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Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jul. 01, 2017

Accounting Policies [Abstract]

Property, Plant and Equipment

Property and equipment are stated at cost. Depreciation is calculated using the straight-line method over estimated useful lives as follows:

	Useful Lives
Buildings	39 years
Building improvements	7 to 15 years
Leasehold improvements	Lesser of useful life or term of lease
Machinery and equipment	5 to 7 years
Vehicles	5 years
Tooling	3 years
Computer equipment	2 to 6 years
Furniture and office equipment	2 to 6 years
Demonstration units	3 years

Property and equipment, net, consists of the following (in thousands):

	July 1, 2017				December 31, 2016
Building and building improvements	$	86,015			$	85,966
Machinery and equipment	43,737				41,683
Land	23,762				23,762
Leasehold improvements	14,908				8,289
Computer equipment	14,199				13,549
Tooling	13,485				12,895
Furniture and office equipment	10,719				9,669
Demonstration units	467				448
Vehicles	45				45
Construction-in-progress	5,654				7,923
Total property and equipment	212,991				204,229
Accumulated depreciation and amortization	(75,268		)		(68,233		)
Property and equipment, net	$	137,723			$	135,996

Fair Value Hierarchy for Financial Assets

Changes in Product Warranty Accrual

Changes in the product warranty accrual were as follows (in thousands):

	Six Months Ended
	July 1, 2017				July 2, 2016
Warranty accrual, beginning of period	$	910			$	1,222
Accrual for warranties issued	606				521
Changes to pre-existing warranties (including changes in estimates)	(5		)		(40		)
Settlements made	(485		)		(488		)
Warranty accrual, end of period	$	1,026			$	1,215

Schedule of Change in Accumulated Other Comprehensive Income

The change in accumulated other comprehensive loss was as follows (in thousands):

	Six Months Ended   July 1, 2017
Accumulated other comprehensive loss, beginning of period	$	(7,027	)
Foreign currency translation adjustments	2,866
Accumulated other comprehensive loss, end of period	$	(4,161	)

Reconciliation of Basic and Diluted Net Income Per Share

reconciliation of basic and diluted net income per share is as follows (in thousands, except per share amounts):

	Three Months Ended								Six Months Ended
	July 1, 2017				July 2, 2016				July 1, 2017				July 2, 2016
Net income	$	46,680			$	30,023			$	92,014			$	57,600
Basic net income per share:
Weighted-average shares outstanding - basic	51,677				49,256				51,164				49,340
Net income per basic share	$	0.90			$	0.61			$	1.80			$	1.17
Diluted net income per share:
Weighted-average shares outstanding - basic	51,677				49,256				51,164				49,340
Diluted share equivalent: stock options and RSUs	4,496				3,447				4,703				3,064
Weighted-average shares outstanding - diluted	56,173				52,703				55,867				52,404
Net income per diluted share	$	0.83			$	0.57			$	1.65			$	1.10

Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]

Supplemental cash flow information includes the following (in thousands):

	Six Months Ended
	July 1, 2017				July 2, 2016
Cash paid during the year for:
Interest (net of amounts capitalized)	$	321			$	2,603
Income taxes	81,662				19,292
Noncash investing and financing activities:
Unpaid purchases of property, plant and equipment	$	2,113			$	1,168
Unsettled common stock proceeds from option exercises	237				187

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