Shareholders' Equity (Summary Of Options Outstanding By Exercise Price Range) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2011
6.08-6.08 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price lower range limit	$ 6.08
Exercise price upper range limit	$ 6.08
Number of options, outstanding	1
Weighted average remaining contractual life, Outstanding (in years)	2.13
Weighted average exercise price, Outstanding	$ 6.08
Number of options, Exercisable	1
Weighted average remaining contractual life, Exercisable (in years)	2.13
Weighted average exercise price, Exercisable	$ 6.08
16.80-16.80 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price lower range limit	$ 16.80
Exercise price upper range limit	$ 16.80
Number of options, outstanding	2,200
Weighted average remaining contractual life, Outstanding (in years)	1.58
Weighted average exercise price, Outstanding	$ 16.80
Number of options, Exercisable	2,200
Weighted average remaining contractual life, Exercisable (in years)	1.58
Weighted average exercise price, Exercisable	$ 16.80
18.56-22.95 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price lower range limit	$ 18.56
Exercise price upper range limit	$ 22.95
Number of options, outstanding	447
Weighted average remaining contractual life, Outstanding (in years)	3.30
Weighted average exercise price, Outstanding	$ 21.71
Number of options, Exercisable	153
Weighted average remaining contractual life, Exercisable (in years)	2.48
Weighted average exercise price, Exercisable	$ 21.64
23.19-23.65 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price lower range limit	$ 23.19
Exercise price upper range limit	$ 23.65
Number of options, outstanding	3,951
Weighted average remaining contractual life, Outstanding (in years)	1.81
Weighted average exercise price, Outstanding	$ 23.44
Number of options, Exercisable	3,112
Weighted average remaining contractual life, Exercisable (in years)	2.06
Weighted average exercise price, Exercisable	$ 23.50
24.01-26.47 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price lower range limit	$ 24.01
Exercise price upper range limit	$ 26.47
Number of options, outstanding	2,225
Weighted average remaining contractual life, Outstanding (in years)	4.13
Weighted average exercise price, Outstanding	$ 25.25
Number of options, Exercisable	1,625
Weighted average remaining contractual life, Exercisable (in years)	4.08
Weighted average exercise price, Exercisable	$ 25.11
26.77-29.49 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price lower range limit	$ 26.77
Exercise price upper range limit	$ 29.49
Number of options, outstanding	1,965
Weighted average remaining contractual life, Outstanding (in years)	5.37
Weighted average exercise price, Outstanding	$ 29.12
Number of options, Exercisable	825
Weighted average remaining contractual life, Exercisable (in years)	5.46
Weighted average exercise price, Exercisable	$ 29.41
32.31-35.79 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price lower range limit	$ 32.31
Exercise price upper range limit	$ 35.79
Number of options, outstanding	399
Weighted average remaining contractual life, Outstanding (in years)	5.22
Weighted average exercise price, Outstanding	$ 34.83
Number of options, Exercisable	87
Weighted average remaining contractual life, Exercisable (in years)	5.22
Weighted average exercise price, Exercisable	$ 34.87
43.95-46.01 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price lower range limit	$ 43.95
Exercise price upper range limit	$ 46.01
Number of options, outstanding	49
Weighted average remaining contractual life, Outstanding (in years)	5.98
Weighted average exercise price, Outstanding	$ 45.00
Number of options, Exercisable	6
Weighted average remaining contractual life, Exercisable (in years)	5.86
Weighted average exercise price, Exercisable	$ 43.95
51.98-59.59 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price lower range limit	$ 51.98
Exercise price upper range limit	$ 59.59
Number of options, outstanding	2,100
Weighted average remaining contractual life, Outstanding (in years)	6.38
Weighted average exercise price, Outstanding	$ 53.00
Number of options, Exercisable	420
Weighted average remaining contractual life, Exercisable (in years)	6.39
Weighted average exercise price, Exercisable	$ 53.05
6.08-59.59 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price lower range limit	$ 6.08
Exercise price upper range limit	$ 59.59
Number of options, outstanding	13,337
Weighted average remaining contractual life, Outstanding (in years)	3.57
Weighted average exercise price, Outstanding	$ 28.50
Number of options, Exercisable	8,429
Weighted average remaining contractual life, Exercisable (in years)	2.92
Weighted average exercise price, Exercisable	$ 24.21

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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- Definition

The weighted average remaining life of the exercisable 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 (e)(2)

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

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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 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.

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)(1)(i)-(ii)

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

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Period Type:	instant

- 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

The weighted-average period remaining as of the balance sheet date until option expiration pertaining to the outstanding stock options for all option plans in the customized range of exercise prices, which may be expressed in a variety of ways (for example, years, months).

+ 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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Balance Type:	na
Period Type:	instant

- 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

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