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Real Estate (Narrative) (Details) |  |  |  | 3 Months Ended
--- | --- | --- | --- | ---
May 05, 2021 USD ($) ft² ShoppingCenter | Feb. 24, 2021 USD ($) | Jul. 23, 2020 USD ($) Memberworkforce $ / ft² | Mar. 31, 2021 USD ($)
Real Estate Properties [Line Items] |  |  |  |
Gain on sale of property |  |  |  | $ 1,047,000
Outparcel Building Adjacent to Kempsville Crossing [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Proceeds from sale of outparcel building |  | $ 1,300,000 |  |
Outparcel Building Adjacent to Kempsville Crossing [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Operating Income [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Gain on sale of property |  | $ 1,000,000.0 |  |
Outparcel Building Adjacent to Kempsville Crossing [Member] | Subsequent Event [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Proceeds from sale of outparcel building | $ 9,800,000 |  |  |
Commercial Lease Agreement [Member] | Development Asset [Member] | Government of the District of Columbia (“District”) [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Lease agreement entered date |  |  | Jul. 23, 2020 |
Number of member workforce planned to house new office headquarters | Memberworkforce |  |  | 700 |
Term of lease |  |  | 20 years 10 months |
Initial annual net rent amount to be paid upon completion of building |  |  | $ 5,400,000 |
Annual escalator percentage to be paid on each anniversary of rent commencement |  |  | 2.50% |
Operating costs, property taxes and amortization of tenant improvements |  |  | $ 8,100,000 |
Annual net rent amount to be paid upon completion of building |  |  | $ 13,500,000 |
Free rent period |  |  | 10 months |
Tenant credit against either annual rent or any other tenant payment obligations including tenant improvement costs, in excess of tenant improvement allowance |  |  | $ 6,800,000 |
Amortized over period |  |  | 240 months |
Commercial Lease Agreement [Member] | Development Asset [Member] | Government of the District of Columbia (“District”) [Member] | Subsequent Event [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Area of commercial building | ft² | 258,000 |  |  |
Area of commercial space leased percentage | 100.00% |  |  |
Number of redevelopment of existing shopping centers | ShoppingCenter | 2 |  |  |
Initial term of construction loan | 3 years |  |  |
Percentage of interest in joint venture | 10.00% |  |  |
Commercial Lease Agreement [Member] | Development Asset [Member] | Government of the District of Columbia (“District”) [Member] | Subsequent Event [Member] | LIBOR Rate [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Construction loan initial interest | LIBOR plus 200 basis points |  |  |
Basis spread on borrowings variable rate | 200.00% |  |  |
Commercial Lease Agreement [Member] | Development Asset [Member] | Government of the District of Columbia (“District”) [Member] | Subsequent Event [Member] | Office Space [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Area of commercial building | ft² | 240,000 |  |  |
Commercial Lease Agreement [Member] | Development Asset [Member] | Government of the District of Columbia (“District”) [Member] | Subsequent Event [Member] | Street-Level Retail [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Area of commercial building | ft² | 18,000 |  |  |
Commercial Lease Agreement [Member] | Development Asset [Member] | Government of the District of Columbia (“District”) [Member] | Between the 10th and 12th Lease Years [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Additional per rentable square foot tenant improvement allowance to be contributed | $ / ft² |  |  | 9.38 |
Commercial Lease Agreement [Member] | Development Asset [Member] | Government of the District of Columbia (“District”) [Member] | Maximum [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Landlord contribution to be made per rentable square foot toward cost of tenant improvements | $ / ft² |  |  | 155 |
Commercial Lease Agreement [Member] | Development Asset [Member] | Government of the District of Columbia (“District”) [Member] | Maximum [Member] | Subsequent Event [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Construction financing maximum amount | $ 105,000,000 |  |  |

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