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Stock Benefit Plans Narrative (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense not yet recognized $ 3,400,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 0 years 10 months 21 days    
Proceeds from stock options exercised $ 0 $ 0 $ 29,000
Stock Options
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Equity-based awards outstanding (in shares) 64,000 65,000  
Stock Options | 2004 Plan
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Option term (in years) 7 years    
Equity-based awards outstanding (in shares) 149,545    
Stock Options | 2004 Plan | Employees Who Own More Than 10% of the Voting Power of All Classes of Stock
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Option term (in years) 5 years    
Ownership in voting powers ( as a percent) 10.00%    
Exercise price as a percentage of fair value of common stock (as a percent) 110.00%    
Stock Options | 2004 Plan | Other Employees and Consultants
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercise price as a percentage of fair value of common stock (as a percent) 100.00%    
Stock Options | 2004 Plan | Other Employees and Consultants | Minimum
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercise price as a percentage of fair value of common stock (as a percent) 85.00%    
Stock Options | 2006 Plan
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Option term (in years) 10 years    
Exercise price as a percentage of fair value of common stock (as a percent) 100.00%    
Equity-based awards outstanding (in shares) 56,539    
Stock Appreciation Rights (SARs) | 2004 Plan
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Option term (in years) 7 years    
Exercise price as a percentage of fair value of common stock (as a percent) 100.00%    
Stock Appreciation Rights (SARs) | 2006 Plan
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Option term (in years) 10 years    
Exercise price as a percentage of fair value of common stock (as a percent) 100.00%    
Restricted Stock | 2004 Plan
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Purchase price (in dollars per share) $ 0.001    
Common Stock | 2004 Plan
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares reserved for future issuance (in shares) 1,805,613    
Shares available for issuance (in shares) 1,549,776    
Common Stock | 2006 Plan
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares reserved for future issuance (in shares) 1,200,000    
Shares available for issuance (in shares) 409,045