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Stock-Based Compensation (Tables)

9 Months Ended

Sep. 27, 2014

Stock-Based Compensation [Abstract]

Schedule of Stock-Based Compensation Expense

The consolidated statements of operations for the three and nine months ended September 27, 2014 and September 28, 2013 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
			September 27, 2014			September 28, 2013			September 27, 2014			September 28, 2013
Cost of sales			$	633		$	630		$	2,061		$	1,955
Selling and administrative expenses				6,355			7,110			19,345			19,081
Research and development expenses				1,119			938			3,054			2,949
	Total stock-based compensation		$	8,107		$	8,678		$	24,460		$	23,985

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 September 27, 2014 and September 28, 2013 are as follows:

Options Issued and Significant Assumptions Used to Estimate Option Fair Values		September 27, 2014		September 28, 2013
Options issued in thousands		32		80
Risk-free interest rate		1.9%		1.0%
Expected life in years		4		3
Expected volatility		0.245		0.259
Expected dividends		-		-

Weighted-Average Exercise Price and Fair Value of Options on the Date of Grant		September 27, 2014			September 28, 2013
Exercise price		$	99.22		$	95.72
Fair value		$	22.38		$	26.22

Stock Options Outstanding Roll Forward

The following table summarizes stock option activity for the plans for the nine months ended September 27, 2014 (in thousands, except per share data):

				Number of Shares		Price per Share						Weighted-Average Exercise Price
Outstanding at December 31, 2013				3,917		$	33.12	to	$	103.47		$	71.08
	Granted			32			$	99.22				$	99.22
	Exercised			(654)		$	33.12	to	$	87.06		$	60.40
	Canceled			(21)		$	79.15	to	$	98.21		$	88.02
Outstanding at September 27, 2014				3,274		$	37.84	to	$	103.47		$	73.38

Restricted Stock Units Unvested Roll Forward

The following table summarizes the unvested restricted stock unit award activity for the nine months ended September 27, 2014 (in thousands, except for per share amounts):

			Shares		Weighted-Average Price
Unvested at December 31, 2013			642		$	82.16
	Granted		134		$	112.59
	Vested		(192)		$	66.38
	Forfeited		(16)		$	85.82
Unvested at September 27, 2014			568		$	94.57

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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.

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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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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.

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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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