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SEGMENT INFORMATION - Real Estate Investments, at Cost of Company's Reportable Segments (Details) $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 29, 2018 USD ($) | Dec. 31, 2019 USD ($) a | Dec. 31, 2018 USD ($) a | Dec. 31, 2017 USD ($) a
Segment Reporting Information [Line Items] |  |  |  |
Operating properties |  | $ 4,006,459 | $ 3,951,719 | $ 3,830,824
Right of use asset - operating leases, net |  | 21,656 | 0 | 0
Construction-in-progress |  | 180,718 | 150,263 | 121,188
Land held for development |  | 96,124 | 86,401 | 98,242
Prepaid leasehold interests in land held for development, net |  | $ 39,592 | $ 39,999 | $ 0
Held for Sale Properties Included in Continuing Operations | Land Held For Development |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Acres | a |  | 35.2 | 37.9 | 13.1
3025 JFK Boulevard |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Prepaid leasehold interests in land held for development, net | $ 15,000 |  |  |
Lease agreement term | 99 years | 99 years |  |
Philadelphia CBD |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating properties |  | $ 1,726,299 | $ 1,670,388 | $ 1,643,296
Pennsylvania Suburbs |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating properties |  | 1,003,890 | 1,002,937 | 957,272
Austin, Texas |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating properties |  | 721,255 | 667,698 | 163,653
Metropolitan DC |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating properties |  | 468,035 | 524,190 | 978,257
Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating properties |  | $ 86,980 | $ 86,506 | $ 88,346

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