Annual report pursuant to Section 13 and 15(d)

Real Estate Investments - Discontinued Operations (Details)

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Real Estate Investments - Discontinued Operations (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2012
sqft
Dec. 31, 2011
sqft
Dec. 31, 2010
sqft
Dec. 31, 2009
Dec. 31, 2012
Office property [Member]
Dec. 31, 2011
Office property [Member]
Dec. 31, 2012
Industrial Flex [Member]
Dec. 31, 2011
Industrial Flex [Member]
Aug. 31, 2012
Research Boulevard 1700 [Member]
Dec. 31, 2012
Research Boulevard 1700 [Member]
sqft
Dec. 31, 2011
Research Boulevard 1700 [Member]
Dec. 31, 2010
Research Boulevard 1700 [Member]
Dec. 20, 2012
Plumtree Medical Center [Member]
Dec. 31, 2012
Plumtree Medical Center [Member]
sqft
Dec. 31, 2011
Plumtree Medical Center [Member]
Dec. 31, 2010
Plumtree Medical Center [Member]
Dec. 31, 2012
Atrium Building [Member]
sqft
Dec. 31, 2011
Atrium Building [Member]
Dec. 31, 2010
Atrium Building [Member]
Aug. 05, 2011
Industrial Portfolio [Member]
Dec. 31, 2012
Industrial Portfolio [Member]
Dec. 31, 2011
Industrial Portfolio [Member]
sqft
Dec. 31, 2010
Industrial Portfolio [Member]
Sep. 02, 2011
Dulles Station, Phase I [Member]
Dec. 31, 2012
Dulles Station, Phase I [Member]
Dec. 31, 2011
Dulles Station, Phase I [Member]
sqft
Dec. 31, 2010
Dulles Station, Phase I [Member]
Jun. 18, 2010
Parklawn Portfolio [Member]
Dec. 31, 2010
Parklawn Portfolio [Member]
sqft
Dec. 21, 2010
The Ridges [Member]
Dec. 31, 2012
The Ridges [Member]
Dec. 31, 2011
The Ridges [Member]
Dec. 31, 2010
The Ridges [Member]
sqft
Dec. 22, 2010
Ammendale I and II and Amvax [Member]
Dec. 31, 2010
Ammendale I and II and Amvax [Member]
sqft
Dec. 31, 2012
Ammendale I and II [Member]
Dec. 31, 2011
Ammendale I and II [Member]
Dec. 31, 2010
Ammendale I and II [Member]
Dec. 31, 2012
Amvax [Member]
Dec. 31, 2011
Amvax [Member]
Dec. 31, 2010
Amvax [Member]
Dec. 31, 2012
Parklawn Plaza [Member]
Dec. 31, 2011
Parklawn Plaza [Member]
Dec. 31, 2010
Parklawn Plaza [Member]
Dec. 31, 2012
Lexington Building [Member]
Dec. 31, 2011
Lexington Building [Member]
Dec. 31, 2010
Lexington Building [Member]
Dec. 31, 2012
Saratoga Building [Member]
Dec. 31, 2011
Saratoga Building [Member]
Dec. 31, 2010
Saratoga Building [Member]
Dec. 31, 2012
Charleston Business Center [Member]
Dec. 31, 2011
Charleston Business Center [Member]
Dec. 31, 2010
Charleston Business Center [Member]
Dec. 31, 2012
Industrial Segment Member
Dec. 31, 2011
Industrial Segment Member
Dec. 31, 2010
Industrial Segment Member
Dec. 31, 2012
Discontinued Properties Member
Dec. 31, 2011
Discontinued Properties Member
Dec. 31, 2010
Discontinued Properties Member
Aug. 05, 2011
Office Building [Member]
Industrial Portfolio [Member]
properties
Aug. 05, 2011
Office Building [Member]
Parklawn Portfolio [Member]
properties
Aug. 05, 2011
Industrial Property [Member]
Parklawn Portfolio [Member]
properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                                                                                                            
Real Estate Held-for-sale $ 11,528 $ 27,669     $ 17,450 $ 33,637 $ 0 $ 8,261                                                                                                            
Real Estate Held-for-sale, Gross 17,450 41,898                                                                                                                        
Less accumulated depreciation (610,536) (535,732) (538,786) (475,245)                                                                                                         (5,922) (14,229)        
Rentable Square Feet 213,000.0 3,272,000.0 638,000.0             101,000.0 [1]       33,000.0     79,000.0         3,092,000.0 [2]       180,000.0     229,000.0 [1]       104,000.0   305,000.0                                                      
Contract Sales Price 23,000 409,700 73,930             14,250 [1]       8,750           350,900 [2]           58,800     23,430 [1]       27,500   23,000                                                      
Gain on sale of properties 5,124 97,491 21,599           3,724 [1]       1,400             97,491   97,491   0   0   7,942 7,942 [1] 4,441     4,441 9,216 9,216                                                      
Number of real estate properties                                                                                                                       2 3 1
Real estate revenues                                                                                                           0 23,045 32,191 4,155 31,525 53,009      
Property expenses                                                                                                                 (1,542) (9,547) (17,163)      
Real estate impairment (2,097) (14,526) 0                                             (600)                                                             0 (599) 0      
Depreciation and amortization (103,934) (100,528) (95,746)                                                                                                           (867) (8,723) (17,263)      
Interest expense                                                                                                                 (261) (733) (2,014)      
Income from operations of properties sold or held for sale 1,485 11,923 16,569             225 651 670   197 67 48 1,063 1,052 883   0 10,621 11,647   0 (468) 492       0 0 678     0 0 1,023 0 0 336 0 0 132 0 0 65 0 0 225 0 0 370                  
Segment                   Office       Medical Office     Office       Industrial/Office       Office           Office         Industrial     Industrial     Office     Office     Office     Industrial                      
Net income $ 6,609 $ 108,276 $ 38,168                                                                                                     $ 0 $ 16,484 $ 22,857            
Discontinued operations (in dollars per share) $ 0.10 $ 1.62 $ 0.61                                                                                                     $ 0.00 $ 0.23 $ 0.36            
Discontinued operations (in dollars per share) $ 0.10 $ 1.62 $ 0.61                                                                                                     $ 0.00 $ 0.23 $ 0.36            
[1] 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.
[2] The Parklawn Portfolio consists of three office properties (Parklawn Plaza, Lexington Building and Saratoga Building) and one industrial property (Charleston Business Center).