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
Mar. 31, 2018
Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Less - Accumulated depreciation $ (1,055,562) $ (1,087,083)
Rental property held for sale, net 38,566 $ 171,578
Paramus And Rochelle Park [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 12,428  
Buildings and improvements 55,809  
Less - Accumulated depreciation (29,671)  
Rental property held for sale, net $ 38,566