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Fair Value Measurements (Narrative-Balances Measured at Fair Value) (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Dec. 20, 2011
Sep. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investment available for sale   $ 17,300 $ 16,800  
Available-for-sale Securities, Current     400  
Fair Value, Discount Amount, Available for sales securities   3,000 3,100  
Business Combination, Contingent Consideration, Liability for Payments to Option Holder, Current   800 900  
Business Combination, Contingent Consideration, Liability for Payments to Option Holder, Noncurrent   2,200 2,200  
Fair Value, Measurements, Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investment available for sale   $ 17,823 17,259 $ 20,500
Debt Security, Interest Rate, Stated Percentage   7.50%    
Fair Value, Measurements, Recurring [Member] | Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investment available for sale   $ 17,823 $ 17,259  
Available-for-sale Securities [Member] | Discount Rate [Member] | Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques, Unobservable Inputs, Rate, Percentage   9.865% 10.283%  
Peninsula Gaming [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale Securities, Current   $ 500 $ 400  
Kansas Star [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Business Combination, Contingent Consideration Arrangements, Payment to Option Holder, Percentage of EBITDA 1.00%      
Contingent Payments | Discount Rate [Member] | Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques, Unobservable Inputs, Rate, Percentage   9.10% 18.50%