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Investments in Unconsolidated Real Estate Entities (Investment In Shurgard) (Narrative) (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2022
USD ($)
shares
Sep. 30, 2021
USD ($)
Sep. 30, 2022
€ / shares
Dec. 31, 2021
USD ($)
shares
Schedule of Equity Method Investments [Line Items]        
Exchange rate translation (percentage) 0.980      
Distributions from cumulative equity in earnings of unconsolidated real estate entities $ 134,460 $ 59,251    
Distributions in excess of cumulative equity in earnings from unconsolidated real estate entities $ 13,670 8,765    
Shurgard        
Schedule of Equity Method Investments [Line Items]        
Common stock owned of Shurgard (in shares) | shares 31,268,459     31,268,459
Ownership interest (percentage) 35.00%      
Closing price per share (in Euros per share) | € / shares     € 41.60  
Market value $ 1,300,000      
License fees received 2,600 2,600    
Distributions from cumulative equity in earnings of unconsolidated real estate entities 37,800 21,500    
Distributions in excess of cumulative equity in earnings from unconsolidated real estate entities 13,700 8,800    
Basis differential 65,700     $ 74,700
Amortization of basis differential $ 9,000 $ 7,300