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Shareholders' Equity And Stock-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Aggregate number of shares of common stock for which awards can be granted 231   249
Shares purchased for award 3 1  
Stock option expense $ 329 $ 333  
Unrecognized compensation costs related to non-vested awards $ 2,176    
Unrecognized compensation costs related to non-vested awards, recognition period 1 year 10 months 28 days    
Total intrinsic value of options exercised $ 1,480    
Maximum number of shares approved under purchase plan 300    
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Share Price $ 26.61    
2006 Equity Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Aggregate number of shares of common stock for which awards can be granted 400    
Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Term of options 10 years