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Description of Business and Significant Accounting Policies (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |
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Jun. 30, 2021 USD ($) a ft² propertyUnit numberOfLoans shares | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) a ft² propertyUnit numberOfLoans $ / shares shares | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) | Jul. 20, 2021 USD ($)
Description of Business [Abstract] |  |  |  |  |  |
Rentable square feet of commercial real estate properties (in sq feet) | ft² | 27,300,000 |  | 27,300,000 |  |  |
Rentable square feet of commercial real estate office properties under development (in sq feet) | ft² | 800,000 |  | 800,000 |  |  |
Undeveloped land suitable for future development (in acres) | a | 250 |  | 250 |  |  |
Net proceeds of Common Stock sold during the period | $ 7,095 | $ 362 | $ 5,897 | $ 1,401 |  |
Self insurance liability | 400 |  | 400 |  |  |
Deferred rents included in accounts receivable | $ 1,600 |  | $ 1,600 |  |  |
PAC Portfolio Acquisition [Member] |  |  |  |  |  |
Description of Business [Abstract] |  |  |  |  |  |
Rentable square feet of commercial real estate properties (in sq feet) | ft² | 1,630,000 |  | 1,630,000 |  |  |
Number of office properties acquired | propertyUnit | 4 |  | 4 |  |  |
Number of redevelopment properties acquired | propertyUnit | 1 |  | 1 |  |  |
Number of non-core assets acquired | propertyUnit | 2 |  | 2 |  |  |
Acquisition purchase price | $ 769,000 |  |  |  |  |
Near-term building improvements included in acquisition | 28,000 |  | $ 28,000 |  |  |
Transaction costs | $ 5,000 |  | $ 5,000 |  |  |
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 | 3.70% |  | 3.70% |  |  |
Term of debt instrument, in years | 10 years 9 months 18 days |  |  |  |  |
Percentage of total investment related to non-core assets | 12.00% |  | 12.00% |  |  |
Anticipated period of close date scheduled (in days) | 30 days |  | 30 days |  |  |
Earnest money deposits | $ 55,000 |  | $ 55,000 |  |  |
PAC Portfolio Acquisition [Member] | Subsequent Event [Member] |  |  |  |  |  |
Description of Business [Abstract] |  |  |  |  |  |
Earnest money deposits |  |  |  |  |  | $ 60,000
Highwoods Properties, Inc. [Member] |  |  |  |  |  |
Description of Business [Abstract] |  |  |  |  |  |
Common Units of partnership owned by the Company (in shares) | shares | 103,800,000 |  | 103,800,000 |  |  |
Percentage of ownership of Common Units (in hundredths) | 97.30% |  | 97.30% |  |  |
Common Units redeemed for a like number of common shares of stock (in shares) | shares |  |  | 1,000 |  |  |
Highwoods Properties, Inc. [Member] | ATM Equity Offering |  |  |  |  |  |
Description of Business [Abstract] |  |  |  |  |  |
Net proceeds of Common Stock sold during the period |  |  | $ 6,800 |  |  |
Number of Common Stock sold during the period (in shares) | shares |  |  | 149,100 |  |  |
Average price of Common Stock sold during the period (in dollars per share) | $ / shares |  |  | $ 46.11 |  |  |
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 |  |  |

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- Definition The anticipated period of time in which the acquisition will close, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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