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Interim Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Summary of Interim Financial Data |
|  | Three Months Ended |
|  | December 31, 2018 |  |  | September 30, 2018 |  |  | June 30, 2018 |  |  | March 31, 2018 |  |  | December 31, 2017 |  |  | September 30, 2017 |  |  | June 30, 2017 |  |  | March 31, 2017 |
|  | (In thousands, except share and per share data) |
Net sales |  | $ | 139,971 |  |  | $ | 166,380 |  |  | $ | 206,692 |  |  | $ | 171,207 |  |  | $ | 122,212 |  |  | $ | 140,194 |  |  | $ | 157,941 |  |  | $ | 144,806 |
Gross profit |  | $ | 59,856 |  |  | $ | 67,210 |  |  | $ | 91,115 |  |  | $ | 76,713 |  |  | $ | 50,906 |  |  | $ | 55,284 |  |  | $ | 72,014 |  |  | $ | 65,169 |
Net income |  | $ | 25,171 |  |  | $ | 29,471 |  |  | $ | 42,820 |  |  | $ | 37,110 |  |  | $ | 18,299 |  |  | $ | 20,098 |  |  | $ | 28,782 |  |  | $ | 27,949 |
Basic net income per share |  | $ | 0.43 |  |  | $ | 0.50 |  |  | $ | 0.73 |  |  | $ | 0.63 |  |  | $ | 0.31 |  |  | $ | 0.34 |  |  | $ | 0.49 |  |  | $ | 0.48 |
Basic weighted average common shares outstanding |  |  | 58,603,537 |  |  |  | 58,741,973 |  |  |  | 58,760,753 |  |  |  | 58,855,156 |  |  |  | 58,825,696 |  |  |  | 58,808,098 |  |  |  | 58,778,916 |  |  |  | 58,726,420 |
Diluted net income per share |  | $ | 0.43 |  |  | $ | 0.50 |  |  | $ | 0.73 |  |  | $ | 0.63 |  |  | $ | 0.31 |  |  | $ | 0.34 |  |  | $ | 0.49 |  |  | $ | 0.48 |
Diluted weighted average common shares outstanding |  |  | 58,936,795 |  |  |  | 59,084,117 |  |  |  | 59,051,413 |  |  |  | 59,199,622 |  |  |  | 59,222,258 |  |  |  | 59,156,432 |  |  |  | 59,100,836 |  |  |  | 59,122,812 |

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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=109225645&loc=d3e1280-108306 + Details
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