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Quarterly Results of Operations (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Information | Quarterly data for the years ended December 31, 2017 and 2016 consisted of the following (in thousands, except per share amounts):
| Quarter Ended
| March 31 |  | June 30 |  | September 30 |  | December 31
2017 |  |  |  |  |  |  |  |  |  |  |
Net sales | $ | 171,069 |  |  | $ | 186,549 |  |  | $ | 179,337 |  |  | $ | 190,897 |
Gross profit | 75,942 |  |  | 84,141 |  |  | 80,514 |  |  | 85,656 |
Income from operations | 5,609 |  |  | 13,362 |  |  | 879 |  |  | 13,219 |
Income tax expense | 690 |  |  | 1,830 |  |  | 1,364 |  |  | 4,474 |
Net income (loss) | 14,803 |  |  | 9,483 |  |  | (3,569 | ) |  | 6,806 |
Basic earnings per common share | 0.33 |  |  | 0.19 |  |  | (0.07 | ) |  | 0.14 |
Diluted earnings per common share | 0.32 |  |  | 0.19 |  |  | (0.07 | ) |  | 0.13 |
2016 |  |  |  |  |  |  |  |  |  |  |
Net sales | $ | 138,077 |  |  | $ | 151,071 |  |  | $ | 156,975 |  |  | $ | 157,715 |
Gross profit | 60,100 |  |  | 66,854 |  |  | 67,815 |  |  | 70,256 |
Income from operations | 7,706 |  |  | 11,581 |  |  | 2,987 |  |  | 12,602 |
Income tax expense (benefit) | 1,555 |  |  | 2,572 |  |  | (978 | ) |  | 2,116 |
Net income | 4,351 |  |  | 7,290 |  |  | 973 |  |  | 7,507 |
Basic earnings per common share | 0.10 |  |  | 0.16 |  |  | 0.02 |  |  | 0.17 |
Diluted earnings per common share | 0.10 |  |  | 0.16 |  |  | 0.02 |  |  | 0.17 |

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=68076893&loc=d3e1280-108306 + Details
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