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Real Estate Acquisitions And Discontinued Operations (Real Estate Sold During 2011 And 2010) (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Real Estate Properties [Line Items]  
Property TypeTotal 2011Total 2010
Rental Square Feet3,272,000638,000
Contract Purchase Price$ 408.8$ 73.9
Industrial Portfolio [Member]
  
Real Estate Properties [Line Items]  
Disposition DateSeptember 2, 2011[1] 
Property TypeIndustrial/Office[1] 
Rental Square Feet3,092,000[1] 
Contract Purchase Price350.0[1] 
Dulles Station, Phase I [Member]
  
Real Estate Properties [Line Items]  
Disposition DateApril 5, 2011 
Property TypeOffice 
Rental Square Feet180,000 
Contract Purchase Price58.8 
Parklawn Portfolio [Member]
  
Real Estate Properties [Line Items]  
Disposition Date June 18, 2010[2]
Property Type Office/Industrial[2]
Rental Square Feet 229,000[2]
Contract Purchase Price 23.4[2]
The Ridges [Member]
  
Real Estate Properties [Line Items]  
Disposition Date December 21, 2010
Property TypeOfficeOffice
Rental Square Feet 104,000
Contract Purchase Price 27.5
Ammendale I&II and Amvax [Member]
  
Real Estate Properties [Line Items]  
Disposition Date December 22, 2010
Property Type Industrial
Rental Square Feet 305,000
Contract Purchase Price $ 23.0
[1] The Industrial Portfolio consists of every property in our industrial segment and two office properties (the Crescent and Albemarle Point). On September 2, 2011 we closed on the sale of industrial properties (8880 Gorman Road, Dulles South IV, Fullerton Business Center, Hampton Overlook, Alban Business Center, Pickett Industrial Park, Northern Virginia Industrial Park I, 270 Technology Park, Fullerton Industrial Center, Sully Square, 9950 Business Parkway, Hampton South and 8900 Telegraph Road) and two office properties (Crescent and Albemarle Point). We closed on the sales of the remaining properties in the Industrial Portfolio subsequent to the end of the 2011 Quarter.
[2] The Parklawn Portfolio consists of three office properties (Parklawn Plaza, Lexington Building and Saratoga Building) and one industrial property (Charleston Business Center).