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Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Segment Reporting [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Limit of consolidated revenue generated by any single customer |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental and other revenues | $ 148,988 | $ 144,827 | $ 132,618 | $ 130,377 | $ 126,316 | $ 120,456 | $ 120,423 | $ 117,851 | $ 556,810 |  | $ 485,046 |  | $ 431,956 |
Total net operating income |  |  |  |  |  |  |  |  | 353,466 |  | 308,302 |  | 274,650 |
Reconciliation to income from continuing operations before disposition of property, condominiums and investments in unconsolidated affiliates and equity in earnings of unconsolidated affiliates: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | (176,957) |  | (146,357) |  | (127,499) |
General and administrative expense |  |  |  |  |  |  |  |  | (37,193) |  | (37,377) |  | (35,727) |
Interest expense |  |  |  |  |  |  |  |  | (92,703) |  | (96,114) |  | (95,510) |
Other income |  |  |  |  |  |  |  |  | 6,398 |  | 6,380 |  | 7,363 |
Income from continuing operations before disposition of investment properties and activity in unconsolidated affiliates |  |  |  |  |  |  |  |  | 53,011 |  | 34,834 |  | 23,277 |
Total Assets | 3,807,101 |  |  |  | 3,350,428 |  |  |  | 3,807,101 |  | 3,350,428 |  |  |
Office Total Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental and other revenues |  |  |  |  |  |  |  |  | 505,937 | [1] | 434,531 | [1] | 384,904 | [1]
Total net operating income |  |  |  |  |  |  |  |  | 321,040 | [1] | 276,446 | [1] | 245,506 | [1]
Reconciliation to income from continuing operations before disposition of property, condominiums and investments in unconsolidated affiliates and equity in earnings of unconsolidated affiliates: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets | 3,425,874 |  |  |  | 2,828,796 |  |  |  | 3,425,874 |  | 2,828,796 |  |  |
Office Atlanta, GA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental and other revenues |  |  |  |  |  |  |  |  | 80,330 |  | 60,474 |  | 48,839 |
Total net operating income |  |  |  |  |  |  |  |  | 49,650 |  | 38,186 |  | 30,513 |
Reconciliation to income from continuing operations before disposition of property, condominiums and investments in unconsolidated affiliates and equity in earnings of unconsolidated affiliates: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets | 699,263 |  |  |  | 495,175 |  |  |  | 699,263 |  | 495,175 |  |  |
Office Greenville, SC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental and other revenues |  |  |  |  |  |  |  |  | 3,399 |  | 3,269 |  | 3,168 |
Total net operating income |  |  |  |  |  |  |  |  | 1,893 |  | 1,701 |  | 1,693 |
Reconciliation to income from continuing operations before disposition of property, condominiums and investments in unconsolidated affiliates and equity in earnings of unconsolidated affiliates: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets | 15,890 |  |  |  | 69,138 |  |  |  | 15,890 |  | 69,138 |  |  |
Office Kansas City, MO [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental and other revenues |  |  |  |  |  |  |  |  | 16,303 |  | 14,995 |  | 13,789 |
Total net operating income |  |  |  |  |  |  |  |  | 10,694 |  | 9,509 |  | 8,370 |
Reconciliation to income from continuing operations before disposition of property, condominiums and investments in unconsolidated affiliates and equity in earnings of unconsolidated affiliates: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets | 83,124 |  |  |  | 84,538 |  |  |  | 83,124 |  | 84,538 |  |  |
Office Memphis, TN [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental and other revenues |  |  |  |  |  |  |  |  | 38,369 |  | 36,812 |  | 36,787 |
Total net operating income |  |  |  |  |  |  |  |  | 22,133 |  | 21,831 |  | 20,862 |
Reconciliation to income from continuing operations before disposition of property, condominiums and investments in unconsolidated affiliates and equity in earnings of unconsolidated affiliates: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets | 249,479 |  |  |  | 225,541 |  |  |  | 249,479 |  | 225,541 |  |  |
Office Nashville, TN [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental and other revenues |  |  |  |  |  |  |  |  | 62,054 |  | 56,512 |  | 53,621 |
Total net operating income |  |  |  |  |  |  |  |  | 42,598 |  | 38,801 |  | 36,566 |
Reconciliation to income from continuing operations before disposition of property, condominiums and investments in unconsolidated affiliates and equity in earnings of unconsolidated affiliates: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets | 490,887 |  |  |  | 314,705 |  |  |  | 490,887 |  | 314,705 |  |  |
Office Orlando, FL [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental and other revenues |  |  |  |  |  |  |  |  | 21,798 |  | 9,052 |  | 8,099 |
Total net operating income |  |  |  |  |  |  |  |  | 12,048 |  | 4,334 |  | 3,788 |
Reconciliation to income from continuing operations before disposition of property, condominiums and investments in unconsolidated affiliates and equity in earnings of unconsolidated affiliates: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets | 226,314 |  |  |  | 51,373 |  |  |  | 226,314 |  | 51,373 |  |  |
Office Piedmont Triad, NC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental and other revenues |  |  |  |  |  |  |  |  | 26,047 |  | 19,489 |  | 18,456 |
Total net operating income |  |  |  |  |  |  |  |  | 16,788 |  | 12,282 |  | 11,835 |
Reconciliation to income from continuing operations before disposition of property, condominiums and investments in unconsolidated affiliates and equity in earnings of unconsolidated affiliates: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets | 164,885 |  |  |  | 144,404 |  |  |  | 164,885 |  | 144,404 |  |  |
Office Pittsburgh, PA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental and other revenues |  |  |  |  |  |  |  |  | 56,125 |  | 38,776 |  | 10,964 |
Total net operating income |  |  |  |  |  |  |  |  | 31,134 |  | 19,530 |  | 5,452 |
Reconciliation to income from continuing operations before disposition of property, condominiums and investments in unconsolidated affiliates and equity in earnings of unconsolidated affiliates: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets | 335,798 |  |  |  | 330,975 |  |  |  | 335,798 |  | 330,975 |  |  |
Office Raleigh, NC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental and other revenues |  |  |  |  |  |  |  |  | 85,417 |  | 81,581 |  | 78,606 |
Total net operating income |  |  |  |  |  |  |  |  | 60,075 |  | 56,584 |  | 54,670 |
Reconciliation to income from continuing operations before disposition of property, condominiums and investments in unconsolidated affiliates and equity in earnings of unconsolidated affiliates: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets | 494,208 |  |  |  | 479,995 |  |  |  | 494,208 |  | 479,995 |  |  |
Office Richmond, VA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental and other revenues |  |  |  |  |  |  |  |  | 47,576 |  | 47,284 |  | 47,505 |
Total net operating income |  |  |  |  |  |  |  |  | 32,454 |  | 32,382 |  | 31,265 |
Reconciliation to income from continuing operations before disposition of property, condominiums and investments in unconsolidated affiliates and equity in earnings of unconsolidated affiliates: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets | 241,739 |  |  |  | 246,276 |  |  |  | 241,739 |  | 246,276 |  |  |
Office Tampa, FL [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental and other revenues |  |  |  |  |  |  |  |  | 68,519 |  | 66,287 |  | 65,070 |
Total net operating income |  |  |  |  |  |  |  |  | 41,573 |  | 41,306 |  | 40,492 |
Reconciliation to income from continuing operations before disposition of property, condominiums and investments in unconsolidated affiliates and equity in earnings of unconsolidated affiliates: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets | 424,287 |  |  |  | 386,676 |  |  |  | 424,287 |  | 386,676 |  |  |
Industrial Total Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental and other revenues |  |  |  |  |  |  |  |  | 12,997 | [1] | 13,324 | [1] | 12,797 | [1]
Total net operating income |  |  |  |  |  |  |  |  | 9,429 | [1] | 9,610 | [1] | 9,268 | [1]
Reconciliation to income from continuing operations before disposition of property, condominiums and investments in unconsolidated affiliates and equity in earnings of unconsolidated affiliates: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets | 100,772 |  |  |  | 191,343 |  |  |  | 100,772 |  | 191,343 |  |  |
Industrial Atlanta, GA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental and other revenues |  |  |  |  |  |  |  |  | 827 |  | 812 |  | 975 |
Total net operating income |  |  |  |  |  |  |  |  | 492 |  | 468 |  | 620 |
Reconciliation to income from continuing operations before disposition of property, condominiums and investments in unconsolidated affiliates and equity in earnings of unconsolidated affiliates: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets | 25,936 |  |  |  | 115,330 |  |  |  | 25,936 |  | 115,330 |  |  |
Industrial Piedmont Triad, NC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental and other revenues |  |  |  |  |  |  |  |  | 12,170 |  | 12,512 |  | 11,822 |
Total net operating income |  |  |  |  |  |  |  |  | 8,937 |  | 9,142 |  | 8,648 |
Reconciliation to income from continuing operations before disposition of property, condominiums and investments in unconsolidated affiliates and equity in earnings of unconsolidated affiliates: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets | 74,836 |  |  |  | 76,013 |  |  |  | 74,836 |  | 76,013 |  |  |
Total Retail Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental and other revenues |  |  |  |  |  |  |  |  | 37,876 | [1] | 37,191 | [1] | 34,255 | [1]
Total net operating income |  |  |  |  |  |  |  |  | 23,074 | [1] | 22,510 | [1] | 20,147 | [1]
Reconciliation to income from continuing operations before disposition of property, condominiums and investments in unconsolidated affiliates and equity in earnings of unconsolidated affiliates: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets | 161,779 |  |  |  | 166,030 |  |  |  | 161,779 |  | 166,030 |  |  |
Retail Kansas City, MO [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental and other revenues |  |  |  |  |  |  |  |  | 37,876 |  | 37,191 |  | 34,255 |
Total net operating income |  |  |  |  |  |  |  |  | 23,074 |  | 22,510 |  | 20,147 |
Reconciliation to income from continuing operations before disposition of property, condominiums and investments in unconsolidated affiliates and equity in earnings of unconsolidated affiliates: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets | 161,779 |  |  |  | 166,030 |  |  |  | 161,779 |  | 166,030 |  |  |
Total Residential Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total net operating income |  |  |  |  |  |  |  |  | 0 | [1] | (178) | [1] | (195) | [1]
Reconciliation to income from continuing operations before disposition of property, condominiums and investments in unconsolidated affiliates and equity in earnings of unconsolidated affiliates: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets | 0 |  |  |  | 8 |  |  |  | 0 |  | 8 |  |  |
Residential Raleigh, NC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total net operating income |  |  |  |  |  |  |  |  | 0 |  | (178) |  | (195) |
Reconciliation to income from continuing operations before disposition of property, condominiums and investments in unconsolidated affiliates and equity in earnings of unconsolidated affiliates: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets | 0 |  |  |  | 8 |  |  |  | 0 |  | 8 |  |  |
Total Corporate and Other Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total net operating income |  |  |  |  |  |  |  |  | (77) | [1] | (86) | [1] | (76) | [1]
Reconciliation to income from continuing operations before disposition of property, condominiums and investments in unconsolidated affiliates and equity in earnings of unconsolidated affiliates: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets | $ 118,676 |  |  |  | $ 164,251 |  |  |  | $ 118,676 |  | $ 164,251 |  |  |
[1] | Net of discontinued operations.

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