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
Sep. 30, 2020
Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Less: Accumulated depreciation $ (627,995) $ (558,617)
Real estate held for sale, net 714,404 $ 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 189,064  
Buildings & Other 902,776  
Less: Accumulated depreciation (227,848)  
Less: Cumulative unrealized losses on property held for sale (149,588)  
Real estate held for sale, net 714,404  
Unbilled rents receivable, net 24,255  
Deferred charges, net 22,309  
Total intangibles, net 26,208  
Total deferred charges & other assets, net 51,202  
Mortgages & loans payable, net 123,738  
Total below market liability 7,092  
Accounts payable, accrued exp & other liability 20,819  
Unearned rents/deferred rental income 4,768  
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 84,180  
Buildings & Other 40,290  
Less: Accumulated depreciation (7,991)  
Less: Cumulative unrealized losses on property held for sale (44,140)  
Real estate held for sale, net 72,339  
Unbilled rents receivable, net 2,048  
Deferred charges, net 773  
Total deferred charges & other assets, net 789  
Accounts payable, accrued exp & other liability 255  
Unearned rents/deferred rental income 203  
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 104,884  
Buildings & Other 862,486  
Less: Accumulated depreciation (219,857)  
Less: Cumulative unrealized losses on property held for sale (105,448)  
Real estate held for sale, net 642,065  
Unbilled rents receivable, net 22,207  
Deferred charges, net 21,536  
Total intangibles, net 26,208  
Total deferred charges & other assets, net 50,413  
Mortgages & loans payable, net 123,738  
Total below market liability 7,092  
Accounts payable, accrued exp & other liability 20,564  
Unearned rents/deferred rental income $ 4,565