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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Restricted Cash, Loan Costs and Other Assets (Details)
$ in Thousands
 12 Months Ended
Sep. 05, 2018
USD ($)
facility
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Long-Lived Assets held for sale, timing of expected sale   1 year  
Loan procurement costs      
Loan procurement costs   $ 50,100 $ 38,100
Loan procurement costs, accumulated amortization   14,300 13,100
Other Assets      
Intangible assets, net of accumulated amortization of $12,760 and $2,123   108,794 57,820
Accounts receivable, net   8,145 5,829
Prepaid property taxes   6,938 6,334
Prepaid property and casualty insurance   3,352 2,626
Amounts due from affiliates (see note 14)   15,417 13,130
Assets related to deferred compensation arrangements   60,297 17,207
Right-of-use assets - operating leases (see note 13)   $ 54,741 $ 55,302
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]   Total Total
Equity investment recorded at cost     $ 5,000
Other   $ 8,021 7,505
Total   265,705 170,753
Accumulated amortization   $ 12,760 $ 2,123
Capital Storage Partners, LLC      
Other Assets      
Equity investment recorded at cost $ 5,000    
Preferred units ownership (as a percent) 100.00%    
Number of self-storage facilities acquired | facility 22    
Series A Preferred shares, percentage 11.00%    
Capital Storage Partners, LLC | Florida      
Other Assets      
Number of self-storage facilities acquired | facility 4    
Capital Storage Partners, LLC | Oklahoma      
Other Assets      
Number of self-storage facilities acquired | facility 5    
Capital Storage Partners, LLC | Texas      
Other Assets      
Number of self-storage facilities acquired | facility 13