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, 2018
Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Less - Accumulated depreciation $ (1,086,215) $ (1,087,083)
Rental property held for sale, net 83,152 $ 171,578
Paramus, Bridgewater, Rochelle Park, 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 23,317  
Buildings and improvements 132,546  
Less - Accumulated depreciation (52,576)  
Less: Unrealized losses on properties held for sale (20,135)  
Rental property held for sale, net $ 83,152