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NONCONTROLLING INTERESTS - Interests in Consolidated Real Estate Joint Ventures (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
USD ($)
facility
Dec. 31, 2023
USD ($)
Variable Interest Entity [Line Items]    
Total assets $ 6,208,888 $ 6,225,020
Total liabilities $ 3,346,849 $ 3,344,212
VIE    
Variable Interest Entity [Line Items]    
Number of self-storage facilities owned and operated | facility 8  
Total assets $ 184,382  
Total liabilities 94,484  
Carrying amount of mortgage loans $ 89,845  
New Rochelle 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 $ 24,855  
Total liabilities 1,253  
Carrying amount of mortgage loans $ 599  
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 $ 14,141  
Total liabilities 7,931  
Carrying amount of mortgage loans $ 6,642  
350 Main Street, 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 $ 5,862  
Total liabilities $ 19  
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 $ 43,338  
Total liabilities 28,937  
Carrying amount of mortgage loans $ 27,397  
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 $ 30,200  
Total liabilities 35,325  
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 $ 19,149  
Total liabilities 14,873  
Carrying amount of mortgage loans $ 14,792  
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 $ 36,621  
Total liabilities $ 521  
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 $ 10,216  
Total liabilities 5,625  
Carrying amount of mortgage loans $ 5,540