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Stock-Based Compensation (Narrative) (Details)
$ in Thousands
3 Months Ended
Mar. 30, 2019
USD ($)
Period
Mar. 31, 2018
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation $ 3,686 $ 4,800
President And Chief Executive Officer [Member] | Performance Shares    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period 3 years  
Award vesting rights, number of consecutive trailing four-quarter periods for measurement | Period 2  
Corporate Vice President Of Research And Development [Member] | Performance Shares    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period 3 years  
Executives    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation $ 900 $ 300
TSR relative to PHLX Semiconductor Sector Index 50th percentile achievement | President And Chief Executive Officer [Member] | Performance Shares    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting rights, percentage 100.00%  
TSR relative to PHLX Semiconductor Sector Index 50th percentile achievement | Corporate Vice President Of Research And Development [Member] | Performance Shares    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting rights, percentage 100.00%  
TSR relative to PHLX Semiconductor Sector Index 75th percentile achievement | President And Chief Executive Officer [Member] | Performance Shares    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting multiplier 250.00%  
TSR relative to PHLX Semiconductor Sector Index 75th percentile achievement | Corporate Vice President Of Research And Development [Member] | Performance Shares    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting multiplier 200.00%  
TSR below 25th percentile | President And Chief Executive Officer [Member] | Performance Shares    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting rights, percentage 0.00%