We use the Black-Scholes option pricing model to estimate the fair value of stock option awards on the date of grant utilizing the assumptions noted in the following table. We expense the cost of stock option awards on a straight-line basis over the vesting period. Expected volatilities are based on the historical volatility of our stock and other factors. We use historical data to estimate option exercises and employee terminations within the valuation model. The expected term of options represents the period of time that options granted are expected to be outstanding. The risk-free rate for periods during the contractual life of the option is based on the U.S. Treasury rates in effect at the grant date.

	Years Ended December 31,
	2013			2012			2011
Dividend yield		0			0	%		0	%
Expected volatility		65	%		65	%		100	%
Risk–free interest rate		0.3% - 1.0	%		0.3% - 0.8	%		0.6% - 1.8	%
Expected term (in years)		3.0			3.0			4.0
Weighted–average grant date fair value	$	1.99		$	3.51		$	3.37

Tabular disclosure of the fair value of stock awards, including but not limited to, stock options, restricted stock awards.

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