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Stock-Based Compensation (Summary Of Stock Option And Restricted Stock Awards Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Stock Options [Member]
Number of Outstanding
Outstanding at beginning	229,435	240,308
Granted/Awarded		83,513
Exercised/Released	(56,726)	(55,642)
Forfeited	(14,874)	(38,744)
Outstanding at ending	157,835	229,435
Weighted Average Exercise Price
Outstanding at beginning, Weighted Average Exercise Price	$ 26.33	$ 22.21
Granted/Awarded, Weighted Average Exercise Price		33.27
Exercised/Released, Weighted Average Exercise Price	24.15	21.69
Forfeited, Weighted Average Exercise Price	27.73	22.37
Outstanding at ending, Weighted Average Exercise Price	$ 26.98	$ 26.33
Aggregate Intrinsic Value
Outstanding, Options, Aggregate Intrinsic Value	$ 3,212	$ 1,860
Vested and Expected to Vest
Ending vested and expected to vest, Outstanding	156,467	226,219
Vested and expected to vest, Weighted Average Exercise Price	$ 27.06	$ 26.45
Vested and expected to vest, Aggregate Intrinsic Value	$ 3,172	$ 1,807
Exercisable, Outstanding	60,538	68,104
Exercisable, Weighted Average Exercise Price	$ 24.12	$ 21.30
Exercisable, Aggregate Intrinsic Value	$ 1,405	$ 895
Restricted Stock Awards [Member]
Number of Outstanding
Outstanding at beginning
Granted/Awarded	3,460	2,860
Exercised/Released	(3,460)	(2,860)
Forfeited
Outstanding at ending
Weighted Average Exercise Price
Outstanding at beginning, Weighted Average Exercise Price
Granted/Awarded, Weighted Average Exercise Price	43.28	34.81
Exercised/Released, Weighted Average Exercise Price	43.28	34.81
Forfeited, Weighted Average Exercise Price
Outstanding at ending, Weighted Average Exercise Price

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For presentations that combine terminations, 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 or that expired.

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Weighted average price of options that were either forfeited or expired.

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

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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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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable.

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The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date.

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As of the balance sheet date, the weighted-average exercise price (at which grantees can acquire the shares reserved for issuance) for exercisable stock options that are fully vested or expected to vest.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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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 per share amount at which grantees can acquire shares of common stock by exercise of options.

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