Termination Charges (Details) (USD $)					1 Months Ended	12 Months Ended			12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 Salary and Benefits Continuation [Member]	Dec. 31, 2009 Salary and Benefits Continuation [Member]	Dec. 31, 2011 Employee Severance [Member]	Dec. 31, 2011 Employee Severance [Member]	Dec. 31, 2011 Special Termination Benefits [Member]	Dec. 31, 2009 Special Termination Benefits [Member]	Dec. 31, 2011 Salary and Benefits Continuation AND Special Termination Benefits [Member]	Dec. 31, 2010 Salary and Benefits Continuation AND Special Termination Benefits [Member]	Dec. 31, 2009 Salary and Benefits Continuation AND Special Termination Benefits [Member]	Dec. 31, 2011 Marketing And Reservation Fees	Dec. 31, 2010 Marketing And Reservation Fees	Dec. 31, 2009 Marketing And Reservation Fees
Termination charges												$ 6,600,000	$ 3,300,000	$ 5,400,000
Payments remaining to be remitted			5,800,000	4,700,000
Acceleration Of Share-based Compensation For Terminated Employees							800,000	700,000
Termination benefits unpaid					4,600,000	400,000
Termination Benefits Remitted By Company									4,500,000
Termination benefits expected to be paid within next 12 months	4,522,000	3,269,000							4,500,000
Prior Period Termination Benefits Unpaid											500,000
Termination Benefits Paid For Charges Recorded In Prior Periods										3,200,000
Termination Benefits Included In Liabilities									$ 5,400,000