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Property and Equipment Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018	Dec. 29, 2018
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 269,370		$ 263,762
Accumulated depreciation and amortization	(102,082)		(97,790)
Property and equipment, net	167,288		165,972
Depreciation	4,300	$ 4,000
Building and building improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	90,974		88,449
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	57,001		54,525
Aircraft and vehicles
Property, Plant and Equipment [Line Items]
Total property and equipment	25,555		25,555
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	18,334		16,582
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	16,896		16,428
Tooling
Property, Plant and Equipment [Line Items]
Total property and equipment	14,465		14,212
Furniture and office equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	10,558		10,459
Demonstration units
Property, Plant and Equipment [Line Items]
Total property and equipment	465		470
Construction-in-progress (CIP)
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 11,360		$ 13,320

X

- 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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