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Property, Plant and Equipment, net (Property, Plant and Equipment) (Details) - USD ($)
$ in Thousands
Jun. 29, 2018
Dec. 29, 2017
Property, Plant and Equipment [Line Items]    
Property, plant and equipment gross $ 76,573 $ 71,253
Less: accumulated depreciation and amortization (28,180) (27,617)
Property, plant and equipment, net 48,393 43,636
Machinery and manufacturing equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment gross 34,233 33,664
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment gross 11,432 9,919
Internal-use computer software    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment gross 11,153 7,819
Building and land    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment gross 8,811 8,811
Information systems, office equipment and furniture    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment gross 7,197 7,715
Transportation equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment gross $ 3,747 $ 3,325