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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, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  | $ 132,086 | $ 129,694 | $ 127,181 | $ 136,502 | $ 153,992 | $ 152,585 | $ 145,648 | $ 150,406 | $ 525,463 | $ 602,631 | $ 596,982
Operating expenses | [1] |  |  |  |  |  |  |  |  | (209,448) | (238,087) | (235,965)
Net operating income |  |  |  |  |  |  |  |  |  | 316,015 | 364,544 | 361,017
Operating Segments [Member] | Philadelphia CBD [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 200,245 | 209,298 | 201,809
Operating expenses | [1] |  |  |  |  |  |  |  |  | (78,708) | (77,352) | (75,262)
Net operating income |  |  |  |  |  |  |  |  |  | 121,537 | 131,946 | 126,547
Operating Segments [Member] | Pennsylvania Suburbs [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 144,338 | 158,398 | 160,630
Operating expenses | [1] |  |  |  |  |  |  |  |  | (49,208) | (57,319) | (55,062)
Net operating income |  |  |  |  |  |  |  |  |  | 95,130 | 101,079 | 105,568
Operating Segments [Member] | Metropolitan DC [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 99,781 | 110,657 | 113,834
Operating expenses | [1] |  |  |  |  |  |  |  |  | (39,036) | (44,294) | (43,399)
Net operating income |  |  |  |  |  |  |  |  |  | 60,745 | 66,363 | 70,435
Operating Segments [Member] | Austin, Texas [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total revenue | [2] |  |  |  |  |  |  |  |  | 34,585 | 20,910 | 5,610
Operating expenses | [1],[2] |  |  |  |  |  |  |  |  | (13,222) | (8,010) | (3,223)
Net operating income | [2] |  |  |  |  |  |  |  |  | 21,363 | 12,900 | 2,387
Operating Segments [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 39,359 | 98,799 | 113,971
Operating expenses | [1] |  |  |  |  |  |  |  |  | (23,204) | (49,604) | (57,214)
Net operating income |  |  |  |  |  |  |  |  |  | 16,155 | 49,195 | 56,757
Corporate [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 7,155 | 4,569 | 1,128
Operating expenses | [1] |  |  |  |  |  |  |  |  | (6,070) | (1,508) | (1,805)
Net operating income |  |  |  |  |  |  |  |  |  | $ 1,085 | $ 3,061 | $ (677)
[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% of the common interest in Broadmoor Austin Associates. As such, the Company has seven wholly owned properties in its Austin, Texas business segment at December 31, 2016. In addition, net operating income for the years ended December 31, 2016 and 2015 includes management fees and related expenses for services provided by the Company to the Austin Venture. See Note 3, "Real Estate Investments," for further information regarding these transactions.

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