Equity Incentive Plans (Summary Of Outstanding Options) (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended
Sep. 30, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	109,875
Options outstanding (in shares)	116,690	118,030
Weighted avg. life remaining (in years)	4 years 3 months 18 days
Weighted avg. exercise price	$ 56.36	$ 55.63
Aggregate intrinsic value	$ 0
Minimum [Member]
Option Price Per Share, Outstanding at Beginning of Period	$ 44.62	44.62
Maximum [Member]
Option Price Per Share, Outstanding at Beginning of Period	$ 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	27,215
Options outstanding (in shares)	27,215
Weighted avg. life remaining (in years)	1 year 7 months 6 days
Forty Four Point Sixty Two To Forty Nine Point Nine Nine [Member] \| Minimum [Member]
Option Price Per Share, Outstanding at Beginning of Period	$ 44.62
Forty Four Point Sixty Two To Forty Nine Point Nine Nine [Member] \| Maximum [Member]
Option Price Per Share, Outstanding at Beginning of Period	$ 49.99
Fifty To Fifty Nine Point Nine Nine Member
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	29,793
Options outstanding (in shares)	31,710
Weighted avg. life remaining (in years)	3 years 9 months 18 days
Fifty To Fifty Nine Point Nine Nine Member \| Minimum [Member]
Option Price Per Share, Outstanding at Beginning of Period	$ 50.00
Fifty To Fifty Nine Point Nine Nine Member \| Maximum [Member]
Option Price Per Share, Outstanding at Beginning of Period	$ 59.99
Sixty To Sixty Five Point Five Zero Member
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	50,719
Options outstanding (in shares)	53,609
Weighted avg. life remaining (in years)	5 years 8 months 12 days
Sixty To Sixty Five Point Five Zero Member \| Minimum [Member]
Option Price Per Share, Outstanding at Beginning of Period	$ 60.00
Sixty To Sixty Five Point Five Zero Member \| Maximum [Member]
Option Price Per Share, Outstanding at Beginning of Period	$ 69.99
Seventy To Seventy Six Point Six Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	2,148
Options outstanding (in shares)	4,156
Weighted avg. life remaining (in years)	7 years 3 months 18 days
Seventy To Seventy Six Point Six Three [Member] \| Minimum [Member]
Option Price Per Share, Outstanding at Beginning of Period	$ 70.00
Seventy To Seventy Six Point Six Three [Member] \| Maximum [Member]
Option Price Per Share, Outstanding at Beginning of Period	$ 76.63

Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Price Per Share

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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

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

+ References

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

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.

+ References

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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-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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