Stock-Based Compensation (Tables)

9 Months Ended

Oct. 01, 2016

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

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

The number of RSUs issued and outstanding under all of the Company’s stock option plans are as follows (in thousands, except for grant date fair value amounts):



	Nine Months Ended October 1, 2016
	Units	Weighted Average Grant Date Fair Value
RSUs outstanding, beginning of period	2,703	$	41.45
Granted	6	43.09
Canceled	—	—
Expired	—	—
Vested	—	—
RSUs outstanding, end of period	2,709	$	41.45

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

The number and weighted-average exercise price of options issued and outstanding under all of the Company’s stock option plans are as follows (in thousands, except for exercise prices):



	Nine Months Ended October 1, 2016
	Shares		Average Exercise Price
Options outstanding, beginning of period	9,202		$	25.46
Granted	1,257		39.34
Canceled	(141	)	29.32
Exercised	(1,292	)	20.43
Options outstanding, end of period	9,026		$	28.05
Options exercisable, end of period	5,222		$	26.01

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 options granted at the date of grant were as follows:



	Three Months Ended		Nine Months Ended
	October 1, 2016	October 3, 2015	October 1, 2016	October 3, 2015
Risk-free interest rate	1.0% to 1.3%	1.5% to 1.8%	1.0% to 1.9%	1.3% to 1.9%
Expected term (in years)	5.7	5.5	5.7	5.5
Estimated volatility	30.3% to 31.9%	32.3% to 35.6%	30.3% to 35.7%	32.0% to 37.4%
Expected dividends	0%	0%	0%	0%
Weighted-average fair value of options granted	$17.99	$14.09	$13.42	$11.82