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Debt and Finance Lease Obligations - Narrative (Details)
$ in Thousands, € in Millions, kr in Millions
6 Months Ended 12 Months Ended
Jul. 30, 2021
USD ($)
Jan. 08, 2021
Oct. 24, 2018
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
ISK (kr)
Dec. 29, 2020
ISK (kr)
Oct. 15, 2020
ISK (kr)
Feb. 15, 2019
USD ($)
Feb. 15, 2019
EUR (€)
FlyOver Iceland Credit Facility                    
Line Of Credit Facility [Line Items]                    
Maturity date   Sep. 01, 2023   Mar. 01, 2022            
Credit facility [1]       $ 5,754 $ 5,820          
Line of credit facility maximum borrowing capacity                 $ 5,600 € 5.0
Line Of Credit Facility Amendment Description       an addendum to the FlyOver Iceland Credit Facility effective January 8, 2021 wherein the principal payments were deferred for twelve months beginning December 1, 2020, with the first payment due December 1, 2021. The addendum also extended the maturity date to September 1, 2023. There were no other changes to the terms of the FlyOver Iceland Credit Facility            
Line Of Credit Facility Date Of First Required Payment   Dec. 01, 2021                
Fly Over Iceland Term Loan                    
Line Of Credit Facility [Line Items]                    
Credit facility [1]       $ 727 705          
Line of credit facility maximum borrowing capacity         700 kr 90.0        
2018 Credit Agreement | Revolving Credit Facility                    
Line Of Credit Facility [Line Items]                    
Borrowing capacity on line of credit     $ 450,000              
Line of Credit borrowings used to support letter of credit     $ 20,000              
Maturity date     Oct. 24, 2023              
Remaining borrowing capacity on line of credit       113,500            
Credit facility [1]       326,949 $ 266,762          
Letters of Credit Outstanding       9,500            
2018 Credit Agreement | Revolving Credit Facility | Subsequent Event                    
Line Of Credit Facility [Line Items]                    
Borrowing capacity on line of credit $ 450,000                  
Maturity date Oct. 24, 2023                  
2018 Credit Agreement | Revolving Credit Facility | Borrowings                    
Line Of Credit Facility [Line Items]                    
Credit facility       327,000            
Amendment Credit Agreement [Member]                    
Line Of Credit Facility [Line Items]                    
Minimum liquidity requirement       $ 100,000            
2021 Credit Facility | Subsequent Event | London Interbank Offered Rate (LIBOR)                    
Line Of Credit Facility [Line Items]                    
Interest rate description 5.00%, with a LIBOR floor of 0.50%.                  
2021 Credit Facility | Revolving Credit Facility | Subsequent Event                    
Line Of Credit Facility [Line Items]                    
Minimum liquidity requirement $ 75,000                  
Line of credit facility maximum borrowing capacity $ 100,000                  
Maturity date July 30, 2026                  
2021 Credit Facility | Revolving Credit Facility | Subsequent Event | London Interbank Offered Rate (LIBOR)                    
Line Of Credit Facility [Line Items]                    
Interest rate description 5.00%, with a LIBOR floor of 0.50%.                  
2021 Credit Facility | Revolving Credit Facility | Maximum | Subsequent Event                    
Line Of Credit Facility [Line Items]                    
Financial covenants leverage ratio step up 400.00%                  
Leverage ratio 450.00%                  
Debt covenant, interest coverage ratio 250.00%                  
2021 Credit Facility | Revolving Credit Facility | Minimum | Subsequent Event                    
Line Of Credit Facility [Line Items]                    
Interest coverage ratio 200.00%                  
2021 Credit Facility | Senior Secured Credit Facility | Subsequent Event                    
Line Of Credit Facility [Line Items]                    
Line of credit facility maximum borrowing capacity $ 500,000                  
2021 Credit Facility | Term Loan B | Subsequent Event                    
Line Of Credit Facility [Line Items]                    
Line of credit facility maximum borrowing capacity $ 400,000                  
Maturity date July 30, 2028                  
First Term Loan | Fly Over Iceland Term Loan                    
Line Of Credit Facility [Line Items]                    
Maturity date         Apr. 01, 2023          
Line of credit facility maximum borrowing capacity | kr               kr 10.0    
Line Of Term Loan Amendment Description         bears interest on a seven-day term deposit at the Central Bank of Iceland          
Second Term Loan | Fly Over Iceland Term Loan                    
Line Of Credit Facility [Line Items]                    
Maturity date         Oct. 01, 2024          
Line of credit facility maximum borrowing capacity | kr               kr 30.0    
Line Of Term Loan Amendment Description         bears interest on a seven-day term deposit at the Central Bank of Iceland plus 3.07%          
Third Term Loan | Fly Over Iceland Term Loan                    
Line Of Credit Facility [Line Items]                    
Maturity date         Feb. 01, 2023          
Line of credit facility maximum borrowing capacity | kr             kr 50.0      
Line Of Term Loan Amendment Description         bears interest at one-month Reykjavik InterBank Offered Rate (“REIBOR”) plus 4.99%. The Icelandic State Treasury guarantees supplemental loans provided by credit institutions to companies impacted by the COVID-19 pandemic. Accordingly, the Icelandic State Treasury guaranteed the repayment of up to 85% of the principal and interest on the ISK 10.0 million and ISK 30.0 million term loans and 70% of the principal amount on the ISK 50.0 million term loan          
[1] Represents the weighted-average interest rate in effect at the respective periods, including any applicable margin. The interest rates do not include amortization of debt issuance costs or commitment fees.