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EQUITY AND MEZZANINE EQUITY - Narrative (Details) |  |  | 12 Months Ended |  |
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Sep. 01, 2021 qtr apartmentUnit $ / shares shares | Oct. 02, 2017 $ / shares shares | Dec. 31, 2022 USD ($) apartmentCommunity $ / shares shares | Dec. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) | Dec. 31, 2022 shares | Dec. 31, 2022 USD ($) | Dec. 31, 2022 apartmentCommunity | Dec. 31, 2022 apartmentProperty | Mar. 10, 2022 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Noncontrolling interests - operating partnership (in shares) | shares |  |  |  | 832,000 |  | 971,000 |  |  |  |
Noncontrolling interests , operating partnership, issued (in shares) | shares |  |  | 209,000 |  |  |  |  |  |  |
Preferred units, shares issued (in shares) | shares |  |  |  | 3,881,000 |  | 3,881,000 |  |  |  |
Number of properties |  |  |  |  |  |  |  | 84 | 37 |
Preferred shares, liquidation preference | $ |  |  |  | $ 97,036,000 |  |  | $ 97,036,000 |  |  |
Common shares outstanding (in shares) | shares |  |  |  | 15,016,000 |  | 15,020,000 |  |  |  |
Sale of common shares, net | $ |  |  | $ 31,439,000 | $ 156,038,000 | $ 58,852,000 |  |  |  |  |
Aggregate gross sales price of common share of beneficial interest allowed to be repurchased | $ |  |  |  |  |  |  |  |  |  | $ 50,000,000
Remaining available repurchase amount | $ |  |  |  |  |  |  | 21,000,000 |  |  |
Preferred shares of beneficial interest, shares outstanding (in shares) | shares |  |  |  | 3,881,000 |  | 3,881,000 |  |  |  |
Preferred units, shares issued (in shares) | shares |  |  |  | 166,000 |  | 166,000 |  |  |  |
Preferred units, liquidation preference | $ |  |  |  | $ 16,560,000 |  |  | 16,560,000 |  |  |
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 |  |  |
Aggregate gross sales price of common shares, remaining authorized amount | $ |  |  |  |  |  |  | 126,600,000 |  |  |
Incentive Plan 2015 |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Common shares forfeited (in shares) | shares |  |  | 2,000 | 500 |  |  |  |  |  |
Performance Shares | Incentive Plan 2015 |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Equity awards issued (in shares) | shares |  |  | 24,613 | 27,351 |  |  |  |  |  |
Sale of common shares, net | $ |  |  | $ 1,300,000 | $ 1,000,000 |  |  |  |  |  |
Series C Preferred Stock |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Distribution rate |  |  | 6.625% |  |  |  |  |  |  |
Preferred shares, liquidation preference | $ |  |  |  | $ 97,000,000 |  |  | 97,000,000 |  |  |
Preferred shares of beneficial interest, shares outstanding (in shares) | shares |  | 4,100,000 |  |  |  |  |  |  |  |
Liquidation preference per share (in dollars per share) | $ / shares |  | $ 25.00 |  |  |  |  |  |  |  |
Distribution accrual rate (in dollars per share) | $ / shares |  | $ 1.65625 |  |  |  |  |  |  |  |
Series D Preferred Units |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred units, shares issued (in shares) | shares |  |  |  | 165,600 |  | 165,600 |  |  |  |
Preferred units, issuance price (in dollars per share) | $ / shares |  |  | $ 100 | $ 100 |  |  |  |  |  |
Temporary equity, distribution rate |  |  | 3.862% |  |  |  |  |  |  |
Conversion ratio |  |  | 1.37931 |  |  |  |  |  |  |
Preferred units, liquidation preference | $ |  |  |  |  |  |  | 16,600,000 |  |  |
Series E Preferred Stock |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred units, shares issued (in shares) | shares | 1,800,000 |  |  |  |  |  |  |  |  |
Preferred units, par value (in dollars per share) | $ / shares | $ 100 |  |  |  |  |  |  |  |  |
Distribution rate | 3.875% |  |  |  |  |  |  |  |  |
Preferred units, conversion ratio | 1.2048 |  |  |  |  |  |  |  |  |
Preferred units, conversion exchange rate, minimum threshold (in dollars per share) | $ / shares | $ 83 |  |  |  |  |  |  |  |  |
Preferred stock, threshold trading days | 15 days |  |  |  |  |  |  |  |  |
Preferred stock, threshold consecutive trading days | 30 days |  |  |  |  |  |  |  |  |
Number of consecutive distribution periods | qtr | 3 |  |  |  |  |  |  |  |  |
Minimum distribution rate (in dollars per share) | $ / shares | $ 0.804 |  |  |  |  |  |  |  |  |
Preferred shares, liquidation preference | $ |  |  |  |  |  |  | $ 175,800,000 |  |  |
2022 Acquisitions, Three Apartment Communities |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of apartment communities acquired | apartmentCommunity |  |  | 3 |  |  |  |  |  |  |
2021 Acquisitions |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of properties | apartmentUnit | 17 |  |  |  |  |  |  |  |  |

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