Quarterly report pursuant to Section 13 or 15(d)

Real Estate Discontinued Operations (Details)

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Real Estate Discontinued Operations (Details) (USD $)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
sqft
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Rentable square feet         3,272,000
Contract purchase price         $ 409,700,000
Revenues 0 8,931,000 0 19,014,000  
Property expenses 0 (2,468,000) 0 (5,796,000)  
Real estate impairment 0 0 0 (599,000)  
Depreciation and amortization 0 (2,933,000) 0 (6,287,000)  
Interest expense 0 (232,000) 0 (465,000)  
Income from operations of properties sold or held for sale 0 3,298,000 0 5,867,000  
Less: Net income attributable to noncontrolling interests in subsidiaries 0 (34,000) 0 (57,000)  
Income from operations of properties sold or held for sale attributable to the controlling interests 0 3,264,000 0 5,810,000  
Industrial Portfolio Member
         
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Number of Office Assets         2
Property type     Industrial/Office   Industrial/Office [1]
Rentable square feet         3,092,000 [1]
Contract purchase price         350,900,000 [1]
Income from operations of properties sold or held for sale 0 3,308,000 0 6,335,000  
Dulles Station, Phase I [Member]
         
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Property type     Office   Office
Rentable square feet         180,000
Contract purchase price         58,800,000
Income from operations of properties sold or held for sale 0 (10,000) 0 (468,000)  
Asset impairment charges       $ 600,000  
[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). On October 3, 2011, we closed on the sale of Northern Virginia Industrial Park II. On November 2, 2011, we closed on the sale of 6100 Columbia Park Road and Dulles Business Park I and II.