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SEGMENT INFORMATION - Net Operating Income of Company's Reportable Segments (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Segment Reporting Information [Line Items] |  |  |
Total revenue | $ 505,517 | $ 514,651 | $ 506,100
Operating expenses | (187,330) | (189,947) | (194,401)
Net operating income | 318,187 | 324,704 | 311,699
Operating Segments | Philadelphia CBD |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenue | 225,986 | 230,933 | 220,875
Operating expenses | (81,061) | (79,579) | (79,827)
Net operating income | 144,925 | 151,354 | 141,048
Operating Segments | Pennsylvania Suburbs |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenue | 125,011 | 129,300 | 128,940
Operating expenses | (38,822) | (39,584) | (41,814)
Net operating income | 86,189 | 89,716 | 87,126
Operating Segments | Austin, Texas |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenue | 87,208 | 95,505 | 96,329
Operating expenses | (34,033) | (38,453) | (41,141)
Net operating income | 53,175 | 57,052 | 55,188
Operating Segments | Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenue | 42,139 | 39,306 | 36,610
Operating expenses | (20,698) | (21,134) | (21,165)
Net operating income | 21,441 | 18,172 | 15,445
Corporate |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenue | 25,173 | 19,607 | 23,346
Operating expenses | (12,716) | (11,197) | (10,454)
Net operating income | $ 12,457 | $ 8,410 | $ 12,892

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