Share-Based Compensation (Schedule Of Information With Respect To Outstanding And Exercisable Stock Options) (Details) (USD $)					12 Months Ended
Dec. 31, 2011 years	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008	Dec. 31, 2011 Range Of Exercise Prices $13.32 - $13.32 [Member] years	Dec. 31, 2011 Range Of Exercise Prices $13.67 - $21.80 [Member] years	Dec. 31, 2011 Range Of Exercise Prices $22.04 - $22.13 [Member] years	Dec. 31, 2011 Range Of Exercise Prices $23.32 - $29.02 [Member] years	Dec. 31, 2011 Range Of Exercise Prices $29.35 - $29.73 [Member] years	Dec. 31, 2011 Range Of Exercise Prices $30.67 - $32.91 [Member] years	Dec. 31, 2011 Range Of Exercise Prices $33.04 - $34.70 [Member] years	Dec. 31, 2011 Range Of Exercise Prices $34.86 - $62.56 [Member] years	Dec. 31, 2011 Range Of Exercise Prices $64.12 - $64.12 [Member] years	Dec. 31, 2011 Range Of Exercise Prices $68.24 - $68.24 [Member] years
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum					$ 13.32	$ 13.67	$ 22.04	$ 23.32	$ 29.35	$ 30.67	$ 33.04	$ 34.86	$ 64.12	$ 68.24
Range of Exercise Prices, Maximum					$ 13.32	$ 21.80	$ 22.13	$ 29.02	$ 29.73	$ 32.91	$ 34.70	$ 62.56	$ 64.12	$ 68.24
Options Outstanding, Number of Options Outstanding	3,353,462	3,574,614	3,213,102	2,915,634	442,200	474,938	393,950	500,147	471,300	350,500	438,502	273,800	5,000	3,125
Options Outstanding, Weighted Average Exercise Price	$ 27.79	$ 28.29	$ 28.30	$ 29.29	$ 13.32	$ 19.65	$ 22.07	$ 27.46	$ 29.56	$ 30.88	$ 34.42	$ 55.35	$ 64.12	$ 68.24
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	4.33				2.46	7.01	6.02	5.16	1.14	6.18	3.95	2.56	2.30	2.43
Options Exercisable, Number Exercisable	2,764,948				412,325	261,619	309,950	294,827	471,300	294,500	438,502	273,800	5,000	3,125
Options Exercisable, Weighted Average Exercise Price	$ 28.50				$ 13.32	$ 18.00	$ 22.06	$ 26.95	$ 29.56	$ 30.92	$ 34.42	$ 55.35	$ 64.12	$ 68.24

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.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

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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

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

+ References

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The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan.

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-Publisher FASB

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-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.

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The weighted average period between the balance sheet date and expiration for all awards outstanding under the plan, which may be expressed in a decimal value for number of years.

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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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-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.

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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.

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