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Debt (Narrative) (Details) - USD ($)
1 Months Ended 2 Months Ended 5 Months Ended
Feb. 02, 2021
Mar. 31, 2021
Jun. 30, 2021
Feb. 01, 2021
Dec. 31, 2020
Dec. 09, 2020
Debt Instrument [Line Items]            
Reorganization items, net $ 335,560,000   $ 0      
Extinguishment of Debt, Amount $ 35,800,000   $ 35,800,000      
Original Senior Unsecured Notes Due 2021 [Member]            
Debt Instrument [Line Items]            
Stated interest rate     7.125%      
New Senior Unsecured Notes Due 2021 [Member]            
Debt Instrument [Line Items]            
Stated interest rate 7.125%   7.125%   7.125%  
Letters of Credit Outstanding, Amount         $ 800,000,000.0  
Senior Unsecured Notes Due 2024 [Member]            
Debt Instrument [Line Items]            
Stated interest rate 7.75%   7.75%   7.75%  
Letters of Credit Outstanding, Amount         $ 500,000,000.0  
JPMorgan Chase Bank Asset Backed Secured Revolving Facility [Member] | Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Maximum borrowing capacity   $ 120,000,000.0        
Line of Credit Facility, Commitment Fee Percentage   0.50%        
Line of Credit Facility, Fixed Charge Coverage Ratio, Amount   $ 20,000,000.0        
Letters of Credit Outstanding, Amount   45,000,000.0        
JPMorgan Chase Bank Asset Backed Secured Revolving Facility [Member] | Revolving Credit Facility [Member] | Scenario, Plan [Member]            
Debt Instrument [Line Items]            
Maximum borrowing capacity   $ 170,000,000.0        
Delayed-Draw Term Loan Commitment Letter [Member] | Letter of Credit [Member]            
Debt Instrument [Line Items]            
Maximum borrowing capacity $ 200,000,000.0          
Line of Credit Facility, Commitment Fee Amount 12,000,000.0          
Reorganization items, net $ 12,000,000.0          
Debtor-In-Possession Financing Facility [Member] | Credit Facility [Member]            
Debt Instrument [Line Items]            
Maximum borrowing capacity       $ 46,600,000   $ 120,000,000.0
Minimum [Member] | JPMorgan Chase Bank Asset Backed Secured Revolving Facility [Member] | Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Stated interest rate   3.00%        
Line of Credit Facility, Coverage Ratio   0.25%        
Line of Credit Facility, Fixed Charge Coverage Ratio   1.00%        
Line of Credit Facility, Fixed Charge Coverage Ratio, Aggregate Commitments   15.00%        
Minimum [Member] | JPMorgan Chase Bank Asset Backed Secured Revolving Facility [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument [Line Items]            
Variable interest rate   3.00%        
Minimum [Member] | JPMorgan Chase Bank Asset Backed Secured Revolving Facility [Member] | Revolving Credit Facility [Member] | Base Rate [Member]            
Debt Instrument [Line Items]            
Variable interest rate   2.00%        
Maximum [Member] | JPMorgan Chase Bank Asset Backed Secured Revolving Facility [Member] | Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Cash collateralized   $ 75,000,000.0        
Stated interest rate   3.50%        
Line of Credit Facility, Fixed Charge Coverage Ratio   1.00%        
Maximum [Member] | JPMorgan Chase Bank Asset Backed Secured Revolving Facility [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument [Line Items]            
Variable interest rate   3.50%        
Maximum [Member] | JPMorgan Chase Bank Asset Backed Secured Revolving Facility [Member] | Revolving Credit Facility [Member] | Base Rate [Member]            
Debt Instrument [Line Items]            
Variable interest rate   2.50%