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Stock-Based Compensation (Option Activity) (Details) - Time-Vested Stock Options [Member] - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Outstanding at the beginning of the year (shares)	313,317	208,426
Options Outstanding, Granted (shares)		255,009
Options Outstanding, Exercised (shares)		0	0
Options Outstanding, Forfeited or expired (shares)	(101,956)	(150,118)
Options Outstanding, Outstanding at the end of the year (shares)	211,361	313,317	208,426
Options Outstanding, Exercisable at the end of the year (shares)	103,458	82,964
Weighted-Average Exercise Price, Outstanding at the beginning of the year (per share)	$ 12.70	$ 21.47
Weighted-Average Exercise Price, Granted (per share)		7.43
Weighted-Average Exercise Price, Forfeited or expired (per share)	14.81	15.93
Weighted-Average Exercise Price, Outstanding at the end of the year (per share)	11.68	12.70	$ 21.47
Weighted-Average Exercise Price, Exercisable at the end of the year (per share)	$ 14.93	$ 23.01

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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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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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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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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