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Disclosure About Fair Value of Financial Instruments - Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | --- | --- | ---
Assets: |  |  |  |  |  |
Mortgages and notes receivable, at fair value | $ 1,501 |  |  | $ 5,599 |  |
Interest rate swaps (in prepaid expenses and other assets) |  |  |  | 1,146 |  |
Marketable securities of non-qualified deferred compensation plan (in prepaid expenses and other assets) | 2,345 |  |  | 1,849 |  |
Impaired real estate assets |  |  |  | 10,252 |  |
Total Assets | 3,846 |  |  | 18,846 |  |
Liabilities: |  |  |  |  |  |
Mortgages and notes payable, net, at fair value | 2,615,776 |  |  | 2,056,248 |  |
Interest rate swaps (in accounts payable, accrued expenses and other liabilities) | 154 |  |  | 3,581 |  |
Non-qualified deferred compensation obligation (in accounts payable, accrued expenses and other liabilities) | 2,345 |  |  | 1,849 | $ 2,388 | $ 2,451
Total Liabilities | 2,618,275 |  |  | 2,061,678 |  |
Level 1 [Member] |  |  |  |  |  |
Assets: |  |  |  |  |  |
Mortgages and notes receivable, at fair value | 0 |  |  | 0 |  |
Interest rate swaps (in prepaid expenses and other assets) |  |  |  | 0 |  |
Marketable securities of non-qualified deferred compensation plan (in prepaid expenses and other assets) | 2,345 |  |  | 1,849 |  |
Impaired real estate assets |  |  |  | 0 |  |
Total Assets | 2,345 |  |  | 1,849 |  |
Liabilities: |  |  |  |  |  |
Mortgages and notes payable, net, at fair value | 0 |  |  | 0 |  |
Interest rate swaps (in accounts payable, accrued expenses and other liabilities) | 0 |  |  | 0 |  |
Non-qualified deferred compensation obligation (in accounts payable, accrued expenses and other liabilities) | 2,345 |  |  | 1,849 |  |
Total Liabilities | 2,345 |  |  | 1,849 |  |
Level 2 [Member] |  |  |  |  |  |
Assets: |  |  |  |  |  |
Mortgages and notes receivable, at fair value | 1,501 |  |  | 5,599 |  |
Interest rate swaps (in prepaid expenses and other assets) |  |  |  | 1,146 |  |
Marketable securities of non-qualified deferred compensation plan (in prepaid expenses and other assets) | 0 |  |  | 0 |  |
Impaired real estate assets |  |  |  | 0 |  |
Total Assets | 1,501 |  |  | 6,745 |  |
Liabilities: |  |  |  |  |  |
Mortgages and notes payable, net, at fair value | 2,615,776 |  |  | 2,056,248 |  |
Interest rate swaps (in accounts payable, accrued expenses and other liabilities) | 154 |  |  | 3,581 |  |
Non-qualified deferred compensation obligation (in accounts payable, accrued expenses and other liabilities) | 0 |  |  | 0 |  |
Total Liabilities | 2,615,930 |  |  | 2,059,829 |  |
Level 3 [Member] |  |  |  |  |  |
Assets: |  |  |  |  |  |
Mortgages and notes receivable, at fair value | 0 |  |  | 0 |  |
Interest rate swaps (in prepaid expenses and other assets) |  |  |  | 0 |  |
Marketable securities of non-qualified deferred compensation plan (in prepaid expenses and other assets) | 0 |  |  | 0 |  |
Impaired real estate assets |  | $ 7,600 | $ 700 | 10,252 |  |
Total Assets | 0 |  |  | 10,252 |  |
Liabilities: |  |  |  |  |  |
Mortgages and notes payable, net, at fair value | 0 |  |  | 0 |  |
Interest rate swaps (in accounts payable, accrued expenses and other liabilities) | 0 |  |  | 0 |  |
Non-qualified deferred compensation obligation (in accounts payable, accrued expenses and other liabilities) | 0 |  |  | 0 |  |
Total Liabilities | 0 |  |  | 0 |  |
Highwoods Properties, Inc. [Member] |  |  |  |  |  |
Assets: |  |  |  |  |  |
Noncontrolling Interests in the Operating Partnership | 133,216 |  |  | 105,960 |  |
Highwoods Properties, Inc. [Member] | Level 1 [Member] |  |  |  |  |  |
Assets: |  |  |  |  |  |
Noncontrolling Interests in the Operating Partnership | 133,216 |  |  | 105,960 |  |
Highwoods Properties, Inc. [Member] | Level 2 [Member] |  |  |  |  |  |
Assets: |  |  |  |  |  |
Noncontrolling Interests in the Operating Partnership | 0 |  |  | 0 |  |
Highwoods Properties, Inc. [Member] | Level 3 [Member] |  |  |  |  |  |
Assets: |  |  |  |  |  |
Noncontrolling Interests in the Operating Partnership | $ 0 |  |  | $ 0 |  |

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