Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2013

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	Six Months Ended
	June 30, 2013	June 30, 2012
Risk-free interest rate	0.33%	0.31%
Expected life (in years)	3.5	3.5
Expected volatility	49.80%	57.62%
Dividend yield	—%	—%