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Acquisitions - Tangible Assets (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Minimum [Member] | Gaming equipment [Member]    
Business Acquisition [Line Items]    
Estimated useful life (in years) 2 years  
Maximum [Member] | Gaming equipment [Member]    
Business Acquisition [Line Items]    
Estimated useful life (in years) 6 years  
Cadillac Jack [Member]    
Business Acquisition [Line Items]    
Gaming equipment   $ 0