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Description of Business and Significant Accounting Policies (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Sep. 30, 2021 USD ($) ft² a numberOfBuildings numberOfLoans shares | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) ft² a numberOfBuildings numberOfLoans $ / shares shares | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Description of Business [Abstract] |  |  |  |  |
Rentable square feet of commercial real estate properties (in sq feet) | ft² | 29,000,000 |  | 29,000,000 |  |
Undeveloped land suitable for future development (in acres) | a | 300 |  | 300 |  |
Net proceeds of Common Stock sold during the period | $ 7,508 | $ 387 | $ 13,405 | $ 1,788 |
Self insurance liability | 500 |  | 500 |  |
Deferred rents included in accounts receivable | 1,200 |  | 1,200 |  |
PAC Portfolio Acquisition [Member] |  |  |  |  |
Description of Business [Abstract] |  |  |  |  |
Acquisition purchase price | 653,600 |  |  |  |
Capitalized acquisition costs | $ 4,500 |  | $ 4,500 |  |
Number of loans assumed in acquisition | numberOfLoans | 4 |  | 4 |  |
Fair value of debt assumed from the acquisition | $ 403,000 |  | $ 403,000 |  |
Effective interest rate of secured debt assumed from the acquisition | 3.54% |  | 3.54% |  |
Term of debt instrument | 10 years 8 months 12 days |  |  |  |
Deferred financing fees | $ 3,500 |  | $ 3,500 |  |
150 Fayetteville Asset [Member] |  |  |  |  |
Description of Business [Abstract] |  |  |  |  |
Rentable square feet of commercial real estate properties (in sq feet) | ft² | 560,000 |  | 560,000 |  |
CAPTRUST Towers Asset [Member] |  |  |  |  |
Description of Business [Abstract] |  |  |  |  |
Rentable square feet of commercial real estate properties (in sq feet) | ft² | 300,000 |  | 300,000 |  |
Capitol Towers Asset [Member] |  |  |  |  |
Description of Business [Abstract] |  |  |  |  |
Rentable square feet of commercial real estate properties (in sq feet) | ft² | 479,000 |  | 479,000 |  |
Morrocroft Centre Asset [Member] |  |  |  |  |
Description of Business [Abstract] |  |  |  |  |
Rentable square feet of commercial real estate properties (in sq feet) | ft² | 291,000 |  | 291,000 |  |
Highwoods Properties, Inc. [Member] |  |  |  |  |
Description of Business [Abstract] |  |  |  |  |
Common Units of partnership owned by the Company (in shares) | shares | 104,000,000 |  | 104,000,000 |  |
Percentage of ownership of Common Units (in hundredths) | 97.40% |  | 97.40% |  | 97.30%
Common Units redeemed for a like number of common shares of stock (in shares) | shares |  |  | 6,238 |  |
Highwoods Properties, Inc. [Member] | ATM Equity Offering |  |  |  |  |
Description of Business [Abstract] |  |  |  |  |
Net proceeds of Common Stock sold during the period |  |  | $ 13,600 |  |
Number of Common Stock sold during the period (in shares) | shares |  |  | 299,360 |  |
Average price of Common Stock sold during the period (in dollars per share) | $ / shares |  |  | $ 45.96 |  |
Highwoods Properties, Inc. [Member] | ATM Equity Offering | Maximum [Member] |  |  |  |  |
Description of Business [Abstract] |  |  |  |  |
Net proceeds of Common Stock sold during the period |  |  |  |  | $ 300,000
Highwoods Realty Limited Partnership [Member] |  |  |  |  |
Description of Business [Abstract] |  |  |  |  |
Common Units of partnership not owned by the Company (in shares) | shares | 2,800,000 |  | 2,800,000 |  |
Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |
Description of Business [Abstract] |  |  |  |  |
VIE like-kind exchange agreement (in days) | 180 days |  |  |  |
Variable Interest Entity, Primary Beneficiary [Member] | Minimum [Member] |  |  |  |  |
Description of Business [Abstract] |  |  |  |  |
Number of 1031 transactions (minimum) | numberOfBuildings | 1 |  | 1 |  |

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