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Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Segment Reporting Information [Line Items] |  |  |  |
Total Rental and Other Revenues | $ 166,269 | $ 150,766 | $ 497,988 | $ 444,545
Total Net Operating Income | 107,649 | 96,336 | 324,273 | 285,231
Reconciliation to income from continuing operations before disposition of investment properties and activity in unconsolidated affiliates: |  |  |  |
Depreciation and amortization | (52,923) | (50,963) | (161,734) | (145,758)
General and administrative expenses | (9,863) | (8,990) | (29,327) | (28,898)
Interest expense | (18,566) | (21,357) | (58,756) | (64,446)
Other income | 833 | 379 | 1,884 | 1,261
Income from continuing operations before disposition of investment properties and activity in unconsolidated affiliates | 27,130 | 15,405 | 76,340 | 47,390
Total Office Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Rental and Other Revenues | 162,897 | 147,087 | 487,176 | 433,536
Total Net Operating Income | 105,291 | 93,823 | 316,782 | 277,681
Office Atlanta, GA [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Rental and Other Revenues | 33,340 | 25,737 | 101,188 | 76,130
Total Net Operating Income | 20,718 | 15,970 | 63,681 | 47,000
Office Greensboro, NC [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Rental and Other Revenues | 5,167 | 5,288 | 15,351 | 16,126
Total Net Operating Income | 3,187 | 3,275 | 9,544 | 10,217
Office Memphis, TN [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Rental and Other Revenues | 12,330 | 11,790 | 36,275 | 35,574
Total Net Operating Income | 7,753 | 7,317 | 22,566 | 22,347
Office Nashville, TN [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Rental and Other Revenues | 23,979 | 22,614 | 71,760 | 66,200
Total Net Operating Income | 17,042 | 15,726 | 51,470 | 46,438
Office Orlando, FL [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Rental and Other Revenues | 11,678 | 11,397 | 34,360 | 33,179
Total Net Operating Income | 6,633 | 6,153 | 19,638 | 18,984
Office Pittsburgh, PA [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Rental and Other Revenues | 14,386 | 14,831 | 43,721 | 44,099
Total Net Operating Income | 8,482 | 8,840 | 25,193 | 25,472
Office Raleigh, NC [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Rental and Other Revenues | 27,767 | 27,081 | 84,013 | 76,063
Total Net Operating Income | 19,525 | 19,018 | 59,935 | 53,647
Office Richmond, VA [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Rental and Other Revenues | 11,414 | 10,564 | 33,420 | 31,351
Total Net Operating Income | 7,602 | 6,909 | 22,718 | 20,721
Office Tampa, FL [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Rental and Other Revenues | 22,836 | 17,785 | 67,088 | 54,814
Total Net Operating Income | 14,349 | 10,615 | 42,037 | 32,855
Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Rental and Other Revenues | 3,372 | 3,679 | 10,812 | 11,009
Total Net Operating Income | $ 2,358 | $ 2,513 | $ 7,491 | $ 7,550

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