Debt and Finance Lease Obligations - Narrative (Details) € in Millions, kr in Millions					12 Months Ended
		Jan. 08, 2021	Aug. 05, 2020 USD ($)	Oct. 24, 2018 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 EUR (€)	Dec. 31, 2020 ISK (kr)	Dec. 29, 2020 ISK (kr)	Oct. 15, 2020 ISK (kr)	Dec. 31, 2019 USD ($)	Feb. 15, 2019 USD ($)	Feb. 15, 2019 EUR (€)
Line Of Credit Facility [Line Items]
Minimum liquidity requirement					$ 100,000,000
Pledge percentage of capital stock			100.00%
Fees related to the amendment			$ 1,700,000
Liabilities Current					$ 97,733,000					$ 237,323,000
LIBOR rate [Member]
Line Of Credit Facility [Line Items]
Variable rate			3.50%
Revolving Credit Facility | Maximum
Line Of Credit Facility [Line Items]
Leverage ratio during covenant waiver period			400.00%
FlyOver Iceland Credit Facility
Line Of Credit Facility [Line Items]
Maturity date		Sep. 01, 2023			Mar. 01, 2022
Revolving credit facility, balance outstanding	[1]				$ 5,820,000					5,607,000
Maximum borrowing capacity on credit facility											$ 5,600,000	€ 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 Payment1		Dec. 01, 2020
Liabilities Current					$ 5,800,000	€ 4.8
Fly Over Iceland Term Loan
Line Of Credit Facility [Line Items]
Revolving credit facility, balance outstanding	[1]				705,000
Maximum borrowing capacity on credit facility					700,000		kr 90.0
2018 Credit Agreement | Revolving Credit Facility
Line Of Credit Facility [Line Items]
Borrowing capacity on line of credit				$ 450,000,000
Additional borrowing capacity on line of credit				250,000,000
Line of Credit borrowings used to support letter of credit				$ 20,000,000
Maturity date				Oct. 24, 2023
Annual share repurchase and dividends limit on leverage ratio basis				$ 20,000,000
Leverage ratio required for dividend or share activity				275.00%
Maximum additional dividends amount permitted to distribute				$ 15,000,000
Interest coverage ratio			200.00%
Remaining borrowing capacity on line of credit					173,500,000
Revolving credit facility, balance outstanding	[1]				266,762,000					$ 311,464,000
Letters of Credit Outstanding					$ 9,700,000
Commitment fee percentage on line of credit					0.50%
2018 Credit Agreement | Revolving Credit Facility | Maximum
Line Of Credit Facility [Line Items]
Leverage ratio, post covenant waiver period			450.00%
Financial covenants leverage ratio step up			400.00%
Amendment Three Credit Agreement [Member]
Line Of Credit Facility [Line Items]
Minimum liquidity requirement					$ 100,000,000
Pledge percentage of capital stock			100.00%
Fees related to the amendment			$ 1,700,000
Amendment Three Credit Agreement [Member] | Unsecured Debt [Member]
Line Of Credit Facility [Line Items]
Credit Facility Expansion Feature			$ 250,000,000
Amendment Three Credit Agreement [Member] | LIBOR rate [Member]
Line Of Credit Facility [Line Items]
Variable rate			3.50%
First Term Loan [Member] | Fly Over Iceland Term Loan
Line Of Credit Facility [Line Items]
Maturity date					Apr. 01, 2023
Maximum borrowing capacity on credit facility | 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 [Member] | Fly Over Iceland Term Loan
Line Of Credit Facility [Line Items]
Maturity date					Oct. 01, 2024
Maximum borrowing capacity on credit facility | 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 [Member] | Fly Over Iceland Term Loan
Line Of Credit Facility [Line Items]
Maturity date					Feb. 01, 2023
Maximum borrowing capacity on credit facility | 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.