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Acquisitions and Other Recent Business Ventures - Plainridge Racecourse Acquisition (Details)
$ in Thousands
 1 Months Ended 12 Months Ended
Aug. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
ft²
floor
item
mi
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Acquisitions        
Payments of contingent purchase price   $ 1,807    
Plainridge Racecourse        
Acquisitions        
Period over which contingent consideration payments are due   10 years    
Period contingent purchase price consideration is due following first four fiscal quarters   60 days    
Period for yearly contingent purchase price consideration payment after the first payment   9 years    
Fair value of contingent purchase price consideration   $ 10,700 $ 13,800 $ 19,200
Payments of contingent purchase price $ 1,800      
Number of stories at facility | floor   2    
Plainridge Park Casino        
Acquisitions        
Location of facility in distance from major metropolitan area (in miles) | mi   20    
Size of gaming floor at and entertainment facility (in square feet) | ft²   196,473    
Number of gaming devices | item   1,250    
Number of parking spaces | item   1,620    
Length of live harness racing facility (in miles) | mi   0.625    
Size of clubhouse building at raceway (in square feet) | ft²   55,000    
General and administrative expenses | Plainridge Racecourse        
Acquisitions        
Change in long-term debt fair value, included in interest expenses   $ 1,300 $ 5,400 $ (700)