Shareholders' Equity (Summary Of Stock Option Activity) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options Outstanding, Balance, beginning of period	1,850
Options Outstanding, Exercised	(3)
Options Outstanding, Forfeited/expired	(11)
Options Outstanding, Balance, end of period	1,836
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Weighted Avg Exercise Price, Balance beginning of period	$ 15.37
Weighted-Avg Exercise Price, Exercised	$ 10.94
Weighted-Avg Exercise Price, Forfeited/expired	$ 18.78
Weighted Avg Exercise Price, Balance, end of period	$ 15.36
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Options exercisable, end of year, Options Outstanding	1,362
Options exercisable, end of year, Weighted Avg. Exercise Price	$ 16.69
Weighted Avg Remaining Contractual Term	4 years 9 months 22 days
Options exercisable, end of period - Weighted-Avg Remaining Contractual Term	3 years 10 months 24 days
Aggregate Intrinsic Value	$ 1,958
Options exercisable, end of period - Aggregate Intrinsic Value	$ 1,131

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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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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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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Weighted average price of options that were either forfeited or expired.

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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 grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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

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