Quarterly report pursuant to Section 13 or 15(d)

Nature of Business - Disposal Group (Details)

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Nature of Business - Disposal Group (Details) - Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] - Office [Member] - ft²
ft² in Thousands
Sep. 30, 2018
Mar. 31, 2018
M Street 2445 [Member]    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Square footage of office property sold   292
2018 Properties Sold Group [Member]    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Square footage of office property sold 648  
2018 Properties Sold Group [Member] | Braddock Metro Center [Member]    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Square footage of office property sold 356  
2018 Properties Sold Group [Member] | M Street 2445 [Member]    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Square footage of office property sold 292