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Real Estate Assets (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 USD ($) parcel | Dec. 31, 2021 USD ($) ft² numberOfLoans numberOfOfficeBuildings numberOfBuildings | Dec. 31, 2020 USD ($) a numberOfBuildings parcel shares | Dec. 31, 2019 USD ($) ft² a parcel numberOfBuildings
Acquisitions [Abstract] |  |  |  |
Rentable square feet of commercial real estate (in square feet) | ft² |  | 28,000,000 |  |
Percentage of equity interest in joint ventures, maximum |  | 50.00% |  |
Dispositions [Abstract] |  |  |  |
Gains on disposition of property |  | $ 174,059 | $ 215,897 | $ 39,517
Impairments [Abstract] |  |  |  |
Impairments of real estate assets |  | 0 | 1,778 | 5,849
PAC Portfolio Acquisition [Member] |  |  |  |
Acquisitions [Abstract] |  |  |  |
Purchase price of acquisition |  | 653,600 |  |
Capitalized acquisition costs |  | $ 4,500 |  |
Number of loans assumed in acquisition | numberOfLoans |  | 4 |  |
150 Fayetteville Asset [Member] |  |  |  |
Acquisitions [Abstract] |  |  |  |
Rentable square feet of commercial real estate (in square feet) | ft² |  | 560,000 |  |
CAPTRUST Towers Asset [Member] |  |  |  |
Acquisitions [Abstract] |  |  |  |
Rentable square feet of commercial real estate (in square feet) | ft² |  | 300,000 |  |
Capitol Towers Asset [Member] |  |  |  |
Acquisitions [Abstract] |  |  |  |
Rentable square feet of commercial real estate (in square feet) | ft² |  | 479,000 |  |
Morrocroft Centre Asset [Member] |  |  |  |
Acquisitions [Abstract] |  |  |  |
Rentable square feet of commercial real estate (in square feet) | ft² |  | 291,000 |  |
Nashville TN Land Acquisitions [Member] |  |  |  |
Acquisitions [Abstract] |  |  |  |
Purchase price of acquisition | $ 16,000 | $ 74,100 |  |
Number of development parcels acquired (in parcels) | parcel | 1 |  |  |
Forum Portfolio Acquisition [Member] |  |  |  |
Acquisitions [Abstract] |  |  |  |
Purchase price of acquisition |  | $ 131,300 |  |
Percentage of partner's interest in asset acquired (in hundredths) |  | 75.00% |  |
Number of office properties acquired | numberOfOfficeBuildings |  | 5 |  |
Rentable square feet of commercial real estate (in square feet) | ft² |  | 636,000 |  |
Percentage of equity interest in joint ventures, maximum |  | 25.00% |  |
2020 Land Acquisitions [Member] |  |  |  |
Acquisitions [Abstract] |  |  |  |
Purchase price of acquisition |  |  | $ 8,500 |
Number of development parcels acquired (in parcels) | parcel |  |  | 2 |
Undeveloped land suitable for future development (in acres) | a |  |  | 1 |
Issuance of Common Units in acquisition (in units) | shares |  |  | 118,592 |
Submarket Acquisition [Member] |  |  |  |
Acquisitions [Abstract] |  |  |  |
Purchase price of acquisition |  |  |  | $ 399,100
Rentable square feet of commercial real estate (in square feet) | ft² |  |  |  | 841,000
2019 Land Acquisitions [Member] |  |  |  |
Acquisitions [Abstract] |  |  |  |
Purchase price of acquisition |  |  |  | $ 12,400
Number of development parcels acquired (in parcels) | parcel |  |  |  | 4
Undeveloped land suitable for future development (in acres) | a |  |  |  | 10
2021 Dispositions [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Number of buildings sold | numberOfBuildings |  | 13 |  |
Sale price of disposition |  | $ 384,600 |  |
Closing credits excluded for unfunded building and/or tenant improvements |  | 6,900 |  |
Gains on disposition of property |  | $ 172,800 |  |
2020 Dispositions [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Number of buildings sold | numberOfBuildings |  |  | 52 |
Sale price of disposition |  |  | $ 494,200 |
Closing credits excluded for unfunded building and/or tenant improvements |  |  | 5,700 |
Gains on disposition of property |  |  | 215,500 |
2019 Dispositions [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Number of buildings sold | numberOfBuildings |  |  |  | 6
Sale price of disposition |  |  |  | $ 136,400
Gains on disposition of property |  |  |  | 39,500
2016 Land Disposition [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Gains on disposition of property |  |  | 400 |
2020 Impairments [Member] |  |  |  |
Impairments [Abstract] |  |  |  |
Impairments of real estate assets |  |  | $ 1,800 |
2019 Impairments [Member] |  |  |  |
Impairments [Abstract] |  |  |  |
Impairments of real estate assets |  |  |  | $ 5,800

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