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Property and Equipment Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019	Dec. 28, 2019
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 386,242		$ 386,242		$ 332,654
Accumulated depreciation	(123,289)		(123,289)		(113,102)
Property and equipment, net	262,953		262,953		219,552
Depreciation	5,300	$ 5,100	10,200	$ 9,400
Building and building improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	125,218		125,218		101,731
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	64,396		64,396		58,864
Land
Property, Plant and Equipment [Line Items]
Total property and equipment	50,535		50,535		40,216
Aircraft and vehicles
Property, Plant and Equipment [Line Items]
Total property and equipment	32,231		32,231		29,934
Computer equipment and software
Property, Plant and Equipment [Line Items]
Total property and equipment	22,800		22,800		19,650
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	17,488		17,488		15,921
Tooling
Property, Plant and Equipment [Line Items]
Total property and equipment	16,708		16,708		15,346
Furniture and office equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	13,021		13,021		11,049
Demonstration units
Property, Plant and Equipment [Line Items]
Total property and equipment	834		834		836
Construction-in-progress (CIP)
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 43,011		$ 43,011		$ 39,107

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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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