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Real Estate Assets (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2022 USD ($) | Jun. 30, 2022 USD ($) ft² | Jun. 30, 2023 USD ($) parcel | Dec. 31, 2023 USD ($) ft² numberOfBuildings | Dec. 31, 2022 USD ($) ft² numberOfBuildings | Dec. 31, 2021 USD ($) ft² numberOfLoans numberOfOfficeBuildings numberOfBuildings
Acquisitions [Abstract] |  |  |  |  |  |
Rentable square feet of commercial real estate (in square feet) | ft² |  |  |  | 28,400,000 |  |
Percentage of equity interest in joint ventures, maximum |  |  |  | 50.00% |  |
Dispositions [Abstract] |  |  |  |  |  |
Gains on disposition of property |  |  |  | $ 47,773 | $ 63,546 | $ 174,059
Impairments [Abstract] |  |  |  |  |  |
Impairments of real estate assets |  |  |  | 0 | $ 36,515 | 0
Raleigh NC Land Acquisition |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |
Purchase price of acquisition |  |  |  | $ 2,700 |  |
SIX50 at Legacy Union [Member] |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |
Rentable square feet of commercial real estate (in square feet) | ft² |  |  |  |  | 367,000 |
Purchase price of acquisition |  |  |  |  | $ 198,000 |
Charlotte NC Land Acquisition [Member] |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |
Purchase price of acquisition |  |  |  |  | $ 27,000 |
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] |  |  |  |  |  |
Rentable square feet of commercial real estate (in square feet) | ft² |  |  |  |  |  | 636,000
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
Percentage of equity interest in joint ventures, maximum |  |  |  |  |  | 25.00%
2023 Dispostions |  |  |  |  |  |
Dispositions [Abstract] |  |  |  |  |  |
Number of buildings sold | numberOfBuildings |  |  |  | 4 |  |
Sales price of disposition |  |  |  | $ 103,800 |  |
Gains on disposition of property |  |  |  | 47,800 |  |
2022 Dispositions [Member] |  |  |  |  |  |
Dispositions [Abstract] |  |  |  |  |  |
Number of buildings sold | numberOfBuildings |  |  |  |  | 5 |
Sales price of disposition |  |  |  |  | $ 133,500 |
Closing credits excluded for unfunded building and/or tenant improvements |  |  |  |  | 1,100 |
Gains on disposition of property |  |  |  |  | $ 63,500 |
2021 Dispositions [Member] |  |  |  |  |  |
Dispositions [Abstract] |  |  |  |  |  |
Number of buildings sold | numberOfBuildings |  |  |  |  |  | 13
Sales price of disposition |  |  |  |  |  | $ 384,600
Closing credits excluded for unfunded building and/or tenant improvements |  |  |  |  |  | 6,900
Gains on disposition of property |  |  |  |  |  | $ 172,800
Seller Financed Transaction [Member] |  |  |  |  |  |
Dispositions [Abstract] |  |  |  |  |  |
Sales price of disposition |  |  |  | 21,000 |  |
Seller Financing [Abstract] |  |  |  |  |  |
Proceeds from sale of real estate |  |  |  | 2,000 |  |
Non-recourse seller financing |  |  |  | $ 19,000 |  |
Term of debt instrument |  |  |  | 2 years |  |
Interest rate basis |  |  |  | SOFR |  |
Interest rate, basis spread (in hundredths) |  |  |  | 1.00% |  |
2022 Impairments [Member] |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |
Rentable square feet of commercial real estate (in square feet) | ft² |  | 616,000 |  |  |  |
Impairments [Abstract] |  |  |  |  |  |
Impairments of real estate assets | $ 1,500 | $ 35,000 |  |  |  |
Square footage occupied by customer (in sq feet) | ft² |  | 317,000 |  |  |  |

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