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Fair Value Measurements (Narrative-Balances Measured at Fair Value) (Details) - USD ($)
$ in Thousands
Dec. 20, 2011
Sep. 30, 2016
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investment available for sale   $ 17,800 $ 17,400  
Fair Value, Discount Amount, Available for sales securities   3,100 3,200  
Business Combination, Contingent Consideration, Liability for Payments to Option Holder, Current   900    
Business Combination, Contingent Consideration, Liability for Payments to Option Holder, Noncurrent   2,500 2,700  
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%      
Peninsula Gaming        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale Securities, Current   400 400  
Fair Value, Discount Amount, Available for sales securities     3,200  
Business Combination, Contingent Consideration, Liability for Payments to Option Holder, Current     900  
Business Combination, Contingent Consideration, Liability for Payments to Option Holder, Noncurrent     2,700  
Fair Value, Measurements, Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investment available for sale   $ 18,279 $ 17,839 $ 21,000
Debt Security, Interest Rate, Stated Percentage   7.50%