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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