Equity Incentive Plans (Summary Of Share Option Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	May 12, 2016
Maximum term of options granted, years	10 years
Exercisable rate for employees options, per year	25.00%
Share based compensation, future vesting period minimum (in years)	4 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of Shares, Outstanding at Beginning of Period	257,606	285,986	516,305
Number of Shares, Exercised	(25,721)	(29,253)	(230,319)
Number of Shares, Granted	3,835	2,215
Number of Shares, Forfeited	(845)	(1,342)
Number of Shares, Outstanding at End of Period	234,875	257,606	285,986
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	$ 51.81	$ 51.93	$ 48.42
Average Exercise Price, Exercised	50.68	54.54	44.05
Average Exercise Price, Granted	56.94	76.63
Average Exercise Price, Forfeited	61.12	59.52
Average Exercise Price, Outstanding at End of Period	51.98	51.81	51.93
Weighted average fair value of options granted	$ 3.03	$ 7.91	$ 0
Intrinsic value of stock options exercised	$ 400	$ 500	$ 5,200
Severance expense	$ 5,938	$ 0	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Repurchase of Treasury Shares	20,258
Share-based Compensation Arrangement by Share-based Payment Award, Repurchase of Treasury Value	$ 1,400
Minimum [Member]
Share based compensation, future vesting period minimum (in years)	3 years
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	$ 19.02	$ 19.02	$ 19.02
Option Price Per Share, Exercised	45.20	46.86	19.41
Option Price Per Share, Granted	56.94	76.63
Option Price Per Share, Forfeited	51.64	51.64
Option Price Per Share, Outstanding at End of Period	$ 19.02	19.02	19.02
Maximum [Member]
Share based compensation, future vesting period minimum (in years)	4 years
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	61.79	65.50
Option Price Per Share, Exercised	61.79	61.79	65.50
Option Price Per Share, Granted	56.94	76.63
Option Price Per Share, Forfeited	61.79	61.79
Option Price Per Share, Outstanding at End of Period	$ 76.63	$ 76.63	$ 61.79
2016 Equity Incentive Plan [Member]
Common shares, options to purchase common shares and restricted share units, expected to granted				1,950,000
Number of shares available for grant	1,322,389
Stock Options [Member]
Share based compensation, future vesting period minimum (in years)	4 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Stock or Unit Option Plan Expense	$ 300	$ 700	$ 900
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum	2.70%	2.10%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	7.60%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum		22.00%
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%	0.74%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	6 years	6 years
Stock Options [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate		5.40%

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Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The minimum risk-free interest rate assumption that is used in valuing an option on its own shares.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Net number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation.

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