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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, 2017 | Sep. 30, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | --- | ---
Assets: |  |  |  |  |
Mortgages and notes receivable, at fair value | $ 6,425 |  | $ 8,833 |  |
Interest rate swaps (in prepaid expenses and other assets) | 1,286 |  | 7,619 |  |
Marketable securities of non-qualified deferred compensation plan (in prepaid expenses and other assets) | 2,388 |  | 2,451 | $ 2,736 |
Total Assets | 10,099 |  | 18,903 |  |
Liabilities: |  |  |  |  |
Mortgages and notes payable, net, at fair value | 2,015,689 |  | 1,965,611 |  |
Interest rate swaps (in accounts payable, accrued expenses and other liabilities) |  |  | 1,870 |  |
Non-qualified deferred compensation obligation (in accounts payable, accrued expenses and other liabilities) | 2,388 |  | 2,451 | $ 2,736 | $ 3,635
Total Liabilities | 2,018,077 |  | 1,969,932 |  |
Level 1 [Member] |  |  |  |  |
Assets: |  |  |  |  |
Mortgages and notes receivable, at fair value | 0 |  | 0 |  |
Interest rate swaps (in prepaid expenses and other assets) | 0 |  | 0 |  |
Marketable securities of non-qualified deferred compensation plan (in prepaid expenses and other assets) | 2,388 |  | 2,451 |  |
Total Assets | 2,388 |  | 2,451 |  |
Liabilities: |  |  |  |  |
Mortgages and notes payable, net, at fair value | 0 |  | 0 |  |
Interest rate swaps (in accounts payable, accrued expenses and other liabilities) |  |  | 0 |  |
Non-qualified deferred compensation obligation (in accounts payable, accrued expenses and other liabilities) | 2,388 |  | 2,451 |  |
Total Liabilities | 2,388 |  | 2,451 |  |
Level 2 [Member] |  |  |  |  |
Assets: |  |  |  |  |
Mortgages and notes receivable, at fair value | 6,425 |  | 8,833 |  |
Interest rate swaps (in prepaid expenses and other assets) | 1,286 |  | 7,619 |  |
Marketable securities of non-qualified deferred compensation plan (in prepaid expenses and other assets) | 0 |  | 0 |  |
Total Assets | 7,711 |  | 16,452 |  |
Liabilities: |  |  |  |  |
Mortgages and notes payable, net, at fair value | 2,015,689 |  | 1,965,611 |  |
Interest rate swaps (in accounts payable, accrued expenses and other liabilities) |  |  | 1,870 |  |
Non-qualified deferred compensation obligation (in accounts payable, accrued expenses and other liabilities) | 0 |  | 0 |  |
Total Liabilities | 2,015,689 |  | 1,967,481 |  |
Level 3 [Member] |  |  |  |  |
Liabilities: |  |  |  |  |
Impaired real estate assets |  | $ 5,900 |  |  |
Highwoods Properties, Inc. [Member] |  |  |  |  |
Assets: |  |  |  |  |
Noncontrolling Interests in the Operating Partnership | 144,009 |  | 144,802 |  |
Highwoods Properties, Inc. [Member] | Level 1 [Member] |  |  |  |  |
Assets: |  |  |  |  |
Noncontrolling Interests in the Operating Partnership | 144,009 |  | 144,802 |  |
Highwoods Properties, Inc. [Member] | Level 2 [Member] |  |  |  |  |
Assets: |  |  |  |  |
Noncontrolling Interests in the Operating Partnership | $ 0 |  | $ 0 |  |

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