Annual report pursuant to Section 13 and 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
Dec. 31, 2018
Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Less - Accumulated depreciation $ (1,097,868) $ (1,087,083)
Rental property held for sale, net 108,848 171,578
Fort Lee, Newark, Paramus, Bridgewater, Morris Plains And Rahway, New Jersey [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 24,376  
Buildings and improvements 159,857  
Less - Accumulated depreciation (55,250)  
Less: Unrealized losses on properties held for sale (20,135)  
Rental property held for sale, net $ 108,848  
Parsippany, Paramus, Rochelle Park, Hamilton And Wall, New Jersey And White Plains, New York [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   37,024
Buildings and improvements   273,388
Less - Accumulated depreciation   (126,503)
Less: Unrealized losses on properties held for sale   (12,331)
Rental property held for sale, net   $ 171,578