Equity Incentive Plan (Tables)

3 Months Ended

Mar. 31, 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 months ended March 31, 2013 and 2012 was estimated on the grant date using the Black-Scholes option-pricing model with the following assumptions:

	Three Months Ended March 31,
	2013	2012
Risk free interest rate	0.70%	0.64%
Expected volatility	57.60%	57.60%
Expected lives (years)	4	4
Expected dividend yield	0.00%	0.00%