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, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares, Outstanding	995
Outstanding, Average life	3 years 10 months 24 days
Outstanding, Average price (usd per share)	$ 74.87
Number of shares, Exercisable	814
Exercisable, Average price (usd per share)	$ 77.78
Under $57.34 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares, Outstanding	171
Outstanding, Average life	6 years 4 months 24 days
Outstanding, Average price (usd per share)	$ 47.90
Number of shares, Exercisable	98
Exercisable, Average price (usd per share)	$ 44.34
Exercise price range, Upper limit	$ 57.34
$57.88-$73.45 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares, Outstanding	197
Outstanding, Average life	4 years 4 months 24 days
Outstanding, Average price (usd per share)	$ 69.97
Number of shares, Exercisable	115
Exercisable, Average price (usd per share)	$ 72.75
Exercise price range, Lower limit	$ 57.88
Exercise price range, Upper limit	$ 73.45
$73.54-$81.40 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares, Outstanding	162
Outstanding, Average life	4 years 8 months 12 days
Outstanding, Average price (usd per share)	$ 74.91
Number of shares, Exercisable	136
Exercisable, Average price (usd per share)	$ 74.99
Exercise price range, Lower limit	$ 73.54
Exercise price range, Upper limit	$ 81.40
$81.90-$86.51 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares, Outstanding	167
Outstanding, Average life	2 years 9 months 18 days
Outstanding, Average price (usd per share)	$ 83.16
Number of shares, Exercisable	167
Exercisable, Average price (usd per share)	$ 83.16
Exercise price range, Lower limit	$ 81.90
Exercise price range, Upper limit	$ 86.51
$87.87-$88.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares, Outstanding	35
Outstanding, Average life	2 years 9 months 18 days
Outstanding, Average price (usd per share)	$ 87.96
Number of shares, Exercisable	35
Exercisable, Average price (usd per share)	$ 87.96
Exercise price range, Lower limit	$ 87.87
Exercise price range, Upper limit	$ 88.00
$88.33-$93.65 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares, Outstanding	263
Outstanding, Average life	2 years 3 months 18 days
Outstanding, Average price (usd per share)	$ 89.08
Number of shares, Exercisable	263
Exercisable, Average price (usd per share)	$ 89.08
Exercise price range, Lower limit	$ 88.33
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.

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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

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph 64

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: 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 Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(c)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: 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

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(a, b)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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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

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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

+ Details

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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

+ Details

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