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Equity Incentive Plans (Summary Of Share Option Activity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
May 12, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Non-employee Trustee Length of Period Subsequent to Grant Date Options Not Exercisable 1 year      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 5 years 8 months      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 5 years 2 months      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 189,039      
Maximum term of options granted (in years) 10 years      
Exercisable rate for employees options, per year 25.00%      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Number of Shares, Outstanding at Beginning of Period 285,986      
Number of Shares, Exercised (28,281)      
Number of Shares, Granted 2,215      
Number of Shares, Outstanding at End of Period 258,578      
Average Exercise Price, Outstanding at Beginning of Period $ 51.80   $ 51.93  
Average Exercise Price, Exercised 54.72      
Average Exercise Price, Outstanding at End of Period 51.80   51.93  
Weighted average fair value of options granted $ 7.91      
Intrinsic value of stock options exercised $ 500 $ 3,400    
Repurchase of treasury stock (in shares) 21,260      
Repurchase of treasury stock, value $ 1,500      
Share based compensation expenses recognized in future periods $ 500      
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price $ 76.63      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period (1,342)      
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price $ 59.52      
Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Option Price Per Share, Outstanding at Beginning of Period 19.02   19.02  
Option Price Per Share, Exercised 46.86      
Option Price Per Share, Outstanding at End of Period 19.02   19.02  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Price Per Share 76.63      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period, Price Per Share 51.64      
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   61.79  
Option Price Per Share, Exercised 61.79      
Option Price Per Share, Outstanding at End of Period 76.63   $ 61.79  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Price Per Share 76.63      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period, Price Per Share $ 61.79      
Share Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Stock-option expense $ 528 $ 684    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum 2.10%      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate 22.00%      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Forfeiture Rate 0.74%      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 6 years 6 years    
Share Options [Member] | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate 5.40%      
2016 Equity Incentive Plan [Member]        
Common shares, options to purchase common shares and restricted share units, expected to granted (in shares)       1,950,000
Number of shares available for grant (in shares) 1,633,001      
Exercise Price Range Nineteen Point Two to Nineteen Point Nine Nine [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 1 year 7 months      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 1 year 7 months      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 11,097      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Number of Shares, Outstanding at End of Period 11,097      
Thirty To Thirty 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      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 2 years 3 months      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 1,428      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Number of Shares, Outstanding at End of Period 1,428      
Forty To Forty Nine Point Nine Nine Member        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 4 years 3 months      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 4 years 3 months      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 86,863      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Number of Shares, Outstanding at End of Period 86,863      
Fifty To Fifty Nine Point Nine Nine Member        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 6 years 1 month      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 6 years      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 51,276      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Number of Shares, Outstanding at End of Period 75,939      
Sixty To Sixty Five Point Five Zero Member        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 7 years 5 months      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 7 years 5 months      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 38,375      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Number of Shares, Outstanding at End of Period 81,036      
Seventy To Seventy Six Point Six Three [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 9 years 5 months      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Number of Shares, Outstanding at End of Period 2,215