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Acquired Intangible Assets And Liabilities (Summary Of Acquired Intangible Assets) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]    
Net $ 301,909  
Below market lease, gross amount 291,638 285,509
Below market lease, accumulated amortization (161,369) (137,276)
Below market lease, net 130,269 148,233
Acquired In Place Lease Value [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Gross amount 725,458 720,373
Accumulated amortization (423,549) (367,088)
Net 301,909 353,285
Acquired Above-Market Lease Value [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Gross amount 132,750 134,480
Accumulated amortization (80,486) (69,425)
Net $ 52,264 $ 65,055