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Earnings (Loss) Per Share (Tables) | 6 Months Ended
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Jun. 29, 2019
Schedule of computation of basic and diluted earnings (loss) per share | The following table sets forth the computation of basic and diluted earnings (loss) per share (in thousands, except per share data): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Six Months Ended
​ |  | June 29, |  | June 30, |  | June 29, |  | June 30,
​ | ​ | 2019 | ​ | 2018 | ​ | 2019 | ​ | 2018
Net income (loss) | ​ | $ | (16,029) | ​ | $ | 14,280 | ​ | $ | (10,631) | ​ | $ | 40,685
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Shares used in computing basic earnings (loss) per share | ​ | ​ | 43,386 | ​ |  | 43,312 | ​ | ​ | 43,287 | ​ |  | 43,138
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Effect of dilutive securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Stock-based awards and convertible debt | ​ | ​ | — | ​ |  | 982 | ​ | ​ | — | ​ |  | 968
Shares used in computing diluted earnings (loss) per share | ​ | ​ | 43,386 | ​ |  | 44,294 | ​ | ​ | 43,287 | ​ |  | 44,106
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Earnings (loss) per share: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Basic | ​ | $ | (0.37) | ​ | $ | 0.33 | ​ | $ | (0.25) | ​ | $ | 0.94
Diluted | ​ | $ | (0.37) | ​ | $ | 0.32 | ​ | $ | (0.25) | ​ | $ | 0.92

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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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