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Basis of Presentation and Significant Accounting Policies (Property and Equipment) (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Aug. 31, 2017
Sep. 29, 2018
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Dec. 30, 2017
Property, Plant and Equipment [Line Items]            
Proceeds from sale of building       $ 0 $ 7,895  
Property and equipment, less accumulated depreciation of $139,310 at September 29, 2018 and $131,260 at December 30, 2017   $ 35,724   35,724   $ 40,423
Accumulated depreciation   139,310   139,310   $ 131,260
Gain on sale of building   $ 0 $ 4,624 $ 0 $ 4,624  
Equipment | Minimum            
Property, Plant and Equipment [Line Items]            
Property, plant and equipment, useful life       3 years    
Equipment | Maximum            
Property, Plant and Equipment [Line Items]            
Property, plant and equipment, useful life       5 years    
Software Development | Minimum            
Property, Plant and Equipment [Line Items]            
Property, plant and equipment, useful life       3 years    
Software Development | Maximum            
Property, Plant and Equipment [Line Items]            
Property, plant and equipment, useful life       5 years    
Tooling | Minimum            
Property, Plant and Equipment [Line Items]            
Property, plant and equipment, useful life       1 year    
Tooling | Maximum            
Property, Plant and Equipment [Line Items]            
Property, plant and equipment, useful life       3 years    
Building            
Property, Plant and Equipment [Line Items]            
Property, plant and equipment, useful life       30 years    
Building | Shanghai, China            
Property, Plant and Equipment [Line Items]            
Proceeds from sale of building $ 7,900          
Property and equipment, less accumulated depreciation of $139,310 at September 29, 2018 and $131,260 at December 30, 2017 3,600          
Accumulated depreciation 1,400          
Disposition of property, direct selling costs 1,100          
Gain on sale of building $ (4,600)