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Equity Incentive Plan (Tables)
6 Months Ended
Jun. 30, 2013
Assumptions Used to Estimate Fair Value of Stock Options and Stock Appreciation Rights Awards
The fair value of each stock option award during the three and six months ended June 30, 2013 and the six months ended June 30, 2012 was estimated on the grant date using the Black-Scholes option-pricing model with the following assumptions:
 
 
Three Months Ended
 
June 30,
 
2013
 
2012
Risk free interest rate
0.65%
 
-
Expected volatility
57.60%
 
-
Expected lives (years)
4
 
-
Expected dividend yield
0.00%
 
-
       
 
Six Months Ended
 
June 30,
 
2013
 
2012
Risk free interest rate
0.61% - 0.70%
 
0.64%
Expected volatility
57.60%
 
57.60%
Expected lives (years)
4
 
4
Expected dividend yield
0.00%
 
0.00%