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STORAGE PROPERTIES - Summary (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
STORAGE FACILITIES    
Storage properties $ 5,536,376 $ 5,489,754
Less: Accumulated depreciation (1,026,337) (983,940)
Storage properties, net (including VIE assets of $132,927 and $119,345, respectively) 4,510,039 4,505,814
Land    
STORAGE FACILITIES    
Storage properties 1,113,737 1,093,503
Buildings and improvements    
STORAGE FACILITIES    
Storage properties 4,197,607 4,122,995
Equipment    
STORAGE FACILITIES    
Storage properties 123,199 123,044
Construction in progress    
STORAGE FACILITIES    
Storage properties 60,419 108,316
Right-of-use assets - finance leases    
STORAGE FACILITIES    
Storage properties $ 41,414 $ 41,896