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Employee Benefits And Stock-Based Compensation (Summary Of Unvested RSUs Activity) (Details) - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unvested at beginning of period, Shares 1,588    
Granted, Shares 474    
Vested and settled, Shares (862)    
Forfeited, Shares (93)    
Unvested at end of period, Shares 1,222 1,588  
Unvested at beginning of period, Weighted-Average Grant-Date Fair Value $ 74.69    
Granted, Weighted-Average Grant-Date Fair Value $ 112.74 $ 83.91 $ 81.59
Performance achievement adjustment 115    
Weighted average grant date value Performance adjustment $ 38.10    
Vested and settled, Weighted-Average Grant-Date Fair Value 66.37    
Forfeited, Weighted-Average Grant-Date Fair Value 88.43    
Unvested at end of period, Weighted-Average Grant-Date Fair Value $ 90.88 $ 74.69