Summary of Significant Accounting Policies (Promotional Allowances) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Allowances [Line Items]
Promotional allowances	$ 110,553	$ 100,474	$ 221,179	$ 199,162
Cost of promotional allowances	67,093	54,985	126,492	110,340
Rooms
Allowances [Line Items]
Promotional allowances	35,991	30,718	70,673	60,822
Cost of promotional allowances	15,352	13,044	29,099	26,117
Food and Beverage
Allowances [Line Items]
Promotional allowances	46,821	41,070	95,119	83,564
Cost of promotional allowances	45,279	37,752	85,507	76,237
Other Products and Services
Allowances [Line Items]
Promotional allowances	27,741	28,686	55,387	54,776
Cost of promotional allowances	$ 6,462	$ 4,189	$ 11,886	$ 7,986