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Property and Equipment Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018	Dec. 29, 2018
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 319,987		$ 319,987		$ 263,762
Accumulated depreciation	(110,529)		(110,529)		(97,790)
Property and equipment, net	209,458		209,458		165,972
Depreciation	4,800	$ 4,000	14,300	$ 12,100
Building and building improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	91,704		91,704		88,449
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	58,582		58,582		54,525
Land
Property, Plant and Equipment [Line Items]
Total property and equipment	40,216		40,216		23,762
Aircraft and vehicles
Property, Plant and Equipment [Line Items]
Total property and equipment	28,818		28,818		25,555
Computer equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	19,214		19,214		16,582
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	17,574		17,574		16,428
Tooling
Property, Plant and Equipment [Line Items]
Total property and equipment	15,070		15,070		14,212
Furniture and office equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	10,708		10,708		10,459
Demonstration units
Property, Plant and Equipment [Line Items]
Total property and equipment	792		792		470
Construction-in-progress (CIP)
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 37,309		$ 37,309		$ 13,320

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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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