Equity Compensation Plans (Stock Option And SSAR Activity) (Details) (Stock Options And SSAR's [Member], USD $) In Thousands, except Per Share data	9 Months Ended
Sep. 30, 2011
Stock Options And SSAR's [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning Balance, Options/SSARs	1,440
Granted, Options/SSARs	78
Exercised, Options/SSARs	(421)
Ending Balance, Options/SSARs	1,097
Beginning Balance, Weighted Average Exercise Price	$ 37.46
Granted, Weighted Average Exercise Price	$ 62.13
Exercised, Weighted Average Exercise Price	$ 37.63
Ending Balance, Weighted Average Exercise Price	$ 39.09

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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.

+ References

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

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