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Investments In and Advances To Affiliates (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2012
Schedule of Equity Method Investments [Line Items] |  |  |  |
Percentage of equity interest in joint ventures, maximum | 50.00% |  |  |
Difference between cost of investments and the net book value of underlying net assets | $ 700 | $ (1,200) |  |
Development, management and leasing fees revenue | 1,400 | 800 | $ 1,400 |
Receivables from management and leasing fees | 100 | 100 |  |
Consolidated Affiliates: |  |  |  |
Joint venture partner's interest in unconsolidated affiliate (in hundredths) |  |  | 80.00% |
Gain recorded on disposition of investment in unconsolidated affiliate | $ 0 | $ 0 | $ 4,155 |
Plaza Colonnade, Tenant-in-Common [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Percentage of equity interest in joint ventures, maximum | 50.00% |  |  |
Kessinger/Hunter & Company, LC [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Percentage of equity interest in joint ventures, maximum | 26.50% |  |  |
Highwoods DLF Forum, LLC Joint Venture [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Percentage of equity interest in joint ventures, maximum | 25.00% |  |  |
Highwoods DLF 98/29, LLC Joint Venture [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Percentage of equity interest in joint ventures, maximum | 22.80% |  |  |
Highwoods-Markel Associates, LLC Joint Venture [Member] |  |  |  |
Consolidated Affiliates: |  |  |  |
Percentage of equity interest in consolidated affiliates | 50.00% |  |  |
Fair value of noncontrolling interests in consolidated affiliate | $ 26,100 |  |  |
SF-Harborview Plaza, LP Joint Venture [Member] |  |  |  |
Consolidated Affiliates: |  |  |  |
Percentage of equity interest in consolidated affiliates |  |  | 20.00% |
Advance to consolidated affiliate |  |  | $ 20,800 | $ 20,800
Term of debt instrument (in years) |  |  |  | 3 years
Scheduled maturity date |  |  |  | Sep. 30, 2015
Gain recorded on disposition of investment in unconsolidated affiliate |  |  | 4,200 |
Net proceeds received from disposition of investment in unconsolidated affiliate |  |  | $ 6,900 |

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- Definition The purchase price of real estate before or after closing credits to buyer for unfunded tenant improvements, building improvements or free rent, if any, of an equity method investee. + References No definition available. + Details
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