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NONCONTROLLING INTERESTS - Interests in Consolidated Real Estate Joint Ventures (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
USD ($)
facility
Dec. 31, 2022
USD ($)
Variable Interest Entity [Line Items]    
Total assets $ 6,291,005 $ 6,325,830
Total liabilities $ 3,403,844 $ 3,428,030
VIE    
Variable Interest Entity [Line Items]    
Number of self-storage facilities owned and operated | facility 6  
Total assets $ 132,943  
Total liabilities 70,232  
Carrying amount of mortgage loans $ 66,972  
1074 Raritan Road, 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) 90.00%  
Total assets $ 4,392  
Total liabilities $ 898  
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 $ 27,556  
Total liabilities 12,955  
Carrying amount of mortgage loans $ 11,539  
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) 80.00%  
Total assets $ 32,026  
Total liabilities 35,195  
Carrying amount of mortgage loans $ 34,875  
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 $ 20,461  
Total liabilities 15,087  
Carrying amount of mortgage loans $ 15,018  
SH3, 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) 90.00%  
Total assets $ 37,723  
Total liabilities $ 492  
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%  
Total assets $ 10,785  
Total liabilities 5,605  
Carrying amount of mortgage loans $ 5,540