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Stock-Based Compensation (Schedule Of Range Of Exercise Prices For Outstanding Options) (Details)
12 Months Ended
Dec. 31, 2017
$ / shares
shares
$7.12 - $9.65 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of exercise prices, minimum (in dollars per share) $ 7.12
Range of exercise prices, maximum (in dollars per share) $ 9.65
Options Outstanding | shares 300,366
Weighted Average Remaining Contractual Life (Years) 1 year 7 months 6 days
$10.26 - $18.05 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of exercise prices, minimum (in dollars per share) $ 10.26
Range of exercise prices, maximum (in dollars per share) $ 18.05
Options Outstanding | shares 167,582
Weighted Average Remaining Contractual Life (Years) 3 years 7 months 6 days
$22.92 - $30.05 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of exercise prices, minimum (in dollars per share) $ 22.92
Range of exercise prices, maximum (in dollars per share) $ 30.05
Options Outstanding | shares 316,601
Weighted Average Remaining Contractual Life (Years) 7 years 7 months 6 days
$40.38 - $52.35 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of exercise prices, minimum (in dollars per share) $ 40.38
Range of exercise prices, maximum (in dollars per share) $ 52.35
Options Outstanding | shares 285,553
Weighted Average Remaining Contractual Life (Years) 9 years 1 month 6 days
$61.87 - $68.18 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of exercise prices, minimum (in dollars per share) $ 61.87
Range of exercise prices, maximum (in dollars per share) $ 68.18
Options Outstanding | shares 199,499
Weighted Average Remaining Contractual Life (Years) 6 years 9 months 18 days