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DEBT - Narrative (Details)
 12 Months Ended
Dec. 31, 2020
USD ($)
property
extension
loan
Dec. 31, 2019
USD ($)
Line of Credit Facility [Line Items]    
Number of real estate properties, unencumbered by mortgages | property 47  
Number of real estate properties, unencumbered used to provide credit support | property 34  
Maximum borrowing capacity $ 6,000,000.0  
Revolving lines of credit $ 152,871,000 $ 50,079,000
Number of real estate communities, serving as collateral for mortgage loans | property 20  
Domestic Line of Credit | Base Rate | Minimum    
Line of Credit Facility [Line Items]    
Interest rate spread (as a percent) 0.35%  
Domestic Line of Credit | Base Rate | Maximum    
Line of Credit Facility [Line Items]    
Interest rate spread (as a percent) 0.85%  
Domestic Line of Credit | London Interbank Offered Rate (LIBOR) | Minimum    
Line of Credit Facility [Line Items]    
Interest rate spread (as a percent) 1.35%  
Domestic Line of Credit | London Interbank Offered Rate (LIBOR) | Maximum    
Line of Credit Facility [Line Items]    
Interest rate spread (as a percent) 1.90%  
BMO Line of Credit | Lines of credit    
Line of Credit Facility [Line Items]    
Maximum borrowing capacity $ 250,000,000.0 250,000,000.0
Revolving lines of credit   $ 50,100,000
Number of extensions | extension 1  
Extension term 12 months  
BMO Line of Credit | Domestic Line of Credit    
Line of Credit Facility [Line Items]    
Remaining borrowing capacity $ 97,100,000  
Revolving lines of credit $ 152,900,000  
Operating line of credit, interest rate 2.85%  
Mortgages payable    
Line of Credit Facility [Line Items]    
Number of loans in default | loan 0  
Mortgages payable | Minimum    
Line of Credit Facility [Line Items]    
Mortgage loans, interest rate 3.47%  
Mortgages payable | Maximum    
Line of Credit Facility [Line Items]    
Mortgage loans, interest rate 5.73%  
Unsecured debt    
Line of Credit Facility [Line Items]    
Maximum borrowing capacity $ 150,000,000.0  
Remaining borrowing capacity 25,000,000.0  
Unsecured debt | Term Loan Maturing 2024    
Line of Credit Facility [Line Items]    
Original principal balance 70,000,000.0  
Unsecured debt | Term Loan Maturing 2025    
Line of Credit Facility [Line Items]    
Original principal balance 75,000,000.0  
Unsecured debt | Note Maturing 2029    
Line of Credit Facility [Line Items]    
Original principal balance $ 75,000,000.0  
Interest rate percentage 3.84%  
Unsecured debt | Note Maturing 2028    
Line of Credit Facility [Line Items]    
Original principal balance $ 50,000,000.0  
Interest rate percentage 3.69%