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Stock-Based Compensation (Included in Statement of Operations) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 28, 2015
Mar. 29, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock-based compensation $ 2,909us-gaap_AllocatedShareBasedCompensationExpense $ 2,570us-gaap_AllocatedShareBasedCompensationExpense
Tax effect of stock-based compensation 0us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 0us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Total stock-based compensation, net of tax 2,909us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax 2,570us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
Cost of revenues    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock-based compensation 583us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember		 494us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
Research and development    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock-based compensation 845us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember		 624us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
Selling, general and administrative    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock-based compensation $ 1,481us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember		 $ 1,452us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember