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Acquisitions And New Ventures Acquisitions And New Ventures (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended | 1 Months Ended | 12 Months Ended |  |  |  | 3 Months Ended | 6 Months Ended |  | 1 Months Ended | 6 Months Ended | 12 Months Ended |
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Mar. 31, 2012 Miami Valley Gaming and Racing [Member] | Dec. 31, 2012 Miami Valley Gaming and Racing [Member] acre sqft mi | Dec. 21, 2012 Notes Payable, Other Payables [Member] Miami Valley Gaming and Racing [Member] mi | Dec. 31, 2012 Minimum Miami Valley Gaming and Racing [Member] terminal | Dec. 31, 2012 Maximum Miami Valley Gaming and Racing [Member] terminal | Jul. 17, 2013 Oxford Acquisition [Member] sqft | Jun. 30, 2013 Riverwalk Acquisition [Member] | Jun. 30, 2012 Riverwalk Acquisition [Member] | Jun. 30, 2013 Riverwalk Acquisition [Member] | Jun. 30, 2012 Riverwalk Acquisition [Member] | Oct. 23, 2012 Riverwalk Acquisition [Member] sqft hotel_rooms acre | Mar. 31, 2012 Ohio Joint Venture [Member] | Jun. 30, 2013 Ohio Joint Venture [Member] | Dec. 31, 2012 Ohio Joint Venture [Member] | Dec. 31, 2012 License Fee Payable [Member] Miami Valley Gaming and Racing [Member]
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Race Track, Length |  |  |  |  |  | 0.625 |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Pro Forma Revenue |  |  |  |  |  |  |  |  |  |  |  | $ 284,641,000 |  | $ 437,546,000 |  |  |  |  |
Square Footage of Event Center |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,600 |  |  |  |
Acres |  |  |  |  |  | 120 |  |  |  |  |  |  |  |  | 22 |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | 14,100,000 |  | 28,200,000 |  |  |  |  |  |
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest | 81,327,000 | 80,709,000 | 82,697,000 | 83,037,000 |  |  |  |  |  |  | 3,300,000 |  | 6,500,000 |  |  |  |  |  |
Purchase price of the entity to be acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 145,600,000 |  |  |  |
Square footage of Casino |  |  |  |  |  | 186,000 |  |  |  | 25,000 |  |  |  |  | 25,000 |  |  |  |
Number of Hotel rooms |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 80 |  |  |  |
Ownership In Joint Venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |
Maximum Amount Of Contributions Needed To Fund Asset Purchase For Existing Racing Licenses And Racetrack Assets, License Fees and Acquisition Costs For Land |  |  |  |  |  | 80,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
FutureCapital ExpendituresOnDevelopingAndConstructingFacility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 142,000,000 |
Future Business Acquisition, Cost Of Acquired Entity, Purchase Price |  |  |  |  |  |  |  |  |  | 160,000,000 |  |  |  |  |  | 60,000,000 |  |  |
Future Business Acquisition, Cost of Acquired Entity, Cash That Will Be Paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 |  |  |
Equity Method Investments |  |  |  |  |  |  | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Fair value of earn-out liability and accrued purchase price |  |  | 0 | (2,331,000) |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 |  |  |
Distance to nearest gaming facility |  |  |  |  |  |  | 50 |  |  |  |  |  |  |  |  |  |  |  |
Contingent condiseration payment term |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Lottery Terminals |  |  |  |  |  |  |  | 1,600 | 1,800 |  |  |  |  |  |  |  |  |  |
Equity Method Investments, Facility Cost |  |  |  |  |  | 212,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000
Payments to Acquire Interest in Joint Venture |  |  | 12,500,000 | 5,400,000 |  |  |  |  |  |  |  |  |  |  |  |  | 12,500,000 |  |
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax |  |  |  |  |  |  |  |  |  |  |  | $ 50,302,000 |  | $ 54,188,000 |  |  |  |  |
Business Acquisition, Pro Forma Earnings Per Share, Basic |  |  |  |  |  |  |  |  |  |  |  | $ 2.92 |  | $ 3.15 |  |  |  |  |
Business Acquisition, Pro Forma Earnings Per Share, Diluted |  |  |  |  |  |  |  |  |  |  |  | $ 2.87 |  | $ 3.11 |  |  |  |  |
Weighted Average Basic Shares Outstanding, Pro Forma |  |  |  |  |  |  |  |  |  |  |  | 16,978 |  | 16,940 |  |  |  |  |
Pro Forma Weighted Average Shares Outstanding, Diluted |  |  |  |  |  |  |  |  |  |  |  | 17,502 |  | 17,443 |  |  |  |  |

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