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STORAGE PROPERTIES - Summary (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
STORAGE FACILITIES      
Storage properties $ 7,367,613 $ 7,295,778  
Less: Accumulated depreciation (1,416,377) (1,247,775)  
Storage properties, net 5,951,236 6,048,003 $ 6,097,670
Land      
STORAGE FACILITIES      
Storage properties 1,594,742 1,588,138  
Buildings and improvements      
STORAGE FACILITIES      
Storage properties 5,517,544 5,483,506  
Equipment      
STORAGE FACILITIES      
Storage properties 144,372 144,605  
Construction in progress      
STORAGE FACILITIES      
Storage properties 69,010 37,584  
Right-of-use assets - finance leases      
STORAGE FACILITIES      
Storage properties $ 41,945 $ 41,945