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.

+ References

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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
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	112,695
Options outstanding (in shares)	119,510		118,030
Weighted avg. life remaining (in years)	4 years 8 months 12 days
Weighted avg. exercise price	$ 56.09		$ 55.63
Aggregate intrinsic value	$ 0
Minimum [Member]
Share-based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit	$ 56.94	$ 73.84
Maximum [Member]
Share-based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit	$ 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	30,035
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)	30,035
Weighted avg. life remaining (in years)	1 year 10 months 24 days
Fifty To Fifty Nine Point Nine Nine Member
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	29,793
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
Weighted avg. life remaining (in years)	4 years 3 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
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)	53,609
Weighted avg. life remaining (in years)	6 years 2 months 12 days
Seventy To Seventy Six Point Six Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	2,148
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
Weighted avg. life remaining (in years)	7 years 9 months 18 days