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Non-Controlling Interests, Preferred Shares, Common Shares and Common Shares in Treasury (Details) (USD $)	Dec. 31, 2011	Dec. 31, 2010
Non-controlling interests
Non-controlling interests	$ 21,600,000	$ 27,300,000
Operating partnership units	7,400,000	7,400,000
Non-controlling interests, total	32,208,000	38,085,000
Shopping centers and development parcels in Arizona, Missouri, Utah and Wisconsin [Member]
Non-controlling interests
Non-controlling interests	$ 3,200,000	$ 3,400,000

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest).

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