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STORAGE PROPERTIES - Summary (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
STORAGE FACILITIES      
Storage properties $ 7,295,778 $ 7,183,494  
Less: Accumulated depreciation (1,247,775) (1,085,824)  
Storage properties, net (including VIE assets of $167,180 and $149,467, respectively) 6,048,003 6,097,670 $ 4,505,814
Land      
STORAGE FACILITIES      
Storage properties 1,588,138 1,565,463  
Buildings and improvements      
STORAGE FACILITIES      
Storage properties 5,483,506 5,368,383  
Equipment      
STORAGE FACILITIES      
Storage properties 144,605 129,531  
Construction in progress      
STORAGE FACILITIES      
Storage properties 37,584 78,221  
Right-of-use assets - finance leases      
STORAGE FACILITIES      
Storage properties $ 41,945 $ 41,896