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, 2021
Dec. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Less: Accumulated depreciation $ (561,240) $ (656,331)
Real estate held for sale, net 497,832 $ 656,963
Assets Held-for-sale, Not Part of Disposal Group, Right of Use Assets 19,200  
Assets Held-for-sale, Not Part of Disposal Group, Right of Use Liabilities 20,500  
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 103,451  
Buildings & Other 608,530  
Less: Accumulated depreciation (187,581)  
Less: Cumulative unrealized losses on property held for sale (26,568)  
Real estate held for sale, net 497,832  
Unbilled rents receivable, net 30,510  
Deferred charges, net 17,827  
Total intangibles, net 31,155  
Total deferred charges & other assets, net 69,691  
Mortgages & loans payable, net 397,867  
Total below market liability 24,627  
Accounts payable, accrued exp & other liability 56,079  
Unearned rents/deferred rental income 7,735  
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 94,999  
Buildings & Other 564,080  
Less: Accumulated depreciation (167,529)  
Less: Cumulative unrealized losses on property held for sale (16,806)  
Real estate held for sale, net 474,744  
Unbilled rents receivable, net 30,083  
Deferred charges, net 16,988  
Total intangibles, net 31,155  
Total deferred charges & other assets, net 67,964  
Mortgages & loans payable, net 397,867  
Total below market liability 24,627  
Accounts payable, accrued exp & other liability 50,547  
Unearned rents/deferred rental income 6,926  
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 8,452  
Buildings & Other 44,450  
Less: Accumulated depreciation (20,052)  
Less: Cumulative unrealized losses on property held for sale (9,762)  
Real estate held for sale, net 23,088  
Unbilled rents receivable, net 427  
Deferred charges, net 839  
Total deferred charges & other assets, net 1,727  
Accounts payable, accrued exp & other liability 5,532  
Unearned rents/deferred rental income $ 809