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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
Aug. 31, 2017
USD ($)
property
Jun. 30, 2019
USD ($)
community
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jul. 31, 2017
USD ($)
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE            
Mortgage loans receivable $ 11,000 $ 10,100   $ 10,100    
Loans receivable, communities remaining in the pool of assets used to secure the mortgage | community   12        
Interest income   $ 402 $ 429 809 $ 1,102  
Multi-Family Residential            
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE            
Interest rate   6.00%        
Loan commitment           $ 16,200
Loans receivable   $ 16,600   16,600    
Discontinued Operations, Disposed of by Sale | Multi-Family Residential            
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE            
Number of real estate properties sold | property 13          
Interest rate   5.50%        
Interest income       $ 285 $ 305