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Related Party Transactions (Narrative) (Details)
$ in Thousands
9 Months Ended
Jul. 08, 2022
USD ($)
site
property
Sep. 30, 2022
USD ($)
adult_children
storage_facility
Sep. 30, 2021
USD ($)
Related Party Transaction [Line Items]      
Tenants reinsurance premiums earned by subsidiaries   $ 1,700 $ 1,500
Proceeds from sale of equity investment in PS Business Parks, Inc.   $ 2,636,011 $ 0
Commercial Interests      
Related Party Transaction [Line Items]      
Number of sites in commercial interest acquisition | site 3    
Total cost of acquisition $ 47,300    
Real estate investments, net 27,000    
Intangible assets, gross (excluding goodwill) $ 700    
Number of properties acquired | property 5    
Canada | Hughes Owned Canadian Facilities      
Related Party Transaction [Line Items]      
Number of self-storage facilities | storage_facility   65  
Number of ms. gustavson's adult children owning remaining equity in LLC | adult_children   2  
Ownership interest by parent   0.00%  
Canada | Hughes Owned Canadian Facilities | Tamara Hughes Gustavson      
Related Party Transaction [Line Items]      
Ownership interest of noncontrolling owners (less than)   0.10%