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Property and Equipment Property and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 30, 2017
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 250,213	$ 246,333
Accumulated depreciation and amortization	(85,977)	(82,237)
Property and equipment, net	164,236	164,096
Building and building improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	88,215	87,999
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	49,842	47,556
Aircraft and vehicles
Property, Plant and Equipment [Line Items]
Total property and equipment	25,329
Aircraft and vehicles
Property, Plant and Equipment [Line Items]
Total property and equipment		25,329
Land
Property, Plant and Equipment [Line Items]
Total property and equipment	23,762	23,762
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	15,649	15,326
Computer equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	15,785	15,789
Tooling
Property, Plant and Equipment [Line Items]
Total property and equipment	13,818	13,754
Furniture and office equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	10,328	9,967
Demonstration units
Property, Plant and Equipment [Line Items]
Total property and equipment	491	486
Construction-in-progress (CIP)
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 6,994	$ 6,365

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

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.

+ References

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+ References

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