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Stock-Based Compensation Plan (Summary Of Fair Value Weighted Average Assumptions) (Details) - Stock Options [Member] - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock price     $ 16.80
Exercise price     $ 16.80
Dividend yield (%)
Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected term (years)     5 years 6 months
Expected volatility (%)     56.40%
Risk-free interest rate (%)     1.77%
Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected term (years)     6 years 3 months
Expected volatility (%)     57.50%
Risk-free interest rate (%)     2.14%