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SEGMENT INFORMATION - Net Operating Income of Company's Reportable Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue | $ 147,039 | $ 145,331 | $ 144,151 | $ 143,896 | $ 139,203 | $ 134,998 | $ 133,786 | $ 136,358 | $ 580,417 | $ 544,345 | $ 520,493
Operating expenses |  |  |  |  |  |  |  |  | (225,846) | (218,099) | (206,075)
Net operating income (loss) |  |  |  |  |  |  |  |  | 354,571 | 326,246 | 314,418
Philadelphia CBD |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 263,769 |  |
Pennsylvania Suburbs |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 141,084 |  |
Austin, Texas |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 104,157 |  |
Metropolitan DC |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 51,498 |  |
Operating Segments | Philadelphia CBD |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 263,769 | 256,717 | 226,673
Operating expenses |  |  |  |  |  |  |  |  | (100,219) | (99,449) | (88,818)
Net operating income (loss) |  |  |  |  |  |  |  |  | 163,550 | 157,268 | 137,855
Operating Segments | Pennsylvania Suburbs |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 141,084 | 138,279 | 139,785
Operating expenses |  |  |  |  |  |  |  |  | (47,418) | (49,433) | (47,845)
Net operating income (loss) |  |  |  |  |  |  |  |  | 93,666 | 88,846 | 91,940
Operating Segments | Austin, Texas |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 104,157 | 38,665 | 34,301
Operating expenses |  |  |  |  |  |  |  |  | (38,285) | (16,739) | (15,456)
Net operating income (loss) |  |  |  |  |  |  |  |  | 65,872 | 21,926 | 18,845
Operating Segments | Metropolitan DC |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 51,498 | 90,308 | 92,024
Operating expenses |  |  |  |  |  |  |  |  | (23,455) | (34,072) | (35,014)
Net operating income (loss) |  |  |  |  |  |  |  |  | 28,043 | 56,236 | 57,010
Operating Segments | Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 14,558 | 16,757 | 18,347
Operating expenses |  |  |  |  |  |  |  |  | (9,328) | (11,888) | (11,749)
Net operating income (loss) |  |  |  |  |  |  |  |  | 5,230 | 4,869 | 6,598
Corporate |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 5,351 | 3,619 | 9,363
Operating expenses |  |  |  |  |  |  |  |  | (7,141) | (6,518) | (7,193)
Net operating income (loss) |  |  |  |  |  |  |  |  | $ (1,790) | $ (2,899) | $ 2,170

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