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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.

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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- Definition Debt covenant leverage ratio during covenant waiver period. + References No definition available. + Details
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