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Stock Incentive Plan (Schedule Of SSAR Exercise Price Range, Number Of Shares, Weighted Average Exercise Price And Remaining Contractual Lives) (Details) - Stock Appreciation Rights (SARs) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
SSARs Outstanding (in shares)	403,150	759,675
SSARs Exercisable, Exercisable as of December 31 (in shares)	170,125
SSARs Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 63.71
Range of Exercise Prices
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Range of Exercise Prices, lower limit (in dollars per share)	43.88
Range of Exercise Prices, upper limit (in dollars per share)	$ 62.85
SSARs Outstanding (in shares)	142,106
SSAR Outstanding, Weighted Average Remaining Contractual Life (Years)	3 years 8 months 23 days
SSARs Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 60.52
SSARs Exercisable, Exercisable as of December 31 (in shares)	68,756
SSARs Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 58.04
Range of Exercise Prices
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Range of Exercise Prices, lower limit (in dollars per share)	63.47
Range of Exercise Prices, upper limit (in dollars per share)	$ 73.14
SSARs Outstanding (in shares)	261,044
SSAR Outstanding, Weighted Average Remaining Contractual Life (Years)	4 years 2 months 15 days
SSARs Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 69.66
SSARs Exercisable, Exercisable as of December 31 (in shares)	101,369
SSARs Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 67.56

X

- Definition

The number of share-based awards that were exercisable as of the reporting date, excluding options.

+ References

No definition available.

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- Definition

The weighted average exercise price of share-based awards that were exercisable as of the reporting date, excluding options.

+ References

No definition available.

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- Definition

Weighted average exercise price for equity-based awards excluding options.

+ References

No definition available.

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- Definition

Weighted average remaining contractual term for equity-based awards excluding options, 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
-Subparagraph (e)(1)
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- Definition

Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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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

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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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- Definition

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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