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Stock-Based Compensation Plan (Summary Of Stock Option Activities) (Details) - Stock Options [Member] - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options outstanding at beginning of period, Number of Shares 859,560 1,428,255 1,189,255
Options granted, Number of Shares   230,500 245,000
Options exercised, Number of Shares (9,393)   (6,000)
Options forfeited/cancelled, Number of Shares   (799,195)  
Options outstanding at end of period, Number of Shares 850,167 859,560 1,428,255
Options exercisable, Number of Shares 657,471    
Expected to vest after end of period, Number of Shares 192,696    
Options outstanding at beginning of period, Weighted Average Exercise Price $ 16.44 $ 16.31 $ 18.08
Options granted, Weighted Average Exercise Price   16.80 7.87
Options exercised, Weighted Average Exercise Price 14.76   21.99
Options forfeited/cancelled, Weighted Average Exercise Price   16.31  
Options outstanding at end of period, Weighted Average Exercise Price 16.46 $ 16.44 $ 16.31
Options exercisable, Weighted Average Exercise Price 17.38    
Expected to vest after end of period, Weighted Average Exercise Price $ 13.33    
Weighted average remaining term 5 years 10 months 24 days    
Weighted average remaining term 5 years 3 months 18 days    
Expected to vest after end of period, Weighted Average Remaining Contractual Term (in years) 7 years 8 months 12 days    
Aggregate intrinsic value of options outstanding $ 5,936    
Options exercisable at end of period, Aggregate Intrinsic Value (in thousands) 4,028    
Expected to vest after end of period, Aggregate Intrinsic Value (in thousands) $ 1,907