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Summary of Significant Accounting Policies (Property, Plant and Equipment Useful Lives) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]      
Interest Costs Capitalized $ 0.5 $ 0.1 $ 1.4
Building and Improvements | Minimum      
Property, Plant and Equipment [Line Items]      
Property and equipment, estimated useful lives 3 years    
Building and Improvements | Maximum      
Property, Plant and Equipment [Line Items]      
Property and equipment, estimated useful lives 40 years    
Riverboats and Barges | Minimum      
Property, Plant and Equipment [Line Items]      
Property and equipment, estimated useful lives 5 years    
Riverboats and Barges | Maximum      
Property, Plant and Equipment [Line Items]      
Property and equipment, estimated useful lives 40 years    
Furniture and Equipment | Minimum      
Property, Plant and Equipment [Line Items]      
Property and equipment, estimated useful lives 1 year    
Furniture and Equipment | Maximum      
Property, Plant and Equipment [Line Items]      
Property and equipment, estimated useful lives 10 years