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Segment Information - Net Operating Income of Company's Reportable Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue |  | $ 127,791 | $ 127,181 | $ 258,711 | $ 263,683
Operating expenses | [1] | (50,618) | (50,221) | (101,699) | (104,996)
Net operating income (loss) |  | 77,173 | 76,960 | 157,012 | 158,687
Operating Segments [Member] | Philadelphia CBD [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue |  | 54,451 | 48,082 | 108,900 | 97,752
Operating expenses | [1] | (21,464) | (19,775) | (42,301) | (39,031)
Net operating income (loss) |  | 32,987 | 28,307 | 66,599 | 58,721
Operating Segments [Member] | Pennsylvania Suburbs [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue |  | 35,157 | 35,102 | 70,812 | 72,208
Operating expenses | [1] | (11,240) | (12,580) | (23,824) | (25,735)
Net operating income (loss) |  | 23,917 | 22,522 | 46,988 | 46,473
Operating Segments [Member] | Metropolitan DC [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue |  | 22,749 | 25,291 | 46,111 | 52,630
Operating expenses | [1] | (8,464) | (8,768) | (17,847) | (19,667)
Net operating income (loss) |  | 14,285 | 16,523 | 28,264 | 32,963
Operating Segments [Member] | Austin, Texas [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue |  | 8,763 | 7,850 | 17,886 | 16,397
Operating expenses | [1] | (4,132) | (2,911) | (7,705) | (6,166)
Net operating income (loss) |  | 4,631 | 4,939 | 10,181 | 10,231
Operating Segments [Member] | Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue |  | 4,160 | 9,062 | 10,522 | 21,802
Operating expenses | [1] | (2,580) | (5,074) | (6,436) | (12,676)
Net operating income (loss) |  | 1,580 | 3,988 | 4,086 | 9,126
Corporate [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue |  | 2,511 | 1,794 | 4,480 | 2,894
Operating expenses | [1] | (2,738) | (1,113) | (3,586) | (1,721)
Net operating income (loss) |  | $ (227) | $ 681 | $ 894 | $ 1,173
[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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