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Basis Of Presentation and Summary of Significant Accounting Policies - Property, Plant and Equipment (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Grandstands and buildings | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life | 10 years |  |
Grandstands and buildings | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life | 40 years |  |
Equipment | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life | 2 years |  |
Equipment | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life | 10 years |  |
Furniture and fixtures | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life | 2 years |  |
Furniture and fixtures | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life | 10 years |  |
Tracks and other improvements | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life | 10 years |  |
Tracks and other improvements | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life | 20 years |  |
Internal use software |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Capitalized internal use software | $ 8.9 | $ 7.4 | $ 7.4
Estimated useful life of capitalized costs | 3 years |  |
Capitalized costs, amortization | $ 7.0 | $ 6.0 | $ 5.1
Game technology and rights, premium paid game |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Intangible asset estimated useful life | 1 year |  |
Game technology and rights, casual and mid-core free-to-play games |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Intangible asset estimated useful life | 18 months |  |

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