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Subsequent Event - Narrative (Details) - Esja Attractions ehf. - Subsequent Event
€ in Millions, $ in Millions
Nov. 03, 2017
USD ($)
Nov. 03, 2017
EUR (€)
Subsequent Event [Line Items]    
Percentage of controlling interest acquired 54.50% 54.50%
Purchase price $ 9.5 € 8.2