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Shareholders' Equity (Stock Option Activity) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Stockholders' Equity Note [Abstract]
Options, beginning balance	365,495	249,911	266,005
Options, granted	141,928	137,010	119,925
Options, exercised	(5,500)	(9,674)	(124,918)
Options, forfeited	(36,676)	(11,752)	(11,101)
Options, ending balance	465,247	365,495	249,911
Options, exercisable	219,649
Weighted average exercise price, granted	$ 33.83	$ 36.11	$ 39.62
Weighted average exercise price, exercised	28.09	28.02	21.46
Weighted average exercise price, forfeited	35.88	36.73	33.18
Weighted average grant date fair value, granted	13.35	14.71	11.89
Weighted average grant date fair value, exercised	10.03	9.94	8.46
Weighted average grant date fair value, forfeited	$ 13.50	$ 13.05	$ 10.87

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Weighted Average Grant Date Fair Value

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Grant Date Fair Value

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

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

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