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Stock-Based Compensation (Summary Of Stock Option Activity) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012
Stock-Based Compensation [Abstract]
Options, Outstanding, Beginning Balance	1,224,699
Options, Exercised	(488,961)
Options, Outstanding and exercisable, Ending Balance	735,738
Weighted-Average Exercise Price, Outstanding, Beginning Balance	$ 21.64
Weighted-Average Exercise Price, Exercised	$ 20.90
Weighted-Average Exercise Price, Outstanding and exercisable, Ending Balance	$ 22.14
Weighted-Average Remaining Contractual Term (years), Outstanding and exercisable, Ending Balance	1.7
Aggregate Intrinsic Value, Outstanding and exercisable, Ending Balance	$ 5,478

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The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of vested portions of options outstanding and currently exercisable under the option plan as of the balance sheet date.

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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 period between the balance sheet date and expiration for all vested portions of options outstanding and currently exercisable (or convertible) under the plan, which may be expressed in a decimal value for number of years.

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

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