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Acquired Intangible Assets And Liabilities (Summary Of Acquired Intangible Assets) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]    
Below market lease, gross amount $ 288,658 $ 285,509
Below market lease, accumulated amortization (155,033) (137,276)
Below market lease, net 133,625 148,233
Acquired In Place Lease Value [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Gross amount 717,158 720,373
Accumulated amortization (405,993) (367,088)
Net 311,165 353,285
Acquired Above-Market Lease Value [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Gross amount 131,585 134,480
Accumulated amortization (77,139) (69,425)
Net $ 54,446 $ 65,055