Stock-based Compensation (Stock Option Activity) (Details) $ / shares in Units, $ in Thousands	3 Months Ended
Mar. 31, 2020 USD ($) $ / shares shares
Stock-based Compensation [Abstract]
Outstanding, Number of Options \| shares	55,346
Outstanding, Weighted-Average Exercise Price \| $ / shares	$ 12.34
Exercised, Number of Options \| shares	(17,673)
Exercised, Weighted-Average Exercise Price \| $ / shares	$ 11.14
Forfeited or expired, Number of Options \| shares	(1,125)
Forfeited or expired, Weighted-Average Exercise Price \| $ / shares	$ 10.37
Outstanding, Number of Options \| shares	36,548
Outstanding, Weighted-Average Exercise Price \| $ / shares	$ 12.98
Outstanding, Weighted-Average Remaining Contractual Term	10 months 28 days
Outstanding, Aggregate Intrinsic Value \| $	$ 160
Exercisable, Number of Options \| shares	36,398
Exercisable, Weighted-Average Exercise Price \| $ / shares	$ 12.97
Exercisable, Weighted-Average Remaining Contractual Term	10 months 20 days
Exercisable, Aggregate Intrinsic Value \| $	$ 159

No definition available.

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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 price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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- Definition

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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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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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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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- Definition

Weighted average price at which option holders acquired shares when converting their stock options into shares.

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- Definition

Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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- Definition

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

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