Stock-Based Compensation (Company's Activities With Respect To Its Stock Options) (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	9 Months Ended
Sep. 30, 2011 years
Stock-Based Compensation [Abstract]
Number of Shares Outstanding at December 31, 2010	3,780
Number of Shares Granted	578
Number of Shares Exercised	(395)
Number of Shares Canceled	(45)
Number of Shares Outstanding at September 30, 2011	3,918
Number of Shares Exercisable at September 30, 2011	2,267
Number of Shares Unvested at September 30, 2011	1,651
Weighted-Average Exercise Price Per Share Outstanding at December 31, 2010	$ 24.76
Weighted-Average Exercise Price Per Share Granted	$ 41.91
Weighted-Average Exercise Price Per Share Exercised	$ 19.87
Weighted-Average Exercise Price Per Share Canceled	$ 30.92
Weighted-Average Exercise Price Per Share Outstanding at September 30, 2011	$ 27.71
Weighted-Average Exercise Price Per Share Exercisable at September 30, 2011	$ 24.21
Weighted-Average Exercise Price Per Share Unvested at September 30, 2011	$ 32.52
Weighted-Average Remaining Contractual Life (in years) Outstanding at December 31, 2011	4.7
Weighted-Average Remaining Contractual Life (in years) Outstanding at September 30, 2011	4.31
Weighted-Average Remaining Contractual Life (in years) Exercisable at September 30, 2011	3.57
Weighted-Average Remaining Contractual Life (in years) Unvested at September 30, 2011	5.33

Number of options unvested at closing.

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Weighted-Average exercise price per option unvested at closing.

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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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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.

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The weighted average price at which option holders acquired shares when converting their stock options into shares under the plan during the reporting period.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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The weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated during the reporting period due to noncompliance with plan terms during the reporting period.

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Net number of share options (or share units) granted during the period.

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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 stock options awarded under the plan during the reporting period.

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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.

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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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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 weighted-average period between the balance sheet date and expiration date for fully vested and expected to vest options outstanding, which may be expressed in a decimal value for number of years.

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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.

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Number of share options (or share units) exercised during the current period.

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