Equity-Based Compensation Plans And Employee Benefit Plans (Reconciliation Of Rights Activity) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract]
Outstanding at December 31, 2011, Rights	662,484
Exercised during 2012, Rights	(264,060)
Forfeited or expired during 2012, Rights	(13,618)
Outstanding at December 31, 2012, Rights	384,806
Exercisable at December 31, 2012, Rights	351,051
Outstanding at December 31, 2011, Weighted Average Strike Price	$ 17.97
Exercised during 2012, Weighted Average Strike Price	$ 18.85
Forfeited or expired during 2012, Weighted Average Strike Price	$ 18.91
Outstanding at December 31, 2012, Weighted Average Strike Price	$ 17.25
Exercisable at December 31, 2012, Weighted Average Strike Price	$ 17.66
Outstanding at December 31, 2012, Weighted Average Contractual Remaining Term (Yrs)	4 years 9 months 30 days
Exercisable at December 31, 2012, Weighted Average Contractual Remaining Term (Yrs)	4 years 8 months 15 days
Outstanding at December 31, 2012, Aggregate Intrinsic Value	$ 7,099
Exercisable at December 31, 2012, Aggregate Intrinsic Value	$ 6,332

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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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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 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 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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