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MEZZANINE EQUITY AND EQUITY - Narrative (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2024
USD ($)
$ / shares
Sep. 30, 2025
USD ($)
quarter
$ / shares
shares
Sep. 30, 2024
USD ($)
$ / shares
shares
Sep. 30, 2025
USD ($)
quarter
$ / shares
shares
Sep. 30, 2024
USD ($)
$ / shares
shares
Jul. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
$ / shares
shares
Aug. 30, 2024
$ / shares
shares
Mar. 10, 2022
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Preferred units, shares issued (in shares) | shares   59,000   59,000     166,000    
Preferred units, par value (in dollars per share) | $ / shares   $ 100   $ 100     $ 100    
Preferred units, liquidation preference   $ 5,940,000   $ 5,940,000          
Redemption of preferred shares   $ 0 $ (3,511,000) $ 0 $ (3,511,000)        
Noncontrolling interests , operating partnership, outstanding (in shares) | shares   963,000   963,000     980,000    
Common shares of beneficial interest, shares outstanding (in shares) | shares   16,703,000   16,703,000     16,719,000    
Sale of common shares, net     $ 104,831,000   $ 112,151,000        
Share repurchase program, authorized amount           $ 100,000,000.0     $ 50,000,000
Remaining available repurchase amount   $ 96,500,000   $ 96,500,000          
At-The-Market Offering                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Sale of common shares, net   0   0          
Aggregate gross sales price of common shares, authorized amount   500,000,000.0   500,000,000.0          
Aggregate gross sales price of common shares, remaining authorized amount   $ 262,900,000   $ 262,900,000          
2015 Incentive Plan and 2025 Incentive Plan                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Equity awards issued (in shares) | shares   82   17,735          
Sale of common shares, net   $ 6,000   $ 1,500,000          
2015 Incentive Plan                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Equity awards issued (in shares) | shares     46   13,511        
Sale of common shares, net     $ 4,000   $ 1,000,000.0        
Series D Preferred Units                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Preferred units, shares issued (in shares) | shares   59,400   59,400     165,600    
Preferred units, par value (in dollars per share) | $ / shares   $ 100   $ 100     $ 100    
Distribution rate       3.862%          
Shares redeemed (in shares) | shares   53,700   106,200          
Payment for redemption of preferred stock   $ 5,400,000   $ 10,600,000          
Units converted, ratio       1.37931          
Preferred units, liquidation preference   $ 5,900,000   $ 5,900,000     $ 16,600,000    
Series C Preferred Shares Of Beneficial Interest                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Payment for redemption of preferred stock $ 97,000,000.0                
Number of shares redemption intended (in shares) | shares               3,900,000  
Preferred shares, liquidation preference (in dollars per share) | $ / shares $ 25   $ 25   $ 25     $ 25  
Redemption of preferred shares $ 3,500,000                
Preferred shares of beneficial interest, shares outstanding (in shares) | shares   0   0     0    
Preferred shares, annual distribution accrual rate (in dollars per share) | $ / shares $ 1.65625                
Preferred shares, dividend rate 6.625%                
Series E Preferred Units                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Preferred shares of beneficial interest, shares outstanding (in shares) | shares   1,600,000   1,600,000     1,600,000    
Preferred shares, dividend rate       3.875%          
Preferred units, par value (in dollars per share) | $ / shares   $ 100   $ 100     $ 100    
Preferred units, conversion ratio   1.20482   1.20482          
Preferred units, conversion exchange rate, minimum threshold (in dollars per share) | $ / shares   $ 83   $ 83          
Preferred stock, threshold trading days   15 days   15 days          
Preferred stock, threshold consecutive trading days   30 days   30 days          
Number of consecutive distribution periods | quarter   3   3          
Minimum distribution rate (in dollars per share) | $ / shares   $ 0.804   $ 0.804          
Preferred shares liquidation preference   $ 157,200,000   $ 157,200,000     $ 158,200,000