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Real Estate Facilities (Narrative) (Details)
ft² in Thousands, $ in Thousands
 12 Months Ended
Jul. 08, 2022
USD ($)
site
property
Dec. 31, 2022
USD ($)
ft²
storage_facility
Dec. 31, 2021
USD ($)
ft²
storage_facility
Dec. 31, 2020
USD ($)
ft²
storage_facility
Schedule Of Real Estate Facilities [Line Items]        
Payments to acquire real estate   $ 757,944 $ 5,047,106 $ 792,266
Write off development cost   7,000    
Land cost transferred   2,200    
Proceeds from real estate and real estate joint ventures   1,543 16,296 1,796
Gain on sale of real estate   1,503 13,683 1,493
Write-off of cancelled projects   9,188 $ 0 $ 3,226
Adjusted basis of real estate   $ 16,500,000    
Acquisition of Self-Storage Facilities Other Investments        
Schedule Of Real Estate Facilities [Line Items]        
Number of operating self-storage facilities | storage_facility   74 232 62
Net rentable area acquired | ft²   4,700 21,830 5,100
Total cost of acquisition   $ 730,500 $ 5,100,000 $ 792,300
Payments to acquire real estate   710,600 5,000,000  
Issuance of partnership units   19,900 68,200  
Payments to acquire intangible assets   24,100 174,900 14,900
Liabilities assumed       3,800
Commercial Interests        
Schedule Of Real Estate Facilities [Line Items]        
Total cost of acquisition $ 47,300      
Number of properties acquired | property 5      
Number of sites in commercial interest acquisition | site 3      
Real estate investments, net $ 27,000      
Intangible assets, gross (excluding goodwill) 700      
Increase of equity investment $ 19,600      
Disposal of Real Estate Facilities        
Schedule Of Real Estate Facilities [Line Items]        
Gain on sale of real estate   1,500 13,700  
Completed Developed and Expansion Project | Newly Developed and Expansion Projects        
Schedule Of Real Estate Facilities [Line Items]        
Aggregate costs to develop and expand   $ 227,200 $ 218,000 $ 138,700
Additional net rentable square feet | ft²   1,400 1,600 1,100