Goodwill and Indefinite-lived Intangible Assets - Goodwill (Details) (USD $)	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 Boomtown New Orleans [Member]	Dec. 31, 2011 River Downs [Member]	Jan. 31, 2011 River Downs [Member]
Goodwill [Line Items]
Goodwill Acquired					$ 35,800,000
Original Value	52,600,000		16,800,000	35,800,000
Accumulated impairment charges	0		0	0
Net book value	$ 52,562,000	$ 16,742,000	$ 16,800,000	$ 35,800,000