SELF STORAGE PROPERTIES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Real Estate [Abstract]
Land	$ 1,111,326	$ 1,028,431
Buildings and improvements	5,269,383	4,760,567
Furniture and equipment	10,863	9,190
Total self storage properties	6,391,572	5,798,188
Less accumulated depreciation	(772,661)	(578,717)
Self storage properties, net	5,618,911	5,219,471
Depreciation expense related to self storage properties	$ 195,900	$ 135,100	$ 105,900