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Acquisition of Business - Narrative (Details)
$ in Thousands, € in Millions
3 Months Ended 9 Months Ended
Nov. 03, 2017
USD ($)
Nov. 03, 2017
EUR (€)
Sep. 30, 2018
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Business Acquisition [Line Items]          
Purchase price allocation adjustment to goodwill       $ (73)  
Esja Attractions ehf.          
Business Acquisition [Line Items]          
Business acquisition date Nov. 03, 2017 Nov. 03, 2017      
Percentage of controlling interest acquired 54.50%        
Purchase price $ 9,500 € 8.2      
Estimated fair value of non-controlling interest $ 6,700        
Purchase price allocation adjustment to goodwill     $ 100    
Esja Attractions ehf. | Start-up Costs          
Business Acquisition [Line Items]          
Operating income (losses)     $ (400) (800)  
Esja Attractions ehf. | Corporate Activities          
Business Acquisition [Line Items]          
Acquisition related costs       $ 100 $ 100