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Investment in and Advances to Unconsolidated Affiliates (Details) $ in Millions |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 21, 2012 USD ($) | Mar. 31, 2016 USD ($) terminal | Mar. 31, 2015 USD ($) | Dec. 31, 2015 USD ($) ft² a mi | Dec. 31, 2012 USD ($)
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |
Long-term debt, excluding current portion |  | $ 18.9 |  | $ 20.5 | $ 50.0
Dividend from investment in unconsolidated affiliates |  | $ 4.0 | $ 3.5 |  |
Miami Valley Gaming and Racing [Member] |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  | 50.00% |
Equity Method Investments | $ 60.0 |  |  |  |
Note Payable, Term | 6 years |  |  |  |
Equity Method Investments, Contingent Payable | $ 10.0 |  |  |  |
Financial Performance Period To Determine Potential Contingent Consideration Payment | 7 years |  |  |  |
Acres | a |  |  |  | 120 |
Race Track, Length | mi |  |  |  | 0.625 |
Square footage of Casino | ft² |  |  |  | 186,000 |
Number of Lottery Terminals | terminal |  | 1,770 |  |  |
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate |  | 5.00% |  |  |
Funded at Closing [Member] | Miami Valley Gaming and Racing [Member] |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |
Equity Method Investments | $ 10.0 |  |  |  |
Notes Payable, Other Payables [Member] | Miami Valley Gaming and Racing [Member] |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |
Equity Method Investments | $ 50.0 |  |  |  |

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