Shareholders' Equity (Summary Of Options Outstanding Separated Into Ranges Of Exercise Prices) (Details) - $ / shares	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Options outstanding, Number of options	905,000	965,000	0
Options outstanding, Weighted average exercise price per share	$ 128.45	$ 128.48	$ 0
$121.42 - $128.91
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Exercise price, Lower limit	128.91
Exercise price, Upper limit	$ 121.42
Options outstanding, Number of options	905,000
Options outstanding, Weighted average remaining contractual life (years)	3 years 11 months 12 days
Options outstanding, Weighted average exercise price per share	$ 128.45

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

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=116856206&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

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-Publisher FASB
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

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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- Definition

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

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