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Stock Options And Restricted Stock Awards (Summary of Stock Option Activity and Weighted Average Exercise Price) (Details) - Stock Options [Member]	12 Months Ended
	Dec. 31, 2020 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, Outstanding, beginning of period shares	648,000
Options, Granted shares	0
Options, Exercised shares	(127,000)
Options, Forfeited/Cancelled shares	(15,000)
Options, Outstanding, end of period shares	506,000
Weighted Average Exercise Price, Outstanding, beginning of period | $ / shares	$ 37.43
Weighted Average Exercise Price, Exercised | $ / shares	31.07
Weighted Average Exercise Price, Forfeited/Cancelled | $ / shares	37.25
Weighted Average Exercise Price, Outstanding, end of period | $ / shares	$ 39.03

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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

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