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Net Income Per Share (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Basic and Diluted Net Income Per Share | The calculation of basic and diluted net income per share is as follows:
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
| (In thousands, except per share data)
Net income | $ | 20,605 |  |  | $ | 603 |  |  | $ | 30,760 |
Weighted-average shares outstanding — basic | 37,483 |  |  | 36,156 |  |  | 35,857 |
Add: Dilutive effect of employee stock plans | 1,229 |  |  | 708 |  |  | 861 |
Weighted-average shares outstanding — diluted | 38,712 |  |  | 36,864 |  |  | 36,718 |
Net income per share — basic | $ | 0.55 |  |  | $ | 0.02 |  |  | $ | 0.86 |
Net income per share — diluted | $ | 0.53 |  |  | $ | 0.02 |  |  | $ | 0.84 |
Anti-dilutive weighted-average shares related to stock award plans | 501 |  |  | 1,345 |  |  | 555 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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