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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, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue |  | $ 127,181 | $ 145,648 | $ 263,683 | $ 296,054
Operating expenses | [1] | (50,221) | (56,349) | (104,996) | (117,047)
Net operating income |  | 76,960 | 89,299 | 158,687 | 179,007
Operating Segments [Member] | Philadelphia CBD [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue |  | 48,082 | 52,420 | 97,752 | 105,393
Operating expenses | [1] | (19,775) | (19,448) | (39,031) | (37,838)
Net operating income |  | 28,307 | 32,972 | 58,721 | 67,555
Operating Segments [Member] | Pennsylvania Suburbs [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue |  | 35,102 | 39,010 | 72,208 | 78,900
Operating expenses | [1] | (12,580) | (12,856) | (25,735) | (27,441)
Net operating income |  | 22,522 | 26,154 | 46,473 | 51,459
Operating Segments [Member] | Metropolitan DC [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue |  | 25,291 | 26,953 | 52,630 | 54,359
Operating expenses | [1] | (8,768) | (10,544) | (19,667) | (22,404)
Net operating income |  | 16,523 | 16,409 | 32,963 | 31,955
Operating Segments [Member] | Austin, Texas [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue | [2] | 7,850 | 2,533 | 16,397 | 3,467
Operating expenses | [1],[2] | (2,911) | (1,498) | (6,166) | (2,369)
Net operating income | [2] | 4,939 | 1,035 | 10,231 | 1,098
Operating Segments [Member] | Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue | [3] | 9,062 | 24,074 | 21,802 | 51,853
Operating expenses | [1],[3] | (5,074) | (11,407) | (12,676) | (25,985)
Net operating income | [3] | 3,988 | 12,667 | 9,126 | 25,868
Corporate [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenue |  | 1,794 | 658 | 2,894 | 2,082
Operating expenses | [1] | (1,113) | (596) | (1,721) | (1,010)
Net operating income |  | $ 681 | $ 62 | $ 1,173 | $ 1,072
[1] | Includes property operating expense, real estate taxes and third party management expense.
[2] | On June 22, 2015 the Company acquired the remaining 50.0% interest in Broadmoor Austin Associates. As such, the Company has seven wholly owned properties in its Austin, Texas business segment at June 30, 2016. In addition, net operating income for the three and six months ended June 30, 2016 and 2015 includes management fees and related expenses for services provided by the Company to the Austin Venture.
[3] | See footnote (e) to the “Real estate investments, at cost” table above for further information regarding this segment.

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