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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2024
USD ($)
property
partnership
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
Jan. 03, 2023
USD ($)
Jan. 02, 2023
USD ($)
Variable Interest Entity [Line Items]          
Constructive receipts under debt financings $ 240,000 $ 325,815      
Constructive payments under debt financings $ 613,401 $ 232,459      
Number of self storage properties | property 1,050        
Net book value of real estate owned $ 4,877,930   $ 4,917,815    
Carrying value of fixed rate mortgages $ 3,295,228   3,668,757    
VIE, Primary Beneficiary          
Variable Interest Entity [Line Items]          
Number of partnerships considered to be VIEs | partnership 22        
Number of self storage properties | property 49        
Net book value of real estate owned $ 415,900   418,900    
Revision of Prior Period, Adjustment          
Variable Interest Entity [Line Items]          
Constructive receipts under debt financings 129,800        
Constructive payments under debt financings 129,800        
Mortgages | Fixed Rate Mortgages payable          
Variable Interest Entity [Line Items]          
Carrying value of fixed rate mortgages 222,228   222,757    
Mortgages | Fixed Rate Mortgages payable | VIE, Primary Beneficiary          
Variable Interest Entity [Line Items]          
Carrying value of fixed rate mortgages 188,700   $ 188,700    
Line of Credit | Credit Facility          
Variable Interest Entity [Line Items]          
Maximum borrowing capacity $ 1,825,000     $ 1,955,000 $ 405,000