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Shareholders' Equity And Stock-Based Compensation (Summary Of Stock Option Activity) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
9 Months Ended
Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares, Outstanding 874
Number of Shares, Awards granted 100
Number of Shares, Awards exercised or released (105)
Number of Shares, Outstanding 869
Number of Shares, Exercisable 697
Number of Shares, Available for future grant at beginning of period 183
Number of Shares, Available for future grant at end of period 117
Weighted-average Exercise Price, Outstanding [1] $ 6.39
Weighted-average Exercise Price, Awards exercised or released [1] 4.72
Weighted-average Exercise Price, Outstanding [1] 6.51
Weighted-average Exercise Price, Exercisable [1] $ 6.51
Aggregate Intrinsic Value, Outstanding $ 6,045
Aggregate Intrinsic Value, Exercisable $ 3,950
Stock Options [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares, Outstanding 746
Number of Shares, Awards exercised or released (49)
Number of Shares, Outstanding 697
Number of Shares, Exercisable 697
Restricted Stock Units (RSUs) [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares, Outstanding 128
Number of Shares, Awards granted 100
Number of Shares, Awards exercised or released (56)
Number of Shares, Outstanding 172
[1] The weighted average exercise price calculation does not include outstanding RSUs