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STORAGE PROPERTIES - Summary (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
STORAGE FACILITIES    
Storage properties $ 7,415,426 $ 7,367,613
Less: Accumulated depreciation (1,503,487) (1,416,377)
Storage properties, net 5,911,939 5,951,236
Land    
STORAGE FACILITIES    
Storage properties 1,616,167 1,594,742
Buildings and improvements    
STORAGE FACILITIES    
Storage properties 5,579,096 5,517,544
Equipment    
STORAGE FACILITIES    
Storage properties 143,283 144,372
Construction in progress    
STORAGE FACILITIES    
Storage properties 34,935 69,010
Right-of-use assets - finance leases    
STORAGE FACILITIES    
Storage properties $ 41,945 $ 41,945