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Interim Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Summary of Interim Financial Data |
|  | Three Months Ended |
|  | December 31, 2017 |  |  | September 30, 2017 |  |  | June 30, 2017 |  |  | March 31, 2017 |  |  | December 31, 2016 |  |  | September 30, 2016 |  |  | June 30, 2016 |  |  | March 31, 2016 |
|  | (In thousands, except share and per share data) |
Net sales |  | $ | 122,212 |  |  | $ | 140,194 |  |  | $ | 157,941 |  |  | $ | 144,806 |  |  | $ | 95,322 |  |  | $ | 106,168 |  |  | $ | 146,450 |  |  | $ | 131,676 |
Gross profit |  | $ | 50,906 |  |  | $ | 55,284 |  |  | $ | 72,014 |  |  | $ | 65,169 |  |  | $ | 38,113 |  |  | $ | 29,945 |  |  | $ | 61,410 |  |  | $ | 57,627 |
Net income |  | $ | 18,299 |  |  | $ | 20,098 |  |  | $ | 28,782 |  |  | $ | 27,949 |  |  | $ | 12,629 |  |  | $ | 7,787 |  |  | $ | 23,725 |  |  | $ | 23,706 |
Basic net income per share |  | $ | 0.62 |  |  | $ | 0.68 |  |  | $ | 0.98 |  |  | $ | 0.95 |  |  | $ | 0.43 |  |  | $ | 0.27 |  |  | $ | 0.81 |  |  | $ | 0.80 |
Basic weighted average common shares outstanding |  |  | 29,412,848 |  |  |  | 29,404,049 |  |  |  | 29,389,458 |  |  |  | 29,363,210 |  |  |  | 29,318,915 |  |  |  | 29,295,284 |  |  |  | 29,264,362 |  |  |  | 29,697,722 |
Diluted net income per share |  | $ | 0.62 |  |  | $ | 0.68 |  |  | $ | 0.97 |  |  | $ | 0.95 |  |  | $ | 0.43 |  |  | $ | 0.26 |  |  | $ | 0.80 |  |  | $ | 0.79 |
Diluted weighted average common shares outstanding |  |  | 29,611,129 |  |  |  | 29,578,216 |  |  |  | 29,550,418 |  |  |  | 29,561,406 |  |  |  | 29,543,842 |  |  |  | 29,516,718 |  |  |  | 29,477,870 |  |  |  | 29,910,292 |

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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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