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Segment Information - Net Operating Income of Company's Reportable Segments (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting Information [Line Items] |  |  |
Total revenue |  | $ 136,358 | $ 130,920
Operating expenses | [1] | (56,504) | (51,081)
Net operating income (loss) |  | 79,854 | 79,839
Philadelphia CBD [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenue |  | 62,602 |
Pennsylvania Suburbs [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenue |  | 34,882 |
Metropolitan DC [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenue |  | 23,059 |
Austin, Texas [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenue |  | 8,364 |
Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenue |  | 6,141 |
Operating Segments [Member] | Philadelphia CBD [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenue |  | 62,602 | 54,449
Operating expenses | [1] | (24,327) | (20,837)
Net operating income (loss) |  | 38,275 | 33,612
Operating Segments [Member] | Pennsylvania Suburbs [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenue |  | 34,882 | 35,655
Operating expenses | [1] | (12,964) | (12,584)
Net operating income (loss) |  | 21,918 | 23,071
Operating Segments [Member] | Metropolitan DC [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenue |  | 23,059 | 23,362
Operating expenses | [1] | (8,759) | (9,383)
Net operating income (loss) |  | 14,300 | 13,979
Operating Segments [Member] | Austin, Texas [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenue |  | 8,364 | 9,123
Operating expenses | [1] | (3,523) | (3,573)
Net operating income (loss) |  | 4,841 | 5,550
Operating Segments [Member] | Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenue |  | 6,141 | 6,362
Operating expenses | [1] | (4,965) | (3,856)
Net operating income (loss) |  | 1,176 | 2,506
Corporate [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenue |  | 1,310 | 1,969
Operating expenses | [1] | (1,966) | (848)
Net operating income (loss) |  | $ (656) | $ 1,121
[1] | Includes property operating expenses, real estate taxes and third party management expense.

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- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a),(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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