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Segment Information - Net Operating Income of Company's Reportable Segments (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Segment Reporting Information [Line Items] |  |
Total revenue | $ 145,088 | $ 143,896
Operating expenses | (56,910) | (57,400)
Net operating income (loss) | 88,178 | 86,496
Operating Segments | Philadelphia CBD |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 65,915 | 65,798
Operating expenses | (24,198) | (25,185)
Net operating income (loss) | 41,717 | 40,613
Operating Segments | Pennsylvania Suburbs |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 37,237 | 35,627
Operating expenses | (12,678) | (12,991)
Net operating income (loss) | 24,559 | 22,636
Operating Segments | Austin, Texas |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 26,581 | 24,766
Operating expenses | (10,145) | (9,076)
Net operating income (loss) | 16,436 | 15,690
Operating Segments | Metropolitan Washington, D.C. |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 10,754 | 13,520
Operating expenses | (5,512) | (6,204)
Net operating income (loss) | 5,242 | 7,316
Operating Segments | Other |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 3,652 | 3,182
Operating expenses | (2,693) | (2,145)
Net operating income (loss) | 959 | 1,037
Corporate |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 949 | 1,003
Operating expenses | (1,684) | (1,799)
Net operating income (loss) | $ (735) | $ (796)

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