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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Real Estate Investments (Details) $ in Thousands | 8 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Apr. 30, 2018 USD ($) property
Real Estate Properties [Line Items] |  |  |  |  |
Total real estate investments |  | $ 1,437,969 | $ 1,311,472 |  |
Construction period interest capitalized |  |  |  |  | $ 4
Impairment of real estate continuing and discontinued operations | $ 1,221 | $ 0 | $ 0 | $ 1,200 | $ 18,065
Apartment Properties |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of impaired properties | property |  |  |  |  | 1
Apartment Properties | Grand Forks, North Dakota |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Impairment of real estate continuing and discontinued operations |  |  |  |  | $ 12,200
Commercial Properties |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of impaired properties | property |  |  |  |  | 3
Land |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of impaired properties | property |  |  |  |  | 4
Land | Grand Forks, North Dakota |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Impairment of real estate continuing and discontinued operations |  |  |  |  | $ 1,500
Land | Williston, ND |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Impairment of real estate continuing and discontinued operations |  |  |  |  | 428
Land | Bismark, North Dakota - First Property |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Impairment of real estate continuing and discontinued operations |  |  |  |  | 256
Land | Bismark, North Dakota - Second Property |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Impairment of real estate continuing and discontinued operations |  |  |  |  | $ 709
Land | Bismark, North Dakota |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of impaired properties | property |  |  |  |  | 2
Industrial | Bloomington, Minnesota |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Impairment of real estate continuing and discontinued operations |  |  |  |  | $ 1,400
Industrial | Woodbury, Minnesota |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Impairment of real estate continuing and discontinued operations |  |  |  |  | 922
Retail Site | Minot, ND |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Impairment of real estate continuing and discontinued operations |  |  |  |  | $ 630
Minimum | Buildings and Improvements |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Estimated useful life of assets (in years) |  | 10 years |  |  |
Minimum | Renovations and Improvements |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Estimated useful life of assets (in years) |  | 5 years |  |  |
Minimum | Furniture, Fixtures and Equipment |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Estimated useful life of assets (in years) |  | 5 years |  |  |
Maximum | Buildings and Improvements |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Estimated useful life of assets (in years) |  | 37 years |  |  |
Maximum | Renovations and Improvements |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Estimated useful life of assets (in years) |  | 20 years |  |  |
Maximum | Furniture, Fixtures and Equipment |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Estimated useful life of assets (in years) |  | 10 years |  |  |

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