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Equity Incentive Plans (Summary Of Share Option Activity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
May 12, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 3 years 9 months 18 days      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 3 years 1 month 6 days      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 95,565      
Maximum term of options granted (in years) 10 years      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Number of Shares, Outstanding at Beginning of Period 108,671      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 9,799      
Number of Shares, Outstanding at End of Period 98,872      
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price $ 46.30      
Average Exercise Price, Outstanding at Beginning of Period 57.83   $ 56.79  
Average Exercise Price, Outstanding at End of Period $ 57.83   56.79  
Weighted average fair value of options granted   $ 20.34    
Intrinsic value of stock options exercised $ 38      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price $ 57.77      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value $ 162      
Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Price Per Share $ 44.62      
Option Price Per Share, Outstanding at Beginning of Period 44.44   44.44  
Option Price Per Share, Outstanding at End of Period 44.44   44.44  
Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Price Per Share 47.15      
Option Price Per Share, Outstanding at Beginning of Period 76.63   76.63  
Option Price Per Share, Outstanding at End of Period $ 76.63   $ 76.63  
2016 Equity Incentive Plan [Member]        
Common shares, options to purchase common shares and restricted share units, expected to granted (in shares)       3,950,000
Number of shares available for grant (in shares) 2,022,200      
Forty Four Point Forty Four To Forty Nine Point Nine Nine [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 5 years 1 month 6 days      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 2 years      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 10,132      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Number of Shares, Outstanding at End of Period 11,510      
Forty Four Point Forty Four To Forty Nine Point Nine Nine [Member] | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Option Price Per Share, Outstanding at Beginning of Period $ 44.44      
Option Price Per Share, Outstanding at End of Period 44.44      
Forty Four Point Forty Four To Forty Nine Point Nine Nine [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Option Price Per Share, Outstanding at Beginning of Period 49.99      
Option Price Per Share, Outstanding at End of Period $ 49.99      
Fifty To Fifty Nine Point Nine Nine Member        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 2 years 3 months 18 days      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 2 years 3 months 18 days      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 31,008      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Number of Shares, Outstanding at End of Period 31,008      
Fifty To Fifty Nine Point Nine Nine Member | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Option Price Per Share, Outstanding at Beginning of Period $ 50.00      
Option Price Per Share, Outstanding at End of Period 50.00      
Fifty To Fifty Nine Point Nine Nine Member | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Option Price Per Share, Outstanding at Beginning of Period 59.99      
Option Price Per Share, Outstanding at End of Period $ 59.99      
Sixty To Sixty Five Point Five Zero Member        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 4 years 3 months 18 days      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 3 years 7 months 6 days      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 50,754      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Number of Shares, Outstanding at End of Period 52,198      
Sixty To Sixty Five Point Five Zero Member | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Option Price Per Share, Outstanding at Beginning of Period $ 60.00      
Option Price Per Share, Outstanding at End of Period 60.00      
Sixty To Sixty Five Point Five Zero Member | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Option Price Per Share, Outstanding at Beginning of Period 69.99      
Option Price Per Share, Outstanding at End of Period $ 69.99      
Seventy To Seventy Six Point Six Three [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 5 years 9 months 18 days      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 5 years 8 months 12 days      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 3,671      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Number of Shares, Outstanding at End of Period 4,156      
Seventy To Seventy Six Point Six Three [Member] | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Option Price Per Share, Outstanding at Beginning of Period $ 70.00      
Option Price Per Share, Outstanding at End of Period 70.00      
Seventy To Seventy Six Point Six Three [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Option Price Per Share, Outstanding at Beginning of Period 76.63      
Option Price Per Share, Outstanding at End of Period $ 76.63