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Equity Incentive Plan (Tables)
6 Months Ended
Jun. 30, 2012
Assumptions Used to Estimate Fair Value of Stock Options and Stock Appreciation Rights Awards
The fair value of each stock option award during the six months ended June 30, 2012 and the three and six months ended June 30, 2011 was estimated on the grant date using the Black-Scholes option-pricing model with the following assumptions:
 
   
Three Months Ended
 
   
June 30,
 
   
2012
   
2011
 
Risk free interest rate
    N/A       1.19 %
Expected volatility
    N/A       57.60 %
Expected lives (years)
    N/A       4  
Expected dividend yield
    N/A       0.00 %
                 
   
Six Months Ended
 
   
June 30,
 
      2012       2011  
Risk free interest rate
    0.64 %     1.19% - 1.51 %
Expected volatility
    57.60 %     57.60 %
Expected lives (years)
    4       4  
Expected dividend yield
    0.00 %     0.00 %