Share-Based Compensation (Summary Of Stock Option Activity) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	6 Months Ended
Jun. 30, 2011
Share-Based Compensation
Shares, Beginning Balance	3,132
Shares, Granted	222
Shares, Exercised	(644)
Shares, Forfeited	(223)
Shares, Ending Balance	2,487
Shares, Exercisable	1,431
Shares, Vested and expected to vest	2,441
Weighted Average Exercise Price, Beginning Balance	$ 26.23
Weighted Average Exercise Price, Granted	$ 36.45
Weighted Average Exercise Price, Exercised	$ 15.23
Weighted Average Exercise Price, Forfeited	$ 26.73
Weighted Average Exercise Price, Ending Balance	$ 29.97
Weighted Average Exercise Price, Exercisable	$ 36.29
Weighted Average Exercise Price, Vested and expected to vest	$ 30.13
Weighted Average Remaining Life, Ending Balance, in years	5.7
Weighted Average Remaining Life, Exercisable, in years	3.9
Weighted Average Remaining Life, Vested and expected to vest, in years	5.1
Aggregate Intrinsic Value, Ending Balance	$ 19,637
Aggregate Intrinsic Value, Exercisable	6,637
Aggregate Intrinsic Value, Vested and expected to vest	$ 21,830

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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 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.

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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 total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices pertaining to options outstanding under the plan as of the balance sheet date.

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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 that are exercisable (or convertible) under the plan, which may be expressed in a decimal value for number of years.

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As of the balance sheet date, the total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of fully vested and expected to vest options outstanding.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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

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