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Investments In and Advances To Affiliates (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 USD ($) ft² | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Unconsolidated Affiliates: |  |  |
Percentage of equity interest in joint ventures, maximum | 50.00% |  |
Difference between cost of investments and the net book value of underlying net assets | $ 600 | $ 600 |
Rentable square feet of office property under development (in sq feet) | ft² | 600,000 |  |
Development, management and leasing fees recognized from unconsolidated affiliates | $ 1,600 | 1,000 | $ 500
Receivables from management and leasing fees |  | 200 |
Consolidated Affiliates: |  |  |
Gains on disposition of property | $ 174,059 | $ 215,897 | $ 39,517
Plaza Colonnade, Tenant-in-Common [Member] |  |  |
Unconsolidated Affiliates: |  |  |
Percentage of equity interest in joint ventures, maximum | 50.00% |  |
Brand/HRLP 2827 Peachtree LLC |  |  |
Unconsolidated Affiliates: |  |  |
Percentage of equity interest in joint ventures, maximum | 50.00% |  |
Rentable square feet of office property under development (in sq feet) | ft² | 135,000 |  |
Total anticipated development costs | $ 79,000 |  |
Contribution of cash to acquire interest in joint venture | 13,300 |  |
Cash funded to acquire interest in joint venture | 6,100 |  |
Partner's contribution of property to acquire interest in joint venture | 7,700 |  |
Contribution of cash from affiliate | $ 5,600 |  |
Partner's percentage of equity interest in joint venture (in hundredths) | 50.00% |  |
Advance to affiliate | $ 49,600 |  |
Term of optional extension | 1 year |  |
Interest rate, basis spread (in hundredths) | 3.00% |  |
Amount of loan funded to affiliate | $ 0 |  |
Risk of loss for variable interest entity | $ 6,100 |  |
Brand/HRLP 2827 Peachtree LLC | London Interbank Offered Rate (LIBOR) [Member] |  |  |
Unconsolidated Affiliates: |  |  |
Interest rate basis | LIBOR |  |
Kessinger/Hunter & Company, LC [Member] |  |  |
Unconsolidated Affiliates: |  |  |
Percentage of equity interest in joint ventures, maximum | 26.50% |  |
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 | $ 31,100 |  |
Sale price of disposition | 3,000 |  |
Gains on disposition of property | $ 1,300 |  |

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