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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Mortgage Receivable and Notes Receivable (Details)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 20 Months Ended
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Aug. 31, 2017
USD ($)
property
Jun. 30, 2020
USD ($)
community
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
community
Jul. 31, 2017
USD ($)
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE                
Loans receivable, communities remaining in the pool of assets used to secure the mortgage | community       12     12  
Multi-Family Residential | Discontinued Operations, Disposed of by Sale                
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE                
Number of real estate properties sold | property     13          
Interest income         $ 279 $ 285    
Multi-Family Residential | Mortgage receivable                
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE                
Loans receivable   $ 10,000 $ 11,000 $ 10,000 10,000   $ 10,000  
Ironwood | Multi-Family Residential                
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE                
Loans receivable   16,600         16,600  
Loan commitment               $ 16,200
Loan commitment, additional funds authorized               $ 341
Minneapolis, Minnesota | Multi-Family Residential                
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE                
Loans receivable   $ 6,200   $ 11,000 $ 11,000   6,200  
Construction Loans | Minneapolis, Minnesota | Multi-Family Residential                
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE                
Interest rate   4.50%            
Loan commitment   $ 29,900         29,900  
Mezzanine Loan | Minneapolis, Minnesota | Multi-Family Residential                
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE                
Interest rate   11.50%            
Loan commitment   $ 15,300         $ 15,300  
Tax Increment Financing | Ironwood | Multi-Family Residential                
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE                
Interest rate 4.50%              
Loan commitment $ 6,600