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Selected Quarterly Financial Information (Tables) | 12 Months Ended
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Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract] |
Summarizes Selected Quarterly Financial Information | The following table summarizes selected quarterly financial information for 2020 and 2019:
| Quarter Ended
(Unaudited) | Dec. 31, |  | Sep. 26, |  | June 27, |  | March 28, |  | Dec. 31, |  | Sep. 28, |  | June 29, |  | March 30,
(In thousands, except for per share data) | 2020 |  | 2020 |  | 2020 |  | 2020 |  | 2019 |  | 2019 |  | 2019 |  | 2019
Sales | $ | 114,803 |  |  | $ | 106,506 |  |  | $ | 123,694 |  |  | $ | 157,584 |  |  | $ | 198,412 |  |  | $ | 177,018 |  |  | $ | 189,098 |  |  | $ | 208,174 |
Gross Profit (sales less cost of products sold) | $ | 19,118 |  |  | $ | 15,173 |  |  | $ | 26,833 |  |  | $ | 35,719 |  |  | $ | 26,908 |  |  | $ | 36,794 |  |  | $ | 40,363 |  |  | $ | 52,077 |
Impairment Loss | $ | — |  |  | $ | — |  |  | $ | 12,608 |  |  | $ | 74,408 |  |  | $ | 11,083 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
(Loss) Income Before Income Taxes | $ | (7,541) |  |  | $ | (11,141) |  |  | $ | (24,451) |  |  | $ | (69,277) |  |  | $ | (43,282) |  |  | $ | 1,760 |  |  | $ | 8,830 |  |  | $ | 100,995 |
Net (Loss) Income | $ | (19,985) |  |  | $ | (5,254) |  |  | $ | (23,579) |  |  | $ | (66,963) |  |  | $ | (34,065) |  |  | $ | 1,210 |  |  | $ | 6,726 |  |  | $ | 78,146 |
Basic (Loss) Earnings Per Share | $ | (0.65) |  |  | $ | (0.17) |  |  | $ | (0.77) |  |  | $ | (2.17) |  |  | $ | (1.10) |  |  | $ | 0.04 |  |  | $ | 0.21 |  |  | $ | 2.40 |
Diluted (Loss) Earnings Per Share | $ | (0.65) |  |  | $ | (0.17) |  |  | $ | (0.77) |  |  | $ | (2.17) |  |  | $ | (1.10) |  |  | $ | 0.04 |  |  | $ | 0.20 |  |  | $ | 2.35 |

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121640914&loc=d3e1280-108306 + Details
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