line Items]
Interest rate			1.75%
Quarter ended June 30, 2016
Debt Instrument [Line Items]
Consolidated funded debt to consolidated EBITDA ratio		5.25
Quarter ending September 30, 2016
Debt Instrument [Line Items]
Consolidated funded debt to consolidated EBITDA ratio		6.50
Quarter ending December 31, 2016
Debt Instrument [Line Items]
Consolidated funded debt to consolidated EBITDA ratio		9.50
Thereafter
Debt Instrument [Line Items]
Consolidated funded debt to consolidated EBITDA ratio		3.75