EQUITY AND MEZZANINE EQUITY - Additional Information (Details)				12 Months Ended
	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