EQUITY AND MEZZANINE EQUITY - Narrative (Details)		3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($) quarter $ / shares shares	Sep. 30, 2024 USD ($) quarter $ / shares shares	Sep. 30, 2023 USD ($) shares	Sep. 30, 2024 USD ($) quarter $ / shares shares	Sep. 30, 2023 USD ($) shares	Sep. 09, 2024 USD ($)	Sep. 08, 2024 USD ($)	Aug. 30, 2024 $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares	Mar. 10, 2022 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred units, shares issued (in shares) | shares	166,000	166,000		166,000					166,000
Preferred units, par value (in dollars per share) | $ / shares	$ 100	$ 100		$ 100					$ 100
Preferred units, liquidation preference	$ 16,560,000	$ 16,560,000		$ 16,560,000					$ 16,560,000
Preferred shares, liquidation preference (in dollars per share) | $ / shares									$ 25
Redemption of preferred shares		$ (3,511,000)	$ 0	$ (3,511,000)	$ 0
Preferred shares of beneficial interest, shares outstanding (in shares) | shares	0	0		0					3,881,000
Noncontrolling interests , operating partnership, outstanding (in shares) | shares	809,000	809,000		809,000					861,000
Preferred shares of beneficial interest, shares issued (in shares) | shares	0	0		0					3,881,000
Common shares of beneficial interest, shares outstanding (in shares) | shares	16,568,000	16,568,000		16,568,000					14,963,000
Sale of common shares, net		$ 104,831,000		$ 112,151,000
Share repurchase program, authorized amount										$ 50,000,000.0
Number of common shares (in shares) | shares		0	0	88,000	124,000
Remaining authorized repurchase amount	$ 4,700,000	$ 4,700,000		$ 4,700,000
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						$ 500,000,000.0	$ 250,000,000.0
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		46	64	13,511	19,014
Sale of common shares, net		$ 4,000	$ 5,000	$ 1,000,000.0	$ 1,700,000
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					165,600
Preferred units, par value (in dollars per share) | $ / shares	$ 100	$ 100		$ 100
Distribution rate				3.862%
Units converted, ratio	1.37931	1.37931		1.37931
Preferred units, liquidation preference	$ 16,600,000	$ 16,600,000		$ 16,600,000
Series C Preferred Shares Of Beneficial Interest
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares redemption intended (in shares) | shares								3,900,000
Preferred shares, liquidation preference (in dollars per share) | $ / shares	$ 25	$ 25		$ 25				$ 25
Payment for redemption of preferred stock	$ 97,000,000.0
Redemption of preferred shares	$ (3,500,000)
Preferred shares of beneficial interest, shares outstanding (in shares) | shares	0	0		0					3,900,000
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, dividend rate				3.875%
Preferred shares of beneficial interest, shares issued (in shares) | shares	1,700,000	1,700,000		1,700,000					1,700,000
Preferred units, par value (in dollars per share) | $ / shares	$ 100	$ 100		$ 100					$ 100
Preferred units, conversion ratio	1.2048	1.2048		1.2048
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	$ 169,100,000	$ 169,100,000		$ 169,100,000