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Quarterly Results of Operations (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Information | Quarterly data for the years ended December 31, 2019 and 2018 consisted of the following (in thousands, except per share amounts):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Quarter Ended
​ |  | March 31 |  | June 30 |  | September 30 |  | December 31
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)
Basic earnings (loss) per common share | ​ |  | 0.11 | ​ |  | 0.12 | ​ |  | (0.06) | ​ |  | (0.08)
Diluted earnings (loss) per common share | ​ |  | 0.11 | ​ |  | 0.12 | ​ |  | (0.06) | ​ |  | (0.08)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
2018 | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Net sales | ​ | $ | 203,035 | ​ | $ | 224,810 | ​ | $ | 221,659 | ​ | $ | 233,249
Gross profit | ​ |  | 88,056 | ​ |  | 100,009 | ​ |  | 102,039 | ​ |  | 104,666
Income from operations | ​ |  | 8,781 | ​ |  | 15,114 | ​ |  | 21,061 | ​ |  | 13,661
Income tax expense | ​ |  | 1,090 | ​ |  | 624 | ​ |  | 2,766 | ​ |  | 3,022
Net income | ​ |  | 5,269 | ​ |  | 10,941 | ​ |  | 16,619 | ​ |  | 9,188
Basic earnings per common share | ​ |  | 0.10 | ​ |  | 0.22 | ​ |  | 0.31 | ​ |  | 0.17
Diluted earnings per common share | ​ |  | 0.10 | ​ |  | 0.21 | ​ |  | 0.30 | ​ |  | 0.16

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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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