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Acquired Intangible Assets and Liabilities (Schedule of Estimated Annual Amortization Of Below Market Leases) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]    
Net $ 101,114 $ 104,235
Below Market Leases, Net of Above Market Leases    
Finite-Lived Intangible Assets [Line Items]    
2016 8,403  
2017 6,867  
2018 5,222  
2019 5,285  
2020 7,351  
Thereafter 35,288  
Net $ 68,416