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Long-Term Debt - Components of Long-Term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Secured Long-term Debt, Noncurrent	$ 1,961,918	$ 2,066,504
Long-term Debt, Current Maturities	183,063	454,769
Long-term debt and capital leases, net of current maturities and related costs	1,778,855	1,611,735
Finance Lease, Liability	416,669	429,896
Debt and Lease Obligation	(12,867)	(17,129)
Debt Issuance Costs, Net	$ 1,961,918	2,066,504
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	7.02%
Weighted average fixed-interest rate on debt
Debt Instrument [Line Items]
Notes Payable	$ 1,336,800	$ 1,481,186
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	$ 625,118	$ 585,318
Long-term Debt, Weighted Average Interest Rate, at Point in Time	6.60%	6.80%
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 | Maximum [Member] | Senior Notes
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	$ 101,593	107,959
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%
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	$ 0	0
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	$ 906,523	765,278
Secured Debt By Aircraft, Engines, Other Equipment And Real Estate | Minimum [Member] | Secured Debt
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	1.87%
Secured Debt By Aircraft, Engines, Other Equipment And Real Estate | Maximum [Member] | Secured Debt
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	8.38%
Construction Loan Agreement Due 2032
Debt Instrument [Line Items]
Long-term debt and capital leases, net of current maturities and related costs	$ 0	100,000
Long-term Debt [Member] | Unsecured debt
Debt Instrument [Line Items]
Long-term debt and capital leases, net of current maturities and related costs	1,974,785	2,083,633
Unsecured debt
Debt Instrument [Line Items]
Long-term debt and capital leases, net of current maturities and related costs	$ 0	$ 130,500

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