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
 6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Mortgages Loans Payable And Other Obligations [Line Items]    
Mortgages, loans payable and other obligations $ 721,302 $ 739,448
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]  
Mortgages, loans payable and other obligations   16,171 [1]
One Grande Commons [Member]
    
Mortgages Loans Payable And Other Obligations [Line Items]    
Property Name One Grande Commons (c) [3]  
Lender Capital One Bank [3]  
LIBOR LIBOR+2.00 [2],[3]  
Effective Rate 2.00% [2],[3]  
Mortgages, loans payable and other obligations 11,000 [3] 11,000 [3]
Loan maturity date Dec. 31, 2012 [3]  
Number of extension options 2  
Mortgage loan, extension period 1 year  
Soundview Plaza [Member]
    
Mortgages Loans Payable And Other Obligations [Line Items]    
Property Name Soundview Plaza  
Lender Morgan Stanley Mortgage Capital  
Effective Rate 6.015% [2]  
Mortgages, loans payable and other obligations 15,240 15,531
Loan maturity date Jan. 01, 2013  
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]  
Mortgages, loans payable and other obligations 4,393 4,479
Loan maturity date May 01, 2013  
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]  
Mortgages, loans payable and other obligations 6,125 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]  
Mortgages, loans payable and other obligations 10,526 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]  
Mortgages, loans payable and other obligations 5,793 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]  
Mortgages, loans payable and other obligations 18,901 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]  
Mortgages, loans payable and other obligations 62,614 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]  
Mortgages, loans payable and other obligations 14,461 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]  
Mortgages, loans payable and other obligations 16,074 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]  
Mortgages, loans payable and other obligations 38,016 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]  
Mortgages, loans payable and other obligations 12,274 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]  
Mortgages, loans payable and other obligations 12,053 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]  
Mortgages, loans payable and other obligations 3,882 3,886
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]  
Mortgages, loans payable and other obligations 150,000 [4] 150,000 [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]  
Mortgages, loans payable and other obligations 30,725 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 LifeInsurance Co. & New York LifeInsurance Co.  
Effective Rate 6.842% [2]  
Mortgages, loans payable and other obligations 230,068 231,603
Loan maturity date Nov. 01, 2018  
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]  
Mortgages, loans payable and other obligations 19,135 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 (e) [5]  
Lender Guardian Life Insurance Co. [5]  
Effective Rate 7.311% [2],[5]  
Mortgages, loans payable and other obligations 43,835 [5] 44,079 [5]
Loan maturity date Feb. 01, 2019 [5]  
Number of properties used to collateralized mortgage 3  
581 Main Street [Member]
    
Mortgages Loans Payable And Other Obligations [Line Items]    
Property Name 581 Main Street (f) [6]  
Lender Valley National Bank [6]  
Effective Rate 6.935% [2],[6],[7]  
Mortgages, loans payable and other obligations $ 16,187 [6] $ 16,338 [6]
Loan maturity date Jul. 01, 2034 [6]  
Basis points of the interest rate at the reset period 225  
Treasury yield period 10 years  
Period prior to reset date that interest rate will be reset 45 days  
Minimum interest rate for the loan after the reset period 6.875%  
Coupon Interest Rate Reset One [Member] | 581 Main Street [Member]
    
Mortgages Loans Payable And Other Obligations [Line Items]    
Interest rate will be reset after the end of period 10 years  
Coupon Interest Rate Reset Two [Member] | 581 Main Street [Member]
    
Mortgages Loans Payable And Other Obligations [Line Items]    
Interest rate will be reset after the end of period 20 years  
[1] On March 28, 2012, the Company transferred the deed for 2200 Renaissance Boulevard to the lender in satisfaction of its obligations. See Note 6: 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] The mortgage loan has two one-year extension options subject to certain conditions and the payment of a fee.
[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.
[6] The Operating Partnership has agreed, subject to certain conditions, to guarantee repayment of a portion of the loan.
[7] The coupon interest rate will be reset at the end of year 10 (2019) and year 20 (2029) at 225 basis points over the 10-year treasury yield 45 days prior to the reset dates with a minimum rate of 6.875 percent.