Quarterly report pursuant to Section 13 or 15(d)

Recent Transactions (Summary Of Income From Property Held For Sale, Net) (Details)

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Recent Transactions (Summary Of Income From Property Held For Sale, Net) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Less - Accumulated depreciation $ (896,777) $ (1,097,868)
Rental property held for sale, net 384,138 $ 108,848
Fort Lee, Parsippany, Hanover And Neptune, New Jersey, And Malden And Revere, Massachusetts [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member]    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Land 96,586  
Buildings and improvements 426,349  
Less - Accumulated depreciation (103,718)  
Less: Cumulative unrealized losses on property held for sale (35,079)  
Rental property held for sale, net $ 384,138