Stock-Based Compensation (Tables)

6 Months Ended

Jun. 29, 2013

Share-based Compensation [Abstract]

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs

Stock-based compensation expense recognized under ASC Topic 718, Compensation – Stock Compensation (“ASC 718”), for employees and directors and the effect on our Condensed Consolidated Statements of Operations were as follows:

	Three Months Ended				Six Months Ended
(In thousands)	June 29, 2013		June 30, 2012		June 29, 2013		June 30, 2012
Cost of sales	$	178	$	147	$	352	$	251
Research, development, and engineering	584		417		1,126		739
Selling, general and administrative expenses	2,656		2,305		5,201		4,035
Total stock-based compensation expense	$	3,418	$	2,869	$	6,679	$	5,025

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

We used the following weighted-average assumptions to estimate the fair value of our stock options granted during the three and six month periods ended June 29, 2013 and June 30, 2012:

	Three Months Ended		Six Months Ended
	June 29, 2013	June 30, 2012	June 29, 2013	June 30, 2012
Expected life (in years)	5.8	8.0	5.9	7.5
Risk-free interest rate	0.7%	1.7%	0.8%	1.4%
Volatility	47%	49%	47%	48%
Dividend yield	—	—	—	—