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Significant Accounting Policies (Details 4) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Noncontrolling interests, carrying amounts, reclassified to permanent equity:    
Limited partners' interests in the Operating Partnership $ 1,186,052 $ 953,622
Nonredeemable noncontrolling deficit interests in properties, net (634) (59,000)
Total noncontrolling interests reflected in equity $ 1,185,418 $ 894,622