Share-Based Payment Plans (Summary of Stock Option Activity) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended
Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Shares Under Option, Outstanding at the beginning of year	3,565
Shares Under Option, Granted	0
Shares Under Option, Exercised	(35)
Shares Under Option, Forfeited or expired	(2)
Shares Under Option, Outstanding at the end of period	3,528
Shares Under Option, Exercisable at the end of period	2,948
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Weighted-Average Exercise Price, Outstanding at the beginning of year (in usd per share)	$ 20.62
Weighted-Average Exercise Price, Granted (in usd per share)	$ 0.00
Weighted-Average Exercise Price, Exercised (in usd per share)	$ 11.59
Weighted-Average Exercise Price, Forfeited or expired (in usd per share)	$ 18.88
Weighted-Average Exercise Price, Outstanding at the end of period (in usd per share)	$ 20.72
Weighted-Average Exercise Price, Exercisable at the end of period (in usd per share)	$ 21.25

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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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 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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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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