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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Real Estate Investments (Details)
12 Months Ended
Dec. 31, 2023
USD ($)
apartmentCommunity
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Real Estate Properties [Line Items]      
Real estate investments $ 1,889,443,000 $ 1,998,723,000  
Construction period interest capitalized 0 0 $ 0
Impairment of real estate investments $ 5,218,000 $ 0 $ 0
Number of apartment communities impaired during year | apartmentCommunity 2    
Richfield, MN      
Real Estate Properties [Line Items]      
Impairment of real estate investments $ 3,000,000    
New Hope, MN      
Real Estate Properties [Line Items]      
Impairment of real estate investments $ 2,200,000    
Minimum | Buildings and Improvements      
Real Estate Properties [Line Items]      
Estimated useful life of assets (in years) 10 years    
Minimum | Furniture, Fixtures and Equipment      
Real Estate Properties [Line Items]      
Estimated useful life of assets (in years) 5 years    
Minimum | Renovations and Improvements      
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 | Furniture, Fixtures and Equipment      
Real Estate Properties [Line Items]      
Estimated useful life of assets (in years) 10 years    
Maximum | Renovations and Improvements      
Real Estate Properties [Line Items]      
Estimated useful life of assets (in years) 20 years