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Chapter 11 Proceedings and Ability to Continue as a Going Concern - Narrative (Details) - USD ($) |  |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Feb. 05, 2021 | Sep. 25, 2020 | Aug. 18, 2020 | Aug. 11, 2020 | Sep. 14, 2020 | Dec. 31, 2020
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Debtor-in-Possession Financing, Amount Arranged |  | $ 500,000,000.0 |  | $ 500,000,000.0 |  |
Plan Of Reorganization, Support Of Noteholders, Percentage |  |  |  |  | 72.00% |
Plan of Reorganization, Support of Revolving Credit Facility, Percentage |  |  |  |  |  | 100.00%
Plan Of Reorganization, Emergence From Chapter 11, Extension Period |  |  | 60 days |  |  |
Debtor-in-Possession, Financing Interest Rate On Borrowings Outstanding, Paid In Cash |  | 7.00% |  |  |  |
Debtor-in-Possession, Maximum Cash Disbursement, Percentage |  | 15.00% |  |  |  |
Debtor-in-Possession Financing, Borrowings Outstanding |  |  |  |  |  | $ 0
Backstop Commitment Agreement, Shares To Be Allocated |  |  | 30.00% |  |  |
Backstop Commitment Agreement, Cash Settlement |  |  | $ 520,000,000 |  |  |
Backstop Commitment Agreement, Note Issued |  |  | $ 550,000,000 |  |  |
Plan Of Reorganization, Legal And Other Professional Advisor Fees |  |  |  |  |  | 64,700,000
Contractual Interest Expense on Prepetition Liabilities Not Recognized in Statement of Operations |  |  |  |  |  | $ 140,700,000
Debtor-in-Possession, Financing Interest Rate On Borrowings Outstanding, Paid-in-Kind |  |  |  | 8.00% |  |
Subsequent Event |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Plan Of Reorganization, Support Of Noteholders, Percentage | 72.00% |  |  |  |  |
Senior Noteholders [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Plan Of Reorganization, Pro Rata Share Percentage |  |  | 39.00% |  |  |
Debtor-in-Possession Financing, Amount Arranged |  |  | $ 550,000,000 |  |  |
Plan Of Reorganization, Recovery Of Claims, Percentage |  |  | 100.00% |  |  |
Senior Noteholders [Member] | Subsequent Event |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Backstop Commitment Agreement, Shares To Be Allocated | 2.70% |  |  |  |  |
Lenders Under The Revolving Credit Facility [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Debtor-in-Possession Financing, Rights Offering |  |  | 14.00% |  |  |
Lenders Under The Revolving Credit Facility [Member] | Subsequent Event |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Backstop Commitment Agreement, Shares To Be Allocated | 2.427% |  |  |  |  |
Lenders Under The Revolving Credit Facility [Member] | Option One [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Plan Of Reorganization, Pro Rata Share Percentage |  |  | 30.80% |  |  |
Lenders Under The Revolving Credit Facility [Member] | Option Two [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Plan Of Reorganization, Pro Rata Share Percentage |  |  | 27.80% |  |  |
Lenders under Revolving Credit Facility Participating in Rights Offering [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Plan Of Reorganization, Pro Rata Share Percentage |  |  | 0.70% |  |  |
Lenders under Revolving Credit Facility Participating in Rights Offering [Member] | Option One [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Plan Of Reorganization, Pro Rata Share Percentage |  |  | 5.30% |  |  |
Debtor-in-Possession Financing, 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 [Member] | Option Two [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Plan Of Reorganization, Pro Rata Share Percentage |  |  | 23.00% |  |  |
Debtor-in-Possession Financing, Cash Payment |  |  | $ 96,100,000 |  |  |
Holders Of Equity Interests [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Plan Of Reorganization, Warrants Term |  |  | 7 years |  |  |
Plan Of Reorganization, Warrants For New Equity |  |  | 7.00% |  |  |
Senior Noteholders Who Agreed To Backstop The Rights Offering [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Plan Of Reorganization, Pro Rata Share Percentage |  |  | 2.63% |  |  |
Debtor-in-Possession Financing, Amount Arranged |  |  | $ 48,800,000 |  |  |
General Rights Offering [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Plan Of Reorganization, Pro Rata Share Percentage |  |  | 97.60% |  |  |
Senior Noteholders Participating In Rights Offering [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Plan Of Reorganization, Pro Rata Share Percentage |  |  | 29.30% |  |  |
Lenders Under Revolving Credit Facility Who Agreed to Backstop The Rights Offering [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Plan Of Reorganization, Pro Rata Share Percentage |  |  | 0.07% |  |  |
Debtor-in-Possession Financing, Amount Arranged |  |  | $ 1,200,000 |  |  |
Senior Notes [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Debtor-in-Possession Financing, Cash Payment |  |  | 26,000,000 |  |  |
Backstop Commitment Agreement, Backstop Premium |  |  | 50,000,000.0 |  |  |
Backstop Commitment Agreement, Commitment Fee |  |  | $ 20,000,000.0 |  |  |
Senior Notes [Member] | 6.875% Senior notes due 2020 |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding |  |  | 6.875% |  |  |
Senior Notes [Member] | Seven Point Eight Seven Five Percent Senior Notes Due Twenty Forty [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding |  |  | 7.875% |  |  |
Senior Notes [Member] | Seven Point Two Zero Percent Debentures Due Twenty Twenty Seven [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding |  |  | 7.20% |  |  |
Senior Notes [Member] | Four Point Eight Seven Five Percent Senior Notes Due Twenty Twenty Two [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding |  |  | 4.875% |  |  |
Senior Notes [Member] | Four Point Seven Five Percent Senior Notes Due Twenty Twenty Four [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding |  |  | 4.75% |  |  |
Senior Notes [Member] | Seven Point Three Seven Five Senior Notes Due Twenty Twenty Five [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding |  |  | 7.375% |  |  |
Senior Notes [Member] | Five Point Four Zero Percent Senior Notes Due Twenty Forty Two [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding |  |  | 5.40% |  |  |
Senior Notes [Member] | Five Point Eight Five Percent Senior Notes Due Twenty Forty Four [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding |  |  | 5.85% |  |  |
Senior Notes [Member] | First Lien Secured Notes [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Backstop Commitment Agreement, Amount Arranged |  |  | $ 187,500,000 |  |  |
Senior Notes [Member] | General Rights Offering [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Backstop Commitment Agreement, Amount Arranged |  |  | 312,500,000 |  |  |
Senior Notes [Member] | General Rights Offering [Member] | Subsequent Event |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Backstop Commitment Agreement, Amount Arranged | $ 50,000,000.0 |  |  |  |  |
Revolving Credit Facility [Member] | Option One [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Debtor-in-Possession Financing, Cash Payment |  |  | 45,000,000 |  |  |
Revolving Credit Facility [Member] | Option Two [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Debtor-in-Possession Financing, Cash Payment |  |  | $ 116,200,000 |  |  |

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