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Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2016

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Number and Weighted Average Exercise Price of Options Issued and Outstanding under All Stock Option Plans

number and weighted-average exercise price of stock options issued and outstanding under all stock plans, is presented below (in thousands, except for exercise price):

	Year ended December 31, 2016							Year ended January 2, 2016							Year ended January 3, 2015
	Shares			Average Exercise Price				Shares			Average Exercise Price				Shares			Average Exercise Price
Options outstanding, beginning of period	9,202			$	25.46			9,956			$	23.59			8,911			$	22.76
Granted	1,290			39.94				914			36.18				1,887			24.83
Canceled	(172	)		29.13				(218	)		24.33				(416	)		24.46
Expired	—			—				—			—				—			—
Exercised	(1,799	)		20.76				(1,450	)		19.54				(426	)		10.95
Options outstanding, end of period	8,521			$	28.56			9,202			25.46				9,956			$	23.59
Options exercisable, end of period	4,988			$	26.33			5,609			$	24.72			5,859			$	23.63

Number and Weighted Average Exercise Price of Outstanding and Exercisable Options

The number and weighted-average exercise price of outstanding and exercisable stock options segregated by exercise price ranges (in thousands, except range of exercise prices and remaining contractual life) were as follows:

	Year ended December 31, 2016								Year ended January 2, 2016
	Options Outstanding					Options Exercisable			Options Outstanding					Options Exercisable
Range of Exercise Prices	Number of Options			Average Remaining Contractual Life		Number of Options			Number of Options			Average Remaining Contractual Life		Number of Options
$8.00 to $20.00	565			5.34		296			1,367			3.79		947
$20.01 to $30.00	4,297			5.31		2,940			5,196			6.17		3,006
$30.01 to $40.00	3,233			5.89		1,591			2,349			5.00		1,534
$40.01 to $50.00	311			6.14		161			290			6.81		122
$50.01 to $60.00	91			9.65		—			—					—
$60.01 to $70.00	24			9.90		—			—					—
Total	8,521			5.62		4,988			9,202			5.53		5,609

Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]

A summary of unvested RSU award activity is presented below (in thousands) except for per share amounts:

	Year ended December 31, 2016							Year ended January 2, 2016							Year ended January 3, 2015
	Units			Weighted Average Grant  Date Fair Value				Units			Weighted Average Grant  Date Fair Value				Units			Weighted Average Grant  Date Fair Value
RSUs outstanding, beginning of period	2,703			$	41.45			—			$	—			—			$	—
Granted	6			43.09				2,703			41.45				—			—
Canceled	—			—				—			—				—			—
Expired	—			—				—			—				—			—
Vested	(3	)		41.45				—			—				—			—
RSUs outstanding, end of period	2,706			$	41.45			2,703			$	41.45			—			$	—

Range of Assumptions Used and Resulting Weighted-Average Fair Value of Options Granted at Date of Grant

The range of assumptions used and the resulting weighted-average fair value of stock options granted at the date of grant were as follows:

	Year ended December 31, 2016		Year ended January 2, 2016		Year ended January 3, 2015
Risk-free interest rate	1.0% to 2.1%		1.3% to 1.9%		1.4% to 1.9%
Expected term	5.5 years to 5.7 years		5.5 years to 5.7 years		5.1 years to 5.5 years
Estimated volatility	29.8% to 35.7%		32.0% to 37.4%		31.7% to 36.5%
Expected dividends	0%		0%		0%
Weighted-average fair value of options granted	$13.64 per share		$12.20 per share		$7.85 per share

Total Share-Based Compensation Expense Included in Consolidated Statements of Comprehensive Income

The following table presents the total share-based compensation expense that is included in each functional line item of the consolidated statements of operations (in thousands):

	Year ended December 31, 2016				Year ended January 2, 2016				Year ended January 3, 2015
Cost of goods sold	$	355			$	348			$	436
Selling, general and administrative	9,443				8,139				8,812
Research and development	2,705				2,338				1,757
Total	$	12,503			$	10,825			$	11,005

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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 option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms.

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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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