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STORAGE PROPERTIES - Summary (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
STORAGE FACILITIES    
Storage properties $ 4,716,549 $ 4,699,844
Less: Accumulated depreciation (944,958) (925,359)
Storage properties, net (including VIE assets of $100,143 and $92,612, respectively) 3,771,591 3,774,485
Land    
STORAGE FACILITIES    
Storage properties 859,607 858,541
Buildings and improvements    
STORAGE FACILITIES    
Storage properties 3,627,204 3,619,594
Equipment    
STORAGE FACILITIES    
Storage properties 124,667 128,111
Construction in progress    
STORAGE FACILITIES    
Storage properties $ 105,071 $ 93,598