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SEGMENT INFORMATION - Real Estate Investments, at Cost of Company's Reportable Segments (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Operating properties | $ 3,587,083 | $ 3,472,602
Right of use asset - operating leases, net | 19,826 | 20,313
Construction-in-progress | 227,231 | 277,237
Land held for development | 74,272 | 114,604
Prepaid leasehold interests in land held for development, net | 35,576 | 27,762
Continuing Operations |  |
Segment Reporting Information [Line Items] |  |
Operating properties | 3,608,133 | 3,472,602
Discontinued Operations |  |
Segment Reporting Information [Line Items] |  |
Operating properties | 21,050 | 0
Philadelphia CBD |  |
Segment Reporting Information [Line Items] |  |
Operating properties | 1,515,324 | 1,460,510
Pennsylvania Suburbs |  |
Segment Reporting Information [Line Items] |  |
Operating properties | 852,658 | 866,223
Austin, Texas |  |
Segment Reporting Information [Line Items] |  |
Operating properties | 843,213 | 778,145
Metropolitan Washington, D.C. |  |
Segment Reporting Information [Line Items] |  |
Operating properties | 289,904 | 280,921
Other |  |
Segment Reporting Information [Line Items] |  |
Operating properties | $ 85,984 | $ 86,803

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 + Details
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