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Goodwill and Other Intangible Assets - Goodwill by Reporting Unit and Segment (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 29, 2016
Goodwill by reporting unit and segment        
Goodwill $ 261,330 $ 270,551 $ 254,022  
GES U.S.        
Goodwill by reporting unit and segment        
Goodwill 148,277 148,277 148,277  
GES International        
Goodwill by reporting unit and segment        
Goodwill 36,621 38,840 34,460  
GES International | GES EMEA        
Goodwill by reporting unit and segment        
Goodwill 29,954 31,612    
GES International | GES Canada        
Goodwill by reporting unit and segment        
Goodwill 6,667 7,228    
GES        
Goodwill by reporting unit and segment        
Goodwill 184,898 187,117    
Pursuit        
Goodwill by reporting unit and segment        
Goodwill 76,432 83,434 $ 71,285  
Pursuit | Banff Jasper Collection        
Goodwill by reporting unit and segment        
Goodwill 32,009 35,305    
Pursuit | Alaska Collection        
Goodwill by reporting unit and segment        
Goodwill 3,184 3,184    
Pursuit | Glacier Park Collection        
Goodwill by reporting unit and segment        
Goodwill 1,268 1,268    
FlyOver Canada        
Goodwill by reporting unit and segment        
Goodwill       $ 34,089
FlyOver Canada | Pursuit        
Goodwill by reporting unit and segment        
Goodwill $ 39,971 $ 43,677