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Schedule III - Real Estate and Accumulated Depreciation (Reconciliation of Real Estate Investments and Accumulated Depreciation) (Parentheticals) (Details) | 12 Months Ended
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Dec. 31, 2018 USD ($) Parcel | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward] |  |  |  |
Balance at the Beginning of the Year |  | $ 3,832,348,000 | $ 3,659,886,000 | $ 4,487,588,000
Additions: |  |  |  |
Acquisitions |  | 509,654,000 | 62,586,000 | 0
Capital expenditures and assets placed into service |  | 129,274,000 | 356,857,000 | 213,996,000
Less: |  |  |  |
Dispositions/impairments/placed into redevelopment |  | (469,441,000) | (189,395,000) | (962,676,000)
Retirements |  | (48,516,000) | (57,586,000) | (79,022,000)
Balance at the end of the year |  | 3,953,319,000 | 3,832,348,000 | 3,659,886,000
Assets held for sale | [1] | 0 | 0 | (73,591,000)
Operating properties |  | 3,953,319,000 | 3,832,348,000 | 3,586,295,000
Tax Basis of Assets, Cost for Income Tax Purposes |  | 3,300,000,000 | 3,100,000,000 |
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] |  |  |  |
Balance at the beginning of the year |  | 895,091,000 | 885,392,000 | 1,080,616,000
Real Estate Accumulated Depreciation Additions [Abstract] |  |  |  |
Depreciation expense |  | 135,473,000 | 135,822,000 | 131,859,000
Real Estate Accumulated Depreciation Less Dispositions [Abstract] |  |  |  |
Dispositions/impairments/placed into redevelopment |  | (117,589,000) | (74,178,000) | (250,110,000)
Retirements |  | (47,513,000) | (51,945,000) | (76,973,000)
Balance at the end of the year |  | 865,462,000 | 895,091,000 | 885,392,000
Assets held for sale |  | 0 | 0 | (32,916,000)
Real Estate Investment Property, Accumulated Depreciation |  | $ 865,462,000 | 895,091,000 |
Land Parcel One [Member] |  |  |  |
Real Estate Accumulated Depreciation Less Dispositions [Abstract] |  |  |  |
Lease agreement term |  | 99 years |  |
Land Parcel Two [Member] |  |  |  |
Real Estate Accumulated Depreciation Less Dispositions [Abstract] |  |  |  |
Lease agreement term |  | 99 years |  |
Leashold Interest Land [Member] |  |  |  |
Real Estate Accumulated Depreciation Less Dispositions [Abstract] |  |  |  |
Number of Parcels | Parcel |  | 2 |  |
Philadelphia CBD [Member] | 618-634 Market Street [Member] |  |  |  |
Less: |  |  |  |
Balance at the end of the year |  | $ 21,108,000.00 |  |
Real Estate Accumulated Depreciation Less Dispositions [Abstract] |  |  |  |
Balance at the end of the year |  | $ 4,601,000 |  |
Useful life |  | 5 years |  |
Philadelphia CBD [Member] | 618-634 Market Street [Member] | Parking Structure [Member] |  |  |  |
Real Estate Accumulated Depreciation Less Dispositions [Abstract] |  |  |  |
Useful life |  | 5 years |  |
Accumulated Depreciation, including HFS [Member] |  |  |  |
Real Estate Accumulated Depreciation Less Dispositions [Abstract] |  |  |  |
Real Estate Investment Property, Accumulated Depreciation |  | $ 865,462,000 | $ 895,091,000 | $ 852,476,000
[1] | As of December 31, 2016, three office properties in the Metropolitan Washington, D.C. segment and two office properties in the Other segment were classified as held for sale in accordance with applicable accounting standards for long-lived assets. See the “2016” section of Note 3, “Real Estate Investments,” for further information.

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