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 number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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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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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Equity Incentive Plans (Summary Of Outstanding Options) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	112,106		112,106
Options outstanding (in shares)	118,030		118,030		234,875
Weighted avg. life remaining (in years)			4 years 6 months
Weighted avg. exercise price	$ 55.63		$ 55.63		$ 51.98
Aggregate intrinsic value	$ 2,505		$ 2,505
Share Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate			19.10%
Minimum [Member]
Share-based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit	$ 73.84	$ 61.79	$ 73.84	$ 61.79
Minimum [Member] \| Share Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate			6.70%
Maximum [Member]
Share-based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit	$ 76.63	$ 76.63	$ 76.63	$ 76.63
Forty Four Point Sixty Two To Forty Nine Point Nine Nine [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	31,445		31,445
Share-based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit			$ 44.62
Share-based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit			$ 49.99
Options outstanding (in shares)	31,445		31,445
Weighted avg. life remaining (in years)			2 years 3 months 18 days
Fifty To Fifty Nine Point Nine Nine Member
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	28,834		28,834
Share-based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit			$ 50.00
Share-based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit			$ 59.99
Options outstanding (in shares)	31,710		31,710
Weighted avg. life remaining (in years)			4 years 9 months 18 days
Sixty To Sixty Five Point Five Zero Member
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	50,719		50,719
Share-based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit			$ 60.00
Share-based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit			$ 69.99
Options outstanding (in shares)	50,719		50,719
Weighted avg. life remaining (in years)			5 years 4 months 24 days
Seventy To Seventy Six Point Six Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	1,108		1,108
Share-based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit			$ 70.00
Share-based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit			$ 76.63
Options outstanding (in shares)	4,156		4,156
Weighted avg. life remaining (in years)			8 years 3 months 18 days