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Investments in Unconsolidated Real Estate Entities (Investment In Shurgard) (Narrative) (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
USD ($)
shares
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
shares
Sep. 30, 2022
USD ($)
Sep. 30, 2023
€ / shares
Dec. 31, 2022
USD ($)
shares
Schedule of Equity Method Investments [Line Items]            
Exchange rate translation (as percent) 1.057   1.057      
Cash distribution received     $ 17,663 $ 134,460    
Distributions in excess of cumulative equity in earnings from unconsolidated real estate entities     3,165 13,670    
Foreign currency translation loss on investment in Shurgard $ (5,958) $ (17,253) (787) (42,883)    
Shurgard            
Schedule of Equity Method Investments [Line Items]            
Investments in shurgard $ 278,100   $ 278,100     $ 275,800
Common stock owned of Shurgard (in shares) | shares 31,268,459   31,268,459     31,268,459
Ownership interest (percentage) 35.00%   35.00%      
Share price | € / shares         € 37.50  
Market value $ 1,200,000   $ 1,200,000      
License fees received     2,800 2,600    
Cash distribution received     19,800 37,800    
Distributions in excess of cumulative equity in earnings from unconsolidated real estate entities     3,200 13,700    
Basis differential $ 63,200   63,200     $ 67,800
Amortization of basis differential     4,600 9,000    
Shurgard | Trademark License            
Schedule of Equity Method Investments [Line Items]            
Cash distribution received     $ 1,000 $ 900