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Segment Information - Net Operating Income of Company's Reportable Segments (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Segment Reporting Information [Line Items] |  |
Total revenue | $ 120,769 | $ 145,088
Operating expenses | (46,674) | (56,910)
Net operating income (loss) | 74,095 | 88,178
Operating Segments | Philadelphia CBD |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 51,227 | 65,915
Operating expenses | (17,411) | (24,198)
Net operating income (loss) | 33,816 | 41,717
Operating Segments | Pennsylvania Suburbs |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 31,740 | 37,237
Operating expenses | (10,694) | (12,678)
Net operating income (loss) | 21,046 | 24,559
Operating Segments | Austin, Texas |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 26,175 | 26,581
Operating expenses | (9,720) | (10,145)
Net operating income (loss) | 16,455 | 16,436
Operating Segments | Metropolitan Washington, D.C. |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 4,675 | 10,754
Operating expenses | (4,199) | (5,512)
Net operating income (loss) | 476 | 5,242
Operating Segments | Other |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 3,213 | 3,652
Operating expenses | (2,282) | (2,693)
Net operating income (loss) | 931 | 959
Corporate |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 3,739 | 949
Operating expenses | (2,368) | (1,684)
Net operating income (loss) | $ 1,371 | $ (735)

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