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Real Estate Investments - Dispositions (Textual) (Details) |  | 12 Months Ended
--- | --- | ---
Aug. 05, 2013 USD ($) a | Dec. 31, 2015 USD ($) ft² property | Dec. 31, 2014 USD ($) ft² property | Dec. 31, 2013 USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |
Number of Properties | property |  | 179 |  |
Impairment of properties held for use |  | $ 27,500,000 |  |
Aggregate carrying value |  | 40,400,000 |  |
Estimated Fair Value Of Impaired Property |  | $ 12,900,000 |  |
Net rentable space of property sold | ft² |  | 4,300,000 |  |
Net gain (loss) on sale of undepreciated real estate |  | $ 3,019,000 | $ 1,184,000 | $ (137,000)
1000 Atrium Way [Member] |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |
Net rentable space of property sold | ft² |  |  | 99,668 |
Libertyview [Member] |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |
Net rentable space of property sold | ft² |  |  | 121,737 |
A 100 Atrium Way and Liberty View [Member] |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |
Number of Properties | property |  |  | 2 |
Provision for impairment on assets held for sale |  |  | $ 0 |
Dabney Land, East [Member] |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |
Acreage of Land | a | 8 |  |  |
Sales price of properties sold | $ 500,000 |  |  |
Net gain (loss) on sale of undepreciated real estate | $ (100,000) |  |  |
Metropolitan DC [Member] |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |
Number of Properties | property |  | 3 |  |
Impairment of properties held for use |  | $ 27,500,000 |  |
Aggregate carrying value |  | 40,400,000 |  |
Estimated Fair Value Of Impaired Property |  | $ 12,900,000 |  |
Impairment Hold Period |  | 10 years |  |
Residual Capitalization Rates |  | 8.00% |  |
Discount Rates |  | 8.00% |  |

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- Definition Ratio of the net operating income produced by an asset and its capital cost (original prices paid to buy the asset), used as an input to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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