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Summary of Financial Statement Preparation and Significant Accounting Policies (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2022
Jan. 01, 2022
Dec. 31, 2021
Sep. 25, 2017
Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Line Items]        
Additional paid-in capital $ (1,037,139) $ 1,034,727 $ (1,074,286)  
Retained earnings (435,189) 330,301 (309,430)  
Convertible Debt $ (256,377) 255,861 (231,646)  
Deferred Tax Liabilities, Net   (211,764) (217,291)  
Unamortized Debt Issuance Expense   2,889    
Debt Instrument, Unamortized Discount   0    
Property, Plant and Equipment Property and equipment, to be held and used, is summarized as follows (in thousands):
 
 June 30,
2022
December 31,
2021
Flight equipment$3,405,297 $3,301,113 
Ground equipment$68,565 64,641 
Leasehold improvements, facilities and office equipment$39,216 38,769 
Aircraft modifications and projects in progress$308,306 206,917 
$3,821,384 3,611,440 
Accumulated depreciation$(1,550,728)(1,481,506)
Property and equipment, net$2,270,656 $2,129,934 
     
Convertible Debt [Member]        
Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Line Items]        
Convertible Debt $ (258,750) 258,750 (258,750) $ (258,800)
Unamortized Debt Issuance Expense 2,373   2,889  
Debt Instrument, Unamortized Discount $ 0   $ 24,215  
Accounting Standards Update 2020-06        
Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Line Items]        
Additional paid-in capital   (39,559)    
Retained earnings   20,871    
Convertible Debt   24,215    
Deferred Tax Liabilities, Net   5,527    
Unamortized Debt Issuance Expense   0    
Debt Instrument, Unamortized Discount   (24,215)    
Accounting Standards Update 2020-06 | Convertible Debt [Member]        
Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Line Items]        
Convertible Debt   $ 0