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Summary of Significant Accounting Policies Basis - Narrative (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Aug. 31, 2021
point
Dec. 31, 2024
USD ($)
Dec. 31, 2024
USD ($)
shares
Dec. 31, 2023
USD ($)
shares
Dec. 31, 2022
USD ($)
shares
Property, Plant and Equipment [Line Items]          
Inventory Valuation Reserves   $ 12,600 $ 12,600 $ 10,300  
Proceeds from Sale and Collection of Notes Receivable     50,000    
Accounts Receivable, before Allowance for Credit Loss, Noncurrent   15,100 15,100 17,000  
Capitalized Computer Software, Net   149,700 149,700 139,100  
Capitalized Computer Software, Amortization     18,800 12,400 $ 15,200
Advertising Expense     $ 32,000 $ 41,000 $ 40,100
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares     452,560 81,748 79,644
Preopening Expense       $ 26,500  
Sunseeker Resort          
Property, Plant and Equipment [Line Items]          
Sunseeker impairment   $ 321,837 $ 321,800 0 $ 0
Allegiant Travel Company          
Property, Plant and Equipment [Line Items]          
Equity Method Investment, Ownership Percentage   50.00% 50.00%    
Allways Rewards Loyalty Program          
Property, Plant and Equipment [Line Items]          
Number Of Points Earned For Every Dollar Spent | point 1        
Number Of Points Earned For Every Dollar Spent Over Five Hundred Dollars | point 2        
A320 Series Engine          
Property, Plant and Equipment [Line Items]          
Deferred Costs for Heavy Maintenance     $ 76,800 68,500  
Amortization of Other Deferred Charges     $ 65,800 $ 55,500 $ 43,800
Minimum | Computer hardware and software          
Property, Plant and Equipment [Line Items]          
Property, Plant and Equipment, Useful Life   3 years 3 years    
Maximum | Computer hardware and software          
Property, Plant and Equipment [Line Items]          
Property, Plant and Equipment, Useful Life   15 years 15 years