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Real Estate Assets (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) ft² numberOfOfficeBuildings | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) ft² numberOfBuildings | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) ft² numberOfOfficeBuildings | Sep. 30, 2020 USD ($)
Acquisitions [Abstract] |  |  |  |  |  |
Rentable square feet of commercial real estate properties (in sq feet) | ft² | 29,000,000 |  |  |  | 29,000,000 |
Dispositions [Abstract] |  |  |  |  |  |
Gains on disposition of property | $ 38,572 |  |  | $ 10,012 | $ 80,371 | $ 163,397
Nashville TN Land Acquisitions [Member] |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |
Acquisition purchase price | $ 22,900 | $ 16,100 |  |  |  |
Expected term of purchase price payment (in years) |  | 2 years |  |  |  |
Forum Buildings Acquisition [Member] |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |
Acquisition purchase price |  |  | $ 131,300 |  |  |
Percentage of partner's interest in asset acquired (in hundredths) |  |  | 75.00% |  |  |
Number of buildings acquired | numberOfBuildings |  |  | 5 |  |  |
Rentable square feet of commercial real estate properties (in sq feet) | ft² |  |  | 636,000 |  |  |
Dispositions [Abstract] |  |  |  |  |  |
Percentage of equity interest in joint venture (in hundredths) |  |  | 25.00% |  |  |
2021 Dispositions |  |  |  |  |  |
Dispositions [Abstract] |  |  |  |  |  |
Number of buildings sold | numberOfOfficeBuildings | 2 |  |  |  | 2 |
Sale price of real estate | $ 119,700 | $ 43,000 | $ 30,700 |  |  |
Closing credits excluded for unfunded building and/or tenant improvements | 4,400 | 900 |  |  |  |
Gains on disposition of property | $ 37,300 | $ 22,900 | $ 18,900 |  |  |
Markel Land Disposition [Member] |  |  |  |  |  |
Dispositions [Abstract] |  |  |  |  |  |
Percentage of equity interest in joint venture (in hundredths) | 50.00% |  |  |  | 50.00% |
Joint venture sale price of real estate | $ 3,000 |  |  |  |  |
Joint venture gain on disposition of property | $ 1,300 |  |  |  |  |

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