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EQUITY AND MEZZANINE EQUITY - Additional Information (Details) |  |  |  | 12 Months Ended |  |
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Sep. 01, 2021 USD ($) apartmentUnit qtr $ / shares shares | Feb. 26, 2019 $ / shares shares | Oct. 02, 2017 $ / shares shares | Dec. 31, 2021 USD ($) apartment_community $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) | Dec. 05, 2019 USD ($) | Feb. 16, 2019 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Noncontrolling interests - operating partnership (in shares) |  |  |  | 832,000 | 977,000 |  |  |
Preferred units, shares issued (in shares) |  |  |  | 3,881,000 | 3,881,000 |  |  |
Number of properties | apartment_community |  |  |  | 79 |  |  |  |
Preferred shares, liquidation preference | $ |  |  |  | $ 97,036,000 | $ 97,036,000 |  |  |
Common shares outstanding (in shares) |  |  |  | 15,016,000 | 13,027,000 |  |  |
Sale of common shares, net | $ |  |  |  | $ 156,038,000 | $ 58,852,000 | $ 22,019,000 |  |
Preferred shares of beneficial interest, shares outstanding (in shares) |  |  |  | 3,881,000 | 3,881,000 |  |  |
Preferred units, shares issued (in shares) |  |  |  | 166,000 | 166,000 |  |  | 165,600
Preferred units, issuance price (in dollars per share) | $ / shares |  |  |  | $ 100 | $ 100 |  |  |
Conversion exchange rate (in dollars per share) | $ / shares |  | $ 72.50 |  |  |  |  |  |
Convertible units (in shares) |  | 1.37931 |  |  |  |  |  |
2021 Acquisitions |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of properties | apartmentUnit | 17 |  |  |  |  |  |  |
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, authorized amount | $ |  |  |  | $ 250,000,000 |  |  |  |
Aggregate gross sales price of common shares, remaining authorized amount | $ |  |  |  | $ 158,700,000 |  |  |  |
Incentive Plan 2015 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Common shares forfeited (in shares) |  |  |  | 500 | 2,400 |  |  |
Incentive Plan 2015 | Performance Shares |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Equity awards issued (in shares) |  |  |  | 27,351 | 21,000 |  |  |
Sale of common shares, net | $ |  |  |  | $ 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) |  |  | 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] |  |  |  |  |  |  |  |
Temporary equity, distribution rate |  | 3.862% |  |  |  |  |  |
Series E Preferred Stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Preferred units, shares issued (in 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 (in dollars per share) | $ / shares | $ 83 |  |  |  |  |  |  |
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 | $ | $ 181,400,000 |  |  |  |  |  |  |
Sale of common shares, net | $ |  |  |  | $ 217,513,000 |  |  |  |

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