Income Taxes - Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
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	$ 31,628	$ (1,539)	$ 93,724
State income tax provision, net of federal income tax benefit	6,247	173	15,645
Non-deductible expenses	1,007	2,539	3,934
Valuation allowance changes affecting the provision for income taxes		(892)	(517)
Excess tax benefits from share based compensation	(92)	(1,434)	(3,525)
Other, net	(90)	2,341	(3,055)
Provision for income taxes	38,700	1,188	106,206
Deferred tax assets:
Accrued benefits	21,401	19,668
Net operating loss carryforward	175,659	229,815
Aircraft credits	22,265	10,767
Deferred revenue	25,405	27,076
Operating lease liabilities	57,991	70,541
Accrued reserves and other	31,431	34,816
Total deferred tax assets	334,152	392,683
Deferred tax liabilities:
Accelerated depreciation	(940,867)	(950,071)
Operating lease right-of-use assets	(56,521)	(68,543)
Total deferred tax liabilities	(997,388)	(1,018,614)
Net deferred tax liability	$ (663,236)	(625,931)
Accounting Standards Update 2016-09
Reconciliation
Benefit from share-based compensation		100	1,400	$ 3,500
ExpressJet [Member] | State and Local Jurisdiction [Member]
Reconciliation
Valuation allowance		$ 900	$ 500