Quarterly report pursuant to Section 13 or 15(d)

Commitments And Contingencies (Construction Projects) (Narrative) (Details)

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Commitments And Contingencies (Construction Projects) (Narrative) (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
item
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
item
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Commitments And Contingencies [Line Items]          
Costs of the project incurred $ 3,151 $ 3,113 $ 7,243 $ 6,966  
Amount outstanding $ 189,000   189,000   $ 25,000
Port Imperial South 9 [Member]          
Commitments And Contingencies [Line Items]          
Construction costs incurred     $ 125,800    
Delivery date to tenant     July 2021    
Number of units | item 313   313    
Amount outstanding $ 74,000   $ 74,000    
Total project costs     143,800    
Amount to fund $ 51,800   51,800    
25 Christopher Columbus [Member]          
Commitments And Contingencies [Line Items]          
Construction costs incurred     $ 383,800    
Delivery date to tenant     first quarter 2022    
Number of units | item 750   750    
Amount outstanding $ 214,300   $ 214,300    
Total project costs     469,500    
Amount to fund 169,500   169,500    
Construction Loan [Member] | Port Imperial South 9 [Member]          
Commitments And Contingencies [Line Items]          
Amount outstanding 92,000   92,000    
Construction Loan [Member] | 25 Christopher Columbus [Member]          
Commitments And Contingencies [Line Items]          
Amount outstanding $ 300,000   $ 300,000