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Stock-Based Compensation (Tables)

9 Months Ended

Oct. 01, 2016

Stock-Based Compensation [Abstract]

Schedule of Stock-Based Compensation Expense

The consolidated statements of operations for the three and nine months ended October 1, 2016 and October 3, 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						Nine Months Ended
			October 1, 2016			October 3, 2015			October 1, 2016			October 3, 2015
Cost of sales			$	731		$	668		$	2,058		$	1,990
Selling and administrative expenses				6,944			6,626			27,526			19,686
Research and development expenses				692			1,053			3,020			3,281
	Total stock-based compensation		$	8,367		$	8,347		$	32,604		$	24,957

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 nine months ended October 1, 2016 and October 3, 2015 are as follows:

		Nine Months Ended
Options Issued and Significant Assumptions Used to Estimate Option Fair Values		October 1, 2016		October 3, 2015
Options issued (in thousands)		86		115
Risk-free interest rate		1.5%		1.4%
Expected life in years		5		4
Expected volatility		0.286		0.291
Expected dividends		-		-

		Nine Months Ended
Weighted-Average Exercise Price and Fair Value of Options on the Date of Grant		October 1, 2016			October 3, 2015
Exercise price		$	122.65		$	121.33
Fair value		$	34.63		$	30.85

Stock Options Outstanding Roll Forward

The following table summarizes stock option activity for the plans for the nine months ended October 1, 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			(700)		$	41.20	to	$	113.36		$	76.98
	Canceled			(50)		$	79.15	to	$	128.93		$	109.55
Outstanding at October 1, 2016				2,490		$	38.09	to	$	134.37		$	102.92

Restricted Stock Units Unvested Roll Forward

The following table summarizes the unvested restricted stock unit award activity for the nine months ended October 1, 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		(143)		$	98.76
	Forfeited		(11)		$	109.85
Unvested at October 1, 2016			479		$	109.50

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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

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-Name Accounting Standards Codification
-Topic 718
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-Paragraph 1
-Subparagraph (SAB Topic 14.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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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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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-Publisher FASB
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-Section 50
-Paragraph 2
-Subparagraph (f)(2)
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