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Quarterly Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Data |
Schedule of quarterly financial information | The following tables set forth our quarterly results for each quarter of the years ending December 31, 2018 and 2017, in thousands, except per share amounts:
|  | 2018
|  | Q1 |  | Q2 |  | Q3 |  | Q4 |  | Total Year (a)
Net sales |  | $ | 491,444 |  | $ | 605,969 |  | $ | 647,289 |  | $ | 639,547 |  | $ | 2,384,249
Gross profit |  |  | 111,018 |  |  | 145,041 |  |  | 161,865 |  |  | 158,226 |  |  | 576,152
Operating profit |  |  | 33,893 |  |  | 43,681 |  |  | 66,217 |  |  | 65,161 |  |  | 208,953
Net income |  |  | 26,388 |  |  | 27,153 |  |  | 42,658 |  |  | 38,553 |  |  | 134,752
Basic income per common share |  | $ | 0.75 |  | $ | 0.77 |  | $ | 1.22 |  | $ | 1.12 |  | $ | 3.86
Diluted income per common share |  | $ | 0.74 |  | $ | 0.76 |  | $ | 1.19 |  | $ | 1.10 |  | $ | 3.78
|  | 2017
|  | Q1 |  | Q2 |  | Q3 |  | Q4 |  | Total Year (a)
Net sales |  | $ | 441,363 |  | $ | 474,458 |  | $ | 489,044 |  | $ | 501,401 |  | $ | 1,906,266
Gross profit |  |  | 101,628 |  |  | 116,609 |  |  | 120,839 |  |  | 122,033 |  |  | 461,109
Operating (loss) profit |  |  | (3,463) |  |  | 40,796 |  |  | 49,562 |  |  | 49,970 |  |  | 136,864
Net (loss) income |  |  | (1,710) |  |  | 23,460 |  |  | 31,393 |  |  | 104,991 |  |  | 158,133
Basic (loss) income per common share |  | $ | (0.05) |  | $ | 0.64 |  | $ | 0.90 |  | $ | 3.00 |  | $ | 4.41
Diluted (loss) income per common share |  | $ | (0.05) |  | $ | 0.63 |  | $ | 0.88 |  | $ | 2.93 |  | $ | 4.32
Due to rounding, the sum of quarterly results may not equal the total for the year. Additionally, quarterly and year-to-date computations of per share amounts are made independently.

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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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