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Net Income (Loss) Per Share (Tables) | 6 Months Ended
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Jun. 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 six months ended June 30, 2018 and 2017 was as follows:
| Three months ended June 30, |  | Six months ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
| (In thousands, except per share data)
Net income (loss) | $ | 6,588 |  |  | $ | 1,880 |  |  | $ | 9,308 |  |  | $ | (8,455 | )
Weighted-average shares outstanding — basic | 38,970 |  |  | 37,250 |  |  | 38,804 |  |  | 37,046 |
Effect of dilutive securities from stock award plans | 1,030 |  |  | 1,120 |  |  | 1,050 |  |  | — |
Weighted-average shares outstanding — diluted | $ | 40,000 |  |  | $ | 38,370 |  |  | 39,854 |  |  | 37,046 |
Net income (loss) per share - basic | $ | 0.17 |  |  | $ | 0.05 |  |  | $ | 0.24 |  |  | $ | (0.23 | )
Net income (loss) per share - diluted | $ | 0.16 |  |  | $ | 0.05 |  |  | $ | 0.23 |  |  | $ | (0.23 | )
Anti-dilutive weighted-average shares related to stock award plans | 1,264 |  |  | 2,121 |  |  | 1,249 |  |  | 4,039 |

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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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