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SEGMENT INFORMATION - Real Estate Investments, at Cost of Company's Reportable Segments (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Segment Reporting Information [Line Items] |  |  |
Operating properties | $ 3,542,232 | $ 3,617,240 | $ 3,472,602
Right of use asset - operating leases, net | 19,031 | 19,664 |
Construction-in-progress | 135,529 | 218,869 |
Land held for development | 82,510 | 76,499 |
Prepaid leasehold interests in land held for development, net | 27,762 | 35,576 |
Total Core Segments | Continuing Operations |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating properties | 3,237,096 | 3,248,182 |
Philadelphia CBD | Continuing Operations |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating properties | 1,534,893 | 1,517,801 |
Pennsylvania Suburbs | Continuing Operations |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating properties | 900,230 | 878,546 |
Austin, Texas | Continuing Operations |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating properties | 801,973 | 851,835 |
Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating properties | $ 305,136 | $ 369,058 |

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- Definition Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(d)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 + Details
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