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Segment Information | 12 Months Ended
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Dec. 31, 2017
Segment Reporting [Abstract] |
Segment Information | Segment Information Our principal business is the operation, acquisition and development of rental real estate properties. We evaluate our business by product type and by geographic location. Each product type has different customers and economic characteristics as to rental rates and terms, cost per rentable square foot of buildings, the purposes for which customers use the space, the degree of maintenance and customer support required and customer dependency on different economic drivers, among others. The operating results by geographic grouping are also regularly reviewed by our chief operating decision maker for assessing performance and other purposes. There are no material inter-segment transactions. Our accounting policies of the segments are the same as those used in our Consolidated Financial Statements. All operations are within the United States. 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 and which is defined as rental and other revenues less rental property and other expenses, for each of our reportable segments.
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Rental and Other Revenues: |  |  |  |  |
Office: |  |  |  |  |
Atlanta | $ | 140,323 |  |  | $ | 134,601 |  |  | $ | 108,590 |
Greensboro | 21,453 |  |  | 20,522 |  |  | 21,251 |
Memphis | 45,430 |  |  | 48,251 |  |  | 47,137 |
Nashville | 111,506 |  |  | 95,912 |  |  | 88,310 |
Orlando | 51,236 |  |  | 46,260 |  |  | 44,621 |
Pittsburgh | 59,103 |  |  | 58,789 |  |  | 59,392 |
Raleigh | 119,254 |  |  | 112,958 |  |  | 102,841 |
Richmond | 43,959 |  |  | 44,315 |  |  | 42,089 |
Tampa | 97,524 |  |  | 89,903 |  |  | 75,715 |
Total Office Segment | 689,788 |  |  | 651,511 |  |  | 589,946 |
Other | 12,949 |  |  | 14,123 |  |  | 14,725 |
Total Rental and Other Revenues | $ | 702,737 |  |  | $ | 665,634 |  |  | $ | 604,671 |
18. | Segment Information - Continued
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Net Operating Income: |  |  |  |  |
Office: |  |  |  |  |
Atlanta | $ | 89,575 |  |  | $ | 84,733 |  |  | $ | 67,094 |
Greensboro | 13,612 |  |  | 12,781 |  |  | 13,395 |
Memphis | 28,128 |  |  | 30,038 |  |  | 29,534 |
Nashville | 81,204 |  |  | 68,678 |  |  | 62,387 |
Orlando | 30,526 |  |  | 26,525 |  |  | 25,524 |
Pittsburgh | 34,784 |  |  | 34,175 |  |  | 34,348 |
Raleigh | 86,475 |  |  | 80,803 |  |  | 72,981 |
Richmond | 29,946 |  |  | 30,505 |  |  | 27,922 |
Tampa | 62,378 |  |  | 56,493 |  |  | 45,447 |
Total Office Segment | 456,628 |  |  | 424,731 |  |  | 378,632 |
Other | 9,221 |  |  | 9,818 |  |  | 10,098 |
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 | ) |  | — |  |  | — |
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 |
18. | Segment Information - Continued
| December 31,
| 2017 |  | 2016
Total Assets: |  |  |
Office: |  |  |
Atlanta | $ | 1,049,100 |  |  | $ | 1,039,519 |
Greensboro | 134,194 |  |  | 127,887 |
Memphis | 218,088 |  |  | 271,115 |
Nashville | 806,725 |  |  | 714,905 |
Orlando | 306,970 |  |  | 307,021 |
Pittsburgh | 334,136 |  |  | 353,816 |
Raleigh | 762,331 |  |  | 760,607 |
Richmond | 229,468 |  |  | 212,508 |
Tampa | 550,375 |  |  | 553,068 |
Total Office Segment | 4,391,387 |  |  | 4,340,446 |
Other | 232,404 |  |  | 220,604 |
Total Assets | $ | 4,623,791 |  |  | $ | 4,561,050 |

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -URI http://asc.fasb.org/topic&trid=2134510 + Details
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