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Property and Equipment Property and Equipment (Details) - USD ($) $ in Thousands	Apr. 01, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 207,827	$ 204,229
Accumulated depreciation and amortization	(71,672)	(68,233)
Property and equipment, net	136,155	135,996
Building and Building Improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	85,992	85,966
Machinery and Equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	42,246	41,683
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	23,762	23,762
Computer equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	14,001	13,549
Tooling
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	13,099	12,895
Furniture and office equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	10,472	9,669
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	12,931	8,289
Demonstration units
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	450	448
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	45	45
Construction-in-progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 4,829	$ 7,923

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
-Topic 360
-SubTopic 10
-Section 50
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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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