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Segment Information - Real Estate Investments, at Cost of Company's Reportable Segments (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Segment Reporting Information [Line Items] |  |  |
Operating properties |  | $ 3,769,067 | $ 3,586,295
Assets held for sale - real estate investments | [1],[2] | 47,291 | 73,591
Operating properties |  | 3,816,358 | 3,659,886
Construction-in-progress |  | 127,141 | 297,462
Land held for development |  | 120,696 | 150,970
Philadelphia CBD [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating properties |  | 1,591,828 | 1,320,974
Pennsylvania Suburbs [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating properties | [3] | 966,128 | 1,005,446
Metropolitan DC [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating properties |  | 976,286 | 975,987
Austin, Texas [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating properties |  | 146,859 | 146,794
Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating properties |  | $ 87,966 | $ 137,094
[1] | Real estate investments related to assets held for sale above represents gross real estate assets and does not include accumulated depreciation, land held for development or other assets on the balance sheet of the property held for sale. See Note 3, “Real Estate Investments,” for further information.
[2] | Real estate investments related to assets held for sale above represents gross real estate assets and does not include accumulated depreciation, land held for development or other assets on the balance sheet of the property held for sale. See “Held for Sale” below in this Note 3.
[3] | As of September 30, 2017, the Company categorized six office properties in its Pennsylvania Suburbs segment as held for sale in accordance with applicable accounting standards for long lived assets. See Note 3, “Real Estate Investments,” for further information.

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