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Income Taxes - Reconciliation (Details) - USD ($)
$ in Thousands
 12 Months Ended
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 for income taxes at the statutory rate $ (1,539) $ 93,724 $ 76,926
State income tax provision, net of federal income tax benefit 173 15,645 12,711
Non-deductible expenses 2,539 3,934 1,956
Valuation allowance changes affecting the provision for income taxes (892) (517) (1,187)
Foreign income taxes, net of federal & state benefit     1,192
Excess tax benefits from share based compensation (1,434) (3,525) (4,548)
Other, net 2,341 (3,055) (1,108)
Provision for income taxes 1,188 106,206 85,942
Deferred tax assets:      
Accrued benefits 19,668 20,848  
Net operating loss carryforward 229,815 358,685  
AMT credit carryforward   4,397  
Aircraft credits 12,765 9,114  
Deferred revenue 27,076    
Accrued reserves and other 34,816 17,225  
Total deferred tax assets 324,140 410,269  
Valuation allowance   (892)  
Deferred tax liabilities:      
Accelerated depreciation (950,071) (1,032,957)  
Total deferred tax liabilities (950,071) (1,032,957)  
Net deferred tax liability (625,931) (623,580)  
Accounting Standards Update 2016-09      
Reconciliation      
Benefit from share-based compensation 1,400 3,500 4,500
ExpressJet | State      
Reconciliation      
Valuation allowance $ 900 $ 500 $ 1,200