Development of Rental Properties Redevelopment of Existing Outlet Centers (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Capitalized Interest [Line Items]
Interest Costs Incurred, Capitalized	$ 64,000	$ 583,000	$ 302,000	$ 1,100,000
Square Footage of Center Under Redevelopment	177,000		177,000
Percent of Leasable Area of Redeveloped Center Signed or Out for Signature	96.00%		96.00%
Construction Commitments	$ 5,500,000		$ 5,500,000
Number of Pad Sites at Center Under Redevlopment	4		4
Number of Pad Sites at Center Under Redevelopment, Leased	3		3