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Net Income Per Share (Tables) | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Calculation of Basic and Diluted Net Income Per Share | The basic and diluted net income per share calculations for the years ended December 31, 2020, 2019, and 2018 were as follows:
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
| (In thousands, except per share data)
Net income | $ | 32,194 |  |  | $ | 61,338 |  |  | $ | 37,729 |
Weighted-average shares outstanding - basic | 42,583 |  |  | 41,462 |  |  | 39,242 |
Effect of dilutive securities from stock award plans | 1,160 |  |  | 1,481 |  |  | 1,317 |
Effect of convertible senior notes and warrants | — |  |  | — |  |  | — |
Weighted-average shares outstanding - diluted | 43,743 |  |  | 42,943 |  |  | 40,559 |
Net income per share - basic | $ | 0.76 |  |  | $ | 1.48 |  |  | $ | 0.96 |
Net income per share - diluted | $ | 0.74 |  |  | $ | 1.43 |  |  | $ | 0.93 |
Anti-dilutive weighted-average shares related to stock award plans | 2,054 |  |  | 926 |  |  | 1,279 |
Anti-dilutive weighted-average shares related to convertible senior notes and warrants | 11,816 |  |  | — |  |  | — |

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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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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