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SEGMENT INFORMATION - Real Estate Investments, at Cost of Company's Reportable Segments (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Operating properties | $ 3,632,495 | $ 3,617,240
Right of use asset - operating leases, net | 19,505 | 19,664
Construction-in-progress | 236,040 | 218,869
Land held for development | 67,923 | 76,499
Prepaid leasehold interests in land held for development, net | 27,762 | 35,576
Total Core Segments |  |
Segment Reporting Information [Line Items] |  |
Operating properties | 3,259,535 | 3,248,182
Philadelphia CBD |  |
Segment Reporting Information [Line Items] |  |
Operating properties | 1,519,693 | 1,517,801
Pennsylvania Suburbs |  |
Segment Reporting Information [Line Items] |  |
Operating properties | 886,165 | 878,546
Austin, Texas |  |
Segment Reporting Information [Line Items] |  |
Operating properties | 853,677 | 851,835
Other |  |
Segment Reporting Information [Line Items] |  |
Operating properties | $ 372,960 | $ 369,058

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- Definition Carrying amount as of the balance sheet date of expenditures made in advance of when the economic benefit of the cost will be realized, and which will be expensed in future periods with the passage of time or when a triggering event occurs. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(7)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.10) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 + 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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