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		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Aug. 31, 2020
Debt Instrument [Line Items]
Commitment and other fees	$ 418	$ 604	$ 955	$ 1,032
Amortization of deferred financing costs	3,210	3,274	7,432	6,783
Total	30,124	39,662	68,004	84,468
Accretion expense			521	753
Amortization of debt discount			6,346	0
8.00% senior secured notes due 2025
Debt Instrument [Line Items]
Accretion expense	300	300	500	800
Interest expense	$ 10,200	13,200	$ 20,400	30,200
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	$ 10,461	13,541	$ 20,921	30,975
Fixed-rate term loans
Debt Instrument [Line Items]
Interest expense	10,485	10,746	21,169	21,649
Unsecured term loans \| Payroll Support Program, CARES Act
Debt Instrument [Line Items]
Interest expense	340	282	676	481
Class A 2015-1 EETC
Debt Instrument [Line Items]
Interest expense	2,954	3,178	6,001	6,453
Class B 2015-1 EETC
Debt Instrument [Line Items]
Interest expense	575	664	1,191	1,369
Class C 2015-1 EETC
Debt Instrument [Line Items]
Interest expense	856	997	1,773	2,053
Class AA 2017-1 EETC
Debt Instrument [Line Items]
Interest expense	1,640	1,759	3,278	3,514
Class A 2017-1 EETC
Debt Instrument [Line Items]
Interest expense	591	634	1,182	1,267
Class B 2017-1 EETC
Debt Instrument [Line Items]
Interest expense	510	556	1,022	1,113
Class C 2017-1 EETC
Debt Instrument [Line Items]
Interest expense	1,092	1,092	2,171	2,171
Convertible notes
Debt Instrument [Line Items]
Interest expense	(3,024)	1,749	199
Convertible notes \| Convertible Debt Due In 2025 And 2026
Debt Instrument [Line Items]
Interest expense	1,600		3,200
Convertible notes \| Convertible notes due 2026
Debt Instrument [Line Items]
Interest expense		1,700		3,800
Amortization of debt discount	3,800		6,300
Offset of market-to-market adjustment	8,400		9,300
Convertible notes \| Convertible Debt Due in 2025
Debt Instrument [Line Items]
Interest expense		1,700		3,827
Revolving credit facilities
Debt Instrument [Line Items]
Interest expense	0	562	0	1,733
Finance leases
Debt Instrument [Line Items]
Interest expense	$ 16	$ 24	$ 34	$ 48