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Fair Value Measurements (Narrative-Balances Measured at Fair Value) (Details) - USD ($) $ in Thousands |  | 3 Months Ended |
--- | --- | --- | ---
Dec. 20, 2011 | Mar. 31, 2016 | Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Document Period End Date |  | Mar. 31, 2016 |
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% |  |
Business Combination, Contingent Consideration Arrangements, Payment to Option Holder, Term | 10 years |  |
Peninsula Gaming |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale Securities, Current |  | $ 400 | $ 400
Investment available for sale |  | 18,000 | 17,400
Fair Value, Discount Amount, Available for sales securities |  | 3,200 | 3,200
Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale securities, gross |  | 21,400 |
Investment available for sale |  | 18,394 | 17,839
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investment available for sale |  | $ 18,394 | $ 17,839
Contingent Consideration Liability [Member] | Discount Rate | Fair Value, Inputs, Level 3 [Member] |  |  |
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 |  | 18.50% |

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