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Equity Incentive Plans (Summary Of Share Option Activity) (Details) - USD ($)
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
May 12, 2016
Maximum term of options granted, years 10 years      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Number of Shares, Outstanding at Beginning of Period 81,191 96,112 108,671  
Number of Shares, Exercised     (12,559)  
Number of Shares, Granted 0 0 0  
Number of Shares, Forfeited (23,752) (14,921)    
Number of Shares, Outstanding at End of Period 57,439 81,191 96,112  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]        
Average Exercise Price, Outstanding at Beginning of Period $ 59.16 $ 58.15 $ 56.79  
Average Exercise Price, Exercised     46.43  
Average Exercise Price, Forfeited 51.64 52.68    
Average Exercise Price, Outstanding at End of Period $ 62.26 $ 59.16 $ 58.15  
Intrinsic value of stock options exercised $ 0 $ 0 $ 62,000  
Stock or Unit Option Plan Expense 9,000 12,000 14,000  
Non-Employee Trustees [Member] | Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]        
Share-based Payment Arrangement, Expense $ 1,800,000 $ 1,900,000 $ 2,200,000  
Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Option Price Per Share [Roll Forward]        
Option Price Per Share, Outstanding at Beginning of Period $ 44.44 $ 44.44 $ 44.44  
Option Price Per Share, Exercised     44.62  
Option Price Per Share, Forfeited 51.64 46.86    
Option Price Per Share, Outstanding at End of Period 44.44 44.44 44.44  
Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Option Price Per Share [Roll Forward]        
Option Price Per Share, Outstanding at Beginning of Period 76.63 76.63 76.63  
Option Price Per Share, Exercised     47.15  
Option Price Per Share, Forfeited 51.64 61.79    
Option Price Per Share, Outstanding at End of Period $ 76.63 $ 76.63 $ 76.63  
2016 Equity Incentive Plan [Member]        
Common shares, options to purchase common shares and restricted share units, expected to granted       3,950,000
Number of shares available for grant 904,048