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STORAGE FACILITIES (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
STORAGE FACILITIES    
Storage facilities $ 2,436,455 $ 2,443,022
Less: Accumulated depreciation (367,336) (353,315)
Storage facilities, net 2,069,119 2,089,707
Land
   
STORAGE FACILITIES    
Storage facilities 458,446 462,626
Buildings and improvements
   
STORAGE FACILITIES    
Storage facilities 1,826,117 1,828,388
Equipment
   
STORAGE FACILITIES    
Storage facilities 142,506 143,836
Construction in progress
   
STORAGE FACILITIES    
Storage facilities $ 9,386 $ 8,172