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Significant Accounting Policies (Details 4) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Noncontrolling interests, carrying amounts, reclassified to permanent equity:
Limited partners' interests in the Operating Partnership	$ 970,796	$ 983,887
Nonredeemable noncontrolling deficit interests in properties, net	(196,902)	(180,915)
Total noncontrolling interests reflected in equity	$ 773,894	$ 802,972

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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