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Significant Accounting Policies (Narrative) (Details)
$ in Thousands, CAD in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Oct. 31, 2016
CAD
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2018
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Significant Accounting Policies [Line Items]                
Restricted cash   $ 1,023     $ 1,023 $ 0 $ 0 $ 257
Impairment of long-lived assets             0  
Percentage of net win retained by Alberta Gaming and Liquor Commission         85.00%      
Percentage of net win retained by Century Downs allocated to the Alberta Lottery Fund         40.00%      
Percentage of win retained by Horse Racing Alberta allocated to different horse racing programs         16.25%      
Percentage of casino net win allocated to charities for table games excluding poker and craps         50.00%      
Percentage of casino net win allocated to charities for poker and craps         25.00%      
Forfeitures of share-based payments recognized           100    
Advertising costs         $ 2,100 2,000 1,700  
Income tax (benefit) CAD 2.2   $ 5,700   4,560 1,787 1,654  
Promotional allowances         1,164 1,096 $ 1,063  
Outstanding balance of promotional balance liability   700     $ 700 $ 700    
Effective tax rate         35.00% 34.00% 34.00%  
Tax Act [Member]                
Significant Accounting Policies [Line Items]                
Income tax (benefit)   5,400     $ (300)      
Effective tax rate       21.00%        
Licensed Charities [Member]                
Significant Accounting Policies [Line Items]                
Percentage of net win retained by Alberta Gaming and Liquor Commission         15.00%      
Alberta Lottery Fund [Member]                
Significant Accounting Policies [Line Items]                
Percentage of net win retained by Alberta Gaming and Liquor Commission         70.00%      
Casinos Poland's LIM Center [Member]                
Significant Accounting Policies [Line Items]                
Impairment of Leasehold         $ 100      
Casinos Poland's Katowice Casino [Member]                
Significant Accounting Policies [Line Items]                
Impairment of Leasehold           $ 400    
Century Casino St. Albert [Member]                
Significant Accounting Policies [Line Items]                
Percentage of casino net win allocated to charities for table games excluding poker and craps         35.00%      
Leashold Improvements [Member] | Saw Close Casino Ltd. [Member]                
Significant Accounting Policies [Line Items]                
Restricted cash   1,000     $ 1,000      
Included In Deposits And Other [Member]                
Significant Accounting Policies [Line Items]                
Restricted cash   744     744 $ 183 $ 202 $ 319
Included In Deposits And Other [Member] | Saw Close Casino Ltd. [Member]                
Significant Accounting Policies [Line Items]                
Restricted cash   600     600      
Deposits Related To Payments Of Prizes and Giveaways [Member] | Casinos Poland Ltd [Member]                
Significant Accounting Policies [Line Items]                
Restricted cash   $ 100     $ 100