Quarterly report pursuant to Section 13 or 15(d)

Investments In Unconsolidated Joint Ventures (Red Bank Corporate Plaza, L.L.C.) (Narrative) (Details)

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Investments In Unconsolidated Joint Ventures (Red Bank Corporate Plaza, L.L.C.) (Narrative) (Details) (USD $)
3 Months Ended 6 Months Ended
Jul. 15, 2013
Jun. 30, 2013
Red Bank Corporate Plaza, L.L.C. [Member]
sqft
Jun. 30, 2012
Red Bank Corporate Plaza, L.L.C. [Member]
Jun. 30, 2013
Red Bank Corporate Plaza, L.L.C. [Member]
sqft
Jun. 30, 2012
Red Bank Corporate Plaza, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]          
Area of property (in square feet)   92,878   92,878  
Lease expiration date       Sep. 30, 2017  
Percentage of interest in venture   50.00%   50.00%  
Mortgage loans, carrying amount   $ 17,000,000   $ 17,000,000  
Spread over LIBOR 1.25% 3.00%   3.00%  
Mortgage loan, maturity date       May 2016  
LIBOR Interest Rate   0.19%   0.19%  
Percentage of loan that has a fixed interest rate   75.00%   75.00%  
Fixed interest rate   3.99375%   3.99375%  
Management, leasing and other services fees   $ 27,000 $ 25,000 $ 54,000 $ 50,000