Summary of Significant Accounting Policies (Details) (USD $)	1 Months Ended	12 Months Ended					12 Months Ended
	Jan. 31, 2011	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Aug. 08, 2011 ACDL [Member]	Jan. 31, 2011 River Downs [Member]	Dec. 31, 2011 Allowance for Doubtful Accounts [Member]	Dec. 31, 2010 Allowance for Doubtful Accounts [Member]	Dec. 31, 2009 Allowance for Doubtful Accounts [Member]
Reduction in progressive jackpot liability	$ 4,000,000
Basis of Presentation and Organization and Principles of Consolidation [Abstract]
Business acquisition purchase price						45,200,000
Equity method investment, ownership percentage					26.00%
Equity method investment, aggregate cost					95,000,000
Equity method investment, threshold percentage		50.00%
Balance Sheet Related Disclosures [Abstract]
Cash and cash equivalents		78,597,000	194,925,000
Allowance for doubtful accounts receivable		4,718,000	2,777,000
Bad debt expense							2,908,000	1,144,000	2,230,000
Long-term restricted cash		6,451,000	6,452,000
Indemnification trust		5,700,000	5,700,000
Business Acquisition - Goodwill [Abstract]
Goodwill acquired						35,800,000
Goodwill impairment		0	0	0
Impairment of indefinite-lived intangible assets		0	11,500,000	0
Self insurance reserve		14,800,000	16,900,000
Accrued Liabilities [Abstract]
Accrued customer loyalty program, reward credits		$ 10,800,000	$ 9,500,000