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Chapter 11 Proceedings and Ability to Continue as a Going Concern - Narrative (Details) - USD ($) |  |  |  |  | 1 Months Ended | 3 Months Ended
--- | --- | --- | --- | --- | --- | ---
Feb. 05, 2021 | Sep. 25, 2020 | Aug. 18, 2020 | Aug. 11, 2020 | Sep. 14, 2020 | Mar. 31, 2021
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Amount arranged |  | $ 500,000,000.0 |  | $ 500,000,000.0 |  |
Support of noteholders | 72.00% |  |  |  | 72.00% |
Emergence from chapter 11 extension period |  |  | 60 days |  |  |
Financing interest rate on borrowings outstanding, paid-in-kind |  |  |  | 8.00% |  |
Financing interest rate on borrowings outstanding, paid in cash |  | 7.00% |  |  |  |
Maximum cash disbursement |  | 15.00% |  |  |  |
Borrowings outstanding |  |  |  |  |  | $ 0
Shares to be allocated |  |  | 30.00% |  |  |
Plan of Reorganization, Support of Revolving Credit Facility, Percentage |  |  |  |  |  | 100.00%
Backstop commitment agreement, cash settlement |  |  | $ 520,000,000 |  |  |
Contractual interest expense |  |  |  |  |  | $ 100,300,000
Backstop commitment agreement, note issued |  |  | $ 550,000,000 |  |  |
Senior Noteholders |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Pro rata share |  |  | 39.00% |  |  |
Amount arranged |  |  |  | $ 550,000,000 |  |
Recovery of claims |  |  | 100.00% |  |  |
Shares to be allocated | 2.70% |  |  |  |  |
Lenders Under The Revolving Credit Facility |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Shares to be allocated | 2.427% |  |  |  |  |
Debtor-in-Possession Financing, Rights Offering |  |  | 14.00% |  |  |
Lenders Under The Revolving Credit Facility | Option One |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Pro rata share |  |  | 30.80% |  |  |
Lenders Under The Revolving Credit Facility | Option Two |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Pro rata share |  |  | 27.80% |  |  |
Senior Noteholders Participating In Rights Offering |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Pro rata share |  |  | 29.30% |  |  |
Senior Noteholder Who Agreed To Backstop The Rights Offering |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Pro rata share |  |  | 2.63% |  |  |
Amount arranged |  |  | $ 48,800,000 |  |  |
Holders Of Equity Interests |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Warrants term |  |  | 7 years |  |  |
Warrants for new equity |  |  | 7.00% |  |  |
Lenders under Revolving Credit Facility Participating in Rights Offering |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Pro rata share |  |  | 0.70% |  |  |
Lenders under Revolving Credit Facility Participating in Rights Offering | Option One |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Pro rata share |  |  | 5.30% |  |  |
Cash payment |  |  | $ 7,800,000 |  |  |
Plan of Reorganization, Share Percentage on New Secured Loans |  |  | 2.40% |  |  |
Lenders Under Revolving Credit Facility Not Participating in Rights Offering | Option Two |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Pro rata share |  |  | 23.00% |  |  |
Cash payment |  |  | $ 96,100,000 |  |  |
General Rights Offering |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Pro rata share |  |  | 97.60% |  |  |
Lenders Under Revolving Credit Facility Who Agreed to Backstop The Rights Offering |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Pro rata share |  |  | 0.07% |  |  |
Amount arranged |  |  | $ 1,200,000 |  |  |
Senior Notes |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Cash payment |  |  | 26,000,000 |  |  |
Backstop commitment agreement, premium |  |  | 50,000,000.0 |  |  |
Backstop commitment fee |  |  | $ 20,000,000.0 |  |  |
Senior Notes | 6.875% Senior notes due 2020 |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Interest rate on borrowings outstanding |  |  | 6.875% |  |  |
Senior Notes | 7.875% Senior notes due 2040 |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Interest rate on borrowings outstanding |  |  | 7.875% |  |  |
Senior Notes | 4.875% Senior notes due 2022 |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Interest rate on borrowings outstanding |  |  | 4.875% |  |  |
Senior Notes | 4.75% Senior notes due 2024 |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Interest rate on borrowings outstanding |  |  | 4.75% |  |  |
Senior Notes | 7.375% Senior notes due 2025 |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Interest rate on borrowings outstanding |  |  | 7.375% |  |  |
Senior Notes | 5.40% Senior notes due 2042 |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Interest rate on borrowings outstanding |  |  | 5.40% |  |  |
Senior Notes | 5.85% Senior notes due 2044 |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Interest rate on borrowings outstanding |  |  | 5.85% |  |  |
Senior Notes | First Lien Secured Notes |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Backstop commitment agreement, amount arranged |  |  | $ 187,500,000 |  |  |
Senior Notes | General Rights Offering |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Backstop commitment agreement, amount arranged | $ 50,000,000.0 |  | $ 312,500,000 |  |  |
Senior Notes | 7.20% Debentures due 2027 |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Interest rate on borrowings outstanding |  |  | 7.20% |  |  |
Revolving Credit Facility | Option One |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Cash payment |  |  | $ 45,000,000.0 |  |  |
Revolving Credit Facility | Option Two |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Cash payment |  |  | $ 116,200,000 |  |  |

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