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Common Stock and Stock-Based Awards Plans (Summary Of Stock Options) (Details) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) $ / shares shares
Common Stock and Stock-Based Awards Plans
Number of Options, Outstanding, Beginning balance | shares	270
Number of Options, Exercised | shares	(19)
Number of Options, Outstanding, Ending balance | shares	251
Weighted-Average Exercise Price, Outstanding, Beginning balance | $ / shares	$ 20.02
Weighted-Average Exercise Price, Exercised | $ / shares	22.82
Weighted-Average Exercise Price, Outstanding, Ending balance | $ / shares	$ 19.80
Weighted-Average Remaining Contractual Term (Years), Outstanding	3 years 1 month 28 days
Aggregate Intrinsic Value, Outstanding as of March 31, 2020 | $	$ 406

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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

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