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Stock-Based Compensation (Schedule Of Range Of Exercise Prices For Outstanding Options) (Details)
12 Months Ended
Dec. 31, 2015
$ / shares
shares
Range One [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Prices, Lower Limit $ 7.12
Range of Prices, Upper Limit $ 9.65
Options Outstanding | shares 304,200
Weighted Average Remaining Contractual Life (Years) 2 years 8 months 12 days
Range Two [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Prices, Lower Limit $ 10.26
Range of Prices, Upper Limit $ 18.05
Options Outstanding | shares 349,906
Weighted Average Remaining Contractual Life (Years) 2 years 7 months 6 days
Range Three [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Prices, Lower Limit $ 22.92
Range of Prices, Upper Limit $ 30.05
Options Outstanding | shares 191,292
Weighted Average Remaining Contractual Life (Years) 5 years 8 months 12 days
Range Four [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Prices, Lower Limit $ 40.38
Range of Prices, Upper Limit $ 52.35
Options Outstanding | shares 107,562
Weighted Average Remaining Contractual Life (Years) 7 years 3 months 18 days
Range Five [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Prices, Lower Limit $ 63.98
Range of Prices, Upper Limit $ 68.18
Options Outstanding | shares 314,830
Weighted Average Remaining Contractual Life (Years) 8 years 8 months 12 days