Investments In Unconsolidated Joint Ventures (Summary Of Unconsolidated Joint Ventures) (Details) $ in Thousands				9 Months Ended
	Aug. 02, 2018 USD ($) item	Aug. 01, 2018 USD ($) item	Mar. 30, 2018 USD ($) item	Sep. 30, 2018 USD ($) ft² item	Dec. 31, 2017 USD ($)
Schedule of Equity Method Investments [Line Items]
Number of units | item				1,153
Carrying Value				$ 230,614	$ 252,626
Minimum [Member]
Schedule of Equity Method Investments [Line Items]
Company's Effective Ownership %				12.50%
Maximum [Member]
Schedule of Equity Method Investments [Line Items]
Company's Effective Ownership %				85.00%
Marbella Tower Urban Renewal Associates LLC [Member]
Schedule of Equity Method Investments [Line Items]
Number of units | item	412
Company's Effective Ownership %	24.27%	24.27%
Mortgage loan	$ 131,000	$ 95,000
Property Debt, Maturity Date				Aug. 01, 2026
Property Debt, Interest Rate, Spread Over LIBOR	4.07%
Percentage of additional interest acquired	50.00%
Crystal House [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of interest in developable land				50.00%
Number of units available for development | item				295
Number of approved units available for development | item				252
PI North - Riverwalk C [Member] | Construction Loan [Member]
Schedule of Equity Method Investments [Line Items]
Maximum borrowing capacity				$ 112,000
Marbella II [Member] | Construction Loan [Member]
Schedule of Equity Method Investments [Line Items]
Number of extension options | item			4
Loan extension period			3 months
Extension fee			0.0625%
Maximum borrowing capacity			$ 75,000
Urby At Harborside [Member] | Construction/Permanent Loan [Member]
Schedule of Equity Method Investments [Line Items]
Company's Effective Ownership %				85.00%
Maximum borrowing capacity				$ 192,000
PI North - Land [Member]
Schedule of Equity Method Investments [Line Items]
Number of units | item				836
Residual ownership interest				20.00%
Red Bank [Member]
Schedule of Equity Method Investments [Line Items]
Property Debt, Maturity Date				Aug. 01, 2023
Property Debt, Interest Rate, Spread Over LIBOR				2.25%
Number of extension options | item		2
Maximum borrowing capacity		$ 16,500
The Shops At 40 Park Property [Member] | Metropolitan At 40 Park [Member]
Schedule of Equity Method Investments [Line Items]
Rentable Square Feet (sf) | ft²				50,973
Mortgage loan				$ 6,067
Property Debt, Maturity Date				Sep. 01, 2019
Property Debt, Interest Rate, Spread Over LIBOR				2.25%
Residual ownership interest				12.50%
Lofts At 40 Park Property [Member] | Metropolitan At 40 Park [Member]
Schedule of Equity Method Investments [Line Items]
Number of units | item				59
Indirect ownership interest				25.00%
Number of stories | item				5
Lofts At 40 Park Property [Member] | Metropolitan At 40 Park [Member] | Construction Loan [Member]
Schedule of Equity Method Investments [Line Items]
Mortgage loan				$ 13,145
Property Debt, Maturity Date				Feb. 01, 2020
Property Debt, Interest Rate, Spread Over LIBOR				2.50%
Maximum borrowing capacity				$ 13,950
Metropolitan Property [Member] | Metropolitan At 40 Park [Member]
Schedule of Equity Method Investments [Line Items]
Mortgage loan				$ 36,224
Property Debt, Maturity Date				Sep. 01, 2020
Property Debt, Interest Rate				3.25%
Unconsolidated Joint Venture Multi-Family Properties [Member]
Schedule of Equity Method Investments [Line Items]
Number of units | item				2,922
Unconsolidated Joint Venture Multi-Family Properties [Member] | Marbella [Member]
Schedule of Equity Method Investments [Line Items]
Number of units | item				412
Company's Effective Ownership %				24.27%
Carrying Value					14,544
Property Debt, Interest Rate, LIBOR				-
Unconsolidated Joint Venture Multi-Family Properties [Member] | Metropolitan At 40 Park [Member]
Schedule of Equity Method Investments [Line Items]
Number of units | item				189
Company's Effective Ownership %				12.50%
Carrying Value				$ 6,472	6,834
Mortgage loan				$ 55,436
Property Debt, Interest Rate
Unconsolidated Joint Venture Multi-Family Properties [Member] | RiverTrace At Port Imperial [Member]
Schedule of Equity Method Investments [Line Items]
Number of units | item				316
Company's Effective Ownership %				22.50%
Carrying Value				$ 8,311	8,864
Mortgage loan				$ 82,000
Property Debt, Maturity Date				Nov. 10, 2026
Property Debt, Interest Rate				3.21%
Unconsolidated Joint Venture Multi-Family Properties [Member] | Crystal House [Member]
Schedule of Equity Method Investments [Line Items]
Number of units | item				825
Company's Effective Ownership %				25.00%
Carrying Value				$ 29,252	30,570
Mortgage loan				$ 163,661
Property Debt, Maturity Date				Apr. 01, 2020
Property Debt, Interest Rate				3.17%
Unconsolidated Joint Venture Multi-Family Properties [Member] | PI North - Riverwalk C [Member]
Schedule of Equity Method Investments [Line Items]
Number of units | item				360
Company's Effective Ownership %				40.00%
Carrying Value				$ 23,342	16,844
Property Debt, Maturity Date				Dec. 06, 2021
Property Debt, Interest Rate, LIBOR				L+2.75
Property Debt, Interest Rate, Spread Over LIBOR				2.75%
Unconsolidated Joint Venture Multi-Family Properties [Member] | Marbella II [Member]
Schedule of Equity Method Investments [Line Items]
Number of units | item				311
Company's Effective Ownership %				24.27%
Carrying Value				$ 15,705	16,471
Mortgage loan				$ 74,690
Property Debt, Maturity Date				Mar. 30, 2019
Property Debt, Interest Rate, LIBOR				L+2.25
Property Debt, Interest Rate, Spread Over LIBOR				2.25%
Unconsolidated Joint Venture Multi-Family Properties [Member] | Riverpark At Harrison [Member]
Schedule of Equity Method Investments [Line Items]
Number of units | item				141
Company's Effective Ownership %				45.00%
Carrying Value				$ 1,343	1,604
Mortgage loan				$ 29,957
Property Debt, Maturity Date				Aug. 01, 2025
Property Debt, Interest Rate				3.70%
Unconsolidated Joint Venture Multi-Family Properties [Member] | Station House [Member]
Schedule of Equity Method Investments [Line Items]
Number of units | item				378
Company's Effective Ownership %				50.00%
Carrying Value				$ 38,329	40,124
Mortgage loan				$ 98,902
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 units | item				762
Company's Effective Ownership %				85.00%
Carrying Value				$ 87,723	94,429
Mortgage loan				$ 191,732
Property Debt, Maturity Date				Aug. 01, 2029
Property Debt, Interest Rate				5.197%
Unconsolidated Joint Venture Multi-Family Properties [Member] | PI North - Land [Member]
Schedule of Equity Method Investments [Line Items]
Number of units | item				836
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 units | item				850
Company's Effective Ownership %				50.00%
Carrying Value				$ 337	337
Unconsolidated Joint Venture Multi-Family Properties [Member] | Hillsborough 206 [Member]
Schedule of Equity Method Investments [Line Items]
Rentable Square Feet (sf) | ft²				160,000
Company's Effective Ownership %				50.00%
Carrying Value				$ 1,962	1,962
Unconsolidated Joint Venture Office Buildings [Member]
Schedule of Equity Method Investments [Line Items]
Rentable Square Feet (sf) | ft²				500,000
Unconsolidated Joint Venture Office Buildings [Member] | Red Bank [Member]
Schedule of Equity Method Investments [Line Items]
Rentable Square Feet (sf) | ft²				92,878
Company's Effective Ownership %				50.00%
Carrying Value				$ 3,148	4,602
Mortgage loan				$ 14,000
Property Debt, Maturity Date				Aug. 01, 2023
Property Debt, Interest Rate, LIBOR				L+2.25
Property Debt, Interest Rate, Spread Over LIBOR				2.25%
Unconsolidated Joint Venture Office Buildings [Member] | 12 Vreeland Road [Member]
Schedule of Equity Method Investments [Line Items]
Rentable Square Feet (sf) | ft²				139,750
Company's Effective Ownership %				50.00%
Carrying Value				$ 6,891	6,734
Mortgage loan				$ 8,306
Property Debt, Maturity Date				Jul. 01, 2023
Property Debt, Interest Rate				2.87%
Unconsolidated Joint Venture Office Buildings [Member] | Offices At Crystal Lake [Member]
Schedule of Equity Method Investments [Line Items]
Rentable Square Feet (sf) | ft²				106,345
Company's Effective Ownership %				31.25%
Carrying Value				$ 3,425	3,369
Mortgage loan				$ 4,258
Property Debt, Maturity Date				Nov. 01, 2023
Property Debt, Interest Rate				4.76%
Unconsolidated Joint Venture Other Property [Member]
Schedule of Equity Method Investments [Line Items]
Carrying Value				$ 230,614	252,626
Mortgage loan				$ 822,942
Unconsolidated Joint Venture Other Property [Member] | Riverwalk Retail [Member]
Schedule of Equity Method Investments [Line Items]
Rentable Square Feet (sf) | ft²				30,745
Company's Effective Ownership %				20.00%
Carrying Value				$ 1,560	1,625
Unconsolidated Joint Venture Other Property [Member] | Hyatt Regency Jersey City [Member]
Schedule of Equity Method Investments [Line Items]
Number of units | item				351
Company's Effective Ownership %				50.00%
Carrying Value					440
Mortgage loan				$ 100,000
Property Debt, Maturity Date				Oct. 01, 2026
Property Debt, Interest Rate				3.668%
Unconsolidated Joint Venture Other Property [Member] | Other [Member]
Schedule of Equity Method Investments [Line Items]
Carrying Value				$ 1,136	$ 1,595