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STORAGE PROPERTIES - Summary (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
STORAGE FACILITIES    
Storage properties $ 7,303,888 $ 7,295,778
Less: Accumulated depreciation (1,290,075) (1,247,775)
Storage properties, net (including VIE assets of $131,605 and $167,180, respectively) 6,013,813 6,048,003
Land    
STORAGE FACILITIES    
Storage properties 1,588,138 1,588,138
Buildings and improvements    
STORAGE FACILITIES    
Storage properties 5,485,336 5,483,506
Equipment    
STORAGE FACILITIES    
Storage properties 146,052 144,605
Construction in progress    
STORAGE FACILITIES    
Storage properties 42,417 37,584
Right-of-use assets - finance leases    
STORAGE FACILITIES    
Storage properties $ 41,945 $ 41,945