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Properties, Net (Details 3) $ in Thousands | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) Property
--- | --- | ---
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Assets held for sale, net | $ 42,226 | $ 94,654
Held-for-sale [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Properties, net | 38,670 | 85,402
Deferred rent receivable | 3,237 | 4,241
Intangible assets on real estate acquisitions, net | 0 | 338
Deferred leasing costs, net | 319 | 3,636
Lease incentives, net | 0 | 1,037
Assets held for sale, net | $ 42,226 | $ 94,654
Held-for-sale [Member] | Regional Office and Other [Member] | White Marsh, Maryland [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Number of land parcels held-for-sale | Property |  | 8
Held-for-sale [Member] | Defense/Information Technology Sector [Member] | Northern Virginia Defense/IT [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Number of land parcels held-for-sale | Property |  | 1

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