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Summary Of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2011
Summary Of Significant Accounting Policies [Abstract]  
Schedule Of Carrying Value Of Variable Interest Entities
Useful Lives Of Related Real Estate And Other Assets

Buildings and improvements

     37.4 years   

Tenant lease intangibles

     14.1 years   

Tenant improvements

     5.4 years   

Furniture, equipment and other

     9.3 years