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Acquired Intangible Assets And Liabilities (Schedule of Estimated Annual Amortization of Intangible Assets) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Acquired in-place lease value    
Finite-Lived Intangible Assets [Line Items]    
Remainder of 2018 $ 153,591  
2019 148,067  
2020 112,195  
2021 87,579  
2022 65,627  
Thereafter 245,828  
Net 812,887 $ 859,567
Tenant relationships    
Finite-Lived Intangible Assets [Line Items]    
Remainder of 2018 110,349  
2019 142,181  
2020 141,799  
2021 141,799  
2022 141,799  
Thereafter 1,107,402  
Net $ 1,785,329