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Shareholders' Equity (Stock Options Outstanding And Exercisable) (Details) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Shares	16,712	18,069	19,237	20,461
Weighted Average Exercise Price (Per Share)	$ 37.63	$ 31.57	$ 28.71	$ 25.26
Weighted Average Remaining Contractual Life (Years)	6 years 3 months 18 days
Number of Shares	10,624	6,692	8,508
Weighted Average Exercise Price (Per Share)	$ 28.99
Exercise Price $14.62-15.77 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range	14.62
Upper range	$ 15.77
Number of Shares	2,178
Weighted Average Exercise Price (Per Share)	$ 15.45
Weighted Average Remaining Contractual Life (Years)	3 years 1 month 28 days
Number of Shares	2,178
Weighted Average Exercise Price (Per Share)	$ 15.45
Weighted Average Remaining Contractual Life (Years)	3 years 1 month 28 days
Exercise Price $17.65-21.05 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range	$ 17.65
Upper range	$ 21.05
Number of Shares	1,174
Weighted Average Exercise Price (Per Share)	$ 17.67
Weighted Average Remaining Contractual Life (Years)	2 years 3 days
Number of Shares	1,174
Weighted Average Exercise Price (Per Share)	$ 17.67
Weighted Average Remaining Contractual Life (Years)	2 years 3 days
Exercise Price $22.45-23.86 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range	$ 22.45
Upper range	$ 23.86
Number of Shares	3,432
Weighted Average Exercise Price (Per Share)	$ 23.19
Weighted Average Remaining Contractual Life (Years)	3 years 11 months 12 days
Number of Shares	3,422
Weighted Average Exercise Price (Per Share)	$ 23.19
Weighted Average Remaining Contractual Life (Years)	3 years 11 months 15 days
Exercise Price $27.03-39.15 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range	$ 27.03
Upper range	$ 39.15
Number of Shares	1,815
Weighted Average Exercise Price (Per Share)	$ 33.65
Weighted Average Remaining Contractual Life (Years)	6 years 1 month 2 days
Number of Shares	747
Weighted Average Exercise Price (Per Share)	$ 33.58
Weighted Average Remaining Contractual Life (Years)	6 years 1 month 2 days
Exercise Price $40.64-53.16 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range	$ 40.64
Upper range	$ 53.16
Number of Shares	4,190
Weighted Average Exercise Price (Per Share)	$ 45.49
Weighted Average Remaining Contractual Life (Years)	8 years 6 months 14 days
Number of Shares	2,095
Weighted Average Exercise Price (Per Share)	$ 45.49
Weighted Average Remaining Contractual Life (Years)	8 years 29 days
Exercise Price $53.34-71.12 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range	$ 53.34
Upper range	$ 71.12
Number of Shares	3,923
Weighted Average Exercise Price (Per Share)	$ 62.01
Weighted Average Remaining Contractual Life (Years)	9 years 18 days
Number of Shares	1,008
Weighted Average Exercise Price (Per Share)	$ 53.39
Weighted Average Remaining Contractual Life (Years)	8 years 1 month 20 days

X

- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ 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)(iii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

+ 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)(iii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=96867065&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

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-Publisher FASB
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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

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-Publisher FASB
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-SubTopic 10
-Section 50
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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, 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
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Weighted average remaining contractual term for option awards outstanding, 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
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-SubTopic 10
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-Paragraph 2
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