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Shareholders' Equity And Stock-Based Compensation (Summary Of Stock Option Activity) (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
$ / shares
shares
Sep. 30, 2019
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Shares, Outstanding   928
Number of Shares, Options forfeited, cancelled or expired   (3)
Number of Shares, Awards granted   79
Number of Shares, Awards exercised or vested   (128)
Number of Shares, Outstanding 876 876
Number of Shares, Exercisable 670 670
Number of Shares, Available for future grant at beginning of period   249
Number of Shares, Available for future grant at end of period 183 183
Weighted-average Exercise Price, Outstanding | $ / shares   $ 6.25
Weighted-average Exercise Price, Awards forfeited, cancelled or expired | $ / shares   6.42
Weighted-average Exercise Price, Awards exercised or vested | $ / shares   4.87
Weighted-average Exercise Price, Outstanding | $ / shares $ 6.39 6.39
Weighted-average Exercise Price, Exercisable | $ / shares $ 6.30 $ 6.30
Aggregate Intrinsic Value, Outstanding | $ $ 12,241 $ 12,241
Aggregate Intrinsic Value, Exercisable | $ $ 8,799 $ 8,799
Stock Options [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Shares, Outstanding   830
Number of Shares, Options forfeited, cancelled or expired   (3)
Number of Shares, Awards exercised or vested   (79)
Number of Shares, Outstanding 748 748
Number of Shares, Exercisable 670 670
Restricted Stock Units (RSUs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Shares, Outstanding   98
Number of Shares, Awards granted 4 79
Number of Shares, Awards exercised or vested   (49)
Number of Shares, Outstanding 128 128