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Equity Incentive Plans (Summary Of Share Option Activity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
May 12, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 7,986      
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price $ 53.98      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 4 years 9 months      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 4 years 7 months      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 226,576      
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 257,606      
Number of Shares, Granted 3,835      
Number of Shares, Outstanding at End of Period 252,610      
Average Exercise Price, Outstanding at Beginning of Period $ 51.79   $ 51.81  
Average Exercise Price, Outstanding at End of Period 51.79   51.81  
Weighted average fair value of options granted $ 3.03 $ 7.91    
Intrinsic value of stock options exercised $ 100 $ 500    
Share based compensation expenses recognized in future periods $ 100      
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price $ 56.94      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period 845      
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price $ 61.12      
Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period, Price Per Share 51.64      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Price Per Share 45.20      
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, 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 56.94      
Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period, Price Per Share 61.79      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Price Per Share 61.79      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
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  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Price Per Share $ 56.94      
Share Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Stock-option expense $ 213 $ 528    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum 2.70%      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate 18.90%      
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      
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 7.60%      
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) 1,322,389      
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 7 months      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 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 1 year 3 months      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 1 year 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 3 years 3 months      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 3 years 3 months      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 84,509      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Number of Shares, Outstanding at End of Period 84,509      
Fifty To Fifty Nine Point Nine Nine Member        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 5 years 6 months      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 5 years 3 months      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 71,798      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Number of Shares, Outstanding at End of Period 75,633      
Sixty To Sixty Five Point Five Zero Member        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 6 years 5 months      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 6 years 5 months      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 57,190      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Number of Shares, Outstanding at End of Period 77,728      
Seventy To Seventy Six Point Six Three [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 8 years 5 months      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 8 years 5 months      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 554      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Number of Shares, Outstanding at End of Period 2,215