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Stock Compensation Plans (Stock Plans and Stock Options) (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Apr. 25, 2012
May 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares authorized       4,500,000 2,000,000
Stock-based compensation expense $ 1,800,000 $ 12,500,000 $ 1,500,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]          
Number of shares outstanding at beginning of period 2,799,793        
Number of shares granted 157,350        
Number of shares exercised (4,168)        
Number of shares canceled and expired (50,267)        
Number of shares outstanding at end of period 2,902,708 2,799,793      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]          
Weighted average remaining life, outstanding 5 years 4 months 7 days        
Intrinsic value, outstanding 917,283        
Number of shares vested and expected to vest 2,867,115        
Weighted average exercise price, vested and expected to vest $ 4.28        
Weighted average remaining life, vested and expected to vest 5 years 4 months 7 days        
Intrinsic value, vested and expected to vest 912,441        
Number of shares exercisable 2,084,125        
Weighted average exercise price, exercisable $ 4.48        
Weighted average remaining life, exercisable 4 years 9 months 28 days        
Intrinsic value, exercisable 805,913        
Fair value of vested stock options 700,000 2,500,000 1,500,000    
Total intrinsic value of stock options exercised 3,000 315,000 19,600,000    
Number of unvested performance-based stock options 500,000 500,000      
Stock Options
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expected volatility 77.00% 76.00% 80.00%    
Expected dividend yield 0.00% 0.00% 0.00%    
Risk-free interest rate   1.94% 2.16%    
Expected life from grant date 6 years 6 years 5 years    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]          
Weighted average exercise price outstanding at beginning of period $ 4.39        
Weighted average exercise price, granted $ 2.67        
Weighted average exercise price, exercised $ 1.89        
Weighted average exercise price, canceled and expired $ 5.95        
Weighted average exercise price outstanding at end of period $ 4.28 $ 4.39      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]          
Unrecognized stock-based compensation cost, net of estimated forfeitures $ 734,000        
Weighted average remaining requisite service period (in years) 11 months 21 days        
Stock Options | Minimum [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Risk-free interest rate 0.98%        
Stock Options | Maximum [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Risk-free interest rate 1.24%