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STORAGE PROPERTIES - Summary (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
STORAGE FACILITIES    
Storage properties $ 7,232,103 $ 7,183,494
Less: Accumulated depreciation (1,130,001) (1,085,824)
Storage properties, net (including VIE assets of $156,775 and $149,467, respectively) 6,102,102 6,097,670
Land    
STORAGE FACILITIES    
Storage properties 1,575,446 1,565,463
Buildings and improvements    
STORAGE FACILITIES    
Storage properties 5,396,489 5,368,383
Equipment    
STORAGE FACILITIES    
Storage properties 132,189 129,531
Construction in progress    
STORAGE FACILITIES    
Storage properties 86,034 78,221
Right-of-use assets - finance leases    
STORAGE FACILITIES    
Storage properties $ 41,945 $ 41,896