Quarterly report pursuant to Section 13 or 15(d)

Real Estate Acquisitions And Discontinued Operations (Real Estate Sold During 2011 And 2010) (Details)

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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 Type Total 2011 Total 2010
Rental Square Feet 3,272,000 638,000
Contract Purchase Price $ 408.8 $ 73.9
Industrial Portfolio [Member]
   
Real Estate Properties [Line Items]    
Disposition Date September 2, 2011 [1]  
Property Type Industrial/Office [1]  
Rental Square Feet 3,092,000 [1]  
Contract Purchase Price 350.0 [1]  
Dulles Station, Phase I [Member]
   
Real Estate Properties [Line Items]    
Disposition Date April 5, 2011  
Property Type Office  
Rental Square Feet 180,000  
Contract Purchase Price 58.8  
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 Type Office Office
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).