Investments In Unconsolidated Joint Ventures (Red Bank Corporate Plaza) (Details) (Red Bank Corporate Plaza [Member], USD $)	0 Months Ended	1 Months Ended	3 Months Ended		6 Months Ended
	Sep. 22, 2011	May 31, 2011	Jun. 30, 2012 sqft	Jun. 30, 2011	Jun. 30, 2012 sqft	Jun. 30, 2011
Red Bank Corporate Plaza [Member]
Schedule of Equity Method Investments [Line Items]
Area of office property, 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		$ 20,300,000
Spread over LIBOR		125			300
Mortgage loan, maturity date					May 17, 2016	May 2011
Repayment of mortgage loan		1,700,000
New mortgage loan					17,700,000
LIBOR Interest Rate			0.24%		0.24%
Percentage of loan principal swapped	75.00%
Fixed interest rate	3.99375%
Management, leasing and other services fees			$ 25,000	$ 24,000	$ 50,000	$ 48,000