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Stock Plans (Tables) | 12 Months Ended
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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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- 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 + Details
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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 + Details
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