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Long-Term Debt - Components of Long-Term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Secured Long-term Debt, Noncurrent	$ 2,188,132	$ 2,259,654
Less current maturities	420,882	439,937
Long-term debt and capital leases, net of current maturities and related costs	1,767,250	1,819,717
Finance Lease, Liability	436,370	455,248
Debt and Lease Obligation	(17,403)	(22,515)
Debt Issuance Costs, Net	$ 2,188,132	2,259,654
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	$ 1,763,074	$ 1,834,754
Long-term Debt, Weighted Average Interest Rate, at Point in Time	6.40%	6.30%
Weighted average variable-interest rate on debt
Debt Instrument [Line Items]
Notes Payable	$ 425,058	$ 424,900
Long-term Debt, Weighted Average Interest Rate, at Point in Time	7.70%	7.90%
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	$ 124,395	200,000
Debt instrument, interest rate, stated percentage	7.72%
Senior Secured Notes Due 2027 | Senior Notes
Debt Instrument [Line Items]
Long-term debt and capital leases, net of current maturities and related costs	$ 550,000	550,000
Senior Secured Notes Due 2027 | Senior Notes | Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	7.25%
Consolidated Variable Interest Entities Due 2029
Debt Instrument [Line Items]
Long-term debt and capital leases, net of current maturities and related costs	$ 118,881	130,650
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	5.19%
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	$ 625,889	596,271
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	8.91%
Long-term Debt [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Long-term debt and capital leases, net of current maturities and related costs	$ 2,205,535	$ 2,282,169

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