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Summary of Significant Accounting Policies - Narrative (Details) - USD ($)	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2016	Oct. 01, 2016	Dec. 31, 2017	Dec. 31, 2015
Successor
Significant Accounting Policies [Line Items]
Allowance for doubtful accounts		$ 0
Capitalized costs	$ 38,062,000		$ 294,345,000
Maximum reserves sold from cost center not expected to result in significant alteration (less than)			25.00%
Natural gas balancing liability	1,700,000		$ 1,600,000
Successor | Internal Costs
Significant Accounting Policies [Line Items]
Capitalized costs	4,000,000.0		$ 14,800,000
Successor | Buildings and structures | Minimum
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life			10 years
Successor | Buildings and structures | Maximum
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life			39 years
Successor | Equipment | Minimum
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life			2 years
Successor | Equipment | Maximum
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life			30 years
Successor | Oil And Gas Unproved Properties
Significant Accounting Policies [Line Items]
Interest capitalized during period	0		$ 0
Successor | Oil, natural gas and NGL revenues
Significant Accounting Policies [Line Items]
Transportation costs	$ 7,400,000		$ 29,100,000
Predecessor
Significant Accounting Policies [Line Items]
Capitalized costs		156,954,000		$ 846,300,000
Predecessor | Internal Costs
Significant Accounting Policies [Line Items]
Capitalized costs		22,700,000		45,100,000
Predecessor | Oil And Gas Unproved Properties
Significant Accounting Policies [Line Items]
Interest capitalized during period		$ 2,200,000		10,800,000
Predecessor | Midstream And Corporate Assets
Significant Accounting Policies [Line Items]
Interest capitalized during period				$ 3,300,000
Predecessor | 8.125% Convertible Senior Notes due 2022
Significant Accounting Policies [Line Items]
Long-term debt, fixed interest rate				8.125%
Predecessor | 7.5% Convertible Senior Notes due 2023
Significant Accounting Policies [Line Items]
Long-term debt, fixed interest rate				7.50%
Predecessor | Secured Debt | 8.75% Senior Secured Notes due 2020
Significant Accounting Policies [Line Items]
Long-term debt, fixed interest rate		8.75%
Predecessor | Convertible Debt | 8.125% Convertible Senior Notes due 2022
Significant Accounting Policies [Line Items]
Long-term debt, fixed interest rate		8.125%
Predecessor | Convertible Debt | 7.5% Convertible Senior Notes due 2023
Significant Accounting Policies [Line Items]
Long-term debt, fixed interest rate		7.50%
Predecessor | Production expenses
Significant Accounting Policies [Line Items]
Transportation costs		$ 26,200,000		$ 45,300,000

X

- Definition

The maximum percentage of reserves from a cost center that if sold would not ordinarily be expected to result in a significant alteration.

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Significant Accounting Policies [Line Items]

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- Definition

For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
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Amount of costs incurred related to oil and gas property acquisition, exploration and development activities, including capitalized costs and costs charged to expense.

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X

- Definition

The value of gas balancing asset or liability as of the end of the period.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
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Amount of interest capitalized during the period.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Includes the cost to prepare and move liquid hydrocarbons and natural gas to their points of sale.

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