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Stock-Based Compensation (Schedule Of Range Of Exercise Prices For Outstanding Options) (Details)
12 Months Ended
Dec. 31, 2019
$ / shares
shares
$10.26 - $30.05  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit $ 10.26
Share-based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit $ 30.05
Options Outstanding | shares 264,334
Weighted Average Remaining Contractual Life (Years) 1 year
$40.38 - $44.42  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit $ 40.38
Share-based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit $ 44.42
Options Outstanding | shares 218,047
Weighted Average Remaining Contractual Life (Years) 6 years 1 month 6 days
$45.70 - $61.87  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit $ 45.70
Share-based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit $ 61.87
Options Outstanding | shares 295,620
Weighted Average Remaining Contractual Life (Years) 6 years 6 months
$63.98 - $68.18  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit $ 63.98
Share-based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit $ 68.18
Options Outstanding | shares 145,171
Weighted Average Remaining Contractual Life (Years) 4 years 8 months 12 days
$79.83 - $107.75  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit $ 79.83
Share-based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit $ 107.75
Options Outstanding | shares 462,776
Weighted Average Remaining Contractual Life (Years) 8 years 9 months 18 days