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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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Aggregate number of shares of common stock for which awards can be granted 230   230   404
Weighted average fair value of options granted $ 8.80 $ 5.85 $ 7.40 $ 7.08  
Estimated forfeiture rate of stock options     0.00%    
Weighted average remaining contractual life of options exercisable, years     4 years 3 months 22 days    
Stock option expense $ 207 $ 166 $ 425 $ 347  
Unrecognized compensation costs related to non-vested awards $ 1,309   $ 1,309    
Unrecognized compensation costs related to non-vested awards, recognition period     2 years 15 days    
Proceeds from equity offering, net of offering costs       $ 3,697  
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 1,256   1,256    
2006 & 2015 Equity Incentive Plans [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period of options under equity incentive plan     3 years    
Employee Stock Purchase Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares purchased for award 3 5 7 9  
Maximum [Member] | 2006 & 2015 Equity Incentive Plans [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