Annual report pursuant to Section 13 and 15(d)

Recent Transactions (Schedule Of Properties Which Commenced Initial Operations) (Details)

v3.10.0.1
Recent Transactions (Schedule Of Properties Which Commenced Initial Operations) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
item
Real Estate Properties [Line Items]  
Number of Apartment Units | item 1,317
Total Development Costs Incurred $ 457,984
Unconsolidated Joint Venture Multi-Family Properties [Member]  
Real Estate Properties [Line Items]  
Number of Apartment Units | item 2,922
Unconsolidated Joint Venture Hotel [Member]  
Real Estate Properties [Line Items]  
Number of Apartment Units | item 350
145 Front At City Square [Member]  
Real Estate Properties [Line Items]  
Number of Apartment Units | item 365
Total Development Costs Incurred $ 97,483
Signature Place At Morris Plains [Member]  
Real Estate Properties [Line Items]  
Number of Apartment Units | item 197
Total Development Costs Incurred $ 56,715
Portside 5/6 [Member]  
Real Estate Properties [Line Items]  
Number of Apartment Units | item 296
Total Development Costs Incurred $ 114,694
Expected costs $ 700
Riverhouse 11 At Port Imperial [Member]  
Real Estate Properties [Line Items]  
Number of Apartment Units | item 295
Total Development Costs Incurred $ 130,369
Expected costs $ 1,200
Residence Inn By Marriott (Phase I) [Member]  
Real Estate Properties [Line Items]  
Number of Apartment Units | item 164
Total Development Costs Incurred $ 58,723
Land [Member] | 145 Front At City Square [Member]  
Real Estate Properties [Line Items]  
Total Development Costs Incurred 4,400
Land [Member] | Signature Place At Morris Plains [Member]  
Real Estate Properties [Line Items]  
Total Development Costs Incurred 900
Construction Loan [Member] | 145 Front At City Square [Member]  
Real Estate Properties [Line Items]  
Expected costs 1,100
Construction Loan [Member] | Residence Inn By Marriott (Phase I) [Member]  
Real Estate Properties [Line Items]  
Expected costs $ 20,100