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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.

X

- 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

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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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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