Annual report pursuant to Section 13 and 15(d)

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

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Commitments And Contingencies (Construction Projects) (Narrative) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
item
Dec. 31, 2018
USD ($)
item
Dec. 31, 2017
USD ($)
Mar. 26, 2019
item
Commitments And Contingencies [Line Items]        
Costs of the project incurred $ 17,881 $ 23,799 $ 29,493  
Number of units | item 208 1,317    
Amount outstanding $ 329,000 $ 790,939    
XS Hotel Urban Renewal Associates LLC [Member]        
Commitments And Contingencies [Line Items]        
Number of units | item       372
XS Hotel Urban Renewal Associates LLC, Residence Inn [Member]        
Commitments And Contingencies [Line Items]        
Number of units | item       164
XS Hotel Urban Renewal Associates LLC, Marriott Envue [Member]        
Commitments And Contingencies [Line Items]        
Number of units | item       208
Portside 5/6 [Member]        
Commitments And Contingencies [Line Items]        
Number of units | item   296    
Chase III, Overlook Ridge [Member]        
Commitments And Contingencies [Line Items]        
Costs of the project incurred $ 64,300      
Delivery date to tenant the first quarter 2020      
Number of units | item 326      
Amount of project costs funded $ 38,700      
Building 8/9 [Member]        
Commitments And Contingencies [Line Items]        
Delivery date to tenant fourth quarter 2020      
Number of units | item 313      
Amount of project costs funded $ 50,900      
Total project costs 142,900      
The Upton At Short Hills [Member]        
Commitments And Contingencies [Line Items]        
Costs of the project incurred $ 50,400      
Delivery date to tenant fourth quarter 2020      
Number of units | item 198      
Amount outstanding $ 64,000      
Amount of project costs funded 35,400      
Total project costs 99,400      
25 Christopher Columbus [Member]        
Commitments And Contingencies [Line Items]        
Costs of the project incurred $ 151,900      
Delivery date to tenant first quarter 2022      
Number of units | item 750      
Amount outstanding $ 300,000      
Amount of project costs funded 122,500      
Total project costs 469,500      
Amount to fund 169,500      
Construction Loan [Member] | Chase III, Overlook Ridge [Member]        
Commitments And Contingencies [Line Items]        
Amount outstanding 62,000      
Total project costs 100,700      
Construction Loan [Member] | Building 8/9 [Member]        
Commitments And Contingencies [Line Items]        
Development costs 67,800      
Amount outstanding $ 92,000