Stock-Based Compensation Effect on Financial Statements (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jul. 02, 2011	Jun. 30, 2012	Jul. 02, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 2,869,000	$ 2,056,000	$ 5,025,000	$ 3,532,000
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount	100,000	100,000	100,000	100,000
Cost of Sales
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	147,000	80,000	251,000	201,000
Research, Development, and Engineering Expense
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	417,000	353,000	739,000	616,000
Selling, General and Administrative Expenses
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 2,305,000	$ 1,623,000	$ 4,035,000	$ 2,715,000