Share-Based Payment Arrangements (Summary of the Status of Stock Options) (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018
Share-Based Payment Arrangements [Abstract]
Stock Options, Outstanding at January 1, 2019	244,157
Stock options, Granted	0	0
Stock Options, Exercised	(230,000)
Stock Options, Forfeited or Expired
Stock Options, Outstanding at June 30,2019	14,157
Stock Options, Exercisable at June 30, 2019	14,157
Weighted Average Exercise Price, Outstanding at January 1, 2019	$ 6.63
Weighted Average Exercise Price, Exercised	6.61
Weighted Average Exercise Price, Forfeited or Expired
Weighted Average Exercise Price, Outstanding at June 30, 2019	6.99
Weighted Average Exercise Price, Exercisable at June 30, 2019	$ 6.99
Average Remaining Contractual Term, Outstanding at June 30, 2019	2 years 6 months
Average Remaining Contractual Term, Exercisable at June 30, 2019	2 years 6 months
Aggregate Intrinsic Value, Outstanding at June 30, 2019	$ 102
Aggregate Intrinsic Value, Exercisable at June 30, 2019	$ 102

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

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

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

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