Long-Term Debt - Components of Long-Term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Debt Instrument [Line Items]
Secured Long-term Debt, Noncurrent	$ 1,791,834	$ 1,799,616
Long-term Debt, Current Maturities	121,346	118,075
Long-term debt and capital leases, net of current maturities and related costs	1,670,488	1,681,541
Finance Lease, Liability	396,184	403,060
Debt and Lease Obligation	(15,519)	(16,648)
Debt Issuance Costs, Net	$ 1,791,834	1,799,616
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	$ 1,068,164	$ 1,062,935
Long-term Debt, Weighted Average Interest Rate, at Point in Time	6.60%	6.70%
Weighted average variable-interest rate on debt
Debt Instrument [Line Items]
Notes Payable	$ 723,670	$ 736,681
Long-term Debt, Weighted Average Interest Rate, at Point in Time	5.70%	5.90%
Senior Secured Notes Due 2027 \| Senior Notes
Debt Instrument [Line Items]
Long-term debt and capital leases, net of current maturities and related costs	$ 403,009	$ 403,009
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	$ 112,315	95,111
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	$ 895,845	915,084
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	7.74%
Total debt and finance lease obligations \| Unsecured debt
Debt Instrument [Line Items]
Long-term debt and capital leases, net of current maturities and related costs	$ 1,807,353	$ 1,816,264

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

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-Subparagraph (SX 210.7-03(a)(16)(a)(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(17))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

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