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Common Stock And Stock Options (Summary Of Stock Option Activity) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Shares, Outstanding 928 1,438 1,385
Number of Shares, Options forfeited, cancelled or expired (4) (8) (30)
Number of Shares, Awards granted 79 98 303
Number of Shares, Awards exercised or vested (129) (600) (220)
Number of Shares, Outstanding 874 928 1,438
Weighted-average Exercise Price, Outstanding $ 6.25 $ 6.00 $ 6.54
Weighted-average Exercise Price, Awards forfeited, cancelled or expired 6.42 7.20 12.42
Weighted-average Exercise Price, Awards granted     7.28
Weighted-average Exercise Price, Awards exercised or vested 4.91 5.65 10.67
Weighted-average Exercise Price, Outstanding $ 6.39 $ 6.25 $ 6.00
Aggregate Intrinsic Value, Outstanding $ 10,965    
Number of Shares, Exercisable 668 576  
Weighted-average Exercise Price, Exercisable $ 6.30 $ 5.81  
Aggregate Intrinsic Value, Exercisable $ 7,819 $ 11,855  
Number of Shares, Available for future grant 183    
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Shares, Outstanding 830 1,438 1,385
Number of Shares, Options forfeited, cancelled or expired (3) (8) (30)
Number of Shares, Awards granted   0 303
Number of Shares, Awards exercised or vested (81) (600) (220)
Number of Shares, Outstanding 746 830 1,438
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Shares, Outstanding 98    
Number of Shares, Options forfeited, cancelled or expired (1)    
Number of Shares, Awards granted 79 98  
Number of Shares, Awards exercised or vested (48)    
Number of Shares, Outstanding 128 98