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Property and Equipment Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017	Dec. 30, 2017
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 258,292		$ 258,292		$ 246,333
Accumulated depreciation and amortization	(93,687)		(93,687)		(82,237)
Property and equipment, net	164,605		164,605		164,096
Depreciation	4,000	$ 3,800	12,100	$ 10,800
Building and building improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	88,403		88,403		87,999
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	53,160		53,160		47,556
Aircraft and vehicles
Property, Plant and Equipment [Line Items]
Total property and equipment	25,554		25,554		25,329
Land
Property, Plant and Equipment [Line Items]
Total property and equipment	23,762		23,762		23,762
Computer equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	16,426		16,426		15,789
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	16,323		16,323		15,326
Tooling
Property, Plant and Equipment [Line Items]
Total property and equipment	14,124		14,124		13,754
Furniture and office equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	10,371		10,371		9,967
Demonstration units
Property, Plant and Equipment [Line Items]
Total property and equipment	471		471		486
Construction-in-progress (CIP)
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 9,698		$ 9,698		$ 6,365

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- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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