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Real Estate Investments Acquisitions and Dispositions (Details) (USD $)	9 Months Ended										0 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Aug. 05, 2013 Dabney Land, East [Member] acre	Jun. 28, 2013 The Bluffs [Member] sqft	Jun. 19, 2013 1700 Paoli Pike [Member] sqft	Jun. 28, 2013 100 Arrandale Boulevard [Member] sqft	Jun. 14, 2013 Pacific View Plaza [Member] sqft	Feb. 25, 2013 Princeton Pike Corporate Center [Member] sqft Properties	Jul. 31, 2013 4040 Wilson Venture [Member]	Jan. 25, 2013 Brandywine Realty Trust [Member] The Grove at Cira Centre South [Member]	Apr. 25, 2013 Three Logan Square [Member] acre
Significant Acquisitions and Disposals [Line Items]
Construction Loan									$ 122,300,000
Equity Method Investment, Ownership Percentage									50.00%	30.00%
Number of real estate properties sold								8
Net Rentable Space Sold				67,909	28,000	34,931	51,695	800,546
Sale Consideration Of Sold Property			500,000	18,000,000	2,700,000	3,500,000	10,300,000	121,000,000
Lease percentage of sold property				98.80%			90.50%	86.90%
Business Acquisition, Cost of Acquired Entity, Purchase Price											20,800,000
Adjustment to Record Land Acquisition to Fair Value	(4,386,000)	0									4,300,000
Business Acquisition, Cost of Acquired Entity, Transaction Costs											$ 100,000
Land Sold			8
Area of Land											1.8