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Shareholders' Equity (Stock-based Compensation Expense) (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
May 31, 2009
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options, grants in period, weighted average grant date fair value   $ 0.93 $ 2.23
Nonvested awards, total compensation cost not yet recognized   $ 5,391  
Nonvested awards, total compensation cost not yet recognized, period for recognition   1 year 1 month 2 days  
Stock Option Plans:      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected dividend yield   0.00% 0.00%
Minimum | 2006 Plan | Stock Option Plans:      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Plan modification, contractual life 6 years