Equity Incentive Plans (Summary Of Share Option Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	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	234,875	257,606	285,986
Number of Shares, Exercised	(118,786)	(25,721)	(29,253)
Number of Shares, Granted	1,941	3,835	2,215
Number of Shares, Forfeited		(845)	(1,342)
Number of Shares, Outstanding at End of Period	118,030	234,875	257,606
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	$ 51.98	$ 51.81	$ 51.93
Average Exercise Price, Exercised	48.71	50.68	54.54
Average Exercise Price, Granted	73.84	56.94	76.63
Average Exercise Price, Forfeited		61.12	59.52
Average Exercise Price, Outstanding at End of Period	55.63	51.98	51.81
Weighted average fair value of options granted	$ 4.64	$ 3.03	$ 7.91
Intrinsic value of stock options exercised	$ 2,800	$ 400	$ 500
Share-based Compensation Arrangement by Share-based Payment Award, Repurchase of Treasury Shares	90,873
Share-based Compensation Arrangement by Share-based Payment Award, Repurchase of Treasury Value	$ 6,500
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	$ 19.02	$ 19.02	$ 19.02
Option Price Per Share, Exercised	19.02	45.20	46.86
Option Price Per Share, Granted	73.84	56.94	76.63
Option Price Per Share, Forfeited		51.64	51.64
Option Price Per Share, Outstanding at End of Period	44.62	19.02	19.02
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	61.79
Option Price Per Share, Exercised	61.79	61.79	61.79
Option Price Per Share, Granted	73.84	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	$ 76.63
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	1,091,880
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Stock or Unit Option Plan Expense	$ 10	$ 300	$ 700
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum	2.40%	2.70%	2.10%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	6.70%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	19.10%	18.90%	22.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Forfeiture Rate	0.75%	0.74%	0.74%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	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		7.60%	5.40%

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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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Number of shares authorized for issuance under share-based payment arrangement.

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

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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 award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of noncash expense for option under share-based payment arrangement.

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