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, 2021
Dec. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Less: Accumulated depreciation $ (693,868) $ (656,331)
Real estate held for sale, net 84,834 $ 656,963
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 54,363  
Buildings & Other 107,700  
Less: Accumulated depreciation (32,294)  
Less: Cumulative unrealized losses on property held for sale (44,935)  
Real estate held for sale, net 84,834  
Unbilled rents receivable, net 1,915  
Deferred charges, net 1,701  
Total intangibles, net 3,377  
Total deferred charges & other assets, net 5,850  
Total below market liability 86  
Accounts payable, accrued exp & other liability 7,283  
Unearned rents/deferred rental income 1,156  
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 40,509  
Buildings & Other 24,291  
Less: Accumulated depreciation (7,991)  
Less: Cumulative unrealized losses on property held for sale (17,187)  
Real estate held for sale, net 39,622  
Deferred charges, net 138  
Total deferred charges & other assets, net 138  
Accounts payable, accrued exp & other liability 265  
Unearned rents/deferred rental income 213  
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 13,854  
Buildings & Other 83,409  
Less: Accumulated depreciation (24,303)  
Less: Cumulative unrealized losses on property held for sale (27,748)  
Real estate held for sale, net 45,212  
Unbilled rents receivable, net 1,915  
Deferred charges, net 1,563  
Total intangibles, net 3,377  
Total deferred charges & other assets, net 5,712  
Total below market liability 86  
Accounts payable, accrued exp & other liability 7,018  
Unearned rents/deferred rental income $ 943