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Disposition and Assets Held for Sale (Details)
$ in Thousands
3 Months Ended
Jan. 15, 2020
USD ($)
ft²
Mar. 31, 2020
USD ($)
ft²
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
ft²
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Proceeds from sale of real estate   $ 154,493 $ 117,676  
Gain on sale of real estate   59,477 39,033  
Assets held for sale   73,876   $ 168,412
Liabilities related to assets held for sale   $ 213    
Arlington, Virginia        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Area of real estate property (in square feet) | ft²       4,230
Assets held for sale       $ 168,412
Arlington, Virginia | Metropolitan Park        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Area of real estate property (in square feet) | ft² 2,150     2,150
Gross sales price $ 154,952      
Proceeds from sale of real estate 154,493      
Gain on sale of real estate $ 59,477      
Assets held for sale       $ 94,517
Arlington, Virginia | Pen Place - Land Parcel        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Area of real estate property (in square feet) | ft²   2,080   2,080
Gross sales price     $ 149,900  
Assets held for sale   $ 73,876   $ 73,895
Liabilities related to assets held for sale   $ 213