Stock-Based Compensation Plan (Schedule Of Total Non-Cash Stock Compensation Expense Related To Stock Options And Restricted Stock) (Details) - USD ($) $ in Thousands  | 
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017  | 
Dec. 31, 2016  | 
Dec. 31, 2015  | 
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| Stock-Based Compensation Plan [Abstract] | |||
| Restricted stock | $ 658 | $ 15 | $ 264 | 
| Stock options | 523 | 212 | 830 | 
| Total non-cash stock compensation expense | $ 1,181 | $ 227 | $ 1,094 | 
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- References No definition available. 
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- Definition The noncash expense that represents the cost of restricted stock or unit distributed to employees as compensation. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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