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Investments in Unconsolidated Real Estate Entities (Investment In Shurgard) (Narrative) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
USD ($)
shares
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2022
€ / shares
Schedule of Equity Method Investments [Line Items]        
Exchange rate translation (percentage) 1.070 1.134    
Distributions from cumulative equity in earnings of unconsolidated real estate entities $ 134,769 $ 150,488 $ 72,098  
Distributions in excess of cumulative equity in earnings from unconsolidated real estate entities $ 13,670 $ 19,518 $ 24,658  
Shurgard        
Schedule of Equity Method Investments [Line Items]        
Common stock owned of Shurgard (in shares) | shares 31,268,459 31,268,459 31,268,459  
Ownership interest (percentage) 35.00% 35.00% 35.00%  
Closing price per share (in Euros per share) | € / shares       € 42.85
Market value $ 1,400,000      
License fees received 3,500 $ 3,500 $ 3,100  
Distributions from cumulative equity in earnings of unconsolidated real estate entities 37,800 41,500 34,900  
Distributions in excess of cumulative equity in earnings from unconsolidated real estate entities 13,700 19,500 24,700  
Basis differential 67,800 74,700    
Amortization of basis differential $ 6,900 $ 8,400 $ 5,800