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Segment Information (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 Rental and Other Revenues | $ 179,417 | $ 180,185 | $ 538,647 | $ 526,876
Total Net Operating Income | 118,264 | 118,951 | 358,399 | 349,392
Reconciliation to income before disposition of investment properties and activity in unconsolidated affiliates: |  |  |  |
Depreciation and amortization | (57,661) | (56,973) | (171,923) | (168,934)
Impairments of real estate assets | 0 | (1,445) | 0 | (1,445)
General and administrative expenses | (9,551) | (9,247) | (30,869) | (29,787)
Interest expense | (17,437) | (17,191) | (53,705) | (51,208)
Other income | 818 | 558 | 1,735 | 2,632
Income before disposition of investment properties and activity in unconsolidated affiliates | 34,433 | 34,653 | 103,637 | 100,650
Total Office Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Rental and Other Revenues | 176,260 | 177,021 | 529,073 | 517,079
Total Net Operating Income | 115,928 | 116,637 | 351,321 | 342,488
Office Atlanta, GA [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Rental and Other Revenues | 35,375 | 36,471 | 105,635 | 106,027
Total Net Operating Income | 21,443 | 23,600 | 65,721 | 68,150
Office Greensboro, NC [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Rental and Other Revenues | 5,349 | 5,370 | 16,753 | 15,956
Total Net Operating Income | 3,372 | 3,367 | 10,817 | 10,116
Office Memphis, TN [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Rental and Other Revenues | 10,121 | 11,459 | 30,228 | 35,077
Total Net Operating Income | 6,471 | 6,930 | 19,289 | 21,474
Office Nashville, TN [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Rental and Other Revenues | 29,927 | 28,945 | 91,319 | 81,471
Total Net Operating Income | 21,896 | 21,000 | 66,306 | 59,250
Office Orlando, FL [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Rental and Other Revenues | 13,352 | 13,309 | 40,103 | 38,183
Total Net Operating Income | 8,195 | 7,999 | 24,551 | 23,007
Office Pittsburgh, PA [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Rental and Other Revenues | 14,982 | 14,719 | 45,587 | 44,420
Total Net Operating Income | 8,969 | 8,822 | 27,189 | 26,396
Office Raleigh, NC [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Rental and Other Revenues | 30,432 | 30,524 | 89,518 | 90,167
Total Net Operating Income | 22,018 | 21,960 | 65,384 | 65,345
Office Richmond, VA [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Rental and Other Revenues | 11,262 | 11,152 | 33,204 | 33,200
Total Net Operating Income | 7,376 | 6,987 | 22,616 | 22,453
Office Tampa, FL [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Rental and Other Revenues | 25,460 | 25,072 | 76,726 | 72,578
Total Net Operating Income | 16,188 | 15,972 | 49,448 | 46,297
Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Rental and Other Revenues | 3,157 | 3,164 | 9,574 | 9,797
Total Net Operating Income | $ 2,336 | $ 2,314 | $ 7,078 | $ 6,904

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