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EQUITY AND MEZZANINE EQUITY - Narrative (Details) | 3 Months Ended | 6 Months Ended |  |
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Jun. 30, 2023 USD ($) $ / shares shares | Jun. 30, 2022 USD ($) shares | Jun. 30, 2023 USD ($) $ / shares shares | Jun. 30, 2022 USD ($) apartmentCommunity shares | Dec. 31, 2022 USD ($) $ / shares shares | Mar. 10, 2022 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Noncontrolling interests , operating partnership, outstanding (in shares) | shares | 961,000 |  | 961,000 |  | 971,000 |
Noncontrolling interests , operating partnership, issued (in shares) | shares |  |  |  | 209,000 |  |
Number of apartment communities acquired | apartmentCommunity |  |  |  | 3 |  |
Preferred shares, shares issued (in shares) | shares | 3,881,000 |  | 3,881,000 |  | 3,881,000 |
Preferred shares liquidation preference | $ 97,036,000 |  | $ 97,036,000 |  | $ 97,036,000 |
Common stock outstanding (in shares) | shares | 14,949,000 |  | 14,949,000 |  | 15,020,000 |
Sale of common shares, net |  |  |  | $ 31,569,000 |  |
Share repurchase program, authorized amount |  |  |  |  |  | $ 50,000,000
Remaining authorized repurchase amount | $ 14,200,000 |  | $ 14,200,000 |  |  |
Preferred shares of beneficial interest, shares outstanding (in shares) | shares | 3,881,000 |  | 3,881,000 |  | 3,881,000 |
Preferred shares, liquidation preference (in dollars per share) | $ / shares | $ 25 |  | $ 25 |  | $ 25 |
Preferred units, shares issued (in shares) | shares | 166,000 |  | 166,000 |  | 166,000 |
Preferred units, par value (in dollars per share) | $ / shares | $ 100 |  | $ 100 |  | $ 100 |
Preferred units, liquidation preference | $ 16,560,000 |  | $ 16,560,000 |  | $ 16,560,000 |
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 | 250,000,000 |  | 250,000,000 |  |  |
Aggregate gross sales price of common shares, remaining authorized amount | $ 126,600,000 |  | $ 126,600,000 |  |  |
2015 Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Equity awards issued (in shares) | shares | 7,073 | 5,538 | 18,950 | 24,297 |  |
Sale of common shares, net | $ 778,000 | $ 397,000 | $ 1,700,000 | $ 619,000 |  |
Series E Preferred Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Preferred shares, shares issued (in shares) | shares | 1,700,000 |  | 1,700,000 |  | 1,800,000 |
Preferred units, par value (in dollars per share) | $ / shares | $ 100 |  | $ 100 |  |  |
Preferred shares, dividend rate |  |  | 0.03875% |  |  |
Preferred units, conversion ratio | 1.2048 |  | 1.2048 |  |  |
Preferred shares liquidation preference | $ 173,800,000 |  | $ 173,800,000 |  |  |
Series C Preferred Shares |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Preferred shares, dividend rate |  |  | 6.625% |  |  |
Preferred shares liquidation preference | $ 97,000,000 |  | $ 97,000,000 |  |  |
Preferred shares of beneficial interest, shares outstanding (in shares) | shares | 3,900,000 |  | 3,900,000 |  | 3,900,000 |
Preferred shares, liquidation preference (in dollars per share) | $ / shares | $ 25.00 |  | $ 25.00 |  |  |
Preferred shares, annual 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 |  | 165,600 |
Preferred units, par value (in dollars per share) | $ / shares | $ 100 |  | $ 100 |  |  |
Distribution rate |  |  | 3.862% |  |  |
Units converted, ratio | 1.37931 |  | 1.37931 |  |  |
Preferred units, liquidation preference | $ 16,600,000 |  | $ 16,600,000 |  |  |

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- Definition The aggregate liquidation preference (or restrictions) of stock classified as temporary equity that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + References No definition available. + Details
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