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Real Estate Assets (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 USD ($) ft² | Mar. 31, 2021 USD ($) ft² propertyUnit | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) ft² | Jun. 30, 2020 USD ($)
Acquisitions [Abstract] |  |  |  |  |
Rentable square feet of commercial real estate properties (in sq feet) | ft² | 27,300,000 |  |  | 27,300,000 |
Dispositions [Abstract] |  |  |  |  |
Gains on disposition of property | $ 22,862 |  | $ 318 | $ 41,799 | $ 153,385
Nashville TN Land Acquisition [Member] |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |
Acquisition purchase price | 16,100 |  |  |  |
Forum Buildings Acquisition |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |
Acquisition purchase price |  | $ 131,300 |  |  |
Percentage of partner's interest in asset acquired (in hundredths) |  | 75.00% |  |  |
Number of buildings sold | propertyUnit |  | 5 |  |  |
Rentable square feet of commercial real estate properties (in sq feet) | ft² |  | 636,000 |  |  |
Percentage of equity interest in joint venture (in hundredths) |  | 25.00% |  |  |
2021 Dispositions |  |  |  |  |
Dispositions [Abstract] |  |  |  |  |
Purchase price of real estate | 43,000 | $ 30,700 |  |  |
Closing credits excluded for unfunded building and/or tenant improvements | 900 |  |  |  |
Gains on disposition of property | $ 22,900 | $ 18,900 |  |  |

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