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Share-Based Compensation (Summarized Information About RSU Awards Outstanding) (Details) - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
RSU Outstanding, RSUs 381,561  
RSU Awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
RSU Outstanding, RSUs 274,959 226,683
RSU Awards Outstanding, Weighted Average Remaining Contractual Life (Years) 1 year 8 months 12 days  
RSU Outstanding, Weighted Average Exercise Price $ 38.51 $ 45.66
RSU Vested, Weighted Average Exercise Price 51.71  
$32.25 - $42.99 | RSU Awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Range of Exercise Prices, Lower Range Limit 32.25  
Range of Exercise Prices, Upper Range Limit 42.99  
43.00 - 51.99 | RSU Awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Range of Exercise Prices, Lower Range Limit 43.00  
Range of Exercise Prices, Upper Range Limit 51.99  
Forty Point Zero Zero to Forty Two Point Ninety Nine [Member] | RSU Awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Range of Exercise Prices, Lower Range Limit 52.00  
Range of Exercise Prices, Upper Range Limit 71.56  
$32.25 - $71.56 | RSU Awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Range of Exercise Prices, Lower Range Limit 32.25  
Range of Exercise Prices, Upper Range Limit $ 71.56  
RSU Awards Outstanding, Weighted Average Remaining Contractual Life (Years) 1 year 9 months 18 days