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Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Rental and other revenues | $ 175,861 | $ 180,185 | $ 177,283 | $ 169,408 | $ 167,646 | $ 166,269 | $ 166,860 | $ 164,859 | $ 702,737 | $ 665,634 | $ 604,671
Total net operating income |  |  |  |  |  |  |  |  | 465,849 | 434,549 | 388,730
Reconciliation to income from continuing operations before disposition of investment properties and activity in unconsolidated affiliates: |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | (227,832) | (220,140) | (201,918)
Impairments of real estate assets |  |  |  |  |  |  |  |  | (1,445) | 0 | 0
General and administrative expenses |  |  |  |  |  |  |  |  | (39,648) | (38,153) | (37,642)
Interest expense |  |  |  |  |  |  |  |  | (69,105) | (76,648) | (86,052)
Other income |  |  |  |  |  |  |  |  | 2,283 | 2,338 | 1,726
Income from continuing operations before disposition of investment properties and activity in unconsolidated affiliates |  |  |  |  |  |  |  |  | 130,102 | 101,946 | 64,844
Total Assets | 4,623,791 |  |  |  | 4,561,050 |  |  |  | 4,623,791 | 4,561,050 |
Office Total Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Rental and other revenues |  |  |  |  |  |  |  |  | 689,788 | 651,511 | 589,946
Total net operating income |  |  |  |  |  |  |  |  | 456,628 | 424,731 | 378,632
Reconciliation to income from continuing operations before disposition of investment properties and activity in unconsolidated affiliates: |  |  |  |  |  |  |  |  |  |  |
Total Assets | 4,391,387 |  |  |  | 4,340,446 |  |  |  | 4,391,387 | 4,340,446 |
Office Atlanta, GA [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Rental and other revenues |  |  |  |  |  |  |  |  | 140,323 | 134,601 | 108,590
Total net operating income |  |  |  |  |  |  |  |  | 89,575 | 84,733 | 67,094
Reconciliation to income from continuing operations before disposition of investment properties and activity in unconsolidated affiliates: |  |  |  |  |  |  |  |  |  |  |
Total Assets | 1,049,100 |  |  |  | 1,039,519 |  |  |  | 1,049,100 | 1,039,519 |
Office Greensboro, NC [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Rental and other revenues |  |  |  |  |  |  |  |  | 21,453 | 20,522 | 21,251
Total net operating income |  |  |  |  |  |  |  |  | 13,612 | 12,781 | 13,395
Reconciliation to income from continuing operations before disposition of investment properties and activity in unconsolidated affiliates: |  |  |  |  |  |  |  |  |  |  |
Total Assets | 134,194 |  |  |  | 127,887 |  |  |  | 134,194 | 127,887 |
Office Memphis, TN [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Rental and other revenues |  |  |  |  |  |  |  |  | 45,430 | 48,251 | 47,137
Total net operating income |  |  |  |  |  |  |  |  | 28,128 | 30,038 | 29,534
Reconciliation to income from continuing operations before disposition of investment properties and activity in unconsolidated affiliates: |  |  |  |  |  |  |  |  |  |  |
Total Assets | 218,088 |  |  |  | 271,115 |  |  |  | 218,088 | 271,115 |
Office Nashville, TN [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Rental and other revenues |  |  |  |  |  |  |  |  | 111,506 | 95,912 | 88,310
Total net operating income |  |  |  |  |  |  |  |  | 81,204 | 68,678 | 62,387
Reconciliation to income from continuing operations before disposition of investment properties and activity in unconsolidated affiliates: |  |  |  |  |  |  |  |  |  |  |
Total Assets | 806,725 |  |  |  | 714,905 |  |  |  | 806,725 | 714,905 |
Office Orlando, FL [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Rental and other revenues |  |  |  |  |  |  |  |  | 51,236 | 46,260 | 44,621
Total net operating income |  |  |  |  |  |  |  |  | 30,526 | 26,525 | 25,524
Reconciliation to income from continuing operations before disposition of investment properties and activity in unconsolidated affiliates: |  |  |  |  |  |  |  |  |  |  |
Total Assets | 306,970 |  |  |  | 307,021 |  |  |  | 306,970 | 307,021 |
Office Pittsburgh, PA [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Rental and other revenues |  |  |  |  |  |  |  |  | 59,103 | 58,789 | 59,392
Total net operating income |  |  |  |  |  |  |  |  | 34,784 | 34,175 | 34,348
Reconciliation to income from continuing operations before disposition of investment properties and activity in unconsolidated affiliates: |  |  |  |  |  |  |  |  |  |  |
Total Assets | 334,136 |  |  |  | 353,816 |  |  |  | 334,136 | 353,816 |
Office Raleigh, NC [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Rental and other revenues |  |  |  |  |  |  |  |  | 119,254 | 112,958 | 102,841
Total net operating income |  |  |  |  |  |  |  |  | 86,475 | 80,803 | 72,981
Reconciliation to income from continuing operations before disposition of investment properties and activity in unconsolidated affiliates: |  |  |  |  |  |  |  |  |  |  |
Total Assets | 762,331 |  |  |  | 760,607 |  |  |  | 762,331 | 760,607 |
Office Richmond, VA [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Rental and other revenues |  |  |  |  |  |  |  |  | 43,959 | 44,315 | 42,089
Total net operating income |  |  |  |  |  |  |  |  | 29,946 | 30,505 | 27,922
Reconciliation to income from continuing operations before disposition of investment properties and activity in unconsolidated affiliates: |  |  |  |  |  |  |  |  |  |  |
Total Assets | 229,468 |  |  |  | 212,508 |  |  |  | 229,468 | 212,508 |
Office Tampa, FL [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Rental and other revenues |  |  |  |  |  |  |  |  | 97,524 | 89,903 | 75,715
Total net operating income |  |  |  |  |  |  |  |  | 62,378 | 56,493 | 45,447
Reconciliation to income from continuing operations before disposition of investment properties and activity in unconsolidated affiliates: |  |  |  |  |  |  |  |  |  |  |
Total Assets | 550,375 |  |  |  | 553,068 |  |  |  | 550,375 | 553,068 |
Other Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Rental and other revenues |  |  |  |  |  |  |  |  | 12,949 | 14,123 | 14,725
Total net operating income |  |  |  |  |  |  |  |  | 9,221 | 9,818 | $ 10,098
Reconciliation to income from continuing operations before disposition of investment properties and activity in unconsolidated affiliates: |  |  |  |  |  |  |  |  |  |  |
Total Assets | $ 232,404 |  |  |  | $ 220,604 |  |  |  | $ 232,404 | $ 220,604 |

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