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Properties, net (Details 3) $ in Thousands	Jun. 30, 2015 USD ($) Property	Dec. 31, 2014 USD ($) Property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets held for sale, net	$ 77,013	$ 14,339
Greater Baltimore | Assets Held For Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties held-for-sale | Property		2
Assets held for sale, net		$ 14,300
2015 Assets Held For Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Properties, net	73,174
Deferred rent receivable	1,683
Intangible assets on real estate acquisitions, net	1,017
Deferred leasing costs, net	977
Lease incentives, net	162
Assets held for sale, net	$ 77,013
2015 Assets Held For Sale | Greater Baltimore
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties held-for-sale | Property	6
2015 Assets Held For Sale | Northern Virginia
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties held-for-sale | Property	1

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Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 205



-SubTopic 20



-Section 45



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