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Summarized Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Operating Results | The following table presents unaudited quarterly operating results for each of our last eight fiscal quarters. This information has been prepared on a basis consistent with our audited financial statements and includes all adjustments, consisting only of normal recurring adjustments, considered necessary for a fair presentation of the data. Unaudited Quarterly Operating Results (In thousands, except for per share amounts)
Three Months Ended |  | March 31, 2017 |  |  | June 30, 2017 |  |  | September 30, 2017 |  |  | December 31, 2017 |
Net sales |  | $ | 170,279 |  |  | $ | 184,673 |  |  | $ | 185,112 |  |  | $ | 126,836 |
Gross profit |  | $ | 73,715 |  |  | $ | 84,632 |  |  | $ | 86,498 |  |  | $ | 58,815 |
Operating income |  | $ | 7,032 |  |  | $ | 16,448 |  |  | $ | 18,318 |  |  | $ | (4,061 | )
Net income |  | $ | 6,651 |  |  | $ | 12,401 |  |  | $ | 15,898 |  |  | $ | (11,110 | )
Earnings per common share |  | $ | 0.14 |  |  | $ | 0.26 |  |  | $ | 0.33 |  |  | $ | (0.23 | )
Earnings per common share assuming dilution (1) |  | $ | 0.14 |  |  | $ | 0.26 |  |  | $ | 0.33 |  |  | $ | (0.23 | )
Three Months Ended |  | March 31, 2016 |  |  | June 30, 2016 |  |  | September 30, 2016 |  |  | December 31, 2016 |
Net sales |  | $ | 142,204 |  |  | $ | 162,701 |  |  | $ | 168,890 |  |  | $ | 162,986 |
Gross profit |  | $ | 65,794 |  |  | $ | 78,955 |  |  | $ | 75,808 |  |  | $ | 70,787 |
Operating income |  | $ | 5,521 |  |  | $ | 14,812 |  |  | $ | 10,130 |  |  | $ | 4,272 |
Net income |  | $ | 5,014 |  |  | $ | 10,228 |  |  | $ | 12,415 |  |  | $ | 7,572 |
Earnings per common share |  | $ | 0.10 |  |  | $ | 0.21 |  |  | $ | 0.26 |  |  | $ | 0.16 |
Earnings per common share assuming dilution (1) |  | $ | 0.10 |  |  | $ | 0.21 |  |  | $ | 0.26 |  |  | $ | 0.16 |
(1) | Assumes exercise of dilutive stock options calculated under the treasury stock method.

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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=84173487&loc=d3e1280-108306 + Details
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