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Acquisition of Business - Narrative (Details) - Esja Attractions ehf. € in Millions |  | 3 Months Ended
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Nov. 03, 2017 USD ($) | Nov. 03, 2017 EUR (€) | Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($)
Business Acquisition [Line Items] |  |  |  |
Business acquisition date | Nov. 03, 2017 | Nov. 03, 2017 |  |
Percentage of controlling interest acquired | 54.50% |  |  |
Purchase price | $ 8,200,000 | € 9.5 |  |
Estimated fair value of non-controlling interest | $ 6,700,000 |  |  |
Fair value of noncontrolling interest, adjustments |  |  | $ 0 |
Start-up Costs |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Operating income (losses) |  |  | (200,000) |
Corporate Activities |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquisition related costs |  |  | $ 100,000 | $ 100,000

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- Definition Date when the business acquisition agreement was executed, in CCYY-MM-DD format. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460 + Details
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- Definition This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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