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Redeemable Noncontrolling Interest - Narrative (Details) - Esja Attractions ehf. - EUR (€) | 9 Months Ended |
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Sep. 30, 2018 | Nov. 03, 2017
Redeemable Noncontrolling Interest [Line Items] |  |
Percentage of controlling interest acquired |  | 54.50%
EBITDA trailing period | 12 months |
Put option right of exercisable period upon earnings | 36 months |
Redeemable noncontrolling interest conditions | The put option is only exercisable after 36 months of business operation (the “Reference Date”) and if the FlyOver Iceland attraction has earned a minimum of €3.25 million in unadjusted EBITDA during the most recent fiscal year and during the trailing 12-month period prior to exercise (the “Put Option Condition”). The put option is exercisable during a period of 12 months following the Reference Date (the “Option Period”) and if the Put Option Condition has been met. If the Put Option Condition has not been met during the first Option Period, the Reference Date will be extended for an additional 12 months up to three times. If after 72 months, the FlyOver Iceland attraction has not achieved the Put Option Condition, the put option expires. If the Put Option Condition is met during any of the Option Periods, yet the shares are not exercised prior to the end of the 12-month Option Period, the put option will expire. |
Put option exercisable period | 12 months |
Put option additional exercisable period upon not meeting of conditions | 12 months |
FlyOver Iceland |  |
Redeemable Noncontrolling Interest [Line Items] |  |
Put option expiration period | 72 months |
FlyOver Iceland | Minimum |  |
Redeemable Noncontrolling Interest [Line Items] |  |
Unadjusted EBITDA | € 3,250,000 |

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