Quarterly report pursuant to Section 13 or 15(d)

Investments In Unconsolidated Joint Ventures (Summary Of Company's Investment In Unconsolidated Joint Ventures) (Details)

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Investments In Unconsolidated Joint Ventures (Summary Of Company's Investment In Unconsolidated Joint Ventures) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2014
Marbella RoseGarden, L.L.C. [Member]
Dec. 31, 2013
Marbella RoseGarden, L.L.C. [Member]
Jun. 30, 2014
RoseGarden Monaco Holdings, L.L.C. [Member]
Dec. 31, 2013
RoseGarden Monaco Holdings, L.L.C. [Member]
Jun. 30, 2014
Rosewood Lafayette Holdings, L.L.C. [Member]
Dec. 31, 2013
Rosewood Lafayette Holdings, L.L.C. [Member]
Jun. 30, 2014
Rosewood Morristown, L.L.C. [Member]
Dec. 31, 2013
Rosewood Morristown, L.L.C. [Member]
Jun. 30, 2014
PruRose Riverwalk G, L.L.C. [Member]
Dec. 31, 2013
PruRose Riverwalk G, L.L.C. [Member]
Dec. 31, 2013
Elmajo Urban Renewal Associates, L.L.C. [Member]
Jun. 30, 2014
Crystal House Apartments Investors LLC [Member]
Dec. 31, 2013
Crystal House Apartments Investors LLC [Member]
Jun. 30, 2014
Portside Master Company, L.L.C. [Member]
Dec. 31, 2013
Portside Master Company, L.L.C. [Member]
Jun. 30, 2014
PruRose Port Imperial South 13, L.L.C. [Member]
Dec. 31, 2013
PruRose Port Imperial South 13, L.L.C. [Member]
Jun. 30, 2014
Roseland/Port Imperial Partners, L.P. [Member]
Dec. 31, 2013
Roseland/Port Imperial Partners, L.P. [Member]
Jun. 30, 2014
RoseGarden Marbella South, L.L.C. [Member]
Dec. 31, 2013
RoseGarden Marbella South, L.L.C. [Member]
Dec. 31, 2013
Estuary Urban Renewal Unit B, LLC [Member]
Jun. 30, 2014
RiverPark At Harrison I, L.L.C. [Member]
Dec. 31, 2013
RiverPark At Harrison I, L.L.C. [Member]
Jun. 30, 2014
Capitol Place Mezz LLC [Member]
Dec. 31, 2013
Capitol Place Mezz LLC [Member]
Jun. 30, 2014
Harborside Unit A Urban Renewal, LLC [Member]
May 21, 2014
Harborside Unit A Urban Renewal, LLC [Member]
Jun. 30, 2014
RoseGarden Monaco, L.L.C. [Member]
Dec. 31, 2013
RoseGarden Monaco, L.L.C. [Member]
Jun. 30, 2014
Grand Jersey Waterfront Urban Renewal Associates, L.L.C. [Member]
Dec. 31, 2013
Grand Jersey Waterfront Urban Renewal Associates, L.L.C. [Member]
Jun. 30, 2014
Red Bank Corporate Plaza, L.L.C. [Member]
Dec. 31, 2013
Red Bank Corporate Plaza, L.L.C. [Member]
Jun. 30, 2014
12 Vreeland Associates, L.L.C. [Member]
Dec. 31, 2013
12 Vreeland Associates, L.L.C. [Member]
Jun. 30, 2014
BNES Associates III [Member]
Dec. 31, 2013
BNES Associates III [Member]
Jun. 30, 2014
Hillsborough 206 Holdings, L.L.C. [Member]
Dec. 31, 2013
Hillsborough 206 Holdings, L.L.C. [Member]
Jun. 30, 2014
KPG-P 100 IMW JV, LLC [Member]
Dec. 31, 2013
KPG-P 100 IMW JV, LLC [Member]
Jun. 30, 2014
KPG-MCG Curtis JV, LLC [Member]
Jun. 30, 2014
Curtis Center TIC I And II LLC [Member]
Jun. 30, 2014
Plaza VIII & IX Associates, L.L.C. [Member]
Dec. 31, 2013
Plaza VIII & IX Associates, L.L.C. [Member]
Jun. 30, 2014
Roseland/North Retail, L.L.C. [Member]
Dec. 31, 2013
Roseland/North Retail, L.L.C. [Member]
Jun. 30, 2014
South Pier At Harborside [Member]
Dec. 31, 2013
South Pier At Harborside [Member]
Jun. 30, 2014
Stamford SM LLC [Member]
Dec. 31, 2013
Stamford SM LLC [Member]
Jun. 30, 2014
Other [Member]
Dec. 31, 2013
Other [Member]
Schedule of Equity Method Investments [Line Items]                                                                                                                
Company's investments in unconsolidated joint ventures, net $ 265,866 $ 181,129 $ 15,782 [1] $ 15,797 $ 2,686 [1] $ 3,201 $ 496 [1] $ 857 $ 6,257 [2],[3] $ 6,455 $ 1,950 [1] $ 3,117 $ 203 $ 26,458 [4] $ 26,838 $ 2,655 [1] $ 3,207 $ 1,685 [1] $ 2,206 $ 1,926 [1],[5] $ 2,068 $ 8,580 [1] $ 7,567 $ 24 $ 4,247 $ 3,655 $ 47,978 $ 46,628 $ 22,150 [6] $ 30,600 $ 1,255 $ 1,224 $ 337 $ 337 $ 3,771 $ 4,046 $ 5,658 $ 5,514 $ 1,899 $ 1,753 $ 1,962 $ 1,962 $ 751 $ 1,887 $ 2,187 [6] $ 61,296 [7] $ 3,848 [8] $ 3,702 $ 1,883 [9] $ 1,930    [10]    [10] $ 37,418 [8] $ 36,258 $ 751 [9] $ 693
Accounts payable, accrued expenses and other liabilities $ 140,546 $ 121,286                                                                                                 $ 710 $ 1,706        
[1] 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.
[2] Through the joint venture, the Company also owns a 12.5 percent interest in a 50,973 square feet of 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").
[3] The Company's ownership interests in this venture are subordinate to its partner's preferred capital balance and the payment of the outstanding balance remaining on a note ($975 as of June 30, 2014), and is not expected to meaningfully participate in the venture's cash flows in the near term.
[4] 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.
[5] The Company also owns a 20 percent residual interest in undeveloped land parcels: parcels 6, I, and J ("Port Imperial North Land") that can accommodate the development of 836 apartment units.
[6] See discussion in Recent Transactions following in this footnote.
[7] Includes undivided interests in the same manner as investments in noncontrolled partnership, pursuant to ASC 970-323-25-12. See discussion in Recent Transactions following in this footnote.
[8] The joint venture owns a senior mezzanine loan ("Mezz Loan") with a face value of $50,000 and is secured by the equity interests in a seven-building portfolio containing 1.67 million square feet of Class A office space and 106 residential rental units totaling 70,500 square feet. The interest-only Mezz Loan has a carrying value of $46,505 and is subject to an agreement that provides, subject to certain conditions, for the payment of principal proceeds above $47,000 to another party. The Mezz loan bears interest at LIBOR plus 325 basis points and matures in August 2014. The joint venture is evaluating its option regarding its investment as the loan approaches maturity.
[9] 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.
[10] The negative investment balance for this joint venture of $710 and $1,706 as of June 30, 2014 and December 31, 2013, respectively, were included in accounts payable, accrued expenses and other liabilities.