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STORAGE PROPERTIES - Summary (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
STORAGE FACILITIES    
Storage facilities $ 4,161,715 $ 3,998,180
Less: Accumulated depreciation (752,925) (671,364)
Storage facilities, net (including VIE assets of $291,496 and $208,048, respectively) 3,408,790 3,326,816
Land    
STORAGE FACILITIES    
Storage facilities 711,140 649,744
Buildings and improvements    
STORAGE FACILITIES    
Storage facilities 3,086,252 2,928,275
Equipment    
STORAGE FACILITIES    
Storage facilities 182,958 217,867
Construction in progress    
STORAGE FACILITIES    
Storage facilities $ 181,365 $ 202,294