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NONCONTROLLING INTERESTS - Interests in Consolidated Real Estate Joint Ventures (Details)
$ in Thousands
 1 Months Ended 3 Months Ended
Aug. 17, 2021
USD ($)
Apr. 16, 2021
USD ($)
Mar. 31, 2021
facility
Mar. 31, 2022
USD ($)
facility
Mar. 31, 2021
Dec. 31, 2021
USD ($)
Variable Interest Entity [Line Items]            
Total assets       $ 6,461,541   $ 6,548,079
Total liabilities       $ 3,522,095   3,549,699
Joint Venture            
Variable Interest Entity [Line Items]            
Ownership interest held by the entity (as a percent)         90.00%  
VIE            
Variable Interest Entity [Line Items]            
Number of self-storage facilities owned and operated | facility       6    
Total assets       $ 156,804    
Total liabilities       $ 62,092    
Astoria Investors, LLC            
Variable Interest Entity [Line Items]            
Ownership interest held by the entity (as a percent) 70.00%          
Contribution To Real Estate Venture $ 14,700          
Astoria Investors, LLC | Texas            
Variable Interest Entity [Line Items]            
Payments to acquire land for development $ 20,000          
Astoria Investors, LLC | VIE            
Variable Interest Entity [Line Items]            
Number of self-storage facilities owned and operated | facility       1    
Ownership interest held by the entity (as a percent)       70.00%    
Total assets       $ 21,165    
Total liabilities       6,559    
Carrying amount of mortgage loans       6,600    
Amount of mortgage loan commitment       27,100    
CS Vienna LLC            
Variable Interest Entity [Line Items]            
Amount of mortgage loan commitment       $ 17,000    
CS Vienna LLC | VIE            
Variable Interest Entity [Line Items]            
Number of self-storage facilities owned and operated | facility       1    
Ownership interest held by the entity (as a percent)       72.00%    
Total assets       $ 28,766    
Total liabilities       17,765    
Carrying amount of mortgage loans       $ 16,100    
CS 750 W Merrick Rd LLC | VIE            
Variable Interest Entity [Line Items]            
Number of self-storage facilities owned and operated | facility       1    
Ownership interest held by the entity (as a percent)       51.00%    
Total assets       $ 35,784    
Total liabilities       17,544    
Option to put ownership interest in the venture       $ 17,100    
Period of option to call ownership interest of another member       1 year    
Period of Option to Put Ownership Interest in Venture       2 years    
Option to call ownership interest of another member       $ 17,100    
Initiation period for the call option       12 months    
Accretion Liability       $ 15,900    
CS Valley Forge Village Storage LLC | VIE            
Variable Interest Entity [Line Items]            
Number of self-storage facilities owned and operated | facility       1    
Ownership interest held by the entity (as a percent)       70.00%    
Total assets       $ 20,923    
Total liabilities       14,230    
Carrying amount of mortgage loans       $ 14,200    
SH3, LLC            
Variable Interest Entity [Line Items]            
Number of self-storage facilities owned and operated | facility       1    
Ownership interest held by the entity (as a percent)       90.00%    
Total assets       $ 38,655    
Total liabilities       $ 383    
SH3, LLC | VIE            
Variable Interest Entity [Line Items]            
Number of self-storage facilities owned and operated | facility     2      
C S Lock Up Anoka LLC | VIE            
Variable Interest Entity [Line Items]            
Number of self-storage facilities owned and operated | facility       1    
Ownership interest held by the entity (as a percent)   50.00%   50.00%    
Contribution To Real Estate Venture   $ 3,400        
Total assets       $ 11,511    
Total liabilities       5,611    
Carrying amount of mortgage loans       5,500    
Amount of mortgage loan commitment       6,100    
C S Lock Up Anoka LLC | VIE | Minnesota            
Variable Interest Entity [Line Items]            
Purchase Price   $ 12,000        
Ventures            
Variable Interest Entity [Line Items]            
Total assets       $ 875,410   $ 885,010