Commitments and Contingencies (Details) (USD $)	3 Months Ended		6 Months Ended				1 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011	Sep. 11, 2008 Breach in pre-development agreement Kansas Penn Gaming, LLC	Sep. 30, 2008 Breach in pre-development agreement Kansas Penn Gaming, LLC Minimum	Jun. 30, 2012 Pending Litigation Argosy Casino Sioux City facility Belle of Sioux City, L.P. (the "Belle")
Litigation
Goodwill and other intangible assets								$ 92,800,000
Property and equipment, net	2,420,087,000		2,420,087,000		2,277,200,000			10,900,000
Net revenues	712,551,000	687,879,000	1,448,610,000	1,354,902,000				29,800,000
Income from operations	128,015,000	140,592,000	270,630,000	263,327,000				9,600,000
Net revenues, percentage								2.10%
Income from operations, percentage								3.50%
Damages sought value							50,000,000
Privilege fee paid in conjunction with the gaming application for the Cherokee County zone						$ 25,000,000