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Nature Of Business (Details) (USD $) | 12 Months Ended | 0 Months Ended | 12 Months Ended | 3 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 |  |  |
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Aug. 31, 2012 Research Boulevard 1700 [Member] | Dec. 20, 2012 Plumtree Medical Center [Member] | Sep. 02, 2011 Dulles Station, Phase I [Member] | Dec. 31, 2011 Dulles Station, Phase I [Member] | Dec. 31, 2011 Dulles Station II [Member] | Aug. 05, 2011 Industrial Portfolio [Member] | Dec. 31, 2011 Industrial Portfolio [Member] | Jun. 18, 2010 Parklawn Portfolio [Member] | Dec. 31, 2010 Parklawn Portfolio [Member] | Dec. 21, 2010 The Ridges [Member] | Dec. 31, 2010 The Ridges [Member] | Dec. 22, 2010 Ammendale I and II and Amvax [Member] | Dec. 31, 2010 Ammendale I and II and Amvax [Member] | Dec. 31, 2012 Taxable Reit Subsidiary [Member] | Dec. 31, 2011 Taxable Reit Subsidiary [Member] | Aug. 05, 2011 Office Building [Member] Industrial Portfolio [Member] properties | Aug. 05, 2011 Office Building [Member] Parklawn Portfolio [Member] properties
Nature of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Distribution of Ordinary Taxable Income | 90.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain and Sale | $ 5,124,000 | $ 97,491,000 | $ 21,599,000 | $ 3,724,000 | [1] | $ 1,400,000 | $ 0 | $ 0 |  | $ 97,491,000 | $ 97,491,000 | $ 7,942,000 | $ 7,942,000 | [1] | $ 4,441,000 | $ 4,441,000 | $ 9,216,000 | $ 9,216,000 |  |  |  |
Number of real estate properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 | 3
Federal and state income tax liabilities recognized | 0 | 1,138,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate impairment | 2,097,000 | 14,526,000 | 0 |  |  |  |  | 600,000 | 14,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Tax Assets | 5,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Tax Assets, Net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 100,000 |  |
Deferred Tax Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 600,000 | $ 500,000 |  |
Ordinary income | 72.00% | 60.00% | 55.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Return of capital | 26.00% | 17.00% | 31.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Qualified dividends | 0.00% | 5.00% | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecaptured Section 1250 gain | 2.00% | 13.00% | 11.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital gain | 0.00% | 5.00% | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[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.

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