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NONCONTROLLING INTERESTS (Details)
$ in Thousands, £ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
property
item
Jun. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
item
Dec. 31, 2013
USD ($)
Dec. 31, 2008
property
Dec. 31, 2013
GBP (£)
Dec. 31, 2013
USD ($)
Interests in Consolidated Real Estate Joint Ventures                
Gain (loss) from sale of land $ 475   $ 475          
Proceeds from sales of facilities, net     13,475          
Reduction to additional paid in capital   $ 178 $ 548          
Tilloston Ave                
Interests in Consolidated Real Estate Joint Ventures                
Option to put ownership interest in the venture   $ 17,000            
Period of option to call ownership interest of another member   1 year            
Period of option to put ownership interest in venture   1 year            
Option to call ownership interest of another member   $ 17,000            
Accretion liability   17,000            
Accrued accretion expenses   $ 7,300            
Ownership interest held by the entity (as a percent)   51.00%            
Total assets   $ 9,400            
Total liabilities   $ 8,700            
Minority ownership interest (as a percent)   49.00%            
Jamaica Ave                
Interests in Consolidated Real Estate Joint Ventures                
Accretion liability   $ 12,500            
Accrued accretion expenses   8,900            
Total liabilities   10,500            
USIFB, LLP                
Interests in Consolidated Real Estate Joint Ventures                
Ownership interest held by the entity (as a percent)           97.00%    
Number of self-storage facilities owned and operated | property           2    
Total assets   5,600            
Total liabilities   $ 300            
Carrying amount of mortgage loans             £ 4.1 $ 6,800
SRLLC                
Interests in Consolidated Real Estate Joint Ventures                
Ownership interest held by the entity (as a percent)   90.00%            
Total assets   $ 17,400            
Total liabilities   13,100            
Carrying amount of mortgage loans   12,400            
Amount of mortgage loan commitment   $ 14,600            
Payments to acquire land for development         $ 13,100      
Number of parcels in which the subdivision of land is done reporting period | item       2        
Number of parcel sold | item       1        
Proceeds from sales of facilities, net       $ 6,500        
SNL                
Interests in Consolidated Real Estate Joint Ventures                
Ownership interest held by the entity (as a percent)   90.00%            
Number of self-storage facilities owned and operated | property   2            
Total assets   $ 21,700            
Total liabilities   9,900            
Carrying amount of mortgage loans   8,100            
Amount of mortgage loan commitment   $ 22,600            
Number of entities formed | item   2            
Jamaica Ave                
Interests in Consolidated Real Estate Joint Ventures                
Period of option to call ownership interest of another member   1 year            
Option to call ownership interest of another member   $ 12,500            
Ownership interest held by the entity (as a percent)   51.00%            
Total assets   $ 22,400            
Minority ownership interest (as a percent)   49.00%            
Jamaica Ave | Jamaica Ave                
Interests in Consolidated Real Estate Joint Ventures                
Option to put ownership interest in the venture   $ 12,500            
Period of option to put ownership interest in venture   1 year