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Net Income Per Share (Tables) | 12 Months Ended
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Dec. 31, 2014
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, 2014 |  | December 31, 2013 |  | December 31, 2012
| (In thousands, except per share data)
Net income | $ | 30,518 |  |  | $ | 23,979 |  |  | $ | 16,178 |
Weighted-average shares outstanding — basic | 35,650 |  |  | 34,736 |  |  | 33,307 |
Add: Dilutive effect of employee stock plans | 972 |  |  | 1,041 |  |  | 906 |
Weighted-average shares outstanding — diluted | 36,622 |  |  | 35,777 |  |  | 34,213 |
Net income per share — basic | $ | 0.86 |  |  | $ | 0.69 |  |  | $ | 0.49 |
Net income per share — diluted | $ | 0.83 |  |  | $ | 0.67 |  |  | $ | 0.47 |
Anti-dilutive weighted-average shares related to stock award plans | 640 |  |  | 850 |  |  | 2,149 |

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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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