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Stockholders' Equity (Summary Of Options And Stock Appreciation Rights Outstanding By Range Of Exercise Price) (Details) - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options Outstanding 706,494 487,146
Weighted Average Remaining Life 8 years  
Weighted Average Exercise Price $ 9.34 $ 17.21
Number of Options Currently Exercisable 235,572  
Weighted Average Exercise Price per Vested Share $ 22.43  
$0.00 - $10.00 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Range of Exercise Prices, Lower Limit 0.00  
Range of Exercise Prices, Upper Limit $ 10.00  
Options Outstanding 607,749  
Weighted Average Remaining Life 8 years 8 months 1 day  
Weighted Average Exercise Price $ 3.07  
Number of Options Currently Exercisable 136,827  
Weighted Average Exercise Price per Vested Share $ 4.07  
$30.01 - $40.00 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Range of Exercise Prices, Lower Limit 30.01  
Range of Exercise Prices, Upper Limit $ 40.00  
Options Outstanding 61,495  
Weighted Average Remaining Life 4 years 11 months 12 days  
Weighted Average Exercise Price $ 34.89  
Number of Options Currently Exercisable 61,495  
Weighted Average Exercise Price per Vested Share $ 34.89  
$40.01 - $50.00 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Range of Exercise Prices, Lower Limit 40.01  
Range of Exercise Prices, Upper Limit $ 50.00  
Options Outstanding 12,250  
Weighted Average Remaining Life 3 years 5 months 9 days  
Weighted Average Exercise Price $ 43.90  
Number of Options Currently Exercisable 12,250  
Weighted Average Exercise Price per Vested Share $ 43.90  
$50.01 - $60.00 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Range of Exercise Prices, Lower Limit 50.01  
Range of Exercise Prices, Upper Limit $ 60.00  
Options Outstanding 12,250  
Weighted Average Remaining Life 2 years 4 months 28 days  
Weighted Average Exercise Price $ 54.90  
Number of Options Currently Exercisable 12,250  
Weighted Average Exercise Price per Vested Share $ 54.90  
$90.01+ [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Range of Exercise Prices, Lower Limit $ 90.01  
Options Outstanding 12,750  
Weighted Average Remaining Life 11 months 12 days  
Weighted Average Exercise Price $ 107.59  
Number of Options Currently Exercisable 12,750  
Weighted Average Exercise Price per Vested Share $ 107.59