Stock Compensation (Schedule of Changes in Number of Outstanding Stock Options Under Director Plan, Stock Plan and 2011 Incentive Plan) (Details) - $ / shares	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Stock Compensation [Abstract]
Options, Outstanding - December 31,	1,172,659	922,930
Options, Awarded	278,665	288,186
Options, Exercised	0	0
Options, Forfeited	(70,832)	(38,457)
Options, Outstanding - December 31,	1,380,492	1,172,659	922,930
Options, Exercisable at December 31, 2018	920,556
Options, Expected to vest December 31, 2018	1,380,492
Weighted average exercise price per share, Outstanding - December 31,	$ 8.63	$ 10.10
Weighted average exercise price per share, Awarded	3.43	4.35
Weighted average exercise price per share, Forfeited	8.56	11.61
Weighted average exercise price per share, Outstanding - December 31,	7.56	$ 8.63	$ 10.10
Weighted average exercise price per share, Exercisable at December 31, 2018	9.14
Weighted average exercise price per share, Expected to vest December 31, 2018	$ 7.56
Options, Outstanding - Weighted average remaining contractual term (in years)	4 years 2 months 5 days	4 years 6 months 18 days	4 years 10 months 24 days
Options, Exercisable - Weighted average remaining contractual term (in years)	3 years 5 months 5 days
Options, Expected to vest - Weighted average remaining contractual term (in years)	4 years 2 months 5 days

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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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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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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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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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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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