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STORAGE PROPERTIES - Summary (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
STORAGE FACILITIES    
Storage facilities $ 4,020,366 $ 3,998,180
Less: Accumulated depreciation (693,146) (671,364)
Storage facilities, net (including VIE assets of $229,699 and $208,048, respectively) 3,327,220 3,326,816
Land    
STORAGE FACILITIES    
Storage facilities 651,119 649,744
Buildings and improvements    
STORAGE FACILITIES    
Storage facilities 2,938,899 2,928,275
Equipment    
STORAGE FACILITIES    
Storage facilities 208,373 217,867
Construction in progress    
STORAGE FACILITIES    
Storage facilities $ 221,975 $ 202,294