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STORAGE PROPERTIES - Summary (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
STORAGE FACILITIES    
Storage properties $ 7,268,162 $ 7,183,494
Less: Accumulated depreciation (1,174,746) (1,085,824)
Storage properties, net (including VIE assets of $162,334 and $149,467, respectively) 6,093,416 6,097,670
Land    
STORAGE FACILITIES    
Storage properties 1,581,630 1,565,463
Buildings and improvements    
STORAGE FACILITIES    
Storage properties 5,435,413 5,368,383
Equipment    
STORAGE FACILITIES    
Storage properties 137,380 129,531
Construction in progress    
STORAGE FACILITIES    
Storage properties 71,794 78,221
Right-of-use assets - finance leases    
STORAGE FACILITIES    
Storage properties $ 41,945 $ 41,896