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SEGMENT INFORMATION - Net Operating Income of Company's Reportable Segments (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |
Total revenue | $ 534,852 | $ 580,417 | $ 544,345
Operating expenses | (205,456) | (225,846) | (218,099)
Net operating income (loss) | 329,396 | 354,571 | 326,246
Philadelphia CBD |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenue | 232,028 | 263,769 |
Pennsylvania Suburbs |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenue | 141,613 | 141,084 |
Austin, Texas |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenue | 102,982 | 104,157 |
Metropolitan DC |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenue | 40,223 | 51,498 |
Operating Segments | Philadelphia CBD |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenue | 232,028 | 263,769 | 256,717
Operating expenses | (82,505) | (100,219) | (99,449)
Net operating income (loss) | 149,523 | 163,550 | 157,268
Operating Segments | Pennsylvania Suburbs |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenue | 141,613 | 141,084 | 138,279
Operating expenses | (46,281) | (47,418) | (49,433)
Net operating income (loss) | 95,332 | 93,666 | 88,846
Operating Segments | Austin, Texas |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenue | 102,982 | 104,157 | 38,665
Operating expenses | (39,759) | (38,285) | (16,739)
Net operating income (loss) | 63,223 | 65,872 | 21,926
Operating Segments | Metropolitan DC |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenue | 40,223 | 51,498 | 90,308
Operating expenses | (20,791) | (23,455) | (34,072)
Net operating income (loss) | 19,432 | 28,043 | 56,236
Operating Segments | Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenue | 13,469 | 14,558 | 16,757
Operating expenses | (9,815) | (9,328) | (11,888)
Net operating income (loss) | 3,654 | 5,230 | 4,869
Corporate |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenue | 4,537 | 5,351 | 3,619
Operating expenses | (6,305) | (7,141) | (6,518)
Net operating income (loss) | $ (1,768) | $ (1,790) | $ (2,899)

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- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a),(d)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details
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