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Debt (Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended 2 Months Ended 8 Months Ended 9 Months Ended
Feb. 02, 2021
Mar. 31, 2021
Sep. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Feb. 01, 2021
Dec. 31, 2020
Dec. 09, 2020
Debt Instrument [Line Items]                
Reorganization items, net $ 335,560     $ 0 $ 0      
Extinguishment of Debt, Amount $ 35,800   $ 35,800          
Original Senior Unsecured Notes Due 2021 [Member]                
Debt Instrument [Line Items]                
Stated interest rate     7.125% 7.125%        
New Senior Unsecured Notes Due 2021 [Member]                
Debt Instrument [Line Items]                
Stated interest rate 7.125%   7.125% 7.125%     7.125%  
Letters of Credit Outstanding, Amount             $ 800,000  
Senior Unsecured Notes Due 2024 [Member]                
Debt Instrument [Line Items]                
Stated interest rate 7.75%   7.75% 7.75%     7.75%  
Letters of Credit Outstanding, Amount             $ 500,000  
JPMorgan Chase Bank Asset Backed Secured Revolving Facility [Member] | Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Maximum borrowing capacity   $ 120,000 $ 120,000 $ 120,000        
Line of Credit Facility, Commitment Fee Percentage   0.50%            
Line of Credit Facility, Fixed Charge Coverage Ratio, Amount   $ 20,000            
Letters of Credit Outstanding, Amount     $ 41,100 $ 41,100        
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            
Delayed-Draw Term Loan Commitment Letter [Member] | Letter of Credit [Member]                
Debt Instrument [Line Items]                
Maximum borrowing capacity $ 200,000              
Line of Credit Facility, Commitment Fee Amount 12,000              
Reorganization items, net $ 12,000              
Debtor-In-Possession Financing Facility [Member] | Credit Facility [Member]                
Debt Instrument [Line Items]                
Maximum borrowing capacity           $ 46,600   $ 120,000
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            
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%