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Debt (Narrative) (Details)
$ in Thousands
1 Months Ended 11 Months Ended 12 Months Ended
Feb. 02, 2021
USD ($)
Feb. 02, 2021
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 09, 2022
USD ($)
Mar. 31, 2021
USD ($)
Dec. 08, 2020
USD ($)
Sep. 29, 2020
USD ($)
Debt Instrument [Line Items]                    
Credit facility, borrowing base     $ 20,000 $ 20,000            
Line of Credit Facility, Commitment Fee Percentage       15.00%            
Stated interest rate on unsecured senior notes     7.125% 7.125%            
Fixed charge coverage ratio     1.0 1.0            
Wholly-owned subsidiaries             $ 75,000      
Commitment fee         12.0          
Reorganization items, net   $ 335,560 $ 0 $ 335,600 $ (19,520) $ 0        
Letter of Credit [Member]                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity                   $ 200,000
Letters of Credit Outstanding, Amount     35,800 35,800            
Unsecured Senior Notes Due 2024 [Member]                    
Debt Instrument [Line Items]                    
Letters of Credit Outstanding, Amount     $ 500,000 $ 500,000            
Stated interest rate on unsecured senior notes     7.75% 7.75%            
DIP Credit Facility [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Face Amount                 $ 120,000  
7.125% Senior Notes [Member]                    
Debt Instrument [Line Items]                    
Stated interest rate on unsecured senior notes     7.125% 7.125%            
7.125% Senior Notes [Member] | Letter of Credit [Member]                    
Debt Instrument [Line Items]                    
Letters of Credit Outstanding, Amount     $ 800,000 $ 800,000            
7.125% Senior Notes [Member] | Line of Credit [Member]                    
Debt Instrument [Line Items]                    
Stated interest rate on unsecured senior notes     7.125% 7.125%            
7.125% Senior Notes [Member] | Prepetition Credit Facility [Member]                    
Debt Instrument [Line Items]                    
Stated interest rate on unsecured senior notes     7.125% 7.125%            
7.750% Senior Notes [Member]                    
Debt Instrument [Line Items]                    
Stated interest rate on unsecured senior notes     7.75% 7.75%            
Fronting fee, percent     100.00% 100.00%            
7.750% Senior Notes [Member] | Line of Credit [Member]                    
Debt Instrument [Line Items]                    
Stated interest rate on unsecured senior notes     7.75% 7.75%            
Jpmorgan Chase Bank Asset Backed Secured Revolving Facility [Member] | Revolving Credit Facility [Member]                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity     $ 114,900 $ 114,900       $ 120,000    
Letters of Credit Outstanding, Amount     37,100 $ 37,100            
Jpmorgan Chase Bank Asset Backed Secured Revolving Facility [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]                    
Debt Instrument [Line Items]                    
Basis spread       3.00%            
Jpmorgan Chase Bank Asset Backed Secured Revolving Facility [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]                    
Debt Instrument [Line Items]                    
Basis spread       3.50%            
Jpmorgan Chase Bank Asset Backed Secured Revolving Facility [Member] | Revolving Credit Facility [Member] | Base Rate [Member] | Minimum [Member]                    
Debt Instrument [Line Items]                    
Basis spread       2.00%            
Jpmorgan Chase Bank Asset Backed Secured Revolving Facility [Member] | Revolving Credit Facility [Member] | Base Rate [Member] | Maximum [Member]                    
Debt Instrument [Line Items]                    
Basis spread       2.50%            
Jpmorgan Chase Bank Asset Backed Secured Revolving Facility [Member] | Scenario, Plan [Member] | Revolving Credit Facility [Member]                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity     $ 170,000 $ 170,000            
Delayed-Draw Term Loan Commitment Letter [Member] | Letter of Credit [Member]                    
Debt Instrument [Line Items]                    
Reorganization items, net $ 12,000