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Nature Of Business (Details) (USD $)
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3 Months Ended | 12 Months Ended | 0 Months Ended | 2 Months Ended | 0 Months Ended | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Aug. 31, 2012
Research Boulevard 1700 [Member]
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Dec. 20, 2012
Plumtree Medical Center [Member]
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Apr. 05, 2011
Dulles Station, Phase I [Member]
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Nov. 02, 2011
Industrial Portfolio [Member]
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Dec. 31, 2013
Taxable Reit Subsidiary [Member]
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Dec. 31, 2012
Taxable Reit Subsidiary [Member]
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Mar. 19, 2013
Office Building [Member]
Atrium Building [Member]
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Aug. 05, 2011
Office Building [Member]
Industrial Portfolio [Member]
properties
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| Nature of Business [Line Items] | ||||||||||||||||
| Percentage of Distribution of Ordinary Taxable Income | 90.00% | |||||||||||||||
| Gain on sale of properties | $ 22,144,000 | $ 5,124,000 | $ 97,491,000 | $ 3,724,000 | $ 1,400,000 | $ 0 | $ 97,491,000 | [1] | $ 3,195,000 | |||||||
| Number of real estate properties | 2 | |||||||||||||||
| Federal and state income tax liabilities recognized | 0 | 0 | 1,138,000 | |||||||||||||
| Real estate impairment | 2,097,000 | 14,526,000 | 0 | 0 | 14,526,000 | |||||||||||
| Deferred Tax Assets | 5,700,000 | |||||||||||||||
| Deferred Tax Assets, Net | 0 | 0 | ||||||||||||||
| Deferred Tax Liabilities | $ 600,000 | $ 600,000 | ||||||||||||||
| Ordinary income | 62.00% | 72.00% | 60.00% | |||||||||||||
| Return of capital | 38.00% | 26.00% | 17.00% | |||||||||||||
| Qualified dividends | 0.00% | 0.00% | 5.00% | |||||||||||||
| Unrecaptured Section 1250 gain | 0.00% | 2.00% | 13.00% | |||||||||||||
| Capital gain | 0.00% | 0.00% | 5.00% | |||||||||||||
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