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Acquisition of Business - Narrative (Details) - Esja Attractions ehf.
€ in Millions
3 Months Ended
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