Investments In Unconsolidated Joint Ventures (Summary Of Unconsolidated Joint Ventures) (Details) $ in Thousands		3 Months Ended
	Sep. 01, 2021 USD ($)	Mar. 31, 2022 USD ($) ft² item	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)
Schedule of Equity Method Investments [Line Items]
Carrying Value		$ 135,116		$ 137,772
Purchase price of property		$ 8,163	$ 16,978
PI North - Land [Member]
Schedule of Equity Method Investments [Line Items]
Number of Apartment Units | item		771
Residual ownership interest		20.00%
The Shops At 40 Park Property [Member] | Metropolitan And Lofts At 40 Park [Member]
Schedule of Equity Method Investments [Line Items]
Rentable Square Feet (sf) | ft²		50,973
Residual ownership interest		25.00%
Lofts At 40 Park Property [Member] | Debt Maturity C [Member]
Schedule of Equity Method Investments [Line Items]
Balance		$ 6,067
Property Debt, Interest Rate, Spread Over LIBOR		1.50%
Lofts At 40 Park Property [Member] | Debt Maturity D [Member]
Schedule of Equity Method Investments [Line Items]
Balance		$ 18,200
Property Debt, Interest Rate, Spread Over LIBOR		1.50%
Lofts At 40 Park Property [Member] | Metropolitan And Lofts At 40 Park [Member]
Schedule of Equity Method Investments [Line Items]
Number of Apartment Units | item		59
Indirect ownership interest		50.00%
Number of stories | item		5
Metropolitan Property [Member] | Debt Maturity B [Member]
Schedule of Equity Method Investments [Line Items]
Balance		$ 36,500
Property Debt, Interest Rate, Spread Over LIBOR		2.85%
Unconsolidated Joint Venture Multi-Family Properties [Member]
Schedule of Equity Method Investments [Line Items]
Number of Apartment Units | item		2,146
Unconsolidated Joint Venture Multi-Family Properties [Member] | Metropolitan And Lofts At 40 Park [Member]
Schedule of Equity Method Investments [Line Items]
Number of Apartment Units | item		189
Company's Effective Ownership %		25.00%
Carrying Value		$ 2,282		2,547
Balance		$ 60,767
Unconsolidated Joint Venture Multi-Family Properties [Member] | RiverTrace At Port Imperial [Member]
Schedule of Equity Method Investments [Line Items]
Number of Apartment Units | item		316
Company's Effective Ownership %		22.50%
Carrying Value		$ 5,894		6,077
Balance		$ 82,000
Property Debt, Maturity Date		Nov. 10, 2026
Property Debt, Interest Rate		3.21%
Unconsolidated Joint Venture Multi-Family Properties [Member] | PI North - Riverwalk C [Member]
Schedule of Equity Method Investments [Line Items]
Number of Apartment Units | item		360
Company's Effective Ownership %		40.00%
Carrying Value		$ 26,596		27,401
Balance		$ 135,000
Property Debt, Maturity Date		Dec. 22, 2024
Property Debt, Interest Rate		1.20%
Unconsolidated Joint Venture Multi-Family Properties [Member] | PI North - Riverwalk C [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Schedule of Equity Method Investments [Line Items]
Property Debt, Interest Rate, Spread Over LIBOR		1.20%
Unconsolidated Joint Venture Multi-Family Properties [Member] | Riverpark At Harrison [Member]
Schedule of Equity Method Investments [Line Items]
Number of Apartment Units | item		141
Company's Effective Ownership %		45.00%
Balance		$ 30,192
Property Debt, Maturity Date		Jul. 01, 2035
Property Debt, Interest Rate		3.19%
Unconsolidated Joint Venture Multi-Family Properties [Member] | Station House [Member]
Schedule of Equity Method Investments [Line Items]
Number of Apartment Units | item		378
Company's Effective Ownership %		50.00%
Carrying Value		$ 32,646		33,004
Balance		$ 92,863
Property Debt, Maturity Date		Jul. 01, 2033
Property Debt, Interest Rate		4.82%
Unconsolidated Joint Venture Multi-Family Properties [Member] | Urby At Harborside [Member]
Schedule of Equity Method Investments [Line Items]
Number of Apartment Units | item		762
Company's Effective Ownership %		85.00%
Carrying Value		$ 65,373		66,418
Balance		$ 190,480
Property Debt, Maturity Date		Aug. 01, 2029
Property Debt, Interest Rate		5.197%
Guaranteed amount		$ 22,000
Unconsolidated Joint Venture Multi-Family Properties [Member] | PI North - Land [Member]
Schedule of Equity Method Investments [Line Items]
Number of Apartment Units | item		771
Company's Effective Ownership %		20.00%
Carrying Value		$ 1,678		1,678
Unconsolidated Joint Venture Multi-Family Properties [Member] | Liberty Landing [Member]
Schedule of Equity Method Investments [Line Items]
Number of Apartment Units | item		850
Company's Effective Ownership %		50.00%
Carrying Value		$ 300		300
Unconsolidated Joint Venture Office Buildings [Member] | Offices At Crystal Lake [Member]
Schedule of Equity Method Investments [Line Items]
Sale price	$ 1,900
Unconsolidated Joint Venture Office Buildings [Member] | Hyatt Regency Hotel Jersey City [Member]
Schedule of Equity Method Investments [Line Items]
Number of Apartment Units | item		351
Company's Effective Ownership %		50.00%
Balance		$ 100,000
Property Debt, Maturity Date		Oct. 01, 2026
Property Debt, Interest Rate		3.668%
Unconsolidated Joint Venture Other Property [Member]
Schedule of Equity Method Investments [Line Items]
Carrying Value		$ 135,116		137,772
Balance		691,302
Unconsolidated Joint Venture Other Property [Member] | Other [Member]
Schedule of Equity Method Investments [Line Items]
Carrying Value		$ 347		$ 347