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EQUITY AND MEZZANINE EQUITY - Additional Information (Details) - USD ($)
3 Months Ended
Dec. 05, 2019
Feb. 26, 2019
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Nov. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Noncontrolling interests - operating partnership (in shares)     950,000   977,000  
Common stock outstanding (in shares)     13,220,000   13,027,000  
Sale of common shares, net     $ 11,782,000 $ 3,352,000    
Repurchase period 1 year          
Preferred shares of beneficial interest, shares outstanding (in shares)     3,900,000   3,900,000  
Preferred shares, annual distribution accrual rate (in dollars per share)     $ 1.65625      
Preferred shares, dividend rate     6.625%      
Preferred shares liquidation preference     $ 97,000,000.0      
Partnership units, converted (in shares)   1.37931        
Conversion price (in dollars per share)   $ 72.50        
Series D Preferred Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Preferred units, shares issued (in shares)   165,600 166,000      
Preferred units, par value (in dollars per share)   $ 100 $ 100   $ 100  
Distribution rate   3.862%        
Series C Preferred Shares Of Beneficial Interest            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Preferred shares of beneficial interest, shares outstanding (in shares)     3,881,000   3,881,000  
Preferred shares, liquidation preference (in dollars per share)     $ 25.00   $ 25.00  
Preferred shares liquidation preference     $ 97,036,000   $ 97,036,000  
Share Repurchase Program            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Aggregate gross sales price of common share of beneficial interest allowed to be repurchased $ 50,000,000          
At-The-Market Offering            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Aggregate gross sales price of common shares     $ 55,300,000     $ 150,000,000.0
2015 Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Equity awards issued (in shares)     2,801 1,193    
Sale of common shares, net     $ 164,000 $ 125,000