Debt Instrument, Market-to-Market Adjustments For Convertible Notes

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Amount recognized for the passage of time, typically for liabilities, that have been discounted to their net present values. Excludes accretion associated with asset retirement obligations.

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Amount of amortization expense attributable to debt discount (premium) and debt issuance costs.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of the cost of borrowed funds accounted for as interest expense.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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Aggregate amount of interest paid or due on all long-term debt.

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Amount of the fee for available but unused credit capacity under the credit facility.

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Debt and Other Obligations - Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Aug. 31, 2020
Debt Instrument [Line Items]
Commitment and other fees	$ 535	$ 428
Amortization of deferred financing costs	4,222	3,509
Total	37,880	44,806
Accretion expense	261	434
Amortization of debt discount	2,538	0
8.00% senior secured notes due 2025
Debt Instrument [Line Items]
Accretion expense	300	400
Interest expense	$ 10,200	17,000
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%
Interest expense	$ 10,461	17,434
Fixed-rate term loans
Debt Instrument [Line Items]
Interest expense	10,684	10,903
Unsecured term loans \| Payroll Support Program, CARES Act
Debt Instrument [Line Items]
Interest expense	336	199
Class A 2015-1 EETC
Debt Instrument [Line Items]
Interest expense	3,048	3,275
Class B 2015-1 EETC
Debt Instrument [Line Items]
Interest expense	616	705
Class C 2015-1 EETC
Debt Instrument [Line Items]
Interest expense	917	1,056
Class AA 2017-1 EETC
Debt Instrument [Line Items]
Interest expense	1,638	1,755
Class A 2017-1 EETC
Debt Instrument [Line Items]
Interest expense	590	633
Class B 2017-1 EETC
Debt Instrument [Line Items]
Interest expense	512	557
Class C 2017-1 EETC
Debt Instrument [Line Items]
Interest expense	1,080	1,080
Convertible notes
Debt Instrument [Line Items]
Interest expense	3,223	2,078
Convertible notes \| Convertible Debt Due In 2025 And 2026
Debt Instrument [Line Items]
Interest expense	1,600
Convertible notes \| Convertible notes due 2026
Debt Instrument [Line Items]
Amortization of debt discount	2,500
Offset of market-to-market adjustment	900
Convertible notes \| Convertible Debt Due in 2025
Debt Instrument [Line Items]
Interest expense		2,100
Revolving credit facilities
Debt Instrument [Line Items]
Interest expense	0	1,170
Finance leases
Debt Instrument [Line Items]
Interest expense	$ 18	$ 24