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Stock Plans (Tables)

12 Months Ended

Dec. 31, 2018

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

Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity

The following table provides information about the Company’s ESPP activity during 2018, 2017, and 2016:

Employee Stock Purchase Plan
									(a)
		Total number							Weighted-average
		of shares			Average				fair value of each
		purchased			price paid				purchase right
Period		(in thousands)			per share				under the ESPP
As of December 31, 2016		622			$	36.57			$	4.06
As of December 31, 2017		544			$	50.13			$	5.57
As of December 31, 2018		661			$	50.73			$	5.64

(a) The weighted-average fair value of each purchase right under the ESPP granted is equal to ten percent discount from the market value of the Common Stock at the end of each monthly purchase period.

Schedule of Share-based Compensation, Restricted Stock Units Award Activity

Aggregated information regarding the Company’s RSUs and PBRSUs is summarized below:

		All Restricted Stock Units
		Units (000)			Wtd. Average Fair Value (per share)
Outstanding December 31, 2015		1,485			$	30.17
Granted		675		(a)	37.29
Vested		(665	)		23.29
Surrendered		(56	)		36.29
Outstanding December 31, 2016		1,439			36.52
Granted		717		(b)	52.73
Vested		(806	)		30.23
Surrendered		(56	)		43.86
Outstanding December 31, 2017, Unvested		1,294			45.32
Granted		782		(c)	60.80
Vested		(670	)		45.11
Surrendered		(64	)		47.05
Outstanding December 31, 2018, Unvested		1,342			52.56

(a) Includes 247 thousand PBRSUs

(b) Includes 235 thousand PBRSUs

(c) Includes 308 thousand PBRSUs

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- References

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- Definition

Tabular disclosure of employee stock purchase plan activity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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