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Stock Options (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]      
Weighted average fair value of options granted (in dollars per share) $ 1.89 $ 2.32 $ 1.61
Risk-free interest rate 0.76%    
Expected life (years)   5 years  
Expected volatility factor 67.00% 69.00%  
Expected dividends       
Minimum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Risk-free interest rate   0.65% 0.90%
Expected life (years) 5 years   5 years
Expected volatility factor     68.00%
Maximum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Risk-free interest rate   0.74% 2.80%
Expected life (years) 7 years   8 years
Expected volatility factor     74.00%