Share-based Compensation (Tables)

3 Months Ended

Mar. 31, 2013

Share-based Compensation

Assumptions used to estimate the fair value of stock options as of the date of grant

	Three Months Ended
	March 31,
	2013			2012
Number of options granted	—			40,000
Grant date fair value of options granted per share	$	—		$	8.16
Weighted average exercise price of options granted	$	—		$	14.27
Volatility (1)	—		%	61		%
Risk free interest rate (2)	—		%	1.4		%
Expected term (in years) (3)	—			6.3
Expected annual dividends	None			None

(1) Expected volatility is based on the historical volatility of our common stock over a preceding period commensurate with the expected term of the award.

(2) The risk free rate is based on the U.S. Treasury yield curve at the time of grant for periods consistent with the expected term of the option.

(3) We use historical data to estimate the expected term of the awards.