v2.4.0.6

Summary of Significant Accounting Policies (Other) (Details) (USD $) Share data in Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Accounting Policies [Abstract] |  |  |
Cash and cash equivalents, maturity of qualifying investments, maximum | 3 months |  |
Restricted cash, maturity of qualifying investments, maximum | 90 days |  |
Interest costs capitalized | $ 1,000,000 | $ 400,000 | $ 0
Self Insurance Reserve [Roll Forward] |  |  |
Self insurance reserve, beginning balance | 34,500,000 | 31,721,000 | 27,825,000
Additions |  |  |
Charged to costs and expenses | 103,802,000 | 89,464,000 | 77,307,000
Due to consolidation of Borgata | 0 | 0 | 15,544,000
Due to acquisitions | 359,000 | 1,111,000 | 0
Payments made | 99,998,000 | 87,796,000 | 88,955,000
Self insurance reserve, ending balance | 38,663,000 | 34,500,000 | 31,721,000
Gaming taxes | 270,300,000 | 258,400,000 | 256,500,000
Advertising expense | 38,300,000 | 33,100,000 | 31,800,000
Corporate expense | $ 50,719,000 | $ 48,962,000 | $ 48,861,000
Weighted average shares outstanding: |  |  |
Basic | 87,652 | 87,263 | 86,601
Potential dilutive effect | 0 | 0 | 230
Diluted | 87,652 | 87,263 | 86,831

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