Quarterly report pursuant to Section 13 or 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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2013
Jul. 15, 2013
Dec. 31, 2012
Mortgages Loans Payable And Other Obligations [Line Items]        
Spread over LIBOR     1.25%  
Mortgages, loans payable and other obligations $ 753,054 $ 753,054   $ 757,495
Loss from early extinguishment of debt 703 703    
51 Imclone [Member]
        
Mortgages Loans Payable And Other Obligations [Line Items]        
Property Name   51 Imclone (b) [1]    
Lender   Wachovia CMBS [1]    
Effective Rate 8.39% [1],[2] 8.39% [1],[2]    
Mortgages, loans payable and other obligations    [1]    [1]   3,878 [1]
9200 Edmonston Road [Member]
        
Mortgages Loans Payable And Other Obligations [Line Items]        
Property Name   9200 Edmonston Road (c) [3]    
Lender   Principal Commercial Funding L.L.C. [3]    
Effective Rate 5.534% [2],[3] 5.534% [2],[3]    
Mortgages, loans payable and other obligations 4,243 [3] 4,243 [3]   4,305 [3]
Loan maturity date   May 01, 2013 [3]    
Percentage of leased property occupied 100.00% 100.00%    
Port Imperial South [Member]
        
Mortgages Loans Payable And Other Obligations [Line Items]        
Property Name   Port Imperial South    
Lender   Wells Fargo Bank N.A.    
LIBOR   LIBOR+2.75 [2]    
Spread over LIBOR 2.75% [2] 2.75% [2]    
Mortgages, loans payable and other obligations 42,500 42,500   42,168
Loan maturity date   Aug. 20, 2013    
Port Imperial South 4/5 [Member]
        
Mortgages Loans Payable And Other Obligations [Line Items]        
Property Name   Port Imperial South 4/5    
Lender   Wells Fargo Bank N.A.    
LIBOR   LIBOR+3.50 [2]    
Spread over LIBOR 3.50% [2] 3.50% [2]    
Mortgages, loans payable and other obligations 36,355 36,355   34,889
Loan maturity date   Sep. 30, 2013    
6305 Ivy Lane [Member]
        
Mortgages Loans Payable And Other Obligations [Line Items]        
Property Name   6305 Ivy Lane    
Lender   RGA Reinsurance Company    
Effective Rate 5.525% [2] 5.525% [2]    
Mortgages, loans payable and other obligations 5,876 5,876   5,984
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 9,995 9,995   10,231
Loan maturity date   May 01, 2014    
6301 Ivy Lane [Member]
        
Mortgages Loans Payable And Other Obligations [Line Items]        
Property Name   6301 Ivy Lane    
Lender   RGA Reinsurance Company    
Effective Rate 5.52% [2] 5.52% [2]    
Mortgages, loans payable and other obligations 5,572 5,572   5,667
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 18,583 18,583   18,746
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 63,665 63,665   63,126
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 14,511 14,511   14,485
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 16,438 16,438   16,251
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 38,536 38,536   38,274
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 12,751 12,751   12,507
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 12,513 12,513   12,275
Loan maturity date   May 11, 2016    
Various [Member]
        
Mortgages Loans Payable And Other Obligations [Line Items]        
Property Name   Various (d) [4]    
Lender   Prudential Insurance [4]    
Effective Rate 6.332% [2],[4] 6.332% [2],[4]    
Mortgages, loans payable and other obligations 148,393 [4] 148,393 [4]   149,281 [4]
Loan maturity date   Jan. 15, 2017 [4]    
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 30,144 30,144   30,395
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 226,838 226,838   228,481
Loan maturity date   Nov. 01, 2018    
223 Canoe Brook Road [Member]
        
Mortgages Loans Payable And Other Obligations [Line Items]        
Property Name   233 Canoe Brook Road    
Lender   The Provident Bank    
Effective Rate 4.375% [2] 4.375% [2]    
Mortgages, loans payable and other obligations 3,911 3,911   3,945
Loan maturity date   Feb. 01, 2019    
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 18,910 18,910   19,025
Loan maturity date   Feb. 01, 2019    
One River Center [Member]
        
Mortgages Loans Payable And Other Obligations [Line Items]        
Property Name   One River Center (e) [5]    
Lender   Guardian Life Insurance Co. [5]    
Effective Rate 7.311% [2],[5] 7.311% [2],[5]    
Mortgages, loans payable and other obligations $ 43,320 [5] $ 43,320 [5]   $ 43,582 [5]
Loan maturity date   Feb. 01, 2019 [5]    
Number of properties used to collateralized mortgage   3    
[1] With the sale of the property on May 31, 2013, the mortgage was satisfied by the Company. The Company incurred $0.7 million in costs for the debt satisfaction, which was included in discontinued operations: loss from early retirement of debt for the three and six months ended June 30, 2013.
[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] The lease with the tenant occupying 100 percent of the building expired on May 1, 2013 and the tenant continues to occupy the building on a month-to-month basis. The mortgage loan matured on May 1, 2013 and was not repaid. The Company received a notice of default from the lender on July 17, 2013. The Company has requested a modification of the loan terms and is also in discussions regarding a deed-in-lieu of foreclosure with the lender.
[4] Mortgage is collateralized by seven properties. The Operating Partnership has agreed, subject to certain conditions, to guarantee repayment of a portion of the loan.
[5] Mortgage is collateralized by the three properties comprising One River Center