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Acquisitions (Kuusamo Warrants and Sportech MSA Termination) (Details) - USD ($)
12 Months Ended
Sep. 21, 2016
Apr. 25, 2016
Jun. 30, 2016
Dec. 31, 2016
Sep. 29, 2015
Sep. 08, 2015
DraftDay Gaming Group            
Business Acquisition [Line Items]            
Number of shares issued in acquisition (in shares)   10,394        
Reduction of principal amount   $ 71,000,000        
Promissory Note            
Business Acquisition [Line Items]            
Stated interest rate (as a percent)         5.00% 5.00%
Kuusamo Promissory Notes Due September 29, 2015 | Unsecured Debt            
Business Acquisition [Line Items]            
Debt issue amount           $ 16,000
Kuusamo Promissory Notes Due March 8, 2016 | Unsecured Debt            
Business Acquisition [Line Items]            
Debt issue amount           $ 125,000
Long-term debt     $ 54,000 $ 0    
Interest expense     $ 5,000,000      
Common Stock | Kuusamo Promissory Notes Due March 8, 2016            
Business Acquisition [Line Items]            
Shares issued in conversion (in shares) 8,410