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Voluntary Reorganization under Chapter 11 of the Bankruptcy Code - Narrative (Details)	Sep. 29, 2020 USD ($)	Nov. 04, 2020	Nov. 02, 2020 conversionCondition	Oct. 02, 2020 USD ($)	Sep. 30, 2020
Debt Instrument [Line Items]
Reorganized Company's equity interests subject to Notes Claim	10000.00%
Term of warrants	4 years
Warrants equivalent of reorganized Company's equity interest if converted (percent)	750.00%
Subsequent Event
Debt Instrument [Line Items]
Number of voting classes | conversionCondition			3
Senior Notes
Debt Instrument [Line Items]
Consenting lenders' claim on outstanding debt (percent)	52.00%
Senior Notes | Subsequent Event
Debt Instrument [Line Items]
Consenting lenders' claim on outstanding debt (percent)		58.80%
6.50% senior unsecured notes due November 1, 2021 | Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as percent)					6.50%
6.875% senior unsecured notes due March 15, 2022 | Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as percent)					6.875%
2.625% senior unsecured convertible notes due September 15, 2023 | Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as percent)					2.625%
6.875% senior unsecured notes due January 15, 2023 | Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as percent)					6.875%
6.25% senior unsecured notes due May 1, 2026 | Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as percent)					6.25%
RBL | Credit Facility
Debt Instrument [Line Items]
Consenting lenders' claim on outstanding debt (percent)	97.00%
RBL | Credit Facility | Subsequent Event
Debt Instrument [Line Items]
Consenting lenders' claim on outstanding debt (percent)		100.00%
Senior Secured Superpriority Debtor-in-Possession Revolving Credit Agreement | Subsequent Event
Debt Instrument [Line Items]
Aggregate principal amount arranged				$ 450,000,000
Senior Secured Superpriority Debtor-in-Possession Revolving Credit Agreement | Revolving Credit Facility | Subsequent Event
Debt Instrument [Line Items]
Aggregate principal amount arranged				150,000,000
Initial financing available to the borrower				$ 120,000,000
Senior Secured Superpriority Debtor-in-Possession Revolving Credit Agreement | Letter of Credit | Subsequent Event
Debt Instrument [Line Items]
Stated interest rate (as percent)				5.50%
Capacity available for new issuances				$ 100,000,000
Initial financing available to the borrower				$ 80,000,000
Prepetition Secured Debt | Letter of Credit | Subsequent Event
Debt Instrument [Line Items]
Stated interest rate (as percent)				4.25%
Prepetition Secured Debt | Secured Debt | Subsequent Event
Debt Instrument [Line Items]
Aggregate principal amount arranged				$ 300,000,000
Initial financing available to the borrower				$ 240,000,000.0
Exit Facility | Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Aggregate principal amount arranged	$ 1,500,000,000
Initial financing available to the borrower	$ 575,000,000.0
Maturity term	3 years 6 months

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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