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Share-Based Compensation (Stock Option Activity) (Details) - Stock Options
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock Option Grant Price As Percent Of Market Price 100.00% 100.00% 100.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years 3 years 3 years
Weighted Average Exercise Price (in dollars per share):      
Stock option contractual term 10 years 10 years 10 years