Annual report pursuant to Section 13 and 15(d)

Mortgages, Loans Payable And Other Obligations (Summary Of Mortgages, Loans Payable And Other Obligations) (Details)

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Mortgages, Loans Payable And Other Obligations (Summary Of Mortgages, Loans Payable And Other Obligations) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Jun. 30, 2012
Dec. 31, 2012
Dec. 31, 2010
Dec. 31, 2011
Mortgages Loans Payable And Other Obligations [Line Items]          
Mortgages, loans payable and other obligations $ 757,495   $ 757,495   $ 739,448
Loss from early extinguishment of debt (545) (4,415) (4,960) (3,752)  
2200 Renaissance Boulevard [Member]
          
Mortgages Loans Payable And Other Obligations [Line Items]          
Property Name     2200 Renaissance Boulevard (b) [1]    
Lender     Wachovia CMBS [1]    
Effective Rate 5.888% [1],[2]   5.888% [1],[2]    
Mortgages, loans payable and other obligations         16,171 [1]
Soundview Plaza [Member]
          
Mortgages Loans Payable And Other Obligations [Line Items]          
Property Name     Soundview Plaza (c) [3]    
Lender     Morgan Stanley Mortgage Capital [3]    
Effective Rate 6.015% [2],[3]   6.015% [2],[3]    
Mortgages, loans payable and other obligations         15,531 [3]
One Grande Commons [Member]
          
Mortgages Loans Payable And Other Obligations [Line Items]          
Property Name     One Grande Commons (d) [4]    
Lender     Capital One Bank [4]    
LIBOR     LIBOR+2.00 [2],[4]    
Spread over LIBOR 0.02% [2],[4]   0.02% [2],[4]    
Mortgages, loans payable and other obligations         11,000 [4]
581 Main Street [Member]
          
Mortgages Loans Payable And Other Obligations [Line Items]          
Property Name     581 Main Street (e) [5]    
Lender     Valley National Bank [5]    
Effective Rate 6.935% [2],[5]   6.935% [2],[5]    
Mortgages, loans payable and other obligations         16,338 [5]
Loss from early extinguishment of debt     500    
Port Imperial South [Member]
          
Mortgages Loans Payable And Other Obligations [Line Items]          
Property Name     Port Imperial South (h) [6]    
Lender     Wells Fargo Bank N.A. [6]    
LIBOR     LIBOR+2.75 [2],[6]    
Spread over LIBOR 0.0275% [2],[6]   0.0275% [2],[6]    
Mortgages, loans payable and other obligations 42,168 [6]   42,168 [6]    
Loan maturity date     Mar. 23, 2013 [6]    
9200 Edmonston Road [Member]
          
Mortgages Loans Payable And Other Obligations [Line Items]          
Property Name     9200 Edmonston Road    
Lender     Principal Commercial Funding L.L.C.    
Effective Rate 5.534% [2]   5.534% [2]    
Mortgages, loans payable and other obligations 4,305   4,305   4,479
Loan maturity date     May 01, 2013    
Port Imperial South 4/5 [Member]
          
Mortgages Loans Payable And Other Obligations [Line Items]          
Property Name     Port Imperial South 4/5 (h) [6]    
Lender     Wells Fargo Bank N.A. [6]    
LIBOR     LIBOR+3.50 [2],[6]    
Spread over LIBOR 0.035% [2],[6]   0.035% [2],[6]    
Mortgages, loans payable and other obligations 34,889 [6]   34,889 [6]    
Loan maturity date     Sep. 30, 2013 [6]    
6305 Ivy Lane [Member]
          
Mortgages Loans Payable And Other Obligations [Line Items]          
Property Name     6305 Ivy Lane    
Lender     John Hancock Life Insurance Co.    
Effective Rate 5.525% [2]   5.525% [2]    
Mortgages, loans payable and other obligations 5,984   5,984   6,245
Loan maturity date     Jan. 01, 2014    
395 West Passaic [Member]
          
Mortgages Loans Payable And Other Obligations [Line Items]          
Property Name     395 West Passaic    
Lender     State Farm Life Insurance Co.    
Effective Rate 6.004% [2]   6.004% [2]    
Mortgages, loans payable and other obligations 10,231   10,231   10,781
Loan maturity date     May 01, 2014    
6301 Ivy Lane [Member]
          
Mortgages Loans Payable And Other Obligations [Line Items]          
Property Name     6301 Ivy Lane    
Lender     John Hancock Life Insurance Co.    
Effective Rate 5.52% [2]   5.52% [2]    
Mortgages, loans payable and other obligations 5,667   5,667   5,899
Loan maturity date     Jul. 01, 2014    
35 Waterview Boulevard [Member]
          
Mortgages Loans Payable And Other Obligations [Line Items]          
Property Name     35 Waterview Boulevard    
Lender     Wachovia CMBS    
Effective Rate 6.348% [2]   6.348% [2]    
Mortgages, loans payable and other obligations 18,746   18,746   19,051
Loan maturity date     Aug. 11, 2014    
6 Becker, 85 Livingston, 75 Livingston & 20 Waterview [Member]
          
Mortgages Loans Payable And Other Obligations [Line Items]          
Property Name     6 Becker, 85 Livingston, 75 Livingston & 20 Waterview    
Lender     Wachovia CMBS    
Effective Rate 10.22% [2]   10.22% [2]    
Mortgages, loans payable and other obligations 63,126   63,126   62,127
Loan maturity date     Aug. 11, 2014    
4 Sylvan [Member]
          
Mortgages Loans Payable And Other Obligations [Line Items]          
Property Name     4 Sylvan    
Lender     Wachovia CMBS    
Effective Rate 10.19% [2]   10.19% [2]    
Mortgages, loans payable and other obligations 14,485   14,485   14,438
Loan maturity date     Aug. 11, 2014    
10 Independence [Member]
          
Mortgages Loans Payable And Other Obligations [Line Items]          
Property Name     10 Independence    
Lender     Wachovia CMBS    
Effective Rate 12.44% [2]   12.44% [2]    
Mortgages, loans payable and other obligations 16,251   16,251   15,908
Loan maturity date     Aug. 11, 2014    
4 Becker [Member]
          
Mortgages Loans Payable And Other Obligations [Line Items]          
Property Name     4 Becker    
Lender     Wachovia CMBS    
Effective Rate 9.55% [2]   9.55% [2]    
Mortgages, loans payable and other obligations 38,274   38,274   37,769
Loan maturity date     May 11, 2016    
5 Becker [Member]
          
Mortgages Loans Payable And Other Obligations [Line Items]          
Property Name     5 Becker    
Lender     Wachovia CMBS    
Effective Rate 12.83% [2]   12.83% [2]    
Mortgages, loans payable and other obligations 12,507   12,507   12,056
Loan maturity date     May 11, 2016    
210 Clay [Member]
          
Mortgages Loans Payable And Other Obligations [Line Items]          
Property Name     210 Clay    
Lender     Wachovia CMBS    
Effective Rate 13.42% [2]   13.42% [2]    
Mortgages, loans payable and other obligations 12,275   12,275   11,844
Loan maturity date     May 11, 2016    
51 Imclone [Member]
          
Mortgages Loans Payable And Other Obligations [Line Items]          
Property Name     51 Imclone    
Lender     Wachovia CMBS    
Effective Rate 8.39% [2]   8.39% [2]    
Mortgages, loans payable and other obligations 3,878   3,878   3,886
Loan maturity date     May 11, 2016    
Various [Member]
          
Mortgages Loans Payable And Other Obligations [Line Items]          
Property Name     Various (f) [7]    
Lender     Prudential Insurance [7]    
Effective Rate 6.332% [2],[7]   6.332% [2],[7]    
Mortgages, loans payable and other obligations 149,281 [7]   149,281 [7]   150,000 [7]
Loan maturity date     Jan. 15, 2017 [7]    
Number of properties used to collateralized mortgage     7    
23 Main Street [Member]
          
Mortgages Loans Payable And Other Obligations [Line Items]          
Property Name     23 Main Street    
Lender     JPMorgan CMBS    
Effective Rate 5.587% [2]   5.587% [2]    
Mortgages, loans payable and other obligations 30,395   30,395   31,002
Loan maturity date     Sep. 01, 2018    
Harborside Plaza 5 [Member]
          
Mortgages Loans Payable And Other Obligations [Line Items]          
Property Name     Harborside Plaza 5    
Lender     The Northwestern Mutual Life Insurance Co. & New York Life Insurance Co.    
Effective Rate 6.842% [2]   6.842% [2]    
Mortgages, loans payable and other obligations 228,481   228,481   231,603
Loan maturity date     Nov. 01, 2018    
223 Canoe Brook Road [Member]
          
Mortgages Loans Payable And Other Obligations [Line Items]          
Property Name     223 Canoe Brook Road (h) [6]    
Lender     The Provident Bank [6]    
Effective Rate 4.375% [2],[6]   4.375% [2],[6]    
Mortgages, loans payable and other obligations 3,945 [6]   3,945 [6]    
Loan maturity date     Feb. 01, 2019 [6]    
100 Walnut Avenue [Member]
          
Mortgages Loans Payable And Other Obligations [Line Items]          
Property Name     100 Walnut Avenue    
Lender     Guardian Life Insurance Co.    
Effective Rate 7.311% [2]   7.311% [2]    
Mortgages, loans payable and other obligations 19,025   19,025   19,241
Loan maturity date     Feb. 01, 2019    
One River Center [Member]
          
Mortgages Loans Payable And Other Obligations [Line Items]          
Property Name     One River Center (g) [8]    
Lender     Guardian Life Insurance Co. [8]    
Effective Rate 7.311% [2],[8]   7.311% [2],[8]    
Mortgages, loans payable and other obligations $ 43,582 [8]   $ 43,582 [8]   $ 44,079 [8]
Loan maturity date     Feb. 01, 2019 [8]    
Number of properties used to collateralized mortgage     3    
[1] On March 28, 2012, the Company transferred the deed for 2200 Renaissance Boulevard to the lender in satisfaction of its obligations. See Note 7: Discontinued Operations.
[2] Reflects effective rate of debt, including deferred financing costs, comprised of the cost of terminated treasury lock agreements (if any), debt initiation costs, mark-to-market adjustment of acquired debt and other transaction costs, as applicable.
[3] On September 4, 2012, the Company repaid this mortgage loan at par, using borrowings under the Company’s unsecured revolving credit facility.
[4] On November 21, 2012, the Company repaid this mortgage loan at par, using proceeds from the sale of senior unsecured notes on November 20, 2012.
[5] On November 20, 2012, the Company repaid this mortgage loan, including a prepayment premium, using proceeds from the sale of senior unsecured notes on November 20, 2012. In connection with this payoff, the Company recorded approximately $0.5 million as a loss from early extinguishment of debt.
[6] Mortgages assumed in connection with the Roseland Transaction. See Note 3: Roseland Transaction.
[7] Mortgage is collateralized by seven properties. The Operating Partnership has agreed, subject to certain conditions, to guarantee repayment of a portion of the loan.
[8] Mortgage is collateralized by the three properties comprising One River Center.