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Fair Value Measurements (Narrative-Balances Measured at Fair Value) (Details) $ in Millions |  | 6 Months Ended |
--- | --- | --- | ---
Dec. 20, 2011 | Jun. 30, 2015 USD ($) | Dec. 31, 2014 USD ($)
Kansas Star |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Payment to Option Holder, Percentage of EBITDA | 1.00% |  |
Payment to Option Holder, Term | 10 years |  |
Merger Earnout | Kansas Star |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Earnout Threshold, EBITDA of Certain Properties |  | $ 105.0 |
Earnout Multiple |  | 7.5 |
Peninsula Gaming |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale Securities, Current |  | $ 0.4 |
Investment available for sale |  | 16.9 | $ 18.0
Fair Value, Discount Amount, Available for sales securities |  | 3.3 |
Contingent Consideration, Kansas Star earnout |  | 0.0 | 0.1
Business Combination, Contingent Consideration, Liability for Payments to Option Holder, Current |  | 0.9 | 0.9
Business Combination, Contingent Consideration, Liability for Payments to Option Holder, Noncurrent |  | 2.8 | $ 2.9
Carrying Value | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investment available for sale |  | $ 21.4 |

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