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Investment in and Advances to Unconsolidated Affiliates (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Jan. 03, 2017
Dec. 31, 2016
Aug. 31, 2016
Investments in and Advances to Affiliates [Line Items]              
Distributed earnings from equity investments     $ 8.7 $ 8.2      
Old Bay Gaming and Racing LLC [Member]              
Investments in and Advances to Affiliates [Line Items]              
Equity Method Investment, Ownership Percentage             50.00%
Ocean Downs [Member]              
Investments in and Advances to Affiliates [Line Items]              
Equity Method Investment, Ownership Percentage         25.00%    
Equity Method Investments         $ 24.0    
Miami Valley Gaming LLC [Member]              
Investments in and Advances to Affiliates [Line Items]              
Equity Method Investment, Ownership Percentage           50.00%  
Distributed earnings from equity investments $ 4.0 $ 4.0          
Ocean Downs LLC and Racing Services LLC [Member]              
Investments in and Advances to Affiliates [Line Items]              
Equity Method Investment, Ownership Percentage Through Other Investments         12.50%    
Equity Method Investment, Effective Ownership Percentage         62.50%