Income Taxes - Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Taxes
Statutory Federal income tax rate (as a percent)	21.00%	21.00%	21.00%
Reconciliation
Computed provision (benefit) for income taxes at the statutory rate	$ 8,465	$ 19,442	$ 31,628
State income tax provision, net of federal income tax benefit	2,056	4,295	6,247
Non-deductible expenses	3,578	546	1,007
Valuation allowance changes affecting the provision for income taxes	(1,085)	1,716
Excess tax benefits from share based compensation	939	534	(92)
Change in unrecognized tax benefit	(7,556)	(7,319)
Other, net	(430)	416	(90)
Provision for income taxes	5,967	19,630	38,700
Valuation allowance	1,100	1,700
Benefit (expense) from share-based compensation	(900)	(500)	$ 100
Deferred tax assets:
Accrued benefits	28,889	29,154
Net operating loss carryforward	130,478	186,517
Aircraft credits	93,189	77,962
Deferred revenue	91,809	35,385
Operating lease liabilities	21,207	39,209
Interest deduction limitation	11,563	26,469
Accrued reserves and other	64,971	49,972
Total deferred tax assets	442,106	444,668
Valuation allowance	(630)	(1,716)
Deferred tax liabilities:
Accelerated depreciation	(1,108,042)	(1,094,538)
Operating lease right-of-use assets	(21,034)	(35,474)
Total deferred tax liabilities	(1,129,076)	(1,130,012)
Net deferred tax liability	$ (687,600)	$ (687,060)