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Share-Based Compensation (Summarized Information About RSU Awards Outstanding) (Details) - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
RSU Outstanding, RSUs 206,685      
RSU Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
RSU Outstanding, RSUs 138,761 109,281 115,949 176,084
RSU Outstanding, Weighted Average Exercise Price $ 46.60 $ 52.90 $ 52.97 $ 44.39
RSU Vested, RSUs 3,040 1,200 250  
RSU Vested, Weighted Average Exercise Price $ 60.92 $ 59.29 $ 42.12  
$38.89 - $74.65 | RSU Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Range of Exercise Prices, Lower Range Limit 38.89      
Range of Exercise Prices, Upper Range Limit $ 50.99      
RSU Outstanding, RSUs 79,092      
RSU Awards Outstanding, Weighted Average Remaining Contractual Life (Years) 1 year 10 months 7 days      
RSU Outstanding, Weighted Average Exercise Price $ 39.17      
51.00 - 60.99 | RSU Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Range of Exercise Prices, Lower Range Limit 51.00      
Range of Exercise Prices, Upper Range Limit $ 60.99      
RSU Outstanding, RSUs 46,472      
RSU Awards Outstanding, Weighted Average Remaining Contractual Life (Years) 1 year 7 months      
RSU Outstanding, Weighted Average Exercise Price $ 52.42      
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 61.00      
Range of Exercise Prices, Upper Range Limit $ 74.65      
43.00 - 79.33 | RSU Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
RSU Outstanding, RSUs 13,197      
RSU Awards Outstanding, Weighted Average Remaining Contractual Life (Years) 5 months 10 days      
RSU Outstanding, Weighted Average Exercise Price $ 70.59      
$38.89 - $74.65 | RSU Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Range of Exercise Prices, Lower Range Limit 38.89      
Range of Exercise Prices, Upper Range Limit $ 74.65      
RSU Outstanding, RSUs 138,761      
RSU Awards Outstanding, Weighted Average Remaining Contractual Life (Years) 1 year 7 months 16 days      
RSU Outstanding, Weighted Average Exercise Price $ 46.59