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Investments In Unconsolidated Real Estate Entities (Investment In Shurgard) (Narrative) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
$ / €
shares
Dec. 31, 2019
USD ($)
€ / shares
$ / €
shares
Dec. 31, 2018
USD ($)
$ / €
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2019
€ / shares
Oct. 15, 2018
€ / shares
shares
Schedule of Equity Method Investments [Line Items]            
Gain due to Shurgard Europe public offering     $ 151,616      
Exchange rate translation | $ / € 1.122 1.122 1.144      
Shurgard [Member]            
Schedule of Equity Method Investments [Line Items]            
Shares owned | shares 31,268,459 31,268,459 31,268,459 31,268,459    
Shares issued | shares           25,000,000.0
Ownership interest, percentage 35.00% 35.00%       35.00%
Price per share | € / shares           € 23
Gain due to Shurgard Europe public offering     $ 151,600      
Increase in investment     174,000      
Reduction to other comprehensive loss, foreign currency translation     22,400      
Closing price per share | € / shares         € 34.00  
Exchange rate translation | $ / € 1.122 1.122        
Market value $ 1,200,000 $ 1,200,000        
Common stock dividends paid per share | € / shares   $ 0.67        
Cash distribution received 23,100   145,400      
Change in investment from foreign currency exchange rates (800)   (16,000) $ 19,400    
Trademark License [Member] | Shurgard [Member]            
Schedule of Equity Method Investments [Line Items]            
Cash distribution received $ 1,000   $ 1,300 $ 1,300