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Quarterly Results of Operations (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Information | Quarterly data for the years ended December 31, 2020 and 2019 consisted of the following (in thousands, except per share amounts):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Quarter Ended
​ |  | March 31 |  | June 30 |  | September 30 |  | December 31
2020 |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Net sales | ​ | $ | 243,525 | ​ | $ | 218,371 | ​ | $ | 243,975 | ​ | $ | 258,004
Gross profit | ​ |  | 103,784 | ​ |  | 84,216 | ​ |  | 102,014 | ​ |  | 111,163
Income (loss) from operations | ​ |  | 1,362 | ​ |  | (18,995) | ​ |  | 64 | ​ |  | 16,007
Income tax expense (benefit) | ​ |  | 1,162 | ​ |  | (3,242) | ​ |  | 825 | ​ |  | (2,133)
Net income (loss) | ​ |  | (3,154) | ​ |  | (19,058) | ​ |  | (3,009) | ​ |  | 15,378
Earnings (loss) per common share - basic | ​ |  | (0.06) | ​ |  | (0.34) | ​ |  | (0.05) | ​ |  | 0.28
Earnings (loss) per common share - diluted | ​ |  | (0.06) | ​ |  | (0.34) | ​ |  | (0.05) | ​ |  | 0.27
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
2019 | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Net sales | ​ | $ | 238,349 | ​ | $ | 255,532 | ​ | $ | 243,049 | ​ | $ | 257,922
Gross profit | ​ |  | 104,636 | ​ |  | 111,964 | ​ |  | 104,136 | ​ |  | 111,630
Income (loss) from operations | ​ |  | 9,523 | ​ |  | 12,201 | ​ |  | (2,881) | ​ |  | (3,409)
Income tax expense (benefit) | ​ |  | 651 | ​ |  | 2,140 | ​ |  | (2,292) | ​ |  | (3,757)
Net income (loss) | ​ |  | 6,195 | ​ |  | 6,859 | ​ |  | (3,398) | ​ |  | (4,205)
Earnings (loss) per common share - basic | ​ |  | 0.11 | ​ |  | 0.12 | ​ |  | (0.06) | ​ |  | (0.08)
Earnings (loss) per common share - diluted | ​ |  | 0.11 | ​ |  | 0.12 | ​ |  | (0.06) | ​ |  | (0.08)

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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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