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Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2017

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

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

	Nine Months Ended   September 30, 2017
	Shares			Average Exercise Price
Options outstanding, beginning of period	8,521			$	28.56
Granted	847			86.80
Canceled	(220	)		36.49
Exercised	(2,009	)		27.66
Options outstanding, end of period	7,139			$	35.48
Options exercisable, end of period	3,991			$	26.26

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 equity plans are as follows (in thousands, except for grant date fair value amounts):

	Nine Months Ended   September 30, 2017
	Units			Weighted Average Grant  Date Fair Value
RSUs outstanding, beginning of period	2,706			$	41.45
Granted	33			86.42
Canceled	(25	)		85.79
Expired	—			—
Vested	(6	)		43.09
RSUs outstanding, end of period	2,708			$	41.59

Schedule of Nonvested Performance-based Units Activity [Table Text Block]

The number of PSUs outstanding under all of the Company’s equity plans are as follows (in thousands, except for grant date fair value amounts):

	Nine Months Ended   September 30, 2017
	Units			Weighted Average Grant  Date Fair Value
PSUs outstanding, beginning of period	—			$	—
Granted	248			90.71
Canceled	(15	)		90.87
Expired	—			—
Vested	—			—
PSUs outstanding, end of period	233			$	90.70

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
	September 30, 2017		October 1, 2016		September 30, 2017		October 1, 2016
Risk-free interest rate	1.7% to 2.0%		1.0% to 1.3%		1.7% to 2.2%		1.0% to 1.9%
Expected term (in years)	5.5		5.7		5.5		5.7
Estimated volatility	30.3% to 32.1%		30.3% to 31.9%		29.7% to 32.1%		30.3% to 35.7%
Expected dividends	0%		0%		0%		0%
Weighted-average fair value of options granted	$27.70		$17.99		$27.74		$13.42

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Tabular disclosure of the changes in outstanding nonvested performance-based units.

+ 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 (c)(2)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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.

+ 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 (c)(1)
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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

+ 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 (d)
-URI http://asc.fasb.org/extlink&oid=96867065&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 2
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Section 50
-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.

+ 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 (f)(2)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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