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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2018
Equity [Abstract] |
Schedule of Restricted Stock Unit Activity | RSU activity for the year ended December 31, 2018 is presented below (in thousands, except per share data):
|  |  |  |  |  | Weighted- |
|  |  |  |  |  | Average |
|  | Number of |  |  | Grant Date |
|  | Shares |  |  | Fair Value |
Unvested at December 31, 2017 |  |  | 509 |  |  | $ | 37.59 |
Granted |  |  | 261 |  |  |  | 43.71 |
Vested |  |  | (198 | ) |  |  | 37.12 |
Forfeited |  |  | (75 | ) |  |  | 38.31 |
Unvested at December 31, 2018 |  |  | 497 |  |  | $ | 40.89 |
Schedule of Stock Option Activity | Stock option activity for the year ended December 31, 2018 is presented below (in thousands, except per share data and contractual term):
|  |  |  |  |  | Weighted - |  |  | Weighted - |  |  |  |  |
|  |  |  |  |  | Average |  |  | Average |  |  |  |  |
|  |  |  |  |  | Exercise |  |  | Remaining |  |  | Aggregate |
|  | Number |  |  | Price Per |  |  | Contractual |  |  | Intrinsic |
|  | of Shares |  |  | Share |  |  | Term (in years) |  |  | Value |
Outstanding at December 31, 2017 |  |  | 937 |  |  | $ | 35.10 |  |  |  |  |  |  |  |  |
Granted |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Exercised |  |  | (319 | ) |  |  | 34.83 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (35 | ) |  |  | 34.78 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2018 |  |  | 583 |  |  | $ | 35.27 |  |  |  | 4.82 |  |  | $ | 5,496 |
Exercisable at December 31, 2018 |  |  | 488 |  |  | $ | 35.40 |  |  |  | 4.44 |  |  | $ | 4,545 |
Vested and expected to vest at December 31, 2018 |  |  | 583 |  |  | $ | 35.27 |  |  |  | 4.82 |  |  | $ | 5,496 |
Summary of Shares Purchased by Employees Under the Stock Purchase Plan | Shares purchased by employees under the Stock Purchase Plan are as follows (in thousands, except per share data):
| Shares |  |  | Purchase |
Purchase Period Ended | Purchased |  |  | Price |
February 28, 2018 |  | 27 |  |  | $ | 34.43 |
August 31, 2018 |  | 28 |  |  | $ | 34.21 |
February 28, 2017 |  | 24 |  |  | $ | 31.03 |
August 31, 2017 |  | 26 |  |  | $ | 31.71 |

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- Definition 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: 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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