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SEGMENT INFORMATION - Real Estate Investments, at Cost of Company's Reportable Segments (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Operating properties | $ 3,694,633 | $ 3,617,240
Right of use asset - operating leases, net | 19,188 | 19,664
Construction-in-progress | 143,929 | 218,869
Land held for development | 76,058 | 76,499
Prepaid leasehold interests in land held for development, net | 27,762 | 35,576
Continuing Operations |  |
Segment Reporting Information [Line Items] |  |
Operating properties | 3,696,066 | 3,617,240
Total Core Segments | Continuing Operations |  |
Segment Reporting Information [Line Items] |  |
Operating properties | 3,235,523 | 3,248,182
Philadelphia CBD | Continuing Operations |  |
Segment Reporting Information [Line Items] |  |
Operating properties | 1,521,723 | 1,517,801
Pennsylvania Suburbs | Continuing Operations |  |
Segment Reporting Information [Line Items] |  |
Operating properties | 915,659 | 878,546
Austin, Texas | Continuing Operations |  |
Segment Reporting Information [Line Items] |  |
Operating properties | 798,141 | 851,835
Other | Continuing Operations |  |
Segment Reporting Information [Line Items] |  |
Operating properties | $ 460,543 | $ 369,058

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- Definition The current amount of expenditures for a real estate project that has not yet been completed. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-1 + Details
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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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