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SEGMENT INFORMATION - Net Operating Income of Company's Reportable Segments (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Segment Reporting Information [Line Items] |  |  |
Total revenue | $ 514,651 | $ 506,100 | $ 486,819
Operating expenses | (189,947) | (194,401) | (188,311)
Net operating income | 324,704 | 311,699 | 298,508
Philadelphia CBD |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenue |  | 220,875 |
Pennsylvania Suburbs |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenue |  | 128,940 |
Austin, Texas |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenue |  | 96,329 |
Operating Segments | Philadelphia CBD |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenue | 230,933 | 220,876 | 207,858
Operating expenses | (79,579) | (79,827) | (73,695)
Net operating income | 151,354 | 141,049 | 134,163
Operating Segments | Pennsylvania Suburbs |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenue | 129,300 | 128,940 | 124,566
Operating expenses | (39,584) | (41,814) | (40,011)
Net operating income | 89,716 | 87,126 | 84,555
Operating Segments | Austin, Texas |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenue | 95,505 | 96,328 | 101,680
Operating expenses | (38,453) | (41,141) | (39,374)
Net operating income | 57,052 | 55,187 | 62,306
Operating Segments | Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenue | 39,306 | 36,610 | 33,880
Operating expenses | (21,134) | (21,165) | (25,226)
Net operating income | 18,172 | 15,445 | 8,654
Corporate |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenue | 19,607 | 23,346 | 18,835
Operating expenses | (11,197) | (10,454) | (10,005)
Net operating income | $ 8,410 | $ 12,892 | $ 8,830

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