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Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract] |
Summarized Quarterly Financial Data | Summarized quarterly financial data is as follows:
| 2019
(In thousands, except per share amounts) | March 31, |  | June 30, |  | September 30, |  | December 31,
Net sales | $ | 184,163 |  |  | $ | 193,896 |  |  | $ | 200,724 |  |  | $ | 174,694 |
Gross profit | 39,874 |  |  | 33,993 |  |  | 46,479 |  |  | 49,857 |
Operating income (loss) | 1,663 |  |  | (3,926 | ) |  | 6,127 |  |  | 11,451 |
Net income (loss) | (1,005 | ) |  | (5,061 | ) |  | 2,669 |  |  | 7,027 |
Earnings (loss) per share (1): |  |  |  |  |  |  |
Basic | $ | (0.07 | ) |  | $ | (0.37 | ) |  | $ | 0.19 |  |  | $ | 0.50 |
Diluted | $ | (0.07 | ) |  | $ | (0.37 | ) |  | $ | 0.19 |  |  | $ | 0.49 |
| 2018
(In thousands, except per share amounts) | March 31, |  | June 30, |  | September 30, |  | December 31,
Net sales | $ | 164,698 |  |  | $ | 162,523 |  |  | $ | 182,717 |  |  | $ | 170,303 |
Gross profit | 37,202 |  |  | 26,759 |  |  | 40,316 |  |  | 37,527 |
Operating income (loss) | 904 |  |  | (9,870 | ) |  | 4,729 |  |  | 2,572 |
Net income (loss) | (587 | ) |  | 22,659 |  |  | 959 |  |  | (11,107 | )
Earnings (loss) per share (1): |  |  |  |  |  |  |
Basic | $ | (0.04 | ) |  | $ | 1.61 |  |  | $ | 0.07 |  |  | $ | (0.80 | )
Diluted | $ | (0.04 | ) |  | $ | 1.60 |  |  | $ | 0.07 |  |  | $ | (0.80 | )
(1) | The earnings per common share calculations for each of the quarters were based upon the weighted average number of shares and share equivalents outstanding during each period, and the sum of the quarters may not be equal to the full year earnings per share amounts.

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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=118952077&loc=d3e1280-108306 + Details
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