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, 2014 sqft	Mar. 31, 2013
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	$ 16,400,000
Spread over LIBOR	3.00%
Mortgage loan, maturity date	May 2016
LIBOR interest rate	0.15%
Fixed interest rate	3.99375%
Notional amount	13,650,000
Management, leasing and other services fees	$ 26,700	$ 27,000