Quarterly report pursuant to Section 13 or 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
Jun. 30, 2020
Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Less - Accumulated depreciation $ (579,675) $ (558,617)
Rental property held for sale, net 1,078,422 $ 966,497
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 230,623  
Buildings & Other 1,480,215  
Less - Accumulated depreciation (406,354)  
Less: Cumulative unrealized losses on property held for sale (226,062)  
Rental property held for sale, net 1,078,422  
Unbilled rents receivable, net 45,141  
Deferred charges, net 36,945  
Total intangibles, net 67,795  
Total deferred charges & other assets, net 126,865  
Mortgages & loans payable, net 272,388  
Total below market liability 35,997  
Accounts payable, accrued exp & other liability 73,372  
Unearned rents/deferred rental income 5,610  
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 85,472  
Buildings & Other 257,248  
Less - Accumulated depreciation (30,585)  
Less: Cumulative unrealized losses on property held for sale (44,140)  
Rental property held for sale, net 267,995  
Unbilled rents receivable, net 14,885  
Deferred charges, net 4,305  
Total intangibles, net 35,417  
Total deferred charges & other assets, net 59,064  
Mortgages & loans payable, net 148,679  
Total below market liability 28,334  
Accounts payable, accrued exp & other liability 50,793  
Unearned rents/deferred rental income 1,364  
Suburban Office Portfolio [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 145,151  
Buildings & Other 1,222,967  
Less - Accumulated depreciation (375,769)  
Less: Cumulative unrealized losses on property held for sale (181,922)  
Rental property held for sale, net 810,427  
Unbilled rents receivable, net 30,256  
Deferred charges, net 32,640  
Total intangibles, net 32,378  
Total deferred charges & other assets, net 67,801  
Mortgages & loans payable, net 123,709  
Total below market liability 7,663  
Accounts payable, accrued exp & other liability 22,579  
Unearned rents/deferred rental income $ 4,246