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Acquired Intangible Assets And Liabilities (Summary Of Acquired Intangible Assets) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]    
Net $ 283,172  
Below-market lease, gross amount 290,365 291,638
Below-market lease, accumulated amortization (167,213) (161,369)
Below-market lease, net 123,152 130,269
Acquired-In Place Lease Value [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Gross amount 721,961 725,458
Accumulated amortization (438,789) (423,549)
Net 283,172 301,909
Acquired Above-Market Lease Value [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Gross amount 133,064 132,750
Accumulated amortization (83,543) (80,486)
Net $ 49,521 $ 52,264