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Assets Held for Sale (Details) $ in Thousands | Mar. 31, 2021 USD ($) ft² | Dec. 31, 2020 USD ($) ft²
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Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Assets held for sale | $ 73,876 | $ 73,876
Liabilities related to assets held for sale | $ 213 |
Disposal Group, Held-for-sale | Pen Place | Arlington, Virginia |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Area of real estate property | ft² | 2,082 | 2,082
Assets held for sale | $ 73,876 | $ 73,876
Liabilities related to assets held for sale | $ 213 |

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