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Selected Quarterly Financial Data (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate rental revenue | $ 77,071 | [1],[2] | $ 77,108 | [1],[2] | $ 75,590 | [1],[2] | $ 75,214 | [1],[2] | $ 75,413 | [1],[2] | $ 70,550 | [1],[2] | $ 70,321 | [1],[2] | $ 67,872 | [1],[2] | $ 304,983 | $ 284,156 | $ 253,127
Income (loss) from continuing operations | 1,248 | [1],[2] | 5,323 | [1],[2] | 5,694 | [1],[2] | 4,834 | [1],[2] | (10,844) | [1],[2],[3] | 2,275 | [1],[2] | 3,963 | [1],[2] | 1,708 | [1],[2] | 17,099 | (2,898) | (609)
Effect of disposal of industrial segment on net income | 0 |  | 0 |  | 0 |  | 0 |  | 399 |  | 4,388 |  | 5,978 |  | 5,719 |  |  |  |
Net income | 2,958 | [1],[2],[3] | 9,561 | [1],[2] | 6,008 | [1],[2] | 5,181 | [1],[2] | 31,098 | [1],[2] | 63,036 | [1],[2] | 6,556 | [1],[2] | 4,688 | [1],[2] | 23,708 | 105,378 | 37,559
Net income attributable to the controlling interests | 2,958 | [1],[2] | 9,561 | [1],[2] | 6,008 | [1],[2] | 5,181 | [1],[2] | 30,689 | [1],[2] | 63,008 | [1],[2] | 6,522 | [1],[2] | 4,665 | [1],[2] | 23,708 | 104,884 | 37,426
Continuing operations - basic (in dollars per share) | $ 0.02 | [1],[2] | $ 0.08 | [1],[2] | $ 0.08 | [1],[2] | $ 0.07 | [1],[2] | $ (0.16) | [1],[2] | $ 0.03 | [1],[2] | $ 0.08 | [1],[2] | $ 0.03 | [1],[2] | $ 0.25 | $ (0.04) | $ (0.01)
Continuing operations - diluted (in dollars per share) | $ 0.02 | [1],[2] | $ 0.08 | [1],[2] | $ 0.08 | [1],[2] | $ 0.07 | [1],[2] | $ (0.16) | [1],[2] | $ 0.03 | [1],[2] | $ 0.08 | [1],[2] | $ 0.03 | [1],[2] | $ 0.25 | $ (0.04) | $ (0.01)
Net income per share, Basic | $ 0.04 | [1],[2] | $ 0.14 | [1],[2] | $ 0.09 | [1],[2] | $ 0.08 | [1],[2] | $ 0.46 | [1],[2] | $ 0.95 | [1],[2] | $ 0.10 | [1],[2] | $ 0.07 | [1],[2] | $ 0.35 | $ 1.58 | $ 0.60
Net income per share, Diluted | $ 0.04 | [1],[2] | $ 0.14 | [1],[2] | $ 0.09 | [1],[2] | $ 0.08 | [1],[2] | $ 0.46 | [1],[2] | $ 0.95 | [1],[2] | $ 0.10 | [1],[2] | $ 0.07 | [1],[2] | $ 0.35 | $ 1.58 | $ 0.60
Real estate impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,097 | 14,526 | 0
Dulles Station II [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate impairment |  |  |  |  |  |  |  |  | 14,500 |  |  |  |  |  |  |  |  |  |
4661 Kenmore Avenue [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate impairment | $ 2,100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | With regard to per share calculations, the sum of the quarterly results may not equal full year results due to rounding.
[2] | The prior quarter results have been restated to conform to the current quarter presentation. Specifically, results related to properties sold or held for sale have been reclassified into discontinued operations.
[3] | The three months ended December 31, 2012 and 2011 include the impact of real estate impairments of $2.1 million and $14.5 million, respectively.

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- Definition The aggregate revenue from real estate operations during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
Name: | us-gaap_RealEstateRevenueNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration