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Stock-Based Compensation (Summary Of Stock Option Activity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Stock-Based Compensation [Abstract]    
Shares, Outstanding at beginning of year 539,256  
Shares Cancelled or Forfeited  
Shares Expired (200) (300)
Shares, Outstanding at end of year 539,056  
Shares, Expected to vest  
Shares, Exercisable at end of period 539,056  
Weighted Average Exercise Price, Outstanding at Beginning Balance $ 1.44  
Weighted Average Exercise Price, Expired 20.15  
Weighted Average Exercise Price, Cancelled or Forfeited  
Weighted Average Exercise Price, Outstanding at Ending Balance 1.43  
Weighted Average Exercise Price, Expected to Vest  
Weighted Average Exercise Price, Exercisable at end of period $ 1.43  
Outstanding at end of period 5 years 1 month 6 days  
Exercisable at end of period 5 years 1 month 6 days  
Intrinsic value, Outstanding at end of year $ 501,460  
Intrinsic value, Expected to vest  
Intrinsic value, Exercisable at end of period $ 501,460