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Segment Information - Net Operating Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  | $ 153,992 | $ 152,585 | $ 145,648 | $ 150,406 | $ 147,810 | $ 146,558 | $ 150,500 | $ 152,114 | $ 602,631 | $ 596,982 | $ 562,210
Operating expenses | [1] |  |  |  |  |  |  |  |  | (238,087) | (235,965) | (221,769)
Net operating income |  |  |  |  |  |  |  |  |  | 364,544 | 361,017 | 340,441
Operating Segments [Member] | Philadelphia CBD [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 209,298 | 201,809 | 146,081
Operating expenses | [1] |  |  |  |  |  |  |  |  | (77,352) | (75,262) | (55,702)
Net operating income |  |  |  |  |  |  |  |  |  | 131,946 | 126,547 | 90,379
Operating Segments [Member] | Pennsylvania [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 158,398 | 160,630 | 153,426
Operating expenses | [1] |  |  |  |  |  |  |  |  | (57,319) | (55,062) | (54,506)
Net operating income |  |  |  |  |  |  |  |  |  | 101,079 | 105,568 | 98,920
Operating Segments [Member] | Metropolitan DC [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 110,657 | 113,834 | 116,048
Operating expenses | [1] |  |  |  |  |  |  |  |  | (44,294) | (43,399) | (42,641)
Net operating income |  |  |  |  |  |  |  |  |  | 66,363 | 70,435 | 73,407
Operating Segments [Member] | New Jersey/ Delaware [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 47,726 | 60,403 | 60,262
Operating expenses | [1] |  |  |  |  |  |  |  |  | (26,854) | (31,650) | (29,981)
Net operating income |  |  |  |  |  |  |  |  |  | 20,872 | 28,753 | 30,281
Operating Segments [Member] | Richmond, Virginia [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 36,486 | 34,180 | 35,058
Operating expenses | [1] |  |  |  |  |  |  |  |  | (15,073) | (15,399) | (14,916)
Net operating income |  |  |  |  |  |  |  |  |  | 21,413 | 18,781 | 20,142
Operating Segments [Member] | California [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 14,587 | 19,388 | 18,369
Operating expenses | [1] |  |  |  |  |  |  |  |  | (7,677) | (10,165) | (9,411)
Net operating income |  |  |  |  |  |  |  |  |  | 6,910 | 9,223 | 8,958
Operating Segments [Member] | Austin, Texas [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total revenue | [2] |  |  |  |  |  |  |  |  | 20,910 | 5,610 | 31,451
Operating expenses | [1],[2] |  |  |  |  |  |  |  |  | (8,010) | (3,223) | (13,298)
Net operating income | [2] |  |  |  |  |  |  |  |  | 12,900 | 2,387 | 18,153
Corporate [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 4,569 | 1,128 | 1,515
Operating expenses | [1] |  |  |  |  |  |  |  |  | (1,508) | (1,805) | (1,314)
Net operating income |  |  |  |  |  |  |  |  |  | $ 3,061 | $ (677) | $ 201
[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, 2015. See Note 3, "Real Estate Investments," for further information regarding these transactions.

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