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Description Of Business And Basis Of Presentation (Narrative) (Details)
CAD in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Mar. 20, 2015
CAD
Mar. 20, 2015
USD ($)
Jul. 31, 2016
item
Jun. 30, 2015
USD ($)
Sep. 30, 2017
item
Jun. 30, 2016
item
Dec. 31, 2016
USD ($)
item
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Oct. 31, 2014
Description Of Business And Basis Of Presentation [Line Items]                    
Number of ship-based casinos | item             13      
Trip period             4 days      
Adjusted EBITDA             $ 25,762,000 $ 22,798,000 $ 12,850,000  
Correction of Prior Year Balances [Member]                    
Description Of Business And Basis Of Presentation [Line Items]                    
Corrections to adjusted EBITDA               700,000    
Adjusted EBITDA               22,800,000    
Correction of Prior Year Balances [Member] | As Previously Reported [Member]                    
Description Of Business And Basis Of Presentation [Line Items]                    
Adjusted EBITDA               $ 23,500,000    
Lot Polish Airlines Invesment [Member]                    
Description Of Business And Basis Of Presentation [Line Items]                    
Owned by noncontrolling interest             33.30%      
Century Bets! Inc. [Member]                    
Description Of Business And Basis Of Presentation [Line Items]                    
Ownership percentage             75.00%      
Owned by noncontrolling interest             25.00%      
Casinos Poland Ltd [Member] | Lot Polish Airlines Invesment [Member]                    
Description Of Business And Basis Of Presentation [Line Items]                    
Ownership percentage             66.60%      
Oceania Cruises [Member]                    
Description Of Business And Basis Of Presentation [Line Items]                    
Number of ships for which concession agreements will be terminated | item             8      
Term of consulting agreement             2 years      
Assets held for sale       $ 600,000            
Consideration to be received in relation to early termination of concession agreements       $ 4,000,000            
Consulting Fee             $ 2,000,000      
Consulting Fee payable per quarter             $ 250,000      
TUI Cruises, TUI Discovery [Member]                    
Description Of Business And Basis Of Presentation [Line Items]                    
Number of passengers | item           2,067        
TUI Cruises, Mein Schiff 5 [Member]                    
Description Of Business And Basis Of Presentation [Line Items]                    
Number of passengers | item             2,500      
TUI Cruises, Mein Schiff 6 [Member] | Scenario, Forecast [Member]                    
Description Of Business And Basis Of Presentation [Line Items]                    
Number of passengers | item         2,500          
Diamond Cruise International Co. Ltd. [Member]                    
Description Of Business And Basis Of Presentation [Line Items]                    
Number of passengers | item     1,200              
Century Downs Racetrack And Casino [Member]                    
Description Of Business And Basis Of Presentation [Line Items]                    
Ownership percentage             75.00%      
Owned by noncontrolling interest             25.00%      
Century Downs Racetrack And Casino [Member] | Century Casinos Europe GmbH [Member]                    
Description Of Business And Basis Of Presentation [Line Items]                    
Additional ownership acquired 60.00% 60.00%                
Amount of credit agreement converted | CAD CAD 11.0                  
Gain on conversion of debt receivable to equity recognized in accumulated other comprehensive income   $ 100,000                
Gain on conversion of debt receivable to equity   $ 600,000                
Century Downs Racetrack And Casino [Member] | BMO Credit Agreement [Member]                    
Description Of Business And Basis Of Presentation [Line Items]                    
Ownership interest             75.00%      
Mendoza Central Entretenimientos S. A. [Member]                    
Description Of Business And Basis Of Presentation [Line Items]                    
Ownership interest             7.50%      
Mendoza Central Entretenimientos S. A. [Member] | Century Casinos Europe GmbH [Member]                    
Description Of Business And Basis Of Presentation [Line Items]                    
Ownership interest                   7.50%