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Stock-Based Compensation (Tables)

6 Months Ended

Jul. 02, 2016

Stock-Based Compensation [Abstract]

Schedule of Stock-Based Compensation Expense

The consolidated statements of operations for the three and six months ended July 2, 2016 and July 4, 2015 include the following stock-based compensation expense related to stock option awards, restricted stock, restricted stock unit awards and the employee stock purchase plan (in thousands):

			Three Months Ended						Six Months Ended
			July 2, 2016			July 4, 2015			July 2, 2016			July 4, 2015
Cost of sales			$	656		$	648		$	1,327		$	1,322
Selling and administrative expenses				6,613			6,426			20,582			13,060
Research and development expenses				1,127			1,081			2,328			2,228
	Total stock-based compensation		$	8,396		$	8,155		$	24,237		$	16,610

Relevant Data Used to Determine the Value of Stock Options Granted During the Period

The relevant data used to determine the value of the stock options granted during the six months ended July 2, 2016 and July 4, 2015 are as follows:

		Six Months Ended
Options Issued and Significant Assumptions Used to Estimate Option Fair Values		July 2, 2016		July 4, 2015
Options issued (in thousands)		86		37
Risk-free interest rate		1.5%		1.7%
Expected life in years		5		4
Expected volatility		0.286		0.262
Expected dividends		-		-

		Six Months Ended
Weighted-Average Exercise Price and Fair Value of Options on the Date of Grant		July 2, 2016			July 4, 2015
Exercise price		$	122.65		$	116.65
Fair value		$	34.63		$	28.17

Stock Options Outstanding Roll Forward

The following table summarizes stock option activity for the plans for the six months ended July 2, 2016 (in thousands, except per share data):

				Number of Shares		Price per Share						Weighted-Average Exercise Price
Outstanding at December 31, 2015				3,154		$	38.09	to	$	134.37		$	96.73
	Granted			86		$	117.68	to	$	130.35		$	122.65
	Exercised			(252)		$	41.20	to	$	113.36		$	79.21
	Canceled			(50)		$	79.15	to	$	128.93		$	109.16
Outstanding at July 2, 2016				2,938		$	38.09	to	$	134.37		$	98.78

Restricted Stock Units Unvested Roll Forward

The following table summarizes the unvested restricted stock unit award activity for the six months ended July 2, 2016 (in thousands, except for per share data):

			Shares		Weighted-Average Price
Unvested at December 31, 2015			497		$	104.16
	Granted		136		$	117.75
	Vested		(135)		$	97.57
	Forfeited		(9)		$	112.25
Unvested at July 2, 2016			489		$	109.61

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Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 14.F)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14
-Section F

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Tabular disclosure of the changes in outstanding nonvested restricted stock units.

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Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 2
-Subparagraph (c)(1)
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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Section 50
-Paragraph 2
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