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Property and Equipment Property and Equipment (Details) $ in Thousands	1 Months Ended
	Jun. 30, 2015 USD ($) ft²	Jul. 04, 2015 USD ($)	Jan. 03, 2015 USD ($)
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Number of Square Feet Purchased | ft²	90,000
Property, Plant and Equipment, Additions	$ 8,500
Property, plant and equipment, gross		$ 182,153	$ 159,036
Accumulated depreciation and amortization		(59,430)	(57,084)
Property and equipment, net		122,723	101,952
Land, Buildings and Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Additions	$ 6,300
Computer equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		41,269	38,588
Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		44,469	30,678
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		23,549	22,894
Tooling
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		12,991	12,317
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		14,640	13,035
Furniture and office equipment
Property, Plant and Equipment [Line Items]
Capital Leased Assets, Gross		600	600
Property, plant and equipment, gross		7,155	4,864
Demonstration Units [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		980	972
Demonstration units
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		45	45
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		7,212	9,912
Construction-in-progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		29,843	25,731
Capital Lease Obligations [Member]
Property, Plant and Equipment [Line Items]
Accumulated depreciation and amortization		$ (500)	$ (400)

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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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