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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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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- Definition

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

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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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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-Name Accounting Standards Codification
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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.

+ References

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-SubTopic 10
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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, 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 Exercisable Options) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	118,030	234,875	257,606	285,986
Exercise price range, lower limit	$ 73.84	$ 61.79	$ 61.79
Exercise price range, upper limit	$ 76.63	$ 76.63	$ 76.63
Options outstanding	112,106
Weighted avg. life remaining	4 years
Weighted avg. exercise price	$ 55.08
Aggregate intrinsic value	$ 1,751
44.62-49.99 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	31,445
Exercise price range, lower limit	$ 44.62
Exercise price range, upper limit	$ 49.99
Options outstanding	31,445
Weighted avg. life remaining	2 years 1 month 6 days
50.00 - 59.99 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	31,710
Exercise price range, lower limit	$ 50.00
Exercise price range, upper limit	$ 59.99
Options outstanding	28,834
Weighted avg. life remaining	4 years 1 month 6 days
60.00 - 69.99 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	50,719
Exercise price range, lower limit	$ 60.00
Exercise price range, upper limit	$ 69.99
Options outstanding	50,719
Weighted avg. life remaining	5 years 1 month 6 days
70.00 - 76.63 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	4,156
Exercise price range, lower limit	$ 70.00
Exercise price range, upper limit	$ 76.63
Options outstanding	1,108
Weighted avg. life remaining	7 years 1 month 6 days