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Segment Information - Net Operating Income of Company's Reportable Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue |  | $ 128,438 | $ 129,694 | $ 387,149 | $ 393,377
Operating expenses | [1] | (50,701) | (51,317) | (152,400) | (156,313)
Net operating income (loss) |  | 77,737 | 78,377 | 234,749 | 237,064
Operating Segments [Member] | Philadelphia CBD [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue |  | 56,452 | 50,744 | 165,352 | 148,496
Operating expenses | [1] | (22,010) | (19,071) | (64,311) | (58,102)
Net operating income (loss) |  | 34,442 | 31,673 | 101,041 | 90,394
Operating Segments [Member] | Pennsylvania Suburbs [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue |  | 34,861 | 35,763 | 105,673 | 107,971
Operating expenses | [1] | (11,846) | (11,247) | (35,670) | (36,982)
Net operating income (loss) |  | 23,015 | 24,516 | 70,003 | 70,989
Operating Segments [Member] | Metropolitan DC [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue |  | 23,079 | 24,251 | 69,190 | 76,881
Operating expenses | [1] | (8,500) | (9,900) | (26,347) | (29,567)
Net operating income (loss) |  | 14,579 | 14,351 | 42,843 | 47,314
Operating Segments [Member] | Austin, Texas [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue |  | 7,886 | 8,726 | 25,772 | 25,123
Operating expenses | [1] | (3,929) | (3,523) | (11,634) | (9,689)
Net operating income (loss) |  | 3,957 | 5,203 | 14,138 | 15,434
Operating Segments [Member] | Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue |  | 3,752 | 8,526 | 14,274 | 30,328
Operating expenses | [1] | (2,647) | (4,837) | (9,083) | (17,513)
Net operating income (loss) |  | 1,105 | 3,689 | 5,191 | 12,815
Corporate [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue |  | 2,408 | 1,684 | 6,888 | 4,578
Operating expenses | [1] | (1,769) | (2,739) | (5,355) | (4,460)
Net operating income (loss) |  | $ 639 | $ (1,055) | $ 1,533 | $ 118
[1] | Includes property operating expense, 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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