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Segment Information (Tables) | 3 Months Ended
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Mar. 31, 2017
Segment Reporting [Abstract] |
Reconciliation of Revenue from Segments to Consolidated [Table Text Block] | The following tables summarize the rental and other revenues and net operating income, the primary industry property-level performance metric used by our chief operating decision maker which is defined as rental and other revenues less rental property and other expenses, for each of our reportable segments.
| Three Months Ended March 31,
| 2017 |  | 2016
Rental and Other Revenues: |  |  |
Office: |  |  |
Atlanta | $ | 34,209 |  |  | $ | 33,196 |
Greensboro | 5,302 |  |  | 5,147 |
Memphis | 11,795 |  |  | 12,014 |
Nashville | 23,690 |  |  | 23,366 |
Orlando | 12,438 |  |  | 11,485 |
Pittsburgh | 14,849 |  |  | 15,140 |
Raleigh | 29,546 |  |  | 28,222 |
Richmond | 10,942 |  |  | 11,069 |
Tampa | 23,256 |  |  | 21,438 |
Total Office Segment | 166,027 |  |  | 161,077 |
Other | 3,381 |  |  | 3,782 |
Total Rental and Other Revenues | $ | 169,408 |  |  | $ | 164,859 |
Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block] |
| Three Months Ended March 31,
| 2017 |  | 2016
Net Operating Income: |  |  |
Office: |  |  |
Atlanta | $ | 22,006 |  |  | $ | 21,052 |
Greensboro | 3,358 |  |  | 3,148 |
Memphis | 7,272 |  |  | 7,415 |
Nashville | 16,624 |  |  | 16,815 |
Orlando | 7,578 |  |  | 6,685 |
Pittsburgh | 8,625 |  |  | 8,603 |
Raleigh | 21,465 |  |  | 20,254 |
Richmond | 7,621 |  |  | 7,429 |
Tampa | 15,122 |  |  | 13,327 |
Total Office Segment | 109,671 |  |  | 104,728 |
Other | 2,341 |  |  | 2,551 |
Total Net Operating Income | 112,012 |  |  | 107,279 |
Reconciliation to income from continuing operations before disposition of investment properties and activity in unconsolidated affiliates: |  |  |
Depreciation and amortization | (56,145 | ) |  | (53,494 | )
General and administrative expenses | (11,490 | ) |  | (11,137 | )
Interest expense | (17,863 | ) |  | (20,705 | )
Other income | 684 |  |  | 517 |
Income from continuing operations before disposition of investment properties and activity in unconsolidated affiliates | $ | 27,198 |  |  | $ | 22,460 |

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- Definition Tabular disclosure of the reconciliation of profit (loss) from reportable segments to the consolidated income (loss) before income tax expense (benefit) and discontinued operations. Includes, but is not limited to, reconciliation after income tax if income tax is allocated to the reportable segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8924-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599 + Details
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- Definition Tabular disclosure of all significant reconciling items in the reconciliation of total revenues from reportable segments to the entity's consolidated revenues. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8924-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599 + Details
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