Summary of Significant Accounting Policies (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Revenue recognition
Promotional allowances	$ 35,864,000	$ 33,422,000	$ 72,233,000	$ 64,116,000
Cost of complimentary services	21,911,000	22,095,000	44,269,000	43,082,000
Gaming and Racing Taxes
Gaming expense	266,600,000	270,400,000	543,500,000	534,500,000
Rooms
Revenue recognition
Promotional allowances	6,265,000	5,528,000	12,559,000	10,739,000
Cost of complimentary services	2,307,000	2,010,000	4,663,000	4,024,000
Food and beverage
Revenue recognition
Promotional allowances	27,236,000	25,461,000	54,715,000	48,689,000
Cost of complimentary services	18,175,000	18,645,000	36,655,000	36,264,000
Other
Revenue recognition
Promotional allowances	2,363,000	2,433,000	4,959,000	4,688,000
Cost of complimentary services	$ 1,429,000	$ 1,440,000	$ 2,951,000	$ 2,794,000