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Debt and Other Obligations - Interest Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Debt Instrument [Line Items]      
Commitment and other fees $ 417 $ 535  
Amortization of deferred financing costs 3,976 4,222  
Total 51,793 37,880  
Accretion expense 1,052 261  
Amortization of debt discount 3,808 2,538  
8.00% senior secured notes due 2025      
Debt Instrument [Line Items]      
Accretion expense 1,100 300  
Interest expense $ 22,200 $ 10,200  
8.00% senior secured notes due 2025 | 8.00% Senior Secured Notes Due 2025      
Debt Instrument [Line Items]      
Stated interest rate percentage 8.00% 8.00% 8.00%
Interest expense $ 23,252 $ 10,461  
Fixed-rate term loans      
Debt Instrument [Line Items]      
Interest expense 9,563 10,684  
Unsecured term loans | Unsecured term loans      
Debt Instrument [Line Items]      
Interest expense 336 336  
Class A 2015-1 EETC      
Debt Instrument [Line Items]      
Interest expense 2,824 3,048  
Class B 2015-1 EETC      
Debt Instrument [Line Items]      
Interest expense 528 616  
Class C 2015-1 EETC      
Debt Instrument [Line Items]      
Interest expense 777 917  
Class AA 2017-1 EETC      
Debt Instrument [Line Items]      
Interest expense 1,521 1,638  
Class A 2017-1 EETC      
Debt Instrument [Line Items]      
Interest expense 548 590  
Class B 2017-1 EETC      
Debt Instrument [Line Items]      
Interest expense 476 512  
Class C 2017-1 EETC      
Debt Instrument [Line Items]      
Interest expense 522 1,080  
Convertible notes      
Debt Instrument [Line Items]      
Interest expense 7,045 3,223  
Convertible notes | Convertible Debt Due In 2025 And 2026      
Debt Instrument [Line Items]      
Interest expense 1,600 1,600  
Convertible notes | Convertible notes due 2026      
Debt Instrument [Line Items]      
Amortization of debt discount 3,800 2,500  
Offset of market-to-market adjustment 1,700 (900)  
Finance leases      
Debt Instrument [Line Items]      
Interest expense $ 8 $ 18