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EQUITY AND MEZZANINE EQUITY - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Dec. 05, 2019
Feb. 26, 2019
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Nov. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Noncontrolling interests - operating partnership (in shares)     1,022,000   1,022,000   1,058,000  
Common stock outstanding (in shares)     12,827,000   12,827,000   12,098,000  
Sale of common shares, net     $ 44,789,000   $ 48,141,000      
Repurchase period 1 year              
Remaining authorized repurchase amount     $ 44,400,000   $ 44,400,000      
Preferred shares of beneficial interest, shares outstanding (in shares)     3,900,000   3,900,000   4,100,000  
Preferred shares, liquidation preference (in dollars per share)     $ 25.00   $ 25.00      
Preferred shares, annual distribution accrual rate (in dollars per share)         $ 1.65625      
Preferred shares, dividend rate         6.625%      
Preferred shares liquidation preference     $ 97,100,000   $ 97,100,000      
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   166,000   166,000  
Preferred units, par value (in dollars per share)   $ 100 $ 100   $ 100   $ 100  
Distribution rate   3.862%            
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     $ 79,500,000   $ 79,500,000     $ 150,000,000.0
2015 Incentive Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Equity awards issued (in shares)     19,508 6,511 20,701 6,718    
Sale of common shares, net     $ 956,000 $ 447,000 $ 1,000,000.0 $ 457,000