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SEGMENT INFORMATION - Real Estate Investments, at Cost of Company's Reportable Segments (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Segment Reporting Information [Line Items] |  |  |
Operating properties | $ 3,474,109 | $ 4,006,459 | $ 3,951,719
Right of use asset - operating leases, net | 20,977 | 21,656 |
Construction-in-progress | 210,311 | 180,718 |
Land held for development | 117,984 | 96,124 |
Prepaid leasehold interests in land held for development, net | 39,185 | 39,592 |
Philadelphia CBD |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating properties | 1,433,927 | 1,726,299 |
Pennsylvania Suburbs |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating properties | 871,530 | 1,003,890 |
Austin, Texas |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating properties | 728,741 | 721,255 |
Metropolitan DC |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating properties | 352,794 | 468,035 |
Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating properties | $ 87,117 | $ 86,980 |

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- Definition Carrying amount of land available for development. + 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.(a),1(d)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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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://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 http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: 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 http://asc.fasb.org/extlink&oid=120400017&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 http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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