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Stock-Based Compensation Plans (Allocation Of Recognized Period Costs) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Total compensation expense $ 1,278 $ 816 $ 530
Stock Options And Restricted Stock Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Total compensation expense 543 306 296
Performance Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Total compensation expense 304 376 173
Restricted Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Total compensation expense $ 431 $ 134 $ 61