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STORAGE PROPERTIES - Summary (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
STORAGE FACILITIES    
Storage properties $ 7,323,638 $ 7,295,778
Less: Accumulated depreciation (1,333,907) (1,247,775)
Storage properties, net (including VIE assets of $142,326 and $167,180, respectively) 5,989,731 6,048,003
Land    
STORAGE FACILITIES    
Storage properties 1,588,138 1,588,138
Buildings and improvements    
STORAGE FACILITIES    
Storage properties 5,493,954 5,483,506
Equipment    
STORAGE FACILITIES    
Storage properties 146,904 144,605
Construction in progress    
STORAGE FACILITIES    
Storage properties 52,697 37,584
Right-of-use assets - finance leases    
STORAGE FACILITIES    
Storage properties $ 41,945 $ 41,945