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Significant Accounting Policies (Details 4) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Noncontrolling interests, carrying amounts, reclassified to permanent equity:    
Limited partners' interests in the Operating Partnership $ 972,527 $ 983,363
Nonredeemable noncontrolling deficit interests in properties, net (1,029) (877)
Total noncontrolling interests reflected in equity 971,498 982,486
Noncontrolling interests redeemable at amounts in excess of fair value $ 0