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Real Estate Investments - Textual (Details) $ in Thousands |  |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 06, 2021 USD ($) parcel | Feb. 02, 2021 USD ($) | Jun. 30, 2021 USD ($) a parcel | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) a parcel | Jun. 30, 2020 USD ($) | Feb. 02, 2021 ft² | Feb. 02, 2021 a | Dec. 31, 2020 USD ($) a parcel
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Investment in joint venture |  |  | $ 422,333 |  | $ 422,333 |  |  |  | $ 389,811
Net gain on sale of undepreciated real estate |  |  | 0 | $ 201 | 1,993 | $ 201 |  |  |
Assets held for sale, net |  |  | 7,349 |  | 7,349 |  |  |  | 7,349
Other - Land | Held-for-sale |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Assets held for sale, net |  |  | $ 7,300 |  | $ 7,300 |  |  |  | $ 7,300
Other - Land | Held-for-sale | Other |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Area of land (in acres) | a |  |  | 35.2 |  | 35.2 |  |  |  | 35.2
Number of parcels of land | parcel |  |  | 2 |  | 2 |  |  |  | 2
Other - Land | Held-for-sale | Other | Subsequent Event |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Number of parcels of land sold | parcel | 2 |  |  |  |  |  |  |  |
Proceeds from sale of land | $ 8,900 |  |  |  |  |  |  |  |
3025 JFK Venture |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Lease agreement term |  | 99 years |  |  |  |  |  |  |
Area of land (in acres) |  |  |  |  |  |  | 1 | 1 |
Investment in joint venture |  | $ 34,800 |  |  |  |  |  |  |
Net gain on sale of undepreciated real estate |  | $ 2,000 |  |  |  |  |  |  |

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