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Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |
Total Rental and Other Revenues | $ 177,283 | $ 166,860 | $ 346,691 | $ 331,719
Total Net Operating Income | 118,429 | 109,345 | 230,441 | 216,624
Reconciliation to income from continuing operations before disposition of investment properties and activity in unconsolidated affiliates: |  |  |  |
Depreciation and amortization | (55,816) | (55,317) | (111,961) | (108,811)
General and administrative expenses | (9,050) | (8,327) | (20,540) | (19,464)
Interest expense | (16,154) | (19,485) | (34,017) | (40,190)
Other income | 1,390 | 534 | 2,074 | 1,051
Income from continuing operations before disposition of investment properties and activity in unconsolidated affiliates | 38,799 | 26,750 | 65,997 | 49,210
Total Office Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Rental and Other Revenues | 174,031 | 163,202 | 340,058 | 324,279
Total Net Operating Income | 116,180 | 106,763 | 225,851 | 211,491
Office Atlanta, GA [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Rental and Other Revenues | 35,347 | 34,652 | 69,556 | 67,848
Total Net Operating Income | 22,544 | 21,911 | 44,550 | 42,963
Office Greensboro, NC [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Rental and Other Revenues | 5,284 | 5,037 | 10,586 | 10,184
Total Net Operating Income | 3,391 | 3,209 | 6,749 | 6,357
Office Memphis, TN [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Rental and Other Revenues | 11,823 | 11,931 | 23,618 | 23,945
Total Net Operating Income | 7,272 | 7,398 | 14,544 | 14,813
Office Nashville, TN [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Rental and Other Revenues | 28,836 | 24,415 | 52,526 | 47,781
Total Net Operating Income | 21,626 | 17,613 | 38,250 | 34,428
Office Orlando, FL [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Rental and Other Revenues | 12,436 | 11,197 | 24,874 | 22,682
Total Net Operating Income | 7,430 | 6,320 | 15,008 | 13,005
Office Pittsburgh, PA [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Rental and Other Revenues | 14,852 | 14,195 | 29,701 | 29,335
Total Net Operating Income | 8,949 | 8,108 | 17,574 | 16,711
Office Raleigh, NC [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Rental and Other Revenues | 30,097 | 28,024 | 59,643 | 56,246
Total Net Operating Income | 21,920 | 20,156 | 43,385 | 40,410
Office Richmond, VA [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Rental and Other Revenues | 11,106 | 10,937 | 22,048 | 22,006
Total Net Operating Income | 7,845 | 7,687 | 15,466 | 15,116
Office Tampa, FL [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Rental and Other Revenues | 24,250 | 22,814 | 47,506 | 44,252
Total Net Operating Income | 15,203 | 14,361 | 30,325 | 27,688
Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Rental and Other Revenues | 3,252 | 3,658 | 6,633 | 7,440
Total Net Operating Income | $ 2,249 | $ 2,582 | $ 4,590 | $ 5,133

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