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Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Segment Reporting Information [Line Items] |  |
Total Rental and Other Revenues | $ 164,859 | $ 145,236
Total Net Operating Income | 107,279 | 92,722
Reconciliation to income from continuing operations before disposition of investment properties and activity in unconsolidated affiliates: |  |
Depreciation and amortization | (53,494) | (46,867)
General and administrative expenses | (11,137) | (11,243)
Interest expense | (20,705) | (21,242)
Other income | 517 | 582
Income from continuing operations before disposition of investment properties and activity in unconsolidated affiliates | 22,460 | 13,952
Total Office Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Total Rental and Other Revenues | 161,077 | 141,607
Total Net Operating Income | 104,728 | 90,230
Office Atlanta, GA [Member] |  |
Segment Reporting Information [Line Items] |  |
Total Rental and Other Revenues | 33,196 | 24,782
Total Net Operating Income | 21,052 | 15,367
Office Greensboro, NC [Member] |  |
Segment Reporting Information [Line Items] |  |
Total Rental and Other Revenues | 5,147 | 5,440
Total Net Operating Income | 3,148 | 3,426
Office Memphis, TN [Member] |  |
Segment Reporting Information [Line Items] |  |
Total Rental and Other Revenues | 12,014 | 11,734
Total Net Operating Income | 7,415 | 7,389
Office Nashville, TN [Member] |  |
Segment Reporting Information [Line Items] |  |
Total Rental and Other Revenues | 23,366 | 21,816
Total Net Operating Income | 16,815 | 15,232
Office Orlando, FL [Member] |  |
Segment Reporting Information [Line Items] |  |
Total Rental and Other Revenues | 11,485 | 10,834
Total Net Operating Income | 6,685 | 6,483
Office Pittsburgh, PA [Member] |  |
Segment Reporting Information [Line Items] |  |
Total Rental and Other Revenues | 15,140 | 14,549
Total Net Operating Income | 8,603 | 7,962
Office Raleigh, NC [Member] |  |
Segment Reporting Information [Line Items] |  |
Total Rental and Other Revenues | 28,222 | 23,441
Total Net Operating Income | 20,254 | 16,271
Office Richmond, VA [Member] |  |
Segment Reporting Information [Line Items] |  |
Total Rental and Other Revenues | 11,069 | 10,584
Total Net Operating Income | 7,429 | 6,880
Office Tampa, FL [Member] |  |
Segment Reporting Information [Line Items] |  |
Total Rental and Other Revenues | 21,438 | 18,427
Total Net Operating Income | 13,327 | 11,220
Other [Member] |  |
Segment Reporting Information [Line Items] |  |
Total Rental and Other Revenues | 3,782 | 3,629
Total Net Operating Income | $ 2,551 | $ 2,492

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- Definition The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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