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Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Total Rental and Other Revenues | $ 178,792 | $ 177,283 | $ 359,230 | $ 346,691
Total Net Operating Income | 119,129 | 118,429 | 240,135 | 230,441
Reconciliation to income before disposition of investment properties and activity in unconsolidated affiliates: |  |  |  |
Depreciation and amortization | (56,694) | (55,816) | (114,262) | (111,961)
General and administrative expenses | (9,540) | (9,050) | (21,318) | (20,540)
Interest expense | (17,877) | (16,154) | (36,268) | (34,017)
Other income | 462 | 1,390 | 917 | 2,074
Income before disposition of investment properties and activity in unconsolidated affiliates | 35,480 | 38,799 | 69,204 | 65,997
Total Office Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Rental and Other Revenues | 175,513 | 174,031 | 352,813 | 340,058
Total Net Operating Income | 116,637 | 116,180 | 235,393 | 225,851
Office Atlanta, GA [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Rental and Other Revenues | 34,777 | 35,347 | 70,260 | 69,556
Total Net Operating Income | 21,608 | 22,544 | 44,278 | 44,550
Office Greensboro, NC [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Rental and Other Revenues | 5,378 | 5,284 | 11,404 | 10,586
Total Net Operating Income | 3,434 | 3,391 | 7,445 | 6,749
Office Memphis, TN [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Rental and Other Revenues | 9,899 | 11,823 | 20,107 | 23,618
Total Net Operating Income | 6,173 | 7,272 | 12,818 | 14,544
Office Nashville, TN [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Rental and Other Revenues | 30,669 | 28,836 | 61,392 | 52,526
Total Net Operating Income | 22,427 | 21,626 | 44,410 | 38,250
Office Orlando, FL [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Rental and Other Revenues | 13,451 | 12,436 | 26,751 | 24,874
Total Net Operating Income | 8,093 | 7,430 | 16,356 | 15,008
Office Pittsburgh, PA [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Rental and Other Revenues | 15,323 | 14,852 | 30,605 | 29,701
Total Net Operating Income | 9,249 | 8,949 | 18,220 | 17,574
Office Raleigh, NC [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Rental and Other Revenues | 29,282 | 30,097 | 59,086 | 59,643
Total Net Operating Income | 21,494 | 21,920 | 43,366 | 43,385
Office Richmond, VA [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Rental and Other Revenues | 10,893 | 11,106 | 21,942 | 22,048
Total Net Operating Income | 7,659 | 7,845 | 15,240 | 15,466
Office Tampa, FL [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Rental and Other Revenues | 25,841 | 24,250 | 51,266 | 47,506
Total Net Operating Income | 16,500 | 15,203 | 33,260 | 30,325
Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Rental and Other Revenues | 3,279 | 3,252 | 6,417 | 6,633
Total Net Operating Income | $ 2,492 | $ 2,249 | $ 4,742 | $ 4,590

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