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Properties, Net (Details 3) $ in Thousands | Mar. 31, 2017 USD ($) Property | Dec. 31, 2016 USD ($) Property
--- | --- | ---
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Assets held for sale, net | $ 41,391 | $ 94,654
Assets held for sale, net |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Properties, net | 38,018 | 85,402
Deferred rent receivable | 1,546 | 4,241
Intangible assets on real estate acquisitions, net | 338 | 338
Deferred leasing costs, net | 1,109 | 3,636
Lease incentives, net | 380 | 1,037
Assets held for sale, net | $ 41,391 | $ 94,654
Regional Office | White Marsh, Maryland | Assets held for sale, net |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Number of properties | Property | 6 | 8
Defense/Information Technology Locations | Northern Virginia Defense/IT | Assets held for sale, net |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Number of properties | Property |  | 1
Defense/Information Technology Locations | Fort Meade/BW Corridor | Assets held for sale, net |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Number of properties | Property | 1 |

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