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Acquired Intangible Assets And Liabilities (Summary Of Acquired Intangible Assets) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]    
Net $ 267,384  
Below-market lease, gross amount 289,475 291,638
Below-market lease, accumulated amortization (171,043) (161,369)
Below-market lease, net 118,432 130,269
Acquired-In Place Lease Value [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Gross amount 718,319 725,458
Accumulated amortization (450,935) (423,549)
Net 267,384 301,909
Acquired Above-Market Lease Value [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Gross amount 131,792 132,750
Accumulated amortization (84,611) (80,486)
Net $ 47,181 $ 52,264