Debt and Finance Lease Obligations - Narrative (Details) $ in Thousands, € in Millions					3 Months Ended		9 Months Ended
		Aug. 05, 2020 USD ($)	May 14, 2020	Oct. 24, 2018 USD ($)	Sep. 30, 2020 USD ($)	Mar. 31, 2020	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Mar. 17, 2020 USD ($)	Dec. 31, 2019 USD ($)	Feb. 15, 2019 USD ($)	Feb. 15, 2019 EUR (€)
Line of Credit Facility [Line Items]
Minimum liquidity requirement		$ 125,000
Pledge percentage of capital stock		100.00%
Fees related to the amendment		$ 1,700
Unsecured Debt
Line of Credit Facility [Line Items]
Expansion feature - amount available as incremental revolver		$ 250,000
Scenario Forecast
Line of Credit Facility [Line Items]
Minimum liquidity requirement								$ 100,000
LIBOR
Line of Credit Facility [Line Items]
Variable rate		3.50%
FlyOver Iceland Credit Facility
Line of Credit Facility [Line Items]
Maturity date			Sep. 01, 2022			Mar. 01, 2022
Revolving credit facility, balance outstanding	[1]				$ 5,584		$ 5,584			$ 5,607
Maximum borrowing capacity on credit facility											$ 5,600	€ 5.0
Line of credit facility amendment description							an addendum to the FlyOver Iceland Credit Facility effective May 14, 2020 wherein the principal and interest payments were deferred for six months beginning June 1, 2020, with the first payment due December 1, 2020. The addendum also extended the maturity date to September 1, 2022. 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, 2020
2018 Credit Agreement | Revolving Credit Facility
Line of Credit Facility [Line Items]
Borrowing capacity on line of credit				$ 450,000
Maturity date				Oct. 24, 2023
Interest coverage ratio		200.00%
Repayments of Lines of Credit					217,000
Commitment fee percentage on line of credit							0.50%
Remaining borrowing capacity on line of credit									$ 209,800
Revolving credit facility, balance outstanding	[1]				230,543		$ 230,543			$ 311,464
Letters of Credit Outstanding					$ 9,700		$ 9,700
2018 Credit Agreement | Revolving Credit Facility | Maximum
Line of Credit Facility [Line Items]
Leverage ratio during covenant waiver period		400.00%
Leverage ratio, post covenant waiver period		450.00%
Financial covenants leverage ratio step up		400.00%

[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.