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Summary of Significant Accounting Policies (Tables)

3 Months Ended

Apr. 01, 2017

Accounting Policies [Abstract]

Fair Value Hierarchy for Financial Assets

December 31, 2016	Adjusted Basis Cost				Gross Unrealized Gains				Gross Unrealized (Losses)				Estimated Fair Value				Cash and Cash Equivalents
Cash	$	305,970			$	—			$	—			$	305,970			$	305,970
Level 1:
None	—				—				—				—				—
Level 2:
None	—				—				—				—				—
Level 3:
None	—				—				—				—				—
Total assets measured at fair value	$	305,970			$	—			$	—			$	305,970			$	305,970

The following tables represent the Company’s financial assets (in thousands), measured at fair value on a recurring basis:

April 1, 2017	Adjusted Basis Cost				Gross Unrealized Gains				Gross Unrealized (Losses)				Estimated Fair Value				Cash and Cash Equivalents
Cash	$	343,825			$	—			$	—			$	343,825			$	343,825
Level 1:
None	—				—				—				—				—
Level 2:
None	—				—				—				—				—
Level 3:
None	—				—				—				—				—
Total assets measured at fair value	$	343,825			$	—			$	—			$	343,825			$	343,825

December 31, 2016	Adjusted Basis Cost				Gross Unrealized Gains				Gross Unrealized (Losses)				Estimated Fair Value				Cash and Cash Equivalents
Cash	$	305,970			$	—			$	—			$	305,970			$	305,970
Level 1:
None	—				—				—				—				—
Level 2:
None	—				—				—				—				—
Level 3:
None	—				—				—				—				—
Total assets measured at fair value	$	305,970			$	—			$	—			$	305,970			$	305,970

Changes in Product Warranty Accrual

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

	Three Months Ended
	April 1, 2017				April 2, 2016
Warranty accrual, beginning of period	$	910			$	1,222
Accrual for warranties issued	334				405
Changes to pre-existing warranties (including changes in estimates)	61				(50		)
Settlements made	(320		)		(290		)
Warranty accrual, end of period	$	985			$	1,287

Schedule of Change in Accumulated Other Comprehensive Income

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

	Three Months Ended   April 1, 2017
Accumulated other comprehensive loss, beginning of period	$	(7,027	)
Foreign currency translation adjustments	566
Accumulated other comprehensive loss, end of period	$	(6,461	)

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
		April 1, 2017				April 2, 2016
Net income		$	45,334			$	27,577
Basic net income per share:
Weighted-average shares outstanding - basic		50,652				49,424
Net income per basic share		$	0.90			$	0.56
Diluted net income per share:
Weighted-average shares outstanding - basic		50,652				49,424
Diluted share equivalent: stock options and RSUs		4,877				2,525
Weighted-average shares outstanding - diluted		55,529				51,949
Net income per diluted share		$	0.82			$	0.53

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

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

	Three Months Ended
	April 1, 2017				April 2, 2016
Cash paid during the year for:
Interest (net of amounts capitalized)	$	213			$	1,335
Income taxes	3,157				2,303
Noncash investing and financing activities:
Unpaid purchases of property, plant and equipment	$	1,203			$	3,600
Unsettled common stock proceeds from option exercises	2,560				896

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Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances.

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