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Convertible Preferred Stock And Stockholders' Equity (Summary Of Options And Stock Appreciation Rights Outstanding By Range Of Exercise Price) (Details) - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Stock Options And Stock Appreciation Rights [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options Outstanding 671,887 706,494
Weighted Average Remaining Life 7 years 22 days  
Weighted Average Exercise Price $ 8.77 $ 9.34
Number of Options Currently Exercisable 429,029  
Weighted Average Exercise Price per Vested Share $ 12.15  
$0.00 - $10.00 [Member] | Stock Options And Stock Appreciation Rights [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Range of Exercise Price, Lower Limit 0.00  
Range of Exercise Price, Upper Limit $ 10.00  
Options Outstanding 581,142  
Weighted Average Remaining Life 7 years 8 months 1 day  
Weighted Average Exercise Price $ 3.07  
Number of Options Currently Exercisable 338,284  
Weighted Average Exercise Price per Vested Share $ 3.26  
$30.01 - $40.00 [Member] | Stock Options And Stock Appreciation Rights [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Range of Exercise Price, Lower Limit 30.01  
Range of Exercise Price, Upper Limit $ 40.00  
Options Outstanding 58,745  
Weighted Average Remaining Life 4 years 11 days  
Weighted Average Exercise Price $ 34.86  
Number of Options Currently Exercisable 58,745  
Weighted Average Exercise Price per Vested Share $ 34.86  
$40.01 - $50.00 [Member] | Stock Options And Stock Appreciation Rights [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Range of Exercise Price, Lower Limit 40.01  
Range of Exercise Price, Upper Limit $ 50.00  
Options Outstanding 12,250  
Weighted Average Remaining Life 2 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] | Stock Options And Stock Appreciation Rights [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Range of Exercise Price, Lower Limit 50.01  
Range of Exercise Price, Upper Limit $ 60.00  
Options Outstanding 12,250  
Weighted Average Remaining Life 1 year 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 Price, Lower Limit $ 90.01  
$90.01+ [Member] | Stock Options And Stock Appreciation Rights [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options Outstanding 7,500  
Weighted Average Remaining Life 3 months 29 days  
Weighted Average Exercise Price $ 113.60  
Number of Options Currently Exercisable 7,500  
Weighted Average Exercise Price per Vested Share $ 113.60