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Acquired Intangible Assets and Liabilities (Schedule of Estimated Annual Amortization Of Below Market Leases) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]    
Net $ 81,899 $ 101,114
Below-Market Leases, Net of Above Market Leases    
Finite-Lived Intangible Assets [Line Items]    
2017 7,216  
2018 5,566  
2019 5,698  
2020 7,422  
2021 7,114  
Thereafter 26,702  
Net $ 59,718