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Properties, net (Details 3) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2014 USD ($) | Dec. 31, 2016 USD ($) Property | Dec. 31, 2015 USD ($) Property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Assets held for sale, net |  | $ 94,654 | $ 96,782
Greater Philadelphia [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Depreciation expense resulting from useful life change | $ 12,900 |  |
Held-for-sale [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Properties, net |  | 85,402 | 90,188
Deferred rent receivable |  | 4,241 | 2,891
Intangible assets on real estate acquisitions, net |  | 338 | 1,591
Deferred leasing costs, net |  | 3,636 | 1,391
Lease incentives, net |  | 1,037 | 721
Assets held for sale, net |  | $ 94,654 | $ 96,782
Held-for-sale [Member] | Regional Office [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 | 13
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 |
Held-for-sale [Member] | Other Segments [Member] | San Antonio [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Number of land parcels held-for-sale | Property |  |  | 2

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