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Real Estate Acquisitions And Discontinued Operations (Operating Income (Loss) By Property Classified As Discontinued Operations) (Details) (USD $) In Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010
Real Estate Properties [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Description of Property |  |  | Total 2011 |  | Total 2010
Income from operations of properties held for sale | $ 3,655 | $ 3,565 | $ 9,522 |  | $ 11,047
Parklawn Plaza [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Description of Property |  |  | Office |  |
Income from operations of properties held for sale |  |  |  |  | 132
Lexington Building [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Description of Property |  |  | Office |  |
Income from operations of properties held for sale |  |  |  |  | 65
Saratoga Building [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Description of Property |  |  | Office |  |
Income from operations of properties held for sale |  |  |  |  | 225
Charleston Business Center [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Description of Property |  |  | Industrial |  |
Income from operations of properties held for sale |  |  |  |  | 370
The Ridges [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Description of Property |  |  | Office |  | Office
Income from operations of properties held for sale |  | 156 |  |  | 347
Ammendale I&II [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Description of Property |  |  | Industrial |  |
Income from operations of properties held for sale |  | 217 |  |  | 733
Amvax [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Description of Property |  |  | Industrial |  |
Income from operations of properties held for sale |  | 82 |  |  | 260
Dulles Station, Phase I [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Description of Property |  |  | Office |  |
Income from operations of properties held for sale |  | 160 | (468) |  | 367
Industrial Portfolio [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Description of Property |  |  | Industrial/Office | [1] |
Income from operations of properties held for sale | $ 3,655 | $ 2,950 | $ 9,990 |  | $ 8,548
[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.

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- Definition After tax income (loss) from operations of a business component (exclusive of any gain (loss) on disposal, or provision therefore) during the reporting period, until its disposal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 43 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 47 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 + Details
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- Definition This description includes the geographical location and the type of property (unimproved land, parking garage, shopping center, garden apartment, retail outlet, multi-tenant commercial), and may include the name of the property (such as ABC Shopping Center). An amount not exceeding five percent of the total carrying amount of all real estate investments may be described as miscellaneous investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule III) -URI http://asc.fasb.org/extlink&oid=6882300&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
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