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, 2017
Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Less - Accumulated depreciation $ (1,087,083) $ (1,332,073)
Rental property held for sale, net 171,578 39,743
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   10,934
Buildings and improvements   68,266
Less - Accumulated depreciation   (31,792)
Less: Unrealized losses on properties held for sale   (7,665)
Rental property held for sale, net   $ 39,743
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