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Acquisition, Dispositions and Assets Held for Sale (Details)
$ in Thousands
Sep. 30, 2021
USD ($)
ft²
Dec. 31, 2020
USD ($)
ft²
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Assets held for sale $ 74,174 $ 73,876
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 $ 74,174 $ 73,876