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) (Red Bank Corporate Plaza, L.L.C. [Member], USD $)
3 Months Ended
Mar. 31, 2013
sqft
Mar. 31, 2012
Red Bank Corporate Plaza, L.L.C. [Member]
   
Schedule of Equity Method Investments [Line Items]    
Area of property (in square feet) 92,878  
Lease expiration date Sep. 30, 2017  
Percentage of interest in venture 50.00%  
Mortgage loans, carrying amount $ 17,200,000  
Spread over LIBOR 3.00%  
Mortgage loan, maturity date May 2016  
LIBOR Interest Rate 0.20%  
Percentage of loan that has a fixed interest rate 75.00%  
Fixed interest rate 3.99375%  
Management, leasing and other services fees $ 27,000 $ 25,000