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Stock Option And Stock Award Plans (Summary Of Additional Information On Stock Options Outstanding And Exercisable) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Shares	3,125,944
Options Outstanding, Weighted Average, Remaining Contractual Life (Years)	4 years 2 months 12 days
Options Outstanding, Weighted Average, Exercise Price	$ 13.82
Options Outstanding, Aggregate Intrinsic Value	$ 792,082
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	1,762,190	1,287,792
Options Exercisable, Weighted Average Exercise Price	$ 14.36
Options Exercisable, Aggregate Intrinsic Value	$ 41,076
Dividend yield	2.60%	2.50%	2.40%
Weighted average volatility percentage	48.30%	43.80%	38.30%
Weighted average risk-free interest rate	0.90%	0.80%	2.40%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price		$ 10.75	$ 13.78
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	3,125,944	2,827,438	1,628,903	890,116
Estimated weighted average fair value of options per share at date of grant	$ 5.57	$ 4.44	$ 5.43
Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period, Fair Value	$ 2,165	$ 2,833	$ 4,117
Officers
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Holding period (years):	5 years	5 years	5 years
- To 15.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	$ 10.75
Range of Exercise Prices, Maximum	$ 16.37
Options Outstanding, Shares	2,953,052
Options Outstanding, Weighted Average, Remaining Contractual Life (Years)	4 years 4 months 24 days
Options Outstanding, Weighted Average, Exercise Price	$ 13.48
Options Outstanding, Aggregate Intrinsic Value	$ 792,082
Options Exercisable, Shares	1,589,298
Options Exercisable, Weighted Average Exercise Price	$ 13.78
Options Exercisable, Aggregate Intrinsic Value	$ 41,076
15.01 To 17.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	$ 17.29
Range of Exercise Prices, Maximum	$ 25.94
Options Outstanding, Shares	172,892
Options Outstanding, Weighted Average, Remaining Contractual Life (Years)	1 year 7 months 6 days
Options Outstanding, Weighted Average, Exercise Price	$ 19.71
Options Outstanding, Aggregate Intrinsic Value	$ 0
Options Exercisable, Shares	172,892
Options Exercisable, Weighted Average Exercise Price	$ 19.71
Options Exercisable, Aggregate Intrinsic Value	$ 0

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Rate of weighted-average expected volatility for award under share-based payment arrangement.

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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 grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Number of options outstanding, including both vested and non-vested options.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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