Annual report pursuant to Section 13 and 15(d)

Recent Transactions (Schedule Of Disposed Properties) (Details)

v3.22.0.1
Recent Transactions (Schedule Of Disposed Properties) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
USD ($)
ft²
item
shares
Dec. 31, 2020
USD ($)
ft²
item
Dec. 31, 2019
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Rentable Square Feet (sf) | ft² 3,049,313 2,725,639  
Area of property (in square feet) | ft² 3,049,313 2,725,639  
Valuation allowance $ 29,200    
Redemption of common units, shares | shares 53,000    
Value of units redeemed $ 900    
100 Overlook Center [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Rentable Square Feet (sf) | ft² 149,600    
Area of property (in square feet) | ft² 149,600    
Metropark Portfolio [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Rentable Square Feet (sf) | ft² 926,656    
Area of property (in square feet) | ft² 926,656    
Short Hills Portfolio [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Rentable Square Feet (sf) | ft² 828,413    
Area of property (in square feet) | ft² 828,413    
Red Bank Portfolio [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Rentable Square Feet (sf) | ft² 659,490    
Area of property (in square feet) | ft² 659,490    
7 Giralda Farms [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Rentable Square Feet (sf) | ft² 236,674    
Area of property (in square feet) | ft² 236,674    
4 Gatehall Drive [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Rentable Square Feet (sf) | ft² 248,480    
Area of property (in square feet) | ft² 248,480    
One Bridge Plaza [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Rentable Square Feet (sf) | ft²   200,000  
Area of property (in square feet) | ft²   200,000  
Giralda Farms, 3 [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Rentable Square Feet (sf) | ft²   141,000  
Area of property (in square feet) | ft²   141,000  
Morris Portfolio [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Rentable Square Feet (sf) | ft²   1,448,420  
Area of property (in square feet) | ft²   1,448,420  
Columbia Turnpike, 325 [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Rentable Square Feet (sf) | ft²   168,144  
Area of property (in square feet) | ft²   168,144  
Campus Drive, 9 [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Rentable Square Feet (sf) | ft²   156,945  
Area of property (in square feet) | ft²   156,945  
Vaughn Drive, 3&5 [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Rentable Square Feet (sf) | ft²   98,500  
Area of property (in square feet) | ft²   98,500  
Campus Drive, 7 [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Rentable Square Feet (sf) | ft²   154,395  
Area of property (in square feet) | ft²   154,395  
Main Street, 581 [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Rentable Square Feet (sf) | ft²   200,000  
Area of property (in square feet) | ft²   200,000  
College Road, 500 [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Rentable Square Feet (sf) | ft²   158,235  
Area of property (in square feet) | ft²   158,235  
Dennis St, 5/10 And 100 Hiram Sq [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Rentable Square Feet (sf) | ft²   200  
Area of property (in square feet) | ft²   200  
Disposal Group, Not Discontinued Operations [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of buildings | item 16 20  
Net Sales Proceeds $ 711,270 $ 370,754  
Net Carrying Value 682,696 338,350  
Realized Gains (Losses)/Unrealized Losses, net $ 3,022 7,163  
Gain (Loss) on Disposition Of Real Estate, Net   5,481  
Unrealized gains (losses) on real estate held for sale   $ (1,682)  
Disposal Group, Not Discontinued Operations [Member] | 100 Overlook Center [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of buildings | item 1    
Net Sales Proceeds $ 34,724    
Net Carrying Value $ 26,488    
Redemption of common units, shares | shares 678,302    
Value of units redeemed $ 10,500    
Disposal Group, Not Discontinued Operations [Member] | Metropark Portfolio [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of buildings | item 4    
Net Sales Proceeds $ 247,351    
Net Carrying Value 233,826    
Notes receivable to an affiliate $ 10,000    
Disposal Group, Not Discontinued Operations [Member] | Short Hills Portfolio [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of buildings | item 4    
Net Sales Proceeds $ 248,664    
Net Carrying Value 245,800    
Payment for Debt Extinguishment or Debt Prepayment Cost $ 22,600    
Disposal Group, Not Discontinued Operations [Member] | Red Bank Portfolio [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of buildings | item 5    
Net Sales Proceeds $ 80,730    
Net Carrying Value 78,364    
Disposal Group, Not Discontinued Operations [Member] | Retail Land Leases [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Net Sales Proceeds 41,957    
Net Carrying Value 37,951    
Realized Gains (Losses)/Unrealized Losses, net $ 4,006    
Disposal Group, Not Discontinued Operations [Member] | 7 Giralda Farms [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of buildings | item 1    
Net Sales Proceeds $ 28,182    
Net Carrying Value $ 30,143    
Disposal Group, Not Discontinued Operations [Member] | 4 Gatehall Drive [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of buildings | item 1    
Net Sales Proceeds $ 24,239    
Net Carrying Value 23,717    
Disposal Group, Not Discontinued Operations [Member] | Retail land lease Unit B [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Net Sales Proceeds 5,423    
Net Carrying Value 6,407    
Realized Gains (Losses)/Unrealized Losses, net (984)    
Disposal Group, Not Discontinued Operations [Member] | One Bridge Plaza [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of buildings | item   1  
Net Sales Proceeds   $ 35,065  
Net Carrying Value   $ 17,743  
Disposal Group, Not Discontinued Operations [Member] | Giralda Farms, 3 [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of buildings | item   1  
Net Sales Proceeds   $ 7,510  
Net Carrying Value   $ 9,534  
Disposal Group, Not Discontinued Operations [Member] | Morris Portfolio [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of buildings | item   10  
Net Sales Proceeds   $ 155,116  
Net Carrying Value   $ 175,772  
Disposal Group, Not Discontinued Operations [Member] | Columbia Turnpike, 325 [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of buildings | item   1  
Net Sales Proceeds   $ 24,276  
Net Carrying Value   $ 8,020  
Disposal Group, Not Discontinued Operations [Member] | Campus Drive, 9 [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of buildings | item   1  
Net Sales Proceeds   $ 20,678  
Net Carrying Value   $ 22,162  
Valuation allowance     $ 3,500
Disposal Group, Not Discontinued Operations [Member] | Vaughn Drive, 3&5 [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of buildings | item   1  
Net Sales Proceeds   $ 7,282  
Net Carrying Value   $ 5,754  
Disposal Group, Not Discontinued Operations [Member] | Campus Drive, 7 [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of buildings | item   1  
Net Sales Proceeds   $ 12,278  
Net Carrying Value   $ 11,804  
Disposal Group, Not Discontinued Operations [Member] | Main Street, 581 [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of buildings | item   1  
Net Sales Proceeds   $ 58,400  
Net Carrying Value   $ 43,113  
Disposal Group, Not Discontinued Operations [Member] | College Road, 500 [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of buildings | item   1  
Net Sales Proceeds   $ 4,582  
Net Carrying Value   $ 6,044  
Disposal Group, Not Discontinued Operations [Member] | Dennis St, 5/10 And 100 Hiram Sq [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of buildings | item   2  
Net Sales Proceeds   $ 45,567  
Net Carrying Value   38,404  
Realized Gains (Losses)/Unrealized Losses, net   7,163  
Discontinued Operations [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Realized Gains (losses)/Unrealized Losses, net   25,241  
Unrealized gains (losses) on real estate held for sale 3,700 (14,040)  
Totals 25,552 11,201  
Discontinued Operations [Member] | 100 Overlook Center [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Realized Gains (losses)/Unrealized Losses, net 8,236    
Discontinued Operations [Member] | Metropark Portfolio [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Realized Gains (losses)/Unrealized Losses, net 13,525    
Discontinued Operations [Member] | Short Hills Portfolio [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Realized Gains (losses)/Unrealized Losses, net 2,864    
Discontinued Operations [Member] | Red Bank Portfolio [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Realized Gains (losses)/Unrealized Losses, net 2,366    
Discontinued Operations [Member] | 7 Giralda Farms [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Realized Gains (losses)/Unrealized Losses, net (1,961)    
Discontinued Operations [Member] | 4 Gatehall Drive [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Realized Gains (losses)/Unrealized Losses, net $ 522    
Discontinued Operations [Member] | One Bridge Plaza [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Realized Gains (losses)/Unrealized Losses, net   17,322  
Discontinued Operations [Member] | Giralda Farms, 3 [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Realized Gains (losses)/Unrealized Losses, net   (2,024)  
Discontinued Operations [Member] | Morris Portfolio [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Realized Gains (losses)/Unrealized Losses, net   (20,656)  
Discontinued Operations [Member] | Columbia Turnpike, 325 [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Realized Gains (losses)/Unrealized Losses, net   16,256  
Discontinued Operations [Member] | Campus Drive, 9 [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Realized Gains (losses)/Unrealized Losses, net   (1,484)  
Discontinued Operations [Member] | Vaughn Drive, 3&5 [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Realized Gains (losses)/Unrealized Losses, net   1,528  
Discontinued Operations [Member] | Campus Drive, 7 [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Realized Gains (losses)/Unrealized Losses, net   474  
Discontinued Operations [Member] | Main Street, 581 [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Realized Gains (losses)/Unrealized Losses, net   15,287  
Discontinued Operations [Member] | College Road, 500 [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Realized Gains (losses)/Unrealized Losses, net   (1,462)  
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Giralda Farms, 3 [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Valuation allowance   2,000 16,700
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Morris Portfolio [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Valuation allowance   21,600 32,500
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Campus Drive, 7 [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Valuation allowance   $ 6,000  
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | College Road, 500 [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Valuation allowance     $ 1,900