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Net Income Per Share (Tables) | 6 Months Ended
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Jun. 30, 2015
Earnings Per Share [Abstract] |
Basic and Diluted Net Income Per Share | The calculation of basic and diluted net income per share is as follows:
| Three months ended June 30, | Six months ended June 30,
| 2015 |  | 2014 | 2015 |  | 2014
| (In thousands, except per share data)
Net income | $ | 8,751 |  |  | $ | 7,789 |  | $ | 15,069 |  |  | $ | 13,983 |
Weighted-average shares outstanding — basic | 36,120 |  |  | 35,661 |  | 36,072 |  |  | 35,451 |
Dilutive effect of employee stock plans | 910 |  |  | 957 |  | 915 |  |  | 1,027 |
Weighted-average shares outstanding — diluted | 37,030 |  |  | 36,618 |  | 36,987 |  |  | 36,478 |
Net income per share — basic | $ | 0.24 |  |  | $ | 0.22 |  | $ | 0.42 |  |  | $ | 0.39 |
Net income per share — diluted | $ | 0.24 |  |  | $ | 0.21 |  | $ | 0.41 |  |  | $ | 0.38 |
Anti-dilutive weighted-average shares related to stock award plans | 377 |  |  | 353 |  | 356 |  |  | 1,347 |

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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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