Stock-Based Compensation (Summary Of Stock Options By Exercise Price Range) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares, Outstanding	297,520
Outstanding, Average life	4 years 2 months 12 days
Outstanding, Average price (usd per share)	$ 68.63
Number of shares, Exercisable	257,075
Exercisable, Average price (usd per share)	$ 69.24
Under $46.80 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares, Outstanding	29,412
Outstanding, Average life	4 years 7 months 6 days
Outstanding, Average price (usd per share)	$ 37.18
Number of shares, Exercisable	28,412
Exercisable, Average price (usd per share)	$ 36.85
Exercise price range, Upper limit	$ 46.80
$57.34-$57.34 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares, Outstanding	64,495
Outstanding, Average life	6 years 2 months 12 days
Outstanding, Average price (usd per share)	$ 57.34
Number of shares, Exercisable	60,495
Exercisable, Average price (usd per share)	$ 57.34
Exercise price range, Lower limit	$ 57.34
Exercise price range, Upper limit	$ 57.34
$66.14-$66.14 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares, Outstanding	79,338
Outstanding, Average life	7 years 1 month 6 days
Outstanding, Average price (usd per share)	$ 66.14
Number of shares, Exercisable	43,893
Exercisable, Average price (usd per share)	$ 66.14
Exercise price range, Lower limit	$ 66.14
Exercise price range, Upper limit	$ 66.14
$74.47-$75.10 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares, Outstanding	13,750
Outstanding, Average life	3 years
Outstanding, Average price (usd per share)	$ 74.57
Number of shares, Exercisable	13,750
Exercisable, Average price (usd per share)	$ 74.57
Exercise price range, Lower limit	$ 74.47
Exercise price range, Upper limit	$ 75.10
$81.90-$81.90 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares, Outstanding	50,000
Outstanding, Average life	10 months 24 days
Outstanding, Average price (usd per share)	$ 81.90
Number of shares, Exercisable	50,000
Exercisable, Average price (usd per share)	$ 81.90
Exercise price range, Lower limit	$ 81.90
Exercise price range, Upper limit	$ 81.90
$83.12-$83.90 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares, Outstanding	27,200
Outstanding, Average life	1 year 1 month 6 days
Outstanding, Average price (usd per share)	$ 83.48
Number of shares, Exercisable	27,200
Exercisable, Average price (usd per share)	$ 83.48
Exercise price range, Lower limit	$ 83.12
Exercise price range, Upper limit	$ 88.33
$86.51-$86.51 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares, Outstanding	500
Outstanding, Average life	1 year 2 months 12 days
Outstanding, Average price (usd per share)	$ 86.51
Number of shares, Exercisable	500
Exercisable, Average price (usd per share)	$ 86.51
Exercise price range, Lower limit	$ 86.51
Exercise price range, Upper limit	$ 86.51
$83.12-$88.33 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares, Outstanding	23,575
Outstanding, Average life	2 months 12 days
Outstanding, Average price (usd per share)	$ 88.33
Number of shares, Exercisable	23,575
Exercisable, Average price (usd per share)	$ 88.33
Exercise price range, Lower limit	$ 83.12
Exercise price range, Upper limit	$ 88.33
$89.46-$89.46 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares, Outstanding	500
Outstanding, Average life	6 months
Outstanding, Average price (usd per share)	$ 89.46
Number of shares, Exercisable	500
Exercisable, Average price (usd per share)	$ 89.46
Exercise price range, Lower limit	$ 89.46
Exercise price range, Upper limit	$ 89.46
$93.65-$93.65 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares, Outstanding	8,750
Outstanding, Average life	2 years 1 month 6 days
Outstanding, Average price (usd per share)	$ 93.65
Number of shares, Exercisable	8,750
Exercisable, Average price (usd per share)	$ 93.65
Exercise price range, Lower limit	$ 93.65
Exercise price range, Upper limit	$ 93.65

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-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=6415400&loc=d3e5070-113901

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(iii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-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=6415400&loc=d3e5070-113901

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- Definition

The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-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=6415400&loc=d3e5070-113901

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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