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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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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