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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2017
Equity [Abstract] |
Schedule of Restricted Stock Unit Activity | RSU activity for the year ended December 31, 2017 is presented below (in thousands, except per share data):
|  |  |  |  |  | Weighted- |
|  |  |  |  |  | Average |
|  | Number of |  |  | Grant Date |
|  | Shares |  |  | Fair Value |
Unvested at December 31, 2016 |  |  | 539 |  |  | $ | 35.50 |
Granted |  |  | 253 |  |  |  | 39.73 |
Vested |  |  | (212 | ) |  |  | 35.38 |
Forfeited |  |  | (71 | ) |  |  | 35.92 |
Unvested at December 31, 2017 |  |  | 509 |  |  | $ | 37.59 |
Schedule of Stock Option Activity | Stock option activity for the year ended December 31, 2017 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, 2016 |  |  | 1,540 |  |  | $ | 34.35 |  |  |  |  |  |  |  |  |
Granted |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Exercised |  |  | (512 | ) |  |  | 32.90 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (91 | ) |  |  | 34.87 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2017 |  |  | 937 |  |  | $ | 35.10 |  |  |  | 5.86 |  |  | $ | 8,529 |
Exercisable at December 31, 2017 |  |  | 650 |  |  | $ | 34.98 |  |  |  | 5.16 |  |  | $ | 5,992 |
Vested and expected to vest at December 31, 2017 |  |  | 937 |  |  | $ | 35.10 |  |  |  | 5.86 |  |  | $ | 8,529 |
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, 2017 |  | 24 |  |  | $ | 31.03 |
August 31, 2017 |  | 26 |  |  | $ | 31.71 |
February 29, 2016 |  | 28 |  |  | $ | 26.00 |
August 31, 2016 |  | 25 |  |  | $ | 27.04 |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock 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 + Details
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- Definition Tabular disclosure of employee stock purchase plan activity. + 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 (g) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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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://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 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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