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Stock-Based Compensation (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Stock-Based Compensation [Abstract]      
Share based compensation expense $ 914,000 $ 727,000 $ 807,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Unrecognized compensation expense 2,200,000    
Weighted average remaining service period 6 years 6 months    
Cash received from exercise of stock options 272,000 133,000 97,000
Aggregate intrinsic value of stock options exercised 94,000 103,000 159,000
Long Term Incentive Stock Option Plan 1995 [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Dividend yield (in hundredths) 0.00% 0.00% 0.00%
Weighted average volatility (in hundredths) 53.85% 55.04% 55.38%
Long Term Incentive Stock Option Plan 1995 [Member] | Installments One [Member]
     
Share-based Payment Award [Line Items]      
Number of Installments 3    
Long Term Incentive Stock Option Plan 1995 [Member] | Installments Two [Member]
     
Share-based Payment Award [Line Items]      
Number of Installments 5    
Long Term Incentive Stock Option Plan 1995 [Member] | Installments Three [Member]
     
Share-based Payment Award [Line Items]      
Number of Installments 7    
Long Term Incentive Stock Option Plan 1995 [Member] | Minimum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Risk free interest rate, minimum (in hundredths) 0.34% 1.06% 0.57%
Expected life 2 years 3 years 9 months 2 years 6 months
Volatility rate, minimum (in hundredths) 52.13% 49.49% 37.20%
Long Term Incentive Stock Option Plan 1995 [Member] | Maximum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Risk free interest rate, maximum (in hundredths) 1.16% 2.28% 2.93%
Expected life 6 years 3 months 11 days 6 years 11 months 23 days 6 years 6 months
Volatility rate, maximum (in hundredths) 57.85% 60.24% 63.80%
Long Term Incentive Stock Option Plan 1995 [Member] | Stock Options [Member]
     
Share-based Payment Award [Line Items]      
Life of plan (in years) 23Y    
Number of shares authorized (in shares) 5,500,000    
Stock options remaining to be granted (in shares) 836,883    
Share-based Payment Award, Options, Outstanding [Roll Forward]      
Shares under option and warrant, beginning balance (in shares) 3,479,450    
Options granted (in shares) 212,870 1,463,000  
Common stock issued for options exercised (in shares) (266,211)    
Options forfeited (in shares) (216,439)    
Warrants expired (in shares) (138,867)    
Shares under options and warrant, ending balance (in shares) 3,070,803 3,479,450  
Options expected to vest (in shares) 1,750,107    
Options and warrants exercisable, ending balance (in shares) 1,320,696    
Options, Outstanding, Weighted Average Exercise Price [Roll Forward]      
Weighted average exercise price, shares under option and warrant, beginning balance (in dollars per share) $ 3.46    
Weighted average exercise price, options granted (in dollars per share) $ 2.26    
Weighted average exercise price, options exercised (in dollars per share) $ 1.63    
Weighted average exercise price, options forfeited (in dollars per share) $ 3.73    
Weighted average exercise price, warrants expired (in dollars per share) $ 6.00    
Weighted average exercise price, shares under options and warrant, ending balance (in dollars per share) $ 3.40 $ 3.46  
Weighted average exercise price, options expected to vest (in dollars per share) $ 2.75    
Weighted average exercise price, options and warrants exercisable, beginning balance (in dollars per share) $ 4.27    
Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Aggregate intrinsic value, shares under option and warrant, beginning of period 534,000    
Aggregate intrinsic value, options expected to vest 358,000    
Aggregate intrinsic value, options and warrants exercisable, ending balance $ 176,000    
Weighted average remaining contractual life, shares under option and warrant, beginning of period 4 years 10 months 10 days    
Weighted average remaining contractual life, options expected to vest 5 years 5 months 5 days    
Weighted average remaining contractual life, options and warrants exercisable, end of period 4 years 29 days    
Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Nonvested options, beginning balance (in shares) 2,040,690    
Options granted (in shares) 212,870    
Options vested during the period (in shares) (503,453)    
Nonvested options, ending balance (in shares) 1,750,107 2,040,690  
Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Weighted average fair value at beginning of period (in dollars per share) $ 1.57    
Weighted average fair value, options granted (in dollars per share) $ 0.93    
Weighted average fair value, options vested during the period (in dollars per share) $ 1.76    
Weighted average fair value at end of period (in dollars per share) $ 1.57 $ 1.57