Employee Incentive, Deferred Compensation, And Retirement Plans (Summary Of Stock Option Activity) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2012
Employee Incentive, Deferred Compensation, And Retirement Plans [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Beginning Balance	983
Granted, Options
Exercised, Options	(727)
Forfeited, Options
Expired, Options	(7)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance	249
Outstanding, Weighted-average exercise price, Beginning balance	$ 9.38
Granted, Weighted-average exercise price
Exercised, Weighted-average exercise price	$ 5.74
Forfeited, Weighted-average exercise price
Expired, Weighted-average exercise price	$ 11.60
Outstanding, Weighted-average exercise price, Ending balance	$ 19.95
Outstanding, Weighted-average remaining contractual term	2 years 9 months 11 days
Outstanding, Aggregate intrinsic value	$ 4,126

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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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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Gross number of share options (or share units) granted during the period.

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

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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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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average price at which grantees can acquire the shares reserved for issuance on stock options awarded.

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

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