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Shareholders' Equity And Stock-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Mar. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Aggregate number of shares of common stock for which awards can be granted 215   215     251
Number of Shares, Options granted     98      
Stock option expense $ 333 $ 207 $ 667 $ 425    
Unrecognized compensation costs related to non-vested awards $ 2,639   $ 2,639      
Unrecognized compensation costs related to non-vested awards, recognition period     2 years 3 months 11 days      
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      
Number of Shares, Options granted 11   98      
Share Price $ 20.61   $ 20.61   $ 23.50  
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 763   763      
Employee Stock Purchase Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares purchased for award 1 3 4 7    
Maximum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Term of options     10 years      
Maximum [Member] | Employee Stock Purchase Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Maximum number of shares approved under purchase plan 300   300