Investments In Unconsolidated Joint Ventures (Summary Of Unconsolidated Joint Ventures) (Details)

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Investments In Unconsolidated Joint Ventures (Summary Of Unconsolidated Joint Ventures) (Details) $ in Thousands										1 Months Ended	6 Months Ended	12 Months Ended
		Dec. 07, 2017	Sep. 29, 2017 USD ($)	Sep. 21, 2017 USD ($)	Mar. 31, 2017 USD ($)	Feb. 15, 2017 USD ($)	Feb. 03, 2017 USD ($) item	Apr. 01, 2016 USD ($)	Feb. 03, 2007	Oct. 31, 2016	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($) ft² item	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Feb. 28, 2017 shares	Feb. 02, 2017	May 26, 2016 item
Schedule of Equity Method Investments [Line Items]
Carrying Amount												$ 252,626	$ 320,047
Property Debt, Balance												45,734
Cash consideration											$ 2,000
Accounts payable, accrued expenses and other liabilities												192,716	159,874
Mortgage loan face amount												44,695
Purchase price of property												90,068	121,582	$ 94,073
Proceeds from the sale of investments in unconsolidated joint ventures												110,269	6,420	6,448
Debt												2,809,568
Gain (loss) on sale of investment in unconsolidated joint venture												$ 23,131	5,670	$ 6,448
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%
RoseGarden Monaco Holdings, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Company's Effective Ownership %															13.80%
Gain (loss) on sale of investment in unconsolidated joint venture				$ (1,400)
PruRose Riverwalk G, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Number of units | item												316
Purchase price of property								$ 11,300
Percent of pari passu interest										22.50%
Crystal House Apartments Investors LLC [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
Riverwalk C Urban Renewal, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Subordinate interest		20.00%
Percent of pari passu interest		40.00%
RoseGarden Marbella South, L.L.C. [Member] | Construction Loan [Member]
Schedule of Equity Method Investments [Line Items]
Number of extension options | item												2
Loan extension period					1 year							1 year
Extension fee												0.25%
Maximum borrowing capacity					$ 75,000							$ 77,400
Harborside Unit A Urban Renewal, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Company's Effective Ownership %												85.00%
Harborside Unit A Urban Renewal, LLC [Member] | Construction/Permanent Loan [Member]
Schedule of Equity Method Investments [Line Items]
Maximum borrowing capacity												$ 192,000
RoseGarden Monaco, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Gain (loss) on sale of investment in unconsolidated joint venture				$ (1,400)
Plaza VIII & IX Associates, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Company's Effective Ownership %																50.00%
PruRose Port Imperial South 15, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Number of units | item																	236
Percentage of interest in venture																	50.00%
PruRose Port Imperial South 13, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of interest in venture																	20.00%
KPG-MCG Curtis JV, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Proceeds from the sale of investments in unconsolidated joint ventures			$ 102,500
Debt			75,000
Gain (loss) on sale of investment in unconsolidated joint venture			$ 12,000
The Shops At 40 Park Property [Member] | Rosewood Morristown, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Rentable Square Feet (sf) | ft²												50,973
Property Debt, Balance												$ 6,200
Property Debt, Maturity Date												Aug. 01, 2018
Property Debt, Interest Rate												3.63%
Residual ownership interest												12.50%
Lofts At 40 Park Property [Member] | Rosewood Morristown, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Number of units | item												59
Property Debt, Balance							$ 10,200
Indirect ownership interest												25.00%
Number of stories | item												5
Lofts At 40 Park Property [Member] | Rosewood Morristown, L.L.C. [Member] | Construction Loan [Member]
Schedule of Equity Method Investments [Line Items]
Property Debt, Maturity Date							Feb. 01, 2020
Property Debt, Interest Rate, Spread Over LIBOR							2.50%
Number of extension options | item							2
Loan extension period									1 year
Extension fee									0.15%
Metropolitan Property [Member] | RoseGarden Monaco Holdings, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Preferred units shares issued | shares															9,122
Metropolitan Property [Member] | Rosewood Morristown, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Property Debt, Balance												$ 36,800
Property Debt, Maturity Date												Sep. 01, 2020
Property Debt, Interest Rate												3.25%
Port Imperial North Land [Member] | Roseland/Port Imperial Partners, L.P. [Member]
Schedule of Equity Method Investments [Line Items]
Number of units | item												836
Residual ownership interest												20.00%
Unconsolidated Joint Venture Multi-Family Properties [Member]
Schedule of Equity Method Investments [Line Items]
Number of units | item												3,275
Unconsolidated Joint Venture Multi-Family Properties [Member] | Marbella RoseGarden, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Number of units | item												412
Company's Effective Ownership %	[1]											24.27%
Carrying Amount												$ 14,544	15,150
Property Debt, Balance												$ 95,000
Property Debt, Maturity Date												May 01, 2018
Property Debt, Interest Rate												4.99%
Unconsolidated Joint Venture Multi-Family Properties [Member] | RoseGarden Monaco Holdings, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Number of units | item	[2]											523
Unconsolidated Joint Venture Multi-Family Properties [Member] | Rosewood Morristown, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Number of units | item	[3],[4]											130
Company's Effective Ownership %	[1],[3],[4]											12.50%
Carrying Amount	[3],[4]											$ 6,834	7,145
Property Debt, Balance	[3],[4],[5]											$ 53,224
Unconsolidated Joint Venture Multi-Family Properties [Member] | Riverwalk G Urban Renewal, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Number of units | item												316
Company's Effective Ownership %	[1]											22.50%
Carrying Amount												$ 8,864	9,707
Property Debt, Balance												$ 82,000
Property Debt, Maturity Date												Nov. 10, 2026
Property Debt, Interest Rate												3.21%
Unconsolidated Joint Venture Multi-Family Properties [Member] | Elmajo Urban Renewal Associates, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Number of units | item	[6]											355
Company's Effective Ownership %	[1],[6]											7.50%
Gain (loss) on sale of investment in unconsolidated joint venture						$ 5,100
Unconsolidated Joint Venture Multi-Family Properties [Member] | Crystal House Apartments Investors LLC [Member]
Schedule of Equity Method Investments [Line Items]
Number of units | item	[7]											825
Company's Effective Ownership %	[1],[7]											25.00%
Carrying Amount	[7]											$ 30,570	30,565
Property Debt, Balance	[7]											$ 165,000
Property Debt, Maturity Date	[7]											Apr. 01, 2020
Property Debt, Interest Rate	[7]											3.17%
Unconsolidated Joint Venture Multi-Family Properties [Member] | Riverwalk C Urban Renewal, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Number of units | item	[8]											360
Company's Effective Ownership %	[1],[8]											40.00%
Carrying Amount	[8]											$ 16,844
Property Debt, Maturity Date	[8]											Dec. 06, 2021
Property Debt, Interest Rate, LIBOR	[8]											L+2.75
Property Debt, Interest Rate, Spread Over LIBOR												2.75%
Unconsolidated Joint Venture Multi-Family Properties [Member] | RoseGarden Marbella South, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Number of units | item												311
Company's Effective Ownership %	[1]											24.27%
Carrying Amount												$ 16,471	18,050
Property Debt, Balance												$ 74,690
Property Debt, Maturity Date												Mar. 30, 2018
Property Debt, Interest Rate, LIBOR	[9]											L+2.25
Property Debt, Interest Rate, Spread Over LIBOR	[9]											2.25%
Unconsolidated Joint Venture Multi-Family Properties [Member] | Estuary Urban Renewal Unit B, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Number of units | item												227
Company's Effective Ownership %	[1]											7.50%
Unconsolidated Joint Venture Multi-Family Properties [Member] | Riverpark At Harrison I, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Number of units | item												141
Company's Effective Ownership %	[1]											45.00%
Carrying Amount												$ 1,604	2,085
Property Debt, Balance												$ 30,000
Property Debt, Maturity Date												Aug. 01, 2025
Property Debt, Interest Rate												3.70%
Unconsolidated Joint Venture Multi-Family Properties [Member] | Capitol Place Mezz LLC [Member]
Schedule of Equity Method Investments [Line Items]
Number of units | item												378
Company's Effective Ownership %	[1]											50.00%
Carrying Amount												$ 40,124	43,073
Property Debt, Balance												$ 100,070
Property Debt, Maturity Date												Jul. 01, 2033
Property Debt, Interest Rate												4.82%
Unconsolidated Joint Venture Multi-Family Properties [Member] | Harborside Unit A Urban Renewal, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Number of units | item												762
Company's Effective Ownership %	[1]											85.00%
Carrying Amount												$ 94,429	100,188
Property Debt, Balance												$ 189,853
Property Debt, Maturity Date												Aug. 01, 2029
Property Debt, Interest Rate	[10]											5.197%
Unconsolidated Joint Venture Multi-Family Properties [Member] | Roseland/Port Imperial Partners, L.P. [Member]
Schedule of Equity Method Investments [Line Items]
Number of units | item	[11]											836
Company's Effective Ownership %	[1],[11]											20.00%
Carrying Amount	[11]											$ 1,678	1,678
Unconsolidated Joint Venture Multi-Family Properties [Member] | RoseGarden Monaco, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Number of units | item	[12]											250
Company's Effective Ownership %	[1],[12]											41.67%
Carrying Amount	[12]												1,400
Unconsolidated Joint Venture Multi-Family Properties [Member] | Grand Jersey Waterfront URA, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Number of units | item												850
Company's Effective Ownership %	[1]											50.00%
Carrying Amount												$ 337	337
Unconsolidated Joint Venture Multi-Family Properties [Member] | Hillsborough 206 Holdings, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Rentable Square Feet (sf) | ft²												160,000
Company's Effective Ownership %	[1]											50.00%
Carrying Amount												$ 1,962	1,962
Unconsolidated Joint Venture Multi-Family Properties [Member] | Plaza VIII & IX Associates, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Rentable Square Feet (sf) | ft²	[13]											1,225,000
Company's Effective Ownership %	[1],[13]											50.00%
Carrying Amount	[13]												4,448
Unconsolidated Joint Venture Multi-Family Properties [Member] | Elmajo Urban Renewal Associates, LLC And Estuary Urban Renewal Associates, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Company's Effective Ownership %						7.50%
Percentage of interest in venture						7.50%
Proceeds from the sale of investments in unconsolidated joint ventures						$ 5,100
Gain (loss) on sale of investment in unconsolidated joint venture						$ 5,100
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 Corporate Plaza, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Rentable Square Feet (sf) | ft²												92,878
Company's Effective Ownership %	[1]											50.00%
Carrying Amount												$ 4,602	4,339
Property Debt, Balance												$ 13,876
Property Debt, Maturity Date												May 17, 2018
Property Debt, Interest Rate, LIBOR												L+3.00
Property Debt, Interest Rate, Spread Over LIBOR												3.00%
Unconsolidated Joint Venture Office Buildings [Member] | 12 Vreeland Associates, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Rentable Square Feet (sf) | ft²												139,750
Company's Effective Ownership %	[1]											50.00%
Carrying Amount												$ 6,734	6,237
Property Debt, Balance												$ 9,495
Property Debt, Maturity Date												Jul. 01, 2023
Property Debt, Interest Rate												2.87%
Unconsolidated Joint Venture Office Buildings [Member] | BNES Associates III [Member]
Schedule of Equity Method Investments [Line Items]
Rentable Square Feet (sf) | ft²												106,345
Company's Effective Ownership %	[1]											31.25%
Carrying Amount												$ 3,369	3,124
Property Debt, Balance												$ 4,794
Property Debt, Maturity Date												Nov. 01, 2023
Property Debt, Interest Rate												4.76%
Unconsolidated Joint Venture Office Buildings [Member] | KPG-P 100 IMW JV, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Rentable Square Feet (sf) | ft²	[14]											339,615
Property Debt, Interest Rate, LIBOR												-
Unconsolidated Joint Venture Office Buildings [Member] | Keystone-Penn [Member]
Schedule of Equity Method Investments [Line Items]
Rentable Square Feet (sf) | ft²	[14]											1,842,820
Company's Effective Ownership %	[1]
Unconsolidated Joint Venture Office Buildings [Member] | Keystone-TriState [Member]
Schedule of Equity Method Investments [Line Items]
Rentable Square Feet (sf) | ft²	[14]											1,266,384
Company's Effective Ownership %	[1]
Carrying Amount													2,285
Unconsolidated Joint Venture Office Buildings [Member] | KPG-MCG Curtis JV, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Rentable Square Feet (sf) | ft²	[15]											885,000
Carrying Amount													65,400
Unconsolidated Joint Venture Other Property [Member]
Schedule of Equity Method Investments [Line Items]
Carrying Amount												$ 252,626	320,047
Property Debt, Balance												$ 917,137
Unconsolidated Joint Venture Other Property [Member] | Roseland/North Retail, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Rentable Square Feet (sf) | ft²												30,745
Company's Effective Ownership %	[1]											20.00%
Carrying Amount												$ 1,625	1,706
Unconsolidated Joint Venture Other Property [Member] | South Pier At Harborside [Member]
Schedule of Equity Method Investments [Line Items]
Number of units | item												350
Company's Effective Ownership %	[1]											50.00%
Carrying Amount												$ 440	163
Property Debt, Balance												$ 99,135
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 Amount	[16]											$ 1,595	$ 1,005
[1] Company's effective ownership % represents the Company's entitlement to residual distributions after payments of priority returns, where applicable. [2] On February 28, 2017, 9,122 Series A-1 Units were issued to the joint venture partner as noncash consideration for the partner's approximate 13.8 percent ownership interest in the joint venture. In April 2017, the Company acquired the remaining joint venture interests and increased its ownership interest to 100 percent. See Note 3: Recent Transactions - Consolidation. [3] The Company's ownership interests in this venture are subordinate to its partner's preferred capital balance and the Company is not expected to meaningfully participate in the venture's cash flows in the near term. [4] Through the joint venture, the Company also owns a 12.5 percent interest in a 50,973 square feet retail building ("Shops at 40 Park") and a 25 percent interest in a to-be-built 59-unit, five story multi-family rental development property ("Lofts at 40 Park"). [5] Property debt balance consists of: (i) an amortizable loan, collateralized by the Metropolitan at 40 Park, with a balance of $36.8 million bears interest at 3.25 percent, matures in September 2020; (ii) an amortizable loan, collateralized by the Shops at 40 Park, with a balance of $6.2 million, bears interest at 3.63 percent, matures in August 2018. On February 3, 2017, the venture obtained a construction loan for the Lofts at 40 Park with a balance of $10. 2 million, which bears interest at LIBOR plus 250 basis points and matures in February 2020 and provides, subject to certain conditions, two one-year extension options with a fee of 15 basis points for each year. [6] On February 15, 2017, the Company sold its 7.5 percent interest in Elmajo Urban Renewal Associates, LLC and Estuary Urban Renewal Unit B, LLC joint ventures that own operating multi-family properties, located in Weehawken, New Jersey for a combined sales price of $5.1 million. [7] The Company also owns a 50 percent interest in a vacant land to accommodate the development of approximately 295 additional units of which 252 are currently approved. [8] On December 7, 2017, simultaneous with the financing of the construction loan, the Company converted its 20 percent subordinate interest to 40 percent pari-passu interest. [9] The construction loan had a maximum borrowing amount of $77.4 million and provided, subject to certain conditions, two one-year extension options with a fee of 25 basis points for each year. On March 31, 2017, the Company exercised its first one-year extension option and concurrently the maximum borrowing amount was reduced to $75 million. [10] The construction/permanent loan has a maximum borrowing amount of $192 million. The Company owns an 85 percent interest with shared control over major decisions such as, approval of budgets, property financings and leasing guidelines. The development project was placed in service in second quarter 2017. [11] The Company also owns a 20 percent residual interest in undeveloped land parcels: parcels 6, I, and J that can accommodate the development of 836 apartment units. [12] On September 21, 2017, the joint venture agreement was terminated. Accordingly, the Company wrote off the carrying value of its investment in the joint venture and recorded a loss of $1.4 million on the disposition of its joint venture interest. [13] On February 3, 2017, the Company acquired the equity interest of its partner. See Note 3: Recent Transactions - Consolidation. [14] On January 31, 2017, the Company sold its equity interest in the joint venture. See Note 3: Recent Transactions - Unconsolidated Joint Venture Activity. [15] Includes undivided interests in the same manner as investments in noncontrolling partnership, pursuant to ASC 970-323-25-12. On September 29, 2017, the Company sold its equity interest to its joint venture partner, which included the retirement of the Company's share in the debt of $75 million. See Note 3: Recent Transactions - Unconsolidated Joint Venture Activity. [16] The Company owns other interests in various unconsolidated joint ventures, including interests in assets previously owned and interest in ventures whose businesses are related to its core operations. These ventures are not expected to significantly impact the Company's operations in the near term.