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Real Estate (Narrative) (Details) |  |  |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | ---
Oct. 08, 2020 USD ($) | Sep. 17, 2020 USD ($) | Jul. 23, 2020 USD ($) Memberworkforce $ / ft² | Jul. 09, 2020 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($)
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Gain on sale of property |  |  |  |  | $ 679,000 |  | $ 679,000 | $ 2,942,000
Proceeds from sale of property held-for-sale |  |  |  | $ 4,300,000 |  |  |  |
Total revenues |  |  |  |  | $ 31,175,000 | $ 35,912,000 | 102,280,000 | $ 108,455,000
Impairment charges |  |  |  |  |  |  | 7,607,000 |
Contract Termination [Member] |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Impairment charges |  |  |  |  |  |  | 7,600,000 |
Other Income [Member] | Contract Termination [Member] |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  | $ 7,100,000 |
Outparcel Building Adjacent to Oakland Mills [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member] |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale of outparcel building |  | $ 1,100,000 |  |  |  |  |  |
Outparcel Building Adjacent to Oakland Mills [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Operating Income [Member] |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Gain on sale of property |  | $ 700,000 |  |  |  |  |  |
Glen Allen Shopping Center [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale of property held-for-sale | $ 8,500,000 |  |  |  |  |  |  |
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 |  |  |  |  |
Lessor, operating lease not yet commenced, Description |  |  |  |  |  |  | The Company anticipates commencement of construction to occur in the first quarter of 2021 and currently estimates that the space will be delivered during the end of the fourth quarter 2022 |
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] | 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 |  |  |  |  |

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