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Long-Term Debt - Components of Long-Term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Secured Long-term Debt, Noncurrent	$ 2,285,998	$ 2,096,978
Less current maturities	265,979	152,900
Long-term debt and capital leases, net of current maturities and related costs	2,020,019	1,944,078
Finance Lease, Liability	461,364	494,328
Debt and Lease Obligation	(22,393)	(23,465)
Debt Issuance Costs, Net	$ 2,285,998	2,096,978
Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	4.44%
Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	7.01%
Weighted average fixed-interest rate on debt
Debt Instrument [Line Items]
Notes Payable	$ 1,971,579	$ 1,720,998
Long-term Debt, Weighted Average Interest Rate, at Point in Time	6.60%	6.50%
Weighted average variable-interest rate on debt
Debt Instrument [Line Items]
Notes Payable	$ 314,419	$ 375,980
Long-term Debt, Weighted Average Interest Rate, at Point in Time	7.70%	6.10%
Construction Loan Agreement Due 2032
Debt Instrument [Line Items]
Long-term debt and capital leases, net of current maturities and related costs	$ 350,000	$ 350,000
Debt instrument, interest rate, stated percentage	5.75%
Revolving Credit Facilities Due 2027 | Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt and capital leases, net of current maturities and related costs	$ 195,098	30,327
Debt instrument, interest rate, stated percentage	7.93%
Senior Secured Notes Due 2027 | Senior Notes
Debt Instrument [Line Items]
Long-term debt and capital leases, net of current maturities and related costs	$ 700,000	700,000
Senior Secured Notes Due 2027 | Senior Notes | Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	7.25%
Senior Secured Notes Due 2027 | Senior Notes | Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	8.50%
Consolidated Variable Interest Entities Due 2029
Debt Instrument [Line Items]
Long-term debt and capital leases, net of current maturities and related costs	$ 98,198	79,453
Consolidated Variable Interest Entities Due 2029 | Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	2.92%
Consolidated Variable Interest Entities Due 2029 | Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	4.09%
Secured Debt By Aircraft, Engines, Other Equipment And Real Estate | Secured Debt
Debt Instrument [Line Items]
Long-term debt and capital leases, net of current maturities and related costs	$ 503,731	466,335
Secured Debt By Aircraft, Engines, Other Equipment And Real Estate | Secured Debt | Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	1.87%
Secured Debt By Aircraft, Engines, Other Equipment And Real Estate | Secured Debt | Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	8.11%
Long-term Debt [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Long-term debt and capital leases, net of current maturities and related costs	$ 2,308,391	$ 2,120,443

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Amount of short-term and long-term debt and lease obligation.

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