Annual report pursuant to Section 13 and 15(d)

Recent Transactions (Schedule Of Disposed Developable Land) (Details)

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Recent Transactions (Schedule Of Disposed Developable Land) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Net Sales Proceeds   $ 18,917  
Net Carrying Value   13,130  
Realized Gains (losses)/Unrealized Losses, net   5,787  
Land impairments $ 23,719 16,817 $ 32,444
Disposal Group, Not Discontinued Operations [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Net Sales Proceeds 5,011    
Net Carrying Value 2,896    
Realized Gains (losses)/Unrealized Losses, net 2,115    
230 & 250 Half Mile Road [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Net Sales Proceeds   7,018  
Net Carrying Value   2,969  
Realized Gains (losses)/Unrealized Losses, net   4,049  
Capital Office Park Land [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Net Sales Proceeds   8,974  
Net Carrying Value   8,210  
Realized Gains (losses)/Unrealized Losses, net   764  
14 & 16 Skyline Drive [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Net Sales Proceeds   2,925  
Net Carrying Value   1,951  
Realized Gains (losses)/Unrealized Losses, net   $ 974  
Horizon Common Area [Member] | Disposal Group, Not Discontinued Operations [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Net Sales Proceeds 745    
Net Carrying Value 634    
Realized Gains (losses)/Unrealized Losses, net 111    
University Ave, 346/360 [Member] | Disposal Group, Not Discontinued Operations [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Net Sales Proceeds 4,266    
Net Carrying Value 2,262    
Realized Gains (losses)/Unrealized Losses, net $ 2,004