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Segment Information - Net Operating Income of Company's Reportable Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | [1] | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  | $ 139,203 | $ 134,998 | $ 133,786 | $ 136,358 | $ 133,344 | $ 128,438 | $ 127,791 | $ 130,920 | $ 544,345 |  | $ 520,493 | $ 525,463
Operating expenses | [2] |  |  |  |  |  |  |  |  | (218,023) |  | (205,999) | (209,448)
Net operating income (loss) |  |  |  |  |  |  |  |  |  | 326,322 |  | 314,494 | 316,015
Philadelphia CBD [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 256,717 |  |  |
Pennsylvania Suburbs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 138,279 |  |  |
Metropolitan DC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 90,308 |  |  |
Austin, Texas [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 38,665 |  |  |
Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 16,757 |  |  |
Operating Segments [Member] | Philadelphia CBD [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 256,717 |  | 226,673 | 200,245
Operating expenses | [2] |  |  |  |  |  |  |  |  | (99,449) |  | (88,818) | (78,708)
Net operating income (loss) |  |  |  |  |  |  |  |  |  | 157,268 |  | 137,855 | 121,537
Operating Segments [Member] | Pennsylvania Suburbs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 138,279 |  | 139,785 | 144,338
Operating expenses | [2] |  |  |  |  |  |  |  |  | (49,357) |  | (47,769) | (49,208)
Net operating income (loss) |  |  |  |  |  |  |  |  |  | 88,922 |  | 92,016 | 95,130
Operating Segments [Member] | Metropolitan DC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 90,308 |  | 92,024 | 99,781
Operating expenses | [2] |  |  |  |  |  |  |  |  | (34,072) |  | (35,014) | (39,036)
Net operating income (loss) |  |  |  |  |  |  |  |  |  | 56,236 |  | 57,010 | 60,745
Operating Segments [Member] | Austin, Texas [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 38,665 |  | 34,301 | 34,585
Operating expenses | [2] |  |  |  |  |  |  |  |  | (16,739) |  | (15,456) | (13,222)
Net operating income (loss) |  |  |  |  |  |  |  |  |  | 21,926 |  | 18,845 | 21,363
Operating Segments [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 16,757 |  | 18,347 | 39,359
Operating expenses | [2] |  |  |  |  |  |  |  |  | (11,888) |  | (11,749) | (23,204)
Net operating income (loss) |  |  |  |  |  |  |  |  |  | 4,869 |  | 6,598 | 16,155
Corporate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 3,619 | [3] | 9,363 | 7,155
Operating expenses | [2] |  |  |  |  |  |  |  |  | (6,518) |  | (7,193) | (6,070)
Net operating income (loss) |  |  |  |  |  |  |  |  |  | $ (2,899) |  | $ 2,170 | $ 1,085
[1] | The increase in fourth quarter revenues primarily relates to the acquisition of the Austin Portfolio, located in Austin, Texas, on December 11, 2018. See Note 3, “Real Estate Investments,” for further information on this transaction.
[2] | Includes property operating expense, real estate taxes and third party management expense.
[3] | Corporate includes intercompany eliminations necessary to reconcile to consolidated Company totals.

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