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Property and Equipment Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018	Dec. 29, 2018
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 309,310		$ 309,310		$ 263,762
Accumulated depreciation and amortization	(106,500)		(106,500)		(97,790)
Property and equipment, net	202,810		202,810		165,972
Depreciation	5,100	$ 4,100	9,400	$ 8,100
Building and building improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	91,595		91,595		88,449
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	58,077		58,077		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	25,595		25,595		25,555
Computer equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	18,649		18,649		16,582
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	17,167		17,167		16,428
Tooling
Property, Plant and Equipment [Line Items]
Total property and equipment	14,742		14,742		14,212
Furniture and office equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	10,670		10,670		10,459
Demonstration units
Property, Plant and Equipment [Line Items]
Total property and equipment	474		474		470
Construction-in-progress (CIP)
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 32,125		$ 32,125		$ 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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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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