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Real Estate Investment - Property Disposition (Details) - USD ($) $ in Thousands |  |  |  |  | 3 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 18, 2021 | Mar. 16, 2021 | Jan. 14, 2021 | Jan. 04, 2021 | Mar. 31, 2021 | Mar. 31, 2020
Real Estate Properties [Line Items] |  |  |  |  |  |
Proceeds from sale of real estate held-for-investment |  |  |  |  | $ 9,156 | $ 1,442
Repayments of loan |  |  |  |  | $ 5,501 | $ 7,971
Hanbury Village | Disposed of by Sale |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Proceeds from sale of real estate held-for-investment |  |  |  | $ 2,900 |  |
Gain (loss) on disposition of property |  |  |  | $ 2,400 |  |
Nexton Square | Disposed of by Sale |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Proceeds from sale of real estate held-for-investment |  |  | $ 900 |  |  |
Repayments of loan |  |  | $ 800 |  |  |
Oakland Marketplace | Disposed of by Sale |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Proceeds from sale of real estate held-for-investment |  | $ 5,500 |  |  |  |
Gain (loss) on disposition of property |  | $ 1,100 |  |  |  |
Courthouse 7-Eleven | Disposed of by Sale |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Proceeds from sale of real estate held-for-investment | $ 300 |  |  |  |  |
Gain (loss) on disposition of property | $ 200 |  |  |  |  |

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