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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total revenue |  | $ 134,998 |  | $ 128,438 | $ 405,142 |  | $ 387,149
Operating expenses | [1] | (52,878) |  | (50,701) | (161,929) |  | (152,400)
Net operating income (loss) |  | 82,120 |  | 77,737 | 243,213 |  | 234,749
Philadelphia CBD [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total revenue |  | 64,352 |  |  | 190,478 |  |
Pennsylvania Suburbs [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total revenue |  | 34,745 |  |  | 103,960 |  |
Metropolitan DC [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total revenue |  | 22,754 |  |  | 69,012 |  |
Austin, Texas [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total revenue |  | 8,641 |  |  | 25,474 |  |
Other [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total revenue |  | 3,707 |  |  | 13,187 |  |
Operating Segments [Member] | Philadelphia CBD [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total revenue |  | 64,352 |  | 56,452 | 190,478 |  | 165,352
Operating expenses | [1] | (24,427) |  | (22,010) | (73,559) |  | (64,311)
Net operating income (loss) |  | 39,925 |  | 34,442 | 116,919 |  | 101,041
Operating Segments [Member] | Pennsylvania Suburbs [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total revenue |  | 34,745 |  | 34,861 | 103,960 |  | 105,673
Operating expenses | [1] | (11,937) |  | (11,846) | (37,018) |  | (35,670)
Net operating income (loss) |  | 22,808 |  | 23,015 | 66,942 |  | 70,003
Operating Segments [Member] | Metropolitan DC [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total revenue |  | 22,754 |  | 23,079 | 69,012 |  | 69,190
Operating expenses | [1] | (8,548) |  | (8,500) | (25,699) |  | (26,347)
Net operating income (loss) |  | 14,206 |  | 14,579 | 43,313 |  | 42,843
Operating Segments [Member] | Austin, Texas [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total revenue |  | 8,641 |  | 7,886 | 25,474 |  | 25,772
Operating expenses | [1] | (3,894) |  | (3,929) | (10,812) |  | (11,634)
Net operating income (loss) |  | 4,747 |  | 3,957 | 14,662 |  | 14,138
Operating Segments [Member] | Other [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total revenue |  | 3,707 |  | 3,752 | 13,187 |  | 14,274
Operating expenses | [1] | (2,436) |  | (2,647) | (9,601) |  | (9,083)
Net operating income (loss) |  | 1,271 |  | 1,105 | 3,586 |  | 5,191
Corporate [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total revenue |  | 799 | [2] | 2,408 | 3,031 | [2] | 6,888
Operating expenses | [1] | (1,636) |  | (1,769) | (5,240) |  | (5,355)
Net operating income (loss) |  | $ (837) |  | $ 639 | $ (2,209) |  | $ 1,533
[1] | Includes property operating expenses, real estate taxes and third party management expense.
[2] | Corporate includes intercompany eliminations necessary to reconcile to consolidated Company totals.

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