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EQUITY AND MEZZANINE EQUITY - Additional Information (Details)
 3 Months Ended
Sep. 01, 2021
USD ($)
apartmentCommunity
$ / shares
shares
Feb. 26, 2019
USD ($)
$ / shares
Mar. 31, 2022
USD ($)
apartmentCommunity
$ / shares
shares
Mar. 31, 2021
USD ($)
shares
Dec. 31, 2021
USD ($)
$ / shares
shares
Sep. 30, 2021
USD ($)
Dec. 31, 2019
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Noncontrolling interests , operating partnership, outstanding (in shares)     997,000   832,000    
Noncontrolling interests , operating partnership, issued (in shares)     209,000        
Preferred shares, shares issued (in shares)     3,881,000   3,881,000    
Preferred shares liquidation preference | $     $ 97,036,000   $ 97,036,000    
Common stock outstanding (in shares)     15,366,000   15,016,000    
Sale / issuance of stock | $     $ 31,684,000 $ 11,782,000      
Preferred shares of beneficial interest, shares outstanding (in shares)     3,881,000   3,881,000    
Preferred shares, liquidation preference (in dollars per share) | $ / shares     $ 25   $ 25    
Preferred units, shares issued (in shares)     166,000   166,000    
Preferred units, par value (in dollars per share) | $ / shares     $ 100   $ 100    
Preferred units, liquidation preference | $     $ 16,560,000   $ 16,560,000    
2022 Acquisitions, Three Apartment Communities              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of properties acquired | apartmentCommunity     3        
2021 Acquisitions              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of properties acquired | apartmentCommunity 17            
Series E Preferred Units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Preferred shares, shares issued (in shares) 1,800,000            
Preferred units, par value (in dollars per share) | $ / shares $ 100            
Preferred units, conversion ratio 1.2048            
Preferred shares liquidation preference | $ $ 181,400,000            
Preferred shares, dividend rate 0.03875%            
Series C Preferred Shares              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Preferred shares liquidation preference | $     $ 97,000,000        
Preferred shares of beneficial interest, shares outstanding (in shares)     3,900,000   3,900,000    
Preferred shares, liquidation preference (in dollars per share) | $ / shares     $ 25.00        
Preferred shares, annual distribution accrual rate (in dollars per share) | $ / shares     $ 1.65625        
Preferred shares, dividend rate     6.625%        
Series D Preferred Units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Preferred units, shares issued (in shares)     165,600   165,600    
Preferred units, par value (in dollars per share) | $ / shares   $ 100          
Distribution rate   3.862%          
Units converted, ratio   1.37931          
Preferred units, liquidation preference | $   $ 16,600,000          
At-The-Market Offering              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Aggregate gross sales price of common shares, authorized amount | $           $ 250,000,000 $ 150,000,000
Aggregate gross sales price of common shares, remaining authorized amount | $     $ 126,600,000        
2015 Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Equity awards issued (in shares)     18,759 2,801      
Sale / issuance of stock | $     $ 1,500,000 $ 164,000