| http://www.w3.org/ns/prov#value | - The following key weighted average assumptions were employed in the calculation for the three months ended March 31, 2014: Three Months Ended March 31, 2014Risk-free interest rate1.24%Expected dividend yield???%Volatility50.40%Expected life4.0 yearsWeighted average Black-Scholes value of options granted$11.01The risk-free interest rate is based on the U.S. Treasury yield curve in effect at the tim
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