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 ($)
Dec. 31, 2019
Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Less - Accumulated depreciation $ (558,617,000) $ (1,097,868,000)
Rental property held for sale, net 966,497,000 108,848,000
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 235,253,000  
Buildings & Other 1,318,130,000  
Less - Accumulated depreciation (412,785,000)  
Less: Cumulative unrealized losses on property held for sale (174,101,000)  
Rental property held for sale, net 966,497,000  
Unbilled rents receivable, net 32,144,000  
Deferred charges, net 34,332,000  
Total intangibles, net 33,095,000  
Total deferred charges & other assets, net 70,414,000  
Mortgages & loans payable, net 123,650,000  
Total below market liability 8,833,000  
Accounts payable, accrued exp & other liability 22,817,000  
Unearned rents/deferred rental income 2,952,000  
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   24,376,000
Buildings & Other   159,857,000
Less - Accumulated depreciation   (55,250,000)
Less: Cumulative unrealized losses on property held for sale   (20,135,000)
Rental property held for sale, net   108,848,000
Unbilled rents receivable, net   1,700,000
Total deferred charges & other assets, net   2,900,000
Accounts payable, accrued exp & other liability   $ 2,300,000
Fort Lee, Parsippany, Madison, Short Hills, Edison, Red Bank, Florham 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 147,590,000  
Buildings & Other 1,263,738,000  
Less - Accumulated depreciation (401,212,000)  
Less: Cumulative unrealized losses on property held for sale (137,876,000)  
Rental property held for sale, net 872,240,000  
Unbilled rents receivable, net 30,188,000  
Deferred charges, net 32,900,000  
Total intangibles, net 33,095,000  
Total deferred charges & other assets, net 68,684,000  
Mortgages & loans payable, net 123,650,000  
Total below market liability 8,833,000  
Accounts payable, accrued exp & other liability 21,025,000  
Unearned rents/deferred rental income 2,952,000  
Other Assets Held, Assets Held For Sale [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 87,663,000  
Buildings & Other 54,392,000  
Less - Accumulated depreciation (11,573,000)  
Less: Cumulative unrealized losses on property held for sale (36,225,000)  
Rental property held for sale, net 94,257,000  
Unbilled rents receivable, net 1,956,000  
Deferred charges, net 1,432,000  
Total deferred charges & other assets, net 1,730,000  
Accounts payable, accrued exp & other liability $ 1,792,000