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Real Estate Investments Discontinued Operations (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2011
sqft
Dec. 31, 2010
sqft
Dec. 31, 2009
sqft
Aug. 05, 2011
Dec. 31, 2008
Dec. 31, 2011
Office property [Member]
Dec. 31, 2010
Office property [Member]
Dec. 31, 2011
Industrial Flex [Member]
Dec. 31, 2010
Industrial Flex [Member]
Dec. 31, 2011
Avondale [Member]
Dec. 31, 2010
Avondale [Member]
Dec. 31, 2009
Avondale [Member]
sqft
Dec. 31, 2011
Tech 100 Industrial Park [Member]
Dec. 31, 2010
Tech 100 Industrial Park [Member]
Dec. 31, 2009
Tech 100 Industrial Park [Member]
sqft
Dec. 31, 2011
Brandywine Center [Member]
Dec. 31, 2010
Brandywine Center [Member]
Dec. 31, 2009
Brandywine Center [Member]
sqft
Dec. 31, 2011
Crossroads Distribution Center [Member]
Dec. 31, 2010
Crossroads Distribution Center [Member]
Dec. 31, 2009
Crossroads Distribution Center [Member]
sqft
Dec. 31, 2011
Parklawn Plaza [Member]
Dec. 31, 2010
Parklawn Plaza [Member]
Dec. 31, 2009
Parklawn Plaza [Member]
Dec. 31, 2011
Lexington Building [Member]
Dec. 31, 2010
Lexington Building [Member]
Dec. 31, 2009
Lexington Building [Member]
Dec. 31, 2011
Saratoga Building [Member]
Dec. 31, 2010
Saratoga Building [Member]
Dec. 31, 2009
Saratoga Building [Member]
Dec. 31, 2011
Charleston Business Center [Member]
Dec. 31, 2010
Charleston Business Center [Member]
Dec. 31, 2009
Charleston Business Center [Member]
Dec. 31, 2011
The Ridges [Member]
Dec. 31, 2010
The Ridges [Member]
sqft
Dec. 31, 2009
The Ridges [Member]
Dec. 31, 2011
Ammendale I&II [Member]
Dec. 31, 2010
Ammendale I&II [Member]
Dec. 31, 2009
Ammendale I&II [Member]
Dec. 31, 2011
Amvax [Member]
Dec. 31, 2010
Amvax [Member]
Dec. 31, 2009
Amvax [Member]
Dec. 31, 2011
Dulles Station, Phase I [Member]
sqft
Dec. 31, 2010
Dulles Station, Phase I [Member]
Dec. 31, 2009
Dulles Station, Phase I [Member]
Aug. 05, 2011
Industrial Portfolio Member
Dec. 31, 2011
Industrial Portfolio Member
sqft
Dec. 31, 2010
Industrial Portfolio Member
Dec. 31, 2009
Industrial Portfolio Member
Dec. 31, 2010
Parklawn Portfolio [Member]
sqft
Dec. 31, 2010
Ammendale I and II and Amvax [Member]
sqft
Dec. 31, 2011
Industrial Segment Member
Dec. 31, 2010
Industrial Segment Member
Dec. 31, 2009
Industrial Segment Member
Dec. 31, 2011
Discontinued Properties Member
Dec. 31, 2010
Discontinued Properties Member
Dec. 31, 2009
Discontinued Properties Member
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                                                                                                  
Number Of Purchase And Sale Agreements Entered       5                                                                                                          
Number of Office Assets       2                                                                                                          
Real Estate Held-for-sale $ 0 $ 286,842       $ 0 $ 80,024 $ 0 $ 284,926                                                                                                
Real Estate Held-for-sale, Gross 0 364,950                                                                                                              
Less accumulated depreciation 535,732 538,786 475,245   406,241                                                                                                   0 78,108  
Real Estate and Accumulated Depreciation, Description of Property Total 2011 Total 2010 Total 2009             Multifamily   Multifamily Industrial   Industrial Office   Office Industrial   Industrial Office     Office     Office     Industrial     Office Office   Industrial     Industrial     Office       Industrial/Office [1]     Office/Industrial [2] Industrial            
Real estate revenues                                                                                                       23,045 32,191 34,288 26,154 47,646 53,726
Net income 106,506 36,567 31,225                                                                                                 16,484 22,857 24,905      
Basic net income per share $ 1.60 $ 0.58 $ 0.54                                                                                                 $ 0.23 $ 0.36 $ 0.43      
Diluted net income per share $ 1.60 $ 0.58 $ 0.54                                                                                                 $ 0.23 $ 0.36 $ 0.43      
Rentable Square Feet 3,272,000,000 638,000,000 456,000,000                 170,000,000     166,000,000     35,000,000     85,000,000                           104,000,000               180,000,000       3,092,000,000 [1]     229,000,000 [2] 305,000,000            
Contract Sales Price 409,700 73,900 38,000 [2]                 19,800 [2]     10,500 [2]     3,300 [2]     4,400 [2]                           27,500               58,800     350,900 [1]       23,400 [2] 23,000            
Gain (Loss) on Sale of Properties 97,491 21,600 13,300                                                                                     97,491                      
Gain on Sale of Properties 97,491 21,600 13,300                 6,700     4,100     1,000     1,500                           4,500               0             7,900 [2] 9,200            
Property expenses                                                                                                             7,697 15,248 16,646
Real estate impairment 14,526 0 0                                                                                                       599 0 0
Depreciation and amortization (100,528) (95,746) (94,447)                                                                                                       (7,231) (15,680) (16,896)
Interest expense                                                                                                             (474) (1,750) (2,307)
Income from operations of properties sold or held for sale $ 10,153 $ 14,968 $ 17,877             $ 0 $ 0 $ 392 $ 0 $ 0 $ 261 $ 0 $ 0 $ 85 $ 0 $ 0 $ 153 $ 0 $ 132 $ 147 $ 0 $ 65 $ 127 $ 0 $ 225 $ 436 $ 0 $ 370 $ 688 $ 0 $ 678 $ 175 $ 0 $ 1,023 $ 986 $ 0 $ 336 $ 327 $ (468) $ 492 $ 449   $ 10,621 $ 11,647 $ 13,651                
[1] The Parklawn Portfolio consists of three office properties (Parklawn Plaza, Lexington Building and Saratoga Building) and one industrial property (Charleston Business Center).
[2] The Industrial Portfolio consists of every property in our industrial segment and two office properties (the Crescent and Albemarle Point), and we closed on the sale on three separate dates. On September 2, 2011, we closed on the sale of the two office properties (the Crescent and Albemarle Point) and 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. On October 3, 2011, we closed the sale of Northern Virginia Industrial Park II. On November 1, 2011, we closed on the sale of 6100 Columbia Park Road and Dulles Business Park I and II.