Quarterly report pursuant to Section 13 or 15(d)

Recent Transactions (Schedule Of Disposed Properties) (Details)

v3.19.3
Recent Transactions (Schedule Of Disposed Properties) (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Apr. 01, 2019
USD ($)
item
Mar. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
ft²
item
property
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Valuation allowance     $ 9,500   $ 5,300
Number Of Units | item     208    
Jersey City, New Jersey [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Number Of Units | item 377        
Funds from qualified intermediary $ 217,400        
Disposal Group, Not Discontinued Operations [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Number of Buildings, Disposed | item     63    
Rentable Square Feet, Disposed | ft²     3,993,538    
Net Sales Proceeds     $ 593,436    
Net Carrying Value     325,072    
Realized Gains (losses)/Unrealized Losses, net     268,364    
Unrealized losses on rental properties held for sale     (35,079)    
Totals     $ 233,285    
Disposal Group, Not Discontinued Operations [Member] | 721 Route 202/206 South [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Number of Buildings, Disposed | item     1    
Rentable Square Feet, Disposed | ft²     192,741    
Net Sales Proceeds     $ 5,651    
Net Carrying Value     5,410    
Realized Gains (losses)/Unrealized Losses, net     $ 241    
Valuation allowance       $ 9,300  
Disposal Group, Not Discontinued Operations [Member] | Park Square Apartments [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Number of Buildings, Disposed | item     1    
Rentable Square Feet, Disposed | ft²     159    
Net Sales Proceeds     $ 34,045    
Net Carrying Value     34,032    
Realized Gains (losses)/Unrealized Losses, net     $ 13    
Valuation allowance       6,300  
Disposal Group, Not Discontinued Operations [Member] | 2115 Linwood Avenue [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Number of Buildings, Disposed | item     1    
Rentable Square Feet, Disposed | ft²     68,000    
Net Sales Proceeds     $ 15,197    
Net Carrying Value     7,433    
Realized Gains (losses)/Unrealized Losses, net     $ 7,764    
Disposal Group, Not Discontinued Operations [Member] | 201 Littleton Road [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Number of Buildings, Disposed | item     1    
Rentable Square Feet, Disposed | ft²     88,369    
Net Sales Proceeds     $ 4,842    
Net Carrying Value     4,937    
Realized Gains (losses)/Unrealized Losses, net     $ (95)    
Valuation allowance       3,600  
Disposal Group, Not Discontinued Operations [Member] | 320 & 321 University Avenue [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Number of Buildings, Disposed | item     2    
Rentable Square Feet, Disposed | ft²     147,406    
Net Sales Proceeds     $ 25,552    
Net Carrying Value     18,456    
Realized Gains (losses)/Unrealized Losses, net     $ 7,096    
Disposal Group, Not Discontinued Operations [Member] | 650 From Road [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Number of Buildings, Disposed | item     1    
Rentable Square Feet, Disposed | ft²     348,510    
Net Sales Proceeds     $ 37,801    
Net Carrying Value     40,046    
Realized Gains (losses)/Unrealized Losses, net     $ (2,245)    
Valuation allowance       $ 900  
Disposal Group, Not Discontinued Operations [Member] | Flex Portfolio [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Number of Buildings, Disposed | item     56    
Number of properties Disposed | property     2    
Rentable Square Feet, Disposed | ft²     3,148,512    
Net Sales Proceeds     $ 470,348    
Net Carrying Value     214,758    
Realized Gains (losses)/Unrealized Losses, net     255,590    
Carrying Amount of Mortgages     350,000    
Proceeds from sale of properties   $ 6,600 6,600    
Disposal Group, Not Discontinued Operations [Member] | Unsecured Revolving Credit Facility [Member] | Flex Portfolio [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Carrying Amount of Mortgages     119,900    
Repayment of mortgage loans     $ 90,000