SELF STORAGE PROPERTY ACQUISITIONS AND DISPOSITIONS - Acquisitions (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2024 USD ($) property	Sep. 30, 2024 USD ($) property	Jun. 30, 2024 USD ($) property	Mar. 31, 2024 USD ($) property	Dec. 31, 2023 USD ($) property	Sep. 30, 2023 USD ($) property	Jun. 30, 2023 USD ($) property	Mar. 31, 2023 USD ($) property	Dec. 31, 2024 USD ($) property	Dec. 31, 2023 USD ($) property
Asset Acquisitions During Period
Number of Properties | property	4	0	3	0	2	2	0	16	7	20
Cash and Acquisition Costs	$ 39,514	$ 0	$ 25,063	$ 0	$ 16,972	$ 13,666	$ 8,167	$ 9,920	$ 64,577	$ 48,725
Value of Equity	0	0	0	0	8,062	16,370	5,577	150,531	0	180,540
Other Liabilities/ (Other Assets)	122	0	174	0	(12)	78	34	85	296	185
Total	$ 39,636	$ 0	$ 25,237	$ 0	$ 25,022	$ 30,114	$ 13,778	$ 160,536	$ 64,873	$ 229,450