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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
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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% |  |

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