Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2015

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

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

The following table provides the weighted average assumptions used in determining the fair value of the non-market based SARs awards granted during the six-month periods endedJune 30, 2015 and June 30, 2014: 

	Six Months Ended
	June 30,
	2015	2014
Risk-free interest rate	1.02%	0.71%
Expected life	3.5 years	3.5 years
Expected volatility	54.47%	47.94%
Dividend yield	—%	—%