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Equipment, Leasehold Improvements and Software (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 27, 2019
Dec. 28, 2018
Property, Plant and Equipment [Line Items]    
Equipment, leasehold improvements and software, gross $ 150,961 $ 136,776
Less: accumulated depreciation and amortization (60,430) (51,500)
Equipment, leasehold improvements and software, net 90,531 85,276
Land    
Property, Plant and Equipment [Line Items]    
Equipment, leasehold improvements and software, gross $ 1,170 1,170
Buildings    
Property, Plant and Equipment [Line Items]    
Useful Lives 20 years  
Equipment, leasehold improvements and software, gross $ 1,325 1,292
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Equipment, leasehold improvements and software, gross $ 20,651 17,837
Machinery and equipment | Minimum    
Property, Plant and Equipment [Line Items]    
Useful Lives 5 years  
Machinery and equipment | Maximum    
Property, Plant and Equipment [Line Items]    
Useful Lives 10 years  
Computers, data processing and other equipment    
Property, Plant and Equipment [Line Items]    
Equipment, leasehold improvements and software, gross $ 13,168 11,244
Computers, data processing and other equipment | Minimum    
Property, Plant and Equipment [Line Items]    
Useful Lives 3 years  
Computers, data processing and other equipment | Maximum    
Property, Plant and Equipment [Line Items]    
Useful Lives 7 years  
Software    
Property, Plant and Equipment [Line Items]    
Equipment, leasehold improvements and software, gross $ 29,345 22,779
Software | Minimum    
Property, Plant and Equipment [Line Items]    
Useful Lives 3 years  
Software | Maximum    
Property, Plant and Equipment [Line Items]    
Useful Lives 7 years  
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Equipment, leasehold improvements and software, gross $ 69,515 60,565
Leasehold improvements | Minimum    
Property, Plant and Equipment [Line Items]    
Useful Lives 1 year  
Leasehold improvements | Maximum    
Property, Plant and Equipment [Line Items]    
Useful Lives 40 years  
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Useful Lives 7 years  
Equipment, leasehold improvements and software, gross $ 3,337 3,268
Vehicles    
Property, Plant and Equipment [Line Items]    
Equipment, leasehold improvements and software, gross $ 4,041 2,769
Vehicles | Minimum    
Property, Plant and Equipment [Line Items]    
Useful Lives 5 years  
Vehicles | Maximum    
Property, Plant and Equipment [Line Items]    
Useful Lives 7 years  
Other    
Property, Plant and Equipment [Line Items]    
Useful Lives 7 years  
Equipment, leasehold improvements and software, gross $ 95 95
Construction-in-process    
Property, Plant and Equipment [Line Items]    
Equipment, leasehold improvements and software, gross $ 8,314 $ 15,757