Annual report pursuant to Section 13 and 15(d)

Recent Transactions (Schedule Of Real Estate Held For Sale/Discontinued Operations/Dispositions) (Details)

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Recent Transactions (Schedule Of Real Estate Held For Sale/Discontinued Operations/Dispositions) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Less: Accumulated depreciation $ (656,331) $ (558,617)
Real estate held for sale, net 656,963 966,497
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   235,253
Buildings & Other   1,318,130
Less: Accumulated depreciation   (412,785)
Less: Cumulative unrealized losses on property held for sale   (174,101)
Real estate held for sale, net   966,497
Unbilled rents receivable, net   32,144
Deferred charges, net   34,332
Total intangibles, net   33,095
Total deferred charges & other assets, net   70,414
Mortgages & loans payable, net   123,650
Total below market liability   8,833
Accounts payable, accrued exp & other liability   22,817
Unearned rents/deferred rental income   2,952
Fort Lee, Parsippany, Madison, Short Hills, Edison, Red Bank, Florham Park [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Other Assets Held for Sale [Member]    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Land   87,663
Buildings & Other   54,392
Less: Accumulated depreciation   (11,573)
Less: Cumulative unrealized losses on property held for sale   (36,225)
Real estate held for sale, net   94,257
Unbilled rents receivable, net   1,956
Deferred charges, net   1,432
Total deferred charges & other assets, net   1,730
Accounts payable, accrued exp & other liability   1,792
Parsippany, Madison, Short Hills, Edison, And Red Bank, 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 164,211  
Buildings & Other 779,871  
Less: Accumulated depreciation (169,031)  
Less: Cumulative unrealized losses on property held for sale (118,088)  
Real estate held for sale, net 656,963  
Unbilled rents receivable, net 19,318  
Deferred charges, net 15,981  
Total intangibles, net 26,069  
Total deferred charges & other assets, net 43,178  
Mortgages & loans payable, net 123,768  
Total below market liability 6,538  
Accounts payable, accrued exp & other liability 17,052  
Unearned rents/deferred rental income 8,639  
Parsippany, Madison, Short Hills, Edison, And Red Bank, New Jersey [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Other Assets Held for Sale [Member]    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Land 76,396  
Buildings & Other 42,202  
Less: Accumulated depreciation (7,991)  
Less: Cumulative unrealized losses on property held for sale (40,731)  
Real estate held for sale, net 69,876  
Unbilled rents receivable, net 2,102  
Deferred charges, net 661  
Total deferred charges & other assets, net 665  
Accounts payable, accrued exp & other liability 80  
Unearned rents/deferred rental income 217  
Suburban Office Portfolio [Member] | 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
Buildings & Other   1,263,738
Less: Accumulated depreciation   (401,212)
Less: Cumulative unrealized losses on property held for sale   (137,876)
Real estate held for sale, net   872,240
Unbilled rents receivable, net   30,188
Deferred charges, net   32,900
Total intangibles, net   33,095
Total deferred charges & other assets, net   68,684
Mortgages & loans payable, net   123,650
Total below market liability   8,833
Accounts payable, accrued exp & other liability   21,025
Unearned rents/deferred rental income   $ 2,952
Suburban Office Portfolio [Member] | Parsippany, Madison, Short Hills, Edison, And Red Bank, 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 87,815  
Buildings & Other 737,669  
Less: Accumulated depreciation (161,040)  
Less: Cumulative unrealized losses on property held for sale (77,357)  
Real estate held for sale, net 587,087  
Unbilled rents receivable, net 17,216  
Deferred charges, net 15,320  
Total intangibles, net 26,069  
Total deferred charges & other assets, net 42,513  
Mortgages & loans payable, net 123,768  
Total below market liability 6,538  
Accounts payable, accrued exp & other liability 16,972  
Unearned rents/deferred rental income $ 8,422