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MEZZANINE EQUITY AND EQUITY - Narrative (Details) |  |  | 3 Months Ended | 6 Months Ended |  |  |
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Jun. 30, 2025 USD ($) quarter $ / shares shares | Sep. 30, 2024 USD ($) $ / shares | Jun. 30, 2025 USD ($) quarter $ / shares shares | Jun. 30, 2024 USD ($) shares | Jun. 30, 2025 USD ($) quarter $ / shares shares | Jun. 30, 2024 USD ($) shares | Dec. 31, 2024 USD ($) $ / 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 | 113,000 |  | 113,000 |  | 113,000 |  | 166,000 |  |
Preferred units, par value (in dollars per share) | $ / shares | $ 100 |  | $ 100 |  | $ 100 |  | $ 100 |  |
Preferred units, liquidation preference | $ 11,310,000 |  | $ 11,310,000 |  | $ 11,310,000 |  |  |  |
Noncontrolling interests , operating partnership, outstanding (in shares) | shares | 968,000 |  | 968,000 |  | 968,000 |  | 980,000 |  |
Common shares of beneficial interest, shares outstanding (in shares) | shares | 16,757,000 |  | 16,757,000 |  | 16,757,000 |  | 16,719,000 |  |
Sale of common shares, net |  |  |  | $ 7,320,000 |  | $ 7,320,000 |  |  |
Share repurchase program, authorized amount |  |  |  |  |  |  |  |  | $ 50,000,000
Number of common shares (in shares) | shares |  |  | 0 |  | 0 |  |  |  |
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 |  | 500,000,000.0 |  |  |  |
Aggregate gross sales price of common shares, remaining authorized amount | $ 262,900,000 |  | $ 262,900,000 |  | $ 262,900,000 |  |  |  |
2015 Incentive Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Equity awards issued (in shares) | shares |  |  | 9,835 | 9,723 | 17,653 | 13,465 |  |  |
Sale of common shares, net |  |  | $ 677,000 | $ 584,000 | $ 1,500,000 | $ 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 | 113,100 |  | 113,100 |  | 113,100 |  | 165,600 |  |
Preferred units, par value (in dollars per share) | $ / shares | $ 100 |  | $ 100 |  | $ 100 |  | $ 100 |  |
Distribution rate |  |  |  |  | 3.862% |  |  |  |
Shares redeemed (in shares) | shares | 52,500 |  |  |  |  |  |  |  |
Payment for redemption of preferred stock |  |  |  |  | $ 5,300,000 |  |  |  |
Units converted, ratio |  |  |  |  | 1.37931 |  |  |  |
Preferred units, liquidation preference | $ 11,300,000 |  | $ 11,300,000 |  | $ 11,300,000 |  | $ 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 |
Redemption of preferred shares |  | $ 3,500,000 |  |  |  |  |  |  |
Preferred shares of beneficial interest, shares outstanding (in shares) | shares | 0 |  | 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 |  | 1,600,000 |  |
Preferred shares, dividend rate |  |  |  |  | 3.875% |  |  |  |
Preferred units, par value (in dollars per share) | $ / shares | $ 100 |  | $ 100 |  | $ 100 |  | $ 100 |  |
Preferred units, conversion ratio | 1.20482 |  | 1.20482 |  | 1.20482 |  |  |  |
Preferred units, conversion exchange rate, minimum threshold (in dollars per share) | $ / shares | $ 83 |  | $ 83 |  | $ 83 |  |  |  |
Preferred stock, threshold trading days | 15 days |  | 15 days |  | 15 days |  |  |  |
Preferred stock, threshold consecutive trading days | 30 days |  | 30 days |  | 30 days |  |  |  |
Number of consecutive distribution periods | quarter | 3 |  | 3 |  | 3 |  |  |  |
Minimum distribution rate (in dollars per share) | $ / shares | $ 0.804 |  | $ 0.804 |  | $ 0.804 |  |  |  |
Preferred shares liquidation preference | $ 157,500,000 |  | $ 157,500,000 |  | $ 157,500,000 |  | $ 158,200,000 |  |

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