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Fresh-Start Accounting - Narrative (Details) $ in Thousands	Feb. 28, 2017 USD ($)
Reorganizations [Abstract]
Existing voting ownership interest, percentage of shares (less than)	50.00%
Enterprise value	$ 1,278,527
Proved and Unproved Reserves | Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.10
Proved and Unproved Reserves | Forward Curve Pricing
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.020

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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