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Net Income (Loss) Per Share (Tables) | 9 Months Ended
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Sep. 30, 2018
Earnings Per Share [Abstract] |
Basic and Diluted Net Income Per Share | The basic and diluted net income (loss) per share calculation for the three and nine months ended September 30, 2018 and 2017 was as follows:
| Three months ended September 30, |  | Nine months ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
| (In thousands, except per share data)
Net income (loss) | $ | 13,628 |  |  | $ | 7,748 |  |  | $ | 22,936 |  |  | $ | (707 | )
Weighted-average shares outstanding — basic | 39,432 |  |  | 37,698 |  |  | 39,015 |  |  | 37,266 |
Effect of dilutive securities from stock award plans | 1,428 |  |  | 1,275 |  |  | 1,222 |  |  | — |
Weighted-average shares outstanding — diluted | $ | 40,860 |  |  | $ | 38,973 |  |  | 40,237 |  |  | 37,266 |
Net income (loss) per share - basic | $ | 0.35 |  |  | $ | 0.21 |  |  | $ | 0.59 |  |  | $ | (0.02 | )
Net income (loss) per share - diluted | $ | 0.33 |  |  | $ | 0.20 |  |  | $ | 0.57 |  |  | $ | (0.02 | )
Anti-dilutive weighted-average shares related to stock award plans | 673 |  |  | 1,383 |  |  | 1,176 |  |  | 3,757 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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