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Property and Equipment Property and Equipment (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 30, 2017
Property, Plant and Equipment [Line Items]    
Total property and equipment $ 254,013 $ 246,333
Accumulated depreciation and amortization (89,986) (82,237)
Property and equipment, net 164,027 164,096
Building and building improvements    
Property, Plant and Equipment [Line Items]    
Total property and equipment 88,234 87,999
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Total property and equipment 51,471 47,556
Aircraft and vehicles    
Property, Plant and Equipment [Line Items]    
Total property and equipment 25,555 25,329
Land    
Property, Plant and Equipment [Line Items]    
Total property and equipment 23,762 23,762
Computer equipment    
Property, Plant and Equipment [Line Items]    
Total property and equipment 16,227 15,789
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Total property and equipment 16,141 15,326
Tooling    
Property, Plant and Equipment [Line Items]    
Total property and equipment 13,976 13,754
Furniture and office equipment    
Property, Plant and Equipment [Line Items]    
Total property and equipment 10,397 9,967
Demonstration units    
Property, Plant and Equipment [Line Items]    
Total property and equipment 479 486
Construction-in-progress (CIP)    
Property, Plant and Equipment [Line Items]    
Total property and equipment $ 7,771 $ 6,365