Summary Of Significant Accounting Policies (Estimated Useful Lives Of Assets) (Details)	12 Months Ended
	Dec. 31, 2011
Summary Of Significant Accounting Policies [Line Items]
Leasehold improvements	Shorter of useful lives or the terms of the leases
Buildings [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated Useful Life Years, minimum	15
Estimated Useful Life Years, maximum	45
Building Improvements [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated Useful Life Years, minimum	5
Estimated Useful Life Years, maximum	20
Furniture, Fixtures, And Equipment [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated Useful Life Years, minimum	3
Estimated Useful Life Years, maximum	25